Volume 105, Issue 2 pp. 402-411

Expression of matrix metalloproteinases (MMP-2 and -9) and tissue inhibitors of metalloproteinases (TIMP-1 and -2) in acute myelogenous leukaemia blasts: comparison with normal bone marrow cells

Anna Janowska-Wieczorek

Anna Janowska-Wieczorek

Department of Medicine, University of Alberta, Edmonton,

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Leah Marquez

Leah Marquez

Department of Medicine, University of Alberta, Edmonton,

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Akinobu Matsuzaki

Akinobu Matsuzaki

Department of Medicine, University of Alberta, Edmonton,

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Haroon Hashmi

Haroon Hashmi

Department of Medicine, University of Alberta, Edmonton,

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Lori Larratt

Lori Larratt

Department of Medicine, University of Alberta, Edmonton,

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Lynn Boshkov

Lynn Boshkov

Department of Medicine, University of Alberta, Edmonton,

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A. Turner

A. Turner

Department of Medicine, University of Alberta, Edmonton,

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Melissa Zhang

Melissa Zhang

Department of Pathology, University of Calgary, Alberta, Canada,

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Dylan Edwards

Dylan Edwards

Department of Biological Sciences, University of East Anglia, Norwich, U.K.

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Anna Kossakowska

Anna Kossakowska

Department of Pathology, University of Calgary, Alberta, Canada,

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First published: 17 February 2005
Citations: 82
Dr Anna Janowska-Wieczorek Department of Medicine, University of Alberta, Canadian Blood Services, Edmonton Centre, 8249–114 Street, Edmonton, Alberta, Canada T6G 2R8.

Abstract

We compared the expression of matrix metalloproteinases (MMP-2 and MMP-9) and tissue inhibitors of metalloproteinases (TIMP-1 and TIMP-2) in bone marrow acute myelogenous leukaemia (AML) blasts and leukaemic cell lines (HEL, HL-60, K-562 and KG-1) with their expression in normal bone marrow cells. All AML samples and leukaemic cell lines tested expressed MMP-9 and/or MMP-2 mRNA and, accordingly, these gelatinases were secreted into media. Moreover, TIMP-1 and TIMP-2 mRNA and secreted proteins were demonstrated in all the AML samples. Although all the leukaemic cell lines expressed TIMP-1, the HL-60 cells also expressed TIMP-2. In contrast, normal steady-state bone marrow immature progenitor cells (CD34+ cells) did not express or secrete either MMP-2 or MMP-9, but more mature mononuclear cells from normal bone marrow expressed and secreted MMP-9. Also, normal bone marrow CD34+ cells and mononuclear cells expressed TIMP-1 and TIMP-2 mRNA, but these proteins were not detectable by reverse zymography. Furthermore, whereas bone marrow fibroblasts and endothelial cells secreted only latent MMP-2, the activated form of this enzyme was found in media conditioned by cells obtained from long-term cultures of normal and AML bone marrow adherent layers. Our finding of up-regulated production of gelatinases, TIMP-1 and TIMP-2 by leukaemic cells suggests that these proteins may be implicated in the invasive phenotype of AML.

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