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The Journal of Immunology, Vol 157, Issue 8 3298-3304, Copyright © 1996 by American Association of Immunologists

ARTICLES

Enterotoxin septic shock protection and deficient T helper 2 cytokine production in growth hormone transgenic mice

JA Gonzalo, R Mazuchelli, M Mellado, JM Frade, AC Carrera, C von Kobbe, I Merida and C Martinez-A
Department of Immunology and Oncology, National Center of Biotechnology, CSIC, University Autonoma, Madrid, Spain.

Neuroendocrine hormones have long been thought to play a role in lymphoid development and function. In particular, growth hormone has been shown to mediate thymic development as well as to promote T cell engraftment in severe combined immunodeficiency mice. Murine T helper cells are classified into two subsets based on their cytokine production pattern. Here, we report that transgenic mice for bovine growth hormone show significant alterations in T cell function and decreased capability for cytokine production, an effect that is more acute in T helper cells as measured by their inability to produce IL-4 upon in vivo injection with Staphylococcus aureus enterotoxin B. Furthermore, upon immunization with conventional Ags, growth hormone transgenic mice produce an altered Ig isotype pattern characterized by a response shift from IgG1 in nontransgenic mice to IgG2 in transgenic mice. The impaired T cell responses correlated with survival from septic shock mediated by bacterial enterotoxins. We conclude that growth hormone may have the potential of regulating immune responses in pathologic processes associated with hyperactivation of T cells or with massive cytokine production.


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