The tumour necrosis factor alpha -238 G --> A and -308 G --> A promoter polymorphisms are not associated with insulin sensitivity and insulin secretion in young healthy relatives of Type II diabetic patients.
Diabetologia 2000;
43:181-4. [PMID:
10753039 DOI:
10.1007/s001250050027]
[Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
AIMS/HYPOTHESIS
Tumour necrosis factor-alpha (TNF-alpha) is believed to influence skeletal muscle insulin resistance. Two G --> A transitions in the promoter region of TNF-alpha at position -238 and -308 have been identified that could play a part in transcriptional regulation of the gene. Insulin resistance is an independent familial trait that predicts the development of Type II (non-insulin-dependent) diabetes mellitus. We investigated the influence on insulin sensitivity and insulin secretion of both polymorphisms in a cohort of young healthy relatives of patients with Type II diabetes.
METHODS
We examined 109 first-degree relatives of Caucasian patients with a history of Type II diabetes, who underwent extensive metabolical and anthropometrical phenotyping, and determined the TNF-alpha -238 and -308 G --> A promoter polymorphisms.
RESULTS
For the -238 polymorphism, 3 probands (76.1%) were homozygous for the G-allele, 25 probands (22.9%) were heterozygous and 1 proband (0.9%) was homozygous for the A-allele. For the -308 polymorphism, 83 probands (76.1%) were homozygous for the G-allele, 24 probands (22.0%) were heterozygous and 2 probands (1.18%) were homozygous for the A-allele. Probands with and without the polymorphism did not differ in insulin sensitivity (p = 0.78), insulin-concentrations and C-peptide concentrations in oral glucose tolerance tests (p > 0.05).
CONCLUSIONS/INTERPRETATION
We could not detect an association between insulin sensitivity or insulin secretion and TNF-alpha promoter polymorphisms in our cohort. The polymorphisms occur at the same frequencies in probands with either low or high insulin sensitivity.
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