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Kazuhiro Kimura, Tomoko Orita, Yukiko Kondo, Hongyan Zhou, Teruo Nishida; Upregulation of Matrix Metalloproteinase Expression by Poly(I:C) in Corneal Fibroblasts: Role of NF-κB and Interleukin-1β. Invest. Ophthalmol. Vis. Sci. 2010;51(10):5012-5018. doi: 10.1167/iovs.10-5167.
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© ARVO (1962-2015); The Authors (2016-present)
To characterize the mechanism of corneal ulceration associated with viral keratitis, the authors investigated the effects of polyinosinic-polycytidylic acid [poly(I:C)], a synthetic analog of viral double-stranded RNA, on the expression of matrix metalloproteinases (MMPs) in human corneal fibroblasts.
The expression of MMPs in human corneal fibroblasts cultured in the absence or presence of poly(I:C) was examined by immunoblot analysis, gelatin zymography, and quantitative reverse transcription–polymerase chain reaction analysis. The phosphorylation of the NF-κB inhibitor protein IκB-α was assessed by immunoblot analysis, and the concentration of interleukin (IL)-1β in culture supernatants was measured by enzyme-linked immunosorbent assay.
Poly(I:C) increased the expression of MMP-1 and MMP-3 in corneal fibroblasts at the mRNA and protein levels. It also induced the phosphorylation of IκB-α and the secretion of IL-1β in these cells. The poly(I:C)-induced expression of MMP-1 and MMP-3 was attenuated by a synthetic inhibitor of NF-κB signaling and by IL-1 receptor antagonist; the latter also inhibited poly(I:C)-induced phosphorylation of IκB-α.
Poly(I:C) induces the expression of MMP-1 and MMP-3 in human corneal fibroblasts in a manner dependent on activation of the transcription factor NF-κB and on IL-1β secretion. These effects may play an important role in corneal ulceration associated with viral keratitis.
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