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· 16O8· 西部医学2013年l1月第25卷第11期 Med J West China,November 2013,Vo1.25,No.11 不同固定方法对细胞免疫荧光染色结果的影响 * 李 冉,杨文理,覃 扬,魏玲,沈文燕,刘秋英,俞小琴 (四川大学华西基础医学与法医学院生物化学与分子生物学教研室,四川成都610041) 【摘要】 目的 比较不同的固定方法对细胞内胞浆蛋白Vigilin和核蛋白CTCF的免疫荧光染色结果的影响。方 法在免疫染色前,分别采用四种方法对HepG2细胞进行固定及通透:①纯甲醇一2O℃处理8min后,再用8O 丙酮一 2O℃处理1min。②甲醇:丙酮的1:1混合溶剂一2O℃处理10min。③在方案2的基础上,再用0.1 Triton-X一1。0冰上 通透10rain。④4 多聚甲醛室温固定10min后,用0.1 Triton-X一100冰上通透10min。结果采用方案①、②、③、④ 得到的胞浆蛋白vigilin在细胞内的大致分布无明显差异,但用方案④处理后,染色效果更为清晰而能更好地观察到细 胞的细微结构;另外,采用方案①和方案②处理细胞后,对核蛋白CTCF进行免疫染色,可见CTCF分布于胞浆;方案③ 中,在纯甲醇固定后,若用0.1 Triton—X—100通透,则CTCF显示主要分布于细胞核内,胞质内亦有阳性染色;方案④的 通透条件下,CTCF特异性分布于细胞核,胞质内几乎无阳性染色。结论响很大,应针对抗原特点,采用适宜的固定方法,以得到正确的实验结果。 【关键词】 固定方法;免疫荧光;胞浆蛋白;核蛋白 【中图分类号】R-331;R 446.61 【文献标识码】A doi:10.3969/j.issn.1672—3511.2013.II.003 不同的固定及通透方法对免疫染色的结果影 The effects of different fixation methods on cellular immunofluorescence LI Ran,YANG Wen。Ij,QIN Yang,et al (Department of Biochemistry and Molecular Biology.West China Preclinical and Forensic College of Sichuan University Sichuan University,Chengdu 6 1004 1) [Abstract]Objective To evaluate the effects of different fixation methods on immunostaining of cytoplasmic pro— tein Vigilin and nuclear protein CTCF respectively.Methods HepG2 cells were fixed and permeabilized by four methods as following:①cells were soaked in pure methanol for 8min at一20 ̄C and in acetone at the same temperature for Imin consecutively;②Cells were soaked in the 1:1 ratio of mixture of methanol and acetone for 10 rain,一2O℃.③On the basis of Method②,cells were permeablized with 0.1 Triton—X一100 on ice.④Cells were fixed by 4 PFA,followed by being permeablized with 0.1 Triton—X一100 on ice.Results There is no significant difference among the approximately cellular location of Vigilin by methods①一④,while the subtle cellular structure could be obtained by method④.Besides,CTCF were distributed in cytoplasm after the procedure of methods①or②.As in method③,if cells were permeabilized by 0.1 ATri0ton—X—i00 after the fixation of pure methano1.CTCF were majorly distributed in nuclei with less positive staining in cytoplasm.After