Na+/H+ exchange is responsible for intracellular pH regulation in insulin-secreting HIT-T15 cells.

Abstract:

:The addition of glucose to suspensions of HIT-T15 insulinoma cells caused a small, transient acidification followed by a gradual, progressive alkalinisation, as assessed by the fluorescent pH-sensitive dye 2',7'-biscarboxyethyl-5'-(6')-carboxyfluorescein (BCECF). Treatment of cells with acetate or lactate produced an immediate, marked acidification followed by recovery and a subsequent alkalinisation. In contrast, addition of NH4Cl caused a rapid rise in intracellular pH (pHi) and recovery to resting values. In cells where Na+/H+ exchange was inhibited, either with amiloride or by omission of Na+ from the medium, glucose caused a progressive acidification, whilst recovery from acetate- or lactate-induced acidification was prevented. Under sodium-free conditions, recovery from acidification could be initiated by addition of Na+. Inhibition of HCO3-/Cl- exchange by pretreatment with 4,4'-diisothiocyanatostilbene 2,2'-disulphonic acid (DIDS), or by omission of HCO3- or Cl- from the medium did not affect any of the changes in pHi elicited by the above agents. It is concluded that the principal mechanism responsible for pHi regulation in HIT-T15 cells is the Na+/H+ antiporter and that the HCO3-/Cl- exchange systems make little, if any, contribution.

journal_name

Mol Cell Endocrinol

authors

Trebilcock R,Lynch A,Tomlinson S,Best L

doi

10.1016/0303-7207(90)90070-o

subject

Has Abstract

pub_date

1990-05-28 00:00:00

pages

21-5

issue

1

eissn

0303-7207

issn

1872-8057

pii

0303-7207(90)90070-O

journal_volume

71

pub_type

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