Tumour-suppression function of KLF12 through regulation of anoikis
N Godin-Heymann1, S Brabetz1, M M Murillo1,2
1Signal Transduction, Cancer Research UK London Research Institute, London, UK.
Abstract:
Suppression of detachment-induced cell death, known as anoikis, is an essential step for cancer metastasis to occur. We report here that expression of KLF12, a member of the Kruppel-like family of transcription factors, is downregulated in lung cancer cell lines that have been selected to grow in the absence of cell adhesion. Knockdown of KLF12 in parental cells results in decreased apoptosis following cell detachment from matrix. KLF12 regulates anoikis by promoting the cell cycle transition through S phase and therefore cell proliferation. Reduced expression levels of KLF12 results in increased ability of lung cancer cells to form tumours in vivo and is associated with poorer survival in lung cancer patients. We therefore identify KLF12 as a novel metastasis-suppressor gene whose loss of function is associated with anoikis resistance through control of the cell cycle.
Insights
Loss of KLF12 in lung cancer promotes metastasis by enabling anoikis resistance. This transcription factor normally suppresses tumors by regulating cell cycle progression and proliferation, with its downregulation linked to poorer patient survival.
Area of Science:
- Molecular Biology
- Cancer Research
- Cell Biology
Background:
- Anoikis, or detachment-induced cell death, is a crucial barrier to cancer metastasis.
- Understanding the molecular mechanisms that enable cancer cells to evade anoikis is vital for developing new therapeutic strategies.
Purpose of the Study:
- To investigate the role of Kruppel-like factor 12 (KLF12) in anoikis and lung cancer metastasis.
- To determine if KLF12 acts as a tumor suppressor by regulating cell cycle progression and anoikis resistance.
Main Methods:
- Analysis of KLF12 expression in lung cancer cell lines resistant to anoikis.
- Knockdown of KLF12 in parental lung cancer cells to assess apoptosis and cell cycle progression.
- In vivo tumor formation assays and correlation analysis with patient survival data.
Main Results:
- KLF12 expression is downregulated in lung cancer cells exhibiting anoikis resistance.
- KLF12 knockdown leads to reduced apoptosis upon cell detachment and promotes cell cycle transition through S phase.
- Reduced KLF12 levels enhance tumor formation in vivo and correlate with poorer survival in lung cancer patients.
Conclusions:
- KLF12 functions as a novel metastasis suppressor gene in lung cancer.
- Loss of KLF12 function confers anoikis resistance by controlling cell cycle progression, thereby promoting metastasis and reducing patient survival.
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