These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Thromboxane A2 induces blood flow recovery via platelet adhesion to ischaemic regions.
    Author: Amano H, Ito Y, Eshima K, Kato S, Ogawa F, Hosono K, Oba K, Tamaki H, Sakagami H, Shibuya M, Narumiya S, Majima M.
    Journal: Cardiovasc Res; 2015 Sep 01; 107(4):509-21. PubMed ID: 25935870.
    Abstract:
    AIMS: Thromboxane A2 (TXA2) induces platelet adhesion through thromboxane prostanoid (TP) receptor. Platelets contain many pro-angiogenic factors and are recruited to the site of vascular injury. However, the cellular and molecular mechanisms of platelet-dependent angiogenesis, especially the involvement of TP signalling, have not been fully elucidated. The present study hypothesized that TP-dependent platelet adhesion would contribute to angiogenesis in a mouse hindlimb ischaemic model. METHODS AND RESULTS: Blood flow recovery was suppressed by the TXA2 receptor antagonist (S-1452) and the TXA2 synthase inhibitor (OKY-046) compared with control mice. TP knockout mice (TP(-/-)) showed delayed blood flow recovery from ischaemia and impaired angiogenesis compared with wild-type (WT) mice and prostacyclin receptor knockout mice (IP(-/-)). Selective platelet adhesion to ischaemic endothelial cells (ECs) via P-selectin was identified in WT and IP(-/-), but not in TP(-/-), via in vivo microscopy. IF analysis showed that P-selectin glycoprotein ligand-1 (PSGL-1) co-localized with endothelial CD31 in ischaemic muscle in WT and IP(-/-) but not diminished in TP(-/-). Platelet-rich plasma levels of stromal cell-derived factor-1 and VEGF were increased after ischaemia in WT, and suppressed by antibody against P-selectin in WT but not in TP(-/-). Furthermore, the blood flow recovery was suppressed by neutralizing antibodies against VEGF or C-X-C chemokine receptor type 4 in WT and IP(-/-) but not in TP(-/-). CONCLUSION: These results indicated that TP signalling facilitates ischaemia-induced angiogenesis via P-selectin-mediated platelet adhesion to PSGL-1 on the ECs at ischaemic sites and the supply of pro-angiogenic factors by the adherent platelets.
    [Abstract] [Full Text] [Related] [New Search]