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Howard MT, Wang S, Berger AG, Martin JR, Jalili-Firoozinezhad S, Padera RF, Hammond PT. Sustained release of BMP-2 using self-assembled layer-by-layer film-coated implants enhances bone regeneration over burst release. Biomaterials 2022; 288:121721. [PMID: 35981926 PMCID: PMC10396073 DOI: 10.1016/j.biomaterials.2022.121721] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 07/08/2022] [Accepted: 08/01/2022] [Indexed: 11/23/2022]
Abstract
Current clinical products delivering the osteogenic growth factor bone morphogenetic protein 2 (BMP-2) for bone regeneration have been plagued by safety concerns due to a high incidence of off-target effects resulting from bolus release and supraphysiological doses. Layer-by-layer (LbL) film deposition offers the opportunity to coat bone defect-relevant substrates with thin films containing proteins and other therapeutics; however, control of release kinetics is often hampered by interlayer diffusion of drugs throughout the film during assembly, which causes burst drug release. In this work, we present the design of different laponite clay diffusional barrier layer architectures in self-assembled LbL films to modulate the release kinetics of BMP-2 from the surface of a biodegradable implant. Release kinetics were tuned by incorporating laponite in different film arrangements and with varying deposition techniques to achieve release of BMP-2 over 2 days, 4 days, 14 days, and 30 days. Delivery of a low dose (0.5 μg) of BMP-2 over 2 days and 30 days using these LbL film architectures was then compared in an in vivo rat critical size calvarial defect model to determine the effect of BMP-2 release kinetics on bone regeneration. After 6 weeks, sustained release of BMP-2 over 30 days induced 3.7 times higher bone volume and 7.4 times higher bone mineral density as compared with 2-day release of BMP-2, which did not induce more bone growth than the uncoated scaffold control. These findings represent a crucial step in the understanding of how BMP-2 release kinetics influence treatment efficacy and underscore the necessity to optimize protein delivery methods in clinical formulations for bone regeneration. This work could be applied to the delivery of other therapeutic proteins for which careful tuning of the release rate is a key optimization parameter.
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Affiliation(s)
- MayLin T Howard
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States.
| | - Sheryl Wang
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States; Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States.
| | - Adam G Berger
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States; Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States.
| | - John R Martin
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States.
| | - Sasan Jalili-Firoozinezhad
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States; Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States.
| | - Robert F Padera
- Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States; Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, 02215, United States.
| | - Paula T Hammond
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, United States.
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Liu Y, Li Y, Keskin D, Shi L. Poly(β-Amino Esters): Synthesis, Formulations, and Their Biomedical Applications. Adv Healthc Mater 2019; 8:e1801359. [PMID: 30549448 DOI: 10.1002/adhm.201801359] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 12/04/2018] [Indexed: 12/12/2022]
Abstract
Poly(β-amino ester) (abbreviated as PBAE or PAE) refers to a polymer synthesized from an acrylate and an amine by Michael addition and has properties inherent to tertiary amines and esters, such as pH responsiveness and biodegradability. The versatility of building blocks provides a library of polymers with miscellaneous physicochemical and mechanical properties. When used alone or together with other materials, PBAEs can be fabricated into different formulations in order to fulfill various requirements in drug delivery (for instance, gene, anticancer drugs, and antimicrobials delivery) and natural complex mimicry (nanochaperones). This progress report discusses the recent developments in design, synthesis, formulations, and applications of PBAEs in biomedical fields and provides a perspective view for the future of the PBAEs.
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Affiliation(s)
- Yong Liu
- State Key Laboratory of Medicinal Chemical BiologyKey Laboratory of Functional Polymer MaterialsMinistry of EducationInstitute of Polymer ChemistryCollege of ChemistryNankai University Tianjin 300071 China
- Department of Biomedical EngineeringUniversity of Groningen and University Medical Center Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
| | - Yuanfeng Li
- State Key Laboratory of Medicinal Chemical BiologyKey Laboratory of Functional Polymer MaterialsMinistry of EducationInstitute of Polymer ChemistryCollege of ChemistryNankai University Tianjin 300071 China
- Department of Biomedical EngineeringUniversity of Groningen and University Medical Center Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
| | - Damla Keskin
- Department of Biomedical EngineeringUniversity of Groningen and University Medical Center Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
| | - Linqi Shi
- State Key Laboratory of Medicinal Chemical BiologyKey Laboratory of Functional Polymer MaterialsMinistry of EducationInstitute of Polymer ChemistryCollege of ChemistryNankai University Tianjin 300071 China
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