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. 1985 Mar;53(3):841–850. doi: 10.1128/jvi.53.3.841-850.1985

Altered processing of a major secreted phosphoprotein correlates with tumorigenicity in Rous sarcoma virus-transformed mammalian cells.

I Chackalaparampil, D Banerjee, Y Poirier, B B Mukherjee
PMCID: PMC254716  PMID: 2579246

Abstract

Anchorage-independent growth is highly correlated with neoplastic growth in vivo, and the retinoids (vitamin A and its analogs) inhibit this property in a wide variety of oncogenically transformed cells. We report here that retinoic acid-treated Rous sarcoma virus-transformed rat (RR1022) and vole (SR-1T) cells, which show reversible loss of anchorage-independent growth and assume nontransformed morphology, secrete a major 69-kilodalton phosphoprotein (pp69) instead of the 62-kilodalton phosphoprotein (pp62) secreted by their untreated counterparts. As determined by V8 protease mapping and by two-dimensional electrophoretic analysis, this 69-kilodalton polypeptide was indistinguishable from the pp69 released by nontransformed normal rat kidney cells. Neither retinoic acid-treated RR1022 cells nor normal rat kidney cells secreted pp62, and retinoic acid treatment did not have any significant effect on the synthesis, subcellular localization, or phosphokinase activity of pp60src. Furthermore, treatment with retinoic acid did not alter the synthesis of the transformation-specific 53-kilodalton phosphoprotein (p53) and secretion of the transforming growth factors in RR1022 cells. Our studies showed that there is a clear correlation between the release of pp69 or pp62 and the ability of cells to grow in vitro with or without anchorage. This may provide an important clue for elucidating specific biochemical events involved in anchorage regulation of growth.

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