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Progesterone Application to the Rat Forehead Produces Corneal Antinociception
PURPOSE: Ocular pain and discomfort are the most defining symptoms of dry eye disease. We determined the ability of topical progesterone to affect corneal sensitivity and brainstem processing of nociceptive inputs. METHODS: Progesterone or vehicle gel was applied to the shaved forehead in male Sprag...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Association for Research in Vision and Ophthalmology
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6736375/ https://www.ncbi.nlm.nih.gov/pubmed/31013343 http://dx.doi.org/10.1167/iovs.18-26049 |
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author | Meng, Ian D. Barton, Stephen T. Goodney, Ian Russell, Rachel Mecum, Neal E. |
author_facet | Meng, Ian D. Barton, Stephen T. Goodney, Ian Russell, Rachel Mecum, Neal E. |
author_sort | Meng, Ian D. |
collection | PubMed |
description | PURPOSE: Ocular pain and discomfort are the most defining symptoms of dry eye disease. We determined the ability of topical progesterone to affect corneal sensitivity and brainstem processing of nociceptive inputs. METHODS: Progesterone or vehicle gel was applied to the shaved forehead in male Sprague Dawley rats. As a site control, gel also was applied to the cheek on the side contralateral to corneal stimulation. Corneal mechanical thresholds were determined using the Cochet-Bonnet esthesiometer in intact and lacrimal gland excision–induced dry eye animals. Eye wipe behaviors in response to hypertonic saline and capsaicin were examined, and corneal mustard oil-induced c-Fos immunohistochemistry was quantified in the brainstem spinal trigeminal nucleus. RESULTS: Progesterone gel application to the forehead, but not the contralateral cheek, increased corneal mechanical thresholds in intact and lacrimal gland excision animals beginning <30 minutes after treatment. Subcutaneous injection of the local anesthetic bupivacaine into the forehead region before application of progesterone prevented the increase in corneal mechanical thresholds. Furthermore, progesterone decreased capsaicin-evoked eye wipe behavior in intact animals and hypertonic saline evoked eye wipe behavior in dry eye animals. The number of Fos-positive neurons located in the caudal region of the spinal trigeminal nucleus after corneal mustard oil application was reduced in progesterone-treated animals. CONCLUSIONS: Results from this study indicate that progesterone, when applied to the forehead, produces analgesia as indicated by increased corneal mechanical thresholds and decreased nociceptive responses to hypertonic saline and capsaicin. |
format | Online Article Text |
id | pubmed-6736375 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | The Association for Research in Vision and Ophthalmology |
record_format | MEDLINE/PubMed |
spelling | pubmed-67363752019-09-20 Progesterone Application to the Rat Forehead Produces Corneal Antinociception Meng, Ian D. Barton, Stephen T. Goodney, Ian Russell, Rachel Mecum, Neal E. Invest Ophthalmol Vis Sci Cornea PURPOSE: Ocular pain and discomfort are the most defining symptoms of dry eye disease. We determined the ability of topical progesterone to affect corneal sensitivity and brainstem processing of nociceptive inputs. METHODS: Progesterone or vehicle gel was applied to the shaved forehead in male Sprague Dawley rats. As a site control, gel also was applied to the cheek on the side contralateral to corneal stimulation. Corneal mechanical thresholds were determined using the Cochet-Bonnet esthesiometer in intact and lacrimal gland excision–induced dry eye animals. Eye wipe behaviors in response to hypertonic saline and capsaicin were examined, and corneal mustard oil-induced c-Fos immunohistochemistry was quantified in the brainstem spinal trigeminal nucleus. RESULTS: Progesterone gel application to the forehead, but not the contralateral cheek, increased corneal mechanical thresholds in intact and lacrimal gland excision animals beginning <30 minutes after treatment. Subcutaneous injection of the local anesthetic bupivacaine into the forehead region before application of progesterone prevented the increase in corneal mechanical thresholds. Furthermore, progesterone decreased capsaicin-evoked eye wipe behavior in intact animals and hypertonic saline evoked eye wipe behavior in dry eye animals. The number of Fos-positive neurons located in the caudal region of the spinal trigeminal nucleus after corneal mustard oil application was reduced in progesterone-treated animals. CONCLUSIONS: Results from this study indicate that progesterone, when applied to the forehead, produces analgesia as indicated by increased corneal mechanical thresholds and decreased nociceptive responses to hypertonic saline and capsaicin. The Association for Research in Vision and Ophthalmology 2019-04 /pmc/articles/PMC6736375/ /pubmed/31013343 http://dx.doi.org/10.1167/iovs.18-26049 Text en Copyright 2019 The Authors http://creativecommons.org/licenses/by-nc-nd/4.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. |
spellingShingle | Cornea Meng, Ian D. Barton, Stephen T. Goodney, Ian Russell, Rachel Mecum, Neal E. Progesterone Application to the Rat Forehead Produces Corneal Antinociception |
title | Progesterone Application to the Rat Forehead Produces Corneal Antinociception |
title_full | Progesterone Application to the Rat Forehead Produces Corneal Antinociception |
title_fullStr | Progesterone Application to the Rat Forehead Produces Corneal Antinociception |
title_full_unstemmed | Progesterone Application to the Rat Forehead Produces Corneal Antinociception |
title_short | Progesterone Application to the Rat Forehead Produces Corneal Antinociception |
title_sort | progesterone application to the rat forehead produces corneal antinociception |
topic | Cornea |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6736375/ https://www.ncbi.nlm.nih.gov/pubmed/31013343 http://dx.doi.org/10.1167/iovs.18-26049 |
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