Objective The purpose of this study is to identify the molecular basis of the contacting -neuron membrane K+ conductance in glia cells of native bovine retina. Methods RT-PCR, Northern blot and Western blot analyses w...Objective The purpose of this study is to identify the molecular basis of the contacting -neuron membrane K+ conductance in glia cells of native bovine retina. Methods RT-PCR, Northern blot and Western blot analyses were used to detect the expression of the inwardly rectifying K+ (Kir) channel subunits Kir2.1 in native bovine RPE and neural retina. The distribution of Kir2.1 protein was determined in frozen sections of bovine retina-RPEchoroid by indirect immunofluorescence analysis. Results RT-PCR analysis reveals Kir2.1 transcript in both RPE and neural retina. In Northern blots, Kir2.1 probe hybridizes to an appropriately sized-transcript in neural retina but not in RPE. In Western blots, Kir2.1 antibody recognizes a major monomer of about 60 kDa in neural retina but not in RPE. Immunofluorescence reveals that Kir2.1 immunostaining is expressed at many parts of Muller cells, especially in the membrane domains of Muller cells that contact retinal neurons, i. e. , along the two stem processes,over the soma, and in the side branches extending into the synaptic layers. No immunostaining is seen in RPE. Doubling staining shows that Kir2.1 proteins and glutamine synthetase proteins which are a marker of Muller cell co-localized well. Conclusions These results reveal that Kir2.1 is localized in the Muller cells, no Kir2.1 in RPE. These data suggests that Kir2.1 may be involved in the transport of K+ in the bovine neural retina.展开更多
目的:探讨清心开窍方有效成分对AD大鼠海马区IL-1β、GFAP及Aβ表达的影响。方法:动物实验采用对照观察法。雄性SD大鼠112只,称体质量后按随机数字表分为7组:正常组、假手术组,模型组、安理申组,皂苷组、挥发油组、多糖组,每组16只。采...目的:探讨清心开窍方有效成分对AD大鼠海马区IL-1β、GFAP及Aβ表达的影响。方法:动物实验采用对照观察法。雄性SD大鼠112只,称体质量后按随机数字表分为7组:正常组、假手术组,模型组、安理申组,皂苷组、挥发油组、多糖组,每组16只。采用双侧海马注射Aβ1-40制造AD大鼠模型,造模后第2天开始灌胃,连续灌胃2周(每天上午10点开始),清心开窍方皂苷组、清心开窍方挥发油组、清心开窍方多糖组剂量分别是9、3.33、8.33 m L/(kg·d),安理申组给药剂量为1.67 mg/(kg·d),予对照组和模型组等体积生理盐水。2周后,采用免疫组化、实时定量荧光PCR及WB法检测AD大鼠海马区IL-1β、GFAP及Aβ表达。结果:清心开窍方各有效成分组大鼠海马区IL-1β、GFAP及Aβ表达水平降低,与对照组比较差异非常显著(P<0.01,P<0.05)。结论:清心开窍方有效成分可能是通过降低海马区IL-1β、GFAP及Aβ的表达发挥抗AD的作用。展开更多
文摘Objective The purpose of this study is to identify the molecular basis of the contacting -neuron membrane K+ conductance in glia cells of native bovine retina. Methods RT-PCR, Northern blot and Western blot analyses were used to detect the expression of the inwardly rectifying K+ (Kir) channel subunits Kir2.1 in native bovine RPE and neural retina. The distribution of Kir2.1 protein was determined in frozen sections of bovine retina-RPEchoroid by indirect immunofluorescence analysis. Results RT-PCR analysis reveals Kir2.1 transcript in both RPE and neural retina. In Northern blots, Kir2.1 probe hybridizes to an appropriately sized-transcript in neural retina but not in RPE. In Western blots, Kir2.1 antibody recognizes a major monomer of about 60 kDa in neural retina but not in RPE. Immunofluorescence reveals that Kir2.1 immunostaining is expressed at many parts of Muller cells, especially in the membrane domains of Muller cells that contact retinal neurons, i. e. , along the two stem processes,over the soma, and in the side branches extending into the synaptic layers. No immunostaining is seen in RPE. Doubling staining shows that Kir2.1 proteins and glutamine synthetase proteins which are a marker of Muller cell co-localized well. Conclusions These results reveal that Kir2.1 is localized in the Muller cells, no Kir2.1 in RPE. These data suggests that Kir2.1 may be involved in the transport of K+ in the bovine neural retina.
文摘目的:探讨清心开窍方有效成分对AD大鼠海马区IL-1β、GFAP及Aβ表达的影响。方法:动物实验采用对照观察法。雄性SD大鼠112只,称体质量后按随机数字表分为7组:正常组、假手术组,模型组、安理申组,皂苷组、挥发油组、多糖组,每组16只。采用双侧海马注射Aβ1-40制造AD大鼠模型,造模后第2天开始灌胃,连续灌胃2周(每天上午10点开始),清心开窍方皂苷组、清心开窍方挥发油组、清心开窍方多糖组剂量分别是9、3.33、8.33 m L/(kg·d),安理申组给药剂量为1.67 mg/(kg·d),予对照组和模型组等体积生理盐水。2周后,采用免疫组化、实时定量荧光PCR及WB法检测AD大鼠海马区IL-1β、GFAP及Aβ表达。结果:清心开窍方各有效成分组大鼠海马区IL-1β、GFAP及Aβ表达水平降低,与对照组比较差异非常显著(P<0.01,P<0.05)。结论:清心开窍方有效成分可能是通过降低海马区IL-1β、GFAP及Aβ的表达发挥抗AD的作用。
