A transient receptor potential vanilloid 1-dependent corneal-trigeminal neuroinflammatory circuit promotes corneal neuropathy

Exp Mol Med. 2026 Mar;58(2):605-621. doi: 10.1038/s12276-026-01653-y. Epub 2026 Feb 25.

Abstract

Corneal neurosensory abnormalities cause pain and discomfort in ocular surface disease, yet their pathophysiology is poorly understood. Here we show that in a mouse dry eye model, the ocular (over)activation of transient receptor potential vanilloid 1 (TRPV1) channels in response to tear deficiency and tissue damage promotes neuroinflammatory gene expression and macrophage reactivity in the trigeminal ganglion, where the cornea-innervating sensory neurons are located. This is accompanied by ocular surface macrophage activation, impaired corneal sensitivity to mechanical and non-TRPV1-mediated chemical stimulation, reduced corneal nerve density and the sensitization of ocular TRPV1 channels, thus establishing a vicious neurosensory cycle. Isolated corneal TRPV1 activation without ocular desiccation recapitulates macrophage reactivity, corneal nerve degeneration and trigeminal neuroinflammation, whereas the ocular substance P blockade reverts most of the TRPV1-driven corneal neurosensory abnormalities. Our study identifies a corneal-trigeminal axis that facilitates corneal neurosensory dysfunction and suggests potential targets for the treatment of ocular surface disease-associated corneal neuropathy.

MeSH terms

  • Animals
  • Cornea* / innervation
  • Cornea* / metabolism
  • Cornea* / pathology
  • Corneal Diseases* / metabolism
  • Corneal Diseases* / pathology
  • Disease Models, Animal
  • Dry Eye Syndromes / metabolism
  • Dry Eye Syndromes / pathology
  • Macrophages / metabolism
  • Mice
  • Mice, Inbred C57BL
  • Neuroinflammatory Diseases* / metabolism
  • Neuroinflammatory Diseases* / pathology
  • TRPV Cation Channels* / genetics
  • TRPV Cation Channels* / metabolism
  • Trigeminal Ganglion* / metabolism
  • Trigeminal Ganglion* / pathology

Substances

  • TRPV Cation Channels
  • TRPV1 protein, mouse