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Keratoconus: an inflammatory disorder?

Eye (Lond). 2015 May 1;

Authors: Galvis V, Sherwin T, Tello A, Merayo J, Barrera R, Acera A

Abstract
Keratoconus has been classically defined as a progressive, non-inflammatory condition, which produces a thinning and steepening of the cornea. Its pathophysiological mechanisms have been investigated for a long time. Both genetic and environmental factors have been associated with the disease. Recent studies have shown a significant role of proteolytic enzymes, cytokines, and free radicals; therefore, although keratoconus does not meet all the classic criteria for an inflammatory disease, the lack of inflammation has been questioned. The majority of studies in the tears of patients with keratoconus have found increased levels of interleukin-6 (IL-6), tumor necrosis factor-α(TNF-α), and matrix metalloproteinase (MMP)-9. Eye rubbing, a proven risk factor for keratoconus, has been also shown recently to increase the tear levels of MMP-13, IL-6, and TNF-α. In the tear fluid of patients with ocular rosacea, IL-1α and MMP-9 have been reported to be significantly elevated, and cases of inferior corneal thinning, resembling keratoconus, have been reported. We performed a literature review of published biochemical changes in keratoconus that would support that this could be, at least in part, an inflammatory condition.Eye advance online publication, 1 May 2015; doi:10.1038/eye.2015.63.

PMID: 25931166 [PubMed - as supplied by publisher]

http://www.ncbi.nlm.nih.gov/pubmed/25931166?dopt=Abstract = URL to article

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