Bethesda, MDA new research discovery by a team of Stanford and European scientists offers hope that people with atherosclerotic disease may one day be able to avoid limb amputation related to ischemia. A new research report appearing online in the FASEB Journal suggests that the delivery of genes for two molecules naturally produced by the body, called "PDGF-BB" and "VEGF" may successfully cause the body to grow new blood vessels that can save ischemic limbs.
"We hope that our findings will ultimately develop into a safe and effective therapy for the many patients, suffering from blocked arteries in the limbs, who are currently not adequately treated by surgery or drugs," said Helen M. Blau, Ph.D., a senior researcher involved in the work and Associate Editor of the FASEB Journal from the Baxter Laboratory for Stem Cell Biology at the Institute for Regenerative Medicine and Stem Cell Biology at Stanford. "This could help avoid the devastating consequences of limb amputations for both patients and their families."
To make this discovery, Blau and colleagues, including Andrea Banfi (now at Basel University), introduced the genes for PDGF-BB and VEGF into the muscles of mice, either independently or together. When high doses of VEGF alone were produced, they caused the growth of vascular tumors. When the two factors were produced in unbalanced amounts, tumor growth also occurred. When VEGF and PDGF were delivered in a fixed ratio relative to one another, however, no tumors occurred, and blood flow was restored to ischemic muscle tissue and damage repaired without any toxic effects. To achieve a "balanced" delivery of PDGF-BB and VEGF, scientists placed both genes in a single gene therapy delivery mechanism, called a "vector."
Although the report shows the feasibility of growing robust and safe new blood vessels that restore blood flow to diseased tissues, Blau points out that "there a
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Federation of American Societies for Experimental Biology