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Assessing Lysosomal Alkalinization in the Intestine of Live Caenorhabditis elegans
Published on: April 13, 2018
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Aging Differentially Affects Axonal Autophagosome Formation and Maturation
Heather Tsong1, Erika Lf Holzbaur2, Andrea Kh Stavoe1
1Department of Neurobiology & Anatomy, McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX, USA.
Autophagy
|July 19, 2023
Summary
Aging impairs neuronal autophagy by decreasing autophagosome formation and disrupting vesicle transport. Early aging shows preserved transport, but late aging leads to significant loss of acidified vesicles and inefficient transport, impacting neuronal health.
Area of Science:
- Neuroscience
- Cell Biology
- Aging Research
Background:
- Neuronal macroautophagy (autophagy) misregulation is linked to neurodegenerative diseases.
- Understanding how aging impacts neuronal autophagy is crucial for addressing age-related neurological decline.
Purpose of the Study:
- To compare autophagosome formation and maturation in primary murine neurons during development and aging.
- To elucidate the specific effects of aging on neuronal autophagy and autophagic vesicle transport.
Main Methods:
- Primary murine neurons were analyzed during development and aging.
- Autophagosome formation, maturation, and vesicle transport efficiency were assessed.
- Endolysosomal content and acidification in the distal axon were quantified.
Main Results:
- Autophagosome formation rate decreased with age, reducing axonal autophagosome density.
- Autophagic vesicle maturation increased in aged neurons.
- Late aging led to a loss of acidified vesicles and impaired autophagic vesicle transport in the distal axon.
Conclusions:
- Early aging preserves autophagic vesicle transport and later stages of autophagy.
- Late aging significantly disrupts neuronal autophagy through impaired vesicle transport and loss of vesicle acidification.
- Aging differentially affects distinct aspects of neuronal autophagy, with late-stage deficits impacting neuronal function.
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