Objective To prepare a specific polyclonal antibody against full-length SUN5 for detecting the expression of SUN5 in human germ cells. Methods Bioinformatic methods were used to compare the full-length SUN5 and its variant SUN5β, and a short peptide was designed based on the differential region to prepare SUN5 antibody. The prepared antibody was used to detect the expression of SUN5 in Ntera-2 cells and in human germ cells by Western blotting and immunofluorescence assay. Results The short peptide was correctly synthesized and SUN5 antibody was obtained and purified. Western blotting showed that the prepared antibody was capable of recognizing full-length SUN5 in Ntera-2 cells, and SUN5 expression was localized on the nuclear membrane and in the cytoplasm as shown by immunofluorescence assay. Using this antibody, we detected SUN5 expression in the spermatocytes, round spermatids and sperms in human germ cells. Conclusion We successfully prepared SUN5-specific antibody. SUN5 is expressed in the spermatocytes, round spermatids and sperms in human germ cells, suggesting its important role in spermatogenesis.%目的：制备可检测全长SUN5的特异性抗体，并用该抗体检测SUN5蛋白在人类生殖细胞中的表达。方法通过生物信息学比较SUN5与新剪切体SUN5β之间的差异，在差异区域设计合成短肽，制备SUN5多克隆抗体并纯化。用新制备的SUN5抗体对Ntera-2细胞中的SUN5蛋白进行Western blotting和免疫荧光检测，验证抗体的特异性；最后，用该抗体对人睾丸细胞涂片进行检测，观察SUN5蛋白在人生殖细胞中的表达。结果成功合成了SUN5短肽，而且用该短肽制备了SUN5多克隆抗体。Western blot结果显示，新制备的SUN5特异性抗体可检测到全长SUN5蛋白。免疫荧光实验结果表明，在Ntera-2细胞中SUN5蛋白定位在核膜和胞浆。通过对人睾丸细胞涂片的检测发现，SUN5在睾丸精母细胞、圆形精子细胞及精子中均有表达。结论成功制备了SUN5特异性抗体，该特异性抗体的制备对于深入研究SUN5的功能具有重要的意义。此外，发现SUN5蛋白在精母细胞、圆形精子细胞及精子中均有表达，提示SUN5蛋白可能在精子发生中发挥着重要的生理功能。
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