Gellan gum, a polysaccharide with structural similarities to glycosaminoglycans, is gaining attention in cartilage tissue engineering. It can be chemically modified with methacrylic moieties to produce a photo-crosslinkable formulation, called methacrylated gellan gum (GGMA), envisaging the injection and the in situ cross-linking through light on the cartilage surface. This study aimed to investigate the visible light cross-linking of GGMA, underlying the impact of steam sterilization on its chemical and rheological properties and cross-linking efficiency. After an initial assessment of the sterilization effects, we evaluated a combination of hydrogel concentrations (1 and 2 % w/v), ruthenium/ sodium persulfate concentrations (0.1/1, 0.2/2 and 0.5/5 mM ratios), and light exposure times (30, 60 and, 120 s). The formulations with the lowest sol fraction were characterized for mechanical and showed self-healing properties. Biological characterization on encapsulated chondrocytes in hydrogels showed high cell viability with increased metabolic activity over two weeks. The expression of genes encoding collagen type II and cartilage oligomeric matrix protein was upregulated in the softer formulation (E = 0.95 ± 0.48 kPa) composed of 2 % w/v GGMA, 0.1/1 mM Ru/SPS, and photo-crosslinked for 60 s. These findings represent an interesting overview of the potential application of visible-light crosslinked GGMA in the clinical scenario to treat cartilage defects.

Visible light-mediated cross-linking of injectable gellan gum hydrogels embedding human chondrocytes / Diego Truccoa, Lorenzo Vannozzia, Elena Gabusi, Enrico Lenzi, Cristina Manferdini, Alessia Baccia, Liliana Agrestia, Maria Rosaria Pascale, Sandra Cristino, Gina Lisignoli, Leonardo Ricottia. - In: CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS. - ISSN 2666-8939. - ELETTRONICO. - 6:(2023), pp. 100382.1-100382.14. [10.1016/j.carpta.2023.100382]

Visible light-mediated cross-linking of injectable gellan gum hydrogels embedding human chondrocytes

Elena Gabusi;Maria Rosaria Pascale;Sandra Cristino;
2023

Abstract

Gellan gum, a polysaccharide with structural similarities to glycosaminoglycans, is gaining attention in cartilage tissue engineering. It can be chemically modified with methacrylic moieties to produce a photo-crosslinkable formulation, called methacrylated gellan gum (GGMA), envisaging the injection and the in situ cross-linking through light on the cartilage surface. This study aimed to investigate the visible light cross-linking of GGMA, underlying the impact of steam sterilization on its chemical and rheological properties and cross-linking efficiency. After an initial assessment of the sterilization effects, we evaluated a combination of hydrogel concentrations (1 and 2 % w/v), ruthenium/ sodium persulfate concentrations (0.1/1, 0.2/2 and 0.5/5 mM ratios), and light exposure times (30, 60 and, 120 s). The formulations with the lowest sol fraction were characterized for mechanical and showed self-healing properties. Biological characterization on encapsulated chondrocytes in hydrogels showed high cell viability with increased metabolic activity over two weeks. The expression of genes encoding collagen type II and cartilage oligomeric matrix protein was upregulated in the softer formulation (E = 0.95 ± 0.48 kPa) composed of 2 % w/v GGMA, 0.1/1 mM Ru/SPS, and photo-crosslinked for 60 s. These findings represent an interesting overview of the potential application of visible-light crosslinked GGMA in the clinical scenario to treat cartilage defects.
2023
Visible light-mediated cross-linking of injectable gellan gum hydrogels embedding human chondrocytes / Diego Truccoa, Lorenzo Vannozzia, Elena Gabusi, Enrico Lenzi, Cristina Manferdini, Alessia Baccia, Liliana Agrestia, Maria Rosaria Pascale, Sandra Cristino, Gina Lisignoli, Leonardo Ricottia. - In: CARBOHYDRATE POLYMER TECHNOLOGIES AND APPLICATIONS. - ISSN 2666-8939. - ELETTRONICO. - 6:(2023), pp. 100382.1-100382.14. [10.1016/j.carpta.2023.100382]
Diego Truccoa, Lorenzo Vannozzia, Elena Gabusi, Enrico Lenzi, Cristina Manferdini, Alessia Baccia, Liliana Agrestia, Maria Rosaria Pascale, Sandra Cristino, Gina Lisignoli, Leonardo Ricottia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/950491
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