目的研究Long Evans大鼠不同发育阶段视网膜神经节细胞(Retinal Ganglion Cells, RGCs)电生理学特性,认识视觉发育过程中视网膜神经元成熟的细胞内机制.方法取出生后3～31 d Long Evans大鼠,制备视网膜片,寻找RGCs行膜片钳全细胞记录,...目的研究Long Evans大鼠不同发育阶段视网膜神经节细胞(Retinal Ganglion Cells, RGCs)电生理学特性,认识视觉发育过程中视网膜神经元成熟的细胞内机制.方法取出生后3～31 d Long Evans大鼠,制备视网膜片,寻找RGCs行膜片钳全细胞记录,给予不同强度去极化脉冲,诱发动作电位.结果 33只Long Evans大鼠共获得94个RGCs,按动作电位类型RGCs分为单锋型、瞬变型和持续型,在视觉发育不同阶段,3种类型的RGCs所占比例不同,在电生理特性上有显著差异.结论在视觉发育过程中,RGCs的电学特性逐渐成熟,动作电位的幅度、频率存在差异,提示不同类型的RGCs在编码及传递时间、空间视觉信息中具有不同作用.展开更多
目的研究出生后不同发育阶段Wistar大鼠视网膜神经节细胞(RGCs)的膜学特性,包括被动膜学特性和去极化脉冲诱发的动作电位(Action potential,AP),并分析其与年龄的关系.方法应用视网膜切片膜片钳全细胞记录技术,获得7～30 d Wistar大鼠...目的研究出生后不同发育阶段Wistar大鼠视网膜神经节细胞(RGCs)的膜学特性,包括被动膜学特性和去极化脉冲诱发的动作电位(Action potential,AP),并分析其与年龄的关系.方法应用视网膜切片膜片钳全细胞记录技术,获得7～30 d Wistar大鼠视网膜神经节细胞的膜片钳全细胞记录.结果①记录了112个视网膜神经节细胞;②随着发育,RGCs的膜学特性发生显著变化,兴奋性增加,睁眼前组与睁眼后组间有显著性差异;③去极化脉冲诱发其产生的动作电位有3种形式:单峰型、瞬变型、持续型.随着视觉发育,单峰型逐渐减少,持续型逐渐增加,细胞成熟时未见到单峰型,只见到瞬变型和持续型.随着发育,RGCs的电生理特性发生显著变化.结论①睁眼后形觉刺激促进RGCs膜学特性的成熟;②随着发育,RGCs的AP类型发生显著变化,单峰型是RGCs发育过程中的一种前期状态,最终分化为瞬变型和持续型RGCs.展开更多
Objective: To investigate the effects of nerve growth factor(NGF)on proliferation and DNAthesis of cultured human fetal retinal pigment epithelium (RPE)cells in vitro.Methods: Primary culture and subculture of human f...Objective: To investigate the effects of nerve growth factor(NGF)on proliferation and DNAthesis of cultured human fetal retinal pigment epithelium (RPE)cells in vitro.Methods: Primary culture and subculture of human fetal retinal pigment epithelium cellswere established in vitro first. Cultured RPE cells were treated with NGF by variousconcentrations 0μg/L, 50μg/L, 100μg/L, 200μg/L and 300μg/L(final concentration)for 48 hs.After 48 hs, cells proliferation was measured with methyl thiazolyl tetrazolium(MTT)assay method and the amount of DNA was determined by the absorbance at 280nm of nucleic acid & protein analysis.Results: The A values of 100 μg/L, 200 μg/L, 300 μg/L NGF was(0. 213 7 ± 0. 23 3),(0. 218 8 ±0. 018 1), (0. 232 2 ±0. 016 4) as compared with(0. 189 7 ±0. 015 2) of Avalue of 0 μg/L NGF respectively, q value was 3.63,4.40, 6. 42 and P value was0. 015, 0. 000, 0. 000(q-test). The DNA concentrations of 100 μg/L, 200 μg/L, 300μg/L and 400 μg/L NGF was (981. 220 4 ± 123.535 7), (1 375. 848 4 ±244. 471 8),(1 658.707 1 ± 176. 938 1), (2 353.086 3 ±609. 906 4) μg/ml as compared with(666. 818 8 ± 141. 330 2) μg/ml of DNA concentration of 0 μg/L NGF respectively, qvalue was 3.63,8.20,11.47,19.46, P value was 0. 024,0. 000,0. 000,0. 000 (q-test).Conclusion: The data suggested that NGF could stimulate the proliferation and DNAsynthesis of cultured of hRPE cells in vitro in a dose-dependent manner.展开更多
文摘目的研究Long Evans大鼠不同发育阶段视网膜神经节细胞(Retinal Ganglion Cells, RGCs)电生理学特性,认识视觉发育过程中视网膜神经元成熟的细胞内机制.方法取出生后3～31 d Long Evans大鼠,制备视网膜片,寻找RGCs行膜片钳全细胞记录,给予不同强度去极化脉冲,诱发动作电位.结果 33只Long Evans大鼠共获得94个RGCs,按动作电位类型RGCs分为单锋型、瞬变型和持续型,在视觉发育不同阶段,3种类型的RGCs所占比例不同,在电生理特性上有显著差异.结论在视觉发育过程中,RGCs的电学特性逐渐成熟,动作电位的幅度、频率存在差异,提示不同类型的RGCs在编码及传递时间、空间视觉信息中具有不同作用.
文摘目的研究出生后不同发育阶段Wistar大鼠视网膜神经节细胞(RGCs)的膜学特性,包括被动膜学特性和去极化脉冲诱发的动作电位(Action potential,AP),并分析其与年龄的关系.方法应用视网膜切片膜片钳全细胞记录技术,获得7～30 d Wistar大鼠视网膜神经节细胞的膜片钳全细胞记录.结果①记录了112个视网膜神经节细胞;②随着发育,RGCs的膜学特性发生显著变化,兴奋性增加,睁眼前组与睁眼后组间有显著性差异;③去极化脉冲诱发其产生的动作电位有3种形式:单峰型、瞬变型、持续型.随着视觉发育,单峰型逐渐减少,持续型逐渐增加,细胞成熟时未见到单峰型,只见到瞬变型和持续型.随着发育,RGCs的电生理特性发生显著变化.结论①睁眼后形觉刺激促进RGCs膜学特性的成熟;②随着发育,RGCs的AP类型发生显著变化,单峰型是RGCs发育过程中的一种前期状态,最终分化为瞬变型和持续型RGCs.
文摘Objective: To investigate the effects of nerve growth factor(NGF)on proliferation and DNAthesis of cultured human fetal retinal pigment epithelium (RPE)cells in vitro.Methods: Primary culture and subculture of human fetal retinal pigment epithelium cellswere established in vitro first. Cultured RPE cells were treated with NGF by variousconcentrations 0μg/L, 50μg/L, 100μg/L, 200μg/L and 300μg/L(final concentration)for 48 hs.After 48 hs, cells proliferation was measured with methyl thiazolyl tetrazolium(MTT)assay method and the amount of DNA was determined by the absorbance at 280nm of nucleic acid & protein analysis.Results: The A values of 100 μg/L, 200 μg/L, 300 μg/L NGF was(0. 213 7 ± 0. 23 3),(0. 218 8 ±0. 018 1), (0. 232 2 ±0. 016 4) as compared with(0. 189 7 ±0. 015 2) of Avalue of 0 μg/L NGF respectively, q value was 3.63,4.40, 6. 42 and P value was0. 015, 0. 000, 0. 000(q-test). The DNA concentrations of 100 μg/L, 200 μg/L, 300μg/L and 400 μg/L NGF was (981. 220 4 ± 123.535 7), (1 375. 848 4 ±244. 471 8),(1 658.707 1 ± 176. 938 1), (2 353.086 3 ±609. 906 4) μg/ml as compared with(666. 818 8 ± 141. 330 2) μg/ml of DNA concentration of 0 μg/L NGF respectively, qvalue was 3.63,8.20,11.47,19.46, P value was 0. 024,0. 000,0. 000,0. 000 (q-test).Conclusion: The data suggested that NGF could stimulate the proliferation and DNAsynthesis of cultured of hRPE cells in vitro in a dose-dependent manner.
