Newly discovered effects of vitamin D on cancer

Newly discovered effects of vitamin D on cancer


Vitamin D slows the progression of cells from premalignant to malignant states, keeping their proliferation in check

Published: 22 Nov 2012



A team of researchers at McGill University have discovered a
molecular basis for the potential cancer preventive effects of vitamin
D. The team, led by McGill professors John White and David Goltzman, of
the Faculty of Medicine’s Department of Physiology, discovered that the
active form of vitamin D acts by several mechanisms to inhibit both the
production and function of the protein cMYC. cMYC drives cell division
and is active at elevated levels in more than half of all cancers. Their
results are published in the latest edition of Proceedings of the National Academy of Sciences.

Although vitamin D can be obtained from limited dietary sources and
directly from exposure to the sun during the spring and summer months,
the combination of poor dietary intake and sun avoidance has created
vitamin D deficiency or insufficiency in large proportions of many
populations worldwide. It is known that vitamin D has a wide range of
physiological effects and that correlations exist between insufficient
amounts of vitamin D and an increased incidence of a number of cancers.
These correlations are particularly strong for cancers of the digestive
tract, including colon cancer, and certain forms of leukemia.

“For years, my lab has been dedicated to studying the molecular
mechanisms of vitamin D in human cancer cells, particularly its role in
stopping their proliferation,” said Prof. White. “We discovered that
vitamin D controls both the rate of production and the degradation of
cMYC. More importantly, we found that vitamin D strongly stimulates the
production of a natural antagonist of cMYC called MXD1, essentially
shutting down cMYC function”.

The team also applied vitamin D to the skin of mice and observed a
drop in the level of cMYC and found evidence of a decrease in its
function. Moreover, other mice, which lacked the specific receptor for
vitamin D, were found to have strongly elevated levels of cMYC in a
number of tissues including skin and the lining of the colon.

“Taken together, our results show that vitamin D puts the brakes on
cMYC function, suggesting that it may slow the progression of cells from
premalignant to malignant states and keep their proliferation in check.
We hope that our research will encourage people to maintain adequate
vitamin D supplementation and will stimulate the development of large,
well-controlled cancer chemoprevention trials to test the effects of
adequate supplementation,” said Dr. White.

This work was funded by the Canadian Institutes of Health Research
and the National Cancer Institute/Canadian Cancer Society Research
Institute.
Source:-
http://www.mcgill.ca/newsroom/channels/news/newly-discovered-effects-vitamin-d-cancer-219089