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30 March 2009

Dipeptidyl peptidase IV inhibitors: therapeutic potential in nonalcoholic fatty liver disease

Yusuf YilmazABDEFG, Ozlen AtugDEF, Oya YonalEF, Deniz DumanADE, Osman OzdoganD, Nese ImeryuzADF, Cem KalayciADF

Med Sci Monit 2009; 15(4): HY1-5 :: ID: 869596

Abstract

Nonalcoholic fatty liver disease is the most common chronic liver disease in industrialized countries and is considered the hepatic manifestation of metabolic syndrome. Apart from correction of underlying metabolic abnormalities, restriction of caloric intake, and physical exercise, no drugs have been licensed for the treatment of nonalcoholic fatty liver disease. Of note, reduced caloric intake and exercise with resultant weight loss may lead to a reduction in liver fat content, but no studies have shown long-term benefits of this. Dipeptidyl peptidase IV inhibitors are promising new oral drugs for the treatment of type 2 diabetes. Here, we hypothesize that dipeptidyl peptidase IV inhibitors can reduce fat infiltration in the liver and thus be a potential treatment for nonalcoholic fatty liver disease. There are 3 lines of evidence supporting this hypothesis. First, dipeptidyl peptidase IV inhibitors are known to improve insulin resistance, a key metabolic abnormality encountered by patients with nonalcoholic fatty liver disease. Second, patients with nonalcoholic steatohepatitis have increased dipeptidyl peptidase IV activity, which has been found to correlate positively with the histopathologic grade and degree of liver steatosis. Finally, data from experimental studies suggest that dipeptidyl peptidase IV inhibitors can reduce liver inflammation and steatosis. In light of these findings, we propose that pharmacologic inhibition of dipeptidyl peptidase IV may provide a new therapeutic option for slowing the progression of nonalcoholic fatty liver disease. Future research is expected to support the efficacy and tolerability of dipeptidyl peptidase IV modulation in early liver steatosis.

Keywords: Fatty Liver - drug therapy, Dipeptidyl-Peptidase IV Inhibitors - therapeutic use

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