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Kit-negative fibroblast-like cells expressing SK3, a Ca2+-activated K+ channel, in the gut musculature in health and disease

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • Jean-Marie Vanderwinden
  • Jüri J Rumessen
  • Alban de Kerchove d'Exaerde
  • Karine Gillard
  • Jean-Jacques Panthier
  • Marc-Henri de Laet
  • Serge N Schiffmann
The apamin-sensitive component of the inhibitory response of the gastrointestinal musculature involves the small conductance Ca(2+)-activated K(+) channel SK3. Kit-immunoreactive (ir) interstitial cells of Cajal appear to be involved in nitrergic inhibition while the role of the recently described CD34-ir fibroblast-like cells adjacent to, but distinct from, the cells of Cajal remains elusive. The distribution of SK3 was studied by immunohistochemistry in the normal human gut, in motility disorders with a lack of cells of Cajal (infantile hypertrophic pyloric stenosis and Hirschsprung's disease) and in mice deficient in cells of Cajal. SK3 immunoreactivity was observed exclusively in Kit-negative interstitial cells adjacent to, but distinct from, the Kit-ir interstitial cells of Cajal in the normal gut. The distribution of SK3-ir cells was not altered in conditions where cells of Cajal were lacking. These cells were CD34-ir fibroblast-like cells in the human gut and in the mouse stomach, while SK3-ir cells in the mouse intestine were CD34 negative. As SK channels are reportedly involved in inhibitory neurotransmission, our morphological observations suggest that SK3-ir interstitial cells, distinct from the Kit-ir interstitial cells of Cajal, may represent a novel cellular component in the control of excitability of the digestive musculature. Further studies will be required to directly address the function of these cells.
OriginalsprogEngelsk
TidsskriftCell and Tissue Research
Vol/bind310
Udgave nummer3
Sider (fra-til)349-58
Antal sider10
ISSN0302-766X
DOI
StatusUdgivet - dec. 2002

ID: 48565181