小鼠Lyzls的表达特征及人LYZL6蛋白的抗菌特性研究

C类溶菌酶基因（Lyzls）属于溶菌酶基因家族，高表达于小鼠睾丸和附睾。该家族基因Lyzl4和Spaca3被报道在小鼠精卵融合和受精过程中发挥作用。然而其他两种小鼠C类溶菌酶基因Lyzll他HLyzl6的功能尚不清楚。本研究分析了小鼠C类溶菌酶基因的组织表达、表达与雄激素的关联以及重组人LYZL6蛋白（rLYZL6）在免疫中可能发挥的作用。通过RT-PCR、Westernblots、免疫组织化学和免疫荧光的方法分析了Lyz＆的表达，细菌集落形成测定实验分析了重组人LYZL6蛋白的抗菌活性。小鼠lyzls主要在睾丸和附睾中表达，受发育调控及雄激素或睾丸因子调控。免疫检测LYzL6蛋白定位于小鼠睾丸的初级精母细胞、圆形精子和成熟精子的顶体后及中段。重组人LYZL6蛋白呈现抗菌活性。我们推测Lyzls可能在精子线粒体的功能中发挥作用，LYZL6蛋白在雄性生殖道免疫中发挥作用。

Characterisation of Lyzls in mice and antibacteria properties of human LYZL6

C-type lysozyme genes （Lyzls） belong to the class of lysozymes and are highly expressed in the testis and epididymis. The members Lyzl4 and Spaca3 have been reported to play a role in sperm-egg binding and fertilisation in mice. However, the function of the remaining two mouse c-type lysozyme genes, Lyzll and Lyzl6, is still not clear. In the present study, we analysed the tissue expression and androgen-dependent expression of mouse c-type lysozyme genes and the possible contribution of human recombinant LYZL6 （rLYZL6） to immunity. The expression of Lyzlswas detected by RT-PCR, Western blots, immunohistochemistry and immunofluorescence. The bacteriolytic activity of rLYZL6 was analysed by a colony-forming assay. In mice, the expression of Lyzlgenes was mainly in the testis and epididymis in a developmentally regulated manner and androgen- or testicular factor-regulated manner. Immunodetection revealed the presence of LYZL6 protein in primary spermatocytes and round spermatids of the testis and on the post-acrosomal area and midpiece of mature epididymal spermatozoa. The rLYZL6 protein exhibited antibacterial activity. From the results, Lyzls may play a role in mitochondrial function of spermatozoa and LYZL6 may contribute to the innate immunity of the male genital tract.