Sevoflurane exhibits anesthetic action by inhibiting the auditory cortex, brain stem nitric oxide synthase activity, and reducing nitric oxide （NO）, thereby interfering with the hearing process. However, the influen...Sevoflurane exhibits anesthetic action by inhibiting the auditory cortex, brain stem nitric oxide synthase activity, and reducing nitric oxide （NO）, thereby interfering with the hearing process. However, the influence of sevoflurane on peripheric receptor （cochlea） NO remains poorly understood. Results from the present study showed that sevoflurane downregulated cochlear inducible NO synthase, endothelial NO synthase and neuronal NO synthase expression in a dose dependent manner. This suggests that sevoflurane can decrease cochlear NO synthase expression in a dose dependent manner.展开更多
The relationship between the hypertension and the aging process of hearing organ was investigated Twenty Wistar 3-month old rats and 20 Wistar 12-month old rats, 20 spontaneously hypertensive rat stroke-prone (SHRSP...The relationship between the hypertension and the aging process of hearing organ was investigated Twenty Wistar 3-month old rats and 20 Wistar 12-month old rats, 20 spontaneously hypertensive rat stroke-prone (SHRSP) 3-month old rats and 20 SHRSP 12-month old rats free of middle ear infections as observed under otomicroscopy, with normal tympanic membrane and auricle reflex, were selected to be divided into two experimental groups and two control groups respectively The tail artery blood pressure was measured non-invasively The threshold of auditory brainstem response (ABR) was measured by Spirit TM evoked potential meter The LDH and ChE staining in the inner ear was performed and the optical density was analyzed by the HPIAS analysis system The results showed that there was no difference in the ABR thresholds, the activities of LDH and ChE between Wistar 3-month old group and SHRSP 3-month old group ( P >0 05) The mean value of ABR threshold and the activities of LDH and ChE in the Wistar 12-month old group at relevant sections were significantly greater than those in the two 3-month old groups ( P< 0 05), whereas the mean value of ABR threshold and the activities of LDH and ChE in the SHRSP 12-month old group at relevant sections were significantly higher than those in the 3-month old control group ( P< 0 01) It was concluded that presbycusis existed in the Wistar 12-month old group rats The glycogenosis and the abnormal secretion of neural transmitter were discerned after hypertension All the above factors may worsen the aging of the hearing system展开更多
To investigate the expression of vasoactive intestinal peptide (VIP) and substance P (SP) in the cochlea of spontaneously hypertensive rat (SHR), and to assess the function of VIP and SP in the cochlea following the d...To investigate the expression of vasoactive intestinal peptide (VIP) and substance P (SP) in the cochlea of spontaneously hypertensive rat (SHR), and to assess the function of VIP and SP in the cochlea following the damage of hypertension, hearing thresholds of ABR were observed and the fixative (4% paraformaldehyde) was pumped through the circulatory system. Adult Wistar rats (3 months, n=20) served as the control group and SHRs (3 months, n=20) as the hypertension group. Bullas were taken out and cochleas were irrigated in vitro with the same fixative. The number of base turn's spiral ganglions in the sections was counted. The expression of VIP and SP were detected by SABC method and the images of the sections were analyzed. The number of base turn's spiral ganglsons in the hypertension group was significantly less than in the normal group (P<0.01). VIP and SP were expressed in the spiral ganglion cytoplasma and stria vascularis of the two groups. There were no significant difference in the expression of VIP and SP in spiral ganglion cytoplasma (P>0.05) between the two groups. However, in stria vascularis the expression of VIP in the hypertension group was higher than in the normal group (P<0.05), and no significant difference in SP was found between the two groups. It was suggested that VIP not only contributed to the regulation of the cochlea microcirculation, but also made the neurotransmitter in the pathway of the auditory system. However, SP made only the neurotransmitter in the pathway of the auditory system.展开更多
目的通过观察3-硝基酪氨酸(3-nitrotyrosine,3-NT)在分泌性中耳炎(Otitis Media with Effusion,OME)大鼠内耳的定位、分布及内耳组织形态学特征,确定OME大鼠耳蜗中的酪氨酸硝基化情况,探寻OME导致内耳损伤的酪氨酸硝基化机制。方法将40...目的通过观察3-硝基酪氨酸(3-nitrotyrosine,3-NT)在分泌性中耳炎(Otitis Media with Effusion,OME)大鼠内耳的定位、分布及内耳组织形态学特征,确定OME大鼠耳蜗中的酪氨酸硝基化情况,探寻OME导致内耳损伤的酪氨酸硝基化机制。方法将40只健康成年雄性SD大鼠一侧耳通过阻塞咽鼓管的方法构建分泌性中耳炎模型。造模成功后分组行耳蜗石蜡切片HE染色和免疫组织化学,Tunel凋亡检测和神经节细胞的透射电镜观察。采用SPSS16.0软件包进行统计学分析,以p<0.05作为有显著性差异。结果造模后大鼠的耳蜗毛细胞没有明显的缺失,HE染色发现中耳及内耳慢性炎症改变,免疫组化检测3-NT在耳蜗毛细胞、血管纹、神经纤维细胞、神经节细胞均有阳性表达,而对照组在相应部位均阴性表达。Tunel凋亡检测见耳蜗的神经纤维细胞、神经节细胞出现凋亡。透射电镜观察示神经节细胞线粒体肿胀、出现空泡化,并有神经节细胞间质的淋巴细胞浸润。结论通过构建OME模型初步发现OME能够导致耳蜗损伤,OME可能通过酪氨酸硝基化作用导致耳蜗毛细胞的凋亡、螺旋神经节细胞及神经纤维的变性,即酪氨酸硝基化是OME导致耳蜗损伤的可能机制之一。展开更多
基金the Key Program of Hubei Provincial Education Department, No.D200524008the Scientific Research Foundation Program of Hubei Provincial Health Department, No.JX2C32
文摘Sevoflurane exhibits anesthetic action by inhibiting the auditory cortex, brain stem nitric oxide synthase activity, and reducing nitric oxide （NO）, thereby interfering with the hearing process. However, the influence of sevoflurane on peripheric receptor （cochlea） NO remains poorly understood. Results from the present study showed that sevoflurane downregulated cochlear inducible NO synthase, endothelial NO synthase and neuronal NO synthase expression in a dose dependent manner. This suggests that sevoflurane can decrease cochlear NO synthase expression in a dose dependent manner.
基金ThisprojectwassupportedbyagrantfromtheScienceandResearchFoundtionoftheMinistryofHealth (No 98- 1-139)
文摘The relationship between the hypertension and the aging process of hearing organ was investigated Twenty Wistar 3-month old rats and 20 Wistar 12-month old rats, 20 spontaneously hypertensive rat stroke-prone (SHRSP) 3-month old rats and 20 SHRSP 12-month old rats free of middle ear infections as observed under otomicroscopy, with normal tympanic membrane and auricle reflex, were selected to be divided into two experimental groups and two control groups respectively The tail artery blood pressure was measured non-invasively The threshold of auditory brainstem response (ABR) was measured by Spirit TM evoked potential meter The LDH and ChE staining in the inner ear was performed and the optical density was analyzed by the HPIAS analysis system The results showed that there was no difference in the ABR thresholds, the activities of LDH and ChE between Wistar 3-month old group and SHRSP 3-month old group ( P >0 05) The mean value of ABR threshold and the activities of LDH and ChE in the Wistar 12-month old group at relevant sections were significantly greater than those in the two 3-month old groups ( P< 0 05), whereas the mean value of ABR threshold and the activities of LDH and ChE in the SHRSP 12-month old group at relevant sections were significantly higher than those in the 3-month old control group ( P< 0 01) It was concluded that presbycusis existed in the Wistar 12-month old group rats The glycogenosis and the abnormal secretion of neural transmitter were discerned after hypertension All the above factors may worsen the aging of the hearing system
文摘To investigate the expression of vasoactive intestinal peptide (VIP) and substance P (SP) in the cochlea of spontaneously hypertensive rat (SHR), and to assess the function of VIP and SP in the cochlea following the damage of hypertension, hearing thresholds of ABR were observed and the fixative (4% paraformaldehyde) was pumped through the circulatory system. Adult Wistar rats (3 months, n=20) served as the control group and SHRs (3 months, n=20) as the hypertension group. Bullas were taken out and cochleas were irrigated in vitro with the same fixative. The number of base turn's spiral ganglions in the sections was counted. The expression of VIP and SP were detected by SABC method and the images of the sections were analyzed. The number of base turn's spiral ganglsons in the hypertension group was significantly less than in the normal group (P<0.01). VIP and SP were expressed in the spiral ganglion cytoplasma and stria vascularis of the two groups. There were no significant difference in the expression of VIP and SP in spiral ganglion cytoplasma (P>0.05) between the two groups. However, in stria vascularis the expression of VIP in the hypertension group was higher than in the normal group (P<0.05), and no significant difference in SP was found between the two groups. It was suggested that VIP not only contributed to the regulation of the cochlea microcirculation, but also made the neurotransmitter in the pathway of the auditory system. However, SP made only the neurotransmitter in the pathway of the auditory system.
文摘目的通过观察3-硝基酪氨酸(3-nitrotyrosine,3-NT)在分泌性中耳炎(Otitis Media with Effusion,OME)大鼠内耳的定位、分布及内耳组织形态学特征,确定OME大鼠耳蜗中的酪氨酸硝基化情况,探寻OME导致内耳损伤的酪氨酸硝基化机制。方法将40只健康成年雄性SD大鼠一侧耳通过阻塞咽鼓管的方法构建分泌性中耳炎模型。造模成功后分组行耳蜗石蜡切片HE染色和免疫组织化学,Tunel凋亡检测和神经节细胞的透射电镜观察。采用SPSS16.0软件包进行统计学分析,以p<0.05作为有显著性差异。结果造模后大鼠的耳蜗毛细胞没有明显的缺失,HE染色发现中耳及内耳慢性炎症改变,免疫组化检测3-NT在耳蜗毛细胞、血管纹、神经纤维细胞、神经节细胞均有阳性表达,而对照组在相应部位均阴性表达。Tunel凋亡检测见耳蜗的神经纤维细胞、神经节细胞出现凋亡。透射电镜观察示神经节细胞线粒体肿胀、出现空泡化,并有神经节细胞间质的淋巴细胞浸润。结论通过构建OME模型初步发现OME能够导致耳蜗损伤,OME可能通过酪氨酸硝基化作用导致耳蜗毛细胞的凋亡、螺旋神经节细胞及神经纤维的变性,即酪氨酸硝基化是OME导致耳蜗损伤的可能机制之一。
