huFcγRII线性结合表位的鉴定及对SLE小鼠的治疗效果
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摘要
为获得huFcγRII胞外区蛋白,将huFcγRII胞外区cDNA亚克隆到原核表达载体pET-28a,结果在大肠杆菌中高效表达了huFcγRII胞外区,以快速稀释复性方法从包涵体变性蛋白中回收了具有良好结合活性的huFcγRII重组蛋白。为研究huFcγRII的功能,将huFcγRII编码区cDNA亚克隆到真核表达载体pcDNA3,转染COS-7细胞,在细胞表面表达该受体分子,通过G418抗性筛选和连续克隆化,结果获得了稳定表达huFcγRII的转染细胞株。
     为鉴定huFcγRII的线性结合表位,在EC2结构域设计合成huFcγRII多肽,偶联于载体蛋白BSA;以Dot-blot检测偶联多肽与人IgG的结合,并对阳性多肽进行进一步缺失分析。Dot-blot分析表明huFcγRII的151-163位多肽CTGNIGYTLFSSK是特异结合人IgG的有效多肽,为huFcγRII的线性结合表位,位于受体EC2结构域F-G环。含有huFcγRII线性结合表位的多肽不仅有效抑制人IgG与可溶性huFcγRII的结合,而且对huFcγRII转染细胞表面的IgG-FITC免疫荧光强度也具有良好的抑制功效,表明该结合表位多肽具有调节人IgG与细胞表面huFcγRII结合的能力,是首次发现的人FcR上存在线性结合表位。
     为验证huFcγRII线性结合表位在体内的功能,将该多肽进行了动物实验。SLE小鼠模型实验表明该表位多肽提高了小鼠存活率,降低了严重蛋白尿比例和肾脏损伤程度,说明huFcγRII多肽对SLE模型小鼠的病情具有一定的延缓作用,对开发治疗自身免疫疾病的FcR靶标药物提供了参考。
Fc receptors are a group of important molecules expressed on the surface of immune accessory and effector cells, which bind the Fc region of immunoglobulins with specific affinities and have a number of important biological functions. FcRs play a crucial role in immune regulation by providing a link between the humoral and cellular responses. The antibody-mediated inflammatory response is regulated by activating and inhibitory FcRs. Thus, FcR-targeting provides therapies for allergy and autoimmune diseases. In this study using synthetic peptides we identified and characterized a linear epitope sequence in huFcγRII involved in the binding of human IgG. This is the first report describing linear epitopes on human FcRs capable of Fc-binding. This should further our understanding of the molecular mechanism of the FcγR-IgG interaction, and may provide a basis for the design of drugs with a potential for regulating antibody-mediated inflammation.
     HuFcγRII is a low-affinity Fc receptor with two extracellular Ig-like domains and binds human IgG via the membrane proximal extracellular domain 2(EC2). To obtain a protein product equivalent to the extracellular domain of the huFcγRII, this domain of the huFcγRII gene was amplified from the recombinant plasmid ThuRII by PCR and then cloned into the pET-28a vector. The recombinant plasmid pETshuRII, after identification by PCR and double digestion, was transformed into E.coli BL21 (DE3). The results of SDS-PAGE showed that the molecular mass (M r) of the expressed protein was 24.8×103, and the expression rate was 30%.The washed inclusion bodies contained recombinant shuRII at up to 90% purity. The recombinant protein was dissolved in 6 M guanidine buffer, and then refolded by rapid dilution. ELISA showed that the refolded shuRII was able to bind human IgG in a dose dependent manner and using flow cytometry, that it competitively inhibited the binding of human IgG to huFcγRII expressed on the surface of COS-7 cells. These results demonstrate that it is possible to obtain large quantities of recombinant shuRII with comparable IgG binding properties to that of the whole membrane bound huFcγRII.
     In order to express the receptor at the surface of a cultured cell, huFcγRII cDNA was cloned from human peripheral blood leucocytes by RT-PCR and a huFcγRII-expressing plasmid (pcDNA3-huFcγRII) was constructed. After verification by restriction digestion and PCR, the recombinant plasmid was transfected into COS-7 cells using lipofectamine. After screening by G418, a stable cell line expressing the receptor, identified by immunofluorescence and rosetting assays, was established. The result confirmed that the eukaryotic expression plasmid pcDNA3-huFcγRII was successfully constructed, and that the gene was transfected stably into COS-7 cells providing a solid experimental foundation for further investigation on the function of the huFcγRII gene.
     To identify the linear epitope for Fc-binding on huFcγRII, peptides derived from the EC2 domain of huFcγRII were synthesized and coupled to BSA as carrier protein. Binding of human IgG to the different peptides was tested by Dot-blot assay. The effective peptide corresponding to the sequence 151-163 of huFcγRII located in the putative F-G loop of the EC2 domain possessed the ability to bind human IgG. The coupled peptide containing the IgG-binding epitope efficiently inhibited the binding of human IgG to soluble huFcγRII as well as to transfected COS-7 cells expressing huFcγRII. The Fc-binding epitope peptide showed the capability of modulating the interaction of IgG and huFcγRII on cell surface.
     To study potential therapeutic properties of the peptide RII6-C6 in immune complex-mediated autoimmune disease, Female MRL/lpr mice (six weeks old) were purchased from SLACCAS. At seven weeks of age, mice were treated twice weekly with intraperitoneal RII6-C6 peptide. Experiments to find optimal dose were injected with 175μg per mouse, The treatment was stopped at 36 weeks of age. Mice were observed daily for clinical signs of disease and for mortality until the 40th week of age and were bled every two weeks for determination of anti-dsDNA and anti-ssDNA antibody titre; urine protein levels were determined in urine samples collected twice a week. Neither anti-dsDNA nor anti-ssDNA titres were significantly different in control and treated mice. Urine protein excretion was tested during the course of the treatment, Onset of proteinuria was significantly delayed (p<0.05) in the treated group and only 30% developed severe proteinuria, compared to 80% in the control group. The reduction in proteinuria in the treated group was accompanied by a striking increase in the survival rate. At the end of the treatment, 80% of RII6-C6 peptide-treated mice were still alive, whereas only 20% of the animals in the control groups survived. To determine whether treatment with RII6-C6 peptide led to histologically detectable changes, mice were examined for evidence of renal injury after treatment. Treatment with RII6-C6 peptide for 30 weeks significantly reduced mononuclear cells infiltration into the glomeruli and the deposition of IgG ICs, On the other hand, RII6-C6 peptide-treated mice showed no evidence of inflammatory disease, with only minimal mesangial expansion but essentially intact tubular architecture . Further confirmation of the ability of RII6-C6 peptide to prevent kidney damage was provided by detection of IgG deposits by immunostaining. Control mice showed deposition of glomerular ICs in kidney, whereas very slight ICs deposition was observed in RII6-C6 peptide-treated mice.
     These results demonstrated that the RII6-C6 peptide in the context of this murine autoimmune disease was effective in delaying the onset of proteinuria, reducing kidney damage and improving survival, and thus could provide a basis for the development of FcR-targeting drugs.
引文
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