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Proangiogenic cells enhanced persistent and physiologic neovascularization compared with macrophages.

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Proangiogenic cells (PACs) promote healthier new blood vessel growth than myelomonocytic cells (Macs) in ischemic conditions. PACs enhance long-term neovascularization, while Macs lead to abnormal vessel development.

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Area of Science:

  • Regenerative Medicine
  • Vascular Biology
  • Cell Therapy

Background:

  • Proangiogenic cells (PACs) share similarities with myelomonocytic cells (Macs) but exhibit distinct neovascularization capabilities.
  • Understanding these differences is crucial for developing effective cell-based therapies for ischemic diseases.

Purpose of the Study:

  • To compare the neovascularization activities of PACs and CD14(+)-derived macrophages (Macs).
  • To evaluate the therapeutic potential of PACs versus Macs in experimental models of angiogenesis and hindlimb ischemia.

Main Methods:

  • Cultured PACs and Macs, analyzed surface markers and cytokines.
  • Assessed mesenchymal stem cell (MSC) transmigration and in vitro/in vivo angiogenesis models.
  • Evaluated neovascularization and perfusion recovery in a mouse hindlimb ischemia model.
  • Utilized a suicidal gene system to assess the in vivo contribution of transplanted cells.

Main Results:

  • PACs and Macs exhibited similar surface markers and cytokines, with exceptions like KDR and IL-8.
  • PACs significantly enhanced MSC transmigration compared to Macs.
  • Both cell types promoted neovascularization in vitro and in vivo, but Macs induced leaky vessels.
  • PACs demonstrated superior perfusion recovery in hindlimb ischemia, which was abrogated upon cell depletion, unlike Macs.

Conclusions:

  • PACs promote the formation of healthy new vessels and enhance long-term functional neovascularization.
  • Macs did not yield similar long-term benefits and resulted in aberrant vascularization.
  • Further validation of angiogenic potential and safety is necessary for therapeutic applications.