安体舒通对糖尿病大鼠血管生成素1和血管生成素2表达的影响

目的观察安体舒通对1型糖尿病大鼠肾皮质血管生成素-1(Ang-1)、血管生成素-2(Ang-2)及肾脏血管重建的影响,并初步探讨其机制。方法建立1型糖尿病大鼠模型,用安体舒通干预8周后观察大鼠肾脏血管重建改变,用放射免疫法测定大鼠血浆及肾组织醛固酮水平,用RT-PCR检测各组肾皮质Ang-1和Ang-2mRNA表达。观察安体舒通对上述指标的影响。结果与糖尿病组相比,安体舒通组大鼠肾血管重建改善,血浆及肾组织醛固酮水平更高,Ang-1和Ang-2mRNA表达减少。结论安体舒通通过拮抗醛固酮的作用,减少Ang-1和Ang-2mRNA表达,改善糖尿病肾血管重建从而发挥肾脏保护作用。     

骨髓间充质干细胞移植脑梗死大鼠：神经功能恢复与突触素的表达

BACKGROUND:Synaptophysin plays an important role in the recovery of neural function after cerebral ischemia. OBJECTIVE:To investigate the effects of bone marrow mesenchymal stem cell transplantation on nervous function and expression of synaptophysin after cerebral infarction. METHODS:Totally 60 rats were equivalently randomized into four groups, including sham operation, control, model and stem cell treatment groups. Rats in the control, model and stem cell treatment groups were used for preparing cerebral infarction models, and the remaining underwent the sham operation. After 1 day of modeling, bone marrow mesenchymal stem cells were transplanted into the rat lateral ventricle in the stem cell treatment group, and rats in the control group was given the injection of the same amount of PBS. After 1, 7 and 14 days of treatment, rat’s neurological function was scored on beam-walking test, rotarod test and screen test, and expression of synaptophysin was detected by RT-PCR and immunohistochemical assay. RESULTS AND CONCLUSION:At 7 and 14 days after treatment, the beam-walking test, rotarod test and screen test scores in the stem cell treatment group were significantly lower than those in the control and model groups (P < 0.05), and the above scores showed no significant differences between the control group and model group (P > 0.05). At 1 day after treatment, the mRNA expression of synaptophysin and the number of synaptophysin-positive cells in the sham operation group were significantly higher than those in the other three groups (P < 0.05); at 7 and 14 days after treatment, the mRNA expression of synaptophysin and the number of synaptophysin-positive cells in the stem cell treatment group were significantly increased compared with the other three groups (P < 0.05), and additionally, the mRNA expression of synaptophysin and the number of synaptophysin-positive cells in the sham operation group were significantly lower than those in the model and control groups (P < 0.05). These findings suggest that bone marrow mesenchymal stem cell transplantation can effectively promote the recovery of neurological function in cerebral infarction rats, and partially promote the formation of synaptophysin.     

血管内皮生长因子与促血管生成素1对大鼠血管内皮细胞的作用

背景：血管内皮生长因子、促血管生成素1是血管形成过程中始动并且使之持续的重要因子,研究其对血管内皮细胞的作用具有重要的意义。 目的：观察血管内皮生长因子与促血管生成素1对培养血管内皮细胞迁移与增殖能力的影响,并探讨其在血管生成方面的作用机制。 方法：在大鼠脐静脉内皮细胞内单独或联合加入血管内皮生长因子、促血管生成素1后,划痕实验和MTT检测对细胞迁移与增殖的影响,观察内皮细胞形态、活性、迁移能力。 结果与结论：划痕实验显示单独血管内皮生长因子作用时,与空白对照组细胞迁移无明显差异,单独促血管生成素1作用时,不仅不能增加细胞的迁移作用,反较空白对照组有所减弱,当血管内皮生长因子与促血管生成素1联合作用时,细胞迁移较空白对照组明显增强;MTT实验结果表明：单纯加入血管内皮生长因子或促血管生成素1,均不能起到有效促进内皮细胞增殖的作用;联合应用血管内皮生长因子及促血管生成素1可有效促进增殖。结果可见当血管内皮生长因子与促血管生成素1联合应用时,才能有效促内皮细胞迁移与增殖,发挥促血管生成作用。     

神经干细胞移植治疗大鼠恢复期脊髓损伤CSCD

背景:研究发现,脊髓损伤后细胞外信号调节激酶在反应性胶质细胞中存在上调现象,且磷酸化的细胞外信号调节激酶急剧增多。目的:验证神经干细胞移植对恢复期脊髓损伤大鼠的功能影响及其在病灶局部的分化及机制。方法:90只SD大鼠被随机分为3组,每组30只。对照组大鼠造模但不进行神经干细胞移植;静脉移植组及局部移植组造模后分别进行神经干细胞移植,分别于移植后的1,2,4,12,24周对各组随机抽取的6只动物后肢功能进行BBB评分及免疫组织化学染色。结果与结论:神经干细胞移植后,静脉移植组和局部移植组病灶局部可见Brdu阳性细胞;大鼠BBB评分逐渐提高,移植4周后静脉移植组和局部移植组BBB评分明显高于同期对照组;大鼠脊髓胶质纤维酸性蛋白、细胞外信号调节激酶1/2逐渐提高,4周达最大值,移植12周后胶质纤维酸性蛋白、细胞外信号调节激酶1/2较同期减少(P<0.05);微管相关蛋白2逐渐提高,4周达最大值,4周以后呈下降趋势,12周后不再有明显变化,但微管相关蛋白2较同期对照组增多(P<0.01)。结果提示,神经干细胞移植后可在病灶局部增殖分化为神经元和神经胶质细胞;两种移植方式的作用没有明显区别;神经胶质细胞再生的过程和细胞外信号调节激酶通路密切相关。     

促红细胞生成素促进脊髓损伤大鼠移植神经干细胞存活和迁移

背景：如何有效促进移植入脊髓损伤组织内的神经干细胞存活和迁移,是目前神经修复研究的重点。 目的：观察促红细胞生成素对脊髓损伤大鼠移植神经干细胞存活、增殖和迁移的影响。 方法：将60只SD大鼠随机分为3组,均制备脊髓横断损伤模型。造模7 d,神经干细胞移植组和促红细胞生成素组于脊髓损伤处移植BrdU标记的神经干细胞7 μL(1×10⁹ L^-1),脊髓损伤对照组移植DMEM/F12培养基;促红细胞生成素组腹腔内注射促红细胞生成素5 000 U/kg,1次/d,连续注射7 d,其余两组注射等量生理盐水。于细胞移植后8周取损伤脊髓组织。 结果与结论：造模2周后,神经干细胞移植组和促红细胞生成素组BBB评分明显高于脊髓损伤对照组(P < 0.05),造模4周后,促红细胞生成素组BBB评分明显高于神经干细胞移植组(P < 0.05)。免疫荧光染色显示促红细胞生成素组大鼠损伤脊髓组织BrdU阳性细胞数量及迁移距离均大于神经干细胞移植组(P < 0.05)。说明促红细胞生成素能促进损伤脊髓组织原位移植的神经干细胞的存活与迁移,加速神经功能修复。     

血管生成素-1激活tyrosine kinase/PDK增加血管内皮细胞[Mg2+]i

目的:探讨血管生成素-1(Ang-1)对人脐静脉内皮细胞(HUVECs)内游离镁离子浓度([Mg2 ]i)的调节机制.方法:我们采用荧光指示剂mag-fura-2,运用PTi阳离子测定系统动态测HUVECs的[Mg2 ]i.结果:Ang-l诱导的[Mg2 ]i增加与细胞外Mg2 浓度无关.Ang-1诱导的[Mg2 ]i增加与细胞内Ca2 浓度无关.经酪氨酸激酶阻断剂(tyrphostin A23和genistein),磷脂酰3激酶阻断剂(wortmannin和LY294002)预处理,均显著阻断Ang-1诱导的[Mg2 ]i增加.但经活化丝裂原激活激酶阻断剂(SB202190和PD98059)预处理,不能阻断Ang-1诱导的[Mg2 ].增加.结论:Ang-1通过酪氨酸激酶/磷脂酰3激酶信号传递途径使细胞内的Mg2 库释放Mg2 ,从而增加HUVECs的[Mg2 ]i.     

神经干细胞移植对脑外伤大鼠神经功能及脑组织Akt表达的影响

目的神经干细胞移植对脑外伤大鼠神经功能及脑组织Akt表达的影响。方法 108只SD成年大鼠随机分为假手术组(36只)、脑外伤组(36只)和神经干细胞移植组(36只)。采用改良的Feeney氏法制作大鼠脑外伤动物模型,损伤1周后在皮质处局部注射移植神经干细胞,分别在细胞移植后的第7天、14天和21天进行神经功能评分。免疫组织化学方法和Western blot方法检测各组大鼠脑组织Akt与p-Akt蛋白的表达。结果脑外伤组大鼠出现明显的神经功能障碍,神经干细胞移植后第7、14和21天大鼠的神经功能评分明显降低(P0.05)。与假手术组相比,不同时间点脑外伤组大鼠脑组织Akt与p-Akt蛋白的表达水平显著降低(P0.05);与相同时间点的脑外伤组大鼠相比,神经干细胞移植组大鼠脑组织的Akt与p-Akt蛋白的表达水平显著升高(P0.05)。结论神经干细胞移植促进脑外伤大鼠神经功能的恢复可能与上调Akt的表达相关。     

血管生成素-1激活tyrosine kinase／PI3K增加血管内皮细胞[Mg^2＋]i

目的：探讨血管生成素-1（Ang-1）对人脐静脉内皮细胞（HUVECs）内游离镁离子浓度（[Mg^2＋]i）的调节机制。方法：我们采用荧光指示剂mag—fura-2，运用PTi阳离子测定系统动态测HUVECs的[Mg^2＋]i。结果：Ang-1诱导的[Mg^2＋]i增加与细胞外Mg^2＋浓度无关。Ang-1诱导的[Mg^2＋]i增加与细胞内Ca^2＋浓度无关。经酪氨酸激酶阻断剂（tyrphostin A23 和 genistein），磷脂酰3激酶阻断剂（wortmannin和LY294002）预处理，均显著阻断Ang-1诱导的[Mg^2＋]i增加。但经活化丝裂原激活激酶阻断剂（SB202190和PD98059）预处理，不能阻断Ang-1诱导的[Mg^2＋]i增加。结论：Ang-1通过酪氨酸激酶／磷脂酰3激酶信号传递途径使细胞内的Mg^2＋库释放Mg^2＋，从而增加HUVECs的[Mg^2＋]i。     

活化素受体样激酶1及其在血管生成中的作用

正血管生成是指新的血管从已存在的毛细血管网生成的过程,受血管生成促进因子和抑制因子的严格调控。通常,血管生成发生于胚胎和出生后早期血管的发育过程中,除女性生理周期和伤口愈合等过程外,在成年阶段血管生成已处于静息状态。但是,在发生某些疾病如肿瘤、糖尿病视网膜病变、心血管疾病及类风湿性关节炎[1-2]时,血管生成过程被异常激活。活化素受体样激酶1(activin receptor-like     

血管生成素-1及其受体Tie-2在小鼠肾发育中的表达

目的:观察血管生成素-1(Ang-1)及其受体Tie-2在小鼠肾发育过程中的表达特征、作用及相互关系.方法:采用免疫组织化学和免疫印迹技术检测胚龄14、16、18 d胎鼠和生后1、3、7、14、21、42 d仔鼠Ang-1和Tie-2的表达.结果:Ang-1在胚龄14 d胎鼠肾的未分化间充质细胞中呈微弱表达,随着胚(日)龄的增加,表达逐渐增强,主要分布在肾小体,间质血管以及肾小管中.Tie-2于胚龄14 d首先出现在肾间质,以后随着肾的发育,出现在肾小体以及间质血管中.结论:Ang-1和Tie-2在小鼠肾发育过程中,对肾小体毛细血管的形成、间质血管的发育及血管稳定性的维持均发挥着重要作用.     

腺病毒介导脑源性神经营养因子与脑出血模型大鼠内源性神经干细胞的分化

BACKGROUND:Previous studies showed that neurotrophic factor has a variety of functions, which can effectively maintain the survival of neurons after injury. OBJECTIVE:To observe the effect of adenovirus-mediated brain-derived neurotrophic factor on the differentiation of endogenous neural stem cells after intracerebral hemorrhage in rats. METHODS:A total of 90 Sprague-Dawley rat models of cerebral hemorrhage were made. At 12 hours after cerebral hemorrhage, 5-bromodeoxyuridine (BrdU) was intraperitoneally injected, twice a day, for 10 consecutive days. After model establishment, rats were randomly divided into three groups, 30 rats in each group, and were respectively subjected to brain stereotaxic injection of adenovirus vector, adenovirus-mediated brain-derived neurotrophic factor and physiological saline. At 1 day, 3 days, 1 week, 2 weeks, 3 weeks, and 4 weeks, neurological deficit score was evaluated. Absorbance value of growth associated protein around the area of hematoma after intracerebral hemorrhage was measured. At 4 weeks after injection, double immunostaining was used to detect the expression of BrdU/NeuN and BrdU/glial fibrillary acidic protein (GFAP).  RESULTS AND CONCLUSION:(1) With the passage of time, nerve function defect score decreased in the three groups. At 1-4 weeks after injection, nerve function deficit scores were lower in the adenovirus-mediated brain-derived neurotrophic factor group than that in the adenovirus vector group and saline group (P < 0.05). (2) With the passage of time, the average absorbance of three groups in the peri-hematoma region first increased and then decreased. The absorbance value was higher in the adenovirus-mediated brain-derived neurotrophic factor group than in the adenovirus vector group and saline group at 3 days-4 weeks (P < 0.05). (3) BrdU/NeuN and BrdU/GFAP rates were significantly higher in the adenovirus-mediated brain-derived neurotrophic factor group than that of adenovirus vector group and saline group (P < 0.05). (4) The results show that the brain-derived neurotrophic factor mediated by adenovirus, and intervention on cerebral hemorrhage in rats can effectively promote the differentiation of endogenous neural stem cells, and promote the recovery of neural function in animal.     

CT灌注成像评价神经干细胞移植脑梗死模型大鼠的神经功能恢复

背景：CT灌注技术是目前临床上较为常用的无创检查方法,可以早期定量检测到脑梗死组织的缺血程度及范围,进而判断脑组织成活与否及其可恢复性。 目的：应用CT灌注技术评价神经干细胞移植脑梗死大鼠的神经功能恢复情况。 方法：60只SD大鼠中随机分为对照组、脑梗死组、移植组,每组20只,后两组制备大脑中动脉梗死模型,建模后24 h,脑梗死组通过尾静脉注射PBS,移植组注射8×105个神经干细胞。分别于细胞移植后的1,3,7,14,28 d行CT灌注成像,移植后1,2,3,4周采用mNSS进行神经功能评分,移植后4周TTC染色计算各组的脑梗死体积,移植后2周苏木精-伊红染色观察脑组织病理变化。 结果与结论：对照组在各个时间点血流动力学未见明显异常,移植组的CT值随时间变化逐渐升高,脑血流量的升高可以增加缺血半暗带神经细胞的存活率。移植组的神经功能评分低于脑梗死组,梗死体积小于脑梗死组(P < 0.05),移植组梗死灶细胞变性坏死程度明显减轻。结果表明CT 灌注成像能够从形态学及血流动力学方面观察神经干细胞移植脑梗死大鼠的神经功能恢复情况。 中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

骨髓单个核细胞移植治疗脑出血

BACKGROUND:It has been proved that bone marrow mononuclear cell transplantation can obviously improve neurological function of rats with cerebral hemorrhage. OBJECTIVE:To investigate the effects of transplanted bone marrow mononuclear cells on the neurological function and apoptosis in perihematomal brain tissues following cerebral hemorrhage in a rat model. METHODS:Twenty-four Sprague-Dawley rats were given stereotaxical injection of collagenase IV into the caudate nucleus to establish cerebral hemorrhage models in transplantation group (n=12) and model group (n=12), and then at 6 hours after cerebral hemorrhage, rats in these two groups were administrated 3x10¹⁰/L allograft bone marrow mononuclear cells and the same amount of PBS, respectively. Another 12 rats were given no interventions as control group. Neurological functions of rats were assessed at 1, 4, 8, 16 days after cerebral hemorrhage; pathological changes of the injury sites were observed at 16 days after transplantation; neuronal apoptosis rates in the perihematomal brain tissue were detected by flow cytometry at 2 and 4 days after transplantation. RESULTS AND CONCLUSION:The modified neurologic severity scores in the transplantation group were significantly lower than those in the model group at 8 and 16 days after cerebral hemorrhage (P < 0.05). In the control group, cells in each layer arranged closely with complete structure, and neurons and glial cells were in good shape; in the model group, perihematomal brain tissues were loose with intercellular gap, in which most neurons and glial cells became necrotic; in the transplantation group, cells in each layer arranged closely and regularly, and glial cell proliferation occurred. Besides, compared with the model group, the neuronal apoptosis rate in the transplantation group was significantly lower (P < 0.05). To conclude, bone marrow mononuclear cells can significantly enhance the neurological function recovery and reduce neuronal apoptosis in the brain of cerebral hemorrhage rats.     

不同年龄脑出血大鼠海马齿状回神经干细胞增殖与分化差异的比较

BACKGROUND:Cerebral hemorrhage can activate the proliferation and differentiation of neural stem cells in the dentate gyrus of the hippocampus. Through continuous differentiation and proliferation, endogenous neural stem cells can gradually replace aging and damaged neurons, thus protecting the brain structure. OBJECTIVE:To compare the difference of the proliferation and differentiation of neural stem cells in the dentate gyrus of the hippocampus of rats with different ages. METHODS:Ninety-six adult rats and 96 aged rats were randomly divided into normal group (n=18 per group), sham operation group (n=12 per group) and cerebral hemorrhage group (model group, n=66 per group), respectively. Cerebral hemorrhage models were made in the two model groups in which, the rats were subjected to cerebral hemorrhage for 6, 24, 48, 72 hours and 7 days, respectively. Then, brain tissues were collected to measure brain water content. BrdU/NeuN and BrdU/GFAP double staining were performed at 3, 7, 14, 21, 28 days after surgery to calculate the number of positive cells. RESULTS AND CONCLUSION:For both adult and aged rats, the brain water content was significantly higher than that in the normal group and sham operation group (P < 0.05), while in the normal and sham operation groups, the brain water content was significantly lower in the aged rats than the adult rats (P  < 0.05). The number of bilateral BrdU-positive cells in the adult and aged model groups was significantly higher than that in the corresponding normal and sham operation groups (P  < 0.05), and moreover, the positive cell number at the hemorrhage side was significantly higher than that at the opposite side (P < 0.05). In addition, the number of BrdU-positive cells at the hemorrhage side in the adult rats was significantly higher than that in the aged rats at different time after cerebral hemorrhage (P  < 0.05). Results from immunohistochemical double staining showed that the BrdU/NeuN and BrdU/GFAP expression in the hippocampal dentate gyrus of adult rats with cerebral hemorrhage was significantly higher than that of normal adult rats. All these experimental results show that there are a few neural stem cells proliferating in the hippocampal dentate gyrus of normal rats, and the proliferation ability is stronger in the adult rats than the aged rats. Cerebral hemorrhage can significantly strengthen the proliferation of neural stem cells in the dentate gyrus in the adult rats compared with the aged rats.     

经颈静脉移植神经干细胞治疗脑性瘫痪

BACKGROUND: Transplanted neural stem cells can survive, proliferate and differentiate into neurons and/or glial cells in the host, thereby promoting partial function recovery in the host.     

针刺联合神经干细胞移植对脑性瘫痪幼鼠模型的作用机制

背景：针灸治疗脑性瘫痪效果显著,神经干细胞治疗也可以改善脑性瘫痪症状,对于针灸和神经干细胞联合治疗脑性瘫痪的研究较少。 目的：观察针刺和神经干细胞联合治疗对脑性瘫痪鼠的影响及其作用机制。 方法：建立幼鼠脑性瘫痪模型,分别给与单纯针刺、单纯神经干细胞移植、针刺和神经干细胞联合治疗,同时设正常对照组和模型组作对比。 结果与结论：与模型组、单纯针刺组、单纯神经干细胞移植组相比,针刺和神经干细胞联合治疗组的脑性瘫痪幼鼠行为学评分明显改善(P < 0.05),神经细胞数量和Bcl-2蛋白表达增高(P < 0.05),凋亡神经细胞数量和Bax蛋白表达降低(P < 0.05)。模型组、单纯针刺组、单纯神经干细胞移植组上述各指标变化差异不显著。结果说明,针刺+神经干细胞联合治疗可以明显改善脑性瘫痪幼鼠的运动学习和记忆能力,减轻神经细胞凋亡,其机制可能与其抑制Bax蛋白表达,上调Bcl-2蛋白表达有关。 中国组织工程研究杂志出版内容重点：干细胞;骨髓干细胞;造血干细胞;脂肪干细胞;肿瘤干细胞;胚胎干细胞;脐带脐血干细胞;干细胞诱导;干细胞分化;组织工程     

Expression of angiopoietin 1, 2 and their common receptor Tie2 in human gastric carcinoma: implication for angiogenesis

Angiogenesis, formation of new microvessels providing oxygen and nutrient supply, is essential for tumor growth. It is dependent on the production of angiogenic growth factors by tumor cells. Angiopoietin 1 (Ang-1) and 2 (Ang-2) and their common receptor, Tie2, are thought to be critical regulators of tumor angiogenesis. We examined expression of Ang-1, Ang-2, and their common receptor Tie2 mRNAs and proteins in gastric cancers using in situ hybridization and immunohistochemistry. We also investigated the relationship between their expression and differentiation of cancer cells, lymph node metastasis, tumor size, depth of cancer cell invasion, TNM staging and microvessel density (MVD). The expression of Ang-1, Ang-2, and Tie2 mRNA in cancer cells significantly correlated with the MVD (p<0.001, <0.001 and =0.019, respectively). Ang-1 and Tie2 positivity correlated with advanced gastric cancers (p<0.05) and larger cancers had higher positive rates of Ang-1, Ang-2, and Tie2 mRNA expression (p<0.001, =0.010 and =0.039, respectively). Significant positive correlations were also found between mRNA expression of Tie2 and those of Ang-1 and Ang-2 (p<0.01 and <0.001, respectively). These findings indicate that the expression of Ang-1 and Ang-2 is important for tumor angiogenesis, and suggest a possible role of autocrine/paracrine function of angiopoietin/Tie2 system in gastric cancer progression.     

骨髓间充质干细胞联合依达拉奉移植脑梗死大鼠血清炎性因子的表达

BACKGROUND:To inhibit the expressions of prothrombin activator inhibitor 1 and tissue plasminogen activator is one potential target for the treatment of cerebral infarction. OBJECTIVE:To investigate the expressions of serum inflammatory cytokines in rats with cerebral infarction undergoing bone marrow mesenchymal stem cell transplantation combined with edaravone. METHODS:Sixty Sprague-Dawley rats were enrolled to prepare models of focal cerebral infarction by middle cerebral artery occlusion, and were randomly divided into four groups. Rats were given intravenous injection of PBS via tail veins for 5 consecutive days as model group, rats were subjected to intravenous injection of 2.0×10⁹ /L bone marrow mesenchymal stem cell suspension (1 mL) via tail veins, twice daily for 5 days as stem cell transplantation group, and those were given intravenous injection of 30 mg edaravone combined with intravenous injection of 2.0×10⁹/L bone marrow mesenchymal stem cell suspension (1 mL) via tail veins for 5 days, twice daily, as combined group. RESULTS AND CONCLUSION:Compared with the model group, modified neurologic severity scores were lower, expressions of serum prothrombin activator inhibitor 1 and tumor necrosis factor-α mRNA in the brain decreased, and the infarct area reduced in the stem cell transplantation and combined groups. And the changed levels of above indicators in the combined group were significantly larger than those of the stem cell transplantation group. In conclusion, combination of bone marrow mesenchymal stem cell transplantation with edaravone can promote neural function recovery after cerebral infarction.     

神经生长因子干预实验性自身免疫性脑脊髓炎幼年大鼠脑神经干细胞的变化

BACKGROUND:Nerve growth factor is a neurotrophic factor that is involved in the cell regulation and promotes the proliferation of neural stem cells. OBJECTIVE:To observe the effect of nerve growth factor on neural stem cells of experimental autoimmune encephalomyelitis rats. METHODS:Wistar rats, 3 weeks of age, were randomly divided into control group, encephalomyelitis model group, nerve growth factor treatment group. Rat models of experimental autoimmune encephalomyelitis were made in the latter two groups. On the day of onset, rats in the nerve growth factor treatment group were given intraperitoneal injection of 1 000 U/kg nerve growth factor for 7 continuous days, and rats in the other two groups given no treatment. Effects of nerve growth factor on clinical symptoms of model rats were observed. Expression of Brdu in the subependymal zone and Brdu⁺/GFAP⁺ expression in the cortex were detected. RESULTS AND CONCLUSION:Rat models of experimental autoimmune encephalomyelitis appeared to have encephalomyelitis symptoms successively at the beginning of 10-day immunization, while rats in the control group had no symptoms of encephalomyelitis. In the model group, glial cell hyperplasia, inflammatory cell infiltration, damage to vascular endothelial cell proliferation, and perivascular aggregation of inflammatory cells in the rat brain were found, while no abnormal changes in the rat brain were found in the control group. Compared with the model group, the expression of Brdu in the subependymal zone and Brdu⁺/GFAP⁺ expression in the cortex were both higher in the model group (P < 0.05), and these expressions were also higher in the nerve growth factor treatment group than the model group at 7 and 21 days after onset (P < 0.05). To conclude, these findings suggest that the rat model of autoimmune encephalomyelitis can be successfully established, and nerve growth factor treatment can improve clinical symptoms of experimental autoimmune encephalomyelitis rats by promoting the proliferation and differentiation of neural stem cells into astrocytes.