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- W1979594080 abstract "A dog raised as a female pup did not have utero-ovarian structures when ovariohysterectomy was attempted at 6 mo of age. Three months later, the dog exhibited male-like behavior, and 2 symmetrical testicular-shaped structures arose bilateral to the vulva. Intersex cases such as this one may involve chromosomal abnormalities, defects in testicular secretions or androgen insensitivity in tissues of the sex accessories. Serum concentrations of testosterone and dihydrotestosterone were measured in the intersex and in intact normal male (control; n=7) dogs. In addition, 5α-reductase enzyme activity was determined in the gonadal tissue of the intersex dog and control dogs. Androgen receptors were studied in cultured fibroblasts from the genital skin of the intersex and control dogs. The cytogenetic studies identified the animal's karyotype to be 78 XY. All complete cells from the gonadal tissue showed an XY sex chromosome complement. Serum testosterone concentrations before and after challenge with hCG were not different between the intersex and control dogs (6.2 vs 5.72 ± 1.8 ng/ml and 9.5 vs 8.69 ± 2.39 ng/ml before and after hCG challenge, respectively). Similarly serum dihydrotestosterone concentrations were not different between the intersex and control dogs before and after challenge with hCG (158 vs 162 ± 1.4 pg/ml and 270 vs 278.71 ± 45.98 pg/ml before and after hCG challenge, respectively). The 5α-reductase enzyme activity of the gonads was not different between the intersex and control dogs (105 pmol/h/mg protein vs 110 ± 2.4 pmol/h/mg protein). The Bmax values of binding in the control dogs fibroblast strains were 25 ± 3.5 fmol/mg protein. However, specific binding of dihydrotestosterone was virtually undetectable in the fibroblasts cultured from the intersex dog. These results exclude chromosomal abnormalities and deficient secretion of testosterone and dihydrotestosterone as causative factors. Because fibroblasts cultured from genital skin lacked any ability to specifically bind dihydrotestosterone, it is suggested that nonfunctional androgen receptors in some tissues of the sex accessories contributed to the feminine phenotype of this particular dog." @default.
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- W1979594080 date "1993-11-01" @default.
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- W1979594080 title "Phenotypic feminization in a genetic male dog caused by nonfunctional androgen receptors" @default.
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- W1979594080 doi "https://doi.org/10.1016/0093-691x(93)90377-h" @default.
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