The compounds - resveratrol - which are found in grape skins and seeds, could also eventually lead to treatments to help prevent colon cancer, according to researchers from Penn State University. The compounds - resveratrol - which are found in grape skins and seeds, could also eventually lead to treatments to help prevent colon cancer, according to researchers.
The combination of resveratrol and grape seed extract is very effective at killing colon cancer cells. The researchers, who reported their findings in a recent issue of BMC Complementary and Alternative Medicine, suggest that the findings could pave the way for clinical testing of the compounds on human colon cancer, which is the second most common cancer in women and the third in men. If successful, the compounds could then be used in a pill to help prevent colon cancer and lessen the recurrence of the disease in colon cancer survivors.
Cancer stem cells are capable of self-renewal, cellular differentiation and maintain their stem cell-like characteristics even after invasion and metastasis.
When taken separately in low doses, resveratrol and grape seed extract are not as effective against cancer stem-cell suppression as when they are combined together, according to the researchers.
The combined effect of grape seed extract and resveratrol may offer clues as to why cultures with a plant-based diet tend to have lower colon cancer rates. These diets may naturally be providing a shotgun approach to cancer prevention by using a wide variety of beneficial compounds to target multiple pathways that cancer stem cells use to survive.
If successful in human trials, the compounds could be taken in low doses using currently available supplements for grape seed extract and resveratrol, which are also found in wine.
However, he added that there is still more work to do to understand the mechanism behind the anti-cancer properties of the grape extract, as well as other colorful fruits and vegetables. Further research would be aimed at finding specific anti-cancer compounds and better understanding how those compounds work synergistically to create more effective colon-cancer prevention and treatment strategies.
For the animal study, the researchers separated 52 mice with colon cancer tumors into three groups, including a control group and groups that were fed either the grape compounds or sulindac, an anti-inflammatory drug, which was chosen because a previous study showed it significantly reduced the number of tumors in humans.
The incidence of tumors was suppressed in the mice consuming the grape compounds alone by 50 percent, similar to the rate in the group consuming the diet with sulindac.