The amiloride-sensitive Na+/H+ exchange antiporter and control of intracellular pH in hippocampal brain slices.

Abstract:

:The intracellular pH, 7.54 +/- 0.03 (mean +/- S.D., n = 15), determined with the Neutral red method, of the hippocampal brain slice preparation under baseline incubation conditions is considerably more alkaline than the bath buffer pH. Neutralization by amiloride suggests that the alkalinity was due to Na+/H+ exchange antiporter activation. To characterize the brain Na+/H+ exchange antiporter we compared the inhibitory effects of MIA, amiloride and other 5-N substituted analogues on proton extrusion after acid loading by transient exposure to ammonium chloride in the isolated hippocampal brain slice preparation. The potencies of amiloride compounds on the initial recovery rate of intracellular pH after acid-loading were DMA > MIA > HMA = MHA > or = IPA-HCI > IPA > MNPA = Amil > Benzamil. The greater potency of the 5-N substituted analogs of amiloride over amiloride and benzamil strongly suggest that Na+/H+ exchange antiporter is the mechanism responsible for alkalinization in the isolated hippocampal brain slice in vitro.

journal_name

Brain Res

journal_title

Brain research

authors

Lin CW,Kalaria RN,Kroon SN,Bae JY,Sayre LM,LaManna JC

doi

10.1016/0006-8993(96)00512-4

subject

Has Abstract

pub_date

1996-08-26 00:00:00

pages

108-13

issue

1-2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(96)00512-4

journal_volume

731

pub_type

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