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| 1 | Improved hemostatic effects by Fe^(3+)modified biomimetic PLLA cotton-like mat via sodium alginate grafted with dopamine显示文摘The development of an excellent,bioabsorbable hemostatic material for deep wound remains a challenge.In this work,a biodegradable cotton-like biomimetic fibrous mat of poly(L-lactic acid)(PLLA)was made by melt spinning.Subsequently,SD composite was prepared by cross-linking sodium alginate(SA)with dopamine(DA).It was immobilized on the fibre surface,which inspired by mussel byssus.Finally,Fe^(3+)was loaded onto the 0.5SD/PLLA composite by chelation with the carboxyl of alginate and phenolic hydroxy of dopamine.The haemostasis experiment found that the hemostatic time 47 s in vitro.However,the bleeding volume was 0.097 g and hemostatic time was 23 s when 20Fe^(3+)-0.5SD/PLLA was applied in the haemostasis of the rat liver.As a result of its robust hydrophilicity and bouffant cotton-like structure,it could absorb a large water from blood,which could concentrate the component of blood and reduce the clotting time.Furthermore,the addition of Fe^(3+)in the 0.5SD/PLLA had a significant effect on improve hemostatic property.It also displayed excellent antibacterial property for Escherichia coli and Staphylococcus aureus.Notably,it possesses superior hemocompatibility,cytocompatibility and histocompatibility.Hence,20Fe^(3+)-0.5SD/PLLA has high potential application in haemostasis for clinical settings due to its outstanding properties. | Caili Lv Linlong Li Zixue Jiao Huanhuan Yan Zongliang Wang Zhenxu Wu Min Guo Yu Wang Peibiao Zhang | 2021 | Bioactive Materials2021，6，8： | 3 |
| 2 | Enhancing cartilage repair with optimized supramolecular hydrogel-based scaffold and pulsed electromagnetic field显示文摘Functional tissue engineering strategies provide innovative approach for the repair and regeneration of damaged cartilage.Hydrogel is widely used because it could provide rapid defect filling and proper structure support,and is biocompatible for cell aggregation and matrix deposition.Efforts have been made to seek suitable scaffolds for cartilage tissue engineering.Here Alg-DA/Ac-β-CD/gelatin hydrogel was designed with the features of physical and chemical multiple crosslinking and self-healing properties.Gelation time,swelling ratio,biodegradability and biocompatibility of the hydrogels were systematically characterized,and the injectable self-healing adhesive hydrogel were demonstrated to exhibit ideal properties for cartilage repair.Furthermore,the new hydrogel design introduces a pre-gel state before photo-crosslinking,where increased viscosity and decreased fluidity allow the gel to remain in a semi-solid condition.This granted multiple administration routes to the hydrogels,which brings hydrogels the ability to adapt to complex clinical situations.Pulsed electromagnetic fields(PEMF)have been recognized as a promising solution to various health problems owing to their noninvasive properties and therapeutic potentials.PEMF treatment offers a better clinical outcome with fewer,if any,side effects,and wildly used in musculoskeletal tissue repair.Thereby we propose PEMF as an effective biophysical stimulation to be 4th key element in cartilage tissue engineering.In this study,the as-prepared Alg-DA/Ac-β-CD/gelatin hydrogels were utilized in the rat osteochondral defect model,and the potential application of PEMF in cartilage tissue engineering were investigated.PEMF treatment were proven to enhance the quality of engineered chondrogenic constructs in vitro,and facilitate chondrogenesis and cartilage repair in vivo.All of the results suggested that with the injectable self-healing adhesive hydrogel and PEMF treatment,this newly proposed tissue engineering strategy revealed superior clinical potential for cartilage defect treatment. | Yucong Li Linlong Li Ye Li Lu Feng Bin Wang Ming Wang Haixing Wang Meiling Zhu Yongkang Yang Erik IWaldorff Nianli Zhang Ingmar Viohl Sien Lin Liming Bian Wayne Yuk-Wai Lee Gang Li | 2023 | Bioactive Materials2023，，4： | 1 |
| 3 | O-alg-THAM/gel hydrogels functionalized with engineered microspheres based on mesenchymal stem cell secretion recruit endogenous stem cells for cartilage repair显示文摘Lacking self-repair abilities,injuries to articular cartilage can lead to cartilage degeneration and ultimately result in osteoarthritis.Tissue engineering based on functional bioactive scaffolds are emerging as promising approaches for articular cartilage regeneration and repair.Although the use of cell-laden scaffolds prior to implantation can regenerate and repair cartilage lesions to some extent,these approaches are still restricted by limited cell sources,excessive costs,risks of disease transmission and complex manufacturing practices.Acellular approaches through the recruitment of endogenous cells offer great promise for in situ articular cartilage regeneration.In this study,we propose an endogenous stem cell recruitment strategy for cartilage repair.Based on an injectable,adhesive and self-healable o-alg-THAM/gel hydrogel system as scaffolds and a biophysio-enhanced bioactive microspheres engineered based on hBMSCs secretion during chondrogenic differentiation as bioactive supplement,the as proposed functional material effectively and specifically recruit endogenous stem cells for cartilage repair,providing new insights into in situ articular cartilage regeneration. | Yucong Li Linlong Li Ming Wang Boguang Yang Baozhen Huang Shanshan Bai Xiaoting Zhang Nan Hou Haixing Wang Zhengmeng Yang Chong Tang Ye Li Wayne Yuk-Wai Lee Lu Feng Micky D.Tortorella Gang Li | 2023 | Bioactive Materials2023，，10： | 0 |
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