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2016 ; 4
(9
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Dietary salt regulates uroguanylin expression and signaling activity in the
kidney, but not in the intestine
#MMPMID27185905
Fellner RC
; Moss NG
; Goy MF
Physiol Rep
2016[May]; 4
(9
): ä PMID27185905
show ga
The peptide uroguanylin (Ugn) is expressed at significant levels only in
intestine and kidney, and is stored in both tissues primarily (perhaps
exclusively) as intact prouroguanylin (proUgn). Intravascular infusion of either
Ugn or proUgn evokes well-characterized natriuretic responses in rodents.
Furthermore, Ugn knockout mice display hypertension and salt handling deficits,
indicating that the Na(+) excretory mechanisms triggered when the peptides are
infused into anesthetized animals are likely to operate under normal
physiological conditions, and contribute to electrolyte homeostasis in conscious
animals. Here, we provide strong corroborative evidence for this hypothesis, by
demonstrating that UU gnV (the rate of urinary Ugn excretion) approximately
doubled in conscious, unrestrained rats consuming a high-salt diet, and decreased
by ~15% after salt restriction. These changes in UU gnV were not associated with
altered plasma proUgn levels (shown here to be an accurate index of intestinal
proUgn secretion). Furthermore, enteric Ugn mRNA levels were unaffected by salt
intake, whereas renal Ugn mRNA levels increased sharply during periods of
increased dietary salt consumption. Together, these data suggest that diet-evoked
Ugn signals originate within the kidney, rather than the intestine, thus
strengthening a growing body of evidence against a widely cited hypothesis that
Ugn serves as the mediator of an entero-renal natriuretic signaling axis, while
underscoring a likely intrarenal natriuretic role for the peptide. The data
further suggest that intrarenal Ugn signaling is preferentially engaged when salt
intake is elevated, and plays only a minor role when salt intake is restricted.