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Autophagy core machinery: overcoming spatial barriers in neurons

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Abstract

Autophagy is a major degradation pathway that engulfs, removes, and recycles unwanted cytoplasmic material including damaged organelles and toxic protein aggregates. One type of autophagy, macroautophagy, is a tightly regulated process facilitated by autophagy-related (Atg) proteins that must communicate effectively and act in concert to enable the de novo formation of the phagophore, its maturation into an autophagosome, and its subsequent targeting and fusion with the lysosome or the vacuole. Autophagy plays a significant role in physiology, and its dysregulation has been linked to several diseases, which include certain cancers, cardiomyopathies, and neurodegenerative diseases. Here, we summarize the key processes and the proteins that make up the macroautophagy machinery. We also briefly highlight recently uncovered molecular mechanisms specific to neurons allowing them to uniquely regulate this catabolic process to accommodate their complicated architecture and non-dividing state. Overall, these distinct mechanisms establish a conceptual framework addressing how macroautophagic dysfunction could result in maladies of the nervous system, providing possible therapeutic avenues to explore with a goal of preventing or curing such diseases.

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Acknowledgments

This work was supported by NIH grant GM053396 to D.J.K.

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  1. Life Sciences Institute, University of Michigan, Ann Arbor, MI, 48109, USA

    Aileen R. Ariosa & Daniel J. Klionsky

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  1. Aileen R. Ariosa
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Correspondence to Daniel J. Klionsky.

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Ariosa, A.R., Klionsky, D.J. Autophagy core machinery: overcoming spatial barriers in neurons. J Mol Med 94, 1217–1227 (2016). https://doi.org/10.1007/s00109-016-1461-9

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