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Direct immunofluorescence in sural nerve biopsies.
A Schenone1, I De Martini, M Tabaton
1Clinica Neurologica, Università di Genova, Italy.
European Neurology
|January 1, 1988
Summary
Direct immunofluorescence (DIF) detected plasma proteins in 59% of peripheral nerve biopsies. While often unspecific, DIF can aid in diagnosing neuropathies and understanding disease mechanisms.
Area of Science:
- Neurology
- Immunopathology
- Histopathology
Background:
- Direct immunofluorescence (DIF) is a technique used to detect immune deposits in tissues.
- Peripheral neuropathies encompass a diverse group of disorders affecting the peripheral nervous system.
Purpose of the Study:
- To evaluate the utility of DIF in analyzing sural nerve biopsies from patients with various neuropathies.
- To determine the diagnostic and pathogenetic significance of plasma protein deposition in peripheral nerves.
Main Methods:
- Sural nerve biopsies from 66 patients were analyzed using DIF.
- Antibodies against immunoglobulins (IgG, IgA, IgM, kappa, lambda), complement components (C3, C4), albumin, and fibrinogen were employed.
Main Results:
- Plasma proteins were detected in 59% (37/63) of neuropathies.
- IgM deposition along myelin sheaths was observed in specific demyelinating neuropathies.
- IgM within the perineurium was found in diverse neuropathies including hereditary, diabetic, and paraneoplastic.
- Fibrinogen, albumin, IgG, and IgA were variably present in inflammatory, vasculitic, hereditary, and toxic neuropathies.
Conclusions:
- DIF is often an unspecific marker of sural nerve pathology.
- In select cases, DIF can be valuable for diagnosing neuropathies and elucidating pathogenetic mechanisms.