title: Effects of subacute administration of O,S,S-trimethyl phosphorodithioate on cellular and humoral immune response systems.
abstract: The effects of 14-day treatment with low doses of O,S,S-trimethyl phosphorodithioate (OSS-TMP), an impurity in technical malathion, on the generation of cell-mediated and humoral immune responses were examined in female C57BL/6 mice. At a dose of 2.0 mg/kg per day OSS-TMP, the generation of antibody-secreting cells to sheep red blood cells, the generation of cytotoxic T lymphocytes (CTL) to alloantigen and the production of Interleukin-2 were elevated approximately 2-3 fold, while no changes were observed in the proliferative responses to the polyclonal activators, Concanavalin A, lipopolysaccharide, or phytohemagglutinin. In contrast, at 5.0 mg/kg per day OSS-TMP, both the CTL and specific antibody responses were suppressed, while all other immune parameters examined were unchanged. Data from cell separation and reconstitution experiments indicated that both T and B lymphocytes were affected by these treatment regimes. These data suggest that long-term exposure to low doses of OSS-TMP may enhance the ability of an animal to generate an immune response while higher doses of OSS-TMP may suppress the generation of an immune response.
authors: Livingston Research Institute, USC School of Medicine, Los Angeles 90033.
authors: K E
authors: KE
authors: Rodgers
authors: M L
authors: ML
authors: Stern
authors: C F
authors: CF
authors: Ware
mesh_terms: D000818:Animals; D000917:Antibody Formation / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D005260:Female; D007111:Immunity, Cellular / Q000187:drug effects*; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation / Q000187:drug effects; D051379:Mice; D063086:Organothiophosphates / Q000633:toxicity*; D009946:Organothiophosphorus Compounds / Q000633:toxicity*; D013602:T-Lymphocytes, Cytotoxic / Q000187:drug effects / Q000276:immunology
chemical_list: D007376:Interleukin-2; D063086:Organothiophosphates; D009946:Organothiophosphorus Compounds; C033125:O,S,S-trimethyl phosphorodithioate