Abstract
The exact mechanism of gut dysfunction in Parkinson’s disease and, conversely, the role of gut pathology in brain dopaminergic degeneration are controversial. We investigated the effects of nigral lesions on the colonic neurotransmission, the effect of gut inflammation on the nigrostriatal dopaminergic function, and the possible involvement of the vagus nerve and the local renin-angiotensin system (RAS). Nigrostriatal dopamine depletion was performed by bilateral injection 6-hydroxydopamine, and gut inflammation was induced by dextran sulfate sodium salt treatment in rats and mice, respectively, with or without vagal disruption. A decrease in central dopamine levels induced a decrease in colonic dopamine types 1 and 2 receptor expression together with an increase in the colonic levels of dopamine and a decrease in the levels of acetylcholine, which may explain a decrease in gut motility. Central dopaminergic depletion also induced an increase in the colonic levels of inflammatory and oxidative stress markers together with activation of the pro-inflammatory arm of the local RAS. Mice with acute (1 week) or subchronic (3 weeks) gut inflammation did not show a significant increase in colonic α-synuclein and phosphorylated α-synuclein expression during this relatively short survival period. Interestingly, we observed early changes in the nigrostriatal dopaminergic homeostasis, dopaminergic neuron death, and increased levels of nigral pro-inflammatory markers and RAS pro-inflammatory activity. The present results show that a dysregulation of the neural bidirectional gut-brain interaction may explain the early gut disturbances observed in parkinsonian patients, and also the increase in vulnerability of nigral dopaminergic neurons after gut inflammation.
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Abbreviations
- 6-OHDA:
-
6-Hydroxydopamine
- Ach:
-
Acetylcholine
- AngII:
-
Angiotensin II
- AT1:
-
Angiotensin type 1 receptor
- β-ACT:
-
β-Actin
- BBB:
-
Blood-brain-barrier
- CNS:
-
Central nervous system
- D1:
-
Dopamine type 1
- DAI:
-
Disease activity index
- DMV:
-
Dorsal vagal motor nucleus
- DOPAC:
-
3,4-Dihydroxyphenylacetic acid
- DSS:
-
Sulfate sodium salt
- ENS:
-
Enteric nervous system
- GADPH:
-
Glyceraldehyde 3-phosphate dehydrogenase
- GI:
-
Gastrointestinal
- HPLC:
-
High-performance liquid chromatography
- HVA:
-
Homovanillic acid
- IL:
-
Interleukin
- RAS:
-
Renin-angiotensin system
- SN:
-
Substantia nigra
- TH:
-
Tyrosine hydroxylase
- WB:
-
Western blot
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Acknowledgements
We thank Pilar Aldrey, Iria Novoa, and Cristina Gianzo for their technical assistance.
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This study is financially supported by Spanish Ministry of Economy and Competitiveness (BFU2015-70523), Spanish Ministry of Health (RD12/0019/0020, RD16/0011/0016 and CIBERNED), Galician Government (XUGA, Conselleria de Educacion; GRC2014/002), and FEDER (Regional European Development Fund).
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JLL-G and PG-G conceived and supervised the whole study and wrote the manuscript; PG-G performed the experimental models and lesions; AD-M and PG-G performed HPLC analysis; and AR-P and MJG performed WB and PCR analyses. All authors edited the manuscript.
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All procedures performed in studies involving animals were in accordance with with the European Directive 2010/63/EU and the Spanish RD/53/2013 for the protection of animals used for scientific purposes and were approved by the corresponding committee of the University of Santiago de Compostela (Spain) and the Galician Government (XUGA).
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Garrido-Gil, P., Rodriguez-Perez, A.I., Dominguez-Meijide, A. et al. Bidirectional Neural Interaction Between Central Dopaminergic and Gut Lesions in Parkinson’s Disease Models. Mol Neurobiol 55, 7297–7316 (2018). https://doi.org/10.1007/s12035-018-0937-8
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DOI: https://doi.org/10.1007/s12035-018-0937-8