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2015 ; 3
(9
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Airway surface liquid volume expansion induces rapid changes in
amiloride-sensitive Na+ transport across upper airway epithelium-Implications
concerning the resolution of pulmonary edema
#MMPMID26333829
Azizi F
; Arredouani A
; Mohammad RM
Physiol Rep
2015[Sep]; 3
(9
): ä PMID26333829
show ga
During airway inflammation, airway surface liquid volume (ASLV) expansion may
result from the movement of plasma proteins and excess liquid into the airway
lumen due to extravasation and elevation of subepithelial hydrostatic pressure.
We previously demonstrated that elevation of submucosal hydrostatic pressure
increases airway epithelium permeability resulting in ASLV expansion by
500 ?L cm(-2) h(-1). Liquid reabsorption by healthy airway epithelium is
regulated by active Na(+) transport at a rate of 5 ?L cm(-2) h(-1). Thus, during
inflammation the airway epithelium may be submerged by a large volume of luminal
liquid. Here, we have investigated the mechanism by which ASLV expansion alters
active epithelial Na(+) transport, and we have characterized the time course of
the change. We used primary cultures of tracheal airway epithelium maintained
under air interface (basal ASLV, depth is 7 ± 0.5 ?m). To mimic airway flooding,
ASLV was expanded to a depth of 5 mm. On switching from basal to expanded ASLV
conditions, short-circuit current (Isc, a measure of total transepithelial active
ion transport) declined by 90% with a half-time (t1/2) of 1 h. 24 h after the
switch, there was no significant change in ATP concentration nor in the number of
functional sodium pumps as revealed by [(3)H]-ouabain binding. However,
amiloride-sensitive uptake of (22)Na(+) was reduced by 70% upon ASLV expansion.
This process is reversible since after returning cells back to air interface, Isc
recovered with a t1/2 of 5-10 h. These results may have important clinical
implications concerning the development of Na(+) channels activators and
resolution of pulmonary edema.