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KLF4α stimulates breast cancer cell proliferation by acting as a KLF4 antagonist

Jacqueline Ferralli1, Ruth Chiquet-Ehrismann1,2, Martin Degen1,3

  • 1Friedrich Miescher Institute for Biomedical Research, Novartis Research Foundation, Basel, Switzerland.

Oncotarget
|June 22, 2016
PubMed

Insights

A newly identified KLF4α isoform in breast cancer promotes tumor growth by sequestering full-length KLF4 (KLF4(FL)) in the cytoplasm, opposing its tumor-suppressive functions.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Biology

Background:

  • Krüppel-like factor 4 (KLF4) has a dual role in cancer, acting as both a tumor suppressor and oncogene.
  • Alternative splicing of KLF4 produces isoforms, including KLF4α, which lacks a nuclear localization signal and is found in the cytoplasm.
  • The specific role of KLF4α in breast cancer and its interaction with KLF4(full-length) (KLF4(FL)) are largely unknown.

Purpose of the Study:

  • To investigate the expression and function of the KLF4α isoform in breast cancer.
  • To determine the impact of the KLF4α/KLF4(FL) ratio on breast cancer progression.
  • To elucidate the mechanism by which KLF4α influences KLF4(FL) activity.

Main Methods:

  • Analysis of KLF4α and KLF4(FL) expression in normal and tumoral breast tissues.
  • Experimental manipulation of the KLF4α/KLF4(FL) ratio in MDA-MB-231 breast cancer cells.
  • Assessment of KLF4(FL) target gene expression (E-Cadherin, p21Cip1, p27Kip1) and cell proliferation.

Main Results:

  • KLF4α is expressed in both normal and cancerous breast tissue, with an elevated KLF4α/KLF4(FL) ratio observed in tumors.
  • Increasing the KLF4α/KLF4(FL) ratio in metastatic breast cancer cells reduced levels of E-Cadherin, p21Cip1, and p27Kip1.
  • Elevated KLF4α/KLF4(FL) ratio promoted cell proliferation in breast cancer cells.

Conclusions:

  • KLF4α acts as a cytoplasmic antagonist to nuclear KLF4(FL), thereby opposing its tumor-suppressive functions.
  • The KLF4α isoform plays a significant role in breast carcinogenesis by influencing KLF4(FL) activity.
  • KLF4α represents a potential therapeutic target in breast cancer management.
Keywords:
KLF4KLF4α/KLF4(FL) ratioalternative splicingproliferationtumors

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