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Using a Novel CD133+ Immune Magnetic Particle to Separate Gastric Adenocarcinoma Stem Cells from Peripheral Blood and the Pluripotency Study About the Separated Cells.

Background: Stem cells isolated from peripheral blood of gastric adenocarcinoma patients have noninvasive advantages. However, at present, there is no simple and effective separation technique. Purpose: In this study, CD133+ cells were isolated from peripheral blood of patients with gastric adenocarcinoma by using specific immunomagnetic particles, and the immunology of subcultured cells was identified to evaluate whether the immune magnetic particle separation had any effect on the cells themselves. Methods: Immune magnetic particles, made by a specific technique, are used to sort out the cells whose membrane could express CD133 from peripheral blood of gastric adenocarcinoma patients. By observing the sorted cells within serum-free culturing, we compare the differences in morphology and proliferation ability between the collected cells and cells from a standard tumor cell line. At the same time, an immunofluorescence method is used to detect the expression of the CD133 antibody. Moreover, this study explores the inhibition effect on gastric adenocarcinoma stem cell growth when combining 5-fluorouracil and methionine enzymes. Results and Conclusions: The specific immunomagnetic particles have a small diameter and strong sorting characteristics. In the experiment, there were 20 patients with gastric adenocarcinoma. CD133+ cells were separated successfully from peripheral blood of 13 patients (65%), among which subcultured cells of 9 cases (69.2%) were found to express CD44+ antigens. The sorted cells grew vigorously with a variety of morphologies in non-inducing culture, while the cells induced by β transforming growth factor presented slow growth and uniform morphology. There was a significant difference (P < 0.05) in cell proliferation between these two groups and the standard tumor cell line. In addition, 5-fluorouracil combined with methionine enzyme inhibited the growth of gastric adenocarcinoma stem cells significantly (P < 0.05). Accordingly, the CD133+/CD44+ cells from peripheral blood of gastric adenocarcinoma patients, sorted by specific immune magnetic particles, had clear stem cell properties as determined by cell function and structure. This lays a foundation for gastric adenocarcinoma stem cell extraction, culture and further research on stem cell characteristics.