Open AccessRegulatory roles of nitric oxide and angiotensin II on renal tubular transport
Author(s) -
Shoko Horita,
Motonobu Nakamura,
Ayumi Shirai,
Osamu Yamazaki,
Nobuhiko Satoh,
Masashi Suzuki,
George Seki
Publication year - 2014
Publication title -
world journal of nephrology
Language(s) - English
Resource type - Journals
ISSN - 2220-6124
DOI - 10.5527/wjn.v3.i4.295
Subject(s) - angiotensin ii , renal sodium reabsorption , medicine , endocrinology , nitric oxide , reabsorption , stimulation , renal physiology , renin–angiotensin system , cyclic guanosine monophosphate , homeostasis , kidney , chemistry , blood pressure
Renal tubules regulate blood pressure and humoral homeostasis. Mediators that play a significant role in regulating the transport of solutes and water include angiotensin II (AngII) and nitric oxide (NO). AngIIcan significantly raise blood pressure via effects on the heart, vasculature, and renal tubules. AngII generally stimulates sodium reabsorption by triggering sodium and fluid retention in almost all segments of renal tubules. Stimulation of renal proximal tubule (PT) transport is thought to be essential for AngII-mediated hypertension. However, AngII has a biphasic effect on in vitro PT transport in mice, rats, and rabbits: stimulation at low concentrations and inhibition at high concentrations. On the other hand, NO is generally thought to inhibit renal tubular transport. In PTs, NO seems to be involved in the inhibitory effect of AngII. A recent study reports a surprising finding: AngII has a monophasic stimulatory effect on human PT transport. Detailed analysis of signalling mechanisms indicates that in contrast to other species, the human NO/guanosine 3',5'-cyclic monophosphate/extracellular signal-regulated kinase pathway seems to mediate this effect of Ang II on PT transport. In this review we will discuss recent progress in understanding the effects of AngII and NO on renal tubular transport.