Summary
The effects of heterocyclic amines, pyrolysis products of tryp-tophan, on monoamine metabolism were examined. Among these amines, 3-amino-1, 4-dimethyl-5H-pyrido[4,3-b]indole (Trp-P-1) and 3-amino-1-methyl-5H-pyrido[4,3-b]indole (Trp-P-2) are potent inhibitors of the enzymes related to amine metabolism. They inhibited type A monoamine oxidase more markedly than type B. After culture of a dopamine cell model, clonal pheochromocytoma PC12h cells, with Trp-P-1 activity of tyrosine hydroxylase was decreased by reduction of its affinity to the biopterin cofactor. Trp-P-1 and Trp-P-2 inhibited tryptophan hydroxylase competitively with the substrate and non-competitively with biopterin. These results suggest that food-derived heterocyclic amines may perturb the monoamine levels in the brain through the inhibition of the biosynthesis and metabolism of biogenic amines.
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References
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© 1994 Springer-Verlag
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Maruyama, W., Ota, A., Takahashi, A., Nagatsu, T., Naoi, M. (1994). Food-derived hetero-cyclic amines, 3-amino-1,4-dimethyl-5H-pyrido[4,3-b]indole and related amines, as inhibitors of monoamine metabolism. In: Tipton, K.F., Youdim, M.B.H., Barwell, C.J., Callingham, B.A., Lyles, G.A. (eds) Amine Oxidases: Function and Dysfunction. Journal of Neural Transmission, vol 41. Springer, Vienna. https://doi.org/10.1007/978-3-7091-9324-2_43
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DOI: https://doi.org/10.1007/978-3-7091-9324-2_43
Publisher Name: Springer, Vienna
Print ISBN: 978-3-211-82521-1
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