Trans-eyelid distribution of epinastine to the conjunctiva following eyelid application in rabbits.
Jpn J Ophthalmol
; 68(5): 594-602, 2024 Sep.
Article
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| MEDLINE
| ID: mdl-38795193
ABSTRACT
PURPOSE:
To reveal the penetration of epinastine, an anti-allergic ophthalmic agent, into the eyelid and its distribution to the conjunctiva after administration of a cream formulation on rabbit eyelid skin. STUDYDESIGN:
Experimental study.METHODS:
Rabbits were treated with 0.5% epinastine cream on hair-shaved eyelids, followed by preparation of eyelid tissue slices to determine spatial tissue distribution of epinastine by liquid chromatography-tandem mass spectrometry (LC-MS/MS) quantification using laser-microdissected tissues and desorption electrospray ionization mass spectrometry imaging (DESI-MSI). In addition, following either eyelid application of 0.5% epinastine cream or ocular instillation of 0.1% epinastine eye drops, concentration-time profiles of epinastine in the palpebral conjunctiva and bulbar conjunctiva were determined using LC-MS/MS.RESULTS:
Laser microdissection coupled with LC-MS/MS analysis detected high concentrations of epinastine around the outermost layer of the eyelid at 0.5 h post-administration that gradually diffused deeper into the eyelid and was distributed in the conjunctival layer at 8 and 24 h post-administration. Similar time-dependent drug distribution was observed in high-spatial-resolution images obtained using DESI-MSI. Epinastine concentrations in the conjunctival tissues peaked at 4-8 h after administration of 0.5% epinastine cream and then decreased slowly over 72 h post-administration. In contrast, epinastine concentrations peaked quickly and decreased sharply after epinastine eye drop administration.CONCLUSION:
After the application of epinastine cream to the eyelid skin, epinastine gradually permeated the eyelid. The compound was retained in the conjunctiva for 8-24 h post-administration, indicating that epinastine cream is a promising long-acting formulation for treating allergic conjunctivitis.Palabras clave
Texto completo:
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Base de datos:
MEDLINE
Asunto principal:
Conjuntiva
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Espectrometría de Masas en Tándem
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Párpados
Idioma:
En
Revista:
Japanese journal of ophthalmology
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Jpn J Ophthalmol
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Jpn. j. ophthalmol
Año:
2024
Tipo del documento:
Article