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Phenytoin promotes Th2 type immune response in mice
1Department of Immunology, University of Occupational and Environmental Health, School of Medicine, Kitakyushu, Japan.
Clinical and Experimental Immunology
|July 27, 2001
Summary
Phenytoin, an anticonvulsive drug, enhances antibody responses but suppresses other immune cell functions in mice. This suggests phenytoin may alter immune balance, potentially via the HPA axis.
Area of Science:
- Immunology
- Pharmacology
- Neuroendocrinology
Background:
- Phenytoin is a widely used anticonvulsant medication.
- Its impact on the immune system, particularly the Th1/Th2 balance, is not fully understood.
Purpose of the Study:
- To investigate the effects of chronic phenytoin administration on immune responses in a mouse model.
- To explore the potential mechanisms underlying these immunomodulatory effects, including HPA axis involvement.
Main Methods:
- Mice were chronically administered phenytoin.
- Immune responses were assessed by measuring antibody production (IgE), spleen cell proliferation (stimulated by KLH, ConA, LPS, anti-CD3), accessory cell function, cytokine production (IL-4, IFN-gamma, IL-1α, IL-6, IL-12), and natural killer cell activity.
- Plasma levels of ACTH and corticosterone were measured.
Main Results:
- Phenytoin treatment enhanced anti-KLH IgE antibody response.
- Spleen cell proliferation and accessory cell function were reduced.
- IL-4 production was increased, while IFN-gamma and IL-1α production were decreased.
- Natural killer cell activity was diminished.
- Plasma ACTH and corticosterone levels were elevated.
Conclusions:
- Phenytoin treatment appears to induce a Th2-biased immune response in mice.
- Phenytoin may modulate immune function both directly and indirectly through activation of the hypothalamic-pituitary-adrenal (HPA) axis.
- These findings highlight the complex interplay between anticonvulsant drugs and the immune system.