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• W2033694695 startingPage "895" @default.
• W2033694695 abstract "Chloride transport involving conductive pathways participates in numerous epithelial functions, such as membrane voltage maintenance, solute transport and cell volume regulation. Evidence points to involvement of transepithelial chloride transport in such functions in placental syncytiotrophoblast. A molecular candidate for physiologic conductive chloride transport in apical syncytiotrophoblast membrane is a Maxi-chloride channel with distinct biophysical properties: conductance over 200 pS, multiple substates, voltage dependent open probability, and permeation to anionic amino acids. Pre-eclampsia, a high incidence pathology of pregnancy, exerts great impact on fetal morbi-mortality. This relies, among others, on intrauterine growth restriction (IUGR), thought to be mediated by diminished blood flow to the placenta, with growing knowledge regarding contribution of other factors. The Maxi-chloride channel's properties suggest it could be altered in this pathology. We have characterized the apical chloride channels from pre-eclamptic placentae, reconstituted in giant liposomes suitable for patch-clamp electrophysiological studies. In n=33 experiments from n=6 pre-eclamptic placentae we observed a chloride-permeable channel with similar biophysical properties to the channel from normal tissue (n=29 experiments from n=15 placentae). However, the main conductance state showed diminished magnitude (<150 pS), and the open probability versus voltage relationship exhibited a flattened curve instead of the bell-shaped curve of normal placentae. These results are the first evidence of a functionally altered ionic channel from placental syncytiotrophoblast in pre-eclampsia. Considering the abundance of chloride-conducting channel activity in human apical membrane and their relevance in epithelial function in general, these alterations could greatly disturb numerous placental functions that rely on syncytiotrophoblast integrity." @default.
• W2033694695 created "2016-06-24" @default.
• W2033694695 creator A5016209013 @default.
• W2033694695 date "2003-10-01" @default.
• W2033694695 modified "2023-10-12" @default.
• W2033694695 title "Large Chloride Channel from Pre-eclamptic Human Placenta" @default.
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• W2033694695 doi "https://doi.org/10.1016/s0143-4004(03)00144-9" @default.
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• W2033694695 hasPublicationYear "2003" @default.
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