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Updated: Jun 9, 2026

A DNA/Ki67-Based Flow Cytometry Assay for Cell Cycle Analysis of Antigen-Specific CD8 T Cells in Vaccinated Mice
09:17

A DNA/Ki67-Based Flow Cytometry Assay for Cell Cycle Analysis of Antigen-Specific CD8 T Cells in Vaccinated Mice

Published on: January 5, 2021

Regulation of memory CD8 T-cell differentiation by cyclin-dependent kinase inhibitor p27Kip1

Anju Singh1, Anna Jatzek, Erin Hemmila Plisch

  • 1Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA.

Molecular and Cellular Biology
|September 1, 2010
PubMed

Insights

The cyclin-dependent kinase inhibitor p27(Kip1) regulates CD8 T-cell memory formation. Removing p27(Kip1) enhances T-cell memory and recall responses, improving vaccine efficacy.

Area of Science:

  • Immunology
  • Cell Biology
  • Vaccinology

Background:

  • T-cell memory is crucial for effective vaccination.
  • Molecular mechanisms controlling CD8 T-cell memory formation are not fully understood.
  • Cell cycle regulation of CD8 T-cell proliferation and survival during immune responses is poorly defined.

Purpose of the Study:

  • To identify molecular regulators of CD8 T-cell homeostasis and memory formation.
  • To investigate the role of cell cycle regulators in CD8 T-cell responses to viral infection.
  • To determine the impact of p27(Kip1) on T-cell memory magnitude and quality.

Main Methods:

  • Studied CD8 T-cell responses in mice during acute viral infection.
  • Utilized genetic models to investigate the function of p27(Kip1).
  • Assessed T-cell proliferation, apoptosis, and memory recall responses.

Main Results:

  • Identified p27(Kip1) as a critical regulator of CD8 T-cell homeostasis.
  • p27(Kip1) acts as a timer for cell cycle exit, limiting memory precursor expansion.
  • Absence of p27(Kip1) resulted in enhanced CD8 T-cell memory and recall responses, particularly effector memory cells.

Conclusions:

  • p27(Kip1) critically controls CD8 T-cell homeostasis and memory formation.
  • Modulating p27(Kip1) can enhance vaccine-induced T-cell memory and protective immunity.
  • Findings provide insights into cell cycle regulation of T-cell memory.

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