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Nano Research 2022, 15(7): 6348-6360 https://doi.org/10.1007/s12274-022-4292-8
Research Article | Issue | Published: 20 April 2022

A novel gene-activated matrix composed of PEI/plasmid-BMP2 complexes and hydroxyapatite/chitosan-microspheres promotes bone regeneration

Show Author's Information Ruyuan Ding1,  Yajun Liu1,  Dawei Cheng4,  Gang Yang1,  Wenjing Wu1,  Haoran Du1,  Xin Jin1,  Yihan Chen1,  Yuanyin Wang1,4( ),  Boon Chin HENG2,3( ),  Qing Yang5( ),  Jianguang XU1( )
Key Lab. of Oral Diseases Research of Anhui Province, College & Hospital of Stomatology, Anhui Medical University, Hefei 230032, China
Central Laboratory, Peking University School and Hospital of Stomatology, Beijing 100081, China
School of Medical and Life Sciences, Sunway University, Selangor Darul Ehsan, Malaysia
Department of Orthopaedics, The First Affiliated Hospital of Anhui Medical University, Anhui Medical University, Hefei 230032, China
Department of Chemistry, and Laboratory of Nanomaterials for Energy Conversion (LNEC), University of Science and Technology of China (USTC), Hefei 230026, China
Keywords:
nanoparticle, chitosan, regeneration, gene therapy, microsphere, BMP2
Topics:
Tissue engineering
Cite this article:
Ding R, Liu Y, Cheng D, et al. A novel gene-activated matrix composed of PEI/plasmid-BMP2 complexes and hydroxyapatite/chitosan-microspheres promotes bone regeneration. Nano Research, 2022, 15(7): 6348-6360. https://doi.org/10.1007/s12274-022-4292-8
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Abstract Full text Electronic supplementary material About this article

The incorporation of pro-osteogenic growth factors into bone graft materials to enhance bone regeneration is a key research area within the field of bone tissue engineering and regenerative medicine. However, growth factors directly incorporated in protein form are easily degraded, and have a limited active half-life, which cannot exert long-term and stable osteoinductive and oteoconductive effects. The combination of gene therapy and tissue engineering through gene-activated matrix (GAM) may provide a good alternative solution to overcome such limitations. Scaffold materials can be combined together with plasmid DNA and a chemical-based transfection agent to form GAM, through which transfected cells could secrete growth factors in a sustained manner over a longer time duration; thereby enabling bone graft materials to act as a repository of therapeutic genes, while providing structural support and a scaffold matrix for new bone tissue ingrowth. In this study, we prepared hydroxyapatite/chitosan-microspheres (HA/CS-MS) with microfabrication technology and emulsification method, and loaded the polyethylene imine/bone morphogenetic protein 2 plasmid (PEI/pBMP2) complexes with high transfection capacity (transfection efficiency up to 54.79% ± 4.95%), thus forming a novel GAM system with superior bone regeneration capacity—PEI/pBMP2-HA/CS-MS. The in vitro experiments in this study demonstrated that our GAM had excellent biocompatibility (with cell viability over 95%), and that the as-fabricated microsphere material possessed a nano-network fibrous structure similar to natural extracellular matrix (ECM), together with a higher surface area that can provide more cell adhesion sites. The sizes of the prepared microspheres were mainly distributed in the 160–180 μm range, while the maximal loading rate of PEI-pBMP2 complexes was 59.79% ± 1.85%. As a loaded complexes system, the GAM can release plasmids in a slow controlled manner, effectively transfecting surrounding target cells (release effect for up to 21 days), while cells adherent to the material can also take up plasmids, resulting in sustained secretion of the target protein, thereby effectively promoting bone regeneration. In vivo data from micro-computed tomography (micro-CT) and histological staining showed that the use of the composite materials effectively enhanced bone regeneration in defect areas. These findings thus demonstrated that the novel GAM system had excellent osteoinductivity with significant clinical potential.


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Electronic supplementary material
About this article

A novel gene-activated matrix composed of PEI/plasmid-BMP2 complexes and hydroxyapatite/chitosan-microspheres promotes bone regeneration

Show Author's information Ruyuan Ding1, Yajun Liu1, Dawei Cheng4, Gang Yang1, Wenjing Wu1, Haoran Du1, Xin Jin1, Yihan Chen1, Yuanyin Wang1,4( ), Boon Chin HENG2,3( ), Qing Yang5( ), Jianguang XU1( )
Key Lab. of Oral Diseases Research of Anhui Province, College & Hospital of Stomatology, Anhui Medical University, Hefei 230032, China
Central Laboratory, Peking University School and Hospital of Stomatology, Beijing 100081, China
School of Medical and Life Sciences, Sunway University, Selangor Darul Ehsan, Malaysia
Department of Orthopaedics, The First Affiliated Hospital of Anhui Medical University, Anhui Medical University, Hefei 230032, China
Department of Chemistry, and Laboratory of Nanomaterials for Energy Conversion (LNEC), University of Science and Technology of China (USTC), Hefei 230026, China

Abstract

The incorporation of pro-osteogenic growth factors into bone graft materials to enhance bone regeneration is a key research area within the field of bone tissue engineering and regenerative medicine. However, growth factors directly incorporated in protein form are easily degraded, and have a limited active half-life, which cannot exert long-term and stable osteoinductive and oteoconductive effects. The combination of gene therapy and tissue engineering through gene-activated matrix (GAM) may provide a good alternative solution to overcome such limitations. Scaffold materials can be combined together with plasmid DNA and a chemical-based transfection agent to form GAM, through which transfected cells could secrete growth factors in a sustained manner over a longer time duration; thereby enabling bone graft materials to act as a repository of therapeutic genes, while providing structural support and a scaffold matrix for new bone tissue ingrowth. In this study, we prepared hydroxyapatite/chitosan-microspheres (HA/CS-MS) with microfabrication technology and emulsification method, and loaded the polyethylene imine/bone morphogenetic protein 2 plasmid (PEI/pBMP2) complexes with high transfection capacity (transfection efficiency up to 54.79% ± 4.95%), thus forming a novel GAM system with superior bone regeneration capacity—PEI/pBMP2-HA/CS-MS. The in vitro experiments in this study demonstrated that our GAM had excellent biocompatibility (with cell viability over 95%), and that the as-fabricated microsphere material possessed a nano-network fibrous structure similar to natural extracellular matrix (ECM), together with a higher surface area that can provide more cell adhesion sites. The sizes of the prepared microspheres were mainly distributed in the 160–180 μm range, while the maximal loading rate of PEI-pBMP2 complexes was 59.79% ± 1.85%. As a loaded complexes system, the GAM can release plasmids in a slow controlled manner, effectively transfecting surrounding target cells (release effect for up to 21 days), while cells adherent to the material can also take up plasmids, resulting in sustained secretion of the target protein, thereby effectively promoting bone regeneration. In vivo data from micro-computed tomography (micro-CT) and histological staining showed that the use of the composite materials effectively enhanced bone regeneration in defect areas. These findings thus demonstrated that the novel GAM system had excellent osteoinductivity with significant clinical potential.

Keywords: nanoparticle, chitosan, regeneration, gene therapy, microsphere, BMP2

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Publication history
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Acknowledgements

Publication history

Received: 18 January 2022
Revised: 01 March 2022
Accepted: 04 March 2022
Published: 20 April 2022
Issue date: July 2022

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51973004) and the Natural Science Foundation of Anhui Province, China (No. 1908085MH255).

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