Plant-Based Fat Inhibits Growth Of Breast-Cancer Cell Line, UB Researchers Show

BUFFALO, N.Y. -- A plant-based fat abundant in vegetarian diets and shown to inhibit the growth of prostate and colon cancer cells in vitro, also inhibits the growth in vitro of one line of breast-cancer cells, University at Buffalo nutrition researchers have found.

The study, presented at the annual meeting of the Federation of American Societies of Experimental Biology earlier this month, showed that the phytosterol B-sitosterol reduced the number of breast-cancer cells grown in a laboratory setting by 66 percent, compared to controls.

"These results go hand-in-hand with our findings on prostate and colon cancer," said Atif Awad, Ph.D., director of UB's Nutrition Program and senior researcher on the study. He noted, however, that researchers haven't identified how B-sitosterol inhibits breast-cancer cell growth, but they do know it does not appear to be the same mechanism that is at work in prostate and colon cancer cells. "The effect of B-sitosterol apparently varies with the type of tissue," Awad said.

Awad is an associate professor in the Department of Physical Therapy, Exercise and Nutrition Sciences in the UB School of Health Related Professions.

He and colleagues at UB have been trying to understand the mechanisms responsible for vegetarians' lower rates of hormone-dependent cancers, and for the lower mortality rate from such cancers in Asian countries, where populations eat little meat.

With fats known to play a role in the development of several cancers, Awad's group has been focusing on the phytosterols for possible answers. He reported at an international conference on cancer research in Greece last October that the phytosterol B-sitosterol appears to play a role in inhibiting the growth of human prostate-cancer cells by strengthening an intracellular signaling system that inhibits cell division.

An earlier study by Awad published in 1998 in the Journal of Nutrition

Contact: Lois Baker
University at Buffalo

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