Wild-type p53 modulates apoptosis of normal, IL-3 deprived, hematopoietic cells.

Abstract:

:Apoptotic cell death is an active process which regulates the maintenance of the hematopoietic homeostasis. It has been reported that wild-type p53 (wt-p53) protein induces apoptosis in leukemia cells. To assess whether p53 is involved in the apoptotic process of normal hematopoietic cells, we introduced the temperature-sensitive p53Val135 mutant into the murine myeloid precursor cell line 32Dcl3. These are diploid, non-tumorigenic cells whose survival and proliferation are dependent upon growth factor supply (IL-3 and serum). Overexpression of wt-p53 protein does not affect morphology and proliferation of 32D cells as long as they are maintained in the presence of IL-3. However, after IL-3 withdrawal, wt-p53 overexpression significantly accelerates apoptosis. This phenomenon is IL-3 specific since no differences in death rates induced by serum starvation are found between parental cells and p53-transfectants. When the latter experiments are carried out at 37 degrees C with p53 protein in mutant conformation, an extended survival of 32D cells is observed after IL-3 deprivation, but not after serum withdrawal. Taken together, these results show that wt-p53 actively mediates the apoptosis due to the absence of specific growth factors, such as IL-3, suggesting that p53 might be involved in the response of myeloid precursors to environmental cytokines for the maintenance of the hematopoietic homeostasis.

journal_name

Oncogene

journal_title

Oncogene

authors

Blandino G,Scardigli R,Rizzo MG,Crescenzi M,Soddu S,Sacchi A

subject

Has Abstract

pub_date

1995-02-16 00:00:00

pages

731-7

issue

4

eissn

0950-9232

issn

1476-5594

journal_volume

10

pub_type

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