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• W1998597100 abstract "Pseudomonas fluorescens is a Gram-negative bacillus closely related to the pathogen P. aeruginosa known to provoke infectious disorders in the central nervous system (CNS). The endotoxin lipopolysaccharide (LPS) expressed by the bacteria is the first infectious factor that can interact with the plasma membrane of host cells. In the present study, LPS extracted from P. fluorescens MF37 was examined for its actions on delayed rectifier and A-type K+ channels, two of the main types of voltage-activated K+ channels involved in the action potential firing. Current recordings were performed in cultured rat cerebellar granule neurons at days 7 or 8, using the whole-cell patch-clamp technique. A 3-h incubation with LPS (200 ng/ml) markedly depressed both the delayed rectifier (IKV) and transient A-type (IA) K+ currents evoked by depolarizations above 0 and −40 mV, respectively. The percent decrease of IKV and IA (∼30%) did not vary with membrane potential, suggesting that inhibition of both types of K+ channels by LPS was voltage-insensitive. The endotoxin did neither modify the steady-state voltage-dependent activation properties of IKV and IA nor the steady-state inactivation of IA. The present results suggest that, by inhibiting IKV and IA, LPS applied extracellulary increases the action potential firing in cerebellar granule neurons. It is concluded that P. fluorescens MF37 may provoke in the CNS disorders associated with sever alterations of membrane ionic channel functions." @default.
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• W1998597100 date "2003-09-01" @default.
• W1998597100 modified "2023-09-27" @default.
• W1998597100 title "Pseudomonas fluorescens lipopolysaccharide inhibits both delayed rectifier and transient A-type K+ channels of cultured rat cerebellar granule neurons" @default.
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• W1998597100 doi "https://doi.org/10.1016/s0006-8993(03)03055-5" @default.
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