The activity of catecholamine synthesis in the hypothalamus of female normotensive Wistar Kyoto and spontaneously hypertensive rats |
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Authors: | Jun Arita Ryuhei Hashimoto Fukuko Kimura |
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Affiliation: | Department of Physiology, Yokohama City University School of Medicine, Japan. |
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Abstract: | The activity of catecholamine synthesis in the hypothalamus, as determined by the rate of 3,4-dihydroxyphenylalanine (DOPA) accumulation after the administration of a DOPA decarboxylase inhibitor, was compared among Wistar, spontaneously hypertensive (SH), and genetically matched normotensive Wistar Kyoto (WKY) rats. DOPA accumulation in the median eminence, an index of the activity of tuberoinfundibular dopaminergic neurons, was greater in SH rats than Wistar and WKY rats while DOPA accumulation in the medial preoptic area was smaller in Wistar rats than SH and WKY rats. No strain difference was found in DOPA accumulation in the corpus striatum, which represents the activity of nigrostriatal dopaminergic neurons. These results suggest that there are differences in catecholamine synthesis in the hypothalamus not only between SH and WKY rats but also between WKY and Wistar rats. |
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Keywords: | Spontaneously hypertensive rat Normotensive Wistar Kyoto rat Catecholamine synthesis Tuberoinfundibular dopaminergic neuron |
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