Ion transport in epithelial spheroids derived from human airway cells.

TY - JOUR

T1 - Ion transport in epithelial spheroids derived from human airway cells.

AU - Pedersen, P S

AU - Frederiksen, O

AU - Holstein-Rathlou, N H

AU - Larsen, P L

AU - Qvortrup, K

N1 - Keywords: Absorption; Adenosine Triphosphate; Amiloride; Anthranilic Acids; Biological Transport; Chlorides; Cyclic AMP; Cystic Fibrosis; Electrophysiology; Epithelium; Female; Humans; Hydrocortisone; Ions; Male; Nasal Polyps; Sodium; Spheroids, Cellular

PY - 1999

Y1 - 1999

N2 - In the present study, we describe a novel three-dimensional airway epithelial explant preparation and demonstrate its use for ion transport studies by electrophysiological technique. Suspension cultures of sheets of epithelial cells released by protease treatment from cystic fibrosis (CF) and non-CF nasal polyps developed free-floating, monolayered epithelial spheres, with the apical, ciliated cell membrane facing the bath and the basolateral cell membrane pointing toward a fluid-filled lumen. Microelectrode impalement of both non-CF and CF spheroids revealed lumen-positive transepithelial electrical potential differences (PDs) that were inhibited by amiloride, indicating that the spheroids were inflated due to amiloride-sensitive Na+ absorption followed by water. Transformation to a Cl- secretory state was achieved by addition of ATP to the bath, leading to the development of a diphenylamine-2-carboxylate-sensitive PD. A cAMP-induced increase in PD was seen in non-CF spheroids only. In response to hydrocortisone treatment, Na+ transport reflected by amiloride-sensitive PD increased and more so in CF than in non-CF spheres. We concluded that this preparation is a useful model for the airway surface epithelium and is suitable for studies of transport mechanisms and regulation.

AB - In the present study, we describe a novel three-dimensional airway epithelial explant preparation and demonstrate its use for ion transport studies by electrophysiological technique. Suspension cultures of sheets of epithelial cells released by protease treatment from cystic fibrosis (CF) and non-CF nasal polyps developed free-floating, monolayered epithelial spheres, with the apical, ciliated cell membrane facing the bath and the basolateral cell membrane pointing toward a fluid-filled lumen. Microelectrode impalement of both non-CF and CF spheroids revealed lumen-positive transepithelial electrical potential differences (PDs) that were inhibited by amiloride, indicating that the spheroids were inflated due to amiloride-sensitive Na+ absorption followed by water. Transformation to a Cl- secretory state was achieved by addition of ATP to the bath, leading to the development of a diphenylamine-2-carboxylate-sensitive PD. A cAMP-induced increase in PD was seen in non-CF spheroids only. In response to hydrocortisone treatment, Na+ transport reflected by amiloride-sensitive PD increased and more so in CF than in non-CF spheres. We concluded that this preparation is a useful model for the airway surface epithelium and is suitable for studies of transport mechanisms and regulation.

M3 - Journal article

C2 - 9887058

SN - 0002-9513

VL - 276

SP - L75-80

JO - American Journal of Physiology

JF - American Journal of Physiology

IS - 1 Pt 1

ER -