Related Experiment Videos
Influence of perinatal ochratoxin A exposure on the immune system in mice
A Thuvander1, P Dahl, A Breitholtz-Emanuelsson
1Toxicology Division, Swedish National Food Administration, Sweden.
Abstract:
The mycotoxin ochratoxin A (OA) is a well-documented immunotoxic agent which affects both cellular and humoral immunity. In the present study, the effects of maternal exposure to single doses of OA during gestation or lactation were studied in Balb/c offspring. A single dose exposure of the dams to OA (500 micrograms/kg body weight) on day 16 of gestation resulted in decreased proliferation of splenic and thymic lymphocytes in response to mitogens in the pups at 15 days of age. Flow cytometry analysis of thymocyte subpopulations revealed lower percentages of mature CD4+ cells and higher percentages of immature, double-positive (CD4+CD8+) cells in the exposed pups. In contrast, a single exposure of the dams of OA on day 10 postpartum significantly increased the proliferative responsiveness of lymphocytes in the offspring when stimulated with B or T cell mitogens 3 days after the exposure. This effect was most prominent in the highest dose group (500 micrograms/kg body weight). The present results are in accordance with previous observations in rats, and show that the time of exposure significantly influences the immunotoxic effects of OA on the developing immune system in rodents.
Insights
Maternal exposure to ochratoxin A (OA) impacts offspring immunity differently based on timing. Gestational exposure harms developing immune cells, while lactational exposure may boost immune responses in young rodents.
Area of Science:
- Immunotoxicology
- Developmental toxicology
- Mycotoxicology
Background:
- Ochratoxin A (OA) is a mycotoxin known to impair both cellular and humoral immunity.
- The developing immune system is particularly vulnerable to environmental insults.
- Understanding the timing of exposure is crucial for assessing OA's immunotoxic potential.
Purpose of the Study:
- To investigate the immunotoxic effects of maternal ochratoxin A (OA) exposure during gestation versus lactation on Balb/c offspring.
- To determine how the timing of OA exposure influences the developing immune system in rodents.
Main Methods:
- Maternal exposure to a single dose of OA (500 µg/kg) during gestation (day 16) or lactation (day 10 postpartum).
- Assessment of offspring splenic and thymic lymphocyte proliferation in response to mitogens at 15 days of age.
- Flow cytometry analysis of thymocyte subpopulations (CD4+, CD8+, CD4+CD8+) in exposed pups.
Main Results:
- Maternal gestational OA exposure led to decreased lymphocyte proliferation and altered thymocyte subpopulations (fewer CD4+, more CD4+CD8+) in 15-day-old pups.
- Maternal lactational OA exposure significantly increased offspring lymphocyte proliferative responses to mitogens.
- The immunomodulatory effects of OA were dose-dependent and significantly influenced by the timing of maternal exposure.
Conclusions:
- The timing of maternal ochratoxin A exposure critically determines its impact on the developing rodent immune system.
- Gestational exposure appears immunosuppressive, whereas lactational exposure may be immunostimulatory.
- These findings highlight the importance of exposure windows in assessing mycotoxin immunotoxicity.