Related Experiment Video

Updated: Oct 13, 2026

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

Published on: April 30, 2014

Myostatin, a negative regulator of muscle growth, functions by inhibiting myoblast proliferation

M Thomas1, B Langley, C Berry

  • 1nimal Genomics, AgResearch, Private Bag 3123, East St., Hamilton 2001, New Zealand.

The Journal of Biological Chemistry
|September 8, 2000
PubMed

Insights

Myostatin inhibits muscle precursor cell proliferation by arresting them in the G1 phase of the cell cycle. This occurs through increased p21 expression and decreased Cdk2 activity, impacting Rb protein phosphorylation.

Area of Science:

  • Muscle biology
  • Cell cycle regulation
  • Molecular signaling

Background:

  • Myostatin, a TGF-beta superfamily member, negatively regulates myogenesis.
  • Understanding myostatin's precise mechanism in muscle development is crucial.

Purpose of the Study:

  • To elucidate the role of myostatin in controlling muscle precursor cell proliferation.
  • To investigate the molecular pathways by which myostatin affects the cell cycle.

Main Methods:

  • Incubation of C(2)C(12) myoblasts with varying concentrations of myostatin.
  • Fluorescence-activated cell sorting (FACS) analysis for cell cycle progression.
  • Western blot analysis to assess protein levels and activity (p21, Cdk2, Rb).

Main Results:

  • Myostatin significantly decreased myoblast proliferation in a dose-dependent manner.
  • Myostatin treatment led to cell cycle arrest at the G1 to S-phase transition.
  • Key molecular changes included upregulation of p21(Waf1, Cip1), downregulation of Cdk2, and accumulation of hypophosphorylated Rb protein.

Conclusions:

  • Myostatin enforces G1 cell cycle arrest in myoblasts via p21 and Cdk2 regulation.
  • This mechanism explains how myostatin controls muscle precursor cell proliferation.
  • Disruption of this pathway may underlie the muscular hyperplasia observed in myostatin-deficient states.

More Related Videos

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue06:59

Isolation of Primary Myofibroblasts from Mouse and Human Colon Tissue

Published on: October 12, 2013

Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement10:45

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

Published on: July 26, 2017

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...
Master Transcription Regulators02:23

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
Cells Coordinate Growth and Proliferation02:36

Cells Coordinate Growth and Proliferation

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,...
Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.