Arginine vasopressin enhances pHi regulation in the presence of HCO3- by stimulating three acid-base transport systems.

Abstract:

:Growth factors raise intracellular pH (pHi) by stimulating Na+/H+ exchange in the absence of HCO3-. In mutant cells that lack the Na+/H+ exchange activity, this alkalinization does not occur, and the cells do not proliferate without artificial elevation of pHi. It has therefore been widely suggested that an early pHi increase is a necessary signal for mitogenesis. In the presence of HCO3- however, growth factors fail to raise pHi in A431 cells, renal mesangial cells and 3T3 fibroblasts. In mesangial cells, arginine vasopressin (AVP) raises pHi in the absence of HCO3-, but lowers it when HCO3- is present; growth is stimulated under both conditions. We report here that, in the presence of HCO3-, AVP stimulates two potent HCO3- transporters, as well as the Na+/H+ exchanger. These are the Na+-dependent and Na+-independent Cl-/HCO3- exchangers. Our results indicate that AVP causes acidification in the presence of HCO3- because, at the resting pHi, it stimulates Na+-independent Cl-/HCO3- exchange (which lowers pHi) more than it stimulates the sum of Na+/H+ exchange and Na+-dependent Cl-/HCO3- exchange (both of which raise pHi). The stimulation of three acid-base transporters by the growth factor AVP greatly enhances the ability of the cell to regulate pHi.

journal_name

Nature

journal_title

Nature

authors

Ganz MB,Boyarsky G,Sterzel RB,Boron WF

doi

10.1038/337648a0

subject

Has Abstract

pub_date

1989-02-16 00:00:00

pages

648-51

issue

6208

eissn

0028-0836

issn

1476-4687

journal_volume

337

pub_type

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