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Impact of UVR-A on ...
Impact of UVR-A on whole human lenses, supernatants of buffered human lens homogenates, and purified argpyrimidine and 3-OH-kynurenine
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Kessel, Line (författare)
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- Kalinin, Stanislav (författare)
- Umeå universitet,Kemiska institutionen
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Soroka, Vladislav (författare)
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Larsen, Michael (författare)
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- Johansson, Lennart B-Å (författare)
- Umeå universitet,Kemiska institutionen
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(creator_code:org_t)
- 2005-03-02
- 2005
- Engelska.
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Ingår i: ACTA OPHTHALMOLOGICA SCANDINAVICA. - : Wiley. - 1395-3907. ; 83:2, s. 221-7
- Relaterad länk:
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https://onlinelibrar...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Purpose: Yellow chromophores and fluorescent compounds accumulate in the lens with age. Some of these compounds are photochemically active. The present study aimed to examine the photochemical effect of ultraviolet radiation-A (UVR-A) on the human lens.Methods: Intact human lenses and supernatants of buffered lens homogenates were exposed to UVR-A. The effect of UVR-A was evaluated by time-resolved and steady-state fluorescence spectroscopy, visual evaluation of colour and protein gel electrophoresis.Results: Intact lenses exposed to UVR-A showed no changes in time-resolved or steady-state fluorescence properties but the yellow coloration was visibly attenuated. The supernatants of buffered lens homogenates exposed to UVR-A demonstrated a reduction in time-resolved and steady-state fluorescent properties and protein cross-linking.Conclusions: Exposure of the intact lens to UVR-A causes chromophore bleaching without affecting fluorescence, indicating that non-fluorescent chromophores have been destroyed. After homogenization, both chromophores and fluorophores from the lens suffer damage and proteins aggregate. This indicates that powerful mechanisms of protection against UVR-A found in the intact lens are disturbed by homogenization of the lens, suggesting that isolated lens proteins cannot be used as a model system for studying cataractogenesis. Hypothetically, the protective mechanism could be related to the rigidly packed three-dimensional structure of the lens proteins or to the abundance of antioxidative and free radical scavenging defence systems.
Nyckelord
- cataract
- fluorescence
- lens
- ultraviolet radiation
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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