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KMID : 0364920080330040143
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Journal of Radiation Protection and Research
2008 Volume.33 No. 4 p.143 ~ p.150
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SHRINKAGE OF VITREOUS BODY CAUSED BY HYDROXYL RADICAL
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Park Myoung-Joo
Shimada Takashi
Matuo Yoichirou
Izumi Yoshinobu
Akiyama Yoko
Nishijima Shigehiro
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Abstract
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In this study, we examined the effect of hydroxyl radical generated by -ray and UV irradiation on shrinkage of vitreous body. Change in gel ratio of vitreous body and change in the properties of its components (collagen, sodium hyaluronate) were analyzed. By comparing these results, the amount of hydroxyl radical, which induces the considerable shrinkage of vitreous body, was evaluated from theoretical calculation based on experimental condition and some reported kinetic parameters. It was concluded that the integrated amount of hydroxyl radical required to liquefy half of the vitreous body (Vitreous body gel ratio = 50%) was estimated as from -ray irradiation experiment. Also, from UV irradiation experiment result, it was confirmed that the effect of hydroxyl radical is larger than that of other reactive species. The causes of shrinkage of vitreous body are supposed as follows, 1) decrease in viscosity by cleavage of glycoside bond in sodium hyaluronate, 2) leaching of collagen from vitreous body and 3) leaching of crosslinked products and scission products of collagen.
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KEYWORD
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Vitreous body, Hydroxyl radical, -ray, UV irradiation, Collagen, Sodium hyaluronate
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