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Ikaros integrates endocrine and immune system development
Shereen Ezzat, … , Philippe Poussier, Sylvia L. Asa
Shereen Ezzat, … , Philippe Poussier, Sylvia L. Asa
Published April 1, 2005
Citation Information: J Clin Invest. 2005;115(4):1021-1029. https://doi.org/10.1172/JCI22486.
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Ikaros integrates endocrine and immune system development

Abstract

Ikaros transcription factors are essential regulators of lymphopoiesis and the development of the immune system. We now show that Ikaros is expressed in hormone-producing pituitary corticomelanotroph cells, where it binds the proopiomelanocortin promoter and regulates endogenous gene expression. Loss of Ikaros in vivo results in contraction of the pituitary corticomelanotroph population, reduced circulating adrenocorticotrophic hormone levels, and adrenal glucocorticoid insufficiency. While hemopoietic reconstitution failed to correct this hormonal deficit, the phenotype of reduced body weight and diminished survival was rescued by systemic glucocorticoid-hormone administration. Given the established immunomodulatory properties of glucocorticoid hormones, these findings reveal a novel role for Ikaros in orchestrating immune-endocrine development and function.

Authors

Shereen Ezzat, Rene Mader, ShunJiang Yu, Terry Ning, Philippe Poussier, Sylvia L. Asa

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