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Updated: Dec 29, 2025

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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The function of p27 KIP1 during tumor development

Jinhwa Lee1, Sung Soo Kim

  • 1Department of Clinical Lab Science, Dongseo University, Busan 617-716, Korea.

Experimental & Molecular Medicine
|November 6, 2009
PubMed

Insights

The cell cycle regulator p27(KIP1) acts as both a tumor suppressor and oncogene, depending on its location and regulation. Its dual role, independent of gene mutation, offers insights into cancer development.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • Cell cycle progression relies on cyclin-dependent kinases (CDKs) tightly regulated by cyclin-dependent kinase inhibitors (CKIs).
  • p27(KIP1) is a crucial CKI whose cellular localization and regulation impact its function.
  • Dysregulation of p27(KIP1) is linked to various human cancers.

Purpose of the Study:

  • To review the fundamental characteristics and novel aspects of p27(KIP1).
  • To explore the distinct tumor-suppressing and oncogenic functions of p27(KIP1).
  • To understand the implications of p27(KIP1) dysregulation in cancer biology.

Main Methods:

  • Review of existing literature on p27(KIP1) regulation, localization, and function.
  • Analysis of studies investigating the dual roles of p27(KIP1) in normal and tumor cells.
  • Examination of the mechanisms underlying p27(KIP1) inactivation and its correlation with cancer prognosis.

Main Results:

  • p27(KIP1) exhibits context-dependent roles, functioning as a tumor suppressor in the nucleus and potentially as an oncogene in the cytoplasm.
  • Its tumor suppressor activity involves inhibition of cyclin/CDK complexes, while its oncogenic function is independent of these interactions.
  • Downregulation and cytoplasmic mislocalization of p27(KIP1) are associated with poor prognosis in several cancers.

Conclusions:

  • p27(KIP1) is an unconventional tumor suppressor, with its oncogenic potential arising from altered regulation and localization rather than gene mutation.
  • Understanding the separable tumor-suppressing and oncogenic functions of p27(KIP1) is critical for cancer research and therapeutic strategies.
  • Further investigation into p27(KIP1) regulation and localization may reveal new targets for cancer treatment.

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