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Article Dans Une Revue American Journal of Respiratory Cell and Molecular Biology Année : 2002

Characterization of ion and fluid transport in human bronchioles.

Résumé

The regulation of the volume and composition of airway surface liquid is achieved through epithelial ion transport processes. In humans, these processes have been characterized in proximal but not distal airways. Segments of human bronchioles were dissected from surgically removed lung pieces. The transmural potential difference of microperfused bronchioles was inhibited by luminal exposure to amiloride and increased when exposed to the Cl secretagogues forskolin and ATP in the presence of amiloride. Human bronchiolar epithelial cells were cultured on permeable supports and studied in Ussing chambers. They generated a short circuit current (Isc) that decreased in response to amiloride and increased in response to forskolin and to ATP in the presence of amiloride. In low-Cl Kreb's Ringer bicarbonate, the baseline Isc and amiloride-induced decrease in Isc were not different, whereas the forskolin- and ATP-induced increases in Isc were smaller. Fluid transport measurement in excised bronchioles revealed a basal absorptive flow that was reduced by amiloride, whereas forskolin and ATP combined induced a secretory flow in the presence of amiloride. We conclude that human bronchioles actively absorb Na and fluid in unstimulated conditions and are capable of active Cl and fluid secretion when exposed to forskolin and to ATP.
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Dates et versions

inserm-00150306 , version 1 (30-05-2007)

Identifiants

  • HAL Id : inserm-00150306 , version 1
  • PUBMED : 12356585

Citer

Sabine Blouquit, Hugues Morel, Jocelyne Hinnrasky, Emmanuel Naline, Edith Puchelle, et al.. Characterization of ion and fluid transport in human bronchioles.. American Journal of Respiratory Cell and Molecular Biology, 2002, 27 (4), pp.503-10. ⟨inserm-00150306⟩

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