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      Noradrenergic Afferents Facilitate the Activity of Tuberoinfundibular Neurons of the Hypothalamic Paraventricular Nucleus

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          T he role of ascending noradrenergic projections of medullary origin in regulating the activity of tuberoinfundibular neurons of the hypothalamic paraventricular nucleus (PVN) was examined in pentobarbital-anesthetized male Sprague-Dawley rats. Discrete electrical stimulation of either the Al or the A2 noradrenaline cell group areas of the caudal medulla enhanced the probability of firing in a substantial proportion of antidromically identified tuberoinfundibular PVN cells tested. Notably, no inhibitory effects were observed. Destruction of the PVN noradrenergic terminal plexus by local application of the neurotoxin 6-hydroxydopamine 1 day prior to electrophysiological experiments abolished the effects of both Al and A2 stimulation. These findings indicate that noradrenergic afferents can exert a facilitatory influence on the activity of a population of tuberoinfundibular PVN neurons, thus supporting earlier suggestions that central noradrenergic structures can enhance the release of certain anterior pituitary hormones.

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          Author and article information

          S. Karger AG
          28 March 2008
          : 41
          : 1
          : 17-22
          Neurosciences Unit, Montreal General Hospital Research Institute and McGill University, Montreal, Canada
          124148 Neuroendocrinology 1985;41:17–22
          © 1985 S. Karger AG, Basel

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          Pages: 6
          Original Paper


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