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New model taps tiny, common tropical fish for large-scale drug screening to combat Cushing disease
Date:5/10/2011

LOS ANGELES (May 9, 2011) A common, tiny tropical fish plays a key role in a new model for Cushing disease, giving researchers a powerful tool to conduct extensive searches for effective treatments for this serious hormonal disorder, testing up to 300 drugs weekly.

The model published online on May 2 by the Proceedings of the National Academy of Sciences -- was created in the laboratory of Shlomo Melmed, MD, dean of the medical faculty at Cedars-Sinai Medical Center, by his research team led by Ning-Ai Liu, MD, PhD.

They introduced into striped zebrafish the freshwater translucent tropical Danio rario -- the "pituitary tumor transforming gene" discovered in Melmed's lab in 1997. This caused the zebrafish to develop features of Cushing disease including: high levels of the stress-related hormone cortisol; diabetes; and heart disease. These zebrafish then were bred with fish that bear green fluorescent markers, allowing researchers to visualize in the resulting hybrids how drugs interact with the Cushing's disease pituitary tumors.

"This new model for Cushing disease means that we can more rapidly and effectively identify drugs that could be successful in fighting these tumors," Melmed said. "With no current drug therapies and limited options available to Cushing patients, it is our hope that our research will enable medical advances that will revolutionize how this disease is treated."

Cushing Disease often is caused by a pituitary tumor that triggers overproduction of a hormone, which, in turn, stimulates the adrenal gland to overproduce cortisol, affecting nearly every area of the body including the regulation of blood pressure and metabolism. This leads to serious health problems, including diabetes, hypertension, osteoporosis, obesity (especially with a distinctive moon face and fatty tissue deposits in the midsection, upper back and between the shoulders) and cardiovascular disease.

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Contact: Nicole White
nicole.white@cshs.org
310-423-5215
Cedars-Sinai Medical Center
Source:Eurekalert

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