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Prenatal stress alters immune function in the offspring of rats
Insights
Prenatal stress in pregnant rats altered offspring immune responses. Offspring showed enhanced antibody production and varied Natural Killer (NK) cell activity, suggesting lasting immune system effects from maternal stress.
Area of Science:
- Immunology
- Developmental Psychology
- Neuroscience
Background:
- Maternal stress during gestation can impact offspring development.
- Prenatal stress effects on the immune system are not fully understood.
Purpose of the Study:
- To investigate the long-term effects of prenatal stress on cellular and humoral immune responses in offspring.
- To examine sex-specific differences in immune responses following prenatal stress.
Main Methods:
- Pregnant rats were exposed to restraint stress or left undisturbed during late gestation.
- Offspring immune responses were assessed via Concanavalin A-stimulated splenocyte proliferation and Natural Killer (NK) cell cytotoxicity.
- Humoral immunity was measured by anti-Keyhole Limpet Hemocyanin (KLH) antibody levels in adult offspring.
Main Results:
- Prenatal stress did not affect splenocyte proliferation in offspring.
- Juvenile offspring showed reduced NK cytotoxicity in males exposed to stress, while adult offspring exhibited enhanced NK cytotoxicity regardless of sex.
- Offspring exposed to prenatal stress had elevated anti-KLH antibody levels.
Conclusions:
- Prenatal stress can modulate offspring immune system development, particularly affecting Natural Killer (NK) cell activity and humoral immune responses.
- The impact of prenatal stress on immune function may differ between juvenile and adult stages and show sex-specific patterns.
- Elevated antibody production suggests a heightened or altered adaptive immune response in prenatally stressed offspring.
Abstract:
Pregnant rats were either exposed to restraint under bright lights for 45 min three times daily (n = 7) or were left undisturbed (n = 8) during Days 14-21 of gestation. Offspring were tested for cellular immune responses as measured by Concanavalin A-stimulated proliferation and Natural Killer (NK) cytotoxicity of splenocytes as juveniles or adults, or were tested for specific humoral immune responses to in vivo challenge with the antigen Keyhole Limpet Hemocyanin (KLH) as adults. Results indicated that: (a) Proliferation did not vary as a function of sex or prenatal treatment in either juvenile or adult offspring; (b) in juveniles NK cytotoxicity was marginally lower in males as compared to females, and was also marginally reduced by prenatal stress in males but not females, whereas in adults, NK cytotoxicity was marginally enhanced by prenatal stress in both sexes; and (c) prenatally stressed offspring of both sexes had higher levels of anti-KLH antibodies as compared to controls.