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Minireview: Neuro-Immuno-Endocrine Modulation of the Hypothalamic-Pituitary-Adrenal (HPA) Axis by gp130 Signaling Molecules

Cedars-Sinai Research Institute-University of California Los Angeles School of Medicine, Los Angeles, California 90048

Address all correspondence and requests for reprints to: Shlomo Melmed, M.D., Academic Affairs, Room 2015 Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, California 90048. E-mail: . melmed{at}csmc.edu

The neuroendocrine and immune systems communicate bidirectionally. The neuro-immune-endocrine interface is mediated by cytokines acting as auto/paracrine or endocrine factors regulating pituitary development, cell proliferation, hormone secretion, and feedback control of the hypothalamic-pituitary-adrenal (HPA) axis. At birth or during neonatal ontogenesis, cytokines produce permanent alterations of HPA axis function and the stress response. Overexpressing IL-6 or leukemia inhibitory factor leads to significant changes in pituitary development and functions. Pituitary corticotroph POMC gene expression is regulated by CRH as well as several gp130 cytokines acting as neuro-immuno-endocrine modulators. Conversely, HPA axis functions modulate susceptibility or resistance to inflammatory disease. Cytokines (including IL-1, TNF, and members of the gp130 cytokine family) participate as mediators of a complex HPA axis response to stress and inflammation. Prolonged exposure to proinflammatory cytokines increases levels of the dominant negative glucocorticoid receptor isoform. Nonresponsiveness of the HPA axis to glucocorticoid negative feedback control provides a defense from destructive effects of cytokine excess. At the same time, gp130 cytokines stimulate pituitary suppressor of cytokine signaling (SOCS)-3, which represses cytokine signaling and abrogates cytokine-induced corticotroph POMC gene transcription and ACTH secretion.

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