The oxidation of adrenaline and noradrenaline by the two forms of monoamine oxidase from human and rat brain
作者:Anne-Marie O'Carroll、Marie E. Bardsley、Keith F. Tipton
DOI:10.1016/0197-0186(86)90182-8
日期:1986.1
Noradreanline and adrenaline were substrates for both forms of the enzyme in all regions studied. The total MAO activity was found to be highest in the hypothalamus and lowest in the cerebellar cortex. Use of the selective MAO inhibitors clorgyline and (?)-deprenyl also showed adrenaline and noradrenaline to be substrates for both forms of the enzyme in rat brain. In human cerebral cortex and rat brain the two
使用选择性单胺氧化酶抑制剂克咯啉和(α)-异戊二烯基来研究单胺氧化酶-A和-B(MAO-A,MAO-B)对(?)-去甲肾上腺素和(+),(?)的活性分布肾上腺素来自人脑七个不同区域的匀浆。还确定了在这项工作中使用的条件下,对5-羟基色胺和2-苯乙胺的活性,它们分别是A型和B型的基本底物。在所有研究区域中,去甲肾上腺素和肾上腺素都是两种酶形式的底物。发现总MAO活性在下丘脑中最高而在小脑皮质中最低。使用选择性的MAO抑制剂克罗吉林和(β)-异戊二烯基也显示肾上腺素和去甲肾上腺素是大鼠脑中两种酶形式的底物。在人类大脑皮层和大鼠大脑中,发现这两种形式具有相似的K(m)值和对肾上腺素的最大速度。当使用去甲肾上腺素作为底物时,两种形式的这些值在人大脑皮层中也被发现是相似的。相反,MAO-A在大鼠脑中显示出明显更低的K(m)和更高的朝向去甲肾上腺素的最大速度。这些结果表明,该大鼠可能没有为研究MAO抑