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Bone cell matrix promotes the adhesion of human prostatic carcinoma cells via the α2β1 integrin

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Abstract

Prostatic carcinoma cells have a propensity to metastasize to bone, and we propose that this phenomenon may be promoted by the adhesion of metastatic cells to bone matrix. Bone matrix is produced by osteoblasts, and we have developed an in vitro model of bone matrix by isolating the substratum deposited by human osteoblast-like U20S cells. The collagenous nature of this matrix was demonstrated by the incorporation of [3H]proline and its subsequent release by purified collagenase. Both U20S matrix and purified type I collagen stimulated the adhesion of human PC-3 prostatic carcinoma cells. Human laminin supported adhesion to a much lesser extent, and PC-3 cells did not adhere to fibronectin. Adhesion of PC-3 cells to U20S matrix closely resembled adhesion to purified type I collagen with respect to (a) inhibition by a collagen-derived peptide and by antibodies raised against α2 or β1 integrin collagen receptor subunits; (b) lack of inhibition by RGD (Arg-Gly-Asp) peptides; (c) stimulation by Mn2+ and Mg2+ ions but not by Ca2+ ion; and (d) stimulation by the phorbol ester PMA (phorbol 12-myristate 13-acetate). This adhesion was also stimulated (2.3-fold) by transforming growth factor β (TGF-β), which is a major bone-derived growth factor. We conclude that human osteoblast-like matrix is an adhesive substrate for PC-3 prostate carcinoma cells. This adhesion appears to be mediated by the interaction of α2β1 integrins on PC-3 cells with matrix-derived collagen. The stimulation of this adhesion by TGF-β suggests that the co-expression of TGF-β and type I collagen in bone may synergistically facilitate the adhesion of metastatic cells to bone matrix proteins and thereby increase their localization in the skeleton.

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Authors and Affiliations

  1. Hamilton Regional Cancer Center, Hamilton, Ontario, Canada

    Paul J. Kostenuik, Otto Sanchez-Sweatman, F. William Orr & Gurmit Singh

  2. Department of Pathology, University of Manitoba, Winnipeg, Manitoba, USA

    F. William Orr

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  1. Paul J. Kostenuik
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  2. Otto Sanchez-Sweatman
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  3. F. William Orr
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  4. Gurmit Singh
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Kostenuik, P.J., Sanchez-Sweatman, O., Orr, F.W. et al. Bone cell matrix promotes the adhesion of human prostatic carcinoma cells via the α2β1 integrin. Clin Exp Metast 14, 19–26 (1996). https://doi.org/10.1007/BF00157682

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  • DOI: https://doi.org/10.1007/BF00157682

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