Intradermal Injection of Oxytocin Aggravates Chloroquine-Induced Itch Responses
chloroquine
itch
nitric oxide
oxytocin
vasopressin-1a receptor
Journal
Frontiers in pharmacology
ISSN: 1663-9812
Titre abrégé: Front Pharmacol
Pays: Switzerland
ID NLM: 101548923
Informations de publication
Date de publication:
2019
2019
Historique:
received:
09
06
2019
accepted:
30
10
2019
entrez:
12
12
2019
pubmed:
12
12
2019
medline:
12
12
2019
Statut:
epublish
Résumé
Oxytocin (OT), a hormone synthesized within the paraventricular nucleus and supraoptic nucleus of the hypothalamus, when given intracerebroventricularly, induces strong scratching behaviors. However, it is not clear whether intradermal injection (ID) of OT elicits itch sensation. Herein, we found that OT (0.02 mg/ml) did not elicit an itch-scratching response in mice but aggravated chloroquine (CQ, 3 mmol/L)-elicited scratching behavior. Similar to OT, arginine vasopressin (AVP, 0.02 mg/ml), which is structurally related to OT, also enhanced CQ-induced scratching behavior but did not directly induce scratching behavior in mice. Mechanistically, OT-mediated enhancement of CQ-induced scratching behavior was significantly suppressed by conivaptan (0.05 mg/ml), a vasopressin-1a receptor (V1AR) antagonist and 1,400 W (3 mg/kg), inhibitor of inducible nitric oxide synthase (iNOS), but not OT receptor (OTR) antagonist L-368,899 (0.05 mg/ml). Notably, conivaptan also directly decreased CQ-induced scratching. In conclusion, OT plays a role in CQ-induced scratching behavior
Identifiants
pubmed: 31824317
doi: 10.3389/fphar.2019.01380
pmc: PMC6881818
doi:
Types de publication
Journal Article
Langues
eng
Pagination
1380Informations de copyright
Copyright © 2019 Li, Sun, Zheng, Zong, Li, Meng, Li, Liu, Wang and Li.
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