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Japanese Journal of Ophthalmology

, Volume 58, Issue 2, pp 166–171 | Cite as

Autoantibodies to transient receptor potential cation channel, subfamily M, member 1 in a Japanese patient with melanoma-associated retinopathy

  • Yukiko Morita
  • Kazuhiro KimuraEmail author
  • Youichiro Fujitsu
  • Atsushi Enomoto
  • Shinji Ueno
  • Mineo Kondo
  • Koh-Hei Sonoda
Clinical Investigation

Abstract

Purpose

To report a case of melanoma-associated retinopathy (MAR) in a Japanese patient found to have autoantibodies to transient receptor potential cation channel, subfamily M, member 1 (TRPM1).

Case

An 82-year-old man presented with blurred vision OS as well as night blindness and photopsia OU. Fundus photography, fluorescein angiography, and spectral domain-optical coherence tomography findings were essentially normal. Goldmann perimetry revealed a relative central scotoma, including the blind spot in the right eye, as well as a relative scotoma around a blind spot OS. The full-field scotopic electroretinograms showed a “negative-type” pattern OU, suggestive of extensive bipolar cell dysfunction. Systemic examination revealed that the patient had malignant melanoma of the anus with lung metastasis. Autoantibodies to TRPM1 were detected in the serum of the patient by immunoblot analysis. Vitreous opacity developed during follow-up. The visual symptoms and vitreous opacity of the patient were markedly improved after oral prednisolone therapy. The patient died as a result of widespread metastasis of the melanoma at 11 months after his first visit.

Conclusion

The present case is the first reported instance of MAR positive for autoantibodies to TRPM1 in an Asian patient.

Keywords

Melanoma-associated retinopathy Electroretinogram (ERG) Transient receptor potential cation channel, subfamily M, member 1 (TRPM1) Paraneoplastic retinopathy 

Notes

Acknowledgments

We thank Mr. Takahisa Furukawa (Institute for Protein Research, Osaka University) for providing the expression vector for TRPM1 as well as Dr. Duco I. Hamasaki for editing the manuscript.

Conflicts of interest

Y. Morita, None; K. Kimura, None; Y. Fujitsu, None; A. Enomoto, None; S. Ueno, None; M. Kondo, None; K. Sonoda, None.

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Copyright information

© Japanese Ophthalmological Society 2014

Authors and Affiliations

  • Yukiko Morita
    • 1
  • Kazuhiro Kimura
    • 1
    Email author
  • Youichiro Fujitsu
    • 1
  • Atsushi Enomoto
    • 2
  • Shinji Ueno
    • 3
  • Mineo Kondo
    • 4
  • Koh-Hei Sonoda
    • 1
  1. 1.Department of OphthalmologyYamaguchi University Graduate School of MedicineUbeJapan
  2. 2.Department of PathologyNagoya University Graduate School of MedicineNagoyaJapan
  3. 3.Department of OphthalmologyNagoya University Graduate School of MedicineNagoyaJapan
  4. 4.Department of OphthalmologyMie University Graduate School of MedicineTsuJapan

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