Mediation of the behavioral, endocrine and thermoregulatory actions of ghrelin

Research output: Contribution to journalArticle

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Abstract

The action of ghrelin on telemetrically recorded motor activity and the transmission of the effects of this neuropeptide on spontaneous and exploratory motor activity and some related endocrine and homeostatic parameters were investigated. Different doses (0.5-5 μg) of ghrelin administered intracerebroventricularly caused significant increases in both square crossing and rearing activity in the "open-field" apparatus, while only the dose of 5 μg evoked a significant increase in the spontaneous locomotor activity recorded by telemetry. Ghrelin also induced significant increases in corticosterone release and core temperature. To determine the transmission of these neuroendocrine actions, the rats were pretreated with different antagonists, such as a corticotropin-releasing hormone (CRH) antagonist (α-helical CRH9-41), the nitric oxide synthase inhibitor Nω-nitro-l-arginine-methyl ester (l-NAME), haloperidol, cyproheptadine or the cyclooxygenase inhibitor noraminophenazone (NAP). The open-field and biotelemetric observations revealed that the motor responses were diminished by pretreatment with the CRH antagonist and haloperidol. In the case of HPA (hypothalamic pituitary adrenal) activation, only cyproheptadine pretreatment proved effective; haloperidol and l-NAME did not modify the corticosterone response. NAP had only a transient, while cyproheptadine elicited a more permanent impact on the hyperthermic response evoked by ghrelin; the other antagonists proved to be ineffective. The present data suggest that both CRH release and dopaminergic transmission may be involved in the ghrelin-evoked behavioral responses. On the other hand, ghrelin appears to have an impact on the HPA response via a serotonergic pathway and on the hyperthermic response via a cyclooxygenase and a serotonergic pathway.

Original languageEnglish
Pages (from-to)266-273
Number of pages8
JournalHormones and Behavior
Volume50
Issue number2
DOIs
Publication statusPublished - Aug 2006

Fingerprint

Ghrelin
Cyproheptadine
Corticotropin-Releasing Hormone
Haloperidol
Hormone Antagonists
Corticosterone
Motor Activity
Telemetry
Cyclooxygenase Inhibitors
Locomotion
Prostaglandin-Endoperoxide Synthases
Neuropeptides
Nitric Oxide Synthase
Temperature

Keywords

  • Behavior
  • HPA axis
  • Open field
  • Telemetry

ASJC Scopus subject areas

  • Endocrinology
  • Behavioral Neuroscience
  • Neurology
  • Psychology(all)

Cite this

Mediation of the behavioral, endocrine and thermoregulatory actions of ghrelin. / Jászberényi, M.; Bujdosó, E.; Bagosi, Z.; Telegdy, G.

In: Hormones and Behavior, Vol. 50, No. 2, 08.2006, p. 266-273.

Research output: Contribution to journalArticle

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