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AN10079809-20100331-0001.pdf
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Title |
Title |
UVB-induced damage and photoreactivation in the integument of the terrestrial isopod Armadillidium vulgare
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佐藤, 由紀子
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Kana |
サトウ, ユキコ
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Romanization |
Sato, Yukiko
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阿部, 道夫
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アベ, ミチオ
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Abe, Michio
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佐々木, 史江
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ササキ, フミエ
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Sasaki, Fumie
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中村, 真樹
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ナカムラ, マサキ
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Nakamura, Masaki
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高柳, 信之輔
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タカヤナギ, シンノスケ
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Takayanagi, Shinnosuke
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根岸, 寿美子
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ネギシ, スミコ
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Negishi, Sumiko
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慶應義塾大学日吉紀要刊行委員会
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ケイオウ ギジュク ダイガク ヒヨシ キヨウ カンコウ イインカイ
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Romanization |
Keio gijuku daigaku Hiyoshi kiyo kanko iinkai
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2010
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慶應義塾大学日吉紀要. 自然科学
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The Hiyoshi review of the natural science
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47
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Year |
2010
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Start page |
1
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End page |
13
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Abstract |
Recent studies have shown the molecular mechanisms of UV-induced damage such as the production of cyclobutane pyrimidine dimers (CPDs), increased apoptosis and DNA repair by photolyase. However, ultrastructural changes induced by UVB and subsequent mechanisms remain unsolved "in vivo", due to the absence of suitable living animal models to investigate the photoreactivation following UV damage. In this study, we show that UVB- induced DNA damage and apoptosis arelimited in the integument of woodlice "Armadillidium vulgare in vivo" and that the DNA damage is repaired by a hotolyase excited by visible light. UVB (15.4 J/m2, 2.4 kJ/m2) radiation induces one type of DNA damage, CPD, in the integument of A. "vulgare", and the number of apoptotic cells increased 9 hr after UVB exposure. Treatment with visible light accelerated the reduction of CPD and suppressed the increase in apoptosis induced by UVB. This study also provides evidence showing that UVB is blocked by two kinds of pigment cells, black and yellow hromatophores, and that clusters of pigment granules, which are usually distributed within chromatophores, are excreted into the epidermal cell layer beneath the cuticle. These results suggest that the photoreactivation mechanism and the pigment cell layer are important to protection from UVB in living A. "vulgare"
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Keyword |
cyclobutane pyrimidine dimers
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Departmental Bulletin Paper
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