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To fix diabetic nerve damage, blood vessels and support cells may be the real targets of treatment
Date:6/23/2011

Blood vessels and supporting cells appear to be pivotal partners in repairing nerves ravaged by diabetic neuropathy, and nurturing their partnership with nerve cells might make the difference between success and failure in experimental efforts to regrow damaged nerves, Johns Hopkins researchers report in a new study.

About 20 percent of diabetics experience neuropathy, a painful tingling, burning or numbness in the hands and feet that reflects damage to nerves and sometimes leads to infections and amputation of the toes, fingers, hands and feet over time. Current treatments for diabetic neuropathy focus on relieving symptoms, but don't address the root cause by repairing nerve damage. Previous research has shown that nerve cells' long extensions, known as axons, regenerate slowly in diabetics, scuttling various experiments to regrow healthy nerves, explains study leader Michael Polydefkis, M.D., M.H.S., associate professor of neurology at the Johns Hopkins University School of Medicine.

Searching for the reasons behind this slow regeneration, Polydefkis, along with Johns Hopkins assistant professor of neurology Gigi Ebenezer, M.B.B.S., M.D., and their colleagues recruited 10 patients with diabetic neuropathy and 10 healthy people of similar ages and took tiny (3 millimeters) "punch" biopsies from the skin of each participant's thigh. Several months later, they took 4 mm biopsies from the same site to see how the nerves, blood vessels and nerve-supporting cells, called Schwann cells, were growing back into the healing biopsy site.

In both the neuropathy patients and the healthy individuals, results reported in the June issue of Brain showed that the first to grow into the healing skin were blood vessels, followed soon after by Schwann cells and then axons, which appeared to use the blood vessels as scaffolds. However, the entire process was significantly delayed for the neuropathy patients. Not only was axon regeneration slo
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Contact: Christen Brownlee
cbrownlee@jhmi.edu
410-955-7832
Johns Hopkins Medical Institutions
Source:Eurekalert

Page: 1 2

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