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• W2080554460 abstract "1. Bradykinin has multiple effects on differentiated NG108-15 neuroblastoma x glioma cells: it increases Ins(1,4,5)P3 production and intracellular Ca2+ concentration [Ca2+]i evokes a Ca2+ activated K+ current (IK(Ca)) and inhibits M current (IM). We studied the effect of the aminosteroid U73122 and the antibiotic neomycin, both putative blockers of phospholipase C (PLC), on these four bradykinin effects. 2. Preincubation with 1 or 5 microM U73122 for 15 min partly suppressed Ins(1,4,5)P3 generation and the increase in [Ca2+]i induced by 1 microM bradykinin. U73122 10 microM caused total and irreversible inhibition. The inactive analogue U73343 was without effect. 3. Resting levels of Ins(1,4,5)P3 were not affected. However, resting [Ca2+]i was increased by 10 microM U73122, but not by U73343. Individual cells responded to 10 microM U73122 with a small increase in [Ca2+]i, followed in some cells by a large further rise. 4. Pretreatment of whole-cell clamped cells with 1 microM U73122 for 30 min reduced the bradykinin-induced IK(Ca) to a fifth of its normal size. To suppress it totally, a 7-12 min pretreatment with 5 microM U73122 was required. Again, U73343 was without effect. 5. U73122 and U73343 at concentrations of 5-10 microM irreversibly decreased the holding current (Ih) which at a holding potential of -30 or -20 mV mainly flows through open M channels. The decrease was often preceded by a transient increase. 6. M current (IM) measured with 1 s pulses, was also decreased by 5-10 microM U73122 and U73343, but short applications of U73122 could cause a small increase. The bradykinin-induced inhibition of IM was not affected by U73122. 7. Preincubation with 1 or 3 mM neomycin for 15 min did not affect Ins(1,4,5)P3 generation and the increase in [Ca2+]i induced by bradykinin. Pretreatment with 3 mM neomycin for about 20 min diminished the bradykinin-induced IK(Ca) to a fifth of its normal size. 8. The four main conclusions drawn from the results are: (a) U73122 suppresses bradykinin-induced PLC activation and IK(Ca), but not IM inhibition. (b) This indicates that the transient outward current IK(Ca), but not the decrease of IM in response to bradykinin, is mediated by PLC. (c) U73122 itself inhibits IM and mobilizes Ca2+ from intracellular stores. (d) Externally applied neomycin is not an effective inhibitor of PLC-mediated signalling pathways in NG108-15 cells." @default.
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• W2080554460 date "1997-02-01" @default.
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• W2080554460 title "The effects of bradykinin on K⁺currents in NG108-15 cells treated with U73122, a phospholipase C inhibitor, or neomycin" @default.
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• W2080554460 doi "https://doi.org/10.1038/sj.bjp.0700991" @default.
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