On the mechanisms involved in the regulation of the cell-surface receptors for human choriogonadotropin and mouse epidermal growth factor in cultured Leydig tumor cells.

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Abstract
The MA-10 cells are a clonal strain of mouse Leydig tumor cells that have receptors for human choriogonadotropin (hCG) and mouse epidermal growth factor (mEGF). Exposure of the cells to hCG results in a reduction in the number of surface hCG receptors, and little or no change in the number of surface mEGF receptors. Exposure of the cells to mEGF results in a reduction in the number of both surface mEGF receptors and surface hCG receptors. In order to study these phenomena, it was assumed that the number of surface receptors is determined by the rate at which receptors appear at the surface and by the rate of receptor internalization. Measurement of these rates revealed that hCG and mEGF reduce their respective surface receptors by increasing the rate of receptor internalization, and mEGF reduces the surface hCG receptors by decreasing the rate of appearance of the receptor.

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