✦ LIBER ✦

Polyamine metabolism in enucleated mouse L-cells

✍ Scribed by Frank McCormick

Publisher: John Wiley and Sons
Year: 1977
Tongue: English
Weight: 629 KB
Volume: 93
Category: Article
ISSN: 0021-9541
DOI: 10.1002/jcp.1040930214

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✦ Synopsis

Abstract

The distribution of polyamines between the nucleus and the cytoplasm, and the role of the nucleus in polyamine metabolism, have been studied using cells enucleated with cytochalasin B. Spermidine and spermine were found in the nuclear and the cytoplasmic fractions of L929 cells; their concentration was 3‐fold higher in the former fraction. Ornithine decarboxylase activity was only found in the cytoplasm, and this activity could be stimulated in enucleated cells by the addition of fresh medium. These cells synthesized putrescine actively, but the putresoine made was not converted to spermidine, and accumulated to relatively high concentrations. Similarly, methionine did not act as a precursor to spermidine in enucleated cells, in contrast to whole cells, although it was incorporated into cell protein. Spermidine synthesis, unlike putrescine synthesis, appears to be completely dependent on a nuclear component.

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