Abstract
The interaction of immune cells with biomaterials has been identified as a possible predictor of either the success or the failure of the implant. Among immune cells, macrophages have been found to contribute to both of these possible scenarios, based on their polarization profile. This proof-of-concept study aimed to investigate if it was possible to affect the response of macrophages to biomaterials, by the release of anti-inflammatory mediators. Towards this end, a collagen scaffold, integrated with poly(lactic-co-glycolic acid)—multistage silicon particles (MSV) composite microspheres (PLGA-MSV) releasing IL-4 was developed (PLGA-MSV/IL-4). Macrophages’ response to the scaffold was evaluated, both in vitro with rat bone-marrow derived macrophages, and in vivo in a rat subcutaneous pouch model. In vitro experiments revealed an overexpression of anti-inflammatory associated genes (Il-10, Mrc1, Arg1) at as soon as 48 h. The analysis of the cells that infiltrated the scaffold, revealed a prevalence of CD206+ macrophages at 24 h. Our strategy demonstrated that it is possible to tune the in vivo early response to biomaterials by the release of an anti-inflammatory cytokine, and that could contribute to accelerate the resolution of the inflammatory phase, benefiting a vast range of tissue engineering applications.
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Abbreviations
- BMDM:
-
Bone marrow-derived macrophages
- MSV:
-
Multistage porous silicon particle vectors
- PLGA:
-
Poly(dl-lactide-co-glycolide) acid
- PLGA-MSV:
-
PLGA-porous silicon particles composite microspheres
- PLGA-MSV/IL-4:
-
PLGA-MSV releasing IL-4
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Acknowledgments
This study was supported by the Brown Foundation (Project ID, 18130011), the Cullen Foundation (Project ID, 18130014). The work was supported by funds from the Houston Methodist Research Institute. Partial funds were acquired from the Ernest Cockrell Jr. Presidential Distinguished Chair (M.F.). We thank Dr. J. Gu, director of the HMRI Microscopy-SEM/AFM core, Dr. K. Cui, director of the HMRI ACTM core and Dr. D. Haviland, director of the HMRI Flow Cytometry core. We thank Dr. Xin Wang for her help troubleshooting the gene expression study.
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The authors declare that they have no competing interests.
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Associate Editor Michael S. Detamore oversaw the review of this article.
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Minardi, S., Corradetti, B., Taraballi, F. et al. IL-4 Release from a Biomimetic Scaffold for the Temporally Controlled Modulation of Macrophage Response. Ann Biomed Eng 44, 2008–2019 (2016). https://doi.org/10.1007/s10439-016-1580-z
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DOI: https://doi.org/10.1007/s10439-016-1580-z