Secretory Leukocyte Protease Inhibitor Is an Inducible Antimicrobial Peptide Expressed in <i>Staphylococcus aureus</i> Endophthalmitis

Reviglio, Victor E.; Sambuelli, Ruben H.; Olmedo, Alejandra; Falco, Micaela; Echenique, Jose; O'Brien, Terrence P.; Kuo, Irene C.

doi:https://doi.org/10.1155/2007/93857

Mediators of Inflammation

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Research Article | Open Access

Volume 2007 | Article ID 093857 | https://doi.org/10.1155/2007/93857

Secretory Leukocyte Protease Inhibitor Is an Inducible Antimicrobial Peptide Expressed in Staphylococcus aureus Endophthalmitis

Victor E. Reviglio,¹Ruben H. Sambuelli,¹Alejandra Olmedo,¹Micaela Falco,¹Jose Echenique,²Terrence P. O'Brien,³and Irene C. Kuo⁴

Received19 Jun 2007

Accepted30 Oct 2007

Published03 Dec 2007

Abstract

Purpose. To describe the presence of secretory leukocyte protease inhibitor (SLPI), a cationic peptide with antimicrobial and antiprotease activity, in the innate ocular immune reaction in a rat model of Staphylococcus aureus endophthalmitis. Methods. Seventy-five female Lewis rats were divided into three groups: the endophthalmitis group received an intravitreal injection of 65 colony-forming units of viable S. aureus, the vehicle-injected group received balanced sterile saline solution (BSS), and the control group was not injected. Eyes were enucleated at 24 and 48 hours and processed for immunohistochemical staining and Western blot studies for SLPI. Results. In S. aureus endophthalmitis eyes, there was strong immunostaining for SLPI in the retina and vitreous with associated neutrophilic infiltrates. At 48 hours, corneas also stained for SLPI. Western blots confirmed increased SLPI expression in all infected eyes. By immunohistochemical assays, SLPI was absent in the BSS and control eyes. The causative pathogen was identified in all samples from the endophthalmitis group by traditional culture methods. Conclusions. To our knowledge, this report is the first to demonstrate the presence of SLPI in the inflamed cornea, vitreous, and retina tissues of rat eyes with S. aureus endophthalmitis, suggesting that SLPI has an active role in the innate immunity of the eye. Release of SLPI by inflammatory cells in the anterior and posterior segments may contribute to the host defense response against infectious endophthalmitis.

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Copyright © 2007 Victor E. Reviglio et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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