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Effects of simultaneous knockdown of HER2 and PTK6 on malignancy and tumor progression in human breast cancer cells.

Mol. Cancer Res. 11, 381-392 (2013)
DOI PMC
Open Access Green as soon as Postprint is submitted to ZB.
Breast cancer is the most common malignancy in women of the Western world. One prominent feature of breast cancer is the co- and overexpression of human epidermal growth factor receptor 2 (HER2) and protein tyrosine kinase 6 (PTK6). According to the current clinical cancer therapy guidelines, HER2-overexpressing tumors are routinely treated with trastuzumab, a humanized monoclonal antibody targeting HER2. Approximately 30 % of HER2-overexpressing breast tumors at least initially respond to the anti-HER2 therapy, but a subgroup of these tumors develops resistance shortly after the administration of trastuzumab. A PTK6-targeted therapy does not yet exist. Here, we show for the first time that the simultaneous knockdown in vitro, compared with the single knockdown of HER2 and PTK6, in particular in the trastuzumab-resistant JIMT-1 cells leads to a significantly decreased phosphorylation of crucial signaling proteins: mitogen-activated protein kinase 1/3 (MAPK 1/3, ERK 1/2) and p38 MAPK, and (phosphatase and tensin homologue deleted on chromosome ten) PTEN that are involved in tumorigenesis. Additionally, dual knockdown stronger reduced the migration and invasion of the JIMT-1 cells. Moreover, the downregulation of HER2 and PTK6 led to an induction of p27 and the dual knockdown significantly diminished cell proliferation in JIMT-1 and T47D cells. In vivo experiments showed significantly reduced levels of tumor growth following HER2 or PTK6 knockdown. Our results indicate a novel strategy also for the treatment of trastuzumab resistance in tumors. Thus, the inhibition of these two signaling proteins may lead to a more effective control of breast cancer.
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Urokinase Plasminogen-activator ; Mediated Down-regulation ; Tyrosine Kinase ; Matrix Metalloproteinases ; Herceptin-resistant ; In-vitro ; Brk ; Trastuzumab ; Expression ; Apoptosis
ISSN (print) / ISBN 1541-7786
e-ISSN 1557-3125
Quellenangaben Volume: 11, Issue: 4, Pages: 381-392 Article Number: , Supplement: ,
Publisher American Association for Cancer Research (AACR)
Non-patent literature Publications
Reviewing status Peer reviewed