期刊
THERANOSTICS
卷 12, 期 17, 页码 7237-7249出版社
IVYSPRING INT PUBL
DOI: 10.7150/thno.77345
关键词
Assembly; Basic fibroblast growth factor; Matrix metallopeptidase 9; Myocardial ischemia-reperfusion; Slow-release
资金
- National Natural Science Foundation of China
- Postdoctoral Research Foundation of China
- Postdoctoral Research Foundation of Anhui Province
- [21725505]
- [81970231]
- [2021M700182]
- [2021B490]
The study developed a peptide K2 to encapsulate bFGF and proposed an EISA strategy to slowly release bFGF in ischemic myocardium. Results showed that bFGF@K2 micelle exerted a stronger cardioprotective effect than free bFGF in a rat model of myocardial ischemia-reperfusion, potentially offering a promising treatment strategy for MI in the future.
Background: The only effective treatment for myocardial infarction (MI) is the timely restoration of coronary blood flow in the infarcted area, but further reperfusion exacerbates myocardial injury and leads to distal coronary no-reflow, which affects patient prognosis. Angiogenesis could be an important therapeutic strategy for re-establishing the blood supply to save the ischemic myocardium after MI. Basic fibroblast growth factor (bFGF) has been shown to promote angiogenesis. However, direct intravenous administration of bFGF is not a viable option given its poor half-life in vivo.Methods: Herein, we developed a peptide Lys-Lys-Pro-Leu-Gly-Leu-Ala-Gly-Phe-Phe (K2) to encapsulate bFGF to form bFGF@K2 micelle and proposed an enzyme-instructed self-assembly (EISA) strategy to deliver and slowly release bFGF in the ischemic myocardium. Results: The bFGF@K2 micelle exerted a stronger cardioprotective effect than free bFGF in a rat model of myocardial ischemia-reperfusion (MI/R). In vitro results revealed that the bFGF@K2 micelle could be cleaved by matrix metallopeptidase 9 (MMP-9) to yield bFGF@Nanofiber through amphipathic changes. In vivo experiments indicated that intravenous administration of bFGF@K2 micelle could lead to their restructuring into bFGF@Nanofiber and long term retention of bFGF in the ischemic myocardium of rat due to high expression of MMP-9 and assembly-induced retention (AIR) effect, respectively. Twenty-eight days after MI/R model establishment, bFGF@K2 micelle treatment significantly reduced fibrosis and improved cardiac function of the rats.Conclusion: We predict that our strategy could be applied in clinic for MI treatment in the future.
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