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The Stimulation by Methotrexate of Human Chorionic Gonadotropin and Placental Alkaline Phosphatase in Cultured Choriocarcinoma Cells

Gene Regulation Section, Laboratory of Molecular Biology, Division of Cancer Biology and Diagnosis, National Cancer Institute, Bethesda, Maryland 20014²

Treatment of the BeWo line of choriocarcinoma cells with methotrexate in doses that inhibit DNA synthesis causes a tenfold increase in synthesis of human chorionic gonadotropin and a threefold increase in activity of placental alkaline phosphatase. No concomitant increase in lactic dehydrogenase activity occurs under these conditions. This effect of methotrexate can be blocked by simultaneous addition of thymidine or folinic acid, neither of which alone increases human chorionic gonadotropin synthesis or placental alkaline phosphatase activity in BeWo cells.

¹ Present address: Department of Medicine, Vanderbilt University Medical School, Nashville, Tenn.

² Address to which requests for reprints should be addressed.

Received 6/25/76. Accepted 9/14/76.

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