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Fibroblast nemosis arrests growth and induces differentiation of human leukemia cells

✍ Scribed by Esko Kankuri; Olga Babusikova; Kristina Hlubinova; Pertteli Salmenperä; Carla Boccaccio; Werner Lubitz; Ari Harjula; Jozef Bizik

Publisher
John Wiley and Sons
Year
2007
Tongue
French
Weight
635 KB
Volume
122
Category
Article
ISSN
0020-7136

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✦ Synopsis

Abstract

Interactive signaling between cancer cells and stroma plays an important role in determining tumor development. We recently found tumor cell‐derived factors to induce fibroblast clustering, and that the high amounts of hepatocyte growth factor/scatter factor (HGF/SF) produced by these cell–cell contact‐activated fibroblasts enhanced the invasiveness of c‐Met‐expressing cancer cells. We now observed that leukemia cells lacking c‐Met respond to this novel type of fibroblast activation, nemosis, with growth arrest and differentiation to a dendritic cell‐like phenotype. This effect was counteracted by introduction of c‐Met expression into these cells. Moreover, those leukemia cell lines harboring properly processed c‐Met showed no effect in response to nemosis. We propose this effect to be mediated by nemosis‐derived cytokine signals, and present the potential candidates induced in the nemotic fibroblasts: interleukins‐1, ‐6, ‐8, ‐11, leukemia inhibitory factor and granulocyte‐macrophage‐colony‐stimulating factor. Our results emphasize the role of activated stromal fibroblasts in controlling progression of certain hematologic malignancies in a c‐Met expression‐dependent manner. © 2007 Wiley‐Liss, Inc.

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