Kurt, Birguel and Kurtz, Lisa and Sequeira-Lopez, Maria L. and Gomez, R. Ariel and Willecke, Klaus and Wagner, Charlotte and Kurtz, Armin (2011) Reciprocal expression of connexin 40 and 45 during phenotypical changes in renin-secreting cells. AMERICAN JOURNAL OF PHYSIOLOGY-RENAL PHYSIOLOGY, 300 (3). F743-F748. ISSN 1931-857X,
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Kurt B, Kurtz L, Sequeira-Lopez ML, Gomez RA, Willecke K, Wagner C, Kurtz A. Reciprocal expression of connexin 40 and 45 during phenotypical changes in renin-secreting cells. Am J Physiol Renal Physiol 300: F743-F748, 2011. First published January 5, 2011; doi:10.1152/ajprenal.00647.2010.-Gap junctional coupling of renin-producing cells is of major functional importance for the control of renin synthesis and release. This study was designed to determine the relevance of the vascular gap junction protein connexin 45 (Cx45) for the control of renin expression and secretion. By crossbreeding mice which drive Cre recombinase under the control of the endogenous renin promoter with mice harboring floxed Cx45 gene alleles, we generated viable mice with a deletion of Cx45 in the renin cell lineage. These mice were normotensive, and renin cells in their kidneys were normal with regard to localization and number. Sodium deficiency induced typical recruitment of renin-producing cells along afferent arterioles, whereas sodium overload resulted in a decrease in the number of cells expressing renin. Regulation of renin secretion by perfusion pressure, catecholamines, and angiotensin II from isolated kidneys of mice with renin cell-specific deletion of Cx45 was normal. Analyzing Cx45 promoter activity in cells of the preglomerular arteriolar tree by using mice driving the reporter gene LacZ under the control of the Cx45 promoter revealed strong staining in smooth muscle cells of the media, whereas renin-expressing cells were almost devoid of LacZ staining. Conversely, renin-producing cells, but not vascular smooth muscle cells expressed the gap junction protein Cx40. These findings suggest that Cx45 plays no major functional role in renin-producing cells, probably because the expression of Cx45 is downregulated in these cells. Since renin-producing cells in the adult kidney can reversibly transform into vascular smooth muscle cells and vice versa, our findings on connexin expression indicate that these phenotype switches are paralleled by characteristic reciprocal changes in the transcriptional activity of Cx40 and Cx45 genes.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | JUXTAGLOMERULAR APPARATUS; BLOOD-PRESSURE; ARTERIOLES; MICE; HYPERTENSION; DELETION; KIDNEYS; NESTIN; gap junctional coupling |
| Subjects: | 500 Science > 570 Life sciences 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Innere Medizin II Biology, Preclinical Medicine > Institut für Physiologie > Prof. Dr. Armin Kurtz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 25 Jun 2020 07:30 |
| Last Modified: | 25 Jun 2020 07:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/21226 |
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