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Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
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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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Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential;...
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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Normal muscle structure, growth, development, and regeneration.

Wladimir Bocca Vieira de Rezende Pinto1, Paulo Victor Sgobbi de Souza, Acary Souza Bulle Oliveira

  • 1Division of Neuromuscular Diseases, Department of Neurology and Neurosurgery, Federal University of São Paulo (UNIFESP), Estado de Israel Street, 899. Vila Clementino, São Paulo, SP, 04022-002, Brazil, wladimirbvrpinto@gmail.com.

Current Reviews in Musculoskeletal Medicine
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Summary

This review details skeletal muscle structure, function, and regeneration. It covers genetic regulation of muscle development and repair, crucial for understanding myopathies.

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Area of Science:

  • Biochemistry
  • Physiology
  • Genetics

Background:

  • Extensive knowledge exists on skeletal muscle biochemical, structural, and physiological properties.
  • Muscle disorders, including acquired and hereditary myopathies, are common in clinical practice.
  • Understanding normal muscle architecture and function is key to diagnosing myopathies.

Purpose of the Study:

  • To provide an extensive literature review on skeletal muscle cell structure and function.
  • To describe embryological and regenerative processes linked to muscle lesions.
  • To offer an updated description of nuclear genomic regulatory mechanisms in muscle regeneration and embryogenesis.

Main Methods:

  • Literature review
  • Synthesis of current knowledge
  • Comprehensive description of genetic regulatory mechanisms

Main Results:

  • Detailed overview of muscle cell biology.
  • Explanation of muscle development and repair processes.
  • Focus on genetic control of muscle regeneration.

Conclusions:

  • Current knowledge provides a strong foundation for understanding muscle disorders.
  • Genetic mechanisms play a critical role in muscle embryogenesis and regeneration.
  • This review consolidates current understanding for clinical and research applications.