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Microscopic Anatomy of Skeletal Muscles01:13

Microscopic Anatomy of Skeletal Muscles

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Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
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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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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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Satellite Stem Cells and Muscular Dystrophy01:21

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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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Exercise, Skeletal Muscle and Circulating microRNAs.

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Area of Science:

  • Exercise Physiology
  • Molecular Biology
  • Biochemistry

Background:

  • Regular exercise drives crucial adaptations in skeletal muscle for lifelong health and chronic disease prevention.
  • Molecular biology and exercise physiology have identified key signaling pathways in exercise-induced adaptations.
  • Noncoding RNAs, particularly microRNAs (miRNAs), represent a novel regulatory layer in these adaptations.

Purpose of the Study:

  • To provide an overview of current research on the role of miRNAs in exercise-induced skeletal muscle adaptations.
  • To highlight the strengths and limitations of existing research in the exercise-miRNA field.
  • To suggest future research directions in the study of miRNAs and exercise.

Main Methods:

  • Review of current scientific literature on miRNAs and exercise-induced adaptations.
  • Analysis of miRNA regulatory mechanisms, including mRNA targeting and protein translation inhibition.
  • Examination of miRNA expression in skeletal muscle and circulation.

Main Results:

  • miRNAs bind to messenger RNAs (mRNAs), leading to mRNA degradation or translation inhibition.
  • Specific miRNAs are enriched in skeletal muscle, while others are ubiquitously expressed.
  • Circulating miRNAs are stable and may serve as biomarkers for disease conditions.

Conclusions:

  • miRNAs play a significant role in mediating skeletal muscle adaptations to exercise.
  • Further research is needed to fully elucidate the function and therapeutic potential of miRNAs in exercise science.
  • The field of exercise and miRNAs is rapidly evolving, with potential for biomarker discovery and targeted interventions.