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Inflammation induced by mmp-9 enhances tumor regression of experimental breast cancer
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2013 (English)In: Journal of Immunology, ISSN 0022-1767, E-ISSN 1550-6606, Vol. 190, no 8, 4420-4430 p.Article in journal (Refereed) Published
Abstract [en]

Matrix metalloproteinases (MMPs) have been suggested as therapeutic targets in cancer treatment, but broad-spectrum MMP inhibitors have failed in clinical trials. Recent data suggest that several MMPs including MMP-9 exert both pro- and antitumorigenic properties. This is also the case of the natural inhibitors of MMPs, tissue inhibitor of metalloproteinases (TIMPs). The inhibitor of MMP-9 is TIMP-1, and high levels of this enzyme have been associated with decreased survival in breast cancer. Inflammation is one hallmark of cancer progression, and MMPs/TIMPs may be involved in the local immune regulation. We investigated the role of MMP-9/TIMP-1 in regulating innate antitumor immunity in breast cancer. Breast cancers were established in nude mice and treated with intratumoral injections of adenoviruses carrying the human TIMP-1 or MMP-9 gene (AdMMP-9). In vivo microdialysis for sampling of cancer cell-derived (human) and stroma-derived (murine) proteins, immunostainings, as well as cell cultures were performed. We report a dose-dependent decrease of tumor growth and angiogenesis after AdMMP-9 treatment. In addition to increased generation of endostatin, AdMMP-9 promoted an antitumor immune response by inducing massive neutrophil infiltration. Neutrophil depletion prior to gene transfer abolished the therapeutic effects of AdMMP-9. Additionally, AdMMP-9 activated tumor-infiltrating macrophages into a tumor-inhibiting phenotype both in vivo and in vitro. AdMMP-9 also inhibited tumor growth in immune-competent mice bearing breast cancers. Adenoviruses carrying the human TIMP-1 gene had no effect on tumor growth or the immune response. Our novel data identify MMP-9 as a potent player in modulating the innate immune response into antitumor activities.

Place, publisher, year, edition, pages
2013. Vol. 190, no 8, 4420-4430 p.
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-198287DOI: 10.4049/jimmunol.1202610ISI: 000317274500059PubMedID: 23509357OAI: oai:DiVA.org:uu-198287DiVA: diva2:615657
Available from: 2013-04-11 Created: 2013-04-11 Last updated: 2014-05-22Bibliographically approved

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Olsson, Anna-Karin
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Department of Medical Biochemistry and Microbiology
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