Wuchao Ma,Meilian Yang,Di Wu,Yao Li,Li-Shu Wang,Hesham R. El-Seedi,Chao Wu,Ming Du
Loading bioactive molecules, such as proteins and peptides, into hydrogels is a promising strategy to expand the application of hydrogels in tissue engineering. Herein, a novel bioactive gelatin hydrogel loading peptide derived from Atlantic cod (Gadus morhua) was developed for bone tissue engineering, which was constructed on the NaIO 4 -mediated oxidative coupling of dopamine-modified gelatin (Gel-DA). The Gel-DA hydrogel incorporated with cod peptides (0.5 mg/mL) showed an acceptable gelation time (130.22 ± 7.15 s) and maintained a continuous microscopic pore structure . Besides, the compression strength and adhesive strength of Gel-DA hydrogel with 0.5 mg/mL cod peptides reached 136.33 ± 38.95 kPa and 4.93 ± 0.80 kPa, respectively. Meanwhile, all hydrogels exhibited excellent mechanical stability. The incorporation of cod peptides (0.1, 0.5 mg/mL) was beneficial to the adhesion and spreading of mouse osteoblasts precursor cells MC3T3-E1. Moreover, the alkaline phosphatase (ALP) activity of the Gel-DA hydrogel loading 0.5 mg/mL peptides was significantly increased from 0.16 ± 0.02 U.mg/protein to 0.19 ± 0.02 U.mg/protein as compared to Gel-DA hydrogel. These results indicated that the GD-CPs hydrogel is an effective candidate material for bone tissue engineering.
Wuchao Ma,Meilian Yang,Chao Wu,Shaoyun Wang,Ming Du
Hydrogels with great biocompatibility, biodegradability, and mechanical properties, combined with osteoconductivity, osteoinductivity, and osteointegration as biomaterials for bone regeneration without adding exogenous growth factors and cells are highly appealing but challenging. Here, inspired by organic-inorganic analogues of natural bone tissue and the adhesion chemistry of mussels, nanocomposite hydrogels with self-healing, injectable, adhesive, antioxidant, and osteoinductive properties (termed GO-PHA-CPs) were constructed by Schiff base cross-linking between dopamine-modified gelatin (Gel-DA) and oxidized dextran (ODex). Furthermore, the hydrogel network was enhanced by the introduction of polydopamine-functionalized nanohydroxyapatite (PHA) by improving the interfacial compatibility between the rigid inorganic particles and the flexible hydrogel matrix. Bioactive cod peptides (CPs) with osteogenic activity from Atlantic cod were further incorporated into the nanocomposite hydrogel. As a result, the multicomponent nanocomposite hydrogel favored the adhesion and spreading of MC3T3-E1 cells. The increased ALP activity suggested that GO-PHA-CPs hydrogels contributed to the osteogenic differentiation of MC3T3-E1 cells. The suitability of GO-PHA-CPs hydrogels for enhancing bone regeneration in vivo was further confirmed by the rat femoral defect model. Our results indicate that the multifunctional GO-PHA-CPs nanocomposite hydrogels without growth factors are a promising and effective candidate material for bone regeneration.
危险品化学品经营许可证（带存储）