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Related Concept Videos

MicroRNAs01:22

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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...
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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Related Experiment Video

Updated: Oct 22, 2025

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Exosome microRNAs in Amyotrophic Lateral Sclerosis: A Pilot Study.

Francesca Pregnolato1, Lidia Cova2, Alberto Doretti2

  • 1Experimental Laboratory of Immunological and Rheumatologic Researches, Istituto Auxologico Italiano, IRCCS, Cusano Milanino, 20095 Milan, Italy.

Biomolecules
|August 27, 2021
PubMed
Summary

This study investigated exosomal microRNAs (miRNAs) in amyotrophic lateral sclerosis (ALS) patients. While no significant differences were found, further research into exosome-derived miRNAs in ALS pathogenesis is warranted.

Keywords:
amyotrophic lateral sclerosisbiomarkersexosomemiRNAserum

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Amyotrophic lateral sclerosis (ALS) pathogenesis is largely unknown, with most cases lacking identifiable gene mutations.
  • Exosomes, involved in intercellular communication via RNA and protein transfer, are implicated in ALS progression.
  • Exosomal microRNAs (miRNAs) are key regulators of cellular signaling pathways.

Purpose of the Study:

  • To analyze serum-derived exosomal miRNAs in ALS patients compared to healthy controls.
  • To investigate the potential role of exosomal miRNAs in ALS pathogenesis.
  • To identify specific miRNAs or biological pathways associated with ALS.

Main Methods:

  • Serum exosomes were isolated from ALS patients and healthy donors using a commercial kit.
  • miRNAs were purified, reverse transcribed to cDNA, and analyzed using a universal RT miRNA PCR panel.
  • Supervised analysis was performed to compare miRNA expression profiles between groups.

Main Results:

  • An average of 29 miRNAs were detected per sample.
  • No statistically significant differences in miRNA expression were identified between ALS patients and controls.
  • Analysis of samples with high miRNA content revealed six shared biological processes across miRNAs.

Conclusions:

  • The analyzed panel of exosomal miRNAs did not show a strong pathological role in ALS.
  • Further research is necessary to fully understand the contribution of exosome-derived miRNAs to ALS.
  • Identifying biological processes associated with miRNAs may offer future research directions.