Abstract
Gut microbiota disturbance and systemic inflammation have been implicated in the degeneration of dopaminergic neurons in Parkinson’s disease (PD). How the alteration of gut microbiota results in neuropathological events in PD remains elusive. In this study, we explored whether and how environmental insults caused early neuropathological events in the substantia nigra (SN) of a PD mouse model. Aged (12-month-old) mice were orally administered rotenone (6.25 mg·kg−1·d−1) 5 days per week for 2 months. We demonstrated that oral administration of rotenone to ageing mice was sufficient to establish a PD mouse model and that microglial activation and iron deposition selectively appeared in the SN of the mice prior to loss of motor coordination and dopaminergic neurons, and these events could be fully blocked by microglial elimination with a PLX5622-formulated diet. 16 S rDNA sequencing analysis showed that the gut microbiota in rotenone-treated mice was altered, and mice receiving faecal microbial transplantation (FMT) from ageing mice treated with rotenone for 2 months exhibited the same pathology in the SN. We demonstrated that C-X-C motif chemokine ligand-1 (CXCL1) was an essential molecule, as intravenous injection of CXCL1 mimicked almost all the pathology in serum and SN induced by oral rotenone and FMT. Using metabolomics and transcriptomics analyses, we identified the PPAR pathway as a key pathway involved in rotenone-induced neuronal damage. Inhibition of the PPARγ pathway was consistent in the above models, whereas its activation by linoleic acid (60 mg·kg−1·d−1, i.g. for 1 week) could block these pathological events in mice intravenously injected with CXCL1. Altogether, these results reveal that the altered gut microbiota resulted in neuroinflammation and iron deposition occurring early in the SN of ageing mice with oral administration of rotenone, much earlier than motor symptoms and dopaminergic neuron loss. We found that CXCL1 plays a crucial role in this process, possibly via PPARγ signalling inhibition. This study may pave the way for understanding the “brain-gut-microbiota” molecular regulatory networks in PD pathogenesis.
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Data availability
The data that support the findings of this study are available from the corresponding authors upon reasonable request.
Materials availability
The materials that support the findings of this study are available from the corresponding authors upon reasonable request.
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Acknowledgements
This work was supported by grants from the National Natural Science Foundation of China (32170984, 31871049), the Excellent Innovative Team of Shandong Province and the Taishan Scholars Construction Project, and the Natural Science Foundation of Shandong Province (ZR2023QH110, ZR2020YQ23, and ZR2021MC116).
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XZM performed experiments and composed the first draft, NS guided the experiment, polished, and finalised the article, JW and LLC guided the experiment, LQ and HL performed experiments, JXX conceived and directed the project. All authors read and approved the final manuscript.
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The study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Ethics Committee of the Medical College of Qingdao University (QDU-AEC-2022116, March 1, 2022).
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Ma, Xz., Chen, Ll., Qu, L. et al. Gut microbiota-induced CXCL1 elevation triggers early neuroinflammation in the substantia nigra of Parkinsonian mice. Acta Pharmacol Sin 45, 52–65 (2024). https://doi.org/10.1038/s41401-023-01147-x
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DOI: https://doi.org/10.1038/s41401-023-01147-x