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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.
Muscle progenitor cells (MPCs) are formed from the myotomes. MPCs express genes that encode the transcription factors Pax3 and Pax7. Along with Pax 3/7, other transcription factors...
Satellite Stem Cells and Muscular Dystrophy01:21

Satellite Stem Cells and Muscular Dystrophy

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...
Exercise and Muscle Performance01:27

Exercise and Muscle Performance

Exercise induces a range of adaptations in muscle tissue, depending on the type and duration of activity. Such physical training can be broadly categorized into two types: endurance exercises and resistance exercises.
Endurance exercises
Endurance exercises involve running, swimming, or cycling, which require repetitive movements with low force output. When a person engages in endurance exercise, a few noticeable changes occur in their skeletal muscles. For instance, the number of capillaries...
The Role of Actin and Myosin in Non-muscle Cells01:10

The Role of Actin and Myosin in Non-muscle Cells

Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
Cross-bridge Cycle01:26

Cross-bridge Cycle

As muscle contracts, the overlap between the thin and thick filaments increases, decreasing the length of the sarcomere—the contractile unit of the muscle—using energy in the form of ATP. At the molecular level, this is a cyclic, multistep process that involves binding and hydrolysis of ATP, and movement of actin by myosin.

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Related Experiment Video

Updated: Jun 21, 2026

Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement
10:45

Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement

Published on: July 26, 2017

Myostatin Signaling in Skeletal Muscle: Implications for Athletic Performance.

Srishti Chandel1, Deenathayalan Uvarajan2, Mahalaxmi Iyer3,4

  • 1Department of Physical Education, Human Performance Laboratory, Central University of Punjab, Bathinda, India.

Comprehensive Physiology
|June 20, 2026
PubMed
Summary
This summary is machine-generated.

Myostatin (MSTN) regulates muscle growth; inhibiting it enhances muscle regeneration and metabolic function. Genetic variations in MSTN influence athletic performance and muscle traits, offering insights for sports genomics.

Keywords:
IGF‐1 signalingathletic performancegenetic polymorphismmuscle hypertrophymyostatinskeletal muscle regulationsports geneticstestosterone interaction

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Last Updated: Jun 21, 2026

Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement
10:45

Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement

Published on: July 26, 2017

Preparation of Primary Myogenic Precursor Cell/Myoblast Cultures from Basal Vertebrate Lineages
07:51

Preparation of Primary Myogenic Precursor Cell/Myoblast Cultures from Basal Vertebrate Lineages

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

Isolation and Differentiation of Primary Myoblasts from Mouse Skeletal Muscle Explants

Published on: October 15, 2019

Area of Science:

  • Muscle Biology
  • Genetics
  • Sports Science

Background:

  • Myostatin (MSTN) is a key negative regulator of skeletal muscle mass.
  • It influences satellite cell activity and protein synthesis via Smad and non-Smad pathways.
  • MSTN signaling impacts metabolic function, insulin sensitivity, and musculoskeletal adaptation.

Purpose of the Study:

  • To provide an integrated overview of myogenesis and MSTN signaling.
  • To explore the role of MSTN genetic variations in athletic performance.
  • To discuss therapeutic strategies and future research in muscle biology and sports genomics.

Main Methods:

  • Literature review of myogenesis, MSTN signaling pathways, and genetic polymorphisms.
  • Analysis of MSTN's role in muscle hypertrophy, inflammation, and sports performance.
  • Discussion of endocrine interactions and therapeutic modulation strategies.

Main Results:

  • Reduced myostatin activity promotes muscle regeneration and protein synthesis, partly via the IGF-1/Akt/mTOR pathway.
  • Genetic variations in MSTN, ACVR2A, and ACVR2B are linked to differences in muscle morphology and athletic performance.
  • Specific polymorphisms (e.g., rs1805086, rs11333758) correlate with muscle strength, hypertrophy, and endurance.

Conclusions:

  • MSTN signaling is crucial for skeletal muscle homeostasis and athletic performance.
  • Genetic factors influencing MSTN activity contribute to inter-individual variability in muscle traits.
  • Understanding MSTN pathways and genetics offers potential for therapeutic interventions and precision sports genomics.