KM突变小鼠皮肤T、B细胞数量分布和皮肤细胞凋亡增殖的动态改变

Dynamic Changes of the Quantitative Distribution,Apoptosis and Proliferation of T and B Cells in the Skin of KM Mutant Mice

目的观察不同年龄段KM突变小鼠皮肤T、B淋巴细胞的数量和分布,表皮及毛囊皮脂腺细胞凋亡和增殖情况。方法采用血常规、免疫组织化学检测KM突变小鼠皮肤T、B淋巴细胞改变情况,TUNEL技术和增殖细胞核抗原（PCNA）染色检测1 d、3 d、6 d、9 d、22 d、3个月、6个月KM突变小鼠皮肤组织背皮细胞凋亡和增殖情况。结果 KM突变小鼠皮肤T细胞主要表达在表皮及真皮,出生第1天至第6天增多,9 d、22 d减少,3个月以后增多,6个月时可见B细胞增多。KM突变小鼠凋亡细胞主要分布在毛囊和皮脂腺,较野生小鼠增多,且两种小鼠均在22 d时凋亡细胞数目最多;出生1～9 d的KM突变小鼠皮肤表皮基底细胞增殖与野生小鼠无差异,22 d和3个月增殖减少,但6个月时增殖多;毛囊及皮脂腺细胞22 d时增殖较多,9 d和3月龄增殖减少。结论 KM自发突变小鼠皮肤组织存在T、B淋巴细胞数量分布及毛囊皮脂腺细胞凋亡和增殖的异常改变,引起免疫学紊乱和被毛异常生长,促进了炎症反应。

Objective To observe the change of quantitative distribution,apoptosis and proliferation of T and B cells in the skin of KM mutant mice. Methods We chose 1-,3-,6-,9-,22-day,3-,6-month-old KM mutant and wild-type mice to detect the changes of T and B lymphocytes using blood routine tests and immu-nohistochemical staining. Apoptosis was detected by TUNEL staining and proliferation by proliferating cell nuclear antigen（ PCNA） staining. Results T cells on KM mutant mice skin were mainly seen in epidermis and dermis.They increased on the first day to 6^th day after birth and decreased on the 9^th and 22^nd day,but after 3-monthold,their number began to increase; at the time of 6 months,the number of B cells also increased. The apoptosis of the skin hair follicle and sebaceous gland cells were more obvious in KM mutant mice than in wild-type mice,with the maximal apoptosis occurred at the age of 22-day-old in both groups. The proliferation of epidermal basal cells in KM mutant mice between 1 to 9-day-old was not significantly different from that in the wild-type mice,but decreasing on the 22^nd day and 3^rd month and increasing in the 6thmonth. The proliferation in hair follicle and sebaceous glands decreased on 9^th day,increased on 22^nd day,and deceased on the 3^rd month again.Conclusions The quantitative distribution,apoptosis,and proliferation of T and B lymphocytes abnormally change in the skin tissue of KM spontaneous mutant mice. They may lead to immune and hair growth disorders and promote the inflammatory responses.