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. 1995 Jan 1;305(Pt 1):291–299. doi: 10.1042/bj3050291

Regulation of the efflux of putrescine and cadaverine from rapidly growing cultured RAW 264 cells by extracellular putrescine.

R R Tjandrawinata 1, C V Byus 1
PMCID: PMC1136462  PMID: 7826344

Abstract

Cultures of the macrophage-like RAW 264 cells were adapted to divide normally in a synthetic serum-supplemented culture medium lacking any polyamines and diamine oxidase activity. These rapidly dividing cells actively effluxed large amounts of putrescine and cadaverine, compared with the intracellular levels, into the culture medium. The efflux of putrescine was stimulated by the amino acid ornithine, whereas efflux of cadaverine was inhibited. Relatively low levels of spermidine and N1-acetyl-spermidine, compared with those of exported putrescine, were observed to accumulate in the culture medium. A careful analysis of the changes in the intracellular concentration of putrescine relative to the steady-state net rate of putrescine export, as the doubling time of the cultures increased from 16 h to 22 h, indicated that an inverse relationship existed between these two parameters. As the intracellular putrescine concentrations increased, the net rate of putrescine export decreased markedly. Determination of the rate of putrescine uptake indicated that putrescine uptake also decreased significantly as the cultures neared confluency, and at no time during the growth of the culture did the rate of putrescine uptake approximate to the high rate of putrescine efflux. The decrease in the putrescine export rate seen as the cells grew toward confluency was determined to be primarily due to the inhibitory effect of the effluxed putrescine in the medium (Ki = 2 microM), and not to contact inhibition. The data suggested that the efflux of putrescine and cadaverine is not mediated to a significant degree by a process involving simple diffusion.

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Selected References

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