雄激素受体敲除后雄性小鼠的泌尿生殖系统表型

Genitourinary phenotype of androgen receptor knockout mice

目的 了解敲除雄激素受体 (AR)后雄性小鼠的泌尿生殖系统表型。 方法 采用Cre lox技术 ,雌性Flox AR小鼠与雄性ACTB Cre小鼠交配 ,PCR方法检测子代小鼠尾巴的基因型 ,筛选出AR敲除小鼠 5只 ,5只AR未被敲除的小鼠作为对照。比较 2组小鼠的泌尿生殖系统表型 ,测量肛门生殖器距离、睾丸重量、血清睾酮及雌二醇浓度。 结果 AR敲除 (ARKO)组小鼠肛门生殖器距离为 (0 .5± 0 .1)cm ,对照组为 (1.1± 0 .1)cm。ARKO组前列腺、精囊、附睾及球海绵体肌均缺如 ,睾丸显著缩小 ,重量 (0 .0 0 6± 0 .0 0 1) g ;对照组前列腺、精囊、附睾及球海绵体肌发育正常 ,睾丸重量为 (0 .0 86± 0 .0 0 2 ) g。ARKO组血清睾酮浓度 (0 .0 5 6± 0 .0 4 5 )nmol/L ,雌二醇浓度 (1390 .1± 2 94 .3) pmol/L ,对照组睾酮浓度 (0 .84 3± 0 .736 )nmol/L ;雌二醇浓度 (786 .2± 15 0 .8) pmol/L。差异均有统计学意义 (P <0 .0 5 )。 结论 敲除雄激素受体后 ,小鼠前列腺、精囊、附睾及球海绵体肌缺如 ,睾丸缩小 ,雄激素水平降低 ,雌激素水平升高 ,提示AR在雄性小鼠泌尿生殖系统发生及雄激素水平调节中发挥重要作用。

Objective To investigate the genitourinar y phenotype in androgen receptor knockout (ARKO) mice. Methods Using Cre-lox technique, the female Flox-AR mice were crossed with male ACTB-Cre mice,and the genotype of their filial generations was confirmed by PCR .By screening,5 ARKO mice were generated as study subjects and 5 wild type mice served as controls.The genitourinary phenotypes of the 2 groups were compared.Th e anal genital distance and testis weight were measured;serum testosterone and e stradiol levels were assayed by ELISA. Results The anal genital distance in ARKO group was (0.5±0.1)cm,while it was (1.1±0.1)cm in wil d type group.The prostate,seminal vesicle, epididymis and spherical cavernous bo dy muscle were absent in ARKO group with the reduced testis weight of (0.006 ± 0.001)g;while those were normal with the testis weight of (0.086±0.002)g in w ild type group.The serum testosterone level in ARKO group was (0.056±0.045)nmol /L,and it was (0.843±0.736)nmol/L in wild type group.The serum estradiol level in ARKO group was (1390.1±294.3)pmol/L,and it was (786.2±150.8)pmol/L in wild type group.The differences were statistically significant between the 2 groups ( P < 0.05). Conclusions In ARKO mice,the prostate,s eminal vesicle,epididymis and spherical cavernous body muscle are absent with th e reduced testis,decreased androgen and increased estrogen levels.It is suggeste d that androgen receptor plays an important role in male genitourinary system.