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Scientists discover how rapamycin slows cell growth
Date:5/23/2013

This news release is available in French.

University of Montreal researchers have discovered a novel molecular mechanism that can potentially slow the progression of some cancers and other diseases of abnormal growth. In the May 23 edition of the prestigious journal Cell, scientists from the University of Montreal explain how they found that the anti-cancer and anti-proliferative drug rapamycin slows down or prevents cells from dividing.

"Cells normally monitor the availability of nutrients and will slow down or accelerate their growth and division accordingly. A key monitor of nutrients is a protein called the Target of Rapamycin (TOR), but we do not know the details of how this protein feeds signals downstream to control growth says Dr. Stephen Michnick, senior author and a University of Montreal biochemistry professor. He adds that, "we were surprised to find that TOR hooks up to a circuit that controls the exit of cells from division which in turn modulates the RNA message that codes for a key cell cycle regulator called B-cyclin".

In collaboration with Daniel Zenklusen, also a University of Montreal biochemistry professor and lead author and doctoral candidate Vincent Messier, discovered that when cells are starved for nutrients TOR sends a signal to shut down production of a chemical message in the form of RNA to synthesize B cyclin ", Dr. Michnick explained. "We also found that TOR acts through a previously unforeseen intermediary, a protein that makes small chemical modifications to proteins normally stabilize B cyclin ", he added. "We have known that starvation and a drug that mimics starvation, rapamycin, affects B cyclin synthesis, but we didn't know how. Our studies now point to one mechanism", noted Dr. Messier.

Dr. Zenklusen emph
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Contact: Julie Gazaille
j.cordeau-gazaille@umontreal.ca
514-343-6796
University of Montreal
Source:Eurekalert

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