Journal
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
Volume 105, Issue 9, Pages 2562-2571Publisher
WILEY
DOI: 10.1002/jbm.a.36113
Keywords
polydioxanone; galectin-1; macrophage; immunomodulation
Funding
- Department of Veterans Affairs Interprofessional Polytrauma and Traumatic Brain Injury Rehabilitation Research Fellowship
- National Institutes for Health [R01 AI101153/AI/NIAID, R01 AI059638/AI/NIAD]
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Regulating soft tissue repair to prevent fibrosis and promote regeneration is central to creating a micro-environment conducive to soft tissue development. Macrophages play an important role in this process. The macrophage response can be modulated using biomaterials, altering cytokine and growth factor secretion to promote regeneration. Electrospun polydioxanone (PDO) fiber scaffolds promoted an M2 phenotype when macrophages were cultured on large diameter, highly porous scaffolds, but an M1 phenotype on smaller diameter fibers. In this study, we investigated whether incorporation of galectin-1, an immunosuppressive protein that enhances muscle regeneration, could promote the M2 response. Galectin-1 was incorporated into large and small fiber PDO scaffolds during electrospinning. Galectin-1 incorporation increased arginase-1 and reduced iNOS and IL-6 production in mouse bone-marrow derived macrophages compared with PDO alone for both scaffold types. Inhibition of ERK mitogen-activated protein kinase did not alter galectin-1 effects on arginase-1 and iNOS expression, but reversed IL-6 suppression, indicating that IL-6 is mediated by a different mechanism. Our results suggest that galectin-1 can be used to modulate macrophage commitment to a pro-regenerative M2 phenotype, which may positively impact tissue regeneration when using small diameter PDO scaffolds. (C) 2017 Wiley Periodicals,
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