Summary
The activity of tyrosine and tryptophan hydroxylases and of Dopa/ 5-HTP decarboxylase was measured in different structures of the brain of cats administered L-Dopa (100 mg/kg/day,per os) during several consecutive days. The activity of tyrosine hydroxylase which is unchanged after 4 and 7 days of treatment, respectively, is significantly decreased after 21 days of L-Dopa. The activity of tryptophan hydroxylase is normal after 4 days of L-Dopa but it is significantly decreased after 7 and 21 days of L-Dopa, respectively. The activity of decarboxylase is normal after 4 days of L-Dopa but it is significantly increased after 7 and 21 days of L-Dopa, respectively.
Résumé
L'activité des hydroxylases de la tyrosine et du tryptophane et de la décarboxylase de la Dopa et du 5-HTP a été mesurée au niveau de diverses structures du cerveau de chat à la suite d'un traitement chronique à la L-Dopa (100 mg/kg/jour,per os). Après 4 jours de traitement l'activité de ces enzymes demeure normale tandis qu'après 7 et 21 jours, l'activité de Phydroxylase du tryptophane est significativement diminuée et celle de la décarboxylase augmentée. Par ailleurs, l'activité de Phydroxylase de la tyrosine est significativement diminuée après 21 jours de traitement à la L-Dopa.
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Roberge, A.G., Pokier, L.J. Effect of chronically administered L-Dopa on Dopa/5HTP decarboxylase and tyrosine and tryptophan hydroxylases in cat brain. J. Neural Transmission 34, 171–185 (1973). https://doi.org/10.1007/BF01367507
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DOI: https://doi.org/10.1007/BF01367507