Publication Date:
1987-01-23
Description:
The regional distributions of monoamine oxidase (MAO) types A and B have been identified in human brain in vivo with intravenously injected 11C-labeled suicide enzyme inactivators, clorgyline and L-deprenyl, and positron emission tomography. The rapid brain uptake and retention of radioactivity for both 11C tracers indicated irreversible trapping. The anatomical distribution of 11C paralleled the distribution of MAO A and MAO B in human brain in autopsy material. The corpus striatum, thalamus, and brainstem contained high MAO activity. The magnitudes of uptake of both [11C]clorgyline and L-[11C]deprenyl were markedly reduced in one subject treated with the antidepressant MAO inhibitor phenelzine. A comparison of the brain uptake and retention of the 11C-labeled inactive (D-) and active (L-) enantiomers of deprenyl showed rapid clearance of the inactive enantiomer and retention of the active enantiomer within MAO B-rich brain structures, in agreement with the known stereoselectivity of MAO B for L-deprenyl. Prior treatment with unlabeled L-deprenyl prevented retention of L-[11C]deprenyl. Thus, suicide enzyme inactivators labeled with positron emitters can be used to quantitate the distribution and kinetic characteristics of MAO in human brain structures.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fowler, J S -- MacGregor, R R -- Wolf, A P -- Arnett, C D -- Dewey, S L -- Schlyer, D -- Christman, D -- Logan, J -- Smith, M -- Sachs, H -- NS-15638/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Jan 23;235(4787):481-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3099392" target="_blank"〉PubMed〈/a〉
Keywords:
Adult
;
Aged
;
Aged, 80 and over
;
Brain/*enzymology
;
Brain Stem/enzymology
;
Cerebral Cortex/enzymology
;
Clorgyline
;
Corpus Striatum/enzymology
;
Humans
;
Monoamine Oxidase/*metabolism
;
Selegiline
;
Thalamus/enzymology
;
Tomography, Emission-Computed
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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