Interference of a short-chain phospholipid with ion transport pathways in frog skin
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Interference of a short-chain phospholipid with ion transport pathways in frog skin. / Unmack, M A; Frederiksen, O; Willumsen, N J.
In: Pflügers Archiv: European Journal of Physiology, Vol. 434, No. 3, 1997, p. 234-41.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Interference of a short-chain phospholipid with ion transport pathways in frog skin
AU - Unmack, M A
AU - Frederiksen, O
AU - Willumsen, N J
N1 - Keywords: Animals; Chlorides; Electric Conductivity; Female; Ion Transport; Kinetics; Male; Phosphatidylcholines; Rana temporaria; Skin; Sodium; Sodium Channel Blockers; Sodium Channels; Sucrose
PY - 1997
Y1 - 1997
N2 - The effects of mucosal application of the short-chain phospholipid didecanoyl-L-alpha-phosphatidylcholine (DDPC; with two saturated 10-carbon acyl chains) on active Na+ transport and transepithelial conductance (G) in the frog skin (Rana temporaria) were investigated. Active Na+ transport was measured as the amiloride-sensitive short-circuit current (ISC) and G was determined from transepithelial voltage-clamp pulses under short-circuit conditions. DDPC dose-dependently inhibited ISC with an ID50 of about 0.05% (w/v) and a maximal effect ( approximately 55%) at >/= 1% DDPC. G increased to steady-state values above control level. Simultaneously, equal increases in unidirectional sucrose permeabilities (PSu; measured from [14C]sucrose fluxes) were observed, and a positive correlation was demonstrated between DDPC-induced changes in PSu and G. Since amiloride did not prevent the increase in G by DDPC, these results suggest that the DDPC-induced increase in G represents an increase in the paracellular shunt conductance. The effects of mucosal DDPC were almost fully reversible within 8 h. The results indicate that DDPC inhibits amiloride-sensitive Na+ channels in the apical membrane of the frog skin epithelium and opens a paracellular tight junction pathway. Both effects may be caused by incorporation of DDPC in the apical cell membrane.
AB - The effects of mucosal application of the short-chain phospholipid didecanoyl-L-alpha-phosphatidylcholine (DDPC; with two saturated 10-carbon acyl chains) on active Na+ transport and transepithelial conductance (G) in the frog skin (Rana temporaria) were investigated. Active Na+ transport was measured as the amiloride-sensitive short-circuit current (ISC) and G was determined from transepithelial voltage-clamp pulses under short-circuit conditions. DDPC dose-dependently inhibited ISC with an ID50 of about 0.05% (w/v) and a maximal effect ( approximately 55%) at >/= 1% DDPC. G increased to steady-state values above control level. Simultaneously, equal increases in unidirectional sucrose permeabilities (PSu; measured from [14C]sucrose fluxes) were observed, and a positive correlation was demonstrated between DDPC-induced changes in PSu and G. Since amiloride did not prevent the increase in G by DDPC, these results suggest that the DDPC-induced increase in G represents an increase in the paracellular shunt conductance. The effects of mucosal DDPC were almost fully reversible within 8 h. The results indicate that DDPC inhibits amiloride-sensitive Na+ channels in the apical membrane of the frog skin epithelium and opens a paracellular tight junction pathway. Both effects may be caused by incorporation of DDPC in the apical cell membrane.
U2 - 10.1007/s004240050390
DO - 10.1007/s004240050390
M3 - Journal article
C2 - 9178620
VL - 434
SP - 234
EP - 241
JO - Pflügers Archiv - European Journal of Physiology
JF - Pflügers Archiv - European Journal of Physiology
SN - 0031-6768
IS - 3
ER -
ID: 15763917