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. 1996 Jan;117(2):241–249. doi: 10.1111/j.1476-5381.1996.tb15183.x

Intracerebroventricular responses to neuropeptide gamma in the conscious rat: characterization of its receptor with selective antagonists.

P Picard 1, R Couture 1
PMCID: PMC1909266  PMID: 8789375

Abstract

1. The cardiovascular and behavioural effects elicited by the intracerebroventricular (i.c.v.) administration of neuropeptide gamma (NP gamma) in the conscious rat were assessed before and 5 min after i.c.v. pretreatment with antagonists selective for NK1 (RP 67,580), NK2 (SR 48,968) and NK3 (R 820) receptors. In addition, the central effects of NP gamma before and after desensitization of the NK1 and NK2 receptors with high doses of substance P (SP) and neurokinin A (NKA) were compared. 2. Intracerebroventricular injection of NP gamma (10-780 pmol) evoked dose- and time-dependent increases in mean arterial blood pressure (MAP), heart rate (HR), face washing, head scratching, grooming and wet-dog shake behaviours. Similar injection of vehicle or 1 pmol NP gamma had no significant effect on those parameters. 3. The cardiovascular and behavioural responses elicited by NP gamma (25 pmol) were significantly and dose-dependently reduced by pretreatment with 650 pmol and 6.5 nmol of SR 48,968. No inhibition of NP gamma responses was observed when 6.5 nmol of RP 67,580 was used in a similar study. Moreover, the prior co-administration of SR 48,968 (6.5 nmol) and RP 67,580 (6.5 nmol) with or without R 820 (6.5 nmol) did not reduce further the central effects of NP gamma and significant residual responses (30-50%) remained. 4. No tachyphylaxis to NP gamma-induced cardiovascular and behavioural changes was observed when two consecutive injections of 25 pmol NP gamma were given 24 h apart. 5. Simultaneous NK1 and NK2 receptor desensitization reduced significantly central effects mediated by 25 pmol NP gamma. However, significant residual responses persisted as seen after pretreatment with SR 48,968. 6. The results suggest that the central effects of NP gamma are mediated partly by NK2 receptors and by another putative tachykinin receptor subtype (NP gamma receptor?) that appears to be different from NK1 and NK3 receptors.

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Selected References

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