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. 1983;2(7):1041–1047. doi: 10.1002/j.1460-2075.1983.tb01543.x

P53 transformation-related protein accumulates in the nucleus of transformed fibroblasts in association with the chromatin and is found in the cytoplasm of non-transformed fibroblasts.

V Rotter, H Abutbul, A Ben-Ze'ev
PMCID: PMC555232  PMID: 6354706

Abstract

The subcellular localization of the p53 molecule was studied in transformed and non-transformed fibroblasts. A newly established transformed cell line obtained by treating primary embryonic mouse cells in vitro with the chemical carcinogen methylcholanthrene was compared with the embryonic parent fibroblasts. The transformed cells lost the spindle shape characteristic of the parent fibroblasts, acquired an accelerated growth rate, developed into tumors when injected into syngeneic mice and expressed high levels of p53 synthesis estimated by immunoprecipitation of [35S]methionine-labeled cell extracts. The cellular localization of the p53 molecule was studied by immunofluorescent staining of fixed cells with monoclonal antibodies and by immunoprecipitation of [35S]-methionine-labeled p53 from various subcellular fractions. p53 was mainly found in the nucleus of the transformed fibroblast, while in the parent non-transformed primary embryonic cells, p53 was detected in the cytoplasm in a Triton X-100 soluble fraction, and associated with the cytoskeleton. The modulated distribution of p53 was also confirmed by analyzing a wide range of independently established transformed and non-transformed fibroblastic cell lines growing in vitro. The switch from the cytoplasmic localization of p53 in the non-transformed fibroblasts to a chromatin-associated accumulation in the transformed cells suggests a possible mechanism by which this protein may function in the transformed fibroblasts.

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