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Formation of Muscle Fibers from Myoblasts01:13

Formation of Muscle Fibers from Myoblasts

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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Related Experiment Video

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Systemic Delivery of MicroRNA Using Recombinant Adeno-associated Virus Serotype 9 to Treat Neuromuscular Diseases in Rodents
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Effect of microRNA modulation on bioartificial muscle function.

Caroline Rhim1, Cindy S Cheng, William E Kraus

  • 1Department of Biomedical Engineering, Duke University, Durham, North Carolina, USA.

Tissue Engineering. Part A
|July 31, 2010
PubMed
Summary

Inhibiting microRNA-133 (miR-133) in bioartificial muscles enhanced cell differentiation and increased peak force by 20%. This study shows microRNA regulation impacts engineered muscle tissue function.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Regenerative Medicine

Background:

  • MicroRNAs (miRNAs) are small RNA molecules regulating cellular processes.
  • Dysregulated cellular processes are implicated in various diseases.
  • Tissue engineering utilizes cellular therapies for disease treatment.

Purpose of the Study:

  • To investigate the impact of transient muscle-specific miRNA inhibition on bioartificial muscle (BAM) function.
  • To assess the effect of inhibiting miR-133 on skeletal myoblast differentiation and BAM performance.

Main Methods:

  • Utilized three-dimensional skeletal muscle cultures (BAMs).
  • Inhibited miR-133 using anti-miR-133 transfection.
  • Measured functional force via electrical stimulation (0-20 Hz).
  • Performed immunostaining for structural and differentiation markers (alpha-actinin, myosin, Mef2).

Main Results:

  • miR-133 inhibition enhanced skeletal myoblast differentiation in vitro.
  • BAMs with anti-miR-133 showed 20% higher peak forces compared to controls.
  • Improved myofiber organization, distinct striations, and larger fiber diameters were observed.
  • Increased Mef2 nuclear staining indicated enhanced myogenic differentiation.

Conclusions:

  • Transient muscle-specific miRNA inhibition, specifically of miR-133, positively affects engineered muscle tissue.
  • miRNA mediation demonstrates functional effects on tissue-engineered constructs.
  • This research opens avenues for miRNA-based therapeutic strategies in regenerative medicine.