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p55PIK transcriptionally activated by MZF1 promotes colorectal cancer cell proliferation

Yu Deng1, Jing Wang, Guihua Wang

  • 1Molecular Medical Center, Tongji Hospital, Huazhong University of Science and Technology, Wuhan 430030, China.

Biomed Research International
|March 20, 2013
PubMed

Insights

Myeloid zinc finger 1 (MZF1) activates p55PIK gene transcription, increasing cell proliferation. This MZF1-p55PIK pathway is upregulated in colorectal cancer tissues, suggesting a role in cancer progression.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • p55PIK, a regulatory subunit of phosphatidylinositol 3-kinase (PI3K), is vital for cell cycle progression and interacts with the retinoblastoma (Rb) protein.
  • Aberrant p55PIK expression is implicated in mitochondrial dysfunction during cancer progression.
  • The retinoblastoma protein's mitochondrial localization in proliferative cells highlights potential links between cell cycle regulation and organelle function.

Purpose of the Study:

  • To elucidate the transcriptional regulation mechanisms of the p55PIK gene.
  • To investigate the role of myeloid zinc finger 1 (MZF1) in p55PIK gene expression.
  • To determine the correlation between MZF1, p55PIK, and colorectal cancer cell proliferation.

Main Methods:

  • Promoter analysis to identify regulatory elements of the p55PIK gene.
  • Chromatin immunoprecipitation (ChIP) assay to confirm MZF1 binding to the p55PIK promoter.
  • Experimental manipulation of MZF1 levels (overexpression and silencing) to assess effects on p55PIK expression and cell proliferation.
  • Analysis of MZF1 and p55PIK mRNA expression in colorectal cancer (CRC) tissues.

Main Results:

  • Myeloid zinc finger 1 (MZF1) was identified as a necessary transcription factor for p55PIK gene activation.
  • MZF1 binds to the specific cis-element "TGGGGA" within the p55PIK promoter.
  • Overexpression of MZF1 led to significantly increased p55PIK promoter activity, p55PIK expression, and colorectal cancer cell proliferation.
  • Silencing of MZF1 resulted in a statistically significant decrease in p55PIK promoter activity, p55PIK expression, and cell proliferation.
  • Both MZF1 and p55PIK mRNA expression were found to be elevated in colorectal cancer tissues.
  • A strong positive correlation (Rs = 0.94) was observed between MZF1 and p55PIK mRNA levels in CRC tissues.

Conclusions:

  • p55PIK is transcriptionally activated by MZF1.
  • The MZF1-mediated activation of p55PIK contributes to increased proliferation of colorectal cancer cells.
  • This pathway represents a potential therapeutic target in colorectal cancer treatment.

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