Graded-Three-Dimensional Cell-Encapsulating Hydrogel as a Potential Biologic Scaffold for Disc Tissue Engineering
10.1007/s13770-022-00480-2
- Author:
Zhixiang LI
1
;
Yiwen ZHANG
;
Yupeng ZHAO
;
Xubin GAO
;
Zhonglian ZHU
;
Yingji MAO
;
Taibao QIAN
Author Information
1. Department of Orthopedics, First Affiliated Hospital, School of Life Sciences, Bengbu Medical College, Bengbu 233030, China
- Publication Type:ORIGINAL ARTICLE
- From:
Tissue Engineering and Regenerative Medicine
2022;19(5):1001-1012
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND:Intervertebral disk (IVD) degeneration, which can cause lower back pain, is a major predisposing factor for disability and can be managed through multiple approaches. However, there is no satisfactory strategy currently available to reconstruct and recover the natural properties of IVDs after degeneration. As tissue engineering develops, scaffolds with embedded cell cultures have proved critical for the successful regeneration of IVDs.
METHODS:In this study, an integrated scaffold for IVD replacement was developed. Through scanning electron microscopy and other mechanical measurements, we characterized the physical properties of different hydrogels. In addition, we simulated the physiological structure of natural IVDs. Nucleus pulposus (NP) cells and annulus fibrosusderived stem cells (AFSCs) were seeded in gelatin methacrylate (GelMA) hydrogel at different concentrations to evaluate cell viability and matrix expression.
RESULTS:It was found that different concentrations of GelMA hydrogel can provide a suitable environment for cell survival. However, hydrogels with different mechanical properties influence cell adhesion and extracellular matrix component type I collagen, type II collagen, and aggrecan expression.
CONCLUSION:This tissue-engineered IVD implant had a similar structure and function as the native IVD, with the inner area mimicking the NP tissue and the outer area mimicking the stratified annulus fibrosus tissue. The new integrated scaffold demonstrated a good simulation of disc structure. The preparation of efficient and regeneration-promoting tissueengineered scaffolds is an important issue that needs to be explored in the future. It is hoped that this work will provide new ideas and methods for the further construction of functional tissue replacement discs.
