Na+/H+ antiporter activity in peripheral blood lymphocytes of obese and type 2 diabetic patients is increased only in the presence of arterial hypertension.

Abstract:

:The aim of this work is to evaluate whether type 2 diabetes mellitus, obesity and arterial hypertension, three conditions characterized by the presence of insulin resistance, share some common genetic markers. A potential candidate is the Na+/H+ antiporter, the increased activity of which is considered a marker of essential hypertension. This ion exchanger seems to be related to the Na+/Li+ countertransport, that is considered a marker of insulin resistance in essential hypertension and in type 1 diabetes mellitus. In this study we wished to clarify whether the activity of the Na+/H+ antiporter is increased not only in hypertensive subjects, but also in obese and type 2 diabetic patients, both in the presence and in the absence of arterial hypertension. The activity of the ion exchanger was measured in peripheral blood lymphocytes (PBL) by clamping intracellular pH (pHi) at 5.8-6.2 and then detecting the rate of the proton efflux after sodium addition. In the absence of arterial hypertension, no significant difference in this parameter was observed in obese and type 2 diabetic patients in comparison with normal subjects. In the presence of arterial hypertension, there was a significant increase in the Na(+)-induced H+ efflux at the internal pH (pHi) values of 5.8 and 6.2 both in hypertensive controls and in hypertensive obese and type 2 diabetic patients (P = 0.05-0.0001 vs. normotensive subjects and patients).(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Eur J Clin Invest

authors

Ghigo D,Alessio P,Burzacca S,Costamagna C,Anfossi G,Cavalot F,Bosia A,Trovati M

doi

10.1111/j.1365-2362.1994.tb00983.x

subject

Has Abstract

pub_date

1994-03-01 00:00:00

pages

166-72

issue

3

eissn

0014-2972

issn

1365-2362

journal_volume

24

pub_type

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