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UCSF researchers uncover hormone pathway to fatty liver disease
Date:3/1/2011

Scientists at the UCSF Cardiovascular Research Institute have discovered how a change in growth hormone activity in mice leads to fatty liver disease, a condition whose human counterpart is of rising concern worldwide.

Disruption of a key protein in the pathway that responds to growth hormone could explain how fatty liver disease develops, the researchers said, but may also offer insights into how our bodies regulate fat in general.

The team's findings and the first reports of a mouse model to study the pathway will appear in the April issue of the Journal of Clinical Investigation and online March 1 at www.jci.org.

Until recently, the growth of fat deposits in the liver that characterizes fatty-liver disease was mainly considered a result of alcoholism. Over the last decade, though, scientists have been baffled by the rising incidence of the non-alcoholic version of the disease, which now affects as many as one in four people worldwide, according to UCSF cardiologist Ethan Weiss, MD, senior author of the paper.

Known risk factors for the condition include obesity, diabetes and malnutrition, among many others, but its precise mechanism had eluded researchers.

"Fatty liver disease is an increasingly prevalent condition that is poorly understood," Weiss said. "We knew that growth hormone had been linked to fatty liver, but previous reports showed that it both causes and cures the condition. We set out to figure out why that happens."

The team focused on a protein in the liver known as JAK2. While better known as being linked to cancers such as blood cancers, this protein is also a key player in an important chemical pathway in the liver.

Normally, the pituitary gland secretes growth hormone, which communicates with JAK2 and sets off a series of steps to produce insulin-like growth factor 1 (IGF-1), an important mediator of growth and other effects. It was co
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Contact: Kristen Bole
kristen.bole@ucsf.edu
415-502-6397
University of California - San Francisco
Source:Eurekalert

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