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Area of Science:

  • Vascular Biology
  • Immunology

Background:

  • Mast cells are implicated in arteriogenesis and collateral formation.
  • Mast cells colocalize with neovessels in atherosclerotic plaques and tumor vascularization.

Purpose of the Study:

  • To investigate the role of mast cells in promoting angiogenesis and arteriogenesis during ischemia.
  • To determine if mast cell activation enhances blood flow and vascularization in ischemic tissue.

Main Methods:

  • Observation of activated mast cells in human ischemic muscle tissue.
  • Induction of hind limb ischemia in C57Bl/6 mice with local mast cell activation.
  • Flow cytometry to analyze inflammatory monocytes.
  • Histological analysis of collateral and capillary formation.
  • Blood flow measurement in hind limbs.

Main Results:

  • Activated mast cells were found around capillaries in human ischemic muscle.
  • Mast cell activation increased in mouse ischemic muscles up to 10 days post-induction.
  • Local mast cell activation significantly increased hind limb blood flow (46% at day 9).
  • Mast cell activation enhanced collateral diameter and CD31+ capillary numbers, but not collateral count.

Conclusions:

  • Locally activated mast cells contribute to both arteriogenesis and angiogenesis.
  • Mast cells play a crucial role in the vascularization process during ischemia.