Prostacyclin receptor in the brain and central terminals of the primary sensory neurons: an autoradiographic study using a stable prostacyclin analogue [3H]iloprost

Neuroscience
K MatsumuraY Watanabe

Abstract

Presence and localization of the prostacyclin receptor in the rat brain and spinal cord were examined by in vitro autoradiography using [3H]iloprost, a highly specific and stable agonist for this receptor. Density of specific binding sites for iloprost was generally high in four regions of the lower brain stem, that is, the medial and commissural subnuclei of the nucleus tractus solitarius, the area postrema, superficial layers of the spinal trigeminal nucleus caudalis and dorsal horn. Moderate density was found in the thalamus, cerebral cortex, hippocampus, striatum and dorsal cochlear nucleus. The distribution pattern was distinct from those of other prostanoid binding sites previously studied except that prostaglandin E2 binding sites were also abundant in the nucleus tractus solitarius, spinal trigeminal nucleus caudalis and dorsal horn. Even in these regions, binding sites for iloprost had several features clearly different from those for prostaglandin E2. First, within the medial and commissural subnuclei of the nucleus tractus solitarius, iloprost binding sites were distributed preferentially in the dorsal part, while those for prostaglandin E2 were located more ventrolaterally. Second, on postnatal day 0, iloprost bindi...Continue Reading

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