Adipokines and the insulin resistance syndrome in familial partial lipodystrophy caused by a mutation in lamin A/C

Familial partial lipodystrophy (FPLD) and obesity are both associated with increased risks of type 2 diabetes and cardiovascular disease. Although adipokines have been implicated, few data exist in subjects with FPLD; therefore we investigated a family with FPLD due to a lamin A/C mutation in order to determine how abnormalities of the plasma adipokine profile relate to insulin resistance and the metabolic syndrome.

Plasma levels of adiponectin, leptin, resistin, IL-1β, IL-6 and TNF-α in 30 subjects (ten patients, 20 controls) were correlated with indices of metabolic syndrome.

Compared with controls, FPLD patients had significantly lower plasma levels of adiponectin (3.7±1.0 in FDLP cases vs 7.1±0.72 μg/ml in controls, p=0.02), leptin (1.23±0.4 vs 9.0±1.3 ng/ml, p=0.002) and IL-6 (0.59±0.12 vs 1.04±0.17 pg/ml, p=0.047) and elevated TNF-α (34.8±8.1 vs 13.7±2.7 pg/ml, p=0.028), whereas IL-1β and resistin were unchanged. In both groups, adiponectin levels were inversely correlated with body fat mass (controls, r=−0.44, p=0.036; FDLP, r=−0.67, p=0.025), insulin resistance (controls, r=−0.62, p=0.003; FDLP, r=−0.70, p=0.025) and other features of the metabolic syndrome. TNF-α concentrations were positively related to fat mass (controls, r=0.68, p=0.001; FDLP, r=0.64, p=0.048) and insulin resistance (controls, r=0.86, p=0.001; FDLP, r=0.75, p=0.013). IL-6, IL-1β and resistin did not demonstrate any correlations with the metabolic syndrome in either group.

Low adiponectin and leptin and high TNF-α were identified as the major plasma adipokine abnormalities in FPLD, consistent with the hypothesis that low adiponectin and high TNF-α production may be mechanistically related, and perhaps responsible for the development of insulin resistance and cardiovascular disease in FPLD.