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Disabled-2 Is Expressed in Adrenal Zona Glomerulosa and Is Involved in Aldosterone Secretion

Division of Endocrinology (D.G.R., L.L.Y., A.F.d.R., M.W.P., B.L.W., E.P.G.-S., C.E.G.-S.), G. V. (Sonny) Montgomery Veterans Affairs Medical Center, and Departments of Medicine (D.G.R., L.L.Y., A.F.d.R., B.L.W., E.P.G.-S., C.E.G.-S.), Physiology and Biophysics (J.F.R.), and Pharmacology and Toxicology (E.P.G.-S.), University of Mississippi Medical Center, Jackson, Mississippi 39216

Address all correspondence and requests for reprints to: Damian G. Romero, Ph.D., Division of Endocrinology, Department of Medicine, The University of Mississippi Medical Center, 2500 North State Street, Jackson, Mississippi 39216. E-mail: dromero{at}medicine.umsmed.edu.

The differentiation of the adrenal cortex into functionally specific zones is probably due to differential temporal gene expression during fetal growth, development, and adulthood. In our search for adrenal zona glomerulosa-specific genes, we found that Disabled-2 (Dab2) is expressed in the zona glomerulosa of the rat adrenal gland using a combination of laser capture microdissection, mRNA amplification, cDNA microarray hybridization, and real-time RT-PCR. Dab2 is an alternative spliced mitogen-regulated phosphoprotein with features of an adaptor protein and functions in signal transduction, endocytosis, and tissue morphogenesis during embryonic development. We performed further studies to analyze adrenal Dab2 localization, regulation, and role in aldosterone secretion. We found that Dab2 is expressed in the zona glomerulosa and zona intermedia of the rat adrenal cortex. Low-salt diet treatment increased Dab2-long isoform expression at the mRNA and protein level in the rat adrenal gland, whereas high-salt diet treatment did not cause any significant modification. Angiotensin II infusion caused a transient increase in both Dab2 isoform mRNAs in the rat adrenal gland. Dab2 overexpression in H295R human adrenocortical cells caused an increase in aldosterone synthase expression and up-regulated aldosterone secretion under angiotensin II-stimulated conditions. In conclusion, Dab2 is an adrenal gland zona glomerulosa- and intermedia-expressed gene that is regulated by aldosterone secretagogues such as low-salt diet or angiotensin II and is involved in aldosterone synthase expression and aldosterone secretion. Dab2 may therefore be a modulator of aldosterone secretion and be involved in mineralocorticoid secretion abnormalities.

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				D. G. Romero, M. W. Plonczynski, B. L. Welsh, C. E. Gomez-Sanchez, M. Y. Zhou, and E. P. Gomez-Sanchez Gene expression profile in rat adrenal zona glomerulosa cells stimulated with aldosterone secretagogues Physiol Genomics, December 19, 2007; 32(1): 117 - 127. [Abstract] [Full Text] [PDF]