Effects of O,S,S-trimethyl phosphorodithioate on immune function

Area of Science:

• Immunotoxicology
• Pharmacology

Background:

• O,S,S-trimethyl phosphorodithioate (OSS-TMP) is an organothiophosphate compound.
• Understanding its immunomodulatory effects is crucial for risk assessment.

Purpose of the Study:

• To investigate the immunotoxicological effects of acute OSS-TMP administration in C57BL/6 female mice.
• To evaluate the impact of OSS-TMP on cellular and humoral immune responses.

Main Methods:

• Mice were administered varying doses of OSS-TMP (20-80 mg/kg).
• Toxicity was assessed via body weight, plasma cholinesterase, and thymic cellularity.
• In vivo and in vitro immune responses (CTL and humoral) were measured.

Main Results:

• Non-toxic doses (20-40 mg/kg) of OSS-TMP enhanced in vivo primary cytotoxic T lymphocyte (CTL) responses.
• Toxic doses (60-80 mg/kg) of OSS-TMP suppressed humoral immune responses but not CTL responses.
• OSS-TMP showed different immunomodulatory effects compared to its structural analog.

Conclusions:

• OSS-TMP exhibits dose-dependent immunomodulatory effects.
• Non-toxic OSS-TMP can enhance certain cellular immune functions.
• Toxic OSS-TMP primarily suppresses humoral immunity, contrasting with related compounds.