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J. Biol. Chem., Vol. 256, Issue 22, 11420-11423, Nov, 1981

Removal of the surface-bound human choriogonadotropin results in the cessation of hormonal responses in cultured Leydig tumor cells

DL Segaloff and M Ascoli

The relationship between the binding and internalization of human choriogonadotropin and the stimulation of cAMP and steroid production was studied in cultured Leydig tumor cells. It was found that removal of the surface-bound hormone results in a rapid cessation of both cAMP and steroid production. We propose that the surface-bound hormone is responsible for the activation of steroidogenesis and that hormone internalization is involved in the deactivation of this process.
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