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Nagaraj, C; Li, Y; Tang, B; Bordag, N; Guntur, D; Enyedi, P; Olschewski, H; Olschewski, A.
Potassium Channels in the Transition from Fetal to the Neonatal Pulmonary Circulation.
Int J Mol Sci. 2022; 23(9): Doi: 10.3390/ijms23094681 [OPEN ACCESS]
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Leading authors Med Uni Graz: Chandran Nagaraj; Olschewski Andrea
Co-authors Med Uni Graz: Bordag Natalie; Guntur Divya; Olschewski Horst; Tang Bi
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Abstract:: The transition from the fetal to the neonatal circulation includes dilatation of the pulmonary arteries (PA) and closure of the Ductus Arteriosus Botalli (DAB). The resting membrane potential and various potassium channel activities in smooth muscle cells (SMC) from fetal and neonatal PA and DAB obtained from the same species has not been systematically analyzed. The key issue addressed in this paper is how the resting membrane potential and the whole-cell potassium current (IK) change when PASMC or DABSMC are transitioned from hypoxia, reflecting the fetal state, to normoxia, reflecting the post-partal state. Patch-clamp measurements were employed to characterize whole-cell K⁺ channel activity in fetal and post-partal (newborn) PASMC and DABSMC. The main finding of this paper is that the SMC from both tissues use a similar set of K⁺ channels (voltage-dependent (Kv), calcium-sensitive (KCa), TASK-1 and probably also TASK-2 channels); however, their activity level depends on the cell type and the oxygen level. Furthermore, we provide the first evidence for pH-sensitive non-inactivating K⁺ current in newborn DABSMC and PASMC, suggesting physiologically relevant TASK-1 and TASK-2 channel activity, the latter particularly in the Ductus Arteriosus Botalli.
Find related publications in this database (using NLM MeSH Indexing): Animals - administration & dosage; Ductus Arteriosus - metabolism; Fetal Development - physiology; Humans - administration & dosage; Infant, Newborn - administration & dosage; Muscle, Smooth, Vascular - metabolism; Potassium Channels - metabolism; Pulmonary Artery - metabolism; Pulmonary Circulation - physiology; Rats - administration & dosage
Find related publications in this database (Keywords): fetal circulation; smooth muscle cells; pulmonary artery; ductus arteriosus; TASK-1; pH-sensitivity; patch-clamp