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Melanopsin expression in the cornea.

Anton Delwig1, Shawnta Y Chaney1, Andrea S Bertke2

  • 1Department of Ophthalmology,School of Medicine,University of California San Francisco,San Francisco,California.

Visual Neuroscience
|June 16, 2018
PubMed
Summary
This summary is machine-generated.

Melanopsin, a light-sensitive pigment, is found in corneal nerve fibers and trigeminal ganglia neurons. Despite its presence, no light responses were detected, suggesting a non-visual sensory role for melanopsin in the cornea.

Keywords:
CorneaMelanopsinPhotosensitivityTrigeminal ganglion

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Photobiology

Background:

  • Intrinsically photosensitive retinal ganglion cells (ipRGCs) utilize melanopsin for non-visual light perception.
  • Melanopsin's presence extends beyond the retina to other tissues, including the iris and vasculature.
  • Recent findings indicate melanopsin expression in the cornea and associated trigeminal ganglia (TG).

Purpose of the Study:

  • To investigate the functional role of melanopsin in the cornea and trigeminal ganglia.
  • To determine if melanopsin in these non-retinal tissues mediates light responses.
  • To explore potential alternative sensory functions of corneal melanopsin.

Main Methods:

  • Histological analysis using genetically driven markers and antibody staining to confirm melanopsin localization.
  • Electrophysiological recordings and calcium imaging to assess light responsiveness in corneal fibers and TG neurons.
  • RT-PCR to detect melanopsin mRNA expression in TG neurons.

Main Results:

  • Melanopsin protein was localized in corneal nerve fibers and mRNA detected in a subset of TG neurons.
  • No light-evoked electrophysiological or calcium signaling responses were observed in melanopsin-expressing corneal fibers or TG neurons.
  • Histological evidence confirmed melanopsin presence, but functional light sensitivity was absent.

Conclusions:

  • Melanopsin in the cornea and TG does not appear to mediate light responses.
  • The function of melanopsin in the cornea may be non-visual, potentially serving other sensory roles like temperature sensing.
  • Further research is needed to elucidate the precise function of non-retinal melanopsin.