A Potential Role of Crystallin in the Vitreous Bodies of Rats after Ischemia-reperfusion Injury

• 발행기관: 대한안과학회
• 저자명: Seong Min Hong Yun Sik Yang
• 간행물 정보: 『The Korean Journal of Ophthalmology』Vol.26 No.4, 248~254쪽, 전체 7쪽
• 주제분류: 의약학 > 의학일반
• 파일형태: PDF
• 발행일자: 2012.08.30

영문 초록

Purpose: Ischemia-reperfusion injury (I/R injury) is known not only to induce hypoxic and oxidative stress, but also to cause retinal degeneration in rats. Crystallins, known to inhibit the formation of reactive oxygen species, reduce apoptotic cell death. Our goal was to clarify not only the role of I/R injury-mediated crystallins, but also to evaluate the correlation of these compounds to anti-inflammation in the vitreous body. Methods: Twenty-four Sprague-Dawley rats were used in this study. We induced I/R injury by clamping the optic nerve for 30 minutes and then releasing it. The vitreous bodies were obtained from the experimental and control subjects 24, 48, and 72 hours after I/R injury. Two-dimensional electrophoresis was performed, and the targeted spots were further investigated using matrix-assisted laser desorption-ionization time-of-flight mass spectrometry, spectrophotometry, Western blotting, and histological examination. Results: After I/R injury, 23 spots were identified as crystallins. The ßB2 crystallins were transcriptionally and post-translationally regulated, whereas the αB crystallins were controlled by post-translational modifications in the vitreous bodies of the rats. The total amounts of αA and ß crystallins (including isotypes of ß crystalline) had increased 48 hours after injury. The phosphorylation of αB crystallin (at serine residues 19, 45, and 59) was significantly increased 48 hours later, whereas phosphorylation of ERK1/2 showed the greatest decrease. Conclusions: During hypoxic and oxidation stress, our results suggest that phosphorylated αB crystalline inhibits RAS, resulting in the inactivation of ERK1/2. The phosphorylation of αB crystallin may be associated with the inflammatory suppression in the vitreous body via the I/R injury model system.

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Conflict of Interest

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키워드

Crystallin Ischemia-reperfusion injury Vitreous body