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Invest Ophthalmol Vis Sci. 2015 Jan 22;56(2):983-92. doi: 10.1167/iovs.14-15859.

Corneal epithelial wound healing and bactericidal effect of conditioned medium from human uterine cervical stem cells.

Author information

1
Department of Surgery, Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, Santiago de Compostela, Spain.
2
Department of Physiology, Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, Santiago de Compostela, Spain.
3
Unidad de Investigación, Fundación Hospital de Jove, Gijón, Spain Fundación para la Investigación con Células Madre Uterinas (FICEMU), Gijón, Spain.
4
Servicio de Microbiología, Complejo Hospitalario Universitario de Santiago de Compostela, Santiago de Compostela, Spain.
5
Department of Surgery, Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, Santiago de Compostela, Spain Service of Ophthalmology, Complejo Hospitalario Universitario de Santiago de Compostela, Santiago de Compostela, Spain.
6
Department of Applied Physics (Optometry Area), Optic and Optometry Faculty, University of Santiago de Compostela, Santiago de Compostela, Spain.
7
Department of Obstetrics and Gynecology, University of Santiago de Compostela, Santiago de Compostela, Spain.
8
Unidad de Investigación, Fundación Hospital de Jove, Gijón, Spain.
9
Unidad de Investigación, Fundación Hospital de Jove, Gijón, Spain Service of Ophthalmology, Fundación Hospital de Jove, Gijón, Spain.

Abstract

PURPOSE:

To evaluate the effect of conditioned medium from human uterine cervical stem cells (CM-hUCESCs) on corneal epithelial healing in a rat model of dry eye after alkaline corneal epithelial ulcer. We also tested the bactericidal effect of CM-hUCESCs.

METHODS:

Dry eye was induced in rats by extraocular lacrimal gland excision, and corneal ulcers were produced using NaOH. Corneal histologic evaluation was made with hematoxylin-eosin (H&E) staining. Real-time PCR was used to evaluate mRNA expression levels of proinflammatory cytokines. We also studied the bactericidal effect of CM-hUCESCs in vitro and on infected corneal contact lenses (CLs) using Escherichia coli and Staphylococcus epidermidis bacteria. In addition, in order to investigate proteins from CM-hUCESCs that could mediate these effects, we carried out a human cytokine antibody array.

RESULTS:

After injury, dry eyes treated with CM-hUCESCs significantly improved epithelial regeneration and showed reduced corneal macrophage inflammatory protein-1 alpha (MIP-1α) and TNF-α mRNA expression as compared to untreated eyes and eyes treated with culture medium or sodium hyaluronate ophthalmic drops. In addition, we found in CM-hUCESCs high levels of proteins, such as tissue inhibitors of metalloproteinases 1 and 2, fibroblast growth factor 6 and 7, urokinase receptor, and hepatocyte growth factor, that could mediate these effects. In vitro, CM-hUCESCs showed a clear bactericidal effect on both E. coli and S. epidermidis and CLs infected with S. epidermidis. Analyses of CM-hUCESCs showed elevated levels of proteins that could be involved in the bactericidal effect, such as the chemokine (C-X-C motif) ligands 1, 6, 8, 10, and the chemokine (C-C motif) ligands 5 and 20.

CONCLUSIONS:

Treatment with CM-hUCESCs improved wound healing of alkali-injured corneas and showed a strong bactericidal effect on CLs. Patients using CLs and suffering from dry eye, allergies induced by commercial solutions, or small corneal injuries could benefit from this treatment.

KEYWORDS:

E. coli; S. epiderimidis; corneal ulcers; dry eye; secretoma

PMID:
25613942
DOI:
10.1167/iovs.14-15859
[Indexed for MEDLINE]

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