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Das, Arundhati; Smith, Randall J; Andreadis, Stelios T
Cardiovascular research, 07/2024, Volume: 120, Issue: 8Journal Article
Cell-free tissue-engineered vascular grafts provide a promising alternative to treat cardiovascular disease but timely endothelialization is essential for ensuring patency and proper functioning post-implantation. Recent studies from our lab showed that blood cells like monocytes (MCs) and macrophages (Mφ) may contribute directly to cellularization and regeneration of bioengineered arteries in small and large animal models. While MCs and Mφ are leukocytes that are part of the innate immune response, they share common developmental origins with endothelial cells (ECs) and are known to play crucial roles during vessel formation (angiogenesis) and vessel repair after inflammation/injury. They are highly plastic cells that polarize into proinflammatory and anti-inflammatory phenotypes upon exposure to cytokines; and differentiate into other cell types, including EC-like cells, in the presence of appropriate chemical and mechanical stimuli. This review focuses on the developmental origins of MCs and ECs; the role of MCs and Mφ in vessel repair/regeneration during inflammation/injury; and the role of chemical signaling and mechanical forces in Mφ inflammation that mediates vascular graft regeneration. We postulate that comprehensive understanding of these mechanisms will better inform the development of strategies to coax MCs/Mφ into endothelializing the lumen and regenerate the smooth muscle layers of cell-free bioengineered arteries and veins that are designed to treat cardiovascular diseases and perhaps the native vasculature as well.
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