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p53-Independent regulation of p21Waf1/Cip1 expression and senescence by PRMT6

Sameer Phalke1, Slim Mzoughi, Marco Bezzi

  • 1Division of Cancer Genetics and Therapeutics, Institute of Molecular and Cell Biology, A*STAR (Agency for Science, Technology and Research), Singapore 138673.

Nucleic Acids Research
|September 19, 2012
PubMed

Insights

Protein arginine methyltransferase 6 (PRMT6) represses the p21 gene in breast cancer. Inhibiting PRMT6 reactivates p21, inducing cell cycle arrest and senescence, suggesting PRMT6 is an oncogene and therapeutic target.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Epigenetics

Background:

  • p21 is a key cell cycle inhibitor, inducing G1 arrest and senescence.
  • p21 is often downregulated in cancers, including breast cancer.
  • Tumor suppressors and oncogenes regulate p21 expression.

Purpose of the Study:

  • To investigate the role of PRMT6 in regulating p21 expression in breast cancer.
  • To determine if PRMT6 acts as a transcriptional repressor of p21.
  • To assess the therapeutic potential of targeting PRMT6 in breast cancer.

Main Methods:

  • PRMT6 knockdown (KD) in breast cancer cell lines.
  • Analysis of p21 promoter activity and expression.
  • Cell cycle analysis, senescence assays, and soft agar growth assays.
  • In vivo studies using severe combined immunodeficiency (SCID) mice.

Main Results:

  • PRMT6 directly represses the p21 promoter.
  • PRMT6 KD leads to p21 derepression, cell cycle arrest, and senescence.
  • This effect is independent of p53.
  • PRMT6 KD reduces tumor growth in vitro and in vivo.
  • Bypassing p21-mediated arrest rescues cells from senescence and restores growth.

Conclusions:

  • PRMT6 functions as an oncogene in breast cancer by repressing p21.
  • PRMT6 promotes cell proliferation and inhibits senescence.
  • PRMT6 is a promising therapeutic target for breast cancer treatment.

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