4.5 Article

Neuropeptide Y modulates steroid production of human adrenal H295R cells through Y1 receptors

Journal

MOLECULAR AND CELLULAR ENDOCRINOLOGY
Volume 314, Issue 1, Pages 101-109

Publisher

ELSEVIER IRELAND LTD
DOI: 10.1016/j.mce.2009.08.010

Keywords

NPY; Y1 receptor; Adrenal; Steroidogenesis; Tumorigenesis

Funding

  1. Swiss National Science Foundation [320000-116299]

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Neuropeptide Y (NPY) is abundantly expressed in the nervous system and acts on target cells through NPY receptors. The human adrenal cortex and adrenal tumors express NPY receptor subtype Y1, but its function is unknown. We studied Y1-mediated signaling, steroidogenesis and cell proliferation in human adrenal NCI-H295R cells. Radioactive ligand binding studies showed that H295R cells express Y1 receptor specifically. NPY treatment of H295R cells stimulated the MEK/ERK1/2 pathway, confirming that H295R cells express functional Y1 receptors. Studies of the effect of NPY and related peptide PYY on adrenal steroidogenesis revealed a decrease in 11-deoxycortisol production. RIA measurements of cortisol from cell culture medium confirmed this finding. Co-treatment with the Y1 antagonist BIBP2336 reversed the inhibitory effect of NPY on cortisol production proving specificity of this effect. At mRNA level, NPY decreased HSD3B2 and CYP21A2 expression. However NPY revealed no effect on cell proliferation. Our data show that NPY can directly regulate human adrenal cortisol production. (C) 2009 Elsevier Ireland Ltd. All rights reserved.

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