The carp retina was examined by NADPH diaphorase histochemistry to determine if the staining pattern of retinal cells was changed depending on the adaptation state of the retina. When dark-adapted for 5 h, ellipsoids ...The carp retina was examined by NADPH diaphorase histochemistry to determine if the staining pattern of retinal cells was changed depending on the adaptation state of the retina. When dark-adapted for 5 h, ellipsoids of inner segments of both rods and cones and some horizontal cells were heavily stained. Staining was also found in subpopulations of amacrine cells and ganglion cells. In addition, Muller cells were strongly positive for NADPH diaphorase. When light-adapted for 5h, ellipsoids of photoreceptors and ganglion cells were less intensely stained, whereas Muller cells and horizontal cells became negative for NADPH diaphorase. Furthermore, rod ON-center bipolar cells were clearly stained. The difference of staining of amacrine cells between dark- and light-adapted retinas was not significant. The differences in diaphorase-staining pattern between dark- and light-adapted retinas suggest that Muller cells, some horizontal cells and rod ON-center bipolar cells contain inducible nitric oxide synthase, whose induction depends on the adaptation state.展开更多
Objective: Functional significance of NO and central inhibitory neurotransmitter γ-aminobutyric(GABA) during seizures were investigated morphorlogically. Methods: A kainate-induced complex partialseizure model was us...Objective: Functional significance of NO and central inhibitory neurotransmitter γ-aminobutyric(GABA) during seizures were investigated morphorlogically. Methods: A kainate-induced complex partialseizure model was used in our experiment. Twenty SD rats were randomly divided into KA 30, 60, 90, 200min and control groups. The brain sections were stained by NADPh (nicotinamide adenine dinucleotide phosphate ) diaphorase (Nd ) histochemically, and were further stained by GABA immunohistochemically.Results: Histological and immunohistochemical study revealed that in KA groups the number of Nd and GABA-positive double labelled neurons in CA3 region, CA3 region and dentate gyms was significantly reduced,compared with the control group. Conclusion: Nd coexisted with GABA in the brain. Reduction of GABA release led to relief of GABA-ergic inhibition and in the same way, reduction of NO release weakened its negative feedback modulation. Therefore neuronal synchronous paroxysmal discharges increased. GABA and NO,both having antiepileptic action, acted through different ways or different link in the same way. NO may involve in the effect of GABA-ergic neurons and play cooperative antiepileptic action with GABA.展开更多
目的研究Cajal样细胞和一氧化氮合酶(nitric oxide synthase,NOS)表达阳性神经元在成年豚鼠Oddi括约肌(sphincter of Oddi,SO)的分布。方法成年豚鼠SO冷冻切片,c-Kit免疫细胞化学和NADPH-黄递酶组织化学双重染色。结果SO横切面环行平滑...目的研究Cajal样细胞和一氧化氮合酶(nitric oxide synthase,NOS)表达阳性神经元在成年豚鼠Oddi括约肌(sphincter of Oddi,SO)的分布。方法成年豚鼠SO冷冻切片,c-Kit免疫细胞化学和NADPH-黄递酶组织化学双重染色。结果SO横切面环行平滑肌层内可见少量c-Kit阳性细胞,胞体呈梭形,两端伸出细长的突起。纵切面SO的两个壁分别为:外侧壁和十二指肠壁内SO壁,前者与肠壁结构类似,在深肌丛和肌间神经丛周围可见较多的c-Kit阳性细胞;而十二指肠壁内SO壁的肌层内存在大量c-Kit阳性细胞和突起,其形态与肠壁肌层内Cajal细胞相似。NADPH-黄递酶组织化学染色可见NOS表达阳性神经元广泛分布于SO的肌间神经丛和平滑肌内。c-Kit免疫细胞化学和NADPH-黄递酶组织化学双重染色虽未发现二者的共存,但可见c-Kit阳性细胞及突起存在于NOS表达阳性神经元的附近。结论豚鼠SO内存在的Cajal样细胞可能参与SO自主节律性运动的调控,可能是NOS表达阳性神经元对SO运动发挥调节作用的靶细胞。展开更多
基金Project supported by the State Commission of Science and Technology of China,the National Institutes of Health (USA)(EY 08338) and the International Human Frontier Science Program Organization.
文摘The carp retina was examined by NADPH diaphorase histochemistry to determine if the staining pattern of retinal cells was changed depending on the adaptation state of the retina. When dark-adapted for 5 h, ellipsoids of inner segments of both rods and cones and some horizontal cells were heavily stained. Staining was also found in subpopulations of amacrine cells and ganglion cells. In addition, Muller cells were strongly positive for NADPH diaphorase. When light-adapted for 5h, ellipsoids of photoreceptors and ganglion cells were less intensely stained, whereas Muller cells and horizontal cells became negative for NADPH diaphorase. Furthermore, rod ON-center bipolar cells were clearly stained. The difference of staining of amacrine cells between dark- and light-adapted retinas was not significant. The differences in diaphorase-staining pattern between dark- and light-adapted retinas suggest that Muller cells, some horizontal cells and rod ON-center bipolar cells contain inducible nitric oxide synthase, whose induction depends on the adaptation state.
文摘Objective: Functional significance of NO and central inhibitory neurotransmitter γ-aminobutyric(GABA) during seizures were investigated morphorlogically. Methods: A kainate-induced complex partialseizure model was used in our experiment. Twenty SD rats were randomly divided into KA 30, 60, 90, 200min and control groups. The brain sections were stained by NADPh (nicotinamide adenine dinucleotide phosphate ) diaphorase (Nd ) histochemically, and were further stained by GABA immunohistochemically.Results: Histological and immunohistochemical study revealed that in KA groups the number of Nd and GABA-positive double labelled neurons in CA3 region, CA3 region and dentate gyms was significantly reduced,compared with the control group. Conclusion: Nd coexisted with GABA in the brain. Reduction of GABA release led to relief of GABA-ergic inhibition and in the same way, reduction of NO release weakened its negative feedback modulation. Therefore neuronal synchronous paroxysmal discharges increased. GABA and NO,both having antiepileptic action, acted through different ways or different link in the same way. NO may involve in the effect of GABA-ergic neurons and play cooperative antiepileptic action with GABA.
文摘目的研究Cajal样细胞和一氧化氮合酶(nitric oxide synthase,NOS)表达阳性神经元在成年豚鼠Oddi括约肌(sphincter of Oddi,SO)的分布。方法成年豚鼠SO冷冻切片,c-Kit免疫细胞化学和NADPH-黄递酶组织化学双重染色。结果SO横切面环行平滑肌层内可见少量c-Kit阳性细胞,胞体呈梭形,两端伸出细长的突起。纵切面SO的两个壁分别为:外侧壁和十二指肠壁内SO壁,前者与肠壁结构类似,在深肌丛和肌间神经丛周围可见较多的c-Kit阳性细胞;而十二指肠壁内SO壁的肌层内存在大量c-Kit阳性细胞和突起,其形态与肠壁肌层内Cajal细胞相似。NADPH-黄递酶组织化学染色可见NOS表达阳性神经元广泛分布于SO的肌间神经丛和平滑肌内。c-Kit免疫细胞化学和NADPH-黄递酶组织化学双重染色虽未发现二者的共存,但可见c-Kit阳性细胞及突起存在于NOS表达阳性神经元的附近。结论豚鼠SO内存在的Cajal样细胞可能参与SO自主节律性运动的调控,可能是NOS表达阳性神经元对SO运动发挥调节作用的靶细胞。
