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Inhibition of KIF22 suppresses cancer cell proliferation by delaying mitotic exit through upregulating CDC25C

Yue Yu1, Xiao-Yan Wang1, Lei Sun2

  • 1Department of Biochemistry and Molecular Biology and.

Carcinogenesis
|March 15, 2014
PubMed

Insights

Inhibition of KIF22, a motor protein overexpressed in cancers, suppresses tumor cell proliferation. This occurs by delaying mitotic exit via increased CDC25C expression, impacting cell division.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • KIF22 is a microtubule-dependent motor protein with DNA-binding capabilities, crucial for mitosis.
  • The specific role of KIF22's altered expression and transcriptional regulation in cancer remains undefined.

Purpose of the Study:

  • To investigate the role of KIF22 overexpression in human cancer tissues.
  • To elucidate the molecular mechanisms by which KIF22 influences cancer cell proliferation and cell cycle progression.

Main Methods:

  • Analysis of KIF22 expression in human cancer tissues.
  • Inhibition of KIF22 to assess effects on cell cycle phases (G2/M) and proliferation.
  • Investigation of KIF22's transcriptional targets, including CDC25C, and its impact on CDK1 activity.

Main Results:

  • KIF22 was found to be overexpressed in human cancer tissues.
  • KIF22 inhibition caused cell cycle arrest in G2/M phases, suppressing cancer cell proliferation.
  • CDC25C was identified as a direct transcriptional target of KIF22; its inhibition led to increased CDC25C expression and CDK1 activity, delaying mitotic exit.

Conclusions:

  • KIF22 inhibition suppresses cancer cell proliferation by delaying mitotic exit.
  • This delay is mediated through the transcriptional upregulation of CDC25C.
  • KIF22 phosphorylation is essential for its transcriptional function and regulation of CDK1 activity.

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