Scientists Discover New Class of Anti-Diabetes Compounds that Reduce Liver Glucose Production

15/06/2017

Scientists Discover New Class of Anti-Diabetes Compounds that Reduce Liver Glucose Production JUPITER, FL March 27, 2017 Scientists may have found a new tool for studying and maybe even treating Type 2 diabetes, the form of diabetes considered responsible for close to 95 percent of cases in the United States.

A team of scientists from the Florida campus of The Scripps Research Institute (TSRI), Dana-Farber Cancer Institute, Harvard Medical School and the Yale University School of Medicine, among others, have identified a new class of compounds that reduce production of glucose in the liver. One of these compounds, designed and optimized by TSRI scientists, significantly improves the health of diabetic animal models by reducing glucose levels in the blood, increasing insulin sensitivity and improving glucose balance.

The study, published recently in the journal Cell, was led by Pere Puigsever of Harvard Medical School and the Dana-Farber Cancer Institute and included Patrick Griffin, co-chair of the TSRI Department of Molecular Medicine, and Theodore Kamenecka, TSRI Associate Professor of Molecular Medicine.

The compound they identified, called SR-18292, modifies a protein known as PGC-1 . This protein plays a pivotal role in energy balance and helps control genes involved in energy metabolism. When cells overexpress PGC-1, during fasting or starvation, for example, glucose production in the liver soars. But when scientists modify PGC-1 function through a process called acetylation, glucose production declines.

This protein was generally considered non-druggable, said Griffin. But the team approached the problem through the process of acetylation, which means we can influence the protein's behavior indirectly. SR-18292 increases acetylation of PGC-1, which in turn shuts down glucose production in liver cells.

Suppressing this overproduction makes PGC-1 a target ripe for exploitation in anti-diabetes treatments.

After the screening process found several potential candidates, the TSRI team designed derivatives of those initial hits, Griffin said. We selected this compound based on its ability to induce acetylation and the fact that it had good pharmaceutical properties so we could use it in animal models of Type 2 diabetes.

While it isn't known at this point what protein or enzyme is directly targeted by SR-18292, Griffin explained, this new compound, plus several others we've made, can be used as chemical tools to study the regulation of glucose metabolism. The researchers added that these same small molecules could one day be developed as either a single agent to treat diabetes, or used in combination with current anti-diabetic drugs.

The first author of the study, Small Molecule Screen Identifies Selective PGC-1 Gluconeogenic Inhibitors that Ameliorate Type 2 Diabetes, is Kfir Sharabi of Dana-Farber and Harvard Medical School. Other authors include Hua Lin of TSRI; Clint D. J. Tavares, John E. Dominy and Amy K. Rines of Dana-Farber and Harvard Medical School; Mark P. Jedrychowski and Steve P. Gygi of Harvard Medical School; Joao Paulo Camporez and Rachel J. Perry of Howard Hughes Medical Institute and Yale University; Jaemin Lee and Umut Ozcan of Boston Childrens Hospital, Harvard Medical School; Marc Hickey, Melissa Bennion, Michelle Palmer, Partha P. Nag, Josh A. Bittker and Jos Perez of the Broad Institute of MIT and Harvard University.

The study was supported by the National Institutes of Health (grants F32 DK102293-01, U54HG005032, R24DK080261, R01DK-409369, 2U2CDK059635, R03DA032468 and R01 DK069966), the American Heart Association (15POST22880002) and the American Diabetes Association (1-16-PDF-111 and 7-12-MN-68).

About The Scripps Research Institute

The Scripps Research Institute (TSRI) is one of the worlds largest independent, not-for-profit organizations focusing on research in the biomedical sciences. TSRI is internationally recognized for its contributions to science and health, including its role in laying the foundation for new treatments for cancer, rheumatoid arthritis, hemophilia, and other diseases. An institution that evolved from the Scripps Metabolic Clinic founded by philanthropist Ellen Browning Scripps in 1924, the institute now employs more than 2,500 people on its campuses in La Jolla, CA, and Jupiter, FL, where its renowned scientists including two Nobel laureates and 20 members of the National Academies of Science, Engineering or Medicine work toward their next discoveries. The institutes graduate program, which awards PhD degrees in biology and chemistry, ranks among the top ten of its kind in the nation. In October 2016, TSRI announced a strategic affiliation with the California Institute for Biomedical Research (Calibr), representing a renewed commitment to the discovery and development of new medicines to address unmet medical needs. For more information, see www.scripps.edu.

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