Abstract:
OBJECTIVE:Serum concentrations of soluble tumor necrosis factor-alpha (TNF-alpha) receptor 2 (sTNFR2) are associated with insulin resistance. In a recent study, we provided evidence for the existence of a biologically active form of sTNFR2 produced by alternative splicing (DS-TNFR2). We aimed to evaluate whether this circulating DS-TNFR2 is associated with insulin action in humans. DESIGN AND METHODS:Real time PCR (light cycler technology) evaluated DS-TNFR2 expression in monocytes. DS-TNFR2 was measured using a monoclonal antibody against an epitope present in TNFR2 (first 14 residues of the juxtamembrane region) but predicted to be absent in soluble proteolytic cleavage-produced TNFR2. Insulin sensitivity was measured using euglycemic hyperinsulinemic clamp (n = 76) and homeostatic model of assessment (HOMA) value in a replication study of 223 subjects. RESULTS:Real time PCR confirmed gene expression of DS-TNFR2 in monocytes from healthy subjects. A significant and positive association was found between serum DS-TNFR2 concentration and insulin sensitivity (P = 0.032, n = 76). This association was most significant in subjects with normal glucose tolerance (r = 0.44, P = 0.002). The subjects in whom DS-TNFR2 was detectable were more insulin sensitive than those with undetectable DS-TNFR2 (42.12+/-22.08 vs 31.71+/- 16.95 micromol x kg(-1) x min(-1), P = 0.039). DS-TNFR2 was inversely associated with body mass index, waist-to-hip ratio, systolic and diastolic blood pressure, fasting serum glucose, serum triglycerides and serum uric acid concentration and with the HOMA value (P = 0.03) in the replication study. Circulating DS-TNFR2 declined with increased number of components of the metabolic syndrome. CONCLUSION:Native sTNFR2 and DS-TNFR2 show opposite associations with insulin action. DS-TNFR2 might play a role as a counterpart of the proinflammatory environment associated with insulin resistance.
journal_name
Eur J Endocrinoljournal_title
European journal of endocrinologyauthors
Fernández-Real JM,Straczkowski M,Lainez B,Chacón MR,Kowalska I,López-Bermejo A,García-España A,Nikolajuk A,Kinalska I,Ricart Wdoi
10.1530/eje.1.02145subject
Has Abstractpub_date
2006-05-01 00:00:00pages
723-30issue
5eissn
0804-4643issn
1479-683Xpii
154/5/723journal_volume
154pub_type
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