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Journals The FASEB Journal June 2009

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Induction of macroautophagy by overexpression of the Parkinson's disease-associated GPR37 receptor

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The orphan G-protein-coupled receptor 37 (GPR37) is a substrate of parkin, and its insoluble aggregates accumulate in brain tissue samples of Parkinson’s disease patients, including Lewy bodies and neurites. Parkin activates the clearance of the unfolded receptor, while the overexpression of GPR37, in the absence of parkin, can lead to unfolded protein-induced cell death. We found that overexpression of the human GPR37 receptor in HEK293 cells and consequent activation of an endoplasmic reticulum (ER) stress response had effects comparable to starvation, in inducing the cellular autophagic pathway. Treatment with specific modulators provided further evidence for the autophagic clearance of the overexpressed GPR37 protein, in detergent-soluble and -insoluble fractions, as confirmed by the conversion of the microtubule-associated protein 1, light chain 3 (LC3)-I marker to its LC3-II isoform. Furthermore, Gpr37 -null mutant mice displayed consistent alterations of ER stress and autophagic pathway markers in brain tissue samples. These findings show that GPR37 overexpression per se can induce cellular autophagy, which may prevent the selective degeneration of GPR37-expressing neurons, as reported for Parkinson’s and related neurodegenerative diseases.—Marazziti, D., Di Pietro, C., Golini, E., Mandillo, S., Matteoni, R., Tocchini-Valentini, G. P. Induction of macroautophagy by overexpression of the Parkinson’s disease-associated GPR37 receptor.

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Article Details
Marazziti, Daniela; Di Pietro, Chiara; Golini, Elisabetta; Mandillo, Silvia; Matteoni, Rafaele; Tocchini-Valentini, Glauco P.
The FASEB Journal , Volume 23 (6): 1978
Fed of American Socs for Experimental Biology – Jun 1, 2009
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