TGF-beta1 phage model peptides isolated from a phage display 7-mer peptide library can inhibit the activity of keloid fibroblasts

Background Transforming growth factor-beta1 (TGF-beta1) is known to have a role in keloid formation through the activation of fibroblasts and the acceleration of collagen deposition. The objective of this current study was to isolate TGF-beta1 phage model peptides from a phage display 7-mer peptide library to evaluate their therapeutic effect on inhibiting the activity of keloid fibroblasts. Methods A phage display 7-mer peptide library was screened using monoclonal anti-human TGF-beta1 as the target to obtain specific phages containing ectogenous model peptides similar to TGF-beta1. Enzyme-linked immunosorbent assay (ELISA) was performed to select monoclonal phages with good binding activity, which underwent DNA sequencing. MTT assay and apoptosis assessment were used to evaluate the biological effects of the phage model peptides on keloid fibroblasts. Immunofluorescence assay was employed to show the binding affinity of the model peptides on phages causing keloid fibroblasts. Quantitative real-time PCR analysis was carried out to detect the expressions of Nuclear factor kappa B (NF-kappa B) mRNA, connective tissue growth factor (CTGF) mRNA and TGF-beta receptor II (TβRII) mRNA in keloid fibroblasts. Results Specific phages with good results of ELISA were beneficiated. Four phage model peptides were obtained. The data of MTT showed that TGF-beta1 and one phage model peptide (No.4) could promote keloid fibroblasts proliferation, however, three phage model peptides (No.1-3) could inhibit keloid fibroblasts proliferation. The results of apoptosis assessment showed that the three phage model peptides could slightly induce the apoptosis in keloid fibroblasts. The data of immunofluorescence assay revealed that the model peptides on phages rather than phages could bind to keloid fibroblasts. The findings of quantitative real-time PCR analysis suggested that the expressions of NF-Kappa B mRNA and CTGF mRNA in the three phage model peptides groups decreased, while the expression of TβRII mRNA slightly increased. Conclusions Three phage model peptides isolated from a phage display 7-mer peptide library can inhibit keloid fibroblasts proliferation and induce the apoptosis in keloid fibroblasts. They can inhibit the activity of keloid fibroblasts by blocking TGF-beta1 binding to its receptor and then regulating the expressions of NF-kappa B, CTGF and TβRII.     

Screening and Identification of a Novel Hepatocellular Carcinoma Cell Binding Peptide by Using a Phage Display Library

The purpose of this study was to screen peptides that can specifically bind to human hepatocellular carcinoma(hHCC) cells using phage display of random peptide library in order to de-velope a peptide-based carrier for the diagnosis or therapy of hHCC.A peptide 12-mer phage display library was employed and 4 rounds of subtractive panning were performed using the hHCC cell line HepG2 as the target.After panning,the phages that specifically bound to and internalized in hHCC cells were selected.The selected phages demonstrated highly specific affinity to HepG2 cells analyzed by ELISA and immunofluorescence analysis.57.3% of the selected phage clones displayed repeated sequence FLLEPHLMDTSM,and 4 amino acid residues,FLEP were extremely conservative.Based on the sequencing results,a 16-mer peptide(WH-16) was synthesized.The competitive ELISA showed that the binding of the phage clones displayed sequence FLLEPHLMDTSM to HepG2 cells was efficiently inhibited by WH-16.Our findings indicate that cellular binding of phage is mediated via its displayed peptide and the synthesized 16-mer peptide may have the potential to be a delivery carrier in target diagnosis or therapy for hHCC.     

Transforming growth factor-β1 phage model peptides isolated from a phage display 7-mer peptide library can inhibit

Background  Transforming growth factor-β1 (TGF-β1) is known to have a role in keloid formation through the activation of fibroblasts and the acceleration of collagen deposition. The objective of this current study was to isolate TGF-β1 phage model peptides from a phage display 7-mer peptide library to evaluate their therapeutic effect on inhibiting the activity of keloid fibroblasts.

Methods  A phage display 7-mer peptide library was screened using monoclonal anti-human TGF-β1 as the target to obtain specific phages containing ectogenous model peptides similar to TGF-β1. Enzyme-linked immunosorbent assay (ELISA) was performed to select monoclonal phages with good binding activity, which underwent DNA sequencing. MTT assay and apoptosis assessment were used to evaluate the biological effects of the phage model peptides on keloid fibroblasts. Immunofluorescence assay was employed to show the binding affinity of the model peptides on phages causing keloid fibroblasts. Quantitative real-time PCR analysis was carried out to detect the expressions of nuclear factor κB (NF-κB) mRNA, connective tissue growth factor (CTGF) mRNA and TGF-β receptor II (TβRII) mRNA in keloid fibroblasts.

Results  Specific phages with good results of ELISA were beneficiated. Four phage model peptides were obtained. The data of MTT showed that TGF-β1 and one phage model peptide (No. 4) could promote keloid fibroblasts proliferation, however, three phage model peptides (No. 1–3) could inhibit keloid fibroblasts proliferation. The results of apoptosis assessment showed that the three phage model peptides could slightly induce the apoptosis in keloid fibroblasts. The data of immunofluorescence assay revealed that the model peptides on phages rather than phages could bind to keloid fibroblasts. The findings of quantitative real-time PCR analysis suggested that the expressions of NF-κB mRNA and CTGF mRNA in the three phage model peptide groups decreased, while the expression of TβRII mRNA slightly increased.

Conclusions  Three phage model peptides isolated from a phage display 7-mer peptide library can inhibit keloid fibroblasts proliferation and induce the apoptosis in keloid fibroblasts. They can inhibit the activity of keloid fibroblasts by blocking TGF-β1 binding to its receptor and then regulating the expressions of NF-κB, CTGF and TβRII.

     

Keratinocyte growth factor phage model peptides can promote epidermal cell proliferation without tumorigenic effect

Background Keratinocyte growth factor （KGF） significantly influences epithelial wound healing. The aim of this study was to isolate KGF phage model peptides from a phage display 7-mer peptide library to evaluate their effect on promoting epidermal cell proliferation. Methods A phage display 7-mer peptide library was screened using monoclonal anti-human KGF antibody as the target. Enzyme linked immunosorbent assay （ELISA） was performed to select monoclonal phages with good binding activity. DNA sequencing was done to find the similarities of model peptides. Three-（4,5-dimethylthiazol-2-yl） -2,5-diphenyl tetrazolium bromide （MTT） assay, immunofluorescence assay and quantitative real-time PCR analysis were employed to evaluate the effect of the phage model peptides on epidermal cells. Results Thirty-three out of fifty-eight （56.9%） of the isolated monoclonal phages exhibited high binding activity by ELISA. Ten of fifteen obtained phage model peptides were similar to KGF or epidermal growth factor （EGF）. MTT assay data showed that four （No. 1-4） of the ten phage model peptides could promote epidermal cell proliferation. The expression of keratinocyte growth factor receptor （KGFR） mRNA in the KGF control group and the two phage model peptide groups （No. 1 and No. 2） increased. Expression of c-Fos mRNA and c-Jun mRNA in the KGF control group increased, but did not increase in the four phage model peptide groups （No.1-4）. Conclusion Four phage model peptides isolated from the phage display 7-mer peptide library can safely promote epidermal cell proliferation without tumorigenic effect.     

A resistin binding peptide selected by phage display nhibits 3T3-L1 preadipocyte differentiation

Background Resistin, a newly discovered cysteine-rich hormone secreted mainly by adipose tissues, has been proposed to form a biochemical link between obesity and type 2 diabetes. However, the resistin receptor has not yet been identified. This study aimed to identify resistin binding proteins/receptor.Methods Three cDNA fragments with the same 11 bp 5’ sequence were found by screening a cDNA phage display library of rat multiple tissues. As the reading frames of the same 11 bp 5’ sequence were interrupted by a TGA stop codon, plaque lift assay was consequently used to prove the readthrough phenomenon. The stop codon in the same 11 bp 5’ sequence was replaced by tryptophan, and the binding activity of the coded peptide [AWIL, which was designated as resistin binding peptide (RBP)] with resistin was identified by the confocal microscopy technique and the affinity chromatography experiment. pDual GC-resistin and pDual GC-resistin binding peptide were co-transfected into 3T3-L1 cells to confirm the function of resistin binding peptide.Results Three cDNA fragments with the same 11 bp 5’ sequence were found. The TGA stop codon in reading frames of the same 11 bp 5’ sequence was proved to be readthroughed. The binding activity of RBP with resistin was consequently identified. The expression of the resistin binding peptide in 3T3-L1 preadipocytes expressing pDual GC-resistin significantly inhibited the adipogenic differentiation.Conclusion RBP could effectively rescue the promoted differentiation of resistin overxepressed 3T3-L1 preadipocyte.     

Ribotrap Analysis of Proteins Associated with FHL3 3’Untranslated Region in Glioma Cells

Objective To screen the proteins associated with four-and-a-half LIM domains 3（FHL3） 3＇ untranslated region（3＇UTR） in glioma cells. Methods Western blot was adopted to detect the regulatory effect of poly（C）-binding protein 2（PCBP2） on FHL3. Biotin pull-down and sliver staining were employed to screen and verify the candidate binding proteins of FHL3 3＇UTR. Then liquid chromatography-tandem mass spectrometry（LC-MS/MS） and molecule annotation system were used to identify and analyze the candidate binding proteins. Immunoprecipitation was conducted to study the interaction between PCBP2 and polypyrimidine tract-binding protein 1（PTBP1）, a binding protein identified by LC-MS/MS. Results PCBP2 could bind to FHL3 mRNA 3＇UTR-A and inhibited the expression of FHL3 in T98 G glioms cells. 22 candidate binding proteins were identified. Among them, there were 11 RNA binding proteins, including PCBP2. PTBP1 associated with FHL3 mRNA 3＇UTR and interacted with PCBP2 protein. Conclusion PCBP2 and PTBP1 can both associate with FHL3 mRNA 3＇UTR through forming a protein complex.     

A resistin binding peptide selected by phage display inhibits 3T3-L1 preadipocyte differentiation

Background Resistin, a newly discovered cysteine-rich hormone secreted mainly by adipose tissues, has been proposed to form a biochemical link between obesity and type 2 diabetes. However, the resistin receptor has not yet been identified. This study aimed to identify resistin binding proteins/receptor. Methods Three cDNA fragments with the same 11 bp 5＇ sequence were found by screening a cDNA phage display library of rat multiple tissues. As the reading frames of the same 11 bp 5＇ sequence were interrupted by a TGA stop codon, plaque lift assay was consequently used to prove the readthrough phenomenon. The stop codon in the same 11 bp 5＇ sequence was replaced by tryptophan, and the binding activity of the coded peptide [AWIL, which was designated as resistin binding peptide （RBP）] with resistin was identified by the confocal microscopy technique and the affinity chromatography experiment, pDual GC-resistin and pDual GC-resistin binding peptide were co-transfected into 3T3-L1 cells to confirm the function of resistin binding peptide. Results Three cDNA fragments with the same 11 bp 5＇ sequence were found. The TGA stop codon in reading frames of the same 11 bp 5＇ sequence was proved to be readthroughed. The binding activity of RBP with resistin was consequently identified. The expression of the resistin binding peptide in 3T3-L1 preadipocytes expressing pDual G-C-resistin significantly inhibited the adipogenic differentiation. Conclusion RBP could effectively rescue the promoted differentiation of resistin overxepressed 3T3-L1 preadipocyte.     

Recombinant Vaccinia Virus is an Effective and Non—perturbing Vector for Human Dendritic Cells Transfected with Epstein—Barr Virus Latent Membrane Protein 2A

Objective To study the effects of dendritic cells(DC) transfected with recombinant vaccinia virus encoding Epstein-Barr virus(EBV) latent membrane protein 2A(LMP2A) gene,and to provide evidence for further investigation on the therapeutic uaccines against EBV-associated malignancies.Methods Mature DC were transfected with EVB-LMP2A recombinant vaccinia virus(rVV-LMP2A).Before and after the transfection,the expression of surface antigens on mature DC including CD1a,CD83,CD40,CD80,HLA-DR was measured by fluorescence activated cell sorter(FACS) and the function of DC to stimulate allogeneic T cells proliferation was measured by mixed leukocyte reactions(MLR).Results LMP2A protein was highly expressed (66.1%) in DC after the transfection of rVV-LMP2A.No significant changes in the primary surface antigens expression and in the MLR were detected during the transfection.Transfected DC still had strong potential in stimulating the proliferation of allogeneic T cells.Conclusion Recombinant vaccinia virus was an effective and non-perturbing vector to mediate the transfection of LMP2A into DC.The functions of mature DC were not affected significantly by the transfection of Vac-LMP2A.This study could provide evidence for the further immunotherapy of EBV-associated malignancies,e.g.nasopharyngeal carcinoma(NPC).     

Evaluation of characteristics on titanium surface treatment for absorption of functional groups

Background In order to bind or fix bioactive materials directly to the surface of a Ti implant, the prior binding process of functional groups （FGs, -COOH and -OH） to the implant surface is necessary. Conventional binding processes are so high-cost and complex, so it is essential to find a simple and effective procedure for Ti-FG binding.Methods Various electrolyte compositions and electrochemical processing were adopted in this study to develop a relatively simple and effective Ti-FG binding process. The ability of Ti-FG binding and calcium （Ca）/phosphorous （P）absorption and corrosion resistance were evaluated according to various titanium surface treatment in electrolyte involving -COOH and -OH ion by using X ray photoelectron spectroscopy （XPS）, field emission scanning electron microscope （FE-SEM） and potentiodynamic scan method respectively.Results In cases of -COOH, the anodic oxidation process （AN） showed an effective binding ability between -COOH and Ti surface. On the other hand, in cases of -OH, there were no significant differences in the result between the conditions used. In regard to the absorption of Ca and P on Ti surface, there was a minimal amount of Ca absorbed but no P was absorbed. The anodic oxidation series showed homogenous corrosion, whereas the electrolyte immersion （EL）series showed unstable corrosion. Although EL-OH showed a novel corrosion potential, the EL-COOH series showed good corrosion resistance over the anodic potential range.Conclusions The ability of binding between FG and the Ti surface and Ca/P absorption were strongly associated with the surface potential （ξ, potential）, which was dependent on the pH of the electrolyte. Accordingly, in order to achieve the effective absorption of various FGs on the Ti surface, it is needed to develop the combination process in addition to the electric affinity, relation with the ξ, potential.     

Screening of TACE Peptide Inhibitors from Phage Display Peptide Library

Summary： To obtain the recombinant tumor necrosis factor-α converting enzyme （TACE） ectodomain and use it as a selective molecule for the screening of TACE peptide inhibitors, the cDNA coding catalytic domain （TS00） and full-length ectodomain （T1300） of TACE were amplified by RT-PCR, and the expres.sion plasmids were constructed by inserting T800 and T1300 into plasmid pET-28a and pET-28c respectively. The recombinant TS00 and T1300 were induced by IPTG, and SDS-PAGE and Western blotting analysis results revealed that TS00 and T1300 were highly expressed in the form of inclusion body. After Ni^2＋-NTA resin affinity chromatography, the recombinant proreins were used in the screening of TACE-binding peptides from phage display peptide library respectively. After 4 rounds of biopanning, the positive phage clones were analyzed by ELISA, competitive inhibition assay and DNA sequencing. A common amino acid sequence （TRWLVYFSRPYLVAT） was found and synthesized. The synthetic peptide could inhibit the TNF-α release from LPS-stimulated human peripheral blood mononuclear cells （PBMC） up to 60.3%. FACS analysis revealed that the peptide mediated the accumulation of TNF-α on the cell surface. These results demonstrate that the TACE binding peptide is an effective antagonist of TACE.     

人骨形态形成蛋白的纯化及其诱导成骨的研究

本实验采用差示沉积、超滤及羟基磷灰石柱层析法,提取和纯化了人骨基质内骨形态形成蛋白,得到纯化的人骨形态形成蛋白,分子量为17000U(约17000道尔顿).以C_3H小鼠147只为实验动物,纯化的骨形态形成蛋白的诱导成骨率为100％。     

人重组骨形态发生蛋白Ⅲ在大肠杆菌中的表达及活性测定

本文报道了利用基因工程技术在大肠杆菌中表达人重组骨形态发生蛋白Ⅲ。运用ＰＣＲ技术，从质粒ｐＳＰ６４／ｈＢＭＰ３中扩增出约０．３３ｋｂ的ｈＢＭＰ３ｃＤＮＡ片断，然后亚克隆到表达质粒ｐＭＳ３１ｂ申，在大肠杆菌一成功地高效表达出人ＢＭＰ３融合蛋白，表达产物具有体内诱导异位化骨的趋势。     

CO-TRANSFECTION OF RAT BONE MARROW MESENCHYMAL STEM CELLS WITH HUMAN BMP2 AND VEGF165 GENES

Objective To explore the feasibility and efficacy of lentivirus-mediated co-transfection of rat bone marrow mesenchymal stem cells (MSCs) with human vascular endothelial growth factor 165 (hVEGF165) gene and human bone morphogenetic protein 2 (hBMP2) gene. Methods The hVEGF165 and hBMP2 cDNAs were obtained from human osteosarcoma cell line MG63 and cloned into lentiviral expression vectors designed to co-express the copepod green fluorescent protein (copGFP). The expression lentivector and packaging Plasmid Mix were co-transferred to 293TN cells, which produced the lentivirus carrying hVEGF165 (Lv-VEGF) or hBMP2 (Lv-BMP), respectively. MSCs of Wistar rats were co-transfected with Lv-BMP and Lv-VEGF (BMP+VEGF group), or each alone (BMP group and VEGF group), or with no virus (Control group). The mRNA and protein expressions of hVEGF165 and hBMP2 genes in each group were detected by real-time PCR and enzyme linked immunosorbent assay (ELISA). Results Lentiviral expression vectors carrying hVEGF165 or hBMP2 were correctly constructed and confirmed by restriction endonucleses analysis and DNA sequencing analysis. A transfer efficiency up to 90% was archieved in all the transfected groups detected by the fraction of fluorescent cells using fluorescent microscopy. From the results generated by real-time PCR and ELISA, VEGF165 and BMP2 genes were co-expressed in BMP+VEGF group. No significant difference of BMP2 expression was detected between BMP+VEGF and BMP groups (P>0.05). Similarly, there was no significant difference of VEGF165 expression between BMP+VEGF and VEGF groups (P>0.05). Conclusion VEGF165 and BMP2 genes were successfully co-expressed in MSCs by lentivirus-mediated co-transfection, which provided a further foundation for the combined gene therapy of bone regeneration.     

Osteogenic potential of the human bone morphogenetic protein 2 gene activated nanobone putty

Background Nanobone putty is an injectable and bioresorbable bone substitute. The neutral-pH putty resembles hard bone tissue, does not contain polymers or plasticizers, and is self-setting and nearly isothermic, properties which are helpful for the adhesion, proliferation, and function of bone cells. The aim of this study was to investigate the osteogenic potential of human bone morphogenetic protein 2 （hBMP2） gene activated nanobone putty in inducing ectopic bone formation, and the effects of the hBMP2 gene activated nanobone putty on repairing bone defects.
Methods Twenty four Kunming mice were randomly divided into two groups. The nanobone putty ＋ hBMP2 plasmid was injected into the right thigh muscle pouches of the mice （experiment side）. The nanobone putty ＋ blank plasmid or nanobone putty was injected into the left thigh muscle pouches of the group 1 （control side 1） or group 2 （control side 2）, respectively. The effects of ectopic bone formation were evaluated by radiography, histology, and molecular biology analysis at 2 and 4 weeks after operation. Bilateral 15 mm radial defects were made in forty-eight rabbits. These rabbits were randomly divided into three groups： Group A, nanobone putty ＋ hBMP2 plasmid; Group B, putty ＋ blank plasmid; Group C, nanobone putty only. Six rabbits with left radial defects served as blank controls. The effect of bone repairing was evaluated by radiography, histology, molecular biology, and biomechanical analysis at 4, 8, and 12 weeks after operation.
Results The tissue from the experimental side of the mice expressed hBMP2. Obvious cartilage and island-distributed immature bone formation in implants of the experiment side were observed at 2 weeks after operation, and massive mature bone observed at 4 weeks. No bone formation was observed in the control side of the mice. The ALP activity in the experiment side of the mice was higher than that in the control side. The tissue of Group A rabbits expressed hBMP2 protein and higher ALP level. The ne     

葡萄糖酸锌碳点在细胞成像和体外促进成骨分化中的作用

目的：通过一步水热法合成葡萄糖酸锌碳点（Zn-CDs）,探讨Zn-CDs的细胞成像及其对小鼠前成骨细胞向成骨方向分化的促进作用。方法：一步水热法合成Zn-CDs,采用透射电子显微镜（TEM）、荧光光谱仪和傅里叶变换红外光谱仪（FT-IR）观察检测Zn-CDs的表征。将不同浓度（0.01、0.10、1.00、10.00、100.00和1 000.00 mg· L^-1） Zn-CDs浸提液与小鼠前成骨细胞系MC3T3-E1共培养作为实验组,空白对照组仅加入细胞培养液。采用MTT法检测各组MC3T-E1细胞相对增殖率（RGR）;采用激光共聚焦成像观察MC3T3-E1细胞的成像特点;采用qRT-PCR法检测各组MC3T3-E1细胞中Runt相关转录因子2基因（Runx2）、碱性磷酸酶基因（ALP）和骨钙素（OC） mRNA相对表达水平;茜素红染色检测各组细胞中钙化结节数。结果：TEM检测,成功合成粒径为5.25 nm的Zn-CDs。荧光光谱,Zn-CDs具有360 nm紫外光激发和450 nm蓝光发射的荧光性质,并表现激发波长依赖特性。FT-IR检测,Zn-CDs表面主要由羧基和羟基基团构成。与空白对照组比较,共培养24 h时1 000.00 mg·L^-1Zn-CDs组MC3T3-E1细胞的RGR明显降低（P<0.01）。荧光成像,Zn-CDs与MC3T3-E1细胞共培养后,细胞呈现蓝色、绿色和红色的荧光图像,形态轮廓清楚且荧光强度细胞质比细胞核强。qRT-PCR检测,随着Zn-CDs浓度的增加,MC3T3-E1细胞中Runx2、ALP和OCmRNA相对表达水平逐渐升高。茜素红染色,诱导21 d后不同浓度Zn-CDs组MC3T3-E1细胞中钙结节数多于空白对照组。结论：Zn-CDs可以有效地进行MC3T3-E1细胞荧光成像,且Zn-CDs具有一定的促MC3T3-E1细胞向成骨方向分化的作用。     

含EGFP的人BMP2表达载体在人皮肤成纤维细胞中的表达

目的构建带加强型绿色荧光蛋白(EGFP)基因的人骨形成蛋白2(hBMP2)真核表达载体，观察其在正常人皮肤成纤维细胞中的表达情况。方法构建携带hBMP2和EGFP基因的真核表达载体pcDNA3-hBMP2-IRES-ECFP(pcBE)，将其转染NIH3T3细胞和正常人皮肤成纤维细胞后，采用RT—PCR和免疫组化染色方法分别检测人BMP2和EGFP基因在mRNA和蛋白质水平上的表达情况。结果转染后的NIH3T3和正常人皮肤成纤维细胞均能转录人BMP2 mRNA和表达人BMP2蛋白，同时显示绿色荧光。结论pcBE真核表达载体可在正常人皮肤成纤维细胞内有效表达人BMP2蛋白，并以其荧光报告基因起示踪作用。     

人骨形态发生蛋白12前体蛋白cDNA的克隆及序列分析

目的 克隆人骨形态发生蛋白12前体蛋白的基因。方法 根据Genbank人骨形态发生蛋白12的基因序列合成两条引物，从人胎盘组织中提取总RNA，用反转录聚合酶链反应(RT-PCR)技术扩增出长920bp编码人骨形态发生蛋白12(BMP12)前体蛋白的基因序列。将所得的基因片段插人载体pTARCET^TM质粒中并转化大肠杆菌JM109，提取重组质粒进行鉴定并测序。结果 RT-PCR产物琼脂糖凝胶电泳显示一长约920bp的条带．阳性克隆质粒经PCR扩增出约920bp的片段，全自动DNA测序结果表明和Genbank中的序列完全相符。结论 通过RT-PCR可从人胎盘组织中成功地克隆出人pMP12前体蛋白基因，基因序列完全正确。     

人源抗HBsAg噬菌体抗体的筛选及其重链基因结构分析

筛选出结合乙型肝炎病毒表面抗原的人噬菌体抗体并对其重链和轻链基因序列进行分析。方法：应用噬菌体抗体库技术筛选出人源抗ＨＢｓＡｇ噬菌体抗体，并用ＥＬＩＳＡ及竞争抑制试验测定其活性及特异性，利用全自动测序仪测定其重链基因序列。     

hBMP9在人骨肉瘤细胞株MG63、U2OS和143B中的内源性表达

目的:研究人骨形态发生蛋白(Human bone morphogenetie protein,hBMP)9在人骨肉瘤细胞株MG63、U2OS和143B中的内源性表达,为下一步研究hBMP9对骨肉瘤的体内外作用奠定实验基础.方法:利用免疫细胞化学法和Western blot法检测hBMP9在人骨肉瘤细胞株MG63、U2OS和143B中的内源性表达.结果:在MG63、U2OS和143B中,hBMP9均呈不同程度的阳性表达,并且两种检测方法所得结果一致.结论:hBMP9在人骨肉瘤细胞株MG63、U2OS和143B中均有内源性表达.