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From the Membrane Biochemistry Laboratory, Peripheral Nerve Center, Neurology and Biochemistry, Mayo Clinic and Mayo Foundation, Rochester, MN.
Albumin was measured in the endoneurium of fascicular biopsies of sural nerves and in plasma from diabetic patients with polyneuropathy by solid phase radioimmunoassay, and normalized to total endoneurial and plasma protein, respectively, to obtain an index of the blood-nerve barrier (BNB-Index). Fifteen diabetic patients with polyneuropathy had a mean BNB-Index of 29.7 ± 12.6% SD, 3.8 times higherthan control values (7.8 ± 2.0% SD, n = 4).These data suggest that the blood-nerve barrier of endoneurial capillaries is impaired in patients with diabetic polyneuropathy.
Address correspondence and reprint requests to Dr. Poduslo, Membrane Biochemistry Laboratory, Neurology and Biochemistry, Mayo Clinic and Mayo Foundation, Rochester, MN 55905.
Supported in part by a Peripheral Neuropathy Clinical Center Grant from NINCDS (NS14304) and the Borchard Fund.
Accepted for publication April 10, 1985
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