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char = d;code = 100
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char = (;code = 40
char = N;code = 78
char = P;code = 80
char = P;code = 80
char = B;code = 66
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char = m;code = 109
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char = n;code = 110
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char = r;code = 114
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char = ;code = 32
char = p;code = 112
char = o;code = 111
char = r;code = 114
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char = a;code = 97
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char = v;code = 118
char = e;code = 101
char = i;code = 105
char = n;code = 110
char = .;code = 46
result sql = Investigation of the effects of 5-nitro-2-(3-phenylpropylamino)-benzoic acid (NPPB) on membrane currents in rat portal vein.
Investigation of the effects of 5-nitro-2-(3-phenylpropylamino)-benzoic acid (NPPB) on membrane currents in rat portal vein.
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char = f;code = 102
char = f;code = 102
char = e;code = 101
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char = N;code = 78
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char = P;code = 80
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char = .;code = 46
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result sql = 1. The effects of 5-nitro-2-(3-phenylpropylamino)-benzoic acid (NPPB) were investigated on evoked and spontaneous currents in freshly-isolated cells from the rat portal vein by use of conventional whole-cell recording and perforated-patch techniques. 2. At a holding potential of -60 mV in potassium-free, caesium-containing solutions, NPPB (10 microM) inhibited calcium (Ca)-sensitive chloride currents (ICl(Ca)) evoked by caffeine (10 mM) and by noradrenaline (10 microM) by 58% and 96%, respectively. 3. At a holding potential of -2 mV in potassium (K)-containing solutions, NPPB (10 microM) inhibited charybdotoxin-sensitive K-currents (IBK(Ca)) induced by noradrenaline (10 microM) and acetylcholine (10 microM) by approximately 90%. In contrast, IBK(Ca) induced by caffeine (10 mM) was unaffected in the presence of NPPB (10 microM). Conversely, IBK(Ca) elicited by caffeine (2 mM) was reduced by approximately 50% whereas IBK(Ca) evoked by noradrenaline (50 microM) was not significantly inhibited by NPPB. 4. In K-containing solutions, NPPB (10 microM) abolished spontaneous transient outward currents (STOCs) and induced a slowly-developing outward K-current. Bath application of glibenclamide (10 microM) abolished the outward current but did not antagonize the inhibitory effects of NPPB on STOCs or on IBK(Ca) evoked by noradrenaline. 5. In caesium-containing solutions, NPPB (30 microM) inhibited voltage-sensitive Ca-currents. 6. In Ca-free, K-containing solutions and in the presence of glibenclamide (5 microM), IBK(Ca) induced by 20 microM NS1619 was enhanced by NPPB (10 microM). 7. It is concluded that NPPB inhibits agonist-induced ICl(Ca) in rat portal vein smooth muscle. However, this agent also inhibits agonist-evoked IBK(Ca) and STOCs. Moreover, NPPB inhibits voltage-sensitive Ca-currents and stimulates a glibenclamide-sensitive K-current and IBK(Ca). The effects of this agent on evoked ICl(Ca) and IBK(Ca) and on STOCs probably involves an inhibitory action on intracellular Ca-stores.

Publication: Br. J. Pharmacol. 1996 Jan ;117(1)::175-83.
Publication Date: 1996 Jan
Study Author(s): Kirkup, A J;Edwards, G;Weston, A H;
Institution: School of Biological Sciences, University of Manchester.
Shortcut link to this study:
1. The effects of 5-nitro-2-(3-phenylpropylamino)-benzoic acid (NPPB) were investigated on evoked and spontaneous currents in freshly-isolated cells from the rat portal vein by use of conventional whole-cell recording and perforated-patch techniques. 2. At a holding potential of -60 mV in potassium-free, caesium-containing solutions, NPPB (10 microM) inhibited calcium (Ca)-sensitive chloride currents (ICl(Ca)) evoked by caffeine (10 mM) and by noradrenaline (10 microM) by 58% and 96%, respectively. 3. At a holding potential of -2 mV in potassium (K)-containing solutions, NPPB (10 microM) inhibited charybdotoxin-sensitive K-currents (IBK(Ca)) induced by noradrenaline (10 microM) and acetylcholine (10 microM) by approximately 90%. In contrast, IBK(Ca) induced by caffeine (10 mM) was unaffected in the presence of NPPB (10 microM). Conversely, IBK(Ca) elicited by caffeine (2 mM) was reduced by approximately 50% whereas IBK(Ca) evoked by noradrenaline (50 microM) was not significantly inhibited by NPPB. 4. In K-containing solutions, NPPB (10 microM) abolished spontaneous transient outward currents (STOCs) and induced a slowly-developing outward K-current. Bath application of glibenclamide (10 microM) abolished the outward current but did not antagonize the inhibitory effects of NPPB on STOCs or on IBK(Ca) evoked by noradrenaline. 5. In caesium-containing solutions, NPPB (30 microM) inhibited voltage-sensitive Ca-currents. 6. In Ca-free, K-containing solutions and in the presence of glibenclamide (5 microM), IBK(Ca) induced by 20 microM NS1619 was enhanced by NPPB (10 microM). 7. It is concluded that NPPB inhibits agonist-induced ICl(Ca) in rat portal vein smooth muscle. However, this agent also inhibits agonist-evoked IBK(Ca) and STOCs. Moreover, NPPB inhibits voltage-sensitive Ca-currents and stimulates a glibenclamide-sensitive K-current and IBK(Ca). The effects of this agent on evoked ICl(Ca) and IBK(Ca) and on STOCs probably involves an inhibitory action on intracellular Ca-stores.
PMID: 8825360

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