The role of catecholamine innervation in the medial prefrontal cortex on the regulation of body weight and food intake

Rita Gálosi, Andras Hajnal, Zoltán Petykó, Géza Hartmann, Zoltán Karádi, László Lénárd

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Effects of 6-hydroxydopamine (6-OHDA) lesions in the medial prefrontal cortex with or without protection of norepinephrine (NE) fibers were examined on basic regulatory processes of feeding. Daily body weight, food and water intake were measured. Locomotor activity, ingestion after food or water deprivation, and preference for 5% and 10% glucose solution were examined. Dopamine (DA) and NE content, as well as, tyrosine hydroxylase immunoreactivity were assessed to confirm the neurotoxic effect of treatments. 6-OHDA lesions of the medial prefrontal cortex with or without NE fiber protection resulted in body weight loss. Diminished habituation in open field tests, i.e. a persistently high motor activity, was also observed. Application of 6-OHDA with NE fiber protection led to increased food consumption following food-deprivation and to enhanced glucose preference. Enhanced intake of 10% over 5% glucose solution was also detected. 6-OHDA lesion resulted in a decrease to 20% of NE tissue concentration and only to 75% of DA concentration. In case of lesion with NE protection the NE content decreased to 69% and DA level to 51% with significant loss of tyrosine hydroxylase positive fibers in the deeper layers of the medial prefrontal cortex.DA depletion in the medial prefrontal cortex resulted in increased behavioral responsiveness to hunger and glucose, as well as, to open field environment. Pronounced lesion of NE terminals caused increased reaction to the environment in open field but not to hunger or glucose solution.

Original languageEnglish
Pages (from-to)318-327
Number of pages10
JournalBehavioural Brain Research
Volume286
DOIs
Publication statusPublished - Jun 1 2015

Keywords

  • Body weight
  • Catecholamine
  • Glucose preference
  • Medial prefrontal cortex

ASJC Scopus subject areas

  • Behavioral Neuroscience

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