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| Home > Articles > Published articles > Spontaneous changes in brain striatal dopamine synthesis and storage dynamics ex vivo reveal end-product feedback-inhibition of tyrosine hydroxylase |
(Universitat Autònoma de Barcelona. Institut de Neurociències) (Universitat Autònoma de Barcelona. Institut de Neurociències) (Universitat Autònoma de Barcelona. Institut de Neurociències) (Universitat Autònoma de Barcelona. Institut de Neurociències) (Universitat Autònoma de Barcelona. Institut de Neurociències) (Universitat Autònoma de Barcelona. Institut de Neurociències) (Institut d'Investigacions Biomèdiques de Barcelona) (Institut d'Investigacions Biomèdiques August Pi i Sunyer) (Universitat Autònoma de Barcelona. Institut de Neurociències) (Universitat Autònoma de Barcelona. Institut de Neurociències)| Date: | 2022 |
| Abstract: | Synaptic events are important to define treatment strategies for brain disorders. In the present paper, freshly obtained rat brain striatal minces were incubated under different times and conditions to determine dopamine biosynthesis, storage, and tyrosine hydroxylase phosphorylation. Remarkably, we found that endogenous dopamine spontaneously accumulated during tissue incubation at 37 °C ex vivo while dopamine synthesis simultaneously decreased. We analyzed whether these changes in brain dopamine biosynthesis and storage were linked to dopamine feedback inhibition of its synthesis-limiting enzyme tyrosine hydroxylase. The aromatic-l-amino-acid decarboxylase inhibitor NSD-1015 prevented both effects. As expected, dopamine accumulation was increased with l-DOPA addition or VMAT2-overexpression, and dopamine synthesis decreased further with added dopamine, the VMAT2 inhibitor tetrabenazine or D2 auto-receptor activation with quinpirole, accordingly to the known synaptic effects of these treatments. Phosphorylation activation and inhibition of tyrosine hydroxylase on Ser31 and Ser40 with okadaic acid, Sp-cAMP and PD98059 also exerted the expected effects. However, no clear-cut association was found between dopamine feedback inhibition of its own biosynthesis and changes of tyrosine hydroxylase phosphorylation, assessed by Western blot and mass spectrometry. The later technique also revealed a new Thr30 phosphorylation in rat tyrosine hydroxylase. Our methodological assessment of brain dopamine synthesis and storage dynamics ex vivo could be applied to predict the in vivo effects of pharmacological interventions in animal models of dopamine-related disorders. |
| Grants: | Ministerio de Educación y Ciencia SAF2006- 08240 Ministerio de Ciencia e Innovación SAF2009-12510 Agencia Estatal de Investigación SAF2017-87199-R Agencia Estatal de Investigación SAF2016-77541-R |
| Note: | Altres ajuts: acords transformatius de la UAB |
| Note: | Altres ajuts: , The Michael J. Fox Foundation (ID15291), "la Caixa" Foundation (ID 100010434), under the agreement LCF/PR/HR17/52150003 |
| Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.  |
| Language: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Subject: | Striatum ; HPLC ; VMAT2 ; Tetrabenazine ; Quinpirole |
| Published in: | Neuropharmacology, Vol. 212 (07 2022) , ISSN 1873-7064 |
