Hallmark of aging
Loss of Proteostasis
Last updated 2026-05-17· Last reviewed 2026-07-02· 1 min read
Reviewed by the Ultimate Longevity Bible editorial team. Educational reference — not medical advice. See disclaimer.
What it is
Proteostasis is the set of processes — chaperone-assisted folding, ubiquitin–proteasome degradation, and autophagy — that maintain the proteome in a functional, soluble state. With age, each component falters, and misfolded proteins accumulate as oligomers and aggregates.
Why it matters in aging
Proteostasis collapse underlies most major neurodegenerative diseases: β-amyloid and tau (Alzheimer’s), α-synuclein (Parkinson’s), TDP-43 (ALS/FTD), huntingtin (Huntington’s). It also drives age-related cataracts, cardiac amyloidosis, and sarcopenia.
Mechanisms
- Heat-shock response — chaperone induction blunts with age.
- Ubiquitin–proteasome system — proteasome activity declines.
- Autophagy — macroautophagy and chaperone-mediated autophagy both decline; see Disabled macroautophagy.
- Aggregation — misfolded species template further misfolding (prion-like propagation in several diseases).
What’s being studied
Caloric restriction and rapamycin (via mTOR inhibition) up-regulate autophagy. Small molecules that boost chaperone activity (e.g. arimoclomol) are in clinical trials for specific proteinopathies. The general principle: keep degradation pathways flowing.
- Retro Biosciences — Company.
- Intermittent Fasting — Intervention.
- Spermidine — Intervention.
- Fasting-Mimicking Diet (FMD) — Nutrition entry.
- Autophagy Machinery — Pathway.
Related entries
See also: Disabled macroautophagy, Deregulated nutrient-sensing, Rapamycin.
References
- Hipp, M. S., Kasturi, P. & Hartl, F. U. The proteostasis network and its decline in ageing. Nat. Rev. Mol. Cell Biol. 20, 421–435 (2019).