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Related Concept Videos

Enzyme Kinetics01:19

Enzyme Kinetics

Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
Introduction to Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
The experimenter can then plot the initial reaction rate or velocity (Vo) of a given trial against the substrate concentration ([S]) to obtain a graph of the reaction properties. For many enzymatic reactions involving a...

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Updated: May 13, 2026

Isolation of Skeletal Muscle Satellite Cells for In Vitro Myogenesis Studies
07:56

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Published on: February 24, 2026

Substrate elasticity affects bovine satellite cell activation kinetics in vitro.

M R Lapin1, J M Gonzalez, S E Johnson

  • 1Department of Animal Sciences, University of Florida, Gainesville, FL 32611, USA.

Journal of Animal Science
|March 7, 2013
PubMed
Summary

Hepatocyte growth factor (HGF) and muscle elasticity influence bovine satellite cell (BSC) activation. Stiffer surfaces promote BSC activation, while HGF enhances it on pliable scaffolds, revealing key signals for muscle stem cell regulation.

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Area of Science:

  • Muscle biology
  • Cellular and molecular biology
  • Biophysics

Background:

  • Satellite cells are crucial for skeletal muscle growth and repair.
  • Their activation is influenced by niche factors, but the role of tissue elasticity is less understood.
  • Understanding these interactions is key to muscle regeneration and hypertrophy.

Purpose of the Study:

  • To investigate the combined effects of hepatocyte growth factor (HGF) and surface elasticity on bovine satellite cell (BSC) activation.
  • To determine how biophysical properties of the muscle microenvironment impact satellite cell response.
  • To elucidate the interplay between mechanical cues and growth factors in regulating muscle stem cells.

Main Methods:

  • Elasticity of semimembranosus and LM muscles from young and adult cattle was measured.
  • Bovine satellite cells were cultured on biomimetic polyacrylamide gels with varying elasticity.
  • Cells were treated with HGF or vehicle, and activation was assessed via PCNA and Pax7 immunocytochemistry.

Main Results:

  • Muscle elasticity decreased with age in LM but not SM.
  • BSC on rigid surfaces activated readily and were unresponsive to HGF.
  • HGF promoted BSC activation on pliable scaffolds, and increased elasticity correlated with more muscle progenitors.

Conclusions:

  • Both biophysical (elasticity) and biochemical (HGF) signals regulate BSC activation.
  • Surface elasticity and HGF interact to control muscle stem cell behavior.
  • These findings have implications for understanding muscle hypertrophy and regenerative medicine.