Cited by 181Autophagy in Disease and TherapyCellular transport and secretionUbiquitin and proteasome pathways

Systematic analysis of ribophagy in human cells reveals bystander flux during selective autophagy

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An, Heeseon, Harper, J. Wade·2018·Nature Cell Biology

Abstract

Ribosomes are abundant cellular machines 1,2 that are regulated by assembly, supernumerary subunit turnover and nascent chain quality control mechanisms 1-5 . Moreover, nitrogen starvation in yeast has been reported to promote selective ribosome delivery to the vacuole in an autophagy conjugation system dependent manner, a process called 'ribophagy' 6,7 . However, whether ribophagy in mammals is selective or regulated is unclear. Using Ribo-Keima flux reporters, we find that starvation or mTOR inhibition promotes VPS34-dependent ribophagic flux, which, unlike yeast, is largely independent of ATG8 conjugation and occurs concomitantly with other cytosolic protein autophagic flux reporters 8,9 . Ribophagic flux was not induced upon inhibition of translational elongation or nascent chain uncoupling, but was induced in a comparatively selective manner under proteotoxic stress induced by arsenite 10 or chromosome mis-segregation 11 , dependent upon VPS34 and ATG8 conjugation. Unexpectedly, agents typically used to induce selective autophagy also promoted increased ribosome and cytosolic protein reporter flux, suggesting significant bulk or 'bystander' autophagy during what is often considered selective autophagy 12,13 . These results emphasize the importance of monitoring non-specific cargo flux when assessing selective autophagy pathways.

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  • NUFIP1 has been identified as one receptor involved in ribophagy, particularly in conditions requiring ribosomal recycling.

    “NUFIP1 has been identified as one of the receptors involved in this process, particularly in conditions requiring ribosomal recycling [212].”

    From Ribosome Biogenesis as a Putative Bottleneck to Skeletal Muscle Hypertrophy: Mechanisms, Human Evidence, and Practical Modulators (2026) · cites this paper as [212]

    The passage on ribosomal stress (section labeled Abstract; page unavailable) says that stress may create a need to re-establish ribosome pools and reports increased ribophagic flux under some stress conditions. But our copy does not mention NUFIP1 or identify it as a ribophagy receptor (searched: NUFIP1 and ribophagy receptor). (LLM, conf=0.77)

    Experimental — accuracy not yet measured
  • Although excessive ribophagy could compromise anabolic potential, a basal level of selective turnover is likely necessary to maintain a functional ribosomal pool during repeated cycles of loading and recovery.

    “Although excessive activation of ribophagy could compromise anabolic potential, a basal level of selective turnover is likely necessary to maintain a functional ribosomal pool during repeated cycles of loading and recovery [211,212].”

    From Ribosome Biogenesis as a Putative Bottleneck to Skeletal Muscle Hypertrophy: Mechanisms, Human Evidence, and Practical Modulators (2026) · cites this paper as [212]

    The indexed passage labeled Abstract (page unavailable) reports very low basal ribophagic flux in HEK293 cells and says healthy ribosomes are important for cellular homeostasis. It does not establish that basal turnover is selective or necessary to maintain the ribosomal pool, and it does not examine excessive ribophagy, anabolic potential, or repeated loading and recovery. (LLM, conf=0.84)

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Authors
An, H., & Harper, J. W.
Affiliations
Harvard University (US)
Corresponding author
Harper, J. Wade
Venue
Nature Cell Biology
Published
2017-12-11
Volume
20
Issue
2
Pages
135-143
ISSN
  • 1465-7392 (ISSN-L)
  • 1476-4679
OpenAlex
W2774010248
Cited by
181
References
35
Citations by year
2026: 13 · 2025: 17 · 2024: 25 · 2023: 13 · 2022: 17 · 2021: 25 · 2020: 27 · 2019: 29 · 2018: 15
FWCI
15.20
Type
journal article
Language
en
Open access
Locations
  • Nature Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Digital Access to Scholarship at Harvard (DASH) (Harvard University) (submittedVersion, cc-by)
Funders
  • National Institute of General Medical Sciences (R01GM095567)
  • National Institute of Neurological Disorders and Stroke (R37NS083524)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
ribophagy, selective autophagy, ribosome turnover, Vps34, ATG5, nutrient deprivation, mTOR inhibition, proteotoxic stress, arsenite, chromosome missegregation
MeSH terms
Autophagy-Related Protein 8 Family, Autophagy, Humans, Ribosomes, Vacuoles, Chromosome Segregation, Bystander Effect, Class III Phosphatidylinositol 3-Kinases, TOR Serine-Threonine Kinases

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