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Published in: Tumor Biology 2/2013

01-04-2013 | Research Article

TIMP-1 overexpression does not affect sensitivity to HER2-targeting drugs in the HER2-gene-amplified SK-BR-3 human breast cancer cell line

Authors: Xiaohong Deng, Louise Fogh, Ulrik Lademann, Vibeke Jensen, Jan Stenvang, Huanming Yang, Nils Brünner, Anne-Sofie Schrohl

Published in: Tumor Biology | Issue 2/2013

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Abstract

Tissue inhibitor of metalloproteinases-1 (TIMP-1) has been suggested as a marker of prognosis and response to treatment in breast cancer. In vitro, TIMP-1 can regulate shedding of the extracellular domain of HER2 and signalling via the Akt pathway, and we hypothesize that TIMP-1 therefore can affect sensitivity to the HER2-targeting drugs trastuzumab and lapatinib. SK-BR-3 human breast cancer cells were stably transfected with TIMP-1, characterized with regard to TIMP-1 protein expression, proliferation, and functionality of the secreted TIMP-1, and the sensitivity to trastuzumab and lapatinib was studied in five selected single-cell subclones expressing TIMP-1 protein at various levels plus the parental SK-BR-3 cell line. Both trastuzumab and lapatinib reduced cell viability, as determined by MTT assay, but the sensitivity to the drugs was not associated with the expression level of TIMP-1 protein. Western blotting showed that the activation of Akt, PTEN, and HER2 as well as ADAM10 was similar in all clones. In conclusion, in this model, TIMP-1 overexpression does not affect HER2 cleavage by ADAM10 or signalling via the Akt pathway, and TIMP-1 does not influence sensitivity to trastuzumab and lapatinib.
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Metadata
Title
TIMP-1 overexpression does not affect sensitivity to HER2-targeting drugs in the HER2-gene-amplified SK-BR-3 human breast cancer cell line
Authors
Xiaohong Deng
Louise Fogh
Ulrik Lademann
Vibeke Jensen
Jan Stenvang
Huanming Yang
Nils Brünner
Anne-Sofie Schrohl
Publication date
01-04-2013
Publisher
Springer Netherlands
Published in
Tumor Biology / Issue 2/2013
Print ISSN: 1010-4283
Electronic ISSN: 1423-0380
DOI
https://doi.org/10.1007/s13277-013-0659-5

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