title: Helper T cell subpopulations from women are more susceptible to the toxic effect of sodium arsenite in vitro.
abstract: Arsenic is known to produce inhibition as well as induction of proliferative responses in animal and human cells depending on the doses. Despite the amount of information on the immunotoxic effects of arsenic exposure in different animal models, little is known in humans. Arsenic susceptibility of lymphocyte subpopulations (T helper (Th), CD4+; T cytotoxic (Tc), CD8+) and whether arsenic effects are gender related are still to be determined. This work evaluated the in vitro toxicity of sodium arsenite on human T lymphocyte subpopulations from men and women. Peripheral blood mononuclear cells (PBMC) obtained from healthy young men and women were treated with sodium arsenite (0.01, 0.1, and 1 microM). We assessed cell viability, cell proliferation, and the proportion of Th and Tc cells after 48 or 72h of arsenic exposure in resting and phytohemagglutinin M (PHA)-activated PBMC. We observed that sodium arsenite at 1 microM was more toxic for Th than for Tc cells in PBMC from women. Besides, T lymphocytes from women were more affected by the cell proliferation inhibition induced by arsenic, suggesting that women could be more susceptible to the toxic and immunotoxic effects caused by arsenic exposure.
authors.affiliation: Sección Externa de Toxicología, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, San Pedro Zacatenco, Apdo. Postal 07000, D.F. 07600, Mexico. lvega@mail.cinvestav.mx
authors.forename: Libia
authors.initials: L
authors.lastname: Vega
authors.forename: Pável
authors.initials: P
authors.lastname: Montes de Oca
authors.forename: Rafael
authors.initials: R
authors.lastname: Saavedra
authors.forename: Patricia
authors.initials: P
authors.lastname: Ostrosky-Wegman
mesh_terms: D000328:Adult; D018053:Arsenites / Q000633:toxicity*; D002455:Cell Division / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D004791:Enzyme Inhibitors / Q000633:toxicity*; D005260:Female; D006801:Humans; D008213:Lymphocyte Activation / Q000187:drug effects; D008297:Male; D012737:Sex Factors; D017670:Sodium Compounds / Q000633:toxicity*; D016176:T-Lymphocyte Subsets / Q000187:drug effects* / Q000473:pathology; D006377:T-Lymphocytes, Helper-Inducer / Q000187:drug effects* / Q000473:pathology
chemical_list: D018053:Arsenites; D004791:Enzyme Inhibitors; D017670:Sodium Compounds; C017947:sodium arsenite