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  • The EMBO Journal (2006) 25, 5270 - 5283
  • doi:10.1038/sj.emboj.7601400

Published online: 2 November 2006

ADAMTS1 mediates the release of antiangiogenic polypeptides from TSP1 and 2

Nathan V Lee1, Makoto Sato2, Douglas S Annis3, Joseph A Loo4, Lily Wu2, Deane F Mosher3 and M Luisa Iruela-Arispe1

  1. Department of Molecular, Cell and Developmental Biology, Molecular Biology Institute, Jonsson Comprehensive Cancer Center, University of California, Los Angeles, CA, USA
  2. Department of Urology, Department of Molecular and Medical Pharmacology, University of California, Los Angeles, CA, USA
  3. Department of Medicine and Biomolecular Chemistry, University of Wisconsin, Madison, WI, USA
  4. Department of Biological Chemistry and Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, USA

Correspondence to:

M Luisa Iruela-Arispe, Department of Molecular, Cell and Developmental Biology, Molecular Biology Institute, UCLA, 611 Charles E. Young Drive East Boyer Hall 559, Los Angeles, CA 90095, USA. Tel.: +1 310 794 5763; Fax: +1 310 794 5766; E-mail: arispe@mbi.ucla.edu

Received 5 May 2006; Accepted 26 September 2006

Matrix metalloproteases regulate both physiological and pathological events by processing matrix proteins and growth factors. ADAMTS1 in particular is required for normal ovulation and renal function and has been shown to modulate angiogenesis. Here we report that TSP1 and 2 are substrates of ADAMTS1. Using a combination of mass spectrometry and Edman degradation, we mapped the cleavage sites and characterized the biological relevance of these processing events. ADAMTS1 cleavage mediates the release of polypeptides from the trimeric structure of both TSP1 and 2 generating a pool of antiangiogenic fragments from matrix-bound thrombospondin. Using neo-epitope antibodies we confirmed that processing occurs during wound healing of wild-type mice. However, TSP1 proteolysis is decreased or absent in ADAMTS1 null mice; this is associated with delayed wound closure and increased angiogenic response. Finally, TSP1-/- endothelial cells revealed that the antiangiogenic response mediated by ADAMTS1 is greatly dependent on TSP1. These findings have unraveled a mechanistic explanation for the angiostatic functions attributed to ADAMTS1 and demonstrated in vivo processing of TSP1 under situations of tissue repair.

  • Keywords:

    • angiogenesis,
    • extracellular matrix,
    • matrix metalloproteases,
    • thrombospondin,
    • wound healing