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Elevated circulating adiponectin in type 1 diabetes is associated with long diabetes duration
Author(s) -
Lindström Torbjörn,
Frystyk Jan,
Hedman Christina A.,
Flyvbjerg Allan,
Arnqvist Hans J.
Publication year - 2006
Publication title -
clinical endocrinology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.055
H-Index - 147
eISSN - 1365-2265
pISSN - 0300-0664
DOI - 10.1111/j.1365-2265.2006.02666.x
Subject(s) - adiponectin , medicine , endocrinology , interquartile range , diabetes mellitus , c peptide , type 1 diabetes , type 2 diabetes , univariate analysis , insulin resistance , multivariate analysis
Summary Objective To study circulating adiponectin concentrations in relation to diabetes duration and endogenous insulin secretion in patients with type 1 diabetes. Patients Patients with haemoglobin A1c (HbA1c) < 6% (reference range 3·6–5·4%) were selected for the study. Twenty‐two men and 24 women [age 41·3 ± 13·8 years (mean ± SD), diabetes duration 4 months to 52 years] participated. Healthy controls (15 women and nine men, age 41·3 ± 13·0 years) were also included. Overnight fasting serum samples were analysed for adiponectin, HbA1c, C‐peptide and lipoproteins. Results Significant positive associations were found between adiponectin concentrations and diabetes duration in univariate and multiple regression analyses. Serum adiponectin averaged 9·7 ± 5·3 [median 8·1, interquartile range (IQR) 3·6] mg/l in patients with diabetes duration less than 10 years and 17·8 ± 10·7 (median 14·7, IQR 7·5) mg/l in patients with longer duration ( P = 0·0001). Among the patients, 24 were without detectable (< 100 pmol/l) and 22 with detectable C‐peptide levels (185 ± 91 pmol/l). C‐peptide levels in controls averaged 492 ± 177 pmol/l. HbA1c was 5·7 ± 0·6% in patients without detectable C‐peptide and 5·6 ± 0·4% in patients with detectable C‐peptide (ns). Serum adiponectin was higher in patients without detectable C‐peptide than in patients with detectable C‐peptide [17·3 ± 11·1 vs. 10·6 ± 5·8 mg/l ( P < 0·005)] and in the controls [10·1 ± 2·9 mg/l ( P < 0·001 vs. patients without detectable C‐peptide)]. Conclusions The increase in circulating adiponectin concentrations in patients with type 1 diabetes appears to be strongly associated with long diabetes duration, irrespective of the metabolic control. Among other factors, a putative role for residual β‐cell function in the regulation of circulating adiponectin levels can be considered but we did not find sufficient evidence for this in the present study.