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- W2003182014 abstract "Bulls (N = 42) ranging in age from 1 day to 5.5 years were used to determine whether a change in the concentration of FSH receptors in the bovine testis occurred as bulls matured. 125I-labelled human FSH was used as the ligand to evaluate binding to bovine testicular membranes. Membrane fractions were collected by centrifugation of testicular homogenates at 120 g and recentrifugation of the 120 g supernatant at 1250 g. Relative binding activity of membrane sedimented at 1250 g was determined after incubation of membranes with 125I-labelled FSH for 16--18h at 25 degrees C, followed by centrifugation (1250 g) to separate bound from free hormone. Specifically bound FSH when expressed as fmol/mg protein was negatively correlated with age (r = -0.73). The association constant (Ka) determined by Scatchard analysis was the same for bulls at all ages with a mean (+/- s.e.m.) Ka = 1.5 +/- 0.3 x 10(9) M-1. Concentration of FSH receptors on a per mg protein basis declined rapidly from birth to 2.5 years of age and remained low up to 5.5 years of age. On a whole testis basis the total number of receptors increased as the bulls matured. After 2.5 years of age total testicular binding did not change." @default.
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- W2003182014 date "1982-09-01" @default.
- W2003182014 modified "2023-10-17" @default.
- W2003182014 title "Testicular FSH receptor numbers and affinity in bulls of various ages" @default.
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- W2003182014 doi "https://doi.org/10.1530/jrf.0.0660039" @default.
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