IN VITRO STUDIES ON THE PHOTOSENSITIZED OXIDATION OF LENS PROTEINS BY PORPHYRINS
IN VITRO STUDIES ON THE PHOTOSENSITIZED OXIDATION OF LENS PROTEINS BY PORPHYRINS
复制标题
卟啉光敏氧化晶状体蛋白的体外研究
DOI:
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发表时间:
1987
影响因子:
3.3
通讯作者:
J. Dillon
中科院分区:
文献类型:
--
作者:
J. Roberts;J. Dillon
Abstract Porphyrins, which may be introduced into the eye as a result of abnormal porphyrin metabolism (uroporphyrin–Uro) or when used in the diagnosis or photodynamic therapy of certain tumors, including intraocular tumors (hematoporphyrin–Hp and‘hematoporphyrin derivative’–Hpd and mesotetra(P‐sulfonatophenyl)porphyrin–TPPS) are efficient photosensitizers in biological systems. We have been studying the potential phototoxic side effects of these drugs in the lens of the eye. Encapsulated in the human lens is a mixture of soluble protein crystallins. With little turnover of protein in the lens, any photosensitized modifications will accumulate and may result in an opacification of the lens. To evaluate the potential of different porphyrins to induce such damage, a series of porphyrins were photolyzed (transmission above 295 nm) in the presence of calf lens protein (2 mg m−1). Marked photopolymerization and histidine destruction were observed for the lens protein photolyzed in the presence of all of the drugs. We have found that the relative effectiveness of the following porphyrins to induce that damage is: Uro = TPPS Hpd = Hp. Both the singlet oxygen quencher, azide, and the free radical scavenger, penicillamine, decrease this photosensitized oxidative damage to lens protein. TPPS binds significantly to lens protein and this binding leads to conformational changes in that protein.
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影响因子:
11.2
作者:
Kessel,D;Cheng,ML
通讯作者:
Cheng,ML
影响因子:
4.4
作者:
Roberts,JE
通讯作者:
Roberts,JE
影响因子:
11.2
作者:
Gomer,CJ;Jester,JV;Razum,NJ;Szirth,BC;Murphree,AL
通讯作者:
Murphree,AL
影响因子:
11.2
作者:
Gomer,CJ;Doiron,DR;Jester,JV;Szirth,BC;Murphree,AL
通讯作者:
Murphree,AL
影响因子:
2
作者:
Sethna,SS;Holleschau,AM;Rathbun,WB
通讯作者:
Rathbun,WB