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HERO ID
990428
Reference Type
Journal Article
Title
Role of the Rhesus glycoprotein, Rh B glycoprotein, in renal ammonia excretion
Author(s)
Bishop, JM; Verlander, JW; Lee, HW; Nelson, RD; Weiner, AJ; Handlogten, ME; Weiner, ID
Year
2010
Is Peer Reviewed?
Yes
Journal
American Journal of Physiology: Renal Physiology
ISSN:
1931-857X
Volume
299
Issue
5
Page Numbers
F1065-F1077
Language
English
PMID
20719974
DOI
10.1152/ajprenal.00277.2010
Web of Science Id
WOS:000283846800019
Abstract
Rh B glycoprotein (Rhbg) is a member of the Rh glycoprotein family of ammonia transporters. In the current study, we examine Rhbg's role in basal and acidosis-stimulated acid-base homeostasis. Metabolic acidosis induced by HCl administration increased Rhbg expression in both the cortex and outer medulla. To test the functional significance of increased Rhbg expression, we used a Cre-loxP approach to generate mice with intercalated cell-specific Rhbg knockout (IC-Rhbg-KO). On normal diet, intercalated cell-specific Rhbg deletion did not alter urine ammonia excretion, pH, or titratable acid excretion significantly, but it did decrease glutamine synthetase expression in the outer medulla significantly. After metabolic acidosis was induced, urinary ammonia excretion was significantly less in IC-Rhbg-KO than in control (C) mice on days 2–4 of acid loading, but not on day 5. Urine pH and titratable acid excretion and dietary acid intake did not differ significantly between acid-loaded IC-Rhcg-KO and C mice. In IC-Rhbg-KO mice, acid loading increased connecting segment (CNT) cell and outer medullary collecting duct principal cell Rhbg expression. In both C and IC-Rhbg-KO mice, acid loading decreased glutamine synthetase in both the cortex and outer medulla; the decrease on day 3 was similar in IC-Rhbg-KO and C mice, but on day 5 it was significantly greater in IC-Rhbg-KO than in C mice. We conclude 1) intercalated cell Rhbg contributes to acidosis-stimulated renal ammonia excretion, 2) Rhbg in CNT and principal cells may contribute to renal ammonia excretion, and 3) decreased glutamine synthetase expression may enable normal rates of ammonia excretion under both basal conditions and on day 5 of acid loading in IC-Rhbg-KO mice.
Tags
IRIS
•
Ammonia
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Physical-Chemical/Mechanistic/Toxicokinetics Studies
Toxicokinetics
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