Correlation between Hyper-Sensitivity to Hydrogen Peroxide and Low Defense against Ca2+ Influx in Cataractogenic Lens of Ihara Cataract Rats
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概要
- 論文の詳細を見る
Our previous studies have demonstrated that lipid peroxidation in the lenses of hereditary cataract model rats (Ihara cataract rat (ICR)/f rats) caused a dysfunction in Ca2+ regulation. In the present study, we investigated the effect of in vitro hydrogen peroxide (H2O2) stimulation on lipid peroxide (LPO) and the activities of sarco-/endoplasmic reticulum and plasma membrane Ca2+-ATPase (SERCA and PMCA) in the ICR/f rat lenses. An increase in LPO level and decreases in the SERCA and PMCA activities were observed with increasing H2O2 concentration, and pretreatment with diethyldithiocarbamate, a potent radical scavenger, attenuated these changes in normal and ICR/f rat lenses. The glutathione levels, glutathione peroxidase and glutathione reductase activities are significantly lower in ICR/f rat lenses than in normal rat lenses. Furthermore, we presented as two kinetic parameters such as DP (defense point) and Ks (reactive constant) analyzed from above various biological responses vs. H2O2 concentration–profile curves using a one-exponential equation. The DPs for LPO, SERCA and PMCA in ICR/f rat lenses is lower than in normal rat lenses. In contrast to the results in DP, the Ks for LPO, SERCA and PMCA in ICR/f rat lenses is higher than in normal rat lenses. In addition, the closed relationship of was observed between DP and Ks for LPO, SERCA and PMCA. These results show that the resistance to H2O2 in the ICR/f rat lenses is lower than that of normal rats. The DP and Ks values can provide an useful information for resistances to various stimuli in cells and tissues.
- 公益社団法人 日本薬学会の論文
著者
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Ito Yoshimasa
School Of Pharmacy Kinki Univ.
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Ito Yoshimasa
Faculty Of Pharmaceutical Sciences Kinki University
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Nagai Noriaki
School Of Pharmacy Kinki Univ.
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Nagai Noriaki
School Of Pharmaceutical Sciences Kindai University
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Takeuchi N
Showa Pharmaceutical University
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TAKEUCHI Noriko
Section of Biochemistry, Faculty of Pharmacy, Meijo University
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Nagai Noriaki
Faculty of Pharmacy, Kinki University
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Takeuchi N
Meijo Univ. Nagoya Jpn
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Takeuchi Noriko
Section Of Biochemistry Faculty Of Pharmacy Meijo University
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