A role of the (pro)renin receptor in neuronal cell differentiation

Item Type:	Article
Title:	A role of the (pro)renin receptor in neuronal cell differentiation
Creators Name:	Contrepas, A. and Walker, J. and Koulakoff, A. and Franek, K.J. and Qadri, F. and Giaume, C. and Corvol, P. and Schwartz, C.E. and Nguyen, G.
Abstract:	The (pro)renin receptor [(P)RR] plays a pivotal role in the renin-angiotensin system. Experimental models emphasize the role of (P)RR in organ damage associated with hypertension and diabetes. However, a mutation of the (P)RR gene, resulting in frame deletion of exon 4 [Delta4-(P)RR] is associated with X-linked mental retardation (XLMR) and epilepsy pointing to a novel role of (P)RR in brain development and cognitive function. We have studied (P)RR expression in mouse brain, as well as the effect of transfection of Delta4-(P)RR on neuronal differentiation of rat neuroendocrine PC-12 cells induced by nerve growth factor (NGF). In situ hybridization showed a wide distribution of (P)RR, including in key regions involved in the regulation of blood pressure and body fluid homeostasis. In mouse neurons, the receptor is on the plasma membrane and in synaptic vesicles, and stimulation by renin provokes ERK1/2 phosphorylation. In PC-12 cells, (P)RR localized mainly in the Golgi and in endoplasmic reticulum and redistributed to neurite projections during NGF-induced differentiation. In contrast, Delta4-(P)RR remained cytosolic and inhibited NGF-induced neuronal differentiation and ERK1/2 activation. Cotransfection of PC-12 cells with (P)RR and Delta4-(P)RR cDNA resulted in altered localization of (P)RR and inhibited (P)RR redistribution to neurite projections upon NGF stimulation. Furthermore, (P)RR dimerized with itself and with Delta4-(P)RR, suggesting that the XLMR and epilepsy phenotype resulted from a dominant-negative effect of Delta4-(P)RR, which coexists with normal transcript in affected males. In conclusion, our results show that (P)RR is expressed in mouse brain and suggest that the XLMR and epilepsy phenotype might result from a dominant-negative effect of the Delta4-(P)RR protein.
Keywords:	Brain (P)RR Expression, Functional (P)RR, X-Linked Mental Retardation, Cultured Cells, Animals, Mice, Rats
Source:	American Journal of Physiology Regulatory Integrative and Comparative Physiology
ISSN:	0363-6119
Publisher:	American Physiological Society
Volume:	297
Number:	2
Page Range:	R250-R257
Date:	August 2009
Official Publication:	https://doi.org/10.1152/ajpregu.90832.2008
PubMed:	View item in PubMed

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