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8684964a-bab1-4235-93a8-5fd5e24a1d0a |
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hiynnkoy-3916 |
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xevyo |
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mtorc1 is also involve in |
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mtorc1 is also involve in longevity between specie |
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xevyo |
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xevyo-base-v1 |
| dataset_desc |
This PDF is a scientific editorial from the journa This PDF is a scientific editorial from the journal Aging (2021) that explains how mTORC1, a central nutrient- and energy-sensing cellular pathway, plays a critical role not only in lifespan extension within a single species but also in determining natural longevity differences between mammalian species.
The authors, Gustavo Barja and Reinald Pamplona, summarize recent comparative research showing that long-lived species naturally maintain lower mTORC1 activity, suggesting that downregulated mTORC1 signaling is an evolutionary adaptation that contributes to slower aging and extended longevity.
🔶 1. Background: The Aging Program & Effector Systems
The paper begins by reviewing the nuclear aging program (AP) and the network of aging effectors controlled by it.
These include:
mitochondrial ROS production
mitochondrial DNA repair
lipid composition of membranes
telomere shortening rates
metabolomic/lipidomic profiles
mTORC1 is also involved in long…
Long-lived species show:
low mitochondrial ROS at complex I
high mitochondrial DNA repair
lower unsaturated fatty acids in membranes
slower telomere shortening
mTORC1 is also involved in long…
These differences shape species-specific aging rates.
🔶 2. What is mTORC1 and Why It Matters for Aging?
mTORC1 is a highly conserved cellular signaling hub that integrates information about:
nutrients
energy (ATP, glucose)
amino acids (especially arginine, leucine, methionine)
hormones
oxygen levels
mTORC1 is also involved in long…
mTORC1 regulates:
protein + lipid synthesis
mitochondrial function
autophagy
cell growth and proliferation
stress responses
Within species, lowering mTORC1 activity increases lifespan in yeast, worms, flies, and mammals, while increased mTORC1 accelerates aging.
🔶 3. The New Study: First Cross-Species Analysis of mTORC1 and Longevity
The editorial highlights a new comparative study across eight mammalian species with lifespans ranging from 3.5 years (mouse) to 46 years (horse).
Using droplet digital PCR (ddPCR), Western blotting, and targeted metabolomics, the study measured:
mTORC1 gene expression
mTORC1 protein levels
concentrations of activators and inhibitors
mTORC1 is also involved in long…
🔶 4. Key Findings: Long-Lived Species Naturally Suppress mTORC1
The study found that longer-living mammals consistently exhibit a molecular signature of low mTORC1 activity, including:
A) Activators ↓ (negatively correlated with longevity)
Long-lived species have low levels of:
mTOR
Raptor
Arginine
Methionine
SAM (S-adenosylmethionine)
Homocysteine
mTORC1 is also involved in long…
B) Inhibitors ↑ (positively correlated with longevity)
Long-lived species have higher levels of:
phosphorylated mTOR (mTORSer2448)
PRAS40
mTORC1 is also involved in long…
These patterns were independent of phylogeny, meaning they reflect functional longevity mechanisms, not ancestry.
🔶 5. Interpretation: mTORC1 Is Part of an Evolutionary Longevity Strategy
The authors argue that:
Long-lived species have evolved permanent, natural repression of mTORC1 signaling.
This protects cells from accelerated aging, degenerative diseases, and metabolic stress.
mTORC1 works in coordination with other aging effectors as part of the Cell Aging Regulating System (CARS).
mTORC1 is also involved in long…
This places mTORC1 as a cross-species determinant of longevity, not just a within-species modulator.
🔶 6. Overall Conclusion
The PDF concludes that maintaining low mTORC1 downstream activity during adult life is a conserved biological strategy that increases longevity both within and between mammalian species. This is the first study to show that natural variation in mTORC1 levels across species correlates directly with evolutionary differences in lifespan.
⭐ Perfect One-Sentence Summary
This editorial explains that long-lived mammalian species naturally suppress mTORC1 activity—through lower levels of its activators and higher levels of its inhibitors—revealing mTORC1 as a fundamental, evolutionarily conserved determinant of species longevity.... |
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