MENA Confers Resistance to Paclitaxel in Triple-Negative Breast Cancer

Mol Cancer Ther. 2017 Jan;16(1):143-155. doi: 10.1158/1535-7163.MCT-16-0413. Epub 2016 Nov 3.


Taxane therapy remains the standard of care for triple-negative breast cancer. However, high frequencies of recurrence and progression in treated patients indicate that metastatic breast cancer cells can acquire resistance to this drug. The actin regulatory protein MENA and particularly its invasive isoform, MENAINV, are established drivers of metastasis. MENAINV expression is significantly correlated with metastasis and poor outcome in human patients with breast cancer. We investigated whether MENA isoforms might play a role in driving resistance to chemotherapeutics. We find that both MENA and MENAINV confer resistance to the taxane paclitaxel, but not to the widely used DNA-damaging agents doxorubicin or cisplatin. Furthermore, paclitaxel treatment does not attenuate growth of MENAINV-driven metastatic lesions. Mechanistically, MENA isoform expression alters the ratio of dynamic and stable microtubule populations in paclitaxel-treated cells. MENA expression also increases MAPK signaling in response to paclitaxel treatment. Decreasing ERK phosphorylation by co-treatment with MEK inhibitor restored paclitaxel sensitivity by driving microtubule stabilization in MENA isoform-expressing cells. Our results reveal a novel mechanism of taxane resistance in highly metastatic breast cancer cells and identify a combination therapy to overcome such resistance. Mol Cancer Ther; 16(1); 143-55. ©2016 AACR.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.
  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Antineoplastic Agents, Phytogenic / pharmacology*
  • Cell Cycle / drug effects
  • Cell Cycle / genetics
  • Cell Line, Tumor
  • Cell Movement / drug effects
  • Cell Survival / drug effects
  • Disease Models, Animal
  • Drug Resistance, Neoplasm / genetics*
  • Female
  • Gene Expression*
  • Humans
  • MAP Kinase Signaling System / drug effects
  • Mice
  • Microfilament Proteins / genetics*
  • Microfilament Proteins / metabolism
  • Microtubules / metabolism
  • Neoplasm Metastasis
  • Paclitaxel / pharmacology*
  • Protein Isoforms
  • Triple Negative Breast Neoplasms / diagnosis
  • Triple Negative Breast Neoplasms / drug therapy
  • Triple Negative Breast Neoplasms / genetics*
  • Triple Negative Breast Neoplasms / metabolism
  • Tumor Burden / drug effects
  • Xenograft Model Antitumor Assays


  • Antineoplastic Agents, Phytogenic
  • Enah protein, human
  • Microfilament Proteins
  • Protein Isoforms
  • Paclitaxel