鸡TGF‑β1原核表达及多克隆抗体的制备

Prokaryotic expression of chicken TGF‑β1 and preparation of polyclonal antibody

  • 摘要: 旨在制备鸡转化生长因子β1(Transforming growth factor β1, TGF‑β1)的多克隆抗体。首先,以马立克病病毒转化的T淋巴细胞系MSB1细胞的mRNA为模板,通过RT‑PCR技术扩增鸡TGF‑β1基因的完整CDS区,将其连接至原核表达载体pET‑32a(+)中,构建重组表达质粒pET‑32a‑TGF‑β1;随后,将重组质粒转化至大肠杆菌表达菌株BL21中进行诱导表达,采用亲和层析法对表达蛋白进行纯化;接着,利用免疫家兔制备多克隆抗体,并通过间接ELISA检测抗体效价,通过Western blot技术和间接免疫荧光检测来评价多克隆抗体的特异性。结果表明,重组原核表达质粒pET‑32a‑TGF‑β1构建成功,经IPTG诱导后获得约65 kDa的重组蛋白;免疫家兔获得TGF-β1抗血清,ELISA检测显示抗体效价达1∶640 000;Western blot结果证实,该抗血清能特异性识别目的蛋白;间接免疫荧光结果显示,该多克隆抗体能很好地识别TGF‑β1阳性细胞。综上,本研究制备出的兔抗鸡TGF‑β1多克隆抗体,可用于鸡TGF‑β1的检测。

     

    Abstract: The polyclonal antibodies against chicken transforming growth factor β1 (TGF‑β1) was prepared. Firstly, the CDS region of the chickenTGF‑β1 gene was amplified by RT‑PCR using the mRNA of Marek's disease virus transformed T lymphocyte line MSB1 cell as the template, and then the fragment was ligated into the prokaryotic expression vector pET‑32a (+) for the construction of the recombinant plasmid pET‑32a‑TGF‑β1. Subsequently, the recombinant expression plasmid was transformed into the Escherichia coli expression strain BL21 and induced for expression. The recombinant expressed protein was purified by affinity chromatography. Then, polyclonal antibodies were prepared by immunizing rabbits, and the antibody titer was detected by indirect ELISA. The specificity of the polyclonal antibodies was evaluated by Western blot and indirect immunofluorescence. The results demonstrated that the successful construction of the recombinant prokaryotic expression plasmid pET‑32a‑TGF‑β1, and a recombinant protein of approximately 65 kDa was obtained after induction with IPTG. Rabbit anti-chicken TGF‑β1 antiserum was obtained by immunizing rabbits, and the antibody titer was 1∶640 000 as detected by ELISA. Western blot results showed that the rabbit anti‑chicken TGF‑β1 antiserum could specifically recognize the target protein, and indirect immunofluorescence results indicated that the polyclonal antibody could well recognize TGF‑β1 positive cells. In conclusion, polyclonal antibodies against chicken TGF‑β1 with good specificity were successfully prepared, and can be used for the detection of chicken TGF‑β1.

     

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