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Study reveals new mechanism that might promote cancer's growth and spread in the body
Date:7/10/2012

  • Researchers have discovered a previously unknown mechanism that promotes the growth and spread of cancer.
  • The mechanism involves a new role for small regulatory molecules called microRNA.
  • The findings suggest a new strategy for treating cancer and perhaps diseases of the immune system.

COLUMBUS, Ohio Tiny vesicles released by tumors cells are taken up by healthy immune cells, causing the immune cells to discharge chemicals that foster cancer-cell growth and spread, according to a study by researchers at The Ohio State University Comprehensive Cancer Center Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (OSUCCC James) and at Children's Hospital in Los Angeles.

The study uses lung cancer cells to show that the vesicles contain potent regulatory molecules called microRNA, and that the uptake of these molecules by immune cells alters their behavior. The process in humans involves a fundamental receptor of the immune system called Toll-like receptor 8 (TLR8).

The findings, published in the early edition of the Proceedings of the National Academy of Sciences, suggest a new strategy for treating cancer and diseases of the immune system, the researchers say, and a new role for microRNA in the body.

"This study reveals a new function of microRNA, which we show binds to a protein receptor," says principal investigator Dr. Carlo Croce, director of Ohio State's Human Cancer Genetics program and a member of the OSUCCC James Molecular Biology and Cancer Genetics program. "This tells us that some cancer-released microRNAs can bind and activate a receptor in a hormone-like fashion, and this has not been seen before."

MicroRNAs help control the type and amount of proteins that cells make, and they typically do this by binding with the messenger-RNA that encodes a protein.

"In this study we discovered a completely new mechanism used by cancer to grow and spread, therefore
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Contact: Darrell E. Ward
Darrell.Ward@osumc.edu
614-293-3737
Ohio State University Medical Center
Source:Eurekalert

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