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Related Experiment Videos

Pacemaker activity in the upper urinary tract.

Robert M Weiss1, Frank J Tamarkin, Marcia A Wheeler

  • 1Section of Urology, Yale University School of Medicine, New Haven, Conneticut 06520-8041, USA. robert.weiss@yale.edu

Journal of Smooth Muscle Research = Nihon Heikatsukin Gakkai Kikanshi
|November 14, 2006
PubMed
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Ureteral peristalsis originates from specialized pacemaker cells in the upper urinary tract. These cells generate electrical activity, driving coordinated contractions essential for urine transport.

Area of Science:

  • Urology
  • Physiology
  • Developmental Biology

Background:

  • Ureteral peristalsis is crucial for urine transport from the kidneys to the bladder.
  • The cellular mechanisms and origins of ureteral electrical activity remain incompletely understood.

Purpose of the Study:

  • To investigate the cellular basis of electrical activity in ureteral pacemaker sites.
  • To explore the role of c-Kit expression in the development of ureteral peristalsis.

Main Methods:

  • Electrophysiological recordings from ureteral smooth muscle cells.
  • Immunohistochemical analysis for alpha-smooth muscle actin and c-Kit expression.
  • Investigation of sensory afferent and neurochemical involvement.

Main Results:

Related Experiment Videos

  • Identified 'atypical' smooth muscle cells in proximal ureter as pacemaker sites.
  • Pacemaker cells exhibit distinct electrophysiological properties and reduced contractile filament content compared to typical smooth muscle cells.
  • c-Kit expression correlates with the development of organized ureteral peristalsis.
  • Capsaicin-sensitive afferents and tachykinins/prostaglandins are implicated in peristalsis maintenance.

Conclusions:

  • Specialized pacemaker cells, distinct from typical smooth muscle, initiate ureteral peristalsis.
  • c-Kit signaling is vital for the embryonic development of coordinated ureteral contractions.
  • Neurochemical pathways modulate established ureteral function.