https://www.selleckchem.com/products/pha-767491.html In addition, nanotopology, mircoRNAs, etc. regulate the expression of a variety of osteogenic and chondrogenic transcription factors through up- and down-regulation of KDMs. In summary, the role of histone demethylase in the osteogenic and chondrogenic differentiation of mesenchymal stem cells will help us better understand the pathogenesis of bone and cartilage damage diseases, and establish the foundation of future clinical applications for bone and cartilage tissue engineering.Hydroxyapatite (HAp) is the main inorganic component of the bones and teeth, and it possesses bioactivity and biocompatibility. However, due to its poor mechanical performance, slow degradation speed, and lack of diversity in its function, it is difficult to apply HAp alone as a scaffold material for bone tissue engineering. By combining HAp with other types of materials, composite materials with specific properties can be prepared, and the scopes of HAp applications can be expanded. Firstly, we elaborated on the importance, and strengths and weaknesses of HAp for bone tissue engineering biomaterials and then reviewed the research status of HAp composite materials used in bone regeneration. Secondly, about hot research topics in the field of applying HAp composite materials in bone repair, we summarized the representative findings in the field, and discussions and analysis were made accordingly. Finally, we also examined the future development prospects of HAp composite bone repair materials.Modern tissue clearing techniques have made it possible to have high-resolution imaging of cell populations and three-dimensional reconstruction of tissue structures, and we are able to obtain more complete three-dimensional brain structures and spatial connections between the various components of brain tissues through tissue clearing techniques. Over the past decade, scientists have developed and improved a number of tissue clearing techniques that