Tissue type plasminogen activator regulates myeloid-cell dependent neoangiogenesis during tissue regeneration

Research output: Contribution to journalJournal articleResearchpeer-review

  • Makiko Ohki
  • Yuichi Ohki
  • Makoto Ishihara
  • Chiemi Nishida
  • Yoshihiko Tashiro
  • Haruyo Akiyama
  • Hiromitsu Komiyama
  • Leif R Lund
  • Atsumi Nitta
  • Kiyofumi Yamada
  • Zhenping Zhu
  • Hideoki Ogawa
  • Hideo Yagita
  • Ko Okumura
  • Hiromitsu Nakauchi
  • Zena Werb
  • Beate Heissig
  • Koichi Hattori
Ischemia of the heart, brain, and limbs is a leading cause of morbidity and mortality worldwide. Treatment with tissue type plasminogen activator (tPA) can dissolve blood clots and can ameliorate the clinical outcome in ischemic diseases. But the underlying mechanism by which tPA improves ischemic tissue regeneration is not well understood. Bone marrow (BM)-derived myeloid cells facilitate angiogenesis during tissue regeneration. Here, we report that a serpin-resistant form of tPA by activating the extracellular proteases matrix metalloproteinase-9 and plasmin expands the myeloid cell pool and mobilizes CD45(+)CD11b(+) proangiogenic, myeloid cells, a process dependent on vascular endothelial growth factor-A (VEGF-A) and Kit ligand signaling. tPA improves the incorporation of CD11b(+) cells into ischemic tissues and increases expression of neoangiogenesis-related genes, including VEGF-A. Remarkably, transplantation of BM-derived tPA-mobilized CD11b(+) cells and VEGFR-1(+) cells, but not carrier-mobilized cells or CD11b(-) cells, accelerates neovascularization and ischemic tissue regeneration. Inhibition of VEGF signaling suppresses tPA-induced neovascularization in a model of hind limb ischemia. Thus, tPA mobilizes CD11b(+) cells from the BM and increases systemic and local (cellular) VEGF-A, which can locally promote angiogenesis during ischemic recovery. tPA might be useful to induce therapeutic revascularization in the growing field of regenerative medicine.
Original languageEnglish
JournalBlood
Volume115
Issue number21
Pages (from-to)4302-12
Number of pages10
ISSN0006-4971
DOIs
Publication statusPublished - 2010

Bibliographical note

Keywords: Animals; Antigens, CD11b; Base Sequence; Bone Marrow Transplantation; DNA Primers; Female; Gene Expression; Ischemia; Male; Matrix Metalloproteinase 9; Mice; Mice, Inbred C57BL; Mice, Knockout; Mice, Transgenic; Mutant Proteins; Myeloid Cells; Neovascularization, Physiologic; Plasminogen; Recombinant Proteins; Regeneration; Signal Transduction; Stem Cell Factor; Tissue Plasminogen Activator; Transplantation Chimera; Vascular Endothelial Growth Factor A; Vascular Endothelial Growth Factor Receptor-1

ID: 20853158