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Prenatal stress depresses immune function in rats

G Kay¹, N Tarcic, T Poltyrev

¹Department of Pharmacology, Hebrew University Hadassah Medical Centre, Ein Kerem, Jerusalem, Israel.

Physiology & Behavior

|February 20, 1998

Summary

Prenatal stress in rats significantly impairs immune function in offspring. This study found reduced natural killer cell activity and B-cell proliferation, with sex-specific differences in immune suppression.

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Area of Science:

Neuroimmunology
Developmental Psychology
Immunology

Background:

Prenatal stress is a significant environmental factor impacting offspring development.
The effects of prenatal stress on the developing immune system require further elucidation.

Purpose of the Study:

To investigate the impact of prenatal stress on cellular immune responses in adult rat offspring.
To determine sex-specific effects of prenatal stress on immune function.

Main Methods:

Pregnant rats were exposed to noise and light stress.
Offspring immune function was assessed via splenic lymphocyte proliferation (B-cell and T-cell mitogens) and natural killer cell cytotoxicity.
Immune assays included [3H]thymidine uptake and [51Cr] release assays.

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Main Results:

Prenatal stress led to suppressed natural killer cell cytotoxicity in both blood and splenic lymphocytes.
A decreased proliferation rate of splenic lymphocytes was observed in response to B-cell (PWM) and T-cell (PHA) mitogens.
Immune suppression was more pronounced in females for B-cell proliferation and in males for natural killer cell cytotoxicity.

Conclusions:

Prenatal stress significantly suppresses key immune functions, including cellular proliferation and cytotoxicity, in adult offspring.
The observed immune alterations are likely due to functional modifications rather than changes in lymphocyte distribution.
Maternal stress hormones acting on the fetal neuroendocrine system may mediate these long-term immune effects.