Imatinib Improves Insulin Sensitivity, Promotes Browning of White Fat
Imatinib improves insulin sensitivity without negative effects seen with other PPAR-gamma targeting drugs.
(HealthDay News) — Imatinib (Gleevec) blocks CDK5-mediated peroxisome proliferator-activated receptor-gamma (PPAR-gamma) phosphorylation as an antagonist ligand, improving insulin sensitivity and promoting browning of white adipose tissue, according to a study published in Diabetes.
Sunsil Choi, from the Ulsan National Institute of Science and Technology in South Korea, and colleagues used high throughput phosphorylation screening to describe the mechanism of action of imatinib.
The researchers note that imatinib blocks CDK5-mediated PPAR-gamma phosphorylation acting as a PPAR-gamma antagonist ligand. Imatinib improved insulin sensitivity in high fat-fed mice, without causing severe side effects associated with other PPAR-gamma-targeting drugs. Imatinib was also found to reduce lipogenic and gluconeogenic gene expression in the liver and improved inflammation in adipose tissues.
Increased browning of white adipose tissue and energy expenditure were also seen with imatinib.
"Taken together, Gleevec exhibits greater beneficial effects on both glucose/lipid metabolism and energy homeostasis by blocking PPAR-gamma phosphorylation," the researchers wrote. "These data illustrate that Gleevec could be a novel therapeutic agent for use in insulin resistance and type 2 diabetes."
One author was employed by Hyundai Pharm Co.