1
|
Mölzer C, Shankar SP, Masalski V, Griffith M, Kuffová L, Forrester JV. TGF-β1-activated type 2 dendritic cells promote wound healing and induce fibroblasts to express tenascin c following corneal full-thickness hydrogel transplantation. J Tissue Eng Regen Med 2019; 13:1507-1517. [PMID: 30938102 DOI: 10.1002/term.2853] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 02/25/2019] [Accepted: 03/15/2019] [Indexed: 12/13/2022]
Abstract
We showed previously that 1-ethyl-3-(3-dimethylamino-propyl)-carbodiimide hydrochloride (EDC) cross-linked recombinant human collagen III hydrogels promoted stable regeneration of the human cornea (continued nerve and stromal cell repopulation) for over 4 years. However, as EDC cross linking kinetics were difficult to control, we additionally tested a sterically bulky carbodiimide. Here, we compared the effects of two carbodiimide cross linkers-bulky, aromatic N-cyclohexyl-N0-(2-morpholinoethyl)-carbodiimide (CMC), and nonbulky EDC-in a mouse corneal graft model. Murine corneas undergoing full-thickness implantation with these gels became opaque due to dense retro-corneal membranes (RCM). Corneal epithelial cytokeratin 12 and alpha smooth muscle actin indicative of functional tissue regeneration and wound contraction were observed in RCM surrounding both hydrogel types. However, quantitatively different levels of infiltrating CD11c+ dendritic cells (DC) were found, suggesting a hydrogel-specific innate immune response. More DC infiltrated the stroma surrounding EDC-N-hydroxysuccinimide (NHS) hydrogels concurrently with higher fibrosis-associated tenascin c expression. The opposite was true for CMC-NHS gels that had previously been shown to be more tolerising to DC. In vitro studies showed that DC cultured with transforming growth factor β1 (TGF-β1) induced fibroblasts to secrete more tenascin c than those cultured with lipopolysaccharide and this effect was blocked by TGF-β1 neutralisation. Furthermore, tenascin c staining was found in 40- to 50μm long membrane nanotubes formed in fibroblast/DC cocultures. We suggest that TGF-β1 alternatively activated (tolerising) DC regulate fibroblast-mediated tenascin c secretion, possibly via local production of TGF-β1 in early wound contraction, and that this is indirectly modulated by different hydrogel chemistries.
Collapse
Affiliation(s)
- Christine Mölzer
- School of Medicine and Dentistry, Section of Immunology, Inflammation and Infection, Institute of Medical Sciences, Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | - Sucharita P Shankar
- School of Medicine and Dentistry, Section of Immunology, Inflammation and Infection, Institute of Medical Sciences, Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | - Vlad Masalski
- School of Medicine and Dentistry, Section of Immunology, Inflammation and Infection, Institute of Medical Sciences, Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | - May Griffith
- Integrative Regenerative Medicine Centre, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.,Department of Ophthalmology, University of Montreal and Maisonneuve-Rosemont Hospital Research Centre, Montreal, QC, Canada
| | - Lucia Kuffová
- School of Medicine and Dentistry, Section of Immunology, Inflammation and Infection, Institute of Medical Sciences, Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | - John V Forrester
- School of Medicine and Dentistry, Section of Immunology, Inflammation and Infection, Institute of Medical Sciences, Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| |
Collapse
|
2
|
Mölzer C, Shankar SP, Griffith M, Islam MM, Forrester JV, Kuffová L. Activation of dendritic cells by crosslinked collagen hydrogels (artificial corneas) varies with their composition. J Tissue Eng Regen Med 2019; 13:1528-1543. [PMID: 31144475 DOI: 10.1002/term.2903] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 05/01/2019] [Accepted: 05/24/2019] [Indexed: 12/13/2022]
Abstract
Activated T cells are known to promote fibrosis, a major complication limiting the range of polymeric hydrogels as artificial corneal implants. As T cells are activated by dendritic cells (DC), minimally activating hydrogels would be optimal. In this study, we evaluated the ability of a series of engineered (manufactured/fabricated) and natural collagen matrices to either activate DC or conversely induce DC apoptosis in vitro. Bone marrow DC were cultured on a series of singly and doubly crosslinked hydrogels (made from recombinant human collagen III [RHCIII] or collagen mimetic peptide [CMP]) or on natural collagen-containing matrices, MatrigelTM and de-cellularised mouse corneal stroma. DC surface expression of major histocompatibility complex Class II and CD86 as well as apoptosis markers were examined. Natural matrices induced low levels of DC activation and maintained a "tolerogenic" phenotype. The same applied to singly crosslinked CMP-PEG gels. RHCIII gels singly crosslinked using either N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide with the coinitiator N-hydroxy succinimide (EDC-NHS) or N-cyclohexyl-N-(2-morpholinoethyl)carbodiimide metho-p-toulenesulfonate with NHS (CMC-NHS) induced varying levels of DC activation. In contrast, however, RHCIII hydrogels incorporating an additional polymeric network of 2-methacryloyloxyethyl phosphorylcholine did not activate DC but instead induced DC apoptosis, a phenomenon observed in natural matrices. This correlated with increased DC expression of leukocyte-associated immunoglobulin-like receptor-1. Despite low immunogenic potential, viable tolerogenic DC migrated into and through both natural and manufactured RHCIII gels. These data show that the immunogenic potential of RHCIII gels varies with the nature and composition of the gel. Preclinical evaluation of hydrogel immunogenic/fibrogenic potential is recommended.
Collapse
Affiliation(s)
- Christine Mölzer
- School of Medicine and Dentistry, Section of Immunology, Inflammation and Infection, Institute of Medical Sciences, Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | - Sucharita P Shankar
- School of Medicine and Dentistry, Section of Immunology, Inflammation and Infection, Institute of Medical Sciences, Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | - May Griffith
- Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.,Department of Ophthalmology, Maisonneuve-Rosemont Hospital Research Centre, University of Montreal, Montreal, QC, Canada
| | - Mirazul M Islam
- Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden.,Schepens Eye Research Institute and Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, MA, USA
| | - John V Forrester
- School of Medicine and Dentistry, Section of Immunology, Inflammation and Infection, Institute of Medical Sciences, Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| | - Lucia Kuffová
- School of Medicine and Dentistry, Section of Immunology, Inflammation and Infection, Institute of Medical Sciences, Division of Applied Medicine, University of Aberdeen, Aberdeen, UK
| |
Collapse
|