 in human milk, 3,3',4,4',5-pentachlorobiphenyl (PCBP), increased the activation level of caspase-3, each in a dose-dependent manner [14].
Interaction of tributyltin with 3,3',4,4',5-pentachlorobiphenyl-induced ethoxyresorufin O-deethylase activity in rat hepatoma cells [15].
3,3',4,4'-Tetra- and 3,3',4,4',5-pentachlorobiphenyl induced the cytochrome P-448-dependent monooxygenase, ethoxyresorufin O-deethylase (EROD), and resembled 3-methylcholanthrene in their mode of monooxygenase enzyme induction [16].
The present paper describes a marked induction of liver microsomal cytochrome P-450 and cytosolic DT-diaphorase to cause possible disorder of steroid homeostasis and promotion of carcinogenicity of 4-nitroquinoline N-oxide (4-NQO) in rats by pretreatment with 3,4,5,3',4'-pentachlorobiphenyl (PenCB) or 2,3,4,7,8-pentachlorodibenzofuran (PenCDF) [17].
A coplanar polychlorinated biphenyl, 3,3',4,4',5-pentachlorobiphenyl (PenCB), significantly suppresses the expression of rat liver carbonic anhydrase III (CAIII), an enzyme which has recently been suggested to prevent from H(2)O(2)-inducible apoptosis [19].
The effects of the coplanar congener 3,3',4,4',5-pentachlorobiphenyl (PCB 126) on developmental endpoints, hematology, serum biochemistry, and performance on a spatial delayed alternation task were assessed in Long-Evans rats [18].
Induction of CYP1A1 in primary rat hepatocytes by 3,3',4,4',5-pentachlorobiphenyl: evidence for a switch circuit element [20].
Immunoblot analysis of hamster liver microsomes revealed that P450HPB-1 was constitutive and phenobarbital-inducible but was decreased by pretreatment with 3-methylcholanthrene or 3,4,5,3',4'-pentachlorobiphenyl [21].
In both cell lines the distribution of fluorescence increased with increasing concentrations of PCB 126 [2].
Although TCDD exposure was not associated with changes in PBMC surface antigen expression, elevated serum concentrations of TCDD, 1,2,3,6,7,8-hexachlorodibenzofuran and 3,3',4,4',5-pentachlorobiphenyl correlated with increased numbers of CD3+/CD25- and CD3-/CD25+ leukocytes and enhanced secretion of TNF-alpha by mitogen-stimulated PBMC [22].
The coplanar polychlorinated biphenyl congeners 3,4,5,3',4'-pentachlorobiphenyl (PCB126) and 3,4,3',4'-tetrachlorobiphenyl (PCB77) both induced staining in fetal tissues identical to that observed following TCDD exposure [23].
To determine if another aryl hydrocarbon receptor agonist produced a similar response, graded doses of TCDD; 3,3',4,4',5-pentachlorobiphenyl (PeCB 126); or 2,2',4,4',5,5'-hexachlorobiphenyl (HxCB 153) were injected into WLB eggs [24].
Effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), 3,3',4,4',5-pentachlorobiphenyl (PCB 126), or 2,3,3',4,4',5-hexachlorobiphenyl (PCB 156) on thyroid hormone metabolism were studied in 13-week feeding studies in female Sprague-Dawley rats [25].
The purpose of this study was to compare effects on rat bone and uterus of estrogen depletion and exposure to the coplanar PCB-congener 3,3',4,4',5-pentachlorobiphenyl (PCB #126) which exhibits anti-estrogenic properties [26].
Effects of maternal exposure to 3,3',4,4',5-pentachlorobiphenyl (PCB126) or 3,3',4,4',5,5'-hexachlorobiphenyl (PCB169) on testicular steroidogenesis and spermatogenesis in male offspring rats [27].
Positive relationships were found between trophic levels and lipid equivalent concentrations of non- and mono-ortho PCBs except for PCB-77, PCB-81, PCB-126, PCB-156, and PCB-167, indicating bioaccumulation of these compounds in this food web [28].
None of the AHR ligands tested, i.e. TCDD, benzo[a]pyrene, 3,3',4,4',5-pentachlorobiphenyl, beta-naphthoflavone, or alpha-naphthoflavone, bound to ER alpha [29].
CYP1 and AhR expression in 7,12-dimethylbenz[a]anthracene-induced mammary carcinoma of rats prenatally exposed to 3,3',4,4',5-pentachlorobiphenyl [30].
Previous research from our laboratory has shown a switch-like response to PCB 126 mediated CYP1A1 induction in primary rat hepatocytes and in H4IIE rat hepatoma cells [31].
When the sea bass were treated with either 10 or 100 microg/kg PCB 126, an AhR ligand not yet tested in vivo in fish to assess its anti-estrogenicity, a modest and selective induction of EROD and DT-diaphorase activities was observed [32].
The objective of this research was to examine the time- and dose- dependent disturbances in the hypothalamic-pituitary-thyroid (HPT) axis of adult male rats administered a potent coplanar (non-ortho) PCB, 3,3',4,4',5-pentachlorobiphenyl (PCB 126) [33].
Immunoblotting studies showed that MAP kinases ERK and JNK are not activated by PCB 126 in H4IIE cells and the ERK inhibitor U0126 did not impair CYP1A1 induction [31].
Pregnant does (10 goats/group) were dosed orally with either PCB 153 or PCB 126 dissolved in corn oil or only corn oil (control group) from day 60 of gestation until delivery [34].
The aim of this study was to compare effects of estrogen depletion (ovariectomy) and exposure to 3,3',4,4',5-pentachlorobiphenyl (PCB126) on bone strength and bone tissue composition in the rat [35].
Male Wistar rats were given a single intraperitoneal injection of 3,3',4,4',5-pentachlorobiphenyl at a dose of 25 mg/kg [36].
A 54-kDa protein in rat liver cytosol was significantly induced by treatment with 3,4,5,3',4'-pentachlorobiphenyl (25 mg/kg, single i.p.) and 3-methylcholanthrene (20 mg/kg, once a day for 3 days, i.p.). The protein exhibited pI of 6.8 on two-dimensional gel electrophoresis [37].
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