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- W1978496913 abstract "Summary. Androgen binding protein (ABP) was detected in both the testis and epididymis of golden hamsters exposed to a long photoperiod (16L:8D). The concentration of ABP in the testis rose from 0·1 pmol/g testis in 2-week-old animals to attain maximum values (3·9 pmol/g testis) at 6–7 weeks, then declined to adult values (1·8 ± 0·4 pmol/g testis) after 10–11 weeks of age. In contrast, the ABP concentration of the caput epididymidis reached maximum values at 4–7 weeks of age (14 pmol/g tissue) and declined to adult values (4·8 ± 1·5 pmol/g tissue) by 10–11 weeks of age. ABP content of the corpus epididymidis was maximal (1·0 pmol/g tissue) at 2 weeks of age and thereafter declined to below detectable levels by 10–11 weeks. No ABP could be detected in the cauda epididymidis from animals of any age examined. Hamster ABP analysed by steady-state polyacrylamide gel electrophoresis had a relative mobility (Rf) of 0·33 compared to 0·41 for rabbit ABP. Sucrose gradient analysis of hamster ABP indicated a sedimentation coefficient of about 4 S. The binding of [3H]5α-dihydrotestosterone ([3H]5α-DHT) to hamster ABP was very rapid with equilibrium occurring within 10 min. The dissociation of [3H]5α-DHT from hamster ABP was also rapid (t½ = 2·77 min). Saturation analysis of ABP from mature animals yielded an apparent dissociation constant of 6·4 nm and an ABP concentration of 1·2 ± 0·2 pmol/mg protein. The binding of [3H]5α-DHT to hamster ABP was inhibited by 5α-DHT > testosterone > > > oestradiol > cyproterone acetate. Exposure of mature hamsters to a short photoperiod (8L:16D) for 3 weeks resulted in a 42% drop in epididymal ABP levels (10·3 to 4·3 pmol/g tissue). Epididymal ABP further declined so that after 15 weeks in a short photoperiod it was 4% (0·4 pmol/g) of initial values. Accompanying this decrease in epididymal ABP concentrations was a decline in the fertilizing ability of spermatozoa from the distal cauda. When hamsters were transferred from a short to a long photoperiod (16L:8D), epididymal ABP content returned to about 50% of control values within 3 weeks. However, the fertilizing ability of spermatozoa from the cauda epididymidis of these animals did not return to control values after a 9-week exposure to a stimulatory photoperiod." @default.
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- W1978496913 date "1987-09-01" @default.
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- W1978496913 title "Effects of photoperiod on androgen-binding protein and sperm fertilizing ability in the hamster" @default.
- W1978496913 doi "https://doi.org/10.1530/jrf.0.0810099" @default.
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