We previously showed that the repair of bone defects is regulated by neural and vascular signals. In the present study, we examined the effect of topically applied β-nerve growth factor（β-NGF） on neurogenesis and ...We previously showed that the repair of bone defects is regulated by neural and vascular signals. In the present study, we examined the effect of topically applied β-nerve growth factor（β-NGF） on neurogenesis and angiogenesis in critical-sized bone defects filled with collagen bone substitute. We created two symmetrical defects, 2.5 mm in diameter, on either side of the parietal bone of the skull, and filled them with bone substitute. Subcutaneously implanted osmotic pumps were used to infuse 10 μgβ-NGF in PBS（β-NGF ＋ PBS） into the right-hand side defect, and PBS into the left（control） defect, over the 7 days following surgery. Immunohistochemical staining and hematoxylin-eosin staining were carried out at 3, 7, 14, 21 and 28 days postoperatively. On day 7, expression of β III-tubulin was lower on the β-NGF ＋ PBS side than on the control side, and that of neurofilament 160 was greater. On day 14, β III-tubulin and protein gene product 9.5 were greater on the β-NGF ＋ PBS side than on the control side. Vascular endothelial growth factor expression was greater on the experimental side than the control side at 7 days, and vascular endothelial growth factor receptor 2 expression was elevated on days 14 and 21, but lower than control levels on day 28. However, no difference in the number of blood vessels was observed between sides. Our results indicate that topical application of β-NGF promoted neurogenesis, and may modulate angiogenesis by promoting nerve regeneration in collagen bone substitute-filled defects.展开更多
The human immunodeficiency virus type 1 gag p20 gene fragment was clonedinto plasmid pBV220 to construct a recombinant expression plasmid pCY7.By induction,the p20 protein was expressed in E.coli,and it was confirmed ...The human immunodeficiency virus type 1 gag p20 gene fragment was clonedinto plasmid pBV220 to construct a recombinant expression plasmid pCY7.By induction,the p20 protein was expressed in E.coli,and it was confirmed by Western blotting thatthe expressed p20 protein could be specifically recognized by anti-p17 monoclonalantibodies.The recombinant bacteria was lysed and fractionated into snpernatant andprecipitate by centrifugation.It was found that the p20 protein was present chiefly inthe precipitate.After p20 protein being washed twice,its purity reached 27.4%.Then theprecipitate was washed with 1 mol/L urea solution and the purity of p20 protein wasraised to 58.1%.Finally,the precipitate was dissolved in 6mol/L of urea and appliedonto a heparin affinity column.Four peaks were obtained and the p20 protein wasfound mainly in peak 3.The purity of p20 protein at this step reached 84.2% as meas-ured by gel scanning.展开更多
目的:探讨沉香化气胶囊对糖尿病(diabetes mellitus,DM)大鼠小肠Cajal间质细胞(interstitial cells of Cajal,ICC)、肌间神经丛的影响.方法:将健康♂SD大鼠分为正常对照组、DM模型组、DM模型+中药组.大鼠一次性腹腔注射(ip)链脲佐菌素(S...目的:探讨沉香化气胶囊对糖尿病(diabetes mellitus,DM)大鼠小肠Cajal间质细胞(interstitial cells of Cajal,ICC)、肌间神经丛的影响.方法:将健康♂SD大鼠分为正常对照组、DM模型组、DM模型+中药组.大鼠一次性腹腔注射(ip)链脲佐菌素(STZ,60mg/kg)造模,选取成功模型,DM模型+中药组每天给予中药灌胃,模型组和正常对照组每天给予同等容量的蒸馏水,持续灌胃4wk.所有大鼠干预4wk结束后,给予印度墨汁灌胃测定小肠传输速率,利用免疫组织化学和图像分析观察十二指肠c-Kit、突触素(synaptophysin,Syn)、蛋白基因产物9.5(protein gene product 9.5,PGP9.5)的表达.结果:灌胃4wk后,DM模型+中药组小肠传输速率均比DM模型组明显增加(71.26±5.22 vs 45.52±6.42,P<0.01),仍低于对照组(71.26±5.22 vs 80.40±7.33,P<0.05);DM模型+中药组c-Kit、突触素、PGP9.5的阳性产物面积和吸光度值均比DM模型组明显增加(443.28±24.40 vs 358.83±35.03,832.33±58.78 vs 488.83±58.56,889.17±82.75 vs 445.17±64.06,0.16±0.02 vs 0.13±0.02,0.25±0.02 vs 0.16±0.01,0.24±0.02 vs 0.15±0.01,均P<0.01),仍低于正常对照组(443.28±24.40 vs 557.28±42.35,P<0.01;832.33±58.78 vs 937.67±101.23,P<0.05;889.17±82.75 vs 1050.50±90.22,P<0.01;0.16±0.02 vs 0.18±0.02,P<0.05;0.25±0.02 vs 0.29±0.03,P<0.01;0.24±0.02 vs 0.27±0.02,P<0.01).结论:沉香化气胶囊可以促进糖尿病大鼠小肠肌间神经丛c-Kit、突触素和PGP9.5的表达,提示对受损的DM大鼠小肠ICC、肌间神经丛有部分恢复作用,从而对糖尿病大鼠的胃肠动力障碍有一定的改善效应.展开更多
本研究旨在阐明骨形态发生蛋白15(Bone morphogenetic protein 15,BMP15)基因多态性与邵伯鸡母系产蛋性状之间的关系,为鸡繁殖性状的标记辅助选择提供科学依据。采用PCR-RFLP技术检测261只邵伯鸡母系BMP15的基因多态性,用最小二乘法分...本研究旨在阐明骨形态发生蛋白15(Bone morphogenetic protein 15,BMP15)基因多态性与邵伯鸡母系产蛋性状之间的关系,为鸡繁殖性状的标记辅助选择提供科学依据。采用PCR-RFLP技术检测261只邵伯鸡母系BMP15的基因多态性,用最小二乘法分析该基因多态性与邵伯鸡母系产蛋性状的关系。发现BMP15基因外显子1序列中存在3个多态位点C397T、A474G和C594T,其中C397T位点C→T的突变使亮氨酸变为苯丙氨酸,经RFLP检测,3个多态位点均发现3种基因型。χ2检验表明,邵伯鸡母系在这3个位点均处于Hardy-Weinberg平衡。用最小二乘法分析这3个位点的多态性与邵伯鸡母系产蛋性状之间的关系,结果发现,C397T位点TT基因型个体的开产日龄显著早于CT型个体(P<0.05),TT型个体的300日龄产蛋数显著高于CT型个体(P<0.05);A474G位点AA、AG和GG型个体间的各性状差异均不显著(P>0.05);C594T位点CC型个体的开产日龄显著早于CT与TT型个体。3个位点的合并基因型TTAATT对开产日龄、开产体质量、开产蛋质量、300日龄平均蛋质量、300日龄产蛋数均有显著影响(P<0.05)。对于邵伯鸡母系而言,TTAATT是最有利基因型,本研究结果初步表明,BMP15基因合并基因型TTAATT可以作为邵伯鸡母系产蛋性状潜在的DNA分子标记。展开更多
基金supported by the Fujian Foundation for Distinguished Young Scientists in China,No.Grant#2060203the National Natural Science Foundation of China,No.31070838
文摘We previously showed that the repair of bone defects is regulated by neural and vascular signals. In the present study, we examined the effect of topically applied β-nerve growth factor（β-NGF） on neurogenesis and angiogenesis in critical-sized bone defects filled with collagen bone substitute. We created two symmetrical defects, 2.5 mm in diameter, on either side of the parietal bone of the skull, and filled them with bone substitute. Subcutaneously implanted osmotic pumps were used to infuse 10 μgβ-NGF in PBS（β-NGF ＋ PBS） into the right-hand side defect, and PBS into the left（control） defect, over the 7 days following surgery. Immunohistochemical staining and hematoxylin-eosin staining were carried out at 3, 7, 14, 21 and 28 days postoperatively. On day 7, expression of β III-tubulin was lower on the β-NGF ＋ PBS side than on the control side, and that of neurofilament 160 was greater. On day 14, β III-tubulin and protein gene product 9.5 were greater on the β-NGF ＋ PBS side than on the control side. Vascular endothelial growth factor expression was greater on the experimental side than the control side at 7 days, and vascular endothelial growth factor receptor 2 expression was elevated on days 14 and 21, but lower than control levels on day 28. However, no difference in the number of blood vessels was observed between sides. Our results indicate that topical application of β-NGF promoted neurogenesis, and may modulate angiogenesis by promoting nerve regeneration in collagen bone substitute-filled defects.
基金Supported by the National Science Foundation of China No.39100029
文摘The human immunodeficiency virus type 1 gag p20 gene fragment was clonedinto plasmid pBV220 to construct a recombinant expression plasmid pCY7.By induction,the p20 protein was expressed in E.coli,and it was confirmed by Western blotting thatthe expressed p20 protein could be specifically recognized by anti-p17 monoclonalantibodies.The recombinant bacteria was lysed and fractionated into snpernatant andprecipitate by centrifugation.It was found that the p20 protein was present chiefly inthe precipitate.After p20 protein being washed twice,its purity reached 27.4%.Then theprecipitate was washed with 1 mol/L urea solution and the purity of p20 protein wasraised to 58.1%.Finally,the precipitate was dissolved in 6mol/L of urea and appliedonto a heparin affinity column.Four peaks were obtained and the p20 protein wasfound mainly in peak 3.The purity of p20 protein at this step reached 84.2% as meas-ured by gel scanning.
文摘目的:探讨沉香化气胶囊对糖尿病(diabetes mellitus,DM)大鼠小肠Cajal间质细胞(interstitial cells of Cajal,ICC)、肌间神经丛的影响.方法:将健康♂SD大鼠分为正常对照组、DM模型组、DM模型+中药组.大鼠一次性腹腔注射(ip)链脲佐菌素(STZ,60mg/kg)造模,选取成功模型,DM模型+中药组每天给予中药灌胃,模型组和正常对照组每天给予同等容量的蒸馏水,持续灌胃4wk.所有大鼠干预4wk结束后,给予印度墨汁灌胃测定小肠传输速率,利用免疫组织化学和图像分析观察十二指肠c-Kit、突触素(synaptophysin,Syn)、蛋白基因产物9.5(protein gene product 9.5,PGP9.5)的表达.结果:灌胃4wk后,DM模型+中药组小肠传输速率均比DM模型组明显增加(71.26±5.22 vs 45.52±6.42,P<0.01),仍低于对照组(71.26±5.22 vs 80.40±7.33,P<0.05);DM模型+中药组c-Kit、突触素、PGP9.5的阳性产物面积和吸光度值均比DM模型组明显增加(443.28±24.40 vs 358.83±35.03,832.33±58.78 vs 488.83±58.56,889.17±82.75 vs 445.17±64.06,0.16±0.02 vs 0.13±0.02,0.25±0.02 vs 0.16±0.01,0.24±0.02 vs 0.15±0.01,均P<0.01),仍低于正常对照组(443.28±24.40 vs 557.28±42.35,P<0.01;832.33±58.78 vs 937.67±101.23,P<0.05;889.17±82.75 vs 1050.50±90.22,P<0.01;0.16±0.02 vs 0.18±0.02,P<0.05;0.25±0.02 vs 0.29±0.03,P<0.01;0.24±0.02 vs 0.27±0.02,P<0.01).结论:沉香化气胶囊可以促进糖尿病大鼠小肠肌间神经丛c-Kit、突触素和PGP9.5的表达,提示对受损的DM大鼠小肠ICC、肌间神经丛有部分恢复作用,从而对糖尿病大鼠的胃肠动力障碍有一定的改善效应.
文摘本研究旨在阐明骨形态发生蛋白15(Bone morphogenetic protein 15,BMP15)基因多态性与邵伯鸡母系产蛋性状之间的关系,为鸡繁殖性状的标记辅助选择提供科学依据。采用PCR-RFLP技术检测261只邵伯鸡母系BMP15的基因多态性,用最小二乘法分析该基因多态性与邵伯鸡母系产蛋性状的关系。发现BMP15基因外显子1序列中存在3个多态位点C397T、A474G和C594T,其中C397T位点C→T的突变使亮氨酸变为苯丙氨酸,经RFLP检测,3个多态位点均发现3种基因型。χ2检验表明,邵伯鸡母系在这3个位点均处于Hardy-Weinberg平衡。用最小二乘法分析这3个位点的多态性与邵伯鸡母系产蛋性状之间的关系,结果发现,C397T位点TT基因型个体的开产日龄显著早于CT型个体(P<0.05),TT型个体的300日龄产蛋数显著高于CT型个体(P<0.05);A474G位点AA、AG和GG型个体间的各性状差异均不显著(P>0.05);C594T位点CC型个体的开产日龄显著早于CT与TT型个体。3个位点的合并基因型TTAATT对开产日龄、开产体质量、开产蛋质量、300日龄平均蛋质量、300日龄产蛋数均有显著影响(P<0.05)。对于邵伯鸡母系而言,TTAATT是最有利基因型,本研究结果初步表明,BMP15基因合并基因型TTAATT可以作为邵伯鸡母系产蛋性状潜在的DNA分子标记。
