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- W1498362729 abstract "Treatment of cultured rat hepatocytes with certain amino acids stimulates the activity of the System N transporter. The present report investigates the mechanism by which the stimulatory amino acids elicit their effect. Activation of System N-mediated transport by amino acids is rapid, cycloheximide-insensitive, and involves neither trans-stimulation nor recruitment of additional carriers to the plasma membrane. In addition, the activation is Na(+)-dependent, supporting the related observation that the most effective stimulatory amino acids are substrates of Na(+)-dependent transport Systems A, ASC, and N whereas substrates of Na(+)-independent System L and non-amino acid metabolites are ineffective. The data suggest that active accumulation of amino acids via Na(+)-dependent carriers is necessary for the activation to occur. The amino acid-dependent stimulation is blocked in a concentration-dependent manner by increasing extracellular K+. Treatment of hepatocytes with an amino acid such as asparagine causes cell swelling and stimulation of System N activity; both of these effects are reduced by hypertonic media. Furthermore, swelling of rat hepatocytes with hypotonic media mimics the System N-stimulatory effects of asparagine. Among the Na(+)-dependent amino acid transport systems present in rat hepatocytes, System N is stimulated preferentially by amino acid-containing or hypotonic media. Collectively, these results demonstrate that cell swelling is a prerequisite for the amino acid-dependent activation of the hepatic System N transporter." @default.
- W1498362729 created "2016-06-24" @default.
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- W1498362729 date "1991-04-01" @default.
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- W1498362729 title "Amino acid-dependent increase in hepatic system N activity is linked to cell swelling." @default.
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- W1498362729 doi "https://doi.org/10.1016/s0021-9258(20)89457-5" @default.
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