Neurturin和神经生长因子对体外培养的神经生长因子受体阳性神经元生长发育的影响

目的探讨Neurturin(NTN)、神经生长因子(NGF)对新生大鼠基底前脑胆碱能神经元生长发育的影响。方法用免疫组化结合图象分析技术观察Neurturin和NGF对培养的新生大鼠基底前脑NGF-R阳性神经元生长发育的作用。结果培养4d时,NTN组的NGF-R阳性神经元细胞数目、突起数、胞体面积和最长突起长度均与对照组有显著性差异(P<0.05),NGF+NTN组各项指标均优于NGF组或NTN组(P<0.05);培养8d时,NTN组除突起数目外其他各项指标均与对照组无显著性差异(P>0.05),NGF+NTN组各项指标仍然均优于NGF组或NTN组(P<0.05);NTN组NGF-R阳性神经元突起数多于NGF组(P<0.05)。结论Neurturin对体外培养的新生大鼠基底前脑NGF-R阳性神经元生长发育有营养作用,但作用时间较短,而且增加突起数的作用较NGF强;Neurturin和NGF的联合作用较单独使用Neurturin或NGF为好。     

EGF培养条件下NGF与BDNF对大鼠海马神经干细胞向神经元分化的差异

目的探讨在表皮生长因子(EGF)培养条件下,相同浓度神经生长因子(NGF)与脑源性神经生长因子(BDNF)对成年大鼠海马神经干细胞向神经元分化比例的差异。方法用含碱性成纤维生长因子(bFGF)、EGF、B27的无血清细胞培养技术体外培养成年大鼠海马神经干细胞,单细胞克隆后行Nestin免疫细胞化学染色,诱导分化1周,行GFAP和NSE免疫细胞化学染色;根据培养液中所加营养因子的不同将单细胞克隆传代细胞分为5组培养:EGF组、NGF组、BDNF组、EGF+NGF组、EGF+BDNF组,此5组细胞培养1周,进行NSE免疫细胞化学染色,计数阳性细胞比例后进行统计学分析。结果:单细胞克隆培养后克隆球细胞表达Nestin,诱导分化1周,细胞表达NSE、GFAP;与EGF组、NGF组、BDNF组相比,EGF+NGF组和EGF+BDNF组细胞分化为神经元的比例较高(P<0.05),其中EGF+BDNF组细胞的比例最高。结论在EGF培养条件下,BDNF促进成年大鼠海马神经干细胞向神经元分化的能力高于NGF。     

NGF、BDNF和NT-3在正常成年大鼠主要脑区表达的免疫组织化学研究

目的研究神经生长因子(NGF)﹑脑源性神经营养因子(BDNF)﹑神经营养素-3(NT-3)在正常成年大鼠主要脑区的表达。方法将正常成年大鼠用4%多聚甲醛灌注固定后取脑制成20μm厚的冰冻切片,应用上述3种因子的抗体进行免疫组织化学染色。结果3种因子的表达既有共同点也有不同点:共同点是在主要脑区都能表达,不同点是在单个细胞中,BDNF主要表达于胞浆边缘;NGF在大部分神经元的整个细胞都表达,但少量神经元则在胞核无表达;NT-3则与BDNF相似。结论3种因子在正常成年大鼠主要脑区都能表达。     

施万样细胞对大鼠脊神经节NGF和BDNF表达的影响

目的观察施万样细胞对坐骨神经损伤(sciatic nerve injury,SNI)大鼠脊神经节NGF和BDNF表达的影响,初步探讨施万样细胞对脊神经节的保护作用。方法先将脂肪源性干细胞(adipose-derived stem cells,ADSCs)诱导分化为施万样细胞并对后者进行鉴定,后将二者分别植入脱细胞神经移植物(ANA)中,构建组织工程神经。大鼠随机分为正常对照组、ADSC组和施万样细胞组。后两组建立SNI模型并用相应的组织工程神经桥接损伤的神经。术后4周采用Western Blot和Real-time PCR检测各组大鼠脊神经节神经生长因子(nerve growth factor,NGF)和脑源性神经营养因子(brainderived neurotrophic factor,BDNF)蛋白和m RNA的表达。结果 ADSCs能够诱导分化为施万样细胞并表达施万细胞标记物S100β和GFAP蛋白。施万样细胞组大鼠脊神经节内NGF和BDNF蛋白及m RNA表达量均高于ADSC组(P0.05)。结论施万样细胞可上调脊神经节NGF和BDNF的表达,对SNI所致的脊神经节内神经元损伤有保护作用。     

Effect of antibodies to nerve growth factor and serum albumin on the development and behavior of mice

We studied physical development, behavioral characteristics, and learning capacity in the off-spring of mice immunized with nerve growth factor and bovine serum albumin. High titer of antibodies to these factors in the blood of pregnant females determines high levels of these antibodies in the blood of their pups. These changes modulate physical development, behavior, and learning capacity of rat pups. The effects of these antibodies differed in the strength and directionality. Antibodies to nerve growth factor more markedly retarded physical development, reduced learning capacity, and considerably increased pain thresholds in animals. Translated fromByulleten’ Eksperimental’noi Biologii i Meditsiny, Vol. 138, No. 7, pp. 98–100, July, 2004     

Effects of testosterone propionate implants in the brain on the sexual behavior and peripheral tissue of the male rat

The effects of testosterone propionate (TP) implanted in medial preoptic-anterior hypothalamic (MPO-AH) area, caudate-putamen, substantia nigra, and reticular formation on the sexual behavior were studied in castrated male rats. Either TP or cholesterol (C) was fused to the inside of 20-gauge cannula and bilaterally implanted in the brain of male rats not exhibiting ejaculatory patterns for 3 successive weeks after castration. Ejaculatory patterns were restored by TP implanted in all of the neural areas studied. No ejaculations were recorded in C-implanted animals. While the MPO-AH implanted animals tended to show ejaculatory patterns more frequently and in more tests than those having implants in other areas, the differences among groups were not statistically significant. Seminal vesicle weights and histological appearance of the seminal vesicles of TP-implanted animals were not reliably different from those implanted with C. Glans penis epithelium, however, was significantly more stimulated in the TP- than in C-implanted animals. Thus, evidence was obtained that androgen from the implants entered the general circulation and reached somatic organs and probably other neural areas. Using the hormone implantation technique, therefore, no reliable evidence was obtained to conclude that the MPO-AH is a special site for selectively utilizing androgen for controlling male sexual behavior.     

Expression of connective tissue growth factor is in agreement with the expression of VEGF, VEGF-C, -D and associated with shorter survival in gastric cancer

Connective tissue growth factor (CTGF) is believed to be a multifunctional signaling modulator involved in a wide variety of biological or pathological processes including carcinogenesis. The role of CTGF in gastric cancer (GC) has not been reported so far. In the present study the expression of CTGF, vascular endothelial growth factor (VEGF), VEGF-C and VEGF-D on immunohistochemistry in GC and the correlation between the expression of CTGF and VEGF, VEGF-C, VEGF-D were examined, along with the correlation between the expression of CTGF and clinicopathological parameters, as well as survival of the patients with GC. The expression of CTGF was significantly in agreement with expression of VEGF, VEGF-C and VEGF-D (kappa and P, respectively: 0.538, P < 0.001; 0.502, P < 0.001; 0.558, P < 0.001). High CTGF expression was significantly associated with lymph nodes metastasis (P = 0.038) and lower postoperative 5 year overall survival rates (23.9%) compared with those patients with low CTGF expression (48.4%, P = 0.0035). The present findings suggest that CTGF is a useful prognostic marker for GC. High CTGF expression is associated with the risk of lymph nodes metastasis and a poor survival time in GC.     

不良心理应激对人卵巢癌荷瘤裸鼠皮下移植瘤生长及表皮生长因子受体、磷酸化蛋白激酶B、血管内皮生长因子蛋白表达的影响

目的 通过观察不良心理应激人卵巢癌荷瘤裸鼠皮下移植瘤的体积、重量和瘤体组织中表皮生长因子受体（EGFR）、磷酸化蛋白激酶B（p-Akt）、血管内皮生长因子（VEGF）蛋白表达情况的差异,探讨其对卵巢癌生长的影响及可能的分子机制。 方法 购置4～6周龄的雌性BALB/c裸鼠,称重,随机分两组,每组12只。A组：荷瘤组皮下移植人卵巢癌组织瘤块,不给予应激;B组：荷瘤+应激组皮下移植人卵巢癌组织瘤块,给予应激。定期测量皮下移植瘤的体积,结束应激实验后的第2天,处死全部组别（A组、B组）裸鼠,剥离肿瘤予以称重,利用免疫组织化学及Western blotting方法对A、B两组皮下移植瘤组织中的EGFR、p-Akt、VEGF蛋白表达情况进行检测。 结果 荷瘤+应激组皮下移植瘤体积及其重量显著高于荷瘤组（P＜0.01）;免疫组织化学实验提示,荷瘤+应激组中皮下移植瘤组织中的EGFR、p-Akt、VEGF蛋白表达水平高于荷瘤组（P<0.05）;Wester blotting提示,荷瘤+应激组皮下移植瘤组织中EGFR、p-Akt、VEGF蛋白表达水平显著高于荷瘤组（P<0.01）。 结论 不良心理应激可能通过EGFR及其介导的下游PI3K/Akt信号通路来促进卵巢癌的发生、发展。     

某食用白酒对大鼠睾丸间质细胞内表皮生长因子、嗜铬颗粒素A的表达及血清睾酮水平的影响

目的:探讨不同时长、不同剂量的贵州某品牌54°食用白酒对大鼠睾丸问质细胞内表皮生长因子(EGF)、嗜铬颗粒素A(CgA)的表达及血清睾酮水平的变化。方法:正常成年雄性SD大鼠,随机分为正常对照组及实验组。采集血清,取睾丸组织。采用免疫组织化学SABC法、图像分析、免疫印迹、化学发光法检测。结果:免疫组织化学显示,EGF、CgA阳性产物存在于睾丸间质细胞胞质内;不同时间点实验组各剂量组EGF及CgA免疫染色强度及平均光密度无明显改变。免疫印迹结果显示,实验组各剂量组EGF蛋白表达水平均无明显改变。各实验组的血清睾酮水平与正常对照组比较未见明显异常,差异无统计学意义。结论:在本实验设定的剂量和时长内,用该品牌54°食用白酒灌胃对睾丸间质细胞内EGF、CgA的表达及血清睾酮水平无明显影响。