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Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...

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CDKN1B/p27 expression in peripheral T cell lymphoma not otherwise specified.

Anna Gazzola1, Maria Teresa Sista, Claudio Agostinelli

  • 1Department of Haematology and Oncological Sciences L and A Seràgnoli, S. Orsola-Malpighi Hospital, University of Bologna, Bologna, Italy.

Journal of Clinical Pathology
|November 4, 2010
PubMed
Summary

Aberrations in CDKN1B/p27 are uncommon in Peripheral T cell lymphoma not otherwise specified (PTCL/NOS) pathogenesis. Studies found no mutations or expression changes, suggesting CDKN1B/p27 is not a key driver in PTCL/NOS.

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Area of Science:

  • Hematology
  • Oncology
  • Molecular Biology

Background:

  • Peripheral T cell lymphoma not otherwise specified (PTCL/NOS) is a common subtype of PTCL.
  • Proliferation pathways are frequently altered in PTCL/NOS.
  • CDKN1B/p27, a cell cycle regulator, is implicated in T cell lymphomagenesis.

Purpose of the Study:

  • To investigate the occurrence of CDKN1B/p27 aberrations in PTCL/NOS.
  • To assess the role of CDKN1B/p27 in the pathogenesis of PTCL/NOS.

Main Methods:

  • Analyzed CDKN1B/p27 expression at RNA and protein levels using DNA and tissue microarrays.
  • Performed direct sequencing of CDKN1B in PTCL/NOS cases.
  • Utilized immunohistochemistry to evaluate p27 expression in neoplastic cells.

Main Results:

  • CDKN1B mRNA expression was similar in PTCL/NOS and normal T lymphocytes.
  • No structural abnormalities (mutations, deletions) in CDKN1B were detected.
  • Physiological p27 expression was observed, mutually exclusive with Ki-67.
  • Expression of cell cycle regulators like CCNE1 was not affected.
  • p27 expression did not correlate significantly with overall survival.

Conclusions:

  • CDKN1B/p27 aberrations appear infrequent in PTCL/NOS.
  • CDKN1B/p27 is unlikely to be a major factor in PTCL/NOS development.