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Clinical & Experimental Metastasis

, Volume 30, Issue 1, pp 13–23 | Cite as

Expression of TGFβ3 and its effects on migratory and invasive behavior of prostate cancer cells: involvement of PI3-kinase/AKT signaling pathway

  • Lindsey Walker
  • Ana C. Millena
  • Nicole Strong
  • Shafiq A. Khan
Research Paper

Abstract

Transforming growth factor-β (TGFβ) is a secreted cytokine implicated as a factor in cancer cell migration and invasion. Previous studies have indicated that TGFβ isoforms may exert differential effects on cancer cells during different stages of the disease, however very little is known about the expression patterns and activity of the three isoforms in prostate cancer. Non-traditional signaling pathways including the PI3-Kinase have been associated with TGFβ-mediated effects on cancer cell invasion. In the present study, we have carried out expression analysis of TGFβ isoforms and signaling components in cell line models representing different stages of prostate cancer and studied the differential effects of specific isoforms on migratory and invasive behavior and induction of the PI3-kinase pathway. TGFβ1 and TGFβ3 were expressed in all cell lines, with TGFβ3 expression increasing in metastatic cell lines. Both TGFβ1 and TGFβ3 induced motility and invasive behavior in PC3 cells, however, TGFβ3 was significantly more potent than TGFβ1. TGFβRI and Smad3 inhibitors blocked TGFβ1 and TGFβ3 induced motility and invasion. TGFβ3 caused a significant increase in pAKTser473 in PC3 cells and PI3-kinase inhibitor LY294002 blocked TGFβ3 induced migration, invasion and phosphorylation of AKT. Both TGFβRI and Smad3 inhibitors blocked TGFβ3 induced pAKTser473. Based on these results, we conclude that TGFβ3 is expressed in metastatic prostate cancer cell lines and is involved in induction of invasive behavior in these cells. Furthermore, these effects of TGFβ3 are TGFβRI and Smad3 dependent and mediated via the PI3-kinase pathway.

Keywords

Invasion Migration PI3-kinase/AKT Prostate cancer Metastasis TGFβ isoforms 

Notes

Acknowledgments

These studies were supported by the NIH/NCRR/RCMI grant #2G12RR003062, NIH P20 grant #5P20MD002285 and DOD Grant # W8I-08-1-0077.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Lindsey Walker
    • 1
  • Ana C. Millena
    • 1
  • Nicole Strong
    • 1
  • Shafiq A. Khan
    • 1
  1. 1.Center for Cancer Research and Therapeutic DevelopmentClark Atlanta UniversitySW AtlantaUSA

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