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Dysregulated selectin expression and monocyte recruitment during ischemia-related vascular remodeling in diabetes mellitus.

Arterioscler. Thromb. Vasc. Biol.2011 Nov;31(11):2526-33
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摘要


OBJECTIVE:Diabetes mellitus (DM) is associated with impaired ischemia-related vascular remodeling and also dysregulation of the inflammatory response. We sought to determine whether impaired selectin-mediated monocyte recruitment in ischemic tissues contributes to blunted ischemia-mediated angiogenesis in DM. METHODS AND RESULTS:Contrast-enhanced ultrasound perfusion imaging and molecular imaging of endothelial P-selectin expression in the proximal hindlimb were performed at 1, 3, and 21 days after arterial ligation in wild-type and db/db mice. Ligation reduced muscle blood flow to ≈0.05 mL/minute per gram in both strains. Significant recovery of flow occurred only in wild-type mice (60%-65% of baseline flow). On molecular imaging, baseline P-selectin signal was 4-fold higher in db/db compared with wild-type mice (P<0.01) but increased minimally at day 1 after ischemia, whereas signal increased approximately 10-fold in wild-type mice (P<0.01). Immunohistology of the hindlimb skeletal muscle demonstrated severely reduced monocyte recruitment in db/db mice compared with wild-type mice. Local treatment with monocyte chemotactic protein-1 corrected the deficits in postischemic P-selectin expression and monocyte recruitment in db/db mice and led to greater recovery in blood flow. CONCLUSION:In DM, there is dysregulation of the selectin response to limb ischemia, which leads to impaired monocyte recruitment, which may be mechanistically related to reduced vascular remodeling in limb ischemia.

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