Volume 84, Issue 2 pp. 208-224
Research Article

A Novel Autoantibody against Plexin D1 in Patients with Neuropathic Pain

Takayuki Fujii MD

Takayuki Fujii MD

Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka

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Ryo Yamasaki MD, PhD

Ryo Yamasaki MD, PhD

Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka

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Kyoko Iinuma MS

Kyoko Iinuma MS

Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka

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Daisuke Tsuchimoto PhD

Daisuke Tsuchimoto PhD

Department of Immunobiology and Neuroscience, Medical Institute of Bioregulation, Kyushu University, Fukuoka

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Yoshinori Hayashi PhD

Yoshinori Hayashi PhD

Department of Aging Science and Pharmacology, Graduate School of Dental Science, Kyushu University, Fukuoka

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Ban-yu Saitoh MD

Ban-yu Saitoh MD

Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka

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Takuya Matsushita MD, PhD

Takuya Matsushita MD, PhD

Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka

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Mizuho A. Kido DDS, PhD

Mizuho A. Kido DDS, PhD

Department of Anatomy and Physiology, Faculty of Medicine, Saga University, Saga

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Shinichi Aishima MD, PhD

Shinichi Aishima MD, PhD

Department of Pathology and Microbiology, Faculty of Medicine, Saga University, Saga

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Hiroshi Nakanishi PhD

Hiroshi Nakanishi PhD

Department of Pharmacology, Faculty of Pharmaceutical Sciences, Yasuda Women's University, Hiroshima, Japan

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Yusaku Nakabeppu DVM, PhD

Yusaku Nakabeppu DVM, PhD

Department of Immunobiology and Neuroscience, Medical Institute of Bioregulation, Kyushu University, Fukuoka

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Jun-ichi Kira MD, PhD

Corresponding Author

Jun-ichi Kira MD, PhD

Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, Fukuoka

Address correspondence to Dr Kira, Department of Neurology, Neurological Institute, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan. E-mail: [email protected]Search for more papers by this author
First published: 16 July 2018
Citations: 31

Abstract

Objective

To identify novel autoantibodies for neuropathic pain (NeP).

Methods

We screened autoantibodies that selectively bind to mouse unmyelinated C-fiber type dorsal root ganglion (DRG) neurons using tissue-based indirect immunofluorescence assays (IFA) with sera from 110 NeP patients with various inflammatory and allergic neurologic diseases or other neuropathies, and 50 controls without NeP including 20 healthy subjects and 30 patients with neurodegenerative diseases or systemic inflammatory diseases. IgG purified from IFA-positive patients' sera was subjected to Western blotting (WB) and immunoprecipitation (IP) using mouse DRG lysates. Immunoprecipitates were analyzed by liquid chromatography tandem mass spectrometry (LC-MS/MS) to identify target autoantigens.

Results

Antiunmyelinated C-fiber type DRG neuron antibodies were more frequent in patients with NeP than non-NeP subjects (10% vs 0%; p < 0.05). These autoantibodies were all from the IgG2 subclass and colocalized mostly with isolectin B4- and P2X3-positive pain-conducting small neurons but not with S100β-positive myelinated neurons. WB revealed a common immunoreactive band (approximately 220kDa). IP and LC-MS/MS studies identified plexin D1 as a target autoantigen. Immunoadsorption tests with recombinant human plexin D1 in IFA revealed that all 11 anti–small DRG neuron antibody-positive patients had anti–plexin D1 antibodies. Application of anti–plexin D1 antibody-positive patient sera to cultured DRG neurons increased membrane permeability, leading to cellular swelling. NeP patients with anti–plexin D1 antibodies commonly developed burning pain and current perception threshold abnormalities for C-fibers. Main comorbidities were atopy and collagen-vascular disease. Immunotherapies ameliorated NeP in 7 treated cases.

Interpretation

Anti–plexin D1 antibodies are a novel biomarker for immunotherapy-responsive NeP. Ann Neurol 2018;84:208–224

Potential Conflicts of Interest

Nothing to report.

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