Evidence of a causal relationship between adiponectin levels and insulin sensitivity: a Mendelian randomization study.

Abstract:

:The adipocyte-secreted protein adiponectin is associated with insulin sensitivity in observational studies. We aimed to evaluate whether this relationship is causal using a Mendelian randomization approach. In a sample of Swedish men aged 71 years (n = 942) from the Uppsala Longitudinal Study of Adult Men (ULSAM), insulin sensitivity (M/I ratio) was measured by the euglycemic insulin clamp. We used three genetic variants in the ADIPOQ locus as instrumental variables (IVs) to estimate the potential causal effect of adiponectin on insulin sensitivity and compared these with results from conventional linear regression. The three ADIPOQ variants, rs17300539, rs3774261, and rs6444175, were strongly associated with serum adiponectin levels (all P ≤ 5.3 × 10(-9)) and were also significantly associated with M/I ratio in the expected direction (all P ≤ 0.022). IV analysis confirmed that genetically determined adiponectin increased insulin sensitivity (β = 0.47-0.81, all P ≤ 0.014) comparable with observational estimates (β = 0.50, all P(difference) ≥ 0.136). Adjustment for BMI and waist circumference partly explained the association of both genetically determined and observed adiponectin levels with insulin sensitivity. The observed association between higher adiponectin levels and increased insulin sensitivity is likely to represent a causal relationship partly mediated by reduced adiposity.

journal_name

Diabetes

journal_title

Diabetes

authors

Gao H,Fall T,van Dam RM,Flyvbjerg A,Zethelius B,Ingelsson E,Hägg S

doi

10.2337/db12-0935

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

1338-44

issue

4

eissn

0012-1797

issn

1939-327X

pii

db12-0935

journal_volume

62

pub_type

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