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Fakih D, Guerrero-Moreno A, Baudouin C, et al. Capsazepine decreases corneal pain syndrome in severe dry eye disease. J Neuroinflammation. 2021;18(1):111doi: 10.1186/s12974-021-02162-7.
Fakih, D., Guerrero-Moreno, A., Baudouin, C., Réaux-Le Goazigo, A., & Parsadaniantz, S. M. (2021). Capsazepine decreases corneal pain syndrome in severe dry eye disease. Journal of neuroinflammation, 18(1), 111. https://doi.org/10.1186/s12974-021-02162-7
Fakih, Darine, et al. "Capsazepine decreases corneal pain syndrome in severe dry eye disease." Journal of neuroinflammation vol. 18,1 (2021): 111. doi: https://doi.org/10.1186/s12974-021-02162-7
Fakih D, Guerrero-Moreno A, Baudouin C, Réaux-Le Goazigo A, Parsadaniantz SM. Capsazepine decreases corneal pain syndrome in severe dry eye disease. J Neuroinflammation. 2021 May 11;18(1):111. doi: 10.1186/s12974-021-02162-7. PMID: 33975636; PMCID: PMC8114509.
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J Neuroinflammation. 2021 May 11;18(1):111. doi: 10.1186/s12974-021-02162-7.

Capsazepine decreases corneal pain syndrome in severe dry eye disease.

Journal of neuroinflammation

Darine Fakih, Adrian Guerrero-Moreno, Christophe Baudouin, Annabelle Réaux-Le Goazigo, Stéphane Mélik Parsadaniantz

Affiliations

  1. Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012, Paris, France.
  2. R&D Department, Laboratoires Théa, 12 rue Louis Biérot, F-63000, Clermont-Ferrand, France.
  3. CHNO des Quinze-Vingts, INSERM-DGOS CIC 1423, 17 rue Moreau, F-75012, Paris, France.
  4. Department of Ophthalmology, Ambroise Paré Hospital, AP-HP, University of Versailles Saint-Quentin-en-Yvelines, 9 avenue Charles de Gaulle, F-92100, Boulogne-Billancourt, France.
  5. Sorbonne Université, INSERM, CNRS, Institut de la Vision, 17 rue Moreau, F-75012, Paris, France. [email protected].

PMID: 33975636 PMCID: PMC8114509 DOI: 10.1186/s12974-021-02162-7

Abstract

BACKGROUND: Dry eye disease (DED) is a multifactorial disease of the ocular surface accompanied by neurosensory abnormalities. Here, we evaluated the effectiveness of transient receptor potential vanilloid-1 (TRPV1) blockade to alleviate ocular pain, neuroinflammation, and anxiety-like behavior associated with severe DED.

METHODS: Chronic DED was induced by unilateral excision of the Harderian and extraorbital lacrimal glands of adult male mice. Investigations were conducted at 21 days after surgery. The mRNA levels of TRPV1, transient receptor potential ankyrin-1 (TRPA1), and acid-sensing ion channels 1 and 3 (ASIC1 and ASIC3) in the trigeminal ganglion (TG) were evaluated by RNAscope in situ hybridization. Multi-unit extracellular recording of ciliary nerve fiber activity was used to monitor spontaneous and stimulated (cold, heat, and acid) corneal nerve responsiveness in ex vivo eye preparations. DED mice received topical instillations of the TRPV1 antagonist (capsazepine) twice a day for 2 weeks from d7 to d21 after surgery. The expression of genes involved in neuropathic and inflammatory pain was evaluated in the TG using a global genomic approach. Chemical and mechanical corneal nociception and spontaneous ocular pain were monitored. Finally, anxiety-like behaviors were assessed by elevated plus maze and black and white box tests.

RESULTS: First, in situ hybridization showed DED to trigger upregulation of TRPV1, TRPA1, ASIC1, and ASIC3 mRNA in the ophthalmic branch of the TG. DED also induced overexpression of genes involved in neuropathic and inflammatory pain in the TG. Repeated instillations of capsazepine reduced corneal polymodal responsiveness to heat, cold, and acidic stimulation in ex vivo eye preparations. Consistent with these findings, chronic capsazepine instillation inhibited the upregulation of genes involved in neuropathic and inflammatory pain in the TG of DED animals and reduced the sensation of ocular pain, as well as anxiety-like behaviors associated with severe DED.

CONCLUSION: These data provide novel insights on the effectiveness of TRPV1 antagonist instillation in alleviating abnormal corneal neurosensory symptoms induced by severe DED, opening an avenue for the repositioning of this molecule as a potential analgesic treatment for patients suffering from chronic DED.

Keywords: Behavior; Dry eye; Electrophysiology; Nociceptors; TRPV1 antagonist; Trigeminal pain

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