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Bioengineered Hybrid Collagen Scaffold Tethered with Silver‐Catechin Nanocomposite Modulates Angiogenesis and TGF‐ β Toward Scarless Healing in Chronic Deep Second Degree Infected Burns
Author(s) -
Kalirajan Cheirmadurai,
Palanisamy Thanikaivelan
Publication year - 2020
Publication title -
advanced healthcare materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.288
H-Index - 90
eISSN - 2192-2659
pISSN - 2192-2640
DOI - 10.1002/adhm.202000247
Subject(s) - scaffold , dermis , granulation tissue , angiogenesis , wound healing , regeneration (biology) , transforming growth factor , materials science , medicine , biomedical engineering , chemistry , microbiology and biotechnology , pathology , cancer research , surgery , biology
Management of burn wounds with diabetes and microbial infection is challenging in tissue engineering. The delayed wound healing further leads to scar formation in severe burn injury. Herein, a silver‐catechin nanocomposite tethered collagen scaffold with angiogenic and antibacterial properties is developed to enable scarless healing in chronic wounds infected with Pseudomonas aeruginosa under diabetic conditions. Histological observations of the granulation tissues collected from an experimental rat model show characteristic structural organizations similar to normal skin, whereas the open wound and pristine collagen scaffold treated animals display elevated dermis with thick epidermal layer and lack of appendages. Epidermal thickness of the hybrid scaffold treated diabetic animals is lowered to 33 ± 2 µm compared to 90 ± 2 µm for pristine collagen scaffold treated groups. Further, the scar elevation index of 1.3 ± 0.1 estimated for the bioengineered scaffold treated diabetic animals is closer to the normal skin. Immunohistochemical analyses provide compelling evidence for the enhanced angiogenesis as well as downregulated transforming growth factor‐ β 1 (TGF‐ β 1) and upregulated TGF‐ β 3 expressions in the hybrid scaffold treated animal groups. The insights from this study endorse the bioengineered collagen scaffolds for applications in tissue regeneration without scar in chronic burn wounds.