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Smooth muscle contraction is a complex process vital for various bodily functions, from maintaining blood vessel tension to facilitating the movement of food through the digestive tract. Unlike striated muscles, smooth muscle contraction begins more slowly and lasts longer.
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In skeletal muscles, acetylcholine is released by nerve terminals at the motor endplate—the point of synaptic communication between motor neurons and muscle fibers. The binding of acetylcholine to its receptors on the sarcolemma allows entry of sodium ions into the cell and triggers an action potential in the muscle cell. Thus, electrical signals from the brain are transmitted to the muscle. Subsequently, the enzyme acetylcholinesterase breaks down acetylcholine to prevent excessive...
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Skeletal muscle fibers have the unique ability to switch between rest and contraction states, using different sources of ATP for energy. The contraction cycle and Ca2+ transport back into the sarcoplasmic reticulum for relaxation require significant ATP. However, the ATP reserves in muscle fibers are limited and can only sustain contractions for a few seconds. Additional ATP production becomes necessary for prolonged contractions. As a result, muscle fibers generate ATP through various sources,...
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Measurement of Smooth Muscle Function in the Isolated Tissue Bath-applications to Pharmacology Research
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Bioengineering functional smooth muscle with spontaneous rhythmic contraction in vitro.

Masae Kobayashi1, Hassan A Khalil2, Nan Ye Lei1,2

  • 1Department of Bioengineering, Henry Samueli School of Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA.

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|September 12, 2018
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Summary

This study developed a novel scaffold to maintain intestinal smooth muscle cells (SMC) and interstitial cells of Cajal (ICC) function in vitro. The engineered system supports rhythmic contractions for over 10 weeks, aiding research in motility disorders and tissue engineering.

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Area of Science:

  • Biomedical Engineering
  • Gastroenterology
  • Tissue Engineering

Background:

  • Intestinal smooth muscle contractions are regulated by interstitial cells of Cajal (ICC), which act as pacemakers.
  • Disruptions in ICC networks are linked to intestinal motility disorders, impacting patient quality of life.
  • Maintaining the function of cultured ICC and smooth muscle cells (SMC) in vitro is a significant challenge for research and tissue engineering.

Purpose of the Study:

  • To develop a novel method for sustaining the in vitro function of intestinal ICC and SMC.
  • To engineer a platform for studying intestinal motility disorders and advancing smooth muscle tissue engineering.

Main Methods:

  • Primary intestinal SMC and ICC mixtures were cultured on electrospun poly(3-caprolactone) scaffolds seeded with feeder cells.
  • The functional integrity of the cultured cells and scaffold construct was assessed over an extended period (over 10 weeks).

Main Results:

  • The engineered constructs demonstrated sustained rhythmic contractions with a clear directionality.
  • Cellular function was maintained in vitro for more than 10 weeks, overcoming typical rapid loss of function.

Conclusions:

  • A novel, simple, and effective system was established to maintain intestinal ICC and SMC function in vitro.
  • This platform holds promise for advancing research into intestinal motility disorders and serves as a versatile tool for smooth muscle tissue engineering.