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The concentration of dynorphin (1-8) immunoreactivity [ir-dyn(1-8)] was measured in 10 hypothalamic and 11 brainstem nuclei of Sprague-Dawley (SD) and 6- and 14-week old Wistar-Kyoto (WKY) and spontaneously hypertensive (SH) rats. The highest concentrations of ir-dyn(1-8) were found in the lateral preoptic and lateral hypothalamic areas of the hypothalamus and the solitary tract nucleus of the brainstem. Levels of the peptide were low in other brainstem nuclei compared to hypothalamic areas. There was a significant reduction in ir-dyn(1-8) concentrations at 14 weeks of age compared to 6 weeks of age in all 9 nuclei examined in SH and WKY rats. However, there were no differences between the strains at either age. These changes may be related to the increase in blood pressure that occurs in both SH and WKY rats over this age range although other factors must also be involved to produce the higher blood pressure levels of the SH rat.
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