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Related Concept Videos

Formation of Muscle Fibers from Myoblasts01:13

Formation of Muscle Fibers from Myoblasts

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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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
Ribosome Profiling02:24

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Ribosomal RNA Synthesis02:53

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Cellular Adaptation II: Hypertrophy

Hypertrophy is the increase in the size of individual cells, resulting in the enlargement of a tissue or organ. Unlike hyperplasia, which involves an increase in cell number, hypertrophy is characterized by an increase in cell volume. This process often occurs in response to higher functional demand or hormonal stimulation, leading to the production of more structural proteins and organelles, thereby enhancing the cells' work capacity.There are two primary types of hypertrophy: physiological...
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Related Experiment Video

Updated: Jun 12, 2026

Isolation and Differentiation of Primary Myoblasts from Mouse Skeletal Muscle Explants
06:53

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Published on: October 15, 2019

Ribosome Biogenesis as a Putative Bottleneck to Skeletal Muscle Hypertrophy: Mechanisms, Human Evidence, and

Mario Muñoz López1, José Francisco López-Gil2,3, Xabier Ramírez de la Piscina Viúdez1

  • 1Department of Sport Sciences, Faculty of Sport and Health Sciences, Fit Generation Research Institute, AD500 Andorra la Vella, Andorra.

Cells
|June 11, 2026
PubMed
Summary

Skeletal muscle growth depends on building more ribosomes, not just signaling. Enhancing ribosome production is key for muscle hypertrophy and treating muscle loss.

Keywords:
RNA Polymerase Imechanotransductionnucleolusresistance trainingribosome biogenesisskeletal muscle hypertrophytranslational capacity

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Last Updated: Jun 12, 2026

Isolation and Differentiation of Primary Myoblasts from Mouse Skeletal Muscle Explants
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Area of Science:

  • Molecular Biology
  • Exercise Physiology
  • Cellular Adaptation

Background:

  • Muscle hypertrophy traditionally linked to mTORC1 signaling.
  • Sustained growth correlates with expansion of translational machinery.
  • Ribosome synthesis is crucial for long-term protein accretion.

Purpose of the Study:

  • Review ribosome biogenesis as a bottleneck in muscle adaptation.
  • Differentiate acute signaling from chronic translational capacity.
  • Examine factors influencing structural adaptation in skeletal muscle.

Main Methods:

  • Dissection of nucleolar expansion mechanisms.
  • Analysis of methodological pitfalls in RNA normalization.
  • Synthesis of in vivo human evidence on muscle adaptation.

Main Results:

  • Moving denominator paradox underestimates ribosomal accretion.
  • Age, training, and volume modulate structural capacity.
  • High-responder phenotype linked to nucleolar adaptation.

Conclusions:

  • Acute signaling is permissive; capacity is key for hypertrophy.
  • Overcoming translational bottlenecks drives adaptation.
  • Focus on nucleolar expansion redefines hypertrophy and sarcopenia interventions.