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Insulin receptor tyrosine-kinase activity is altered in both muscle and adipose tissue from non-obese normoglycaemic insulin-resistant subjects.

Abstract：

:We performed i.v. insulin tolerance test in 30 non-obese (BMI < 30 male and < 28 female) non-diabetic (by oral glucose tolerance test) subjects and subdivided them into three groups of 10 subjects each, according to their insulin sensitivity (K(itt) values). Then we compared the tyrosine-kinase activity of immunopurified insulin receptors (using 32P-ATP and poly-glu-tyr (4:1) from both muscle and adipose tissue in 7 of the most insulin-sensitive and 7 of the most insulin-resistant subjects. No difference was observed between the two groups in the basal (no insulin) receptor tyrosine-kinase activity from both tissues. In contrast, tyrosine-kinase activity response to insulin was significantly higher (p < 0.05 by 2-way ANOVA test) in receptors from both tissues of insulin-sensitive subjects. In addition, a decreased tyrosine-kinase sensitivity to insulin was observed in muscle, but not adipose, tissue of insulin-resistant subjects (insulin ED50 being 0.87 +/- 0.05 nmol/l vs 2.03 +/- 0.07, p < 0.05 in insulin-sensitive and -resistant subjects). Insulin ED50 of muscle receptor tyrosine-kinase significantly (p = 0.001) correlated to both K(itt) values (r = -0.79) and plasma insulin values at 120 min during OGTT (r = + 0.80). Insulin receptor content, as assessed by radioimmunoassay, was similar in both muscle (7.9 +/- 1.3 and 9.2 +/- 1.9 ng/mg protein) and adipose tissue (8.2 +/- 1.3 and 7.5 +/- 1.4) of insulin-sensitive and -resistant subjects.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Diabetologia

journal_title

Diabetologia

authors

Grasso G,Frittitta L,Anello M,Russo P,Sesti G,Trischitta V

doi

10.1007/BF02369353

subject

Has Abstract

pub_date

1995-01-01 00:00:00

pages

55-61

issue

1

eissn

0012-186X

issn

1432-0428

journal_volume

38

pub_type

杂志文章

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