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Tamoxifen decreases...
Tamoxifen decreases extracellular TGF-beta 1 secreted from breast cancer cells - A post-translational regulation involving matrix metalloproteinase activity
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- Nilsson, Ulrika (author)
- Linköpings universitet,Onkologi,Hälsouniversitetet
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- Jönsson, Jill A. (author)
- Linköpings universitet,Onkologi,Hälsouniversitetet
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- Dabrosin, Charlotta (author)
- Östergötlands Läns Landsting,Linköpings universitet,Onkologi,Hälsouniversitetet,Onkologiska kliniken US
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(creator_code:org_t)
- Elsevier BV, 2009
- 2009
- English.
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In: Experimental Cell Research. - : Elsevier BV. - 0014-4827 .- 1090-2422. ; 315:1, s. 1-9
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Abstract
Subject headings
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- Transforming growth factor-beta 1 (TGF-beta 1) promotes cancer progression by regulating tumor cell growth and angiogenesis and high levels of TGF-beta 1 have been associated with metastatic disease and poor prognosis in breast cancer patients. We have previously reported anti-angiogenic effects of the anti-estrogen tamoxifen in breast cancer, by increased matrix metalloproteinase-9 (MMP-9) activity and generation of endostatin. Here, we show that exposure of tamoxifen to ER-positive breast cancer cells for 7 days, decreased extracellular TGF-beta 1. Intracellular TGF-beta 1 levels were unaffected by tamoxifen treatment, indicating a post-translational regulation of TGF-beta 1. Inhibition of MMP activity restored TGF-beta 1 levels, suggesting an involvement of MMP activities in the down-regulation of TGF-beta 1 by tamoxifen. Moreover, using an in vivo model of solid MCF-7 tumors in nude mice, we analyzed tumor levels of TGF-beta 1 after in vivo treatment with estradiol and tamoxifen. Exposure of tumor-bearing mice to tamoxifen significantly decreased tumor TGF-beta 1 protein levels, tumor growth and angiogenesis. In conclusion, our findings suggest a novel mechanism of action of tamoxifen in breast cancer via sex steroid dependent modulation of the proteolytic tumor microenvironment resulting in reduced extracellular TGF-beta 1 levels.
Keyword
- Sex steroids
- Breast cancer
- TGF-beta l
- MMP
- Angiogenesis
- Nude mice
- MEDICINE
- MEDICIN
Publication and Content Type
- ref (subject category)
- art (subject category)
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