Comparing the regeneration potential between PLLA/Aragonite and PLLA/ Vaterite pearl composite scaffolds in rabbit radius segmental bone defects  

作　　者：Qianli Huang Yuansheng Liu Zhengxiao Ouyang Qingling Feng 

机构地区：[1]State Key Laboratory of Powder Metallurgy,Central South University,Changsha,410083,PR China [2]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,PR China [3]Public Security College,Northwest University of Political Science and Law,Xi'an,710122,PR China [4]Department of Orthopedics,The Second Xiangya Hospital,Central South University,Changsha,410083,PR China

出　　处：《Bioactive Materials》2020年第4期980-989,共10页生物活性材料（英文）

基　　金：the financial support from the China Postdoctoral Science Foundation(2018M630909 and 2019T120711).

摘　　要：Mussel-derived nacre and pearl,which are natural composites composed CaCO3 platelets and interplatelet organic matrix,have recently gained interest due to their osteogenic potential.The crystal form of CaCO3 could be either aragonite or vaterite depending on the characteristics of mineralization template within pearls.So far,little attention has been paid on the different osteogenic capacities between aragonite and vaterite pearl.In the current work,aragonite or vaterite pearl powders were incorporated into poly-L-lactic acid(PLLA)scaffold as bio-functional fillers for enhanced osteogenesis.In intro results revealed that PLLA/aragonite scaffold possessed stronger stimulatory effect on SaOS-2 cell proliferation and differentiation,evidenced by the enhanced cell viability,alkaline phosphatase activity,collagen synthesis and gene expressions of osteogenic markers including osteocalcin,osteopotin and bone sialoprotein.The bone regeneration potential of various scaffolds was evaluated in vivo employing a rabbit critical-sized radial bone defect model.The X-ray and micro-CT results showed that significant bone regeneration and bridging were achieved in defects implanted with composite scaffolds,while less bone formation and non-bridging were found for pure PLLA group.Histological evaluation using Masson's trichrome and hematoxylin/eosin(H&E)staining indicated a typical endochondral bone formation process conducted at defect sites treated with composite scaffolds.Through three-point bending test,the limbs implanted with PLLA/aragonite scaffold were found to bear significantly higher bending load compared to other two groups.Together,it is suggested that aragonite pearl has superior osteogenic capacity over vaterite pearl and PLLA/aragonite scaffold can be employed as a potential bone graft for bone regeneration.

关 键 词：Composite scaffold ARAGONITE VATERITE Segmental bone defect Bone regeneration 

分 类 号：R318[医药卫生—生物医学工程] R68[医药卫生—基础医学]