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Nicotine transport in a human choriocarcinoma cell line (JAR).

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Smoking is a major health problem in pregnancy resulting in intrauterine growth retardation and birth complications. Nicotine, a toxic component of cigarette smoke, interferes with amino acid transport in the placenta and stimulates catecholamine release resulting in uteroplacental vasoconstriction.

Nicotine, cotinine, and anabasine inhibit aromatase in human trophoblast in vitro.

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Epidemiologic studies suggest that women who smoke have lower endogenous estrogen than nonsmokers. To explore the possible link between cigarette smoking and decreased endogenous estrogens, we have examined the effects of constituents of tobacco on estrogen production in human choriocarcinoma cells

Cancer incidence correlations: genital, urinary and some tobacco-related cancers.

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Bivariate correlations between sex-specific age-adjusted incidence rates of 10 genital and urinary tract cancer sites and lung cancer were calculated. The data base used was that published in the 5th edition of the series Cancer incidence in five continents. The purpose of the analyses was to test

Guanidine transport in a human choriocarcinoma cell line (JAR).

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OBJECTIVE Many endogenous substances and xenobiotics are organic cations. Transplacental transport of organic cations is an important determinant of the delivery of these compounds to the fetus. The aim of this study was to determine the mechanisms of organic cation transport using the human

Superfused microcarrier cultures of choriocarcinoma cells: a dynamic model for studying transport of glucose and amino acids.

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We here describe a novel procedure for culturing BeWo and JAr choriocarcinoma cells on solid microcarrier beads. The regime developed to stir the beads resulted, after about 10 days, in small aggregates of two to six beads covered with a layer of differentiated cells. Bead aggregates were packed

Cancer in Chiang Mai, North Thailand. A relative frequency study.

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The relative frequency of histologically diagnosed cancer at the Chiang Mai Medical School in North Thailand in 1964-67 inclusive is examined.Most of the 1877 cancers seen are in Thais (males, 927; females, 908), the remainder arising in Chinese (males, 21; females, 12), Hill People (males, 6;

Regulation of the choline transport system in superfused microcarrier cultures of BeWo cells.

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BeWo choriocarcinoma cells were cultured onto solid microcarrier beads, packed into syringe barrels and superfused. The unidirectional choline uptake across the microvillous membrane of the cells was measured by a rapid single-circulation paired-tracer dilution procedure using methyl[3H]choline with

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