Abstract
The presence of a brain tumor alters regional cerebral blood flow, oxygen consumption, and glucose utilization in adjacent and remote brain tissue, but its effect on brain neurotransmitter levels is unclear. In the present report, the levels of noradrenaline (NA), dopamine (DA), 5-hydroxytryptamine (5-HT), 3,4-dihydroxyphenyl-acetic acid (DOPAC), homovanillic acid (HVA), and 5-hydroxyindole-acetic acid (5-HIAA) in tumor tissue and gray and white matter obtained from cats with induced brain tumors were measured.
Glioma cells (9L) were xenotransplanted into the central white matter of the right hemisphere, and 15 d later the brains were frozen in vivo. Samples of tumor, parietal (peritumor), temporal, and frontal gray and white matter were divided for analysis of water content and quantification of amines and their metabolites. The water content of white matter, but not gray matter, adjacent to the tumor was increased. Neurotransmitter amine and metabolite levels were much lower in the tumor than in brain tissue. In gray matter adjacent to the tumor, concentrations of DA and its metabolites HVA and DOPAC were significantly decreased from control, whereas 5-HIAA was increased. The NA, DA, HVA, and DOPAC levels were decreased in temporal gray matter, whereas all amine and metabolite levels were unchanged in frontal gray matter. These results indicate that altered neurotransmitter metabolism is one of the effects of the presence of a brain tumor.
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Bayens-Simmonds, J., Boisvert, D.P.J. & Baker, G.B. Regional monoamine and metabolite levels in a feline brain tumor model. Molecular and Chemical Neuropathology 10, 63–75 (1989). https://doi.org/10.1007/BF03159714
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DOI: https://doi.org/10.1007/BF03159714