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Article

Collagen Fibril Density Modulates Macrophage Activation and Cellular Functions during Tissue Repair

1
Division of Engineering, New York University Abu Dhabi, Abu Dhabi 129188, UAE
2
Department of Genetics and Microbiology, Autonomous University of Barcelona, 08193 Barcelona, Spain
3
Department of Mechanical and Biomedical Engineering, New York University, New York, NY 10003, USA
*
Author to whom correspondence should be addressed.
Contributed equally to this work.
Bioengineering 2020, 7(2), 33; https://doi.org/10.3390/bioengineering7020033
Received: 4 March 2020 / Revised: 26 March 2020 / Accepted: 30 March 2020 / Published: 31 March 2020
(This article belongs to the Special Issue Extracellular Matrix in Wound Healing)
Monocytes circulate in the bloodstream, extravasate into the tissue and differentiate into specific macrophage phenotypes to fulfill the immunological needs of tissues. During the tissue repair process, tissue density transits from loose to dense tissue. However, little is known on how changes in tissue density affects macrophage activation and their cellular functions. In this work, monocytic cell line THP-1 cells were embedded in three-dimensional (3D) collagen matrices with different fibril density and were then differentiated into uncommitted macrophages (MPMA) using phorbol-12-myristate-13-acetate (PMA). MPMA macrophages were subsequently activated into pro-inflammatory macrophages (MLPS/IFNγ) and anti-inflammatory macrophages (MIL-4/IL-13) using lipopolysaccharide and interferon-gamma (IFNγ), and interleukin 4 (IL-4) and IL-13, respectively. Although analysis of cell surface markers, on both gene and protein levels, was inconclusive, cytokine secretion profiles, however, demonstrated differences in macrophage phenotype. In the presence of differentiation activators, MLPS/IFNγ secreted high amounts of IL-1β and tumor necrosis factor alpha (TNFα), while M0PMA secreted similar cytokines to MIL-4/IL-13, but low IL-8. After removing the activators and further culture for 3 days in fresh cell culture media, the secretion of IL-6 was found in high concentrations by MIL-4/IL-13, followed by MLPS/IFNγ and MPMA. Interestingly, the secretion of cytokines is enhanced with an increase of fibril density. Through the investigation of macrophage-associated functions during tissue repair, we demonstrated that M1LPS/IFNγ has the potential to enhance monocyte infiltration into tissue, while MIL-4/IL-13 supported fibroblast differentiation into myofibroblasts via transforming growth factor beta 1 (TGF-β1) in dependence of fibril density, suggesting a M2a-like phenotype. Overall, our results suggest that collagen fibril density can modulate macrophage response to favor tissue functions. Understanding of immune response in such complex 3D microenvironments will contribute to the novel therapeutic strategies for improving tissue repair, as well as guidance of the design of immune-modulated materials. View Full-Text
Keywords: macrophage; collagen fibril density; immunomechanobiology; monocyte infiltration; fibroblast differentiation macrophage; collagen fibril density; immunomechanobiology; monocyte infiltration; fibroblast differentiation
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MDPI and ACS Style

Sapudom, J.; Mohamed, W.K.E.; Garcia-Sabaté, A.; Alatoom, A.; Karaman, S.; Mahtani, N.; Teo, J.C.M. Collagen Fibril Density Modulates Macrophage Activation and Cellular Functions during Tissue Repair. Bioengineering 2020, 7, 33. https://doi.org/10.3390/bioengineering7020033

AMA Style

Sapudom J, Mohamed WKE, Garcia-Sabaté A, Alatoom A, Karaman S, Mahtani N, Teo JCM. Collagen Fibril Density Modulates Macrophage Activation and Cellular Functions during Tissue Repair. Bioengineering. 2020; 7(2):33. https://doi.org/10.3390/bioengineering7020033

Chicago/Turabian Style

Sapudom, Jiranuwat, Walaa K.E. Mohamed, Anna Garcia-Sabaté, Aseel Alatoom, Shaza Karaman, Nikhil Mahtani, and Jeremy C.M. Teo. 2020. "Collagen Fibril Density Modulates Macrophage Activation and Cellular Functions during Tissue Repair" Bioengineering 7, no. 2: 33. https://doi.org/10.3390/bioengineering7020033

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