Abstract
Studies measuring circulating irisin levels in patients with insulin resistance conditions
such as type 2 diabetes mellitus (T2DM) and gestational diabetes mellitus (GDM) have
achieved controversial results. Our systematic review and meta-analysis aim to assess
the circulating irisin levels in patients with diabetes mellitus. Pubmed, EMBASE,
CENTRAL, ISI Web of Science, and CNKI were searched to identify observational studies
of circulating irisin levels in patients with diabetes mellitus. Two reviewers independently
searched the databases and screened studies according to the inclusion criteria. Data
were extracted using a standardized collection form. Meta-analysis was performed.
A total of 23 studies (17 cross-sectional and 6 case control) involving 1 745 diabetic
patients and 1 337 non-diabetic controls were selected. Compared with non-diabetic
controls, circulating irisin concentrations were significantly lower in patients with
T2DM (SMD −1.72, 95%CI −2.49, −0.96; p<0.00001) and GDM (SMD −0.76, 95CI −1.31, −0.22;
p=0.006), but 30 percent higher in patients with T1DM. Circulating irisin in Asian
diabetic patients decreased more than European patients. The findings of our current
review suggest that circulating irisin levels were decreased in patients with T2DM
and GDM, but not in patients with T1DM.
Key words
irisin - type 2 diabetes mellitus - gestational diabetes mellitus - systematic review