Objective To prepare a high‐titer rabbit specific serum antibody against Kaposi′s sarcoma associated herpesvirus (KSHV) ORF65 capsid protein and identify the specificity of serum antibody .Methods Artificial synthetic peptide of ORF65 pro‐tein was emulsified with Freund adjuvant .4 rabbits were immunized with the prepared antigen by subcutaneous injection at various sites of skin of back and jaw once every two weeks .Immunization was carried out in total 4 times .The serum of the immunized rab‐bits was collected at a week after the last immunization .The titer of rabbit anti‐serum was assayed by ELISA .Specificity of the rab‐bit anti‐serum was analyzed by immunofluorescence assay and Western blot .Results The immunized rabbits produced high‐titer se‐rum antibody after total immunization .The highest titer of anti‐serum against ORF65 protein peptide was 1∶12 800 .The results of Immunofluorescence assay showed that antibody was binded in plasma of BCBL‐1 cell mostly ,which was consistent with the expres‐sion location of ORF65 in BCBL‐1 cell .Subsequently ,the data of Western blot revealed a specific band about 21 kD which accorded with the size of ORF65 protein .Meanwhile ,the expression of ORF65 in TPA treated BCBL‐1 cells was higher than the control cells ,which was consistent with the expression characteristics of lytic protein .Conclusion High‐titer specific rabbit serum antibody against KSHV capsid ORF65 antigen could be successfully prepared by rabbits immunization with ORF65 protein peptide .The pre‐pared antibody could be revealed immune reaction specificity with KSHV ORF65 protein .%目的：制备高效价卡波氏肉瘤相关疱疹病毒（KSHV）病毒ORF65衣壳蛋白抗体并检测其特异性。方法将人工合成的ORF65蛋白抗原肽经弗氏佐剂乳化，在家兔背部、颌下等皮下多点免疫注射，间隔2周免疫，共4次。末次免疫后1周取兔血清，ELISA法检测兔免疫血清抗体IgG抗体水平。进一步采用免疫荧光、Western blot检测制备的抗血清中与ORF65结合的特异性。结果家兔在全程免疫后产生了高效价的特异性抗体，最高滴度达1∶12800。免疫荧光检测显示，与未经佛波酯（TPA）刺激的BCBL‐1细胞相比，兔抗血清主要结合于BCBL‐1细胞胞质，与ORF65蛋白在细胞内表达位置一致。Western blot结果显示在21 kD处有特异性蛋白条带，其大小与预期的ORF65蛋白大小相符，同时经T PA刺激的BCBL‐1细胞中ORF65蛋白表达量高于对照组，与ORF65蛋白裂解期蛋白的特性相符。结论用ORF65衣壳蛋白抗原肽段免疫家兔，可成功制备高效价的特异性抗血清，该抗体可与KSHV病毒ORF65蛋白特异性结合。
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