Abstract
Parkinson's disease (PD) is a progressive neurodegenerative disorder characterized by the selective degeneration of dopaminergic neurons in the substantia nigra pars compacta resulting in an irreversible and a debilitating motor dysfunction. Though both genetic and idiopathic factors are implicated in the disease etiology, idiopathic PD comprise the majority of clinical cases and is caused by exposure to environmental toxicants and oxidative stress. Fyn kinase activation has been identified as an early molecular signaling event that primes neuroinflammatory and neurodegenerative events associated with dopaminergic cell death. However, the upstream regulator of Fyn activation remains unidentified. We investigated whether the lipid and tyrosine phosphatase PTEN (Phosphatase and Tensin homolog deleted on chromosome 10) could be the upstream regulator of Fyn activation in PD models as PTEN has been previously reported to contribute to Parkinsonian pathology. Our findings, using bioluminescence resonance energy transfer (BRET) and immunoblotting, indicate for the first time that PTEN is a critical early stress sensor in response to oxidative stress and neurotoxicants in in vitro models of PD. Pharmacological attenuation of PTEN activity rescues dopaminergic neurons from neurotoxicant-induced cytotoxicity by modulating Fyn kinase activation. Our findings also identify PTEN’s novel roles in contributing to mitochondrial dysfunction which contribute to neurodegenerative processes. Interestingly, we found that PTEN positively regulates interleukin-1β (IL-1β) and the transcription of nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB). Taken together, we have identified PTEN as a disease course altering pharmacological target that may be further validated for the development of novel therapeutic strategies targeting PD.
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The data that support the findings of this study are available from the corresponding author (Aishwarya Mary Johnson) upon request.
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Acknowledgements
HS is supported by United Arab University Grants - UAE-Research Start-Up 31F129. RG is supported by an Advance Queensland Mid-Career Fellowship and research grants from the Michael J Fox Foundation and the Shake It Up Australia Foundation. MGS provided the Rluc-PTEN-YFP plasmids for this study. The graphical abstract is developed using Biorender.com.
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AMJ and SJ are co-first authors in the study, and contributed equally to experiments. HS, RG and MAA conceptualized the hypothesis and supervised the project. ARP, FBK, NJ, SAAA and JK performed experiments. AMJ and SJ performed majority of the experiments and data analysis under the supervision of HS, RG, MAA, MGS. HS, AMJ, SJ, RG, MAA, contributed to the drafting of the manuscript. All authors read and approved the final manuscript.
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Johnson, A.M., Jose, S., Palakkott, A.R. et al. Pharmacological Inhibition of PTEN Rescues Dopaminergic Neurons by Attenuating Apoptotic and Neuroinflammatory Signaling Events. J Neuroimmune Pharmacol 18, 462–475 (2023). https://doi.org/10.1007/s11481-023-10077-8
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DOI: https://doi.org/10.1007/s11481-023-10077-8