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Lena


TIMP-1 over-expression confers resistance of MCF-7 breast cancer cells to fulvestrant
Lena Vinther1, Christina Bjerre1, Kirstine Belling2, Anne-Sofie Schrohl Rasmussen1, Jian Li3,4,
Xue Lin3,4, Zujing Han4, Jun Wang4, Lars Bolund3,4, Vibeke Jensen1, Birgitte Sander Nielsen1,
Rolf Søkilde5, Ramneek Gupta2, Ulrik Lademann1, Nils Brünner1 and Jan Stenvang1
Sino-Danish Breast Cancer Research Centre
1Faggruppen for Patobiologi, Institut for Veterinær Sygdomsbiologi, Det Biovidenskabelige Fakultet,
Københavns Universitet, Dyrlægevej 88, 1., 1870 Frederiksberg C
2 Center for Biologisk Sekvens Analyse, Institut for Systembiologi, Danmarks Tekniske Universitet, Kemitorvet,
bygning 208, 2800 Lyngby
3 Institut for Human Genetik, Aarhus Universitet, Wilhelm Meyers Allé 4, 8000 Aarhus C
4 BGI-Shenzhen, Beishan Industrial Zone, Yantian District, Shenzhen 518083, China
5 Exiqon A/S, Skelstedet 16, 2950 Vedbæk
Background:
Endocrine resistance represents a major challenge in the management of estrogen
receptor (ER) positive breast cancer. Currently no predictive biomarkers for endocrine resistance in
ER-positive breast cancer patients are in clinical use.
In a clinical study, patients with metastatic breast cancer and high levels of serum Tissue Inhibitor
of Metalloproteinases-1 (TIMP-1) had less benefit from endocrine therapy than patients with a
lower level of serum TIMP-1 [1].
Therefore, we evaluated the association between TIMP-1 and response to endocrine therapy using
an in vitro approach.
Materials and Methods: MCF-7 cells were stably transfected with pcDNA3.1(Hyg)-TIMP-1
plasmid, and a panel of subclones with different expression levels of TIMP-1 was generated. TIMP-
1 expression levels were confirmed using enzyme-linked immunosorbent assay (ELISA).
We selected four subclones with high or low TIMP-1 expression and analyzed the growth response
to estrogen, 4-hydroxytamoxifen and fulvestrant. These four subclones were analyzed for protein
expression by western blotting, genome-wide microRNA (miRNA) expression by microarray
analysis and transcriptomic changes by paired-end Solexa sequencing.
Results: High expression of TIMP-1 was associated with resistance to fulvestrant, whereas growth
response to 4-hydroxytamoxifen was independent of TIMP-1 expression levels. High expression of
TIMP-1 protein and mRNA was associated with undetectable levels of progesterone receptor (PgR)
protein and mRNA whereas ER protein and mRNA were still detected. Furthermore, TIMP-1 was
induced by estradiol. In the miRNA analysis, we identified three differentially expressed miRNAs
and one of these miRNAs appears to be of special interest to the above mentioned data.
Conclusion: Our data suggest that a high expression of TIMP-1 in vitro is associated with
resistance to fulvestrant but not to 4-hydroxytamoxifen. High expression of TIMP-1 is furthermore
associated with loss of PgR but not ER.
[1] Lipton, A et al: Serum TIMP-1 and Response to the Aromatase Inhibitor Letrozole Versus Tamoxifen in Metastatic Breast Cancer J Clin Oncol 2008; 26;(16); 2653-8

Source: http://www.bcrc.dk/6storage/1015/2/lena.pdf

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International Division 2006-07 PI Name & Institution Address Duration Total Cost (in RS.) Prof R K Somashekar, Bangalore University, Bangalore and Prof Lidia Environmental Sciences, University of Venice, VeniceSynthesis and characterization of Nano Dr VPS Awana, National Physical INT/ITALY/POC/2005-07)/BS- metals on nutrient absorbtion in plants : and Prof Franco Gamable, Rese

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