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- W2127281632 abstract "We characterized inward rectifier (KIR) currents in reactive astrocytes activated by CNS injury. We used primary cultures of reactive astrocytes obtained from gelatin sponge implants in adult rat brains, a system that yielded highly purified, homogeneous cultures with >95% of cells positive for GFAP, vimentin, and S-100β. Ionic channels were studied in 1–21-day-old primary cultures using a nystatin-perforated patch clamp technique. Fast Na+ currents were identified in <2% of cells. Most cells exhibited outward currents positive to −50 mV, with one component being sensitive to charybdotoxin, iberiotoxin, and tetraethylammonium chloride, and another component being sensitive to 4-aminopyridine. Two populations of cells were distinguished, based on presence or absence of Ba2+-sensitive KIR current negative to the K+ reversal potential (Ek), with >80% of cells expressing KIR currents. In contrast to previous reports on mammalian astrocytes, the current-voltage curve showed no appreciable current between Ek and −50 mV, reflecting strong rectification by KIR channels. The magnitude of KIR current at −130 mV (I−130) did not change significantly during 21 days in culture (123 cells), suggesting constitutive expression of KIR channels. The fraction of KIR-negative cells was not affected by serum-starvation for 16–24 h. In cells with I−130 ≥ −30 pA, the membrane potential was invariably near Ek and depolarized appreciably on addition of Ba2+, but in cells with I−130 < −30 pA, resting potentials ranged from −40 mV to −90 mV. We conclude that most adult reactive astrocytes constitutively express KIR channel(s) that exhibit strong rectification not previously observed in mammalian astrocytes. GLIA 27:213–225, 1999. © 1999 Wiley-Liss, Inc." @default.
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- W2127281632 date "1999-09-01" @default.
- W2127281632 modified "2023-10-11" @default.
- W2127281632 title "K+ inward rectifier currents in reactive astrocytes from adult rat brain" @default.
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- W2127281632 doi "https://doi.org/10.1002/(sici)1098-1136(199909)27:3<213::aid-glia3>3.0.co;2-1" @default.
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