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Dysregulation of glucose transport in hearts of genetically obese (fa/fa) rats.

Abstract：

:Overall D-glucose metabolism and 3-0-methylglucose transport were measured in the perfused heart preparation of lean and genetically obese (fa/fa) rats. Absolute values of basal and insulin-stimulated glucose metabolism were decreased in hearts of 15-week-old obese rats when compared to lean age-matched controls. Basal and maximally stimulated (i.e., by the combined addition of insulin and increasing perfusion pressure) 3-0-methylglucose transport was normal in hearts from young obese rats (5-week-old). However, when only one stimulus was used (insulin or increasing perfusion pressure alone), 3-0-methylglucose transport was stimulated to values that were lower than those of lean rats. Basal 3-0-methylglucose transport was four times lower in hearts from older obese rats (15-week-old) than in lean ones of the same age. At this age, stimulation of 3-0-methylglucose transport by insulin alone, by increasing perfusion pressure alone or by the combination of both stimuli, reached values in obese rats that were only half those of lean animals. It is concluded that: (a) in the early phase of the syndrome, the basal glucose transport system in hearts of obese rats is normal, but its response to stimulation becomes abnormal and; (b) at a later phase of obesity, the glucose transport system becomes abnormal even under basal conditions and its responsiveness to various stimuli is markedly impaired.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Zaninetti D,Crettaz M,Jeanrenaud B

doi

10.1007/BF00284464

subject

Has Abstract

pub_date

1983-12-01 00:00:00

pages

525-9

issue

6

eissn

0012-186X

issn

1432-0428

journal_volume

25

pub_type

杂志文章

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