The effect of oral glucose on the leucocyte sodium pump in normal and obese subjects.

Abstract:

:The effect of oral glucose (40 g/m2 body surface area) on the leucocyte 22Na efflux rate constants (ERC) was studied in 13 normal weight and 10 obese subjects. The ouabain-sensitive 22Na ERC was higher in leucocytes isolated from fasting obese subjects (median [range] for obese 2.77 [2.33-3.11] vs normals 1.91 [1.57-2.77] h-1, P less than 0.001). There was no difference in the ouabain-resistant 22Na ERC. Oral glucose raised the ouabain-sensitive 22Na ERC after 2 h in normal subjects (1.91 [1.57-2.77] to 2.41 [2.11-3.02] h-1, P less than 0.001). The ouabain-resistant 22Na ERC fell from 0.71 [0.32-1.10] to 0.46 [0.35-0.68] h-1, P less than 0.008. Conversely, in obese subjects, the ouabain-sensitive ERC fell (2.77 [2.33-3.11] to 2.59 [2.11-2.92] h-1, P less than 0.06). There was no significant change in ouabain-resistant 22Na ERC 2 h after oral glucose. The fasting leucocyte 22Na ouabain-sensitive ERC correlated with fasting plasma insulin levels and insulin resistance (rs = 0.48, P less than 0.01 for both). The change in this ERC with oral glucose correlated with the incremental insulin response over 2 h (rs = -0.53, P less than 0.006) and to the insulin resistance (rs = -0.56, P less than 0.003). The failure of oral glucose to stimulate the leucocyte sodium pump in obesity could partially account for the defect in dietary thermogenesis in obesity. This defect in stimulation of the sodium pump is related to insulin resistance.

journal_name

Clin Endocrinol (Oxf)

journal_title

Clinical endocrinology

authors

Ng LL,Hockaday TD

doi

10.1111/j.1365-2265.1987.tb01161.x

subject

Has Abstract

pub_date

1987-09-01 00:00:00

pages

345-53

issue

3

eissn

0300-0664

issn

1365-2265

journal_volume

27

pub_type

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