Basal and glucoprivic-induced changes in extracellular GABA in the ventral hypothalamus of Zucker rats

S. E. Specter, Barbara A Horwitz, J. Lee Beverly

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Abstract

The diminished sensitivity of genetically obese (fa/fa) Zucker rats to the glucoprivic agent 2-deoxy-D-glucose (2-DG) may involve impaired release of the neurotransmitter γ-aminobutyric acid (GABA) in discrete regions of the hypothalamus. Extracellular GABA concentrations in the medial (MH) and lateral (LH) hypothalamus of lean (Fa/Fa) and age-matched obese (fa/fa) male Zucker rats before and after 2-DG (1.2 mmol/kg iv). Basal GABA concentrations were higher (P < 0.05) in the MH of obese vs. lean rats. No differences were noted in LH GABA levels between lean and obese rats or in baseline extracellular GABA levels between brain regions in lean rats. In lean rats, a characteristic bimodal increase in GABA concentrations was apparent in the MH, whereas GABA concentrations decreased in the LH during the 60 min after 2-DG. No changes in GABA concentrations in dialysate from the MH or LH of obese rats were observed after 2-DG. The alterations in basal activity and responsiveness to glucoprivic stimuli by GABAergic system in the MH of obese rats may reflect a defect in central glucostatic control of food intake and, ultimately, in the hypothesized autonomic imbalance in fa/fa Zucker rat.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume271
Issue number2 40-2
StatePublished - Aug 1996
Externally publishedYes

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Keywords

  • 2-deoxy-D-glucose
  • lateral hypothalamus
  • medial hypothalamus
  • microdialysis

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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