TY - JOUR
T1 - Changes in inward rectifier K+ channels in hepatic stellate cells during primary culture
AU - Lee, Dong Hyeon
AU - Kong, In Deok
AU - Lee, Joong Woo
AU - Park, Kyu Sang
PY - 2008/6
Y1 - 2008/6
N2 - Purpose: This study examined the expression and function of inward rectifier K+ channels in cultured rat hepatic stellate cells (HSC). Materials and Methods: The expression of inward rectifier K- channels was measured using real-time RT-PCR, and electrophysiological properties were determined using the gramicidin-perforated patch-clamp technique. Results: The dominant inward rectifier K+ channel subtypes were Kir2.1 and Kir6.1. These dominant K+ channel subtypes decreased significantly during the primary culture throughout activation process. HSC can be classified into two subgroups: one with an inward-rectifying K+ current (type 1) and the other without (type 2). The inward current was blocked by Ba2+ (100 μM) and enhanced by high K- (140 mM), more prominently in type 1 HSC. There was a correlation between the amplitude of the Ba2--sensitive current and the membrane potential. In addition, Ba2+ (300 μM) depolarized the membrane potential. After the culture period, the amplitude of the inward current decreased and the membrane potential became depolarized. Conclusion: HSC express inward rectifier K+ channels, which physiologically regulate membrane potential and decrease during the activation process. These results will potentially help determine properties of the inward rectifier K+ channels in HSC as well as their roles in the activation process.
AB - Purpose: This study examined the expression and function of inward rectifier K+ channels in cultured rat hepatic stellate cells (HSC). Materials and Methods: The expression of inward rectifier K- channels was measured using real-time RT-PCR, and electrophysiological properties were determined using the gramicidin-perforated patch-clamp technique. Results: The dominant inward rectifier K+ channel subtypes were Kir2.1 and Kir6.1. These dominant K+ channel subtypes decreased significantly during the primary culture throughout activation process. HSC can be classified into two subgroups: one with an inward-rectifying K+ current (type 1) and the other without (type 2). The inward current was blocked by Ba2+ (100 μM) and enhanced by high K- (140 mM), more prominently in type 1 HSC. There was a correlation between the amplitude of the Ba2--sensitive current and the membrane potential. In addition, Ba2+ (300 μM) depolarized the membrane potential. After the culture period, the amplitude of the inward current decreased and the membrane potential became depolarized. Conclusion: HSC express inward rectifier K+ channels, which physiologically regulate membrane potential and decrease during the activation process. These results will potentially help determine properties of the inward rectifier K+ channels in HSC as well as their roles in the activation process.
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U2 - 10.3349/ymj.2008.49.3.459
DO - 10.3349/ymj.2008.49.3.459
M3 - Article
C2 - 18581597
AN - SCOPUS:48649083950
VL - 49
SP - 459
EP - 471
JO - Yonsei Medical Journal
JF - Yonsei Medical Journal
SN - 0513-5796
IS - 3
ER -