Printer Friendly

Jamming prostate cancer's transmission.

Though most prostate cancers do not metastasize, seeding new tumors throughout the body, those that do become incurable. But data from a new animal study suggest the possibility of one day checking this cancer's potentially lethal spread with a nontoxic, fruit-derived dietary supplement.

The promising agent? Fragments of pectin -- the gelling powder used for generations to set jams and jellies.

Three years ago, researchers at Wayne State University in Detroit chopped up branched molecules of citrus pectin to make linear, twiglike arrays of the sugar galactose. The fragments, they found, could bind to lectins, galactose-seeking proteins on the surface of cancer cells.

Ordinarily, lectins foster a cancer cell's adhesion to the blood vessel wall of any organ it attempts to colonize. By binding those lectins to pectin instead, the researchers had hoped to keep circulating cancer cells in the bloodstream until they died or could be eliminated.

And the strategy worked when researchers injected pectin fragments into mice along with cells from a deadly skin cancer (SN: 3/21/92, p.180). Neither untreated pectin nor galactose alone has proved antimetastatic.

Now the Wayne State team has turned its attention to prostate cancer. Why? Research has shown that when prostate cells turn cancerous, they elevate their production of galactose-binding lectins, notes study leader Kenneth J. Pienta, now at the University of Michigan in Ann Arbor.

In the March 1 Journal of the National Cancer Institute, his team reports that rats drinking pectin-supplemented water developed prostate metastases to the lung at about half the rate of rats drinking plain water. Moreover, Pienta points out, even when metastases did appear in the highest dose group (whose water contained 1 percent by weight of modified pectin), only about one-tenth as many nascent tumors developed as formed in other animals with metastases.

The nontoxic pectin doesn't affect the growth of established tumors. Rather, assays by Pienta's team suggest, pectin fragments indeed thwart metastasis by preventing tumor cells from adhering to blood vessel walls. Most encouraging, Pienta told Science News, "we have demonstrated in our [assays] that the modified pectin appears to block several different types of cancer from adhering to blood vessels -- including breast cancer, lung cancer, melanoma, kidney, and others."

"We would therefore predict that this [pectin supplementation] would work for just about any cancer -- not just prostate," he says. His group has sent samples of the modified pectin to the National Cancer Institute for additional antimetastasis testing.

In the meantime, Pienta cautions cancer victims against attempting to medicate themselves with pectin. In its off-the-shelf form, he notes, "it's just a dietary fiber and will act like Metamucil. It's only our modification that allows it to be absorbed."
COPYRIGHT 1995 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1995, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:fragments of pectin may block spread of cancer to other areas of the body
Author:Raloff, Janet
Publication:Science News
Article Type:Brief Article
Date:Mar 4, 1995
Previous Article:Deep heat unites the volcanoes of Europe.
Next Article:People with HIV get immune-reviving drug.

Related Articles
Pectin helps fight cancer's spread.
The neglected sex gland: a protein in the blood forecasts cancer of the prostate.
Gene copying aids prostate tumor growth.
Gene blocks prostate cancer's journey.
Radical prostates: female hormones may play a pivotal role in a distinctly male epidemic.
Understanding Cancer's Spread.
Prostate cancer--you can't run away.
Predicting prostate cancer's moves: new tests could refine therapy decisions.
Collet-Sicard syndrome: an uncommon manifestation of metastatic prostate cancer.

Terms of use | Copyright © 2017 Farlex, Inc. | Feedback | For webmasters