High molecular weight adiponectin was significantly lower in coronary artery disease patients and specifically suppressed endothelial cell apoptosis in vitro.
Does the high molecular weight form of adiponectin suppress endothelial cell apoptosis and correlate with vascular-protective states?
The high molecular weight form of adiponectin appears to be the active isoform responsible for its vascular-protective, antiapoptotic effects on endothelial cells.
Adiponectin is an adipocyte-derived, antiatherogenic protein that is present in serum as three isoforms. Total adiponectin levels are decreased in obese or diabetic humans or animal models. This study was designed to elucidate the relative isoform distribution of adiponectin in human disease states and identify the active form of adiponectin toward vascular endothelial cells. The percentage of high molecular weight form (HMW) per total adiponectin was significantly lower in patients with coronary artery disease than control subjects, whereas the hexamer form was similar and the trimer form was significantly higher. During weight reduction in obese subjects, the HMW form increased and the trimer and hexamer forms decreased. Recombinant adiponectin dose-dependently suppressed apoptosis and caspase-3 activity in human umbilical vein endothelial cells (HUVECs). Transduction with dominant-negative AMP-activated protein kinase (AMPK) abolished the suppressive effect of adiponectin on HUVECs. Gel filtration chromatography was used to separate the adiponectin isoforms, and the antiapoptotic effect toward HUVECs was only observed with the HMW form. These data suggest that HMW adiponectin specifically confers the vascular-protective activities of this adipocytokine. The full text of this article is available online at http://circres.ahajournals.org.
Kobayashi et al. (Tue,) conducted a other in Coronary artery disease and obesity. High molecular weight (HMW) adiponectin vs. Control subjects / other adiponectin isoforms was evaluated on Isoform distribution of adiponectin and endothelial cell apoptosis. High molecular weight adiponectin was significantly lower in coronary artery disease patients and specifically suppressed endothelial cell apoptosis in vitro.