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Related Concept Videos

Smooth Muscle Contraction01:25

Smooth Muscle Contraction

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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.
The onset of contraction is triggered by an increase in calcium ions within the sarcoplasm, similar to the process in striated muscle. However, smooth muscles have a relatively smaller reservoir of the sarcoplasmic...
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Related Experiment Video

Updated: Aug 20, 2025

Bladder Smooth Muscle Strip Contractility as a Method to Evaluate Lower Urinary Tract Pharmacology
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Formation of Double Stranded RNA Provokes Smooth Muscle Contractions and Structural Modifications in Bladder

Jing-Hua Yang1, Zuohui Zhao2, Wanting Niu3

  • 1Department of Surgery, Boston University School of Medicine and Proteomics Laboratory, VA Boston Healthcare System, Boston, MA, USA.

Research and Reports in Urology
|November 23, 2022
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Summary

Double stranded RNA (dsRNA) forms in the bladder during ischemia, increasing smooth muscle contractions and causing cell damage. Targeting this stress response molecule may treat overactive bladder conditions.

Keywords:
bladdercontractiondegenerationdsRNAischemiaoveractivity

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Area of Science:

  • Urology
  • Cellular Biology
  • Ischemia Research

Background:

  • Ischemia can cause bladder dysfunction, including detrusor overactivity and degenerative changes.
  • Mechanisms involve hypoxia, redox, and cellular stress pathways, but downstream effectors are unclear.

Purpose of the Study:

  • To investigate the role of double stranded RNA (dsRNA), a redox-induced stress molecule, in ischemia-mediated bladder dysfunction.

Main Methods:

  • Used rat pelvic ischemia and cell culture hypoxia models.
  • Assessed dsRNA expression, function, and structure via RT-PCR, Western blotting, histology, and organ bath studies.

Main Results:

  • First evidence of dsRNA formation in overactive bladders.
  • Ischemia provokes dsRNA production, augmenting smooth muscle contractions and promoting fibrotic/apoptotic responses.
  • dsRNA may upregulate protein kinase R (PKR) and caspase-3.

Conclusions:

  • The dsRNA/PKR pathway may sensitize bladder smooth muscle cells.
  • dsRNA and caspase-3 crosstalk contribute to cellular stress and degenerative changes in ischemic bladders.
  • dsRNA plays a role in bladder dysfunction, offering therapeutic targets for overactivity and structural damage.