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Drug dials down the energy within cells, UM researchers find

A drug effective at treating animal models of human autoimmune disorders and other diseases works by dialing down the activity of a key enzyme involved in energy production, University of Michigan researchers have found.

"Many drugs block the function of enzymes, essentially turning them off," said Gary Glick, who is the Werner E. Bachmann Collegiate Professor of Chemistry at U-M. "Our compound works more like a volume control, so we're able to dial enzyme activity down to a level that maintains normal function while simultaneously allowing for initiation of a process that selectively kills or disables disease-causing cells."

Glick and collaborators published their findings in the June 16 issue of ACS Chemical Biology.

The drug, discovered by Glick and coworkers and called benzodiazepine-423 (Bz-423), is a chemical cousin of anti-anxiety medications such as Valium and Xanax. In previous work, Glick's group showed that Bz-423 reduces effects of arthritis and the autoimmune disease lupus in mice and may be useful in treating psoriasis. Unlike conventional drugs for these conditions, which can't discriminate between healthy and disease-causing cells, Bz-423 is highly selective, homing in on disease-causing cells.

In an attempt to better exploit its therapeutic properties, the researchers have been studying the details of Bz-423's activity. They learned that the compound targets an enzyme inside mitochondria, the energy factories of cells. The specific enzyme, F1F0-ATPase, is responsible for producing most of the cell's ATP. That's a critical role because ATP, often referred to as the cell's energy currency, is the molecule that captures chemical energy from food and transfers it to energy-demanding processes, such as muscle contraction and the transmission of nerve signals.

"People had proposed in the past that if you could inhibit this enzyme, there might be therapeutic potential. But the problem is, if you inhibit the enzyme in
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Source:University of Michigan


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