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Title: Central monoamine oxidase and phenolsulfotransferase activities in spontaneously hypertensive rats
Authors: Sim, M.K. 
Issue Date: 1991
Citation: Sim, M.K. (1991). Central monoamine oxidase and phenolsulfotransferase activities in spontaneously hypertensive rats. Life Sciences 48 (20) : 1985-1990. ScholarBank@NUS Repository.
Abstract: The activities of monoamine oxidase and phenolsulfotransferase in the hypothalamus and anterior pituitary gland of spontaneously hypertensive rats and the normotensive control (Wistar Kyoto rat) rats were investigated. The monoamine oxidase activity (determined using dopamine as substrate) in both these tissues was not significantly different between the normo- and hypertensive animals. Hypothalamic phenolsulfotransferase does not sulfate-conjugate dopamine at pH of 6.5 and pituitary phenolsulfotransferase does not sulfate-conjugate dopamine or 3,4-dihydroxyphenylacetic acid at the same pH. Hypothalamic phenolsulfotransferase activity determined using 3,4-dihydroxyphenylacetic acid as substrate was significantly higher in the spontaneously hypertensive than the Wistar Kyoto rats, while pituitary enzyme (determined using phenol as substrate) was the same in both strains of animals. We proposed that in the spontaneously hypertensive rats the higher level of hypothalamic phenolsulfotransferase could (by removing 3,4-dihydroxyphenylacetic acid as sulfated acid) increase the deamination of dopamine by monoamine oxidase. This could in turn result in the presence of high amounts of sulfated 3,4-dihydroxyphenylacetic acid in the anterior pituitary gland reported in our earlier study, and be partly responsible for the reduced central dopaminergic activity found in the hypertensive rats.
Source Title: Life Sciences
ISSN: 00243205
DOI: 10.1016/0024-3205(91)90232-Z
Appears in Collections:Staff Publications

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