Gastric mucosal nerve density
A biomarker for diabetic autonomic neuropathy?
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Abstract
Background: Autonomic neuropathy is a frequent diagnosis for the gastrointestinal symptoms or postural hypotension experienced by patients with longstanding diabetes. However, neuropathologic evidence to substantiate the diagnosis is limited. We hypothesized that quantification of nerves in gastric mucosa would confirm the presence of autonomic neuropathy.
Methods: Mucosal biopsies from the stomach antrum and fundus were obtained during endoscopy from 15 healthy controls and 13 type 1 diabetic candidates for pancreas transplantation who had secondary diabetic complications affecting the eyes, kidneys, and nerves, including a diagnosis of gastroparesis. Neurologic status was evaluated by neurologic examination, nerve conduction studies, and skin biopsy. Biopsies were processed to quantify gastric mucosal nerves and epidermal nerves.
Results: Gastric mucosal nerves from diabetic subjects had reduced density and abnormal morphology compared to control subjects (p < 0.05). The horizontal and vertical meshwork pattern of nerve fibers that normally extends from the base of gastric glands to the basal lamina underlying the epithelial surface was deficient in diabetic subjects. Eleven of the 13 diabetic patients had residual food in the stomach after overnight fasting. Neurologic abnormalities on clinical examination were found in 12 of 13 diabetic subjects and nerve conduction studies were abnormal in all patients. The epidermal nerve fiber density was deficient in skin biopsies from diabetic subjects.
Conclusions: In this observational study, gastric mucosal nerves were abnormal in patients with type 1 diabetes with secondary complications and clinical evidence of gastroparesis. Gastric mucosal biopsy is a safe, practical method for histologic diagnosis of gastric autonomic neuropathy.
Footnotes
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Supplemental data at www.neurology.org
Study funding: Supported by the Juvenile Diabetes Research Foundation (JDRF) 1-2008-179.
Disclosure: Author disclosures are provided at the end of the article.
Disclaimer: This publication was made possible by support from the National Center for Research Resources' (NCRR) grant M01 RR00400, a component of the National Institutes of Health. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of NIH or NCRR.
Presented at the Peripheral Neuropathy Society meeting, July 2007, Snowbird, UT.
Received February 2, 2010. Accepted in final form April 28, 2010.
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