Cited by 159Autophagy in Disease and TherapyGenetic Neurodegenerative DiseasesHereditary Neurological Disorders

Aberrant Membranes and Double-Membrane Structures Accumulate in the Axons of Atg5-Null Purkinje Cells before Neuronal Death

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Nishiyama, Jun, Miura, Eriko, Mizushima, Noboru, Watanabe, Masahiko, Yuzaki, Michisuke·2007·Autophagy

Abstract

Autophagy (macroautophagy) is an evolutionally conserved process by which cytoplasmic proteins and organelles are surrounded by unique double membranes and are subsequently degraded upon fusion with lysosomes. Many autophagy-related genes (Atg) have been identified in yeast; a ubiquitin-like Atg12-Atg5 system is also essential for the elongation of the isolation membrane in mammalian cells. Nevertheless, the regulation of autophagy in neurons remains largely unknown. In this study, we crossed conditional knockout mice Atg5(flox/flox) with pcp2-Cre transgenic mice, which express Cre recombinase through a Purkinje cell-specific promoter, pcp2. In Atg5(flox/flox); pcp2-Cre mice, the Atg5 gene was excised as early as postnatal day 6; Purkinje cells started to degenerate after approximately 8 weeks, and the animals showed an ataxic gait from around 10 months. Initially, however, the Purkinje cells showed axonal swelling around its terminals from as early as 4 weeks after birth. An electron microscopic analysis revealed the accumulation of autophagosome-like double-membrane structures in the swollen regions, together with numerous membranous organelles, such as tubular or sheet-like smooth endoplasmic reticulum and vesicles. These results suggest that Atg5 plays important roles in the maintenance of axon morphology and membrane structures, and its loss of function leads to the swelling of axons, followed by progressive neurodegeneration in mammalian neurons.

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Crossref · 10.4161/auto.4964

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  • Purkinje cells lacking the essential autophagy genes Atg5 or Atg7 die over time.

    “Interestingly, Purkinje cells lacking the essential autophagy genes Atg5 or Atg7 die over time2021.”

    From Clec16a is Critical for Autolysosome Function and Purkinje Cell Survival (2016) · cites this paper as [21]

    The section ‘Deletion of Atg5 in Purkinje cells caused progressive and cell-autonomous neurodegeneration’ reports that Atg5-deficient Purkinje cells began to be lost about eight weeks after birth. The paper also reports progressive neurodegeneration in mice with Atg7 deleted broadly in neural cells, but our copy does not establish that Atg7-deficient Purkinje cells specifically die over time. The passages have no page numbers in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Axons in the deep cerebellar nuclei of mice lacking Atg5 and Atg7 in Purkinje cells displayed increased membranous and vacuole-like structures.

    “axons in the deep cerebellar nuclei of mice lacking Atg5 and Atg7 in Purkinje cells displayed increased membranous and vacuole-like structures”

    From Clec16a is Critical for Autolysosome Function and Purkinje Cell Survival (2016) · cites this paper as [21]

    The ‘Aberrant membranous structures and autophagosome-like organelles’ section reports swollen axons in the deep cerebellar nuclei of mice with Purkinje-cell-specific Atg5 deletion; Figure 4 describes frequent aberrant membranes and autophagosome-like organelles in those axons. The paper does not report this finding for Purkinje-cell-specific Atg7 deletion. Its Introduction mentions Atg7 in other knockout contexts, not in this experiment. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Conditional deletion of the autophagy genes Atg5 or Atg7 in Purkinje cells leads to degeneration of these cells.

    “For example, the conditional deletion of the autophagy genes Atg5 or Atg7 in Purkinje cells leads to degeneration of these cells2021.”

    From Clec16a is Critical for Autolysosome Function and Purkinje Cell Survival (2016) · cites this paper as [21]

    The section “Deletion of Atg5 in Purkinje cells caused progressive and cell-autonomous neurodegeneration” reports that Purkinje-cell-specific Atg5 deletion led to cell loss. A discussion passage also reports neurodegeneration and Purkinje-cell axonal swelling in Atg7-deficient mice, but those mice had nestin-Cre deletion across neural cells, not Purkinje-cell-specific deletion. Page numbers are unavailable in our copy. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Mice with mutations in the autophagy genes Atg5, Atg7, FIP200 and Epg5 show the importance of autophagy in neurons and their stem cell precursors.

    “Mice with mutations in the autophagy genes Atg5, Atg7, FIP200 and Epg5 show the importance of autophagy in neurons and their stem cell precursors20212223.”
  • In several in vivo models, neurons, particularly Purkinje cells, require functional autophagy to survive.

    “In several in vivo models, neurons, and in particular Purkinje cells, demonstrate a striking requirement for functional autophagy in order to survive.”

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Cites

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Research works printed but not linked: 1

  1. Barski JJ, Dethleffsen K, Meyer M. Cre recombinase expression in cerebellar Purkinje cells. Genesis 2000; 28:93-8.

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Authors
Nishiyama, J., Miura, E., Mizushima, N., Watanabe, M., & Yuzaki, M.
Affiliations
  • Keio University (JP)
  • Hokkaido University (JP)
  • Tokyo Medical and Dental University (JP)
Venue
Autophagy
Published
2007-11-26
Volume
3
Issue
6
Pages
591-596
ISSN
  • 1554-8627 (ISSN-L)
  • 1554-8635
OpenAlex
W2000936337
Cited by
159
References
23
Citations by year
2026: 2 · 2025: 8 · 2024: 6 · 2023: 6 · 2022: 7 · 2021: 15 · 2020: 10 · 2019: 13 · 2018: 14 · 2017: 12 · 2016: 6 · 2015: 5 · 2014: 10 · 2013: 11 · 2012: 11
FWCI
4.37
Type
journal article
Language
en
Open access
Locations
  • Autophagy (publishedVersion)
  • PubMed (publishedVersion)
Funders
Ministry of Education, Culture, Sports, Science and Technology
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
Keywords
ATG5, Purkinje cells, axonal swellings, axonal degeneration, neuronal cell death, neurodegeneration, cerebellar ataxia, smooth endoplasmic reticulum
MeSH terms
Autophagy-Related Protein 5, Animals, Axons, Cell Membrane, Microtubule-Associated Proteins, Neurons, Purkinje Cells, Cell Death, Gene Deletion, Mice, Knockout, Cell Shape, Mice

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