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Immunotoxic effects of MPT-IP containing 60% methylparathion in mice
L Institóris1, O Siroki, S Tóth
1Department of Hygiene and Epidemiology, Albert Szent-Györgyi University Medical School, Szeged, Hungary.
Abstract:
The effects of a single large and repeated small doses of MPT-IP (the industrial product used to produce Wofatox EC 50) containing 60% methylparathion, on the humoral and cellular immunoreactivity of CFLP mice were investigated. Administration of a single LD50/2 dose 3 d prior to immunization caused a 40% increase in the number of splenic PFC on the 5th day but no significant increase in serum antibody titre on the 7th day after immunization. Treatment for 4 weeks with an LD50/40 dose resulted in a 100% increase in splenic PFC, also not associated with a change in serum antibody titre. Under the same conditions and LD50/20 dose had no effect on these parameters. Neither the single large nor the repeated small doses had any effect on the intensity or time course of a DTH reaction. The results show that MPT-IP has an immunotoxic potential in mice under certain experimental conditions.
Insights
Methylparathion-containing MPT-IP showed immunotoxic potential in mice. A single large dose and repeated small doses increased splenic antibody-producing cells but did not affect antibody levels or DTH reactions.
Area of Science:
- Immunotoxicology
- Environmental Health
- Toxicology
Background:
- Methylparathion (MP) is an organophosphate insecticide.
- MPT-IP is an industrial product containing 60% methylparathion.
- Understanding the immunotoxic effects of MPT-IP is crucial for risk assessment.
Purpose of the Study:
- To investigate the effects of MPT-IP on humoral and cellular immunoreactivity in mice.
- To determine if single large or repeated small doses of MPT-IP exhibit immunotoxicity.
Main Methods:
- CFLP mice were administered single high doses or repeated low doses of MPT-IP.
- Humoral immunity was assessed by measuring splenic PFC and serum antibody titers.
- Cellular immunity was evaluated using a DTH reaction assay.
Main Results:
- A single LD50/2 dose of MPT-IP increased splenic PFC by 40% but did not alter antibody titers.
- Four weeks of LD50/40 dose treatment increased splenic PFC by 100% without affecting antibody titers.
- Neither dose regimen affected the DTH reaction's intensity or time course.
Conclusions:
- MPT-IP demonstrates immunotoxic potential in mice under specific experimental conditions.
- The observed effects on splenic PFC suggest an impact on B-cell activation.
- Further research is needed to elucidate the mechanisms of MPT-IP immunotoxicity.