The dynamic changes in CAP, and EP in the scale media were examined with single micropipet during anoxia and reventilation with oxygen. Also, the morphologic changes in IHC, OHC and synapse were observed in this exper...The dynamic changes in CAP, and EP in the scale media were examined with single micropipet during anoxia and reventilation with oxygen. Also, the morphologic changes in IHC, OHC and synapse were observed in this experiment. It was found that the amplitude of SP and EP values declined with alteration in polarity of these value. The changes in polarity and amplitude of SP followed the changes of CAP threshold induced by anoxia. The histologic examinations revcaled no cvidence of acetylcholinesterase (AChE) alteration in the synapse and no succinict dehydrogenase (SDH) changes in IHC appeared. However, the activity of SDH in the OHC decreased. The results suggest that the polarity and amplitude of SP were influenced passively by the changes of EP value. In addition, the change of SP polarity from positive tonegative during anoxia is due to the loss of mudulation process of OHC to IHC, while the SP polarity from negative to positive during the supply of oxygen is caused by regain of the modulation process of OHC.展开更多
目的探讨热休克蛋白(heat shock protein,HSP)70的诱导表达对豚鼠耳蜗听功能的影响。方法将经白噪声预刺激(100 dB SPL,45 min)诱导耳蜗产生HSP70的豚鼠与无预刺激的正常豚鼠同时暴露于强噪声(125 dB SPL,90 min)中,观察强噪声刺激后不...目的探讨热休克蛋白(heat shock protein,HSP)70的诱导表达对豚鼠耳蜗听功能的影响。方法将经白噪声预刺激(100 dB SPL,45 min)诱导耳蜗产生HSP70的豚鼠与无预刺激的正常豚鼠同时暴露于强噪声(125 dB SPL,90 min)中,观察强噪声刺激后不同时间的听性脑干反应(ABR)阈值。结果100 dB SPL的白噪声能诱导耳蜗HSP70的表达。强刺激后12 h,两组间ABR阈值无显著差异(P>0.05);强刺激后60 和108 h,预刺激组的ABR阈值均低于无预刺激组(P<0.01)。在预刺激组内,108 h ABR阈值低于60 h ABR阈值(P<0.05),而在无预刺激组内,108和60 h ABR阈值无显著差异(P>0.05)。结论经预刺激诱导耳蜗产生的HSP70对豚鼠耳蜗听功能具有保护作用。展开更多
文摘The dynamic changes in CAP, and EP in the scale media were examined with single micropipet during anoxia and reventilation with oxygen. Also, the morphologic changes in IHC, OHC and synapse were observed in this experiment. It was found that the amplitude of SP and EP values declined with alteration in polarity of these value. The changes in polarity and amplitude of SP followed the changes of CAP threshold induced by anoxia. The histologic examinations revcaled no cvidence of acetylcholinesterase (AChE) alteration in the synapse and no succinict dehydrogenase (SDH) changes in IHC appeared. However, the activity of SDH in the OHC decreased. The results suggest that the polarity and amplitude of SP were influenced passively by the changes of EP value. In addition, the change of SP polarity from positive tonegative during anoxia is due to the loss of mudulation process of OHC to IHC, while the SP polarity from negative to positive during the supply of oxygen is caused by regain of the modulation process of OHC.
文摘目的探讨热休克蛋白(heat shock protein,HSP)70的诱导表达对豚鼠耳蜗听功能的影响。方法将经白噪声预刺激(100 dB SPL,45 min)诱导耳蜗产生HSP70的豚鼠与无预刺激的正常豚鼠同时暴露于强噪声(125 dB SPL,90 min)中,观察强噪声刺激后不同时间的听性脑干反应(ABR)阈值。结果100 dB SPL的白噪声能诱导耳蜗HSP70的表达。强刺激后12 h,两组间ABR阈值无显著差异(P>0.05);强刺激后60 和108 h,预刺激组的ABR阈值均低于无预刺激组(P<0.01)。在预刺激组内,108 h ABR阈值低于60 h ABR阈值(P<0.05),而在无预刺激组内,108和60 h ABR阈值无显著差异(P>0.05)。结论经预刺激诱导耳蜗产生的HSP70对豚鼠耳蜗听功能具有保护作用。