This study introduces an innovative miR-133a zipper nanoparticle system that combines miRNA zipper and rolling circle transcription technologies to specifically target miR-133a in adipocytes. This novel approach could greatly enhance the delivery and release of miR-133a zippers, increasing the expression of thermogenic genes and mitochondrial biogenesis. To show the therapeutic potential of this design, the miR-133a zipper nanoparticle was utilized for the delivery of miRNA zipper-blocking miR-133a, an endogenous inhibitor of Prdm16 expression, to enhance the thermogenic activity of adipocytes by modulating their transcriptional program. Inhibition of miR-133a through our miR-133a zipper nanoparticle led to a more significant upregulation of thermogenic gene expression (Prdm16 and Ucp1) than with the free miR-133a zipper strand. Furthermore, miR-133a zipper nanoparticles increased the number of mitochondria and induced heat production, reducing the size of 3D adipose spheroids.
The innovative aspect of this approach lies in combining miRNA and siRNA sequences into a single template, which is then processed by a cellular enzyme called DICER. This ensures that each nanoparticle contains both types of RNA molecules, making the delivery more efficient and precise. The researchers found that delivering miR-133a using their nanoparticle system had a greater impact on gene expression compared to standard RNA delivery methods.
In conclusion, this study highlights the potential of RNA nanoparticles to improve the stability and specificity of RNA-based therapies, opening up new possibilities for gene therapy applications. The innovative miR-133a zipper nanoparticle system demonstrates how targeted delivery of small RNA molecules can effectively modulate gene expression and cellular function, potentially adapting to treat various genetic disorders. The research can represent a significant step forward in developing targeted treatments for obesity and related metabolic disorders. By harnessing RNA interference and nanotechnology, the team has shown it is possible to transform white fat cells into more metabolically active beige fat cells, offering a potentially safer and more effective alternative to targeted treatments for obesity and related metabolic disorders.
PUBLICATION: S. A. Yi, T. Pongkulapa, S. Nevins, L. L. Goldston, M. Chen, K.-B. Lee, Developing MiR-133a Zipper Nanoparticles for Targeted Enhancement of Thermogenic Adipocyte Generation. Adv. Healthcare Mater. 2024, 2400654. https://doi.org/10.1002/adhm.202400654
AUTHORS: Sang Ah Yi, Thanapat Pongkulapa, Sarah Nevins, Li Ling Goldston, Meizi Chen, Ki-Bum Lee
CORRESPONDENCE: Prof. Ki-Bum Lee (Rutgers University), https://kblee.rutgers.edu/
KBLEE Group Team: Dr. Sang Ah Yi, Dr. Thanapat Pongkulapa, https://kblee.rutgers.edu/
Sarah Nevins
Li Ling Goldston
Meize Chen