We investigated this remodeling in mesenteric resistance arteries of WT or TSP1-KO mice aged to 12-16 weeks were used. An IgG2a isotype control mAb 2A3 or Ly6G-specific mAb 1A8 are used for neutrophil depletion by in vivo administration. Ligation of mesenteric resistance arteries of WT/TSP1- KO and IgG2a/neutrophil-depleted mice allowed modifying blood flow in vivo, thus exposing arteries to low (LF), normal (NF), or high flow (HF). After 7 days, arteries were isolated for in vitro study. Phenylephrine-mediated contraction and Acetylcholine-mediated relaxation were stronger in HF than in NF vessels on WT and IgG2a control mice. Any difference between HF or NF in TSP1-KO and neutrophil-depleted mice were found. Furthermore, passive diameter analysis revealed a higher diameter in HF than NF in WT and IgG2a mice. These differences are lost in TSP1-KO and neutrophil-depleted mice. These results suggest that TSP1 are essential for remodeling in mesenteric arteries by promoting neutrophils recruitment.
The author hereby declares no conflict of interest