title: Sphingosine 1-phosphate receptor 3 regulates recruitment of anti-inflammatory monocytes to microvessels during implant arteriogenesis.
abstract: Endothelial cells play significant roles in conditioning tissues after injury by the production and secretion of angiocrine factors. At least two distinct subsets of monocytes, CD45(+)CD11b(+)Gr1(+)Ly6C(+) inflammatory and CD45(+)CD11b(+)Gr1(-)Ly6C(-) anti-inflammatory monocytes, respond differentially to these angiocrine factors and promote pathogen/debris clearance and arteriogenesis/tissue regeneration, respectively. We demonstrate here that local sphingosine 1-phosphate receptor 3 (S1P3) agonism recruits anti-inflammatory monocytes to remodeling vessels. Poly(lactic-co-glycolic acid) thin films were used to deliver FTY720, an S1P1/3 agonist, to inflamed and ischemic tissues, which resulted in a reduction in proinflammatory cytokine secretion and an increase in regenerative cytokine secretion. The altered balance of cytokine secretion results in preferential recruitment of anti-inflammatory monocytes from circulation. The chemotaxis of these cells, which express more S1P3 than inflammatory monocytes, toward SDF-1α was also enhanced with FTY720 treatment, but not in S1P3 knockout cells. FTY720 delivery enhanced arteriolar diameter expansion and increased length density of the local vasculature. This work establishes a role for S1P receptor signaling in the local conditioning of tissues by angiocrine factors that preferentially recruit regenerative monocytes that can enhance healing outcomes, tissue regeneration, and biomaterial implant functionality.
authors.affiliation: Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
authors.forename: Anthony O
authors.initials: AO
authors.lastname: Awojoodu
authors.forename: Molly E
authors.initials: ME
authors.lastname: Ogle
authors.forename: Lauren S
authors.initials: LS
authors.lastname: Sefcik
authors.forename: Daniel T
authors.initials: DT
authors.lastname: Bowers
authors.forename: Kyle
authors.initials: K
authors.lastname: Martin
authors.forename: Kenneth L
authors.initials: KL
authors.lastname: Brayman
authors.forename: Kevin R
authors.initials: KR
authors.lastname: Lynch
authors.forename: Shayn M
authors.initials: SM
authors.lastname: Peirce-Cottler
authors.forename: Edward
authors.initials: E
authors.lastname: Botchwey
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D015153:Blotting, Western; D002478:Cells, Cultured; D002633:Chemotaxis / Q000187:drug effects; D016207:Cytokines / Q000378:metabolism; D017931:DNA Primers / Q000235:genetics; D004337:Drug Carriers; D000068876:Fingolimod Hydrochloride; D005434:Flow Cytometry; D006801:Humans; D007150:Immunohistochemistry; D019344:Lactic Acid; D051379:Mice; D008810:Mice, Inbred C57BL; D018613:Microscopy, Confocal; D055806:Microvessels / Q000166:cytology; D009000:Monocytes / Q000187:drug effects / Q000502:physiology*; D018919:Neovascularization, Physiologic / Q000187:drug effects / Q000502:physiology*; D011100:Polyglycolic Acid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011409:Propylene Glycols / Q000008:administration & dosage / Q000494:pharmacology*; D019736:Prostheses and Implants / Q000009:adverse effects*; D060888:Real-Time Polymerase Chain Reaction; D049349:Receptors, Lysosphingolipid / Q000819:agonists / Q000378:metabolism*; D013110:Sphingosine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000494:pharmacology; D023822:Tissue Engineering / Q000379:methods*; D057772:Vascular System Injuries / Q000188:drug therapy* / Q000209:etiology
chemical_list: D016207:Cytokines; D017931:DNA Primers; D004337:Drug Carriers; D011409:Propylene Glycols; D049349:Receptors, Lysosphingolipid; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; D000068876:Fingolimod Hydrochloride; D013110:Sphingosine
keywords: biomaterials; immunomodulation; microvascular remodeling; sphingolipid; tissue engineering
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