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Abstract
The density (Bmax) of muscimol and clonazepam binding to hypothalamic membranes from spontaneously hypertensive rats (SHR) was reduced compared to age-matched Wistar Kyoto (WKY) animals in the period 80 – 120 days. There were no significant differences in dissociation constant (Kd) for either ligand at this time. At 30 – 36 days, prior to development of pronounced hypertension, there were no differences in Kd or Bmax for either ligand in SHR and WKY animals. There were also deficits in endogenous hypothalamic GABA concentrations in SHR at 75 and 120 days as compared to WKY. The hypothesis is advanced, that there may be a dysfunction of a hypothalamic GABA system in the SHR rat as hypertension develops.
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