Evidence that the anorexia induced by lipopolysaccharide is mediated by the 5-HT2C receptor.

Abstract

Rats consistently reduce their food intake following injections of bacterial lipopolysaccharides (LPS). Because inhibition of serotonergic (5-HT) activity by 8-OH-DPAT (5-HT(1A) activation) attenuates LPS-induced anorexia, we conducted a series of studies to examine whether other 5-HT-receptors are involved in the mediation of peripheral LPS-induced anorexia. In all experiments, rats were injected with LPS (100 microg/kg body weight [BW] ip) at lights out (hour 0). Antagonists were administered peripherally at hour 4, shortly after the onset of anorexia, which presumably follows the enhanced cytokine production after LPS. Food intake was then recorded during the subsequent 2 h or longer. 5-HT receptor antagonists cyanopindolol and SB 224289 (5-HT(1B)), ketanserin (5-HT(2A)), RS-102221 (5-HT(2C)), and metoclopramide (5-HT(3)) failed to attenuate LPS-induced anorexia. In contrast, both ritanserin (5-HT(2A/C)-receptor antagonist) (0.5 mg/kg BW) and SB 242084 (5-HT(2C)) (0.3 mg/kg BW) attenuated LPS-induced anorexia at doses that did not alter food intake in non-LPS-treated rats (all P<.01). Our results suggest that at least part of the anorexia following peripheral LPS administration is mediated through an enhanced 5-HT-ergic activity and the 5-HT(2C) receptor.

• Authors: Claudia von Meyenburg, Wolfgang Langhans, Brian J Hrupka
• Journal: Pharmacology, biochemistry, and behavior (Pharmacol Biochem Behav) Vol. 74 Issue 2 Pg. 505-12 (Jan 2003) ISSN: 0091-3057 [Print] United States
• PMID: 12479973 (Publication Type: Journal Article)

Chemical References

• 6-chloro-5-methyl-1-((2-(2-methylpyrid-3-yloxy)pyrid-5-yl)carbamoyl)indoline
• 8-(5-(5-amino-2,4-dimethoxyphenyl)-5-oxopentyl)-1,3,8-triazaspiro(4.5)decane-2,4-dione
• Adrenergic beta-Antagonists
• Aminopyridines
• Dopamine Antagonists
• Indoles
• Lipopolysaccharides
• Piperidones
• Receptor, Serotonin, 5-HT2C
• Receptors, Serotonin
• SB 22489G
• Serotonin Antagonists
• Spiro Compounds
• Sulfonamides
• Ritanserin
• cyanopindolol
• Pindolol
• Metoclopramide

Topics

• Adrenergic beta-Antagonists (pharmacology)
• Aminopyridines (pharmacology)
• Animals
• Anorexia (chemically induced, psychology)
• Dopamine Antagonists (pharmacology)
• Dose-Response Relationship, Drug
• Indoles (pharmacology)
• Lipopolysaccharides (pharmacology)
• Male
• Metoclopramide (pharmacology)
• Pindolol (analogs & derivatives, pharmacology)
• Piperidones (pharmacology)
• Rats
• Rats, Sprague-Dawley
• Receptor, Serotonin, 5-HT2C
• Receptors, Serotonin (drug effects)
• Ritanserin (pharmacology)
• Serotonin Antagonists (pharmacology)
• Spiro Compounds (pharmacology)
• Sulfonamides (pharmacology)