巰基氧化劑誘導(dǎo)的氧化脅迫對骨骼肌型鈣釋放通道門控和蛋白交聯(lián)的影響
[Abstract]:When the human body is in extreme environment and pathophysiological state, the redox balance is broken and the oxidation level is increased, which can form the local oxidative stress environment in the cell. Studies have shown that some myocardial and skeletal muscle diseases are associated with oxidative damage of ion channels in the sarcoplasmic omentum. The ryanodine receptor RyR in sarcoplasmic reticulum SR, which is rich in sulfhydryl, is sensitive to redox environment and is the target of oxidative stress. Previous work showed that RyR was severely inhibited under oxidative stress, and the number of free sulfhydryl groups in the protein was greatly reduced. The functional state of calcium release channel (RyR) is closely related to the interaction between other membrane proteins and RyR. To explore the effect of oxidative stress on RyR and its mechanism. In this study, (SR) vesicles and calcium release channel (RyR1) of rabbit skeletal muscle reticulum were used to simulate oxidative stress environment under oxidative stress concentration of Na_2SeO_3 and 1nq, and calcium release channel (RyR1) of rabbit skeletal muscle sarcoplasmic reticulum was studied. Using [3H] -ryanodine binding experiment, SDS-PAGE and Western blotting. photonic coherence spectroscopy (PCS) and DPH fluorescence polarization method were used to investigate the effect of oxidation channel regulator on the particle size distribution and SR membrane fluidity of RyR1 channel active SR protein. The results showed that the pretreatment of Na_2SeO_3 and 1NQ under oxidative stress concentration resulted in the decrease of RyR1 channel activity and the fluidity of SR membrane, and the cross-linking of SR membrane protein. The formation of macromolecular cross-linked complex electrophoresis bands was reversed by DTT, and proteins such as calcium pump myosin and calcium-binding protein were involved in the formation of the complex, and it was found that the treatment of Na _ 2SeO _ 3 and 1N _ (4) NQ resulted in the formation of large particle size polymers between RyR proteins. The average particle size of RyR increases, and DTT can partially reverse the increase. These results suggest that the inhibition of oxidant concentration on RyR1 channel may be due to the oxidation of the functional sulfhydryl group responsible for closing the channel and the formation of abnormal protein accumulation as a result of cross-linking between proteins. Therefore, it may change the functional structure of calcium release channel and decrease the fluidity of SR membrane. It may also induce protein and lipid molecules and the cross-linking between lipid molecules, which may lead to the decrease of flexibility of protein structure. The resulting enhancement of RyR interconnections may also affect the normal synergy between RyR.
【學(xué)位授予單位】:華東師范大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2009
【分類號】:R363
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