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Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Phorbol ester stimulated Cip1 expression in p53-negative leukemic cells.

J Devente1, W Bryant, K Posekany

  • 1E CAROLINA UNIV,SCH MED,DEPT MED,DIV ENDOCRINOL,GREENVILLE,NC 27858. E CAROLINA UNIV,SCH MED,DEPT IMMUNOL MICROBIOL,GREENVILLE,NC 27858.

Oncology Reports
|May 20, 2011
PubMed
Summary

Cyclin-dependent kinase interacting protein (Cip1) induces G(1) arrest in differentiating leukemic cells. However, in PKC-zeta cells, Cip1 is induced without G(1) arrest, leading to apoptosis instead of differentiation.

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Proliferation and Differentiation of Murine Myeloid Precursor 32D/G-CSF-R Cells

Published on: February 21, 2018

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Cyclin-dependent kinase interacting protein (Cip1) is known to induce G(1) cell cycle arrest during the differentiation of leukemic cells.
  • Protein kinase C (PKC) isoforms play critical roles in cellular signaling pathways, influencing differentiation and apoptosis.
  • U937 monoblastoid cells are a relevant model for studying leukemic cell differentiation.

Purpose of the Study:

  • To investigate the role of Cip1 and PKC-zeta in the differentiation and cell cycle regulation of U937 monoblastoid cells.
  • To elucidate the signaling pathways involved in TPA-induced differentiation and apoptosis.
  • To determine if Cip1 induction is sufficient to cause G(1) arrest in all cellular contexts.

Main Methods:

  • Treatment of U937 monoblastoid cells and U937 cells overexpressing PKC-zeta (PKC-zeta cells) with TPA (12-O-tetradecanoylphorbol-13-acetate).
  • Analysis of Cip1 expression, retinoblastoma protein (Rb) phosphorylation status, and cell cycle progression (G(1) arrest).
  • Assessment of cellular differentiation and apoptosis induction.

Main Results:

  • TPA-treated U937 cells expressed Cip1, showed hypophosphorylated Rb, arrested in G(1), and differentiated.
  • TPA-treated PKC-zeta cells exhibited altered PKC isoform expression.
  • TPA-treated PKC-zeta cells underwent apoptosis without differentiation, despite expressing Cip1 and showing Rb hypophosphorylation, failing to arrest in G(1).

Conclusions:

  • A novel phorbol ester-dependent signaling pathway exists where Cip1 induction can occur independently of G(1) arrest.
  • In the context of PKC-zeta overexpression, Cip1 induction is associated with apoptosis rather than differentiation.
  • These findings highlight the complex interplay between PKC isoforms, Cip1, and cell cycle control in determining cell fate.