碱性成纤维细胞生长因子及其对生殖的影响

碱性成纤维细胞生长因子（ｂＦＧＦ）是成纤维细胞生长因子（ＦＧＦ）家族中的主要成员，广泛分布于动物机体中，影响细胞的生长，分化和功能，本文在系统介绍ｂＦＧＦ的生化特性，来源，分布以及一般生物学效应的基础上，着重介绍了ｂＦＧＦ对生殖调控方面的研究进展。     

碱性成纤维细胞生长因子对牛骨骼肌卫星细胞增殖的影响

为研究碱性成纤维细胞生长因子(basic fibroblast growth factor,bFGF)对牛骨骼肌卫星细胞增殖的影响,试验对牛骨骼肌卫星细胞进行体外分离培养,在生长培养基和分化培养基中分别添加bFGF,观察细胞生长及分化情况,绘制细胞生长曲线,并进行EDU细胞增殖检测试验。结果显示,添加了bFGF培养基的细胞生长状态较对照组良好,细胞增殖速度快,细胞增殖率显著高于对照组(P<0.05),说明bFGF对牛骨骼肌卫星细胞在生长培养基和分化培养基中增殖都具有良好的促进作用。本研究建立了一种高效的牛骨骼肌卫星细胞培养方案,为骨骼肌卫星细胞的研究利用提供参考。     

重组人碱性成纤维细胞生长因子的药效试验

上海白种猪经麻醉后灼伤造模 ,形成单位创面直径 2 .5ｃｍ ,深Ⅱ度烫伤 ,作为药效学观察之动物模型 ,以进口Ｐｒｏｍｅｇａ产品为阳性对照。每天肌肉注射重组人碱性成纤维细胞生长因子ｂＦＧＦ注射剂 ,每日 1次 ,连续 1 0天。注射后第 3天就可观察到创面愈合程度的差异性 ,给药组与空白对照组呈现显著差异 ,给药组中与进口对照的同剂量组显现出相似的愈合效果。1　材料与方法以小型精猪制成深Ⅱ度烫伤模型 ,观察重组人碱性成纤维细胞生长因子的药效 ,并以进口Ｐｒｏｍｅｇａ产品为阳性对照。1 .1　受试药物ｒｈｂＦＧＦ由中国人民解放军第一…     

家蚕核型多角体病毒成纤维细胞生长因子基因的表达和定位

为了解杆状病毒基因组中成纤维细胞生长因子基因(fgf)的功能,分离纯化了BmNPV DNA,采用PCR方法获得了BmNPV的fgf基因,并克隆至原核表达载体pET28 a,构建了高效原核表达质粒pET28 af-gf。通过IPTG诱导表达后,经SDS-PAGE检测证实了在27 kD左右有一特异条带,与预测的蛋白质分子量大小一致,并通过N i2+-NTA离子交换树脂亲和纯化了目的蛋白。同时构建了融合GFP的真核表达载体pCDNA3.1-gfp-fgf,通过脂质体转染进入COS-7细胞进行表达和定位观察。fgf基因产物定位于细胞核。     

牛分枝杆菌MPB70基因的克隆及其在大肠杆菌中的表达

本研究以牛分枝杆菌Vallee111染色体DNA为模板,以MPB70成熟蛋白基因特异性引物进行PCR扩增,获得约500bp的DNA片段.通过T-A克隆技术,将PCR产物克隆至pGEM-T Vector中,成功地构建出克隆载体pGEM-T-70.以BamH Ⅰ和EcoR Ⅰ双酶切pGEM-T-70和pET28a( ),并将纯化的MPB70基因亚克隆至pET28a( )中,构建出原核表达载体pET28a-70.将pET28a-70转化至感受态E.coli BL21(DE3)中,经IPTG诱导和SDS-PAGE分析,可见约25Ku外源蛋白带.Western blot分析发现,该蛋白具有牛分枝杆菌抗原性,从而为进一步研究MPB70的亚单位疫苗及DNA疫苗奠定基础.     

碱性成纤维细胞生长因子对犬穿透性角膜移植愈合效果的组织学观察

为探索碱性成纤维细胞生长因子(bFGF)对犬穿透性角膜移植(PKP)术后角膜愈合效果,选取24只健康犬接受角膜移植,随机分为4组:手术对照组(A)、地塞米松组(B)、地塞米松+环孢菌素A组(C)、地塞米松+环孢菌素A+bFGF组(D),所有犬术后均接受妥布霉素点眼,在术前(0 d)和术后14 d、35 d制作角膜组织切片,观察角膜结构变化。结果显示:A组犬角膜基质层纤维排列混乱,上皮恢复速度较慢,35 d时存在上皮与基质层分离现象;B、C组角膜基质层纤维排列不规则,上皮细胞完整覆盖创面;D组角膜基质层纤维排列整齐,上皮层恢复速度最快,角膜表面平滑。结果表明:bFGF与妥布霉素、地塞米松和环孢菌素A联用可促进PKP术后角膜上皮层和基质层的愈合,为临床上犬角膜移植的术后治疗提供参考。     

牛分枝杆菌Ag85B基因的克隆及其在大肠杆菌中的表达

以牛分枝杆菌Vallee111染色体DNA为模板．根据已发表的Ag85B成熟蛋白基因的核苷酸序列设计合成特异性引物进行PCR扩增．获得约860bp的DNA片段。通过T-A克隆技术．将PCR产物克隆至pGEM-T载体中．成功地构建出克隆载体pGEM-T-85B。以BamHⅠ和EcoRⅠ双酶切pGEM-T-85B和pET28a（＋）．并将纯化的Ag85B基因亚克隆至pET28a（＋）中，构建出原核表达载体pET28a-85B。将pET28a-85B转化至感受态E.coli BL21（DE3）中．经IPTG诱导和SDS-PAGE分析．可见约30000的外源蛋白带。Western blot分析发现，该蛋白具有牛分枝杆菌抗原性．从而为进一步研究Ag85B的亚单位疫苗及DNA疫苗奠定了基础。     

南阳牛BoLA-DRA基因的克隆及其在大肠埃希菌中的表达

为克隆南阳牛BoLA-DRA基因,构建原核表达载体并研究该基因在大肠埃希菌中的表达。从南阳牛脾脏组织中提取总RNA,利用RT-PCR方法扩增得到BoLA-DRA基因,将其克隆至pGEM-Teasy克隆载体上,转化感受态细胞DH5α,经测序鉴定后,进一步亚克隆至原核表达载体pGEX-4T-1中,构建出重组表达质粒,经IPTG诱导表达。结果表明,本试验成功克隆了大小为917 bp的BoLA-DRA基因,重组质粒pGEX-4T-DRA在大肠埃希菌中以包涵体形式表达,表达产物经SDS-PAGE和Western blot鉴定大小为54.4 ku,与预期结果一致。为进一步研究该蛋白的功能及制备抗体奠定了基础。     

牛胎儿皮肤成纤维细胞体外培养及其特性研究

该试验研究了牛胎儿皮肤成纤维细胞的分离、培养、纯化方法及其生长特征.牛胎儿皮肤细胞贴壁传代2～4次.可成功获得均一稳定的成纤维细胞群体.取传至4代的牛胎儿皮肤成纤维细胞进行细胞计数,并绘制其生长曲线.     

牛病毒性腹泻病毒E0基因的原核表达与活性检测

参考牛病毒性腹泻病毒(bovine viral diarrhea virus,BVDV)基因组序列设计1对引物,扩增出650 bp的E0基因片段。将目的片段克隆至pMD18-T载体,经酶切鉴定获得阳性重组质粒并对其进行测序。将E0基因定向亚克隆到pET32a表达载体中,酶切及测序鉴定正确后,转化BL21表达菌,经IPTG诱导得到了以包涵体形式表达的重组蛋白。重组蛋白经亲和层析法纯化后,免疫印迹检测证明纯化的重组蛋白具有良好的活性。     

Production of bioactive bovine fibroblast growth factor 4 in E. coli based on the common nucleotide sequence of its structural gene in three breeds

Fibroblast growth factor 4 (FGF4) is considered a crucial gene in the proper development of bovine embryos. We recently determined the FGF4 gene sequence in eight cattle derived from three breeds and revealed a common nucleotide sequence of the structural gene encoding FGF4, which leads to the deletion and mutation of amino acid sequences in the mature FGF4 (Pro³²‐Leu²⁰⁶) compared with the sequence previously reported. In the present study, HisbFGF4, a 6× histidine‐tagged bovine FGF4 (Pro³²‐Leu²⁰⁶), was produced in Escherichia coli based on the validated nucleotide sequence and purified by heparin column chromatography. In primary bovine fibroblasts, HisbFGF4 showed significant mitogenic activity, whereas, intriguingly, the activity of a commercially available recombinant human FGF4 (Gly²⁵‐Leu²⁰⁶) produced in E. coli was weaker than that of HisbFGF4. In conclusion, the present study provides a simple method for the production of a bioactive bovine FGF4 derivative in E. coli utilizing its structural gene elucidated by us.     

H5N1亚型禽流感病毒神经氨酸酶基因的表达及纯化

用RT-PCR方法从H5N1亚型禽流感病毒（AIV）A／Duck／Zhejiang／12／00中获得NA基因，将目的基因定向克隆到原核表达载体pET-32a中，将序列测定和双酶切验证准确的阳性重组质粒转化大肠杆菌BL21，用IPTG诱导，经SDS-PAGE和Western-blot分析，结果显示，重组蛋白得到了可溶性表达，表达的蛋白质分子质量为33ku；该蛋白可以与禽流感H5N1亚型阳性血清反应，具有良好的免疫原性；ELISA检测结果表明，用此纯化蛋白作为包被抗原检测H5N1亚型AIV神经氨酸酶抗体具有良好的灵敏性。     

牛病毒性腹泻病毒E2蛋白的截短表达与鉴定

利用牛病毒性腹泻病毒（BVDV）BA株接种MDBK细胞，提取病毒RNA。参照已发表的BVDV基因组序列，利用Oligo6生物学软件设计扩增E2基因的1对引物，引入酶切位点并去掉E2蛋白的跨膜区及疏水区。通过RT-PCR扩增了长约1000bp的E2基因片段，克隆到pMD18-T载体上，酶切并测序鉴定。然后将目的片段进一步定向克隆到pET30a表达载体，转化BL21表达菌。取转化菌培养，并用IPTG诱导，获得了以包涵体形式表达的重组蛋白。将重组蛋白变性、纯化和复性后，用免疫印迹与间接ELISA检测表明纯化的重组蛋白具有良好的免疫原性，为牛病毒性腹泻病毒诊断试剂的研制奠定了基础。     

Differentiation of canine bone marrow stromal cells into voltage- and glutamate-responsive neuron-like cells by basic fibroblast growth factor

We investigated the in vitro differentiation of canine bone marrow stromal cells (BMSCs) into voltage- and glutamate-responsive neuron-like cells. BMSCs were obtained from the bone marrow of healthy beagle dogs. Canine BMSCs were incubated with the basal medium for neurons containing recombinant human basic fibroblast growth factor (bFGF; 100 ng/ml). The viability of the bFGF-treated cells was assessed by a trypan blue exclusion assay, and the morphology was monitored. Real-time RT-PCR was performed to evaluate mRNA expression of neuronal, neural stem cell and glial markers. Western blotting and immunocytochemical analysis for the neuronal markers were performed to evaluate the protein expression and localization. The Ca²⁺ mobilization of the cells was evaluated using the Ca²⁺ indicator Fluo3 to monitor Ca²⁺ influx. To investigate the mechanism of bFGF-induced neuronal differentiation, the fibroblast growth factor receptor inhibitor, the phosphoinositide 3-kinase inhibitor or the Akt inhibitor was tested. The bFGF treatment resulted in the maintenance of the viability of canine BMSCs for 10 days, in the expression of neuronal marker mRNAs and proteins and in the manifestation of neuron-like morphology. Furthermore, in the bFGF-treated BMSCs, a high concentration of KCl and L-glutamate induced an increase in intracellular Ca²⁺ levels. Each inhibitor significantly attenuated the bFGF-induced increase in neuronal marker mRNA expression. These results suggest that bFGF contributes to the differentiation of canine BMSCs into voltage- and glutamate-responsive neuron-like cells and may lead to the development of new cell-based treatments for neuronal diseases.     

牛传染性鼻气管炎病毒gD蛋白的截短表达与活性检测

经生物学软件DNAStar分析,以牛传染性鼻气管炎病毒(Banha Nu/67)基因组DNA为模板,PCR扩增gD基因943bp的片段,将目的片段定向克隆到pET30a表达载体中,酶切及测序鉴定均正确后,转化BL21表达菌,经IPTG诱导得到部分可溶表达的重组蛋白。用Ni柱亲和层析法在非变性的条件下纯化重组蛋白,纯化的重组蛋白浓度为0.852mg/mL,纯度为85.2%。Westem blot、间接ELISA检测证明纯化的重组蛋白具有良好的抗原性和特异性。     

牛分枝杆菌Ag85A基因在大肠埃希氏菌中的表达

以BamHⅠ和EcoRⅠ双酶切已构建的pGEM-T-85A和pET28a（＋），并将纯化的Ag85A基因亚克隆至pET28a（＋）中，构建出原核表达质粒pET28a-85A。将pET28a-85A转化至感受态E．coli BL21（DE3）中，经IPTG诱导和SDS-PAGE分析，可见约32ku的外源蛋白带。Western-blotting分析表明，该蛋白具有牛分枝杆菌的抗原性。     

Basic fibroblast growth factor stimulates epithelial cell growth and epithelial wound healing in canine corneas

Objective  To evaluate the effect of basic fibroblast growth factor (bFGF) on the proliferation of canine corneal epithelial cells and epithelial wound healing.
Animal studied  Canine corneal epithelial cells from the corneas of euthanized dogs and corneal epithelial wounds on one eye from each of 24 dogs.
Procedures  The proliferation of corneal epithelial cells in vitro was measured using the methylthiazolyl-tetrazolium (MTT) assay. A corneal wound on one eye of each dog was made with a corneal trephine (6 mm diameter). Four concentrations of bFGF, 0, 100, 500, and 1000 ng/mL, were applied to the affected eyes of dogs, t.i.d. Fluorescein staining was used to assess closure of the corneal epithelial wound.
Results  The addition of bFGF resulted in a significant increase in epithelial proliferation at 24 h after culture, except 1 ng/mL bFGF. Cells with all bFGF treatments proliferated significantly at 48 and 96 h compared to those in the non-bFGF group. bFGF at a concentration of 10 ng/mL promoted cell proliferation maximally. The wound healing rate in the bFGF-treated groups was greater than that in the control. All corneal wounds in bFGF-treated corneas closed by day 7, whereas two of six corneal wounds in the control showed poor healing. None of the eyes developed corneal clouding or neovascularization during the experiment.
Conclusions  Basic fibroblast growth factor accelerated the proliferation of canine epithelial cells and effectively promoted corneal epithelial wound healing.     

Expression of fibroblast growth factor 21 in the liver of dairy cows in the transition period and during lactation

Fibroblast growth factor 21 (FGF21) has been identified as a novel hormonal factor involved in the regulation of metabolic adaptations during energy deprivation. The present study aimed to investigate the expression of the FGF21 gene in the liver of dairy cows during the transition from pregnancy to lactation. Therefore, the relative mRNA abundance of FGF21 in liver biopsy samples of 20 dairy cows in late pregnancy (3 weeks pre‐partum) and early lactation (1, 5, 14 weeks post‐partum) was determined. It was observed that hepatic mRNA abundance of FGF21 at 1 week post‐partum was dramatically increased (110‐fold) compared to 3 weeks pre‐partum (p < 0.001). With progress of lactation, mRNA concentration of FGF21 was declining; nevertheless, mRNA abundance at 5 and 14 weeks post‐partum remained 25‐ and 10‐fold increased compared to 3 weeks pre‐partum (p < 0.001). Using a gene array technique, it was found that many genes involved in fatty acid oxidation, gluconeogenesis and ketogenesis were up‐regulated during early lactation compared to late pregnancy. Moreover, there were positive linear correlations between hepatic mRNA concentration of FGF21 and mRNA concentrations of genes involved in ketogenesis as well as carnitine synthesis and carnitine uptake at various time‐points during lactation, indicating that FGF21 could play a role in ketogenesis and carnitine metabolism in the liver of dairy cows (p < 0.05). In overall, the present study shows that expression of the FGF21 gene is strongly up‐regulated during the transition period. It is assumed that the up‐regulation of FGF21 might play an important role in the adaptation of liver metabolism during early lactation in dairy cows such as in other species.