Abstract
PTEN-induced kinase 1 (PINK1) mutations can cause early-onset Parkinson’s disease and patients are likely to develop cognitive decline, depression, and dementia. Several neurophysiological studies have demonstrated PINK1 deficiency impairs striatal and hippocampal presynaptic plasticity. Dendritic spine postsynaptic abnormalities are common in neurological diseases; however, whether PINK1 silencing modifies dendritic spine dynamics of hippocampal neurons is unclear. To address this question, confocal images of mouse cultured hippocampal neurons transfected with plasmids to silence PINK1 were analyzed. These studies revealed that PINK1 silencing increased density of thin spines and reduced head size of stubby spines. Immunoblotting analysis uncovered that PINK1 silencing decreased expression of postsynaptic density proteins (PSD95 and Shank) and glutamate receptors (NR2B and mGluR5). We also found PINK1 silencing regulated dendritic spine morphology by actin regulatory proteins (RhoGAP29 and ROCK2) and regulated neuronal survival by decreased Akt activation. These results suggest PINK1 may regulate postsynaptic plasticity in hippocampal neurons generating presymptomatic alterations in dendritic spines that eventually could lead to the neurodegeneration and cognitive decline often seen in Parkinson’s disease.
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This work was supported by Research Division Bogotá-Universidad Nacional de Colombia (DIB-UNAL, Project No. 37405).
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All experiments were conducted in compliance with the National Institutes of Health Guidelines for Care and Use of Experimental Animals and approved by the Institutional Committee of Animal Care and Use at Universidad Nacional de Colombia-Bogotá.
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Hernández, C.J., Báez-Becerra, C., Contreras-Zárate, M.J. et al. PINK1 Silencing Modifies Dendritic Spine Dynamics of Mouse Hippocampal Neurons. J Mol Neurosci 69, 570–579 (2019). https://doi.org/10.1007/s12031-019-01385-x
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DOI: https://doi.org/10.1007/s12031-019-01385-x