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Early events in murine erythroleukemia cells induced to differentiate. Accumulation and gene expression of the transformation-associated cellular protein p53.

Abstract：

:Oncogenes may play a crucial role in the genetic program of cellular differentiation; even, probably, at a very early stage in this program, which can be described as pre-commitment. We have investigated the variation in, and the control level of, the accumulation of the transformation-associated cellular protein p53 in murine erythroleukemia cells induced to differentiate by hexamethylene bisacetamide. Using flow cytofluorimetry after double staining of the cells, we have found that p53 decreased from two hours after the input of the inducer, to reach a basal level of about 30% of the starting value. The stability of the protein was found to be affected neither by the inducer nor by the position of the cells in the cell cycle. Looking for the regulation mechanism of the p53 decay, we found that the mRNA started to decrease as early as half an hour after the hexamethylene bisacetamide was put in the culture medium, and that the transcription rate of the gene itself could not account for the observed down-regulation of the mRNA, suggesting a post-transcriptional control for the mRNA accumulation. This control did not require the de-novo synthesis of a protein component, as shown by cycloheximide experiments, but seemed to be governed by the induced synthesis of an RNA molecule. Hypothetical models for such a regulation process are discussed in the light of recent reports on the metabolism of mRNA.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Khochbin S,Principaud E,Chabanas A,Lawrence JJ

doi

10.1016/0022-2836(88)90333-6

subject

Has Abstract

pub_date

1988-03-05 00:00:00

pages

55-64

issue

1

eissn

0022-2836

issn

1089-8638

pii

0022-2836(88)90333-6

journal_volume

200

pub_type

杂志文章

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