A Factor-Free Hydrogel with ROS Scavenging and Responsive Degradation for Enhanced Diabetic Bone Healing.
Qin ZhangWeikai ChenGuangfeng LiZhixin MaMengru ZhuQianmin GaoKe XuXinru LiuWenyi LuWencai ZhangYan WuZhongmin ShiXiaolong LiPublished in: Small (Weinheim an der Bergstrasse, Germany) (2024)
In view of the increased levels of reactive oxygen species (ROS) that disturb the osteogenic differentiation of bone marrow mesenchymal stem cells (BMSCs), the repair of diabetic bone defects remains a great challenge. Herein, a factor-free hydrogel is reported with ROS scavenging and responsive degradation properties for enhanced diabetic bone healing. These hydrogels contain ROS-cleavable thioketal (TK) linkers and ultraviolet (UV)-responsive norbornene (NB) groups conjugated with 8-arm PEG macromers, which are formed via UV crosslinking-mediated gelation. Upon reacting with high levels of ROS in the bone defect microenvironment, ROS-cleavable TK linkers are destroyed, allowing the responsive degradation of hydrogels, which promotes the migration of BMSCs. Moreover, ROS levels are reduced through hydrogel-mediated ROS scavenging to reverse BMSC differentiation from adipogenic to osteogenic phenotype. As such, a favorable microenvironment is created after simultaneous ROS scavenging and hydrogel degradation, leading to the effective repair of bone defects in diabetic mouse models, even without the addition of growth factors. Thus, this study presents a responsive hydrogel platform that regulates ROS scavenging and stromal degradation in bone engineering.
Keyphrases
- reactive oxygen species
- wound healing
- cell death
- drug delivery
- dna damage
- bone mineral density
- cancer therapy
- hyaluronic acid
- type diabetes
- soft tissue
- tissue engineering
- bone loss
- stem cells
- postmenopausal women
- bone regeneration
- mouse model
- oxidative stress
- photodynamic therapy
- mesenchymal stem cells
- high throughput
- body composition
- extracellular matrix
- drug release