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Enhanced delivery of microRNA mimics to cardiomyocytes using ultrasound responsive microbubbles reverses hypertrophy in an in-vitro model. | LitMetric
Background : Cardiovascular diseases (CVD) account for 36% of deaths in Europe and the United States. Gene therapy can act as a therapeutic modality for the treatment of CVD. The use of microRNA mimetics may be advantageous as they regulate important processes in health and pathology. A major hurdle for using miRNA therapies relates to site specific delivery and sufficient cellular uptake of material to achieve efficacyObjective : To assess the feasibility of ultrasound responsive microbubble mediated delivery of miR mimics to cardiomyocytes.Methods : Liposome/microbubble formulations were added to HL-1 cardiomyocytes in the presence/absence of ultrasound (US). Transfection efficacy and functionality was assessed using epifluorescent microscopy, flow cytometry and qRT-PCR. DNA Quantification post-ultrasound mediated transfection of HL-1s using microbubbles was quantified. The capability of miR-133 microbubble formulations to suppress hypertrophy were measured by quantifying changes in cell size.Results : Ultrasound mediated microbubble formulations enhanced intracellular delivery of miR mimics in cardiomyocytes. Both complexed/encapsulated miR-microbubble formulations delivered functional miR mimics and showed no adverse effect on cardiomyocyte viability. Furthermore, ultrasound mediated microbubble transfection of miR-133 mimics reversed cardiomyocyte hypertrophy in an in-vitro model.Conclusions : This novel delivery method has the potential for further development as a targeted delivery strategy for miR therapeutics to the heart.
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