TY - JOUR
T1 - Differential Tks5 isoform expression contributes to metastatic invasion of lung adenocarcinoma
AU - Li, Carman Man Chung
AU - Chen, Guoan
AU - Dayton, Talya L.
AU - Kim-Kiselak, Caroline
AU - Hoersch, Sebastian
AU - Whittaker, Charles A.
AU - Bronson, Roderick T.
AU - Beer, David G.
AU - Winslow, Monte M.
AU - Jacks, Tyler
PY - 2013/7/15
Y1 - 2013/7/15
N2 - Metastasis accounts for the vast majority of cancer-related deaths, yet the molecular mechanisms that drive metastatic spread remain poorly understood. Here we report that Tks5, which has been linked to the formation of proteolytic cellular protrusions known as invadopodia, undergoes an isoform switch during metastatic progression in a genetically engineered mouse model of lung adenocarcinoma. Nonmetastatic primary tumor-derived cells predominantly expressed a short isoform, Tks5short, while metastatic primary tumor- and metastasis-derived cells acquired increased expression of the full-length isoform Tks5long. This elevation of Tks5long to Tks5short ratio correlated with a commensurate increase in invadopodia activity in metastatic cells compared with nonmetastatic cells. Further characterization of these isoforms by knockdown and overexpression experiments demonstrated that Tks5long promoted invadopodia in vitro and increased metastasis in transplant models and an autochthonous model of lung adenocarcinoma. Conversely, Tks5short decreased invadopodia stability and proteolysis, acting as a natural dominant-negative inhibitor to Tks5long. Importantly, high Tks5long and low Tks5short expressions in human lung adenocarcinomas correlated with metastatic disease and predicted worse survival of early stage patients. These data indicate that tipping the Tks5 isoform balance to a high Tks5long to Tks5short ratio promotes invadopodia-mediated invasion and metastasis.
AB - Metastasis accounts for the vast majority of cancer-related deaths, yet the molecular mechanisms that drive metastatic spread remain poorly understood. Here we report that Tks5, which has been linked to the formation of proteolytic cellular protrusions known as invadopodia, undergoes an isoform switch during metastatic progression in a genetically engineered mouse model of lung adenocarcinoma. Nonmetastatic primary tumor-derived cells predominantly expressed a short isoform, Tks5short, while metastatic primary tumor- and metastasis-derived cells acquired increased expression of the full-length isoform Tks5long. This elevation of Tks5long to Tks5short ratio correlated with a commensurate increase in invadopodia activity in metastatic cells compared with nonmetastatic cells. Further characterization of these isoforms by knockdown and overexpression experiments demonstrated that Tks5long promoted invadopodia in vitro and increased metastasis in transplant models and an autochthonous model of lung adenocarcinoma. Conversely, Tks5short decreased invadopodia stability and proteolysis, acting as a natural dominant-negative inhibitor to Tks5long. Importantly, high Tks5long and low Tks5short expressions in human lung adenocarcinomas correlated with metastatic disease and predicted worse survival of early stage patients. These data indicate that tipping the Tks5 isoform balance to a high Tks5long to Tks5short ratio promotes invadopodia-mediated invasion and metastasis.
KW - Invadopodia
KW - Lung adenocarcinoma
KW - Metastasis
KW - Mouse model
KW - Non-small-cell lung cancer
KW - Tks5
UR - http://www.scopus.com/inward/record.url?scp=84880397128&partnerID=8YFLogxK
U2 - 10.1101/gad.222745.113
DO - 10.1101/gad.222745.113
M3 - Article
C2 - 23873940
AN - SCOPUS:84880397128
SN - 0890-9369
VL - 27
SP - 1557
EP - 1567
JO - Genes and Development
JF - Genes and Development
IS - 14
ER -