Uveitis is the inflammation of uveal tract comprising of iris, ciliary body and choroid. Blood ocular barriers maintaining the homeostasis of eye breach during uveitis, leads to high risk for sight-threatening complications. The purpose of this study was to compare the anti-inflammatory activity enabled by two diverse pharmacological agents (prednisolone and dapsone) using their effect on aqueous humor proteome. Wistar rats of either sex (150-200g) were used and randomly divided into various groups. Normal group was injected with 0.1ml normal saline (NS), endotoxin (LPS) (200 μg/0.1ml NS) was injected into endotoxin induced inflammatory groups followed by 0.1% dapsone and 1% prednisolone treatment in endotoxin induced uveitis (EIU) groups, respectively. Aqueocentesis was performed post 24 hour inflammation and samples were subjected for clinical parameter evaluation, cytokine analysis as well as global proteomic analysis using High-resolution mass spectrometer. Following which spectrum analysis, production spectra of peptides were matched against R. Norvegicus Protein Database (Uniport) using Proteome Discoverer (v2.2). Upon clinical evaluation, the anterior segment images post dapsone and prednisolone treatment have shown marked decrease in hyperaemia, miosis and iridial vessels vasodilation in rat eyes as compared to inflammation group. The result of cytokine analysis revealed 0.1% dapsone and prednisolone both significantly decreased the TNF-α levels. HRMS studies analysis expressed 140, 160, 158 and 141 proteins unique to normal, EIU, Dapsone and prednisolone group respectively. To conclude aqueous humor pharmacoproteomic revealed the anti-inflammatory activity of the dapsone comparable to the prednisolone treatment in endotoxin induced uveitis. The topical dapsone may be used as an alternative therapeutic option in treating uveitis without elevating intraocular pressure.
Keywords: Aqueous humor; Dapsone; Endotoxin; Orbitrap; Pharmacoproteomics; Uveitis.
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