A2A adenosine receptor agonists reduce both high-palatability and low-palatability food intake in female rats

Behav Pharmacol. 2012 Sep;23(5-6):567-74. doi: 10.1097/FBP.0b013e3283566a60.

Abstract

The present study examined the effect of two A(2A) adenosine receptor (AR) agonists, CGS 21680 and VT 7, on high-palatability food (HPF) intake in a model of binge eating in sated rats and on low-palatability food (LPF) intake in food-deprived rats. Binge eating was induced in female rats by three 8-day cycles of food restriction/refeeding, followed by acute stress. Two groups of rats were used: NR+NS rats normally fed and not stressed and R+S rats exposed to cycles of food restriction/refeeding and then stressed. R+S rats had higher intake of HPF than the NR+NS controls. The two A(2A)AR agonists were tested at doses of 0.1 and 0.05 mg/kg intraperitoneally; VT 7 did not modify locomotor activity at either dose, whereas CGS 21680 only slightly reduced it at the higher dose tested. The injection of 0.1 mg/kg of both agonists markedly reduced HPF intake both in R+S and in NR+NS rats. The dose of 0.05 mg/kg was inactive. CGS 21680 and VT 7, 0.1 mg/kg, also reduced the standard LPF intake in 24 h food-deprived rats; however, they did not reduce water intake, indicating that their effect on food intake is selective. The dose of 0.05 mg/kg was inactive. Thus, A(2A)AR agonists exert a rather general effect on food intake, inhibiting both HPF intake in sated rats and LPF intake in food-deprived rats. They may potentially be useful pharmacological agents to control binge-related eating disorders and to reduce food overconsumption associated with obesity.

Publication types

  • Comparative Study

MeSH terms

  • Adenosine / administration & dosage
  • Adenosine / analogs & derivatives*
  • Adenosine / therapeutic use
  • Adenosine A2 Receptor Agonists / administration & dosage
  • Adenosine A2 Receptor Agonists / therapeutic use*
  • Animals
  • Appetite Depressants / administration & dosage
  • Appetite Depressants / therapeutic use*
  • Appetite Regulation / drug effects
  • Behavior, Animal / drug effects
  • Binge-Eating Disorder / drug therapy*
  • Disease Models, Animal
  • Dose-Response Relationship, Drug
  • Drug Therapy, Combination
  • Energy Intake / drug effects
  • Feeding Behavior / drug effects*
  • Female
  • Food Preferences
  • Nerve Tissue Proteins / antagonists & inhibitors
  • Nerve Tissue Proteins / metabolism
  • Phenethylamines / administration & dosage
  • Phenethylamines / therapeutic use*
  • Rats
  • Rats, Sprague-Dawley
  • Receptor, Adenosine A2A / chemistry
  • Receptor, Adenosine A2A / metabolism*
  • Satiety Response / drug effects
  • Thionucleosides / administration & dosage
  • Thionucleosides / therapeutic use*

Substances

  • 5'-N-ethylcarboxamido-2-(2-phenethylthio)adenosine
  • Adenosine A2 Receptor Agonists
  • Appetite Depressants
  • Nerve Tissue Proteins
  • Phenethylamines
  • Receptor, Adenosine A2A
  • Thionucleosides
  • 2-(4-(2-carboxyethyl)phenethylamino)-5'-N-ethylcarboxamidoadenosine
  • Adenosine