Effects of castration and hormone replacement on male sexual behavior and pattern of expression in the brain of sex-steroid receptors in BALB/c AnN mice.
Little is known about the hormonal regulation of sexual behavior and about the pattern of expression in the brain of sex-steroid receptors in the BALB/c AnN strain of mice (Mus musculus). In this study, 8-week old male BALB/c AnN mice were castrated and the temporal course of decline of sexual behavior was studied, as well as the effects of daily treatment with either testosterone propionate (TP), estradiol benzoate (EB), or dihydrotestosterone propionate (PDHT). Castration resulted in rapid decline of sexual behavior, in both control or vehicle-treated mice. TP maintained full sexual behavior of castrated mice, while PDHT or EB did not have this effect. The expression of ER-alpha dropped nearly 50% after castration, and this pattern remained in TP or PDHT-treated mice, while EB increased the ER-alpha mRNA levels to almost the same values as in intact control mice. The same pattern was found when ER-beta mRNA levels were analyzed. The expression of the PR-A/B gene in the different brain regions in intact mice and after castration, or among the differently treated mice, showed significant differences between normal and castrated mice at all times in all brain regions studied, with the exception of the frontal cortex. Castration reduced the expression of AR by 10-fold, as compared to intact control mice, while TP or PDHT treatment returned its expression to the same levels as in intact control mice, in all brain areas studied. The changes are more prominent in POA-HIP than in HYP and CF. These results demonstrated a rapid decline of sexual behavior in this strain of mice after castration, and show that only TP was able to maintain male sexual behavior, with no correlation with the pattern of expression of sex hormone receptors in specific areas of the mouse brain.
Arteaga-Silva
Marcela
M
Departamento de Biología de la Reproducción, Universidad Autónoma Metropolitana-Iztapalapa, AP 55535, México, D.F. 09340, Mexico.
Rodríguez-Dorantes
Mauricio
M
Departamento de Inmunología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, AP 70228, México, D.F. 04510, Mexico.
Baig
Salman
S
Infectious Diseases Section, Department of Medicine, Baylor College of Medicine, I Baylor Plaza, 535EA, Houston TX 77030, USA.
Morales-Montor
Jorge
J
Departamento de Biología de la Reproducción, Universidad Autónoma Metropolitana-Iztapalapa, AP 55535, México, D.F. 09340, Mexico. Electronic address: jmontor66@biomedicas.unam.mx.
D000818:Animals; D001921:Brain / Q000187:drug effects / Q000378:metabolism*; D002369:Castration; D013196:Dihydrotestosterone / Q000031:analogs & derivatives / Q000494:pharmacology; D004542:Ejaculation / Q000187:drug effects; D004958:Estradiol / Q000031:analogs & derivatives / Q000494:pharmacology; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D020249:Hormone Replacement Therapy; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D011944:Receptors, Androgen / Q000235:genetics / Q000378:metabolism; D011960:Receptors, Estrogen / Q000235:genetics / Q000378:metabolism; D011980:Receptors, Progesterone / Q000235:genetics / Q000378:metabolism; D011987:Receptors, Steroid / Q000235:genetics* / Q000378:metabolism; D012726:Sexual Behavior, Animal / Q000187:drug effects / Q000502:physiology*; D043343:Testosterone Propionate / Q000494:pharmacology
D011944:Receptors, Androgen; D011960:Receptors, Estrogen; D011980:Receptors, Progesterone; D011987:Receptors, Steroid; D013196:Dihydrotestosterone; C074283:estradiol 3-benzoate; D004958:Estradiol; C030445:dihydrotestosterone propionate; D043343:Testosterone Propionate