title: Effects of acute administration of O,S,S-trimethyl phosphorodithioate on the generation of cellular and humoral immune responses following in vitro stimulation.
abstract: The time course of immune modulation induced by acute treatment with O,S,S-trimethyl phosphorodithioate (OSS-TMP), an impurity in technical formulations of malathion, was examined in female C57BL/6 mice. The immune parameters studied included the generation of cytotoxic T lymphocytes (CTL) to alloantigen (H-2 incompatible) and antibody secreting cells to sheep red blood cells, proliferative response to the mitogens, and interleukin-2 (IL-2) production. Acute administration of the non-toxic doses of OSS-TMP, i.e. 20 or 40 mg/kg, led to an elevation in the generation of a CTL response on day 1 or 7, respectively. At 20 mg/kg OSS-TMP, the antibody response was elevated at day 3. However, at a dose of 40 mg/kg OSS-TMP, the antibody response was suppressed at day 1 following treatment. Following acute administration of 60 or 80 mg/kg OSS-TMP, the generation of an antibody and CTL responses was suppressed at all time points tested with 1 exception. One day following treatment at a dose of 60 mg/kg OSS-TMP, there was no change in the CTL response. At day 7 following treatment, the mitogenic responses to lipopolysaccharide and phytohemagglutinin were elevated at all doses of OSS-TMP administered. At this time point, however, the proliferative response to Concanavalin A was elevated in a dose dependent manner. IL-2 production was suppressed following acute administration of 60 or 80 mg/kg OSS-TMP at all time points tested and at all doses tested on day 5 following treatment. These data indicate that OSS-TMP, unlike its congener, O,O,S-trimethyl phosphorothioate, enhances the generation of humoral and cell mediated immune responses of C57BL/6 mice following administration of non-toxic doses.
mesh_terms: D000818:Animals; D000917:Antibody Formation / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005260:Female; D006462:Hemolytic Plaque Technique; D007111:Immunity, Cellular / Q000187:drug effects*; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation / Q000187:drug effects; D051379:Mice; D008810:Mice, Inbred C57BL; D008934:Mitogens / Q000494:pharmacology; D063086:Organothiophosphates / Q000494:pharmacology*; D009946:Organothiophosphorus Compounds / Q000494:pharmacology*; D013154:Spleen / Q000378:metabolism; D013602:T-Lymphocytes, Cytotoxic / Q000187:drug effects
chemical_list: D007376:Interleukin-2; D008934:Mitogens; D063086:Organothiophosphates; D009946:Organothiophosphorus Compounds; C033125:O,S,S-trimethyl phosphorodithioate