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Am J Physiol Renal Physiol 270: F311-F318, 1996;
0363-6127/96 $5.00
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AJP - Renal Physiology, Vol 270, Issue 2 311-F318, Copyright © 1996 by American Physiological Society

ARTICLES

Distribution and regulation of guanylyl cyclase type B in the rat nephron

A. D. Dean, V. M. Vehaskari, D. Ritter and J. E. Greenwald
Department of Medicine, Washington University School of Medicine, St. Louis 63110, USA. adean@biodec.wustl.edu

C-type natriuretic peptide (CNP) has been localized to the proximal and distal nephron. In this study, we examined the distribution and regulation of the CNP receptor, guanylyl cyclase type B (GC-B), in the rat kidney. GC-B mRNA was detected most frequently in microdissected glomeruli, thin and thick limbs of the loop of Henle, and outer and inner medullary collecting ducts by reverse transcription-polymerase chain reaction (RT-PCR). This pattern of expression is supported by immunofluorescent staining, using anti-GC-B-specific antiserum. Nearly equivalent levels of GC-B and guanylyl cyclase type A (GC-A) mRNAs were found by quantitative RT-PCR (5,662 +/- 1,622 and 5,187 +/- 1,204 molecules of cDNA/microgram total RNA, respectively; means +/- SE, n = 6). Renal inner medulla GC-B mRNA levels, but not renal CNP mRNA levels, were 3.2-fold greater in hypervolemic and 2.3-fold less in hypovolemic rats compared with euvolemic controls. Immunohistochemical staining also supports a greater GC-B expression with increased volume status. These data link hydration status and GC-B expression and suggest an additional and novel mechanism for regulating intravascular volume.


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