Abstract
Previously we demonstrated altered amino acid levels in brainstem regions of adult spontaneously hypertensive rats (SHR). For comparison, in this study, we determined amino acid concentrations in discrete brainstem regions in young prehypertensive SHR and renal hypertensive rats. In prehypertensive SHR, the content of glutamate was increased in the rostral ventrolateral medulla and the caudal ventrolateral medulla, and the content of beta-alanine was decreased in the nucleus tractus solitarii. In renal hypertensive rats, there was no change in glutamate and beta-alanine contents in all the regions. The profiles of contents of glutamate and beta-alanine in the brainstem regions in young SHR but not in renal hypertensive rats are the same as those found previously in adult SHR. Thus, the results of the present study suggest that the altered amino acid metabolism in the brainstem of SHR may be genetically inherent.
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