Intracerebroventricular (ICV) injection of tachykinins (TKs) inhibits ethanol intake and angiotensin II-induced water intake; the effects are apparently mediated by NK-3 and NK-1 receptors, respectively. The present study evaluated the effect of the TK PG-KII, a novel kassinin-like peptide isolated from the skin of the Australian frog Pseudophryne guntheri, in these in vivo tests for central activity. PG-KII, given by ICV injection, potently inhibited alcohol intake in genetically selected alcohol-preferring rats, being about 3 times more potent than the selective NK-3 receptor agonist NH2-SENK. The dose of 100 ng/rat, that markedly inhibited ethanol intake, did not inhibit food intake and prandial drinking in food deprived rats, providing evidence that the effect of PG-KII on ethanol intake is behaviorally selective. The effect on ethanol intake was inhibited by ICV injection of the NK-3 receptor antagonist R820, but was not modified by the NK-1 receptor antagonist SR 140333. PG-KII inhibited drinking induced by angiotensin II only at doses of 300 or 1000 ng/rat, being about 5 times less potent than the selective NK-1 receptor agonist [Sar(9),Met(O-2)(11)] substance: P. These doses of PG-KII produced also marked increase in competing behaviors, such as grooming and locomotion. The dose of 1000 ng/rat evoked a general inhibition of the ingestive behavior, reducing also food intake. The ICV injection of the NK-1 receptor antagonist SR 140333 only slightly inhibited the effect of PG-KII on angiotensin II-induced drinking, while it markedly reduced that of [Sar(9),Met(O-2)(11)] substance P. These findings, in accordance with those of previous studies, indicate that PG-KII is endowed with marked activity at central NK-3 receptors, and low activity at NK-1 receptors. (C) 1997 Elsevier Science Inc.

Further evidence that the tachykinin PG-KII is a potent agonist at central NK-3, but not NK-1, receptors / Carlo, Polidori; Izabela, Panocka; Roberto, Ciccocioppo; Broccardo, Maria; Improta, Giovanna; Domenico, Regoli; Maurizio, Massi. - In: PEPTIDES. - ISSN 0196-9781. - 18:6(1997), pp. 825-833. [10.1016/s0196-9781(97)00022-3]

Further evidence that the tachykinin PG-KII is a potent agonist at central NK-3, but not NK-1, receptors

BROCCARDO, Maria;IMPROTA, Giovanna;
1997

Abstract

Intracerebroventricular (ICV) injection of tachykinins (TKs) inhibits ethanol intake and angiotensin II-induced water intake; the effects are apparently mediated by NK-3 and NK-1 receptors, respectively. The present study evaluated the effect of the TK PG-KII, a novel kassinin-like peptide isolated from the skin of the Australian frog Pseudophryne guntheri, in these in vivo tests for central activity. PG-KII, given by ICV injection, potently inhibited alcohol intake in genetically selected alcohol-preferring rats, being about 3 times more potent than the selective NK-3 receptor agonist NH2-SENK. The dose of 100 ng/rat, that markedly inhibited ethanol intake, did not inhibit food intake and prandial drinking in food deprived rats, providing evidence that the effect of PG-KII on ethanol intake is behaviorally selective. The effect on ethanol intake was inhibited by ICV injection of the NK-3 receptor antagonist R820, but was not modified by the NK-1 receptor antagonist SR 140333. PG-KII inhibited drinking induced by angiotensin II only at doses of 300 or 1000 ng/rat, being about 5 times less potent than the selective NK-1 receptor agonist [Sar(9),Met(O-2)(11)] substance: P. These doses of PG-KII produced also marked increase in competing behaviors, such as grooming and locomotion. The dose of 1000 ng/rat evoked a general inhibition of the ingestive behavior, reducing also food intake. The ICV injection of the NK-1 receptor antagonist SR 140333 only slightly inhibited the effect of PG-KII on angiotensin II-induced drinking, while it markedly reduced that of [Sar(9),Met(O-2)(11)] substance P. These findings, in accordance with those of previous studies, indicate that PG-KII is endowed with marked activity at central NK-3 receptors, and low activity at NK-1 receptors. (C) 1997 Elsevier Science Inc.
1997
angiotensin-induced drinking; ethanol intake; nk-1 receptors; nk-3 receptors; pg-kii; tachykinins
01 Pubblicazione su rivista::01a Articolo in rivista
Further evidence that the tachykinin PG-KII is a potent agonist at central NK-3, but not NK-1, receptors / Carlo, Polidori; Izabela, Panocka; Roberto, Ciccocioppo; Broccardo, Maria; Improta, Giovanna; Domenico, Regoli; Maurizio, Massi. - In: PEPTIDES. - ISSN 0196-9781. - 18:6(1997), pp. 825-833. [10.1016/s0196-9781(97)00022-3]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/462275
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