Investigations into the mechanism of immunosuppression caused by acute treatment with O,O,S-trimethyl phosphorothioate: Generation of suppressive macrophages from treated animals

Kathy E. Rodgers, Toshiko Imamura, Bruce H. Devens

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

At concentrations normally found in the spleen, macrophages from animals treated with O,O,S-trimethyl phosphorothioate (OOS-TMP) for 24 hr were previously shown to be immunosuppressive (Rodgers et al., 1985b). In addition, it was shown that macrophages from OOS-TMP-treated animals had a diminished capacity to present antigen (Rodgers et al., 1985c). In this report, it was shown that lowering the number of splenic adherent cells (95% macrophages by morphology) utilized in cell-mixing experiments to reconstitute the nonadherent splenic populations returned the humoral immune response to control levels. One day following acute administration of OOS-TMP, resident peritoneal cells were able to suppress the proliferation of P815 tumor cells. In addition, proliferative responses to concanavalin A and lipopolysaccharide were decreased at suboptimal concentrations of mitogen. Fresh supernatants from splenocytes cultured for 24 hr from OOS-TMP-treated animals blocked the generation of a humoral immune response. However, supernatants from splenocytes of control animals generated in the same manner did not block the generation of a humoral immune response. These data suggest that OOS-TMP induced the generation of suppressive macrophages which may potentially act through the release of labile factors which block proliferation or antigen- or mitogen-induced lymphocyte stimulation.

Original languageEnglish (US)
Pages (from-to)270-281
Number of pages12
JournalToxicology and Applied Pharmacology
Volume88
Issue number2
DOIs
StatePublished - Apr 1987
Externally publishedYes

ASJC Scopus subject areas

  • Toxicology
  • Pharmacology

Fingerprint

Dive into the research topics of 'Investigations into the mechanism of immunosuppression caused by acute treatment with O,O,S-trimethyl phosphorothioate: Generation of suppressive macrophages from treated animals'. Together they form a unique fingerprint.

Cite this