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Without being able to give up too much information, we (my coworker and I) are trying to determine if a user account in Microsoft Server 2003 can randomly reactivate itself without any direct input from anyone else, or if there's someone with access to the server involved.
We've deactivated a certain account several times over the course of about 2 years, and it has come back as active a few times during that span. Deleting the account is currently not an open for us. Is there anything in particular I should be looking for?
10 Replies
Jun 5, 2012 at 5:02 UTC
Have there been any logins on that account when it becomes active?
Deactivate it, change the password to something random and remove all login times for that account. Then monitor the logs for logins on that account.
Best that I can think of at the moment.
Jun 5, 2012 at 5:03 UTC
If it isn't a system based account (service account) then no, an account will not spontaniously re-enable itself and requires something else to do that.
That somethine else could be another administrator or even a process/applciaiton if you have some soft of self-service account management solution in place.
To Trace the action, You can enable enable audit logging of account management activities but unless you have an active log management solution, you'll likely not see it before the event scrolls off since it sounds like this is happening at unknown times.
I do know of a freeware log management solution that may be able to help you gain some historical analytics and perhaps trace when and who is actually doing it. Check them out.
Jun 5, 2012 at 5:05 UTC
Both of those make perfect sense. We're fairly confident that it's not being reactivated from the outside, but we're also trying to treat this as a pretty high priority given the circumstances.
We'll try that and I'll report back with anything else, thanks!
Edit (to avoid clutter): any "monitoring" software would be less than ideal. If we clear the logs now, it would be something we could keep an eye on from here on out, since we thought it was just a fluke the last time it happened. We recently had some new accounting software installed, thought their program may have caused the issues, though we've since ruled that out.
Jun 5, 2012 at 5:08 UTC
There is no way an account reactivated itself. Someone with access did this. If all the people you know of with Admin access to the server swear they did not do it, then I think someone has compromised an admin account.
My suggestion is to change all the Domain and Enterprise admin passwords, then disable the account again. Also, if the server can be physically accessed by anyone other than the people who are authorized, why you have bigger problems and you should address those first.
I run all my servers as Virtual Machines on a headless host, so even physical access will avail someone nothing. You can only get to them remotely unless you bring a keyboard mouse and monitor with you.
Jun 5, 2012 at 5:09 UTC
.... Deactivate it, change the password to something random and remove all login times for that account....
And, rename the account (append ".old" or somesuch).
Could be re-activating by a script or other automagic action since forgotten in the sands of time. Erm, is the Win2k3 server have a trust, sync, or other connection which may allow such?
Jun 5, 2012 at 5:24 UTC
@slylabs13: we'll be having a sit down with our P.D. and see what they'd like us to do since the last thing we want to do is raise flags with the wrong people. Limiting physical access is one of the options we'll bring up to them.
@RoguePacket: while the server is aging, we're pretty sure there's no suspicious programs running, but we could always triple-check that.
I'll see what I can do and report back with any results. Thanks a lot, so far.
Jun 6, 2012 at 12:10 UTC
Also there may be problem with AD replication, we had opposite problem wit h account disabling several times itself just after it was enabled and it was issue with AD replication. So try to check that your DC's are replicating AD correctly.
Jun 6, 2012 at 5:47 UTC
If we clear the logs now, it would be something we could keep an eye on from here on out,
One of the best things to do. Save & clear. Make sure account management auditing is on & check periodically.
Jun 6, 2012 at 9:03 UTC
I'd be on this like stink on the south end of a northbound skunk. You have, at minimum a protocol breach and at worst, well let's not go there just yet.
I would immediately:
Verify permissions on the OU that the user is in, then verify at every juncture back to the Root who has management permissions.
Then I would inspect the membership of Enterprise and Domain Admins and any associated groups.
Someone, somewhere is re-enabling this account. As Martin 1976 said above, there is a minute chance that if you're having replication issues it could result in the account being re-enabled...but man o man I would NOT bet on that.
Jump all over this dude.
May I ask, why can't you simply delete the account? What groups or rights does this account have?
Jun 6, 2012 at 10:50 UTC
Ideally, we'd unplug the server and go through it with a fine-tooth comb many times over. Unfortunately, with the way certain things work here, we have our hands tied with how much we're able to do at certain times.
As far as deleting the account, our top admin says don't do it... we don't. Maybe they knew this would happen again? I don't know. But it's still something we're going to look into ASAP.
This discussion has been inactive for over a year.
You may get a better answer to your question by starting a new discussion.

subset: commoncrawl


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Proud to Introduce the New Austads.com
Thursday, March 12, 2015 9:39:08 PM America/North_Dakota/Center
If you're here reading this, you're already well aware that the new Austads.com is officially live. Taking control of our online presence again is a big step for us and we couldn't be more excited for the opportunity to connect with customers in a whole new way. Our goal is to provide you with an online experience that will not only impress, but will make you want to come back for more day after day.
Design Principles
Our new website has been designed from the ground-up to be a more interesting, fun and enjoyable shopping experience. One of the things that we found when we looked at our competitor's websites (and believe me, we looked!) is that while most of the sites are beautifully designed and offer a pretty slick shopping experience, they were missing one key ingredient: fun.
When we surveyed existing golf websites, we saw a lot of great product, some very nice looking vendor banners, but could count on one hand the number of images of golf courses or people actually playing golf. At Austad's, we love the game as much as you do, and that's why on Austads.com, you'll see pictures of our family and staff bombing drives and celebrating great putts. As much as we want to sell you your next driver or iron set, we also want you to find time to enjoy the sport as much as we do.
New Features
We've got a host of new features to make your online shopping experience amazing. These are just a few of the reasons why we think you're going to want to make Austads.com your primary golf shopping destination:
Great Products from the Best Brands in Golf - Austad's Golf is an authorized golf partner of every major brand in golf. What does that mean? It means that when you buy from Austad's, you can rest assured that you're getting an authentic product from a brand that you love and that Austad's will stand by the quality and performance of that product...no matter what.
New Store Locator & Custom Fitter Profiles - Not to brag, but the custom fitting experience at an Austad's store is like nowhere else. Every staff member is a Certified Custom Club fitter for every major brand and our ultimate goal is to find you the right equipment to help you play better and have more fun on the course. Every store page highlights our top custom club fitters so that you know exactly who you'll be working with when you walk through the door.
One Page Checkout - We've chosen to implement some pretty slick technology to make your checkout process as quick and painless as possible. Less time in the checkout means golf equipment arriving at your door a whole lot faster.
Shareable Wish Lists - Whether you've got a birthday coming up, you're trying to give some gentle hints for Mother's or Father's Day or just want to keep track of your dream set, our Wishlist functionality allows you to create an online list of everything you've been dreaming about.
Killer Deals on Killer Products - The selection of products at Austads.com is unlike anything you'll find on other golf websites. We'll always carry the top clubs and equipment from top manufacturers, but we also specifically curate our product assortment to give you access to great closeout deals, unique golf products and brands that you won't see everywhere else.
We hope you'll enjoy shopping our new website as much as we've enjoyed creating it. In the coming months, we'll continue to improve and build out the experience here, so stop back often and don't forget to enter our $10,000 Grand Opening Sweepstakes!
Thanks for your support and remember to Have Fun, Play Better and Shop Austad's!
- Dave Austad


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Religion & Spirituality, Science & Medicine, Social Sciences, Society & Culture, PhilosophyFollow
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Point of Inquiry is the Center for Inquiry's flagship podcast, where the brightest minds of our time sound off on all the things you're not supposed to talk about at the dinner table: science, religion, and politics. Guests have included Brian Greene, Susan Jacoby, Richard Dawkins, Ann Druyan, Neil deGrasse Tyson, Eugenie Scott, Adam Savage, Bill Nye, and Francis Collins. Point of Inquiry is produced at the Center for Inquiry in Amherst, N.Y.
August 7th, 2012
Episode 343 of 570 episodes
Host: Chris Mooney Our guest this week is Peter Montgomery, senior fellow with People for the American Way and author of a new report entitledTwelve Rules for Mixing Religion and Politics, released last week with a new introduction by Bill Moyers. Point of Inquiry invited Montgomery on the show to discuss these very useful rules of the road, but also to ask a key question: Will the religious right ever consent to follow them? Peter Montgomery oversees the People For the American Way Foundation's research and writing on the Religious Right. Before joining the group in 1994, he was associate director of grassroots lobbying for Common Cause, and also wrote and edited for Common Cause Magazine, an award-winning journal featuring investigative reporting about the federal government.
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Department of Physiology and Biophysics, The University of Alabama at Birmingham, nd Avenue South, Birmingham, AL 35294, USA
- Blanche Carpenter
- 2 years ago
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1 International Journal of Breast Cancer Volume 202, Article ID , 2 pages doi:0.55/202/ Research Article Preclinical Evaluation of Oncolytic Δγ 34.5 Herpes Simplex Virus Expressing Interleukin-2 for Therapy of Breast Cancer Brain Metastases James J. Cody, Pietro Scaturro, 2 Alan B. Cantor, 3 G. Yancey Gillespie, 2, 4, 5 Jacqueline N. Parker, and James M. Markert, 2, 5, 6 Division of Infectious Diseases, Department of Pediatrics, The University of Alabama at Birmingham, 720 2nd Avenue South, Birmingham, AL 35294, USA 2 Division of Neurosurgery, Department of Surgery, The University of Alabama at Birmingham, 720 2nd Avenue South, Birmingham, AL 35294, USA 3 Division of Preventive Medicine, Department of Medicine, The University of Alabama at Birmingham, 720 2nd Avenue South, Birmingham, AL 35294, USA 4 Department of Microbiology, The University of Alabama at Birmingham, 720 2nd Avenue South, Birmingham, AL 35294, USA 5 Department of Cell Biology, The University of Alabama at Birmingham, 720 2nd Avenue South, Birmingham, AL 35294, USA 6 Department of Physiology and Biophysics, The University of Alabama at Birmingham, 720 2nd Avenue South, Birmingham, AL 35294, USA Correspondenceshouldbe addressedtojames J. and James M. Markert, Received 22 July 202; Revised 22 November 202; Accepted 22 November 202 Academic Editor: Filippo Montemurro Copyright 202 James J. Cody et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The metastasis of breast cancer to the brain and central nervous system (CNS) is a problem of increasing importance. As improving treatments continue to extend patient survival, the incidence of CNS metastases from breast cancer is on the rise. New treatments are needed, as current treatments are limited by deleterious side effects and are generally palliative. We have previously described an oncolytic herpes simplex virus (HSV), designated, which lacks both copies of the γ 34.5neurovirulencegeneandcarries a murine interleukin 2 (IL-2) expression cassette, and have validated its antitumor efficacy in a variety of preclinical models of primary brain tumors. However, has not been yet evaluated for use against metastatic brain tumors. Here, we demonstrate the following: both human breast cancer and murine mammary carcinoma cells support viral replication and IL-2 expression from ; replicates in and destroys breast cancer cells from a variety of histological subtypes, including triple-negative and HER2 overexpressing; improves survival in an immunocompetent model more effectively than does a non-cytokine control virus. Thus, we conclude from this proof-of-principle study that a γ 34.5-deleted IL-2 expressing oncolytic HSV may be a potential new therapy for breast cancer brain metastases.. Introduction Breast cancer, the most prevalent cancer among women, afflicts approximately one in eight over a lifetime. Current treatment strategies may yield cures, if applied early, but are less effective against metastatic disease, which accounts for most deaths. Between 5% and 20% of breast cancer patients are eventually diagnosed with intracranial metastases, with autopsy data suggesting that 30% or more may actually bear these lesions [, 2]. As treatments improve for noncranial metastases, the frequency of brain metastases is increasing. For example, much therapeutic success has been achieved with the agent Herceptin, the monoclonal antibody targeting human epidermal growth factor receptor 2 (HER2) [3, 4]. However, Herceptin and commonly used chemotherapeutics do not cross the blood-brain barrier [5, 6] at therapeutically effective levels, thus maintaining the brain as a sanctuary site in which tumor cells are inaccessible to systemically
2 2 International Journal of Breast Cancer administered therapies [6]. As a result, patients with controlled systemic disease are increasingly succumbing to the neurological complications of central nervous system (CNS) metastases. The established treatments for metastases in the brain are generally palliative [7, 8], and overall survival of patients following this diagnosis is rarely more than one year [2]. Surgery can be efficacious against solitary lesions, but patients typically present with multiple lesions that can make this approach impractical, and tumor recurrence is frequent. Radiotherapy and radiosurgery therapies have also been used for the treatment of brain metastases with modest success, but both of these approaches have limitations, including the possibility of undesirable side effects [9] that accentuate the neurotoxicities of chemo-brain [0] as well as an inability to treat effectively patients that have more widespread intracranial disease. It is clear that new innovative treatments are needed to combat intracranial metastases of breast cancer. Immunotherapy is a relatively new approach to breast cancer treatment. Though breast cancers express a variety of potential tumor antigens, a given tumor may express only one of these or none at all. Furthermore, because of their heterogeneous nature, a tumor may escape immunotherapy based on a single antigen. Thus, it is unlikely that vaccines directed at single peptides will be universally successful. In contrast, cytokine-based immunotherapy has the potential to stimulate patient tumor-specific immune responses. Immunotherapy approaches have been attempted in patients with brain tumors but have thus far been limited by ineffectual systemic immunization, use of allogeneic antigens, or the inability of sufficient numbers of activated effector cells to penetrate inherent defense mechanisms of the CNS. Another novel anticancer strategy is the use of oncolytic virotherapy. Oncolytic viruses, including those that are naturally occurring (e.g., reovirus) and those that can be readily genetically engineered (herpes simplex virus, adenovirus), are viruses that are able to infect, replicate in, and lyse tumor cells, with subsequent spread to neighboring cells [20]. In theory, oncolytic viruses have the potential to eliminate entire tumors. Preclinical studies have demonstrated that oncolytic viruses can infect and lyse a variety of malignancies, including breast cancer, and their safety has been shown in clinical trials. At least three different oncolytic viruses have demonstrated the potential for efficacy in models of breast cancer brain metastasis, including reovirus [2], poliovirus [22], and G207, a genetically modified, conditionally replication-competent herpes simplex virus (HSV) [23], establishing the feasibility of this approach. However, antitumor efficacy of an oncolytic virus depends in part upon the extent of tumor cell transduction following the initial administration. Tumors are composed of both malignant and nonmalignant cells and include extracellular matrix barriers that can limit intratumoral spread and ultimately the effectiveness of these agents [24]. Given this background, we propose a strategy that combines both of the above approaches. In this scenario, the oncolytic effect of viral replication enhances immunotherapy by reducing tumor burden and releasing potential tumor antigens; likewise, immunotherapy enhances virotherapy by the activation of an immune response against uninfected tumor cells. We have previously described a cytokineexpressing HSV, which contains deletions of both copies of the HSV neurovirulence gene γ 34.5 [25]. This virus, designated, does not replicate in normal cells but efficiently kills tumor cells. HSV also carries an inserted gene for murine interleukin-2 (IL-2), a proinflammatory cytokine with additional antiangiogenic properties [26, 27]. Production of IL-2 thus extends the antitumor activity of to uninfected cells. We have previously shown that can induce an antitumor immune response and significantly enhance survival in murine models of primary brain tumors [25, 28, 29]. However, this virus has not been previously evaluated as a therapy for breast cancer. Our presumption is that the antitumor activity of is not exclusive to primary brain tumors, and that it will be effective against tumors originating from other tissues, including breast cancer. This presumption is supported by both the observation that other described oncolytic viruses have demonstrated activity against multiple tumor types, and by the results of our preliminary experiments utilizing multiple tumor cell lines. To test the hypothesis that this IL-2-expressing oncolytic HSV might be suitable for use against breast cancer lesions metastatic to the CNS, we assessed both human breast cancer and murine mammary carcinoma cell lines for levels of viral IL-2 production, susceptibility to viral infection and oncolysis, and viral spread over time. Additionally, an immunocompetent in vivo model was developed, and therapeutic efficacy in this model was examined. The results of these experiments are as follows: (i) both human breast cancer and murine mammary carcinoma cells efficiently produce IL-2 when infected with ; (ii) replicates robustly in a panel of breast cancer cells representative of brain metastases and mediates a directly cytotoxic effect in both human and murine cells; (iii) the intracranial injection of SCK cells can be used as an appropriate and reliable immunocompetent model for breast cancer brain metastases; (iv) extends the survival of treated mice more effectively than does a non-cytokine control virus or mock treatment. Collectively, these results suggest that an IL-2-expressing γ 34.5-deleted HSV may be an effective therapy against breast cancer brain metastases and provide the rationale for further testing. 2. Materials and Methods 2.. Cells. Vero cells were obtained from the American Type Culture Collection (ATCC, Rockville, MD, USA) and were cultured in Minimal Essential Medium (MEM; Cellgro, Mediatech Inc., Herndon, VA, USA) containing 7% heatinactivated fetal bovine serum (FBS; Hyclone, Logan, UT, USA). The 4T murine mammary carcinoma cell line (derived from BALB/c mice) was purchased from the ATCC. The SCK murine cell line was isolated from a spontaneous mammary carcinoma in a female A/J mouse and was provided by Dr. C. W. Song (University of Minnesota Medical School, Minneapolis, MN, USA) [30].
3 International Journal of Breast Cancer 3 Both lines were maintained in RPMI containing 0% FBS. The human breast cancer cell lines MDA-MB-36, MDA- MB-23, ZR-75-, SK-BR-3, and BT-474 were obtained from ATCC and maintained in a 50 : 50 mixture of Dulbecco s modified Eagle medium and Ham s nutrient mixture F-2 (DMEM/F2) supplemented with 2.6 mm L-glutamine and 0% FBS. BT-474 cells are derived from a solid invasive ductal carcinoma; they are epithelial in morphology and establish nodules in nude mice []. MDA-MB-23 is an adenocarcinoma cell line obtained from a pleural effusion [5, 3]. MDA-MB-36 are adenocarcinoma cells derived from a brain metastasis [5, 3] that establish slow-growing intracranial tumors in mice when delivered by intracarotid injection [32]. SK-BR-3 is an adenocarcinoma cell line [8]. ZR-75- are derived from an ascitic effusion, from a patient with invasive ductal carcinoma [9]. All cells were maintained in Corning tissue culture plasticware Viruses. The HSV- (F) strain, which was used as a prototype for all mutant HSVs in these studies, is a low passage clinical isolate that has been previously described [33, 34]. R3659 is a γ 34.5-deleted virus that has also been described previously and was used as a control [35]. is a γ 34.5-deleted oncolytic HSV that carries two copies of a murine IL-2 (mil-2) expression cassette under the transcriptional control of the murine early growth response- (EGR-) promoter and has been described previously [25] Cytokine Expression. 4T, SCK, and MDA-MB-36 cells were seeded in 6-well plates at cells/well and then infected with at a multiplicity of infection (MOI) of plaque-forming unit (PFU) per cell. After 24, 48, and 72 h, supernates were harvested. The concentration of IL-2 in the samples was then assessed using an enzyme-linked immunosorbent assay (ELISA) kit specific for the p70 subunit of murine IL-2 (R & D Systems, Minneapolis, MN, USA). Plates were read with an EL x 808 Ultra Microplate Reader (Bio-Tek Instruments Inc., Winooski, VT, USA) Viral Replication. Both single-step and multistep viral replication assays were performed as previously described [36]. To assess viral replication efficiency in a single-step replication assay, a panel of breast cancer cells (MDA-MB- 36, MDA-MB-23, ZR-75-, BT-474, and SK-BR-3) were seeded in 6-well plates and then infected with HSV- (F), R3659, or at an MOI of 5 PFU per cell. After 48 hours, bright-field photomicrographs (00x magnification) were taken, and the cells were then harvested and subjected to three rounds of freeze/thawing followed by sonication. Supernates were then serially diluted and titered on monolayers of Vero cells. To assess the efficiency of viral replication and spread over time, monolayers of Vero, MDA-MB-36, SCK, or 4T cells were infected with HSV- (F),, or R3659 at an MOI of 0. PFU/cell. Cells were harvested at regular intervals (2, 24, 48, 72, and 96 h post-infection), and viral progeny were titered as above Oncolytic Potency. The oncolytic potency of on breast cancer cells was assessed as follows. Human MDA- MB-36 breast cancer or murine SCK and 4T mammary carcinoma cells were seeded in 96-well plates and then infected with HSV- (F) or at MOIs of and 0 PFU/cell. At regular intervals post-infection (24, 48, 72, and 96 h), cell viability was assessed by 3-[4,5-dimethylthiazol-2- yl]-2,5-diphenyl tetrazolium bromide (MTT) assay (Sigma, St. Louis, MO, USA), in accordance with the manufacturer s specifications. The plates were read with an EL x 808 Ultra microplate reader (Bio-Tek Instruments Inc.) at 570 nm (690 nm background) Tumor Survival Studies. All animal experimental protocols were carefully reviewed and approved by the University of Alabama at Birmingham (UAB) Institutional Animal Care and Use Committee, which has maintained accreditation with the Association for Assessment and Accreditation of Laboratory Animal Care International (AAALAC) since 97. UAB is a United States Department of Agriculture- (USDA-) licensed animal research facility and an Animal Welfare Assurance is on file with the Office of Laboratory Animal Welfare. Thus, all protocols were in accordance with USDA Animal Welfare Regulations, as well as the Public Health Service Policy on the Humane Care and Use of Laboratory Animals and the National Research Council Guide for the Care and Use of Laboratory Animals. The intracranial injection of tumor cells has been detailed previously [37] and is briefly summarized here. Female A/J mice, 4 6 weeks old, were obtained from the National Cancer Institute-Frederick (Frederick, MD, USA) and allowed at least one week for acclimation prior to beginning the experiments. For the establishment of intracranial tumors, SCK cells were harvested with trypsin, washed, and then resuspended in 5% methylcellulose in MEM at two concentrations: and 0 7 cells/ml. The cells were loaded into a 250μL Hamilton syringe and kept on ice. The mice were weighed, anesthetized with an intraperitoneal (IP) injection of a ketamine (0 mg/ 00 g)/xylazine (.5 mg/00 g) mixture, and the surgical site was prepared. Eight mice in two cohorts (n = 4, each) were then stereotactically injected in the right caudate nucleus [36, 38] with 0 4 or cells/5 μl, respectively, and the mice were monitored for survival. By days six (5 0 4 cohort) and nine ( 0 4 ) post-injection, all mice in each cohort had been euthanized due to the onset of neurological symptoms, in accordance with institutional guidelines. The brains were fixed in formalin and paraffin embedded,and sections of tissue 0 μm thick were stained with hematoxylin and eosin for histological analysis. For treatment experiments, SCK cells were prepared at cells/ml, and then in 5 μl werestereotactically injected as above. Four days later, or R3659 (n = 0 each; PFU in 0 μl) or vehicle only (n = 9; sterile saline) was injected at the same coordinates (intratumoral), and the mice were monitored for survival. In all survival experiments, a log-rank comparison of Kaplan- Meier plots calculated for each group was conducted on a pairwise basis.
4 4 International Journal of Breast Cancer Table : Key features of the human breast cancer cell lines used in this study. Some lines can be classified into more than one subtype. Expression of ER and PR and amplification/overexpression of HER2 are indicated (+). Cell line Cancer type Molecular subtype Age of donor Site of isolation Receptor status ER PR HER2 References BT-474 IDC Luminal A/B 60 Primary tumor + + [ 4] MDA-MB-36 AC Luminal A 40 Brain [2, 3, 5 7] MDA-MB-23 AC Basal 5 Pleural effusion [3 7] SK-BR-3 AC Luminal B/HER2 43 Pleural effusion + [2 4, 8] ZR-75- DC Luminal A 63 Ascites [2 4, 9] AC: adenocarcinoma, DC: ductal carcinoma, ER: estrogen receptor, HER2: human epidermal growth factor receptor 2, IDC: invasive ductal carcinoma, and PR: progesterone receptor. 3. Results 3.. Breast Cancer Cells Infected with Produce IL-2. Prior to beginning in vivo studies, verification of IL-2 transgene expression at physiologically relevant levels from breast cancer cells infected with was necessary. To this end, the breast cancer cell line MDA-MB-36, originally isolated from a brain metastasis, was selected as a representative human line for study. In addition, two murine mammary carcinoma cell lines (SCK and 4T) were also assayed, as these cells are syngeneic with two of the immunocompetent murine models used in our laboratory (A/J and BALB/c, resp.,). The cells were seeded in 6-well tissue culture plates and then infected with at a multiplicity of infection (MOI) of both 0. and plaque-forming units (PFU) per cell. At regular intervals post-infection (24 h, 48 h, and 72 h) cultured medium samples were harvested and then subjected to an enzyme-linked immunosorbent assay (ELISA) specific for the p70 subunit of murine IL-2. For all three lines, little to no endogenous IL-2 production was detected from uninfected cells. In contrast, infected cells yielded a high level of IL-2 production across all three time points, with a slight trend towards maximum production at 48 h (Figure ). Amounts of IL-2 ranged from approximately 00 pg/ml to greater than 000 pg/ml, with higher levels obtained from the murine lines. For both SCK and 4T cells, infection at an MOI of yielded approximately 0-fold more IL-2 than infection at an MOI of 0.. For the MDA-MB-36 cells, the level of IL-2 expression was similar at both MOIs tested (, 0.). Overall, these data confirm that both human breast cancer and murine mammary carcinoma cells support IL-2 production following infection with Replicates in Both Human Breast Cancer Cells and Murine Mammary Carcinoma Cells. A number of studies on breast cancer patients have determined that the following factors are associated with increased risk for brain metastasis (reviewed here [39, 40]): younger age, premenopausal status, invasive ductal carcinoma (IDC) histological type, estrogen receptor negative (ER ), p53 mutations, and EGFR overexpression. Additionally, there are strong associations with both HER2 overexpressing and triple negative (ER,progesterone receptor-negative, HER2 )tumortypesandbrain metastasis [4, 42]. To evaluate whether displayed oncolytic activity against breast cancer brain metastases, viral replication was assessed in vitro in a panel of human breast cancer cell lines representative of some of the aforementioned characteristics (Table ). In a single-step replication assay, cells were plated as above and then infected with at an MOI of 5 PFU per cell. At 48 h post-infection, photomicrographs were taken, and cells and media were then harvested and subjected to three rounds of freeze/thawing and sonication. Serial dilutions of the lysates were then titered on monolayers of the permissive Vero cell line. As shown in Figure 2, all cell lines displayed marked cytopathic effect and yielded robust progeny virus production. In most lines, the replication of was similar to that of wild-type HSV- (F) and was within -2 orders of magnitude of the levels reached in the control Vero cells. This result confirms that γ 34.5-deleted HSVs such as are able to replicate efficiently within these breast cancer cell lines. To further analyze viral replication, a multistep replication assay was employed to assess the efficiency of viral spread. In this experiment, replication in MDA-MB-36 cells wascomparedtothatinsckand4t,aswellasverocells as a control. Cells were infected at an MOI of 0., and then progeny virions were titered as above at 2, 24, 48, 72, and 96 h post-infection. Overall, robust replication was observed in all cell lines, with the progeny titers increasing rapidly from 2 to 48 h and then declining somewhat by 96 h (Figure 3). Maximum titers were reached at 48 h postinfection in all cell lines. It was observed that viral replication in the MDA-MB-36 cells was within one log of that seen in the Vero cells, indicating that these cells are also highly permissive for HSV replication. A similar level of replication was seen in the SCK cells. In contrast, the 4T cells were more resistant to replication, with the maximum titer of progeny less than the other lines by more than one log at 48 h post-infection. This relative resistance of the 4T line to HSV replication has been reported by others [43] Exhibits Oncolytic Potency in Breast Cancer Cells. The oncolytic potential of in breast cancer cells was assessed as follows. Both human (MDA-MB-36) and murine (SCK, 4T) cancer cells or Vero control cells were seeded in multiwell plates and then infected with wild-type HSV- (F) or with using MOIs of and 0. Cell viability was assessed by MTT assay at multiple time points. In the control permissive cells (Vero; not shown), infection with or HSV- (F) wild-type strain reduced cell viability to
5 International Journal of Breast Cancer MDA-MB SCK IL-2 (pg/ml) 00 0 IL-2 (pg/ml) MOI MOI 0. MOI MOI 0. (a) (b) T 000 IL-2 (pg/ml) 00 0 MOI MOI h 48 h 72 h (c) Figure : IL-2 production from breast cancer cells infected with human breast cancer cells (MDA-MB-36) or murine mammary carcinoma cells (SCK, 4T) were infected with at an MOI of or 0. PFU/cell. At 24, 48, and 72 h post-infection, media were harvested and subjected to an ELISA specific for the p70 subunit of murine IL-2. No IL-2 was detected from uninfected cells. approximately 30% relative to uninfected cells by 24 h, and that effect persisted through 96 h. In the MDA-MB-36 cells, viability was less affected at 24h, but for both viruses, cell viability was reduced by greater than 50% at 48 h (Figure 4) and declined further by 96 h to approximately 20%. In contrast, the SCK cells exhibited little reduction in viability by 48 h, although viability declined to less than 20% in - infected wells by 96 h. In accordance with our replication data, the 4T cells were less susceptible to HSV-mediated cytotoxicity. Viability was reduced only approximately 30% (MOI = 0) by either virus at h and did not decrease further by 96 h. Overall, these results mirrored those of the replication experiments, and indicate that infection with is directly cytotoxic to breast cancer cells Treatment with Prolongs Survival in a Novel Model of Breast Cancer Brain Metastases. Having established that breast cancer cells support IL-2 production from, viral replication, and are susceptible to -mediated cell death, we next evaluated the potential for as a therapy for breast cancer brain metastases in a preclinical model. has demonstrated efficacy against primary brain tumors in a number of preclinical models [25, 28, 29, 44, 45], but it has not yet been tested against metastatic brain tumors. Existing models of breast cancer brain metastasis typically involve the use of genetically modified or in vivo passaged human cell lines inoculated into immunodeficient mice [46, 47]. Because expresses murine IL-2, a maximum antitumor effect is achieved only in the context of an intact immune system. For this reason, we decided to examine the effectiveness of in an immunocompetent murine model. The A/J mouse strain has been previously used by us to evaluate in models of neuroblastoma [25, 29, 44] and is particularly useful from a safety standpoint due to the sensitivity of A/J mice to wild-type HSV replication. Moreover, the SCK cells were more similar to the human cell lines in terms of permissiveness for replication and cell death. To model brain metastases, SCK cells were injected into the brains of mice at two different doses ( 0 4, n = 4; 5 0 4, n = 4), and the mice were monitored for survival. We observed rapid intracranial tumor growth in vivo, requiring the euthanization of the mice given the higher dose by 6 days post-injection and those given the lower dose by 9 days post-injection. Brains of the mice were harvested and
6 6 International Journal of Breast Cancer SK-BR-3 BT-474 MDA-MB-23 MDA-MB-36 Uninf. Vero Uninf. ZR-75- (a) (PFU/mL) Vero M36 BT474 SKBR M23 ZR75 HSV R3659 (b) Figure 2: A panel of cell lines including permissive Vero cells and 5 human breast cancer cell lines, MDA-MB-36 (M36), BT-474, SK-BR-3 (SKBR), MDA-MB-23 (M23), and ZR-75- (ZR75) were infected with at an MOI of 5 PFU/cell. (a) Bright-field photomicrographs (00x magnification) of viral cytopathic effect mediated by in the infected cells shown in comparison with healthy uninfected cells. The cytopathic effect mediated by HSV- (F) and R3659 (not shown) were identical to. (b) Replication of wild-type HSV- (F), IL2-expressing HSV, or the non-cytokine-expressing control virus R3659 in a panel of human breast cancer cells at 48 h post-infection. Shown are the averages and standard deviations of duplicate determinations, from a representative of three experiments.
7 International Journal of Breast Cancer 7 E+08 E + 08 E+07 E + 07 E+06 E + 06 PFU/mL E+05 E+04 E+03 PFU/mL E + 05 E +04 E +03 E+02 E +02 E+0 E +0 E Hours post-infection E Hours post-infection (a) (b) E + 08 E+08 E + 07 E+07 E + 06 E+06 PFU/mL E + 05 E +04 E +03 PFU/mL E+05 E+04 E+03 E +02 E+02 E +0 E+0 E Hours post-infection E Hours post-infection HSV R3659 HSV R3659 (c) (d) Figure 3: Replication of over time. In a multistep replication assay, HSV replication was assayed in the following lines: the permissive Vero cell line (a), human breast cancer MDA-MB-36 (b), and murine mammary carcinoma lines SCK (c) and 4T (d). Cells were infected with HSV- (F) (triangles), R3659 (diamonds), and (boxes) at an MOI of 0. PFU/cell. At multiple time points, cells and media were harvested, and viral replication was assayed by titration on Vero cell monolayers. examined histologically. As shown in Figure 5, the tumors were relatively well circumscribed in general. The establishment of distant tumor nests, particularly in the ventricles, was frequently noted. These nests tended to be somewhat more invasive into the brain parenchyma than were the main tumors. These tumors were associated with hemorrhages, suggesting leakiness of the tumor vasculature. Having established an immunocompetent, intracranial model of breast cancer brain metastasis, we then employed this model in an evaluation of efficacy in vivo. Intracranial tumors of SCK cells were established in A/J mice as previously, although a lower dose was used ( ). After four days, tumors were injected with PFU of either (n = 0) or R3659 (n = 0), or with sterile saline only (n = 9) as a control. The mice were then monitored for neurological symptoms, at which point they were euthanized. Mice given saline only exhibited a median survival of 0 days (Figure 6). By log-rank analysis, both R3659- and -treated treated mice survived significantly longer than mock-treated mice, with median survival times of 2 days (R3659, P = ) and 3.5 (, P = 0.002) days. Additionally, the -treated mice survived longer than the R3659-treated mice (P = ). Two mice treated with survived for 6 days, or 60% longer than the median survival exhibited by the mock-treated mice. These results demonstrate in a proof-of-principle experiment that treatment can prolong survival in an immunocompetent model of breast cancer brain metastases. 4. Discussion In this paper, we present proof-of-principle data supporting the use of an IL-2-expressing oncolytic HSV as a novel treatment for breast cancer brain metastases. We have demonstrated a number of key points. First, we have confirmed in both human breast cancer and murine mammary
8 8 International Journal of Breast Cancer Proportion viable cells Proportion viable cells HSV-F 0 HSV-F (a) (b) 0.8 Proportion viable cells HSV-F 0 (c) Figure 4: Cytotoxicity of in human and murine tumor cells at 48 h post-infection. Plates of human breast cancer cells MDA-MB-36 (a) or murine mammary carcinoma cells SCK (b), and 4T (c) were infected with the indicated viruses at an MOI of (black bars) or 0 (gray bars) PFU/cell. At 48 h post-infection, cell viability was assayed by MTT assay. Shown are the averages of quadruplicate determinations, normalized to uninfected cells and expressed as the proportion viable cells. carcinoma cells that infection with produces IL-2 at physiological levels. Next, we have shown that a variety of breast cancer cell lines support the robust replication of γ 34.5-deleted viruses such as, although the replication is more limited in the murine tumor cells examined. We have also demonstrated that these viruses mediate a direct cytotoxic effect on breast cancer cells. Finally, we have described an immunocompetent model of breast cancer brain metastases and shown that improves the survival of treated animals to a greater extent than does a replicating, non-il-2-expressing control virus in this model. We observed robust IL-2 production, as measured by ELISA, in all three of the cell lines assayed. The levels obtained from the murine cells (SCK, 4T) were, in general, 0-fold higher than those obtained from the human MDA- MB-36 cells. We speculate that this may have been the result of cell death in the human cells, as this line was more susceptible to replication than were the murine lines.
9 International Journal of Breast Cancer 9 (a) (b) (a) (b) Figure 5: Development of an immunocompetent intracranial model of breast cancer brain metastases. Female A/J mice in two cohorts (n = 4, each) were given intracranial injections of 0 4 or cells/5 μl. By days six (5 0 4 cohort) and nine ( 0 4 )postinjection, all mice in each cohort had been euthanized due to the onset of neurological symptoms. Brains were harvested for histological examination. Shown are hematoxylin and eosin-stained sections from a representative specimen. Note the massive tumor at the injection site in the first panel (40x magnification) with associated hemorrhaging. Insets (400x) show the relatively well circumscribed border of the main tumor (a) and the more invasive character of a distant tumor nest (b). 00 Survival of A/J mice with intracranial SCK tumors Proportion surviving MST Saline: 0 d R3659: 2 d : 3.5 d Survival, days post-injection Saline R3659 Figure 6: Kaplan-Meier plots of antitumor effect of in vivo against intracranial SCK tumors. Tumors were treated four days after establishment with PFU of R3659 or, or were given saline only as a control. By log-rank analysis, both R3659-(P = ) and -treated mice (P = 0.002) survived significantly longer than mock-treated mice, and -treated mice survived longer than R3659-treated mice (P = ). Median survival times (MSTs) are indicated. Rapid oncolysis of the MDA-MB-36 cells may therefore have precluded high levels of IL-2 production. Alternatively, the EGR- promoter used to drive expression of the IL-2 transgene may have higher activity in the murine lines versus the human line, as our informal observations suggest that the SCK and 4T lines proliferate more rapidly than does the MDA-MB-36 line. Nonetheless, we have confirmed that breast cancer cells support IL-2 production from. The amount of IL-2 that we observed was similar to those in previously published studies of in neuroblastoma [25] and glioma [28] celllines. We have also shown robust viral replication of the γ deleted virus in a panel of human breast cancer cell lines. This panel was chosen to represent some of the key risk factors associated with brain metastases, such as younger age, invasive ductal carcinoma type, HER2 overexpression, and triple negative receptor status. Moreover, with the exception of normal like, each of the major molecular breast cancer subtypes was represented in these studies. Although the results obtained in an individual cell line may not necessarily be reflective of an entire subtype, we did not observe any correlation between replication efficiency and subtype, suggesting that may be effective against a range of breast cancer types, and that brain metastases are not likely to be resistant to oncolytic HSV replication. It is of note that in each of the single-step replication experiments
10 0 International Journal of Breast Cancer that were performed, the MDA-MB-23 line consistently yielded among the highest titers, suggesting that basallike/triple-negative breast cancers, which are particularly resistant to established therapies, are relatively permissive for oncolytic HSV replication. In the course of these studies, we have developed a reliable, reproducible, and facile model of breast cancer brain metastasis. The establishment of brain tumors by direct injection of SCK cells into the brains of mice has, to our knowledge, not been previously reported. The seeding of brain metastases from a primary tumor remains an ideal model, as this would be more physiologically relevant with respect to tumor distribution and would recapitulate all of the steps of the metastatic cascade. However, practical considerations limited the feasibility of this approach. SCK tumors are reported to be metastatic in vivo, but their propensity for establishing brain metastases has not been characterized. Also, given the current limitations of systemic delivery of oncolytic viruses, direct intracranial implantation of tumor cells remains a facile and reliable approach to generate tumors at known locations in the brain for evaluating oncolytic viruses in situ. Moreover, this approach is independent of the potentially confounding variables involved with intravascular virus delivery, such as complement binding, neutralizing antibody response, or nonspecific sequestration of virus in nontarget tissues. Nonetheless, breast cancer brain metastases typically present as a discrete number of lesions ( 5) with well-circumscribed borders, which are accessible surgically [48] or provide unambiguous stereotactic radiosurgery targets [49], and therefore the potential for direct intratumoral inoculation in the clinical setting exists. In a treatment experiment, we have shown that a single injection of extended the survival of treated mice over that of mock-treated mice, and did so more effectively than a non-cytokine control virus. This finding is in agreement with our earlier studies of primary brain tumors and is particularly noteworthy considering the aggressiveness of the model. Although treatment with extended the survival of the mice, the single dose used here was not sufficient to yield tumor eradication. Histological examination of the treated mice confirmed that continued tumor growth was the cause of death in all three treatment groups. The SCK model described here has certain advantages for the evaluation of, namely, permissiveness for HSV replication and the establishment of well-circumscribed brain tumors in vivo. However, the aggressiveness of this model and the rapid onset of morbidity in tumor-bearing mice are key disadvantages. We speculate that the short time frame of this model prevented an even greater antitumor effectbeing mediated by, since prior studies indicate that treatment with stimulates an influx of immune cells including CD4+ and CD8+ T cells, macrophages, and NK cells that peaks 6-7 days post-injection of virus [25, 28], which is near the median survival observed in this model. It is possible that earlier treatment or lower input dose of cells would have allowed foragreaterantitumoreffect. Although we have shown in this proof-of-principle experiment that improves survival more effectively than a non-il-2 oncolytic HSV, additional testing to elucidate which of the various antitumor mechanisms (i.e., viral oncolysis, immune cell infiltration, or antiangiogenesis) were chiefly responsible for the improved survivalinthismodelwouldbevaluable. The potential utility of oncolytic viruses against breast cancer has been established using a number of viral systems, including HSV [50, 5]. However, only a limited number of studies have been published regarding the use of oncolytic HSVs against breast cancer brain metastases [23, 52, 53]. These include one study in which an IL-2- expressing mutant HSV did not improve survival in an immunocompetent model over that of a control virus [52], although differences in either the viral or model system employed may explain the discrepancy between this study and our findings. 5. Conclusions The clinical problem of brain metastases from breast cancer is one of ever-increasing significance, and effective therapies for these lesions are urgently needed. Here, we provide rationale for further studies of an IL-2-expressing γ 34.5-deleted HSV as a treatment for breast cancer brain metastases. We have demonstrated that an IL-2-expressing γ 34.5-deleted HSV efficiently replicates in a panel of breast cancer cells representative of brain metastases and that infection of breast cancer cells yields physiologically relevant levels of IL- 2. Treatment of intracranial tumors with this virus in an immunocompetent model of breast cancer brain metastasis improves survival more effectively than treatment with a non-cytokine control virus. We therefore conclude that an IL-2-expressing γ 34.5-deleted virus may be an effective new therapy for this disease, and further testing is warranted. While this study was, for practical reasons, conducted with an HSV expressing murine IL-2, a similar virus expressing human IL-2 has already been prepared by our research group, and a clinical trial for this virus in glioblastoma patients is planned. Therefore, the possibility exists that this virus could also be made available for a breast cancer trial. Acknowledgments This work was supported by a pilot project Grant by the UAB Breast Cancer SPORE (P50 CA08909, Bland KI, PI). 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