Calcitonin gene-related peptide in the eye: release by sensory nerve stimulation and effects associated with neurogenic inflammation

Claes Wahlestedt, Britt Beding, Rolf Ekman, Olli Oksala, Johan Stjernschantz, Rolf Håkanson

Research output: Contribution to journalArticlepeer-review

115 Scopus citations

Abstract

Calcitonin gene-related peptide (CGRP) in the anterior uvea coexists with tachykinins (substance P and neurokinin A) in sensory nerve fibers deriving from the trigeminal ganglion. Mechanical or electrical stimulation of the intracranial part of the trigeminal nerve/ganglion in rabbits produced a marked hyperemia in the anterior segment of the eye, increased intraocular pressure, breakdown of the blood-aqueous barrier and miosis. Simultaneously, CGRP-like immunoreactivity was released into the aqueous humor. This suggests that the highly vasoactive CGRP can be released from sensory nerve fibers to participate in vascular responses. Unlike the tachykinins, CGRP per se was without effect on the pupillary diameter while disrupting the blood-aqueous barrier (resulting in aqueous flare) upon intravitreal injection. In addition, CGRP enhanced the aqueous flare evoked by a minimal eye trauma (infrared irradiation of the iris). The miosis evoked by the intravitreal injection of substance P was more pronounced when CGRP was injected simultaneously, and finally, substance P induced aqueous flare much more effectively when given together with a threshold dose of CGRP.

Original languageEnglish (US)
Pages (from-to)107-115
Number of pages9
JournalRegulatory Peptides
Volume16
Issue number2
DOIs
StatePublished - Dec 22 1986
Externally publishedYes

Keywords

  • calcitonin gene-related peptide
  • eye
  • neurogenic inflammation
  • rabbits
  • release
  • sensory nerve stimulation

ASJC Scopus subject areas

  • Biochemistry
  • Endocrinology
  • Physiology
  • Neuroscience(all)

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