差速贴壁结合神经营养因子3体外纯化培养人胚嗅鞘细胞

目的:采用差速贴壁结合神经营养因子3的方法对人胚嗅球嗅鞘细胞进行原代纯化培养,探讨简单实用的嗅鞘细胞体外培养方法。方法:将差速贴壁后人胚嗅鞘细胞间隔48h用含100mL/L胎牛血清和含NT3的DF12培养液交替进行体外培养。观察嗅鞘细胞的生长变化,采用形态学和P75免疫细胞化学染色进行细胞及纯度鉴定。结果:体外培养的人胚嗅鞘细胞P75染色呈阳性反应,呈双极、三极细胞,细胞突起细长,并可形成细胞突起网络。在体外培养9d时可以获得95%的嗅鞘细胞,12d时为83%,且细胞状态良好。结论:差速贴壁法结合间断NT3应用是一种简单实用的嗅鞘细胞纯化培养方法。     

经改良的取材和差速贴壁法培养纯化嗅黏膜嗅鞘细胞

目的:采用经改良的取材和差速贴壁法培养纯化嗅黏膜嗅鞘细胞(OECs),以探求更加简单、高效的嗅黏膜OECs取材和培养纯化方法.方法:成年雄性SD大鼠6只,采用经改良的方法剥取嗅黏膜,然后用改良差速贴壁法培养纯化嗅黏膜OECs.倒置相差显微镜下观察细胞生长情况以及形态并照相,培养7 d、14 d细胞行NGFRp75免疫细胞化学染色鉴定,并根据免疫细胞化学染色结果计算细胞纯度.结果:体外培养的嗅黏膜OECs形态主要有扁圆形或油煎蛋形、梭形或双极、多突起形.嗅黏膜OECs NGFRp75免疫细胞化学染色阳性.培养7 d嗅黏膜OECs纯度为90%,培养14 d嗅黏膜OECs纯度为85%.嗅黏膜OECs最长可以存活35 d.结论:经改良的取材和差速贴壁法培养纯化嗅黏膜OECs具有简单、高效的优点,培养的嗅黏膜OECs的纯度完全可以达到细胞移植的要求.     

人胚嗅球嗅鞘细胞原代培养的实验研究

目的拟建立人胚胎嗅球嗅鞘细胞的培养方法并探讨这些细胞在活性、纯度方面是否具备临床应用水平。方法用含有促进细胞生长的谷氨酰胺、转铁蛋白、生物素、硒酸纳的无血清纯化液纯化嗅鞘细胞,胰蛋白酶消化收集细胞,制成单细胞悬液。采用台盼蓝染色法进行活性测定,P75NGFR和S-100双标免疫荧光染色鉴定,以Hoechst复染鉴定OECs的纯度。结果可见比较典型的嗅鞘细胞:双极或梭形、多突起形和扁圆形,主要以梭形和多突起形细胞为主。细胞活性大于95%,纯度大于90%。结论实验建立的人胚胎嗅球嗅鞘细胞原代培养的方法可行,细胞活性大于95%,纯度和均一性已达到临床应用水平。     

新生大鼠嗅鞘细胞的改良培养方法研究

目的:探讨新生大鼠嗅鞘细胞的分离、培养和纯化方法。方法:取2 d内的新生大鼠嗅球组织,在解剖显微镜下分离取材,原代培养嗅鞘细胞,运用差速贴壁法和差速贴壁+阿糖胞苷+细胞生长刺激因子法两种方法进行纯化,在倒置显微镜下观察不同培养时间嗅鞘细胞的形态、数量和NGFRp75抗体免疫荧光结果,统计嗅鞘细胞的纯度。结果:嗅鞘细胞的纯度分别是差速贴壁组平均为60.41%±4.32%,差速贴壁+阿糖胞苷+细胞生长刺激因子法组平均为84.98%±4.03%。两组数据用t检验进行统计学分析,差异有统计学意义(P<0.05)。结论:取材于新生大鼠;显微镜下分离脑膜;差速贴壁+阿糖胞苷+细胞生长刺激因子法纯化,都是良好的嗅鞘细胞培养方法。     

嗅鞘细胞的培养纯化及形态学特征

目的　建立体外培养纯化嗅鞘细胞 (Olfactoryensheathingcells,OECs)的模型 ,观察OECs生长状态和形态学变化 ,为研究神经再生获得丰富OECs来源奠定基础。方法　以原代培养的方法分离、培养成年大鼠嗅球OECs,再用阿糖胞苷抑制 ,P75抗体吸附方法纯化及Forskolin和牛垂体提取液 (bovinepituitaryextract,BPE)营养物质综合作用。根据P75免疫组化学染色结果统计所得OECs的纯度 ,同时对不同培养时期的OECs的形态进行观察。结果　 (1)此纯化方法所得的OECs纯度可达 95 %以上 ,细胞增殖速度较快 ,且细胞纯度不因培养时间的延长而明显下降。 (2 )未纯化前细胞形态多变 ,主要为巨噬细胞状、双极和多极状 ;纯化后 2～ 4天 ,OECs多呈双极或多极状 ;突起短小 ;4天后 ,OECs以突起细长的双极和三极为主 ,细胞走向一致 ,呈平行排列。结论　P75抗体吸附方法纯化效率高 ,Forskolin和BPE能够促进细胞的增殖 ,并影响细胞的形态及排布     

一种新的培养嗅鞘细胞方法(英文)

为了建立一种新的培养嗅鞘细胞的方法,从而为神经诱导修复材料的研究提供种子细胞。本研究取新生鼠的嗅球最外两层经胰蛋白酶消化成单细胞悬液,经差速贴壁法纯化,观察并记录其形态特征;经HE染色以及神经生长因子蛋白受体p75(NGFR-p75)和S-100免疫组化染色鉴定并计算其纯度。结果显示,获得的嗅鞘细胞突起呈双极或三级,p75和S-100阳性细胞纯度达到91%。上述结果提示该方法经济易行,所获得的嗅鞘细胞纯度高、活性好。     

大鼠嗅鞘细胞体外培养及免疫组化研究

目的：建立体外纯化培养嗅鞘细胞（olfactory ensheathing cells，OECs）的稳定方法并观察培养嗅鞘细胞（OECs）形态学特征。方法：原代培养成年雄性SD大鼠嗅球的嗅神经层和颗粒层中提取的OECs，利用差速贴壁和阿糖胞苷（Ara-c）抑制法除去混杂的成纤维细胞和星形胶质细胞以获得纯化的OECs。用P75抗体免疫组织化学染色鉴定OECs，计算纯化度。结果：此方法获得的OECs纯度可达93％以上。OECs的外形主要以突起细长的双极和三极为主，或无突起呈“煎蛋样”，随时间延长细胞生长排列呈现一定方向性。结论：此方法稳定易复制，可获得高纯度的OECs。     

阿糖胞苷结合神经生长因子体外纯化培养大鼠嗅鞘细胞

背景：由于嗅鞘细胞终生具有成髓鞘能力,如何利用简单而又经济的方法获得大量较高纯度的嗅鞘细胞是脊髓损伤研究的热点。 目的：分析阿糖胞苷结合神经生长因子对大鼠嗅球源性嗅鞘细胞纯化培养的可行性。 方法：将差速贴壁后的大鼠嗅鞘细胞首先用含10 mg/L阿糖胞苷的完全培养基培养24 h,然后用含体积分数为1%胎牛血清和25 μg/L神经生长因子的DMEM/F12培养基进行体外培养。观察嗅鞘细胞的生长变化,采用形态学和免疫组化染色对细胞及其纯度进行鉴定。 结果与结论：体外培养的大鼠嗅鞘细胞神经生长因子受体NGFRp75染色呈阳性反应,细胞呈双极和三级,伸出细长突出,并渐结成网状,在体外培养的第7天纯度为95%,第9天时为90%,且形态良好。结果提示阿糖胞苷结合神经生长因子是一种简单实用的嗅鞘细胞纯化培养方法。     

嗅成鞘细胞条件培养基对PC12细胞促分化作用及对分化后细胞损伤的保护作用

目的研究嗅成鞘细胞条件培养基(OECCM)对PC12细胞促分化作用及其对-OH自由基损伤分化后细胞的保护作用。方法采用原代分离培养的方法培养和纯化嗅成鞘细胞,收集其培养上清作为OECCM,然后用其培养PC12细胞,培养3 d后,进行细胞形态学观察及-βtubulin免疫细胞化学染色,同时在同一批细胞中加入100μmol/L FeSO4和50μmol/L H2O2作用20 min,再用OECCM继续培养48 h,然后进行MTT对细胞活性进行检测和存活细胞计数。结果用OECCM培养的PC12细胞长有突起,形态酷似神经元,并且-βtubulin免疫细胞化学染色呈阳性,而对照组细胞在同样培养时间里,没有明显的形态变化,-βtubulin染色呈阴性。用FeSO4和H2O2产生的-OH自由基对分化后的PC12细胞进行损伤,发现继续用OECCM培养后,反映细胞活性的A值为0.346 5±0.032,对照组0.201 8±0.034(P<0.01);同时两组细胞存活数目的百分比分别为:实验组为(56.7±5.9)%,对照组为(23.8±7.4)%(P<0.01)。结论嗅成鞘细胞可以分泌有促PC12细胞分化作用的分子和对分化后的细胞在损伤时有保护作用的分子。     

人鼻腔嗅粘膜嗅鞘细胞的原代培养和免疫组化观察

目的 建立人鼻腔嗅粘膜嗅鞘细胞（OECS）的体外培养方法。方法 利用鼻窦镜选取上鼻甲嗅区粘膜，原代培养嗅鞘细胞，进行形态学观察。结果 成功培养出人鼻腔嗅粘膜OECs，为扁平的双极、多极形态，对P75、GFAP呈阳性反应，纯度在50％左右。结论 人鼻腔嗅粘膜培养OECs的方法实用可行，但须在取材部位和纯化方面进一步探讨。     

成年大鼠嗅神经鞘细胞纯化培养的研究

嗅神经鞘细胞(olfactoryensheathingcells,OECs)是目前用于神经再生研究较为理想的移植细胞,为了建立一种可以有效获得高纯度、高均一性的OECs培养方法,本实验采用2. 5月的大鼠嗅球为实验材料进行OECs培养,同时结合OECs的生物学特点在培养8d后,通过用硝酸纤维素膜吸附p75抗体,再对培养的OECs进行免疫亲和吸附和对成纤维细胞进行补体杀伤来纯化OECs, 在纯化后分别对培养2、4、6、8d的OECs进行p75免疫组化染色和纯度鉴定。实验结果发现,本研究采用的OECs纯化培养方法所获得OECs纯度在4个不同培养时间点都达到98%以上,说明此方法是一种高效率的纯化培养OECs的方法。     

The Immunohistochemical Characterization of Human Fetal Olfactory Bulb and Olfactory Ensheathing Cells in Culture as a Source for Clinical CNS Restoration

Clinical studies have expanded the therapeutic olfactory ensheathing cells (OECs) transplantation to different human Central Nervous System (CNS) diseases. In fact, the OEC transplantation in clinic is a mixture of olfactory bulb cells; they even have not demonstrated that they have such a subpopulation yet. However, as a source of OECs transplantation, the development and identification of human fetal OECs are still need more understanding, because some surgery try to restoration CNS injury with a more purity of OEC cultures generated by a number of different procedures. In this article, twelve human fetal olfactory bulb (OB) samples were obtained from six fetuses in 20 weeks of gestation, it was studied by immunofluorescence on histological sections and cultured cells with multiple antibodies under confocal microscopy. The P75NTR positive OB‐OECs (olfactory ensheathing cell from the olfactory bulb) were present in both outer olfactory nerve layers and glomerular layer. The percentage of OB cells in culture, about 22.31 was P75NTR positive, 45.77 was S100β, and 31.92 was GFAP. P75NTR and GFAP were coexpressed with S100β, respectively; however, P75NTR was not coexpressed with GFAP in human fetal OECs. It is suggested that the localization and development of human OECs in OB are different to those in rodent, and the P75NTR immunohistological staining is still necessary to identify and characterize human fetal OECs in culture before transplantation. Anat Rec, 2010. © 2009 Wiley‐Liss, Inc.     

Culture and purification of human fetal olfactory ensheathing cells using different attachment rates combined with intermittent NT3 nutrition

Objective:To explore a simple and pragmatic method to obtain sufficient olfactory ensheathing cells from human fetus by selective attachment of harvested cells combined with intermittent NT3 nutrition. Methods:DMEM/F12 culture solution including 10% fetal bovine serum or NT3 was used to culture olfactory ensheathing cells intermittently every 48 h. The cell state and growth rates of OECs were observed, and P75 staining was used to estimate the purity of the cells. Results:Human fetal OECs were positive with P75 immunocytochemical staining. OECs in dipolar or tripolar shape formed networks by their processes in vitro. The purity of OECs in "good state" was about 95% at 9 d and 83% on 12 d, respectively. Conclusion:The method of using different attachment rates combined with intermittent NT3 addition is a simple and effective way to culture and purify OECs.     

嗅鞘细胞对神经干细胞增殖与分化的影响

观察嗅鞘细胞(OECs)对神经干细胞(NSCs)增殖与分化的影响。取孕14d的SD胚鼠嗅球和腹侧中脑组织,分为OECs+NSCs共培养组和NSCs单独培养组进行培养。用p75免疫组化法,p75、BrdU/nestin、GFAP、NF(神经原纤维)和p75/nestin免疫荧光法分别鉴定OECs和NSCs并观察其增殖与分化。在培养7d时,绝大多数OECs呈梭形且发出2~3个突起,少量呈扁平椭圆形,两者均呈p75阳性。在7d时,单独培养的NSCs表现为典型的神经球悬浮生长,呈BrdU/nestin阳性;14d后偶见神经球贴壁分化,球中的少数细胞呈绿色荧光标记的NF阳性,大部分呈GFAP阳性。在5d时,OECs+NSCs共培养组形成神经球;10d时球体积不断增大,球心透亮度良好;12d后神经球的体积不再增大,开始贴附在OECs上生长,可见神经球向四周伸出突起并开始分化;14d时NSCs紧贴OECs生长并同OECs广泛交织在一起,可见NSCs和OECs分别呈nestin和p75阳性,NSCs中的大部分呈NF阳性,小部分为GFAP阳性。NSCs单独培养组和OECs+NSCs共培养组中NF阳性细胞率分别为47.2%和69.5%,前者明显少于后者(P<0.05)。以上研究结果提示OECs有促进NSCs增殖和诱导其分化的作用。     

Alpha-crystallin promotes rat olfactory ensheathing cells survival and proliferation through regulation of PI3K/Akt/mTOR signaling pathways

Transplantation of cultured olfactory ensheathing cells (OECs) into lesions can promote axonal regeneration. However, the acutely injured CNS environment affects the survival and proliferation of OECs which might impair its therapy effects. To investigate whether α-crystallin can promote the survival and proliferation of OECs, OECs were cultured with α-crystallin. The survival of OECs was assessed by counting the numbers of p75-labeled OECs. Cellular proliferative activity was estimated by flow cytometry and quantification of BrdU-labeled cells. Phosphorylated p85, Akt and mammalian target of rapamycin (mTOR) were detected when OECs were culture for 7 days. Our results showed that the numbers of p75-labeled or Brdu-labeled OECs in α-crystallin group were much more than that in control group. And α-crystallin increased the phosphorylation of both p85, Akt and mTOR. LY294002 abrogated the ability of α-crystallin to phosphorylate Akt and mTOR, and decreased the percentage of cells in S and G2/M stage which were treated with α-crystallin. These findings indicated that α-crystallin positively regulated the activation of PI3K/Akt/mTOR signaling pathway and promote the proliferation and survival of cultured OECs.