Leucocyte intracellular pH and Na+/H+ antiport activity in human hypertension.

Abstract:

:Hypertension is associated with thickening of the wall of resistance vessels, but the cellular or genetic basis of this is unclear. Cell proliferation and intracellular alkalinization via increased Na+/H+ exchange are linked in the response of tissues to growth factors. To define a possible cellular basis for vascular medial thickening in hypertension, we studied leucocyte intracellular pH, buffering power and Na+/H+ antiport activity in 17 hypertensive and 17 age-, sex- and weight-matched normotensive subjects. The cells from hypertensive subjects were significantly more alkaline [median (range): 7.49 (7.26-7.95) versus 7.39 (7.25-7.53); P less than 0.01], and had a lower buffering power [8.95 (3.05-17.98) versus 12.57 (7.44-19.95) mmol/l per pH unit; P less than 0.02] than those from normotensive subjects. Moreover, the activity of the Na+/H+ antiport was higher when cells were acid-loaded to an intracellular pH of 6.7. The presence of a similar increased activity in vascular smooth muscle cells may be associated with increased cellular proliferation resulting in a thickened media or increased vascular smooth muscle contractility.

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Ng LL,Dudley C,Bomford J,Hawley D

doi

10.1097/00004872-198906000-00006

subject

Has Abstract

pub_date

1989-06-01 00:00:00

pages

471-5

issue

6

eissn

0263-6352

issn

1473-5598

journal_volume

7

pub_type

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