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Preparation of Primary Acute Lymphoblastic Leukemia Cells in Different Cell Cycle Phases by Centrifugal Elutriation
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Cyclic AMP-induced p53 destabilization is independent of EPAC in pre-B acute lymphoblastic leukemia cells in vitro

Majid Safa1, Ahmad Kazemi, Farhad Zaker

  • 1Department of Hematology, School of Allied Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran. majid.safa@yahoo.com

Journal of Receptor and Signal Transduction Research
|May 31, 2011
PubMed
Abstract

Insights

Elevated cyclic adenosine monophosphate (cAMP) levels inhibit the tumor suppressor p53 in acute lymphoblastic leukemia (ALL) cells, impacting DNA-damage response. This cAMP-PKA pathway regulation affects cancer cell sensitivity to DNA-damaging agents.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cellular Signaling

Background:

  • The tumor suppressor protein p53 is crucial for cellular responses to genotoxic stress.
  • Activating wild-type p53 is vital for effective cancer cell killing by DNA-damaging therapies.

Purpose of the Study:

  • To investigate how cyclic adenosine monophosphate (cAMP) levels inhibit p53 protein in acute lymphoblastic leukemia (ALL) cells.
  • To identify the specific receptor through which cAMP promotes p53 degradation.

Main Methods:

  • Utilized forskolin/3-isobutyl-1-methylxanthine (IBMX) to stimulate p53 in ALL cell lines.
  • Employed Western blotting to detect p53, phospho-p53, acetylated-p53, phospho-cAMP response element-binding protein (CREB), and Mdm2.
  • Analyzed apoptosis via flow cytometry and gene expression of p53 and target genes using real-time PCR.

Main Results:

  • Elevated cAMP levels attenuated p53 accumulation in DNA-damaged ALL cells.
  • Proteasome inhibition reversed cAMP's inhibitory effect on p53.
  • PKA activators, but not a specific cAMP receptor agonist, decreased p53 accumulation.

Conclusions:

  • The cAMP-PKA pathway regulates sensitivity to DNA-damaging agents in B-cell precursor ALL (BCP-ALL) cells.
  • cAMP inhibits p53 through a p53-dependent pathway, influencing therapeutic outcomes.

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