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Res Commun Mol Pathol Pharmacol. 1994 Sep;85(3):359-62.

Enhanced expression of catalytic subunits of protein phosphatase type 1 and high S-phase fraction in liposarcoma.

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Department of Pathology, Kagawa Medical School, Japan.


The expression of the three catalytic subunits of protein phosphatase (PP) type 1 and 2A, PP1 alpha, PP1 gamma 1, and PP2AC, was examined in 8 cases of lipoma as a benign tumor and 4 cases of liposarcoma as a malignant tumor using immunohistochemical analysis. Both types of of tumor cells stained positively with antisera against PP1 catalytic subunit isoforms PP1 alpha and PP1 gamma 1 were significantly higher in liposarcoma than in lipoma. Furthermore, liposarcoma showed a markedly high S-phase fraction in the cell cycle of tumor cells, as compared with lipoma. These results suggest that PP1 is involved in the accelerated growth of malignant cells in liposarcoma.

[Indexed for MEDLINE]

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