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Article

TGF-β autocrine pathway and MAPK signaling promote cell invasiveness and in vivo mammary adenocarcinoma tumor progression

  • Authors:
    • María Cecilia Daroqui
    • Paula Vazquez
    • Elisa Bal de Kier Joffé
    • Andrei V. Bakin
    • Lydia I. Puricelli
  • View Affiliations / Copyright

    Affiliations: Department of Oncology, Montefiore Medical Center, Bronx, NY 10467, USA, Research Area, Institute of Oncology ‘Ángel H. Roffo’, 1417 Buenos Aires, Argentina, Department of Cancer Genetics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA
  • Pages: 567-575
    |
    Published online on: May 14, 2012
       https://doi.org/10.3892/or.2012.1813
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Abstract

Breast cancer progression and metastasis have been linked to abnormal signaling by transforming growth factor-β (TGF-β) cytokines. In early-stage breast cancers, TGF-β exhibits tumor suppressor activity by repressing cell proliferation and inducing cell death, whereas in advanced-stage tumors, TGF-β promotes invasion and metastatic dissemination. The molecular mechanisms underlying pro-oncogenic activities of TGF-β are not fully understood. The present study validates the role of TGF-β signaling in cancer progression and explores mediators of pro-oncogenic TGF-β activities using the LM3 mammary adenocarcinoma cell line, derived from a spontaneous murine mammary adenocarcinoma. Expression of kinase-inactive TGF-β receptors decreased both basal and TGF-β-induced invasion. Analysis of signal transduction mediators showed that p38MAPK and MEK contribute to TGF-β stimulation of cell motility and invasion. TGF-β disrupted the epithelial actin structures supporting cell-cell adhesions, and increased linear actin filaments. Moreover, MEK and p38MAPK pathways showed opposite effects on actin remodeling in response to TGF-β. Blockade of Raf-MEK signaling enhanced TGF-β induction of actin stress-fibers whereas p38MAPK inhibitors blocked this effect. A novel observation was made that TGF-β rapidly activates the actin nucleation Arp2/3 complex. In addition, TGF-β stimulated matrix metalloproteinase MMP-9 secretion via a MAPK-independent pathway. Experiments using syngeneic mice showed that kinase-inactive TGF-β receptors inhibit the first stages of LM3 tumor growth in vivo. Our studies demonstrate that autocrine TGF-β signaling contributes to the invasive behavior of mammary carcinoma cells. Moreover, we show that both MAPK-dependent and -independent pathways are necessary for TGF-β-induced effects. Therefore, MEK-ERK and p38 MAPK pathways are potential venues for therapeutic intervention in pro-oncogenic TGF-β signaling.
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Copy and paste a formatted citation
Spandidos Publications style
Daroqui MC, Vazquez P, Bal de Kier Joffé E, Bakin AV and Puricelli LI: TGF-β autocrine pathway and MAPK signaling promote cell invasiveness and in vivo mammary adenocarcinoma tumor progression. Oncol Rep 28: 567-575, 2012.
APA
Daroqui, M.C., Vazquez, P., Bal de Kier Joffé, E., Bakin, A.V., & Puricelli, L.I. (2012). TGF-β autocrine pathway and MAPK signaling promote cell invasiveness and in vivo mammary adenocarcinoma tumor progression. Oncology Reports, 28, 567-575. https://doi.org/10.3892/or.2012.1813
MLA
Daroqui, M. C., Vazquez, P., Bal de Kier Joffé, E., Bakin, A. V., Puricelli, L. I."TGF-β autocrine pathway and MAPK signaling promote cell invasiveness and in vivo mammary adenocarcinoma tumor progression". Oncology Reports 28.2 (2012): 567-575.
Chicago
Daroqui, M. C., Vazquez, P., Bal de Kier Joffé, E., Bakin, A. V., Puricelli, L. I."TGF-β autocrine pathway and MAPK signaling promote cell invasiveness and in vivo mammary adenocarcinoma tumor progression". Oncology Reports 28, no. 2 (2012): 567-575. https://doi.org/10.3892/or.2012.1813
Copy and paste a formatted citation
x
Spandidos Publications style
Daroqui MC, Vazquez P, Bal de Kier Joffé E, Bakin AV and Puricelli LI: TGF-β autocrine pathway and MAPK signaling promote cell invasiveness and in vivo mammary adenocarcinoma tumor progression. Oncol Rep 28: 567-575, 2012.
APA
Daroqui, M.C., Vazquez, P., Bal de Kier Joffé, E., Bakin, A.V., & Puricelli, L.I. (2012). TGF-β autocrine pathway and MAPK signaling promote cell invasiveness and in vivo mammary adenocarcinoma tumor progression. Oncology Reports, 28, 567-575. https://doi.org/10.3892/or.2012.1813
MLA
Daroqui, M. C., Vazquez, P., Bal de Kier Joffé, E., Bakin, A. V., Puricelli, L. I."TGF-β autocrine pathway and MAPK signaling promote cell invasiveness and in vivo mammary adenocarcinoma tumor progression". Oncology Reports 28.2 (2012): 567-575.
Chicago
Daroqui, M. C., Vazquez, P., Bal de Kier Joffé, E., Bakin, A. V., Puricelli, L. I."TGF-β autocrine pathway and MAPK signaling promote cell invasiveness and in vivo mammary adenocarcinoma tumor progression". Oncology Reports 28, no. 2 (2012): 567-575. https://doi.org/10.3892/or.2012.1813
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