The mTOR Pathway: A Master Regulatory Hub in Aging and Lifespan

mTOR functions as a conserved metabolic “switchboard” integrating cellular energy status, growth factors, and amino acid availability to coordinate タンパク質タンパク質は、体内の筋肉や組織の構築と修復に使用される栄養素です。. synthesis, オートファジーAutophagy is a cellular housekeeping process by which cells break down and recycle damaged proteins and organelles; in arterial macrophages, it helps clear lipid debris and prevents the accumulation of plaque. The article's 2024 Nature Metabolism finding suggests that high single-meal protein doses may suppress autophagy in these immune cells, potentially worsening atherosclerosis in animal model…, mitochondrial metabolism, and stress responses [1,2]. Across model organisms—including yeast, flies, and mice—age-associated increases in anabolic signaling and reduced autophagic clearance are repeatedly linked to functional decline and shortened lifespan, implicating excessive mTORC1 activity as a contributor to aging biology rather than a neutral correlate [1–3].

Molecular Architecture of mTOR Complexes

mTOR exists in two functionally and structurally distinct complexes: mTORC1 and mTORC2. While both share the catalytic mTOR subunit, their scaffolds determine substrate specificity and biological outputs. mTORC1 is the nutrient-sensitive complex, defined by RAPTOR, and regulates translation through targets such as S6K1 and 4E-BP1 [2,3]. mTORC2 is defined by RICTOR and plays a major role in cytoskeletal organization and Akt-mediated survival signaling [2].

Hyperactivation of mTORC1 in mid- and late life is mechanistically linked to age-associated pathology, including cancer-promoting growth signaling, impaired proteostasisThe cellular maintenance of a stable, functional protein pool through the coordinated balance of protein synthesis, folding, and degradation pathways including autophagy and the ubiquitin-proteasome system; its impairment with age allows damaged proteins to accumulate and is linked to neurodegeneration and other age-related diseases., metabolic dysfunction, and vascular disease [2–4]. By promoting continuous translation while suppressing autophagy (including mitophagyMitophagy is the cellular process by which damaged or dysfunctional mitochondria are selectively identified and broken down, serving as a quality-control mechanism; impaired mitophagy has been proposed as a contributor to vascular aging, though the evidence in humans remains largely preclinical.), excessive mTORC1 activity can accelerate accumulation of damaged organelles and misfolded proteins—functionally “clogging” cellular maintenance systems and amplifying senescence-associated phenotypes [2,4].

Table 1. Structural Components and Regulatory Functions of mTORC1

Component	Function	Role in aging signaling
mTOR	Catalytic Ser/Thr kinase	Master integrator of nutrient and energy signals [2]
RAPTOR	Substrate recruitment scaffold	Enables phosphorylation of S6K1 and 4E-BP1 [2,3]
mLST8	Kinase-domain stabilizer	Supports structural integrity and signaling output [2]
DEPTOR	Endogenous inhibitor	Reduced expression/activity can disinhibit mTOR signaling [2]
PRAS40	Akt-regulated inhibitor	Links インスリンInsulin is a hormone made by your pancreas. Its main job is letting sugar move out of your blood and into your cells for fuel./Akt signaling to mTORC1 activation [2]
Tti1/Tel2	Assembly/stability factors	Required for proper complex formation [2]

Interventions targeting mTOR. Pharmacologic inhibition of mTORC1 with ラパマイシンA pharmacologic inhibitor of mTORC1 that reproducibly extends lifespan and healthspan in multiple model organisms, including mice, even when started late in life; it is used experimentally to study the role of mTOR in aging, though its clinical use in healthy humans for longevity remains investigational. and nutritional interventions such as caloric restriction (CR)A sustained reduction in calorie intake without malnutrition that consistently downregulates growth signaling, enhances autophagy, and extends lifespan in a wide range of organisms; it is considered one of the most reproducible pro-longevity interventions in experimental biology. are among the most reproducible lifespan- and healthspan-extending strategies across model systems [1–3]. In mice, rapamycin can extend lifespan even when initiated later in life, supporting the view that mTOR remains modifiable across the aging trajectory [1]. CR consistently downshifts growth signaling, enhances autophagy, and preserves metabolic efficiency. It is more accurate to describe mTOR inhibition/CR as among the most consistent pro-longevity interventions across taxa rather than the only such intervention, as multiple manipulations (eg, genetic insulin/IGF signaling changes) also extend lifespan in specific organisms [1–3].

The Anabolic Resistance Continuum and Leucine Signaling

As humans transition from young adulthood to late-stage aging (often operationalized as ≥65 years), skeletal muscle progressively exhibits 同化抵抗性同化抵抗性とは、高齢者の筋肉がタンパク質に対して十分に反応しなくなる現象のことです。若い人であれば、適量のタンパク質を摂取することで筋肉を大きくすることができますが、高齢者が同じ量を摂取しても、筋肉はほとんど大きくなりません。.—a blunted stimulation of muscle protein synthesis (MPS)Muscle protein synthesis is the cellular process by which muscle fibers build new contractile proteins, driven by amino acid availability and mechanical loading; the rate of MPS relative to muscle protein breakdown determines whether muscle mass is gained, maintained, or lost. In older adults, the MPS response to a given protein dose is blunted compared with younger adults. in response to dietary protein and resistance exercise [5,6]. In younger individuals, modest high-quality protein doses can trigger robust MPS. In older adults, the “anabolic threshold” rises; greater essential amino acid (EAA) availability—particularly ロイシンLeucine is one of the building blocks of protein, and the one that acts as a switch telling muscle to start rebuilding itself.—is needed to activate translation initiation and achieve comparable MPS responses [5–7]. Contributing mechanisms include impaired perfusion and amino acid delivery, reduced インスリン感受性インスリン感受性とは、細胞がインスリンに対してどれだけよく反応するかということです。それはインスリン抵抗性の反対です。., altered muscle intracellular signaling, and chronic low-grade 炎症炎症は、怪我や侵入物とみなしたものに対する免疫システムの反応です。これにより腫れや熱、そして浄化細胞がもたらされます。. [5,6].

The Sestrin2–Leucine Sensor Mechanism

Leucine is distinctive among branched-chain amino acids because it acts as both substrate and signal for mTORC1 activation. セストリン2Sestrin2 is an intracellular sensor protein that detects leucine levels inside the cell and relays that signal to mTORC1; when leucine is abundant, Sestrin2 releases an inhibitory brake on mTORC1, allowing muscle protein synthesis to proceed. It is part of the GATOR2–leucyl-tRNA-synthetase axis that links dietary protein intake to anabolic signaling. functions as a cytosolic leucine sensor that regulates mTORC1 through the GATOR2 complexA multiprotein complex that acts as a positive regulator of mTORC1 by transmitting leucine availability signals from Sestrin2 to the Rag GTPases, which then recruit mTORC1 to the lysosomal surface for activation. and Rag GTPases [8,9]. In low-leucine conditions, Sestrin2 restrains GATOR2, suppressing Rag activation and limiting mTORC1 lysosomal recruitment [8,9]. When leucine is abundant, it binds a conserved hydrophobic pocket on Sestrin2, triggering a conformational shift that disrupts Sestrin2–GATOR2 interaction and permits downstream activation of mTORC1 [8,9]. Structural work demonstrates specificity determinants that favor leucine over valine/isoleucine, including hydrophobic complementarity and coordinated recognition of leucine’s amino and carboxyl groups [8,9].

Thresholds for Bypassing Anabolic Resistance

For practical geronutrition, the key issue is not whether leucine signals mTORC1, but how much leucine exposure is needed to overcome anabolic resistance. Observational breakpoint analyses in older adults have identified a plateau for daily leucine intake associated with lower-limb muscle mass and strength at approximately 7.6–8.0 g/day, equivalent to roughly 110–115 mg/kg/day in typical older cohorts [10]. In parallel, controlled feeding and expert consensus guidance commonly emphasize that older adults often require ~2.5–3.0 g leucine per meal (usually delivered by ~25–40 g high-quality protein) to robustly stimulate MPS [6,7]. Indicator amino acid oxidation methods further suggest leucine requirements in older adults may exceed current recommendations, supporting the concept that leucine can become limiting when protein quality or total intake is low [11].

Table 2. Comparative Protein and Leucine Targets Across the Aging Spectrum

メトリック	Young adulthood (20–40)	Late-stage aging (65–85)	Centenarians (100+)
Protein RDA (minimum)	0.8 g/kg/day	0.8 g/kg/day (often insufficient)	0.8 g/kg/day (often insufficient)
Practical daily protein target	~0.8–1.0 g/kg/day	~1.0–1.2 g/kg/day (higher if frail) [6]	individualized; often ≥1.0 g/kg/day if tolerated and safe [6]
Per-meal protein	~20–30 g	~25–40 g (distributed evenly) [6,7]	similar or higher density per meal if appetite limited
Leucine per meal	~1.5–2.5 g	~2.5–3.0 g (leucine-dense) [6,7]	high density often required; appetite constraints dominate
Anabolic response	high sensitivity	blunted (resistant) [5]	severe resistance likely; distribution critical
Autophagy status	relatively efficient	often impaired	heterogeneous; may be selectively preserved in resilient phenotypes

The clinical implication is that strict reliance on the standard protein RDA may be inadequate for preserving mobility and independence in many older adults, particularly when appetite declines and energy intake falls [6]. Protein quality, leucine density, and distribution across meals become increasingly central to maintaining functional reserve.

Cardiovascular Transitions: From 動脈硬化症動脈硬化は、ほとんど的心筋梗塞と多くの脳卒中の背景にある病気です。コレステロールの粒子が動脈の壁に入り込み、体がそれを掃除するために免疫細胞を送り込み、何年もかけてその堆積物が硬化してプラークになります。. へ Heart Failure心不全とは、心臓が体の要求を満たすのに十分なほど血液を送り出せない状態を指します。心不全という名前は誤解を招きやすいですが、心臓が停止したという意味ではありません。. and Dementia

In the context of longevity, the cardiovascular system follows a distinct trajectory of adaptation and decline. Subclinical atherosclerosisSubclinical atherosclerosis means plaque is present but has not yet caused any symptoms or events. is common in the 70s and 80s, but among the oldest old, dominant causes of disability and death often shift toward heart failure, frailty, and dementia, reflecting cumulative myocardial remodeling, arterial stiffening, and 微小血管機能障害Microvascular dysfunction is disease in the smallest blood vessels of the heart, too small to see on any angiogram. [12–14]. This does not imply coronary disease disappears; rather, the clinical expression of 血管老化The progressive structural and functional deterioration of arteries over time, characterized by loss of elasticity, increased stiffness, and accumulation of microscopic damage that makes arterial walls more susceptible to lipid deposition and chronic inflammation. increasingly involves brain and heart failure phenotypes.

Subclinical Atherosclerosis and Cognitive Risk

冠状動脈 動脈動脈は、心臓から全身へ血液を送り出す血管です。. 石灰化石灰化とは、カルシウムがプラークに沈着し、その一部が硬く骨状になることです。. (CAC) is a robust marker of cumulative atherosclerotic burden. Multiple studies link higher CAC to worse brain structure and function, as well as increased risk for cognitive impairment and dementia endpoints in older adults [12,13]. Recent work also suggests that progression of CAC may carry incremental dementia risk signals in 前向きコホート前向きコホート研究は、健康な人々を登録し、その特徴を記録し、その後何が起こるかを待って観察する。. [14]. The mechanistic bridge is plausibly shared vascular aging: 内皮機能障害血管内皮機能障害とは、その薄い内側の裏打ちが十分に機能しなくなる状態です。血管が適切に拡張せず、バリア機能がより漏れやすくなります。., impaired cerebral perfusion, microinfarction burden, and pro-inflammatory signaling that accelerates neurodegenerative vulnerability [15].

Vascular Stiffness as a Driver of Endothelial Senescence

A critical concept in cardiovascular aging is that vascular stiffness is not merely the consequence of 歯垢プラークとは、動脈の壁の内側にコレステロール、免疫細胞、瘢痕組織、カルシウムが蓄積したものです。. accumulation, but can function as a mechanobiological driver of endothelial dysfunction. Stiffening driven by エラスチンElastin is a structural protein in the arterial wall that allows blood vessels to stretch and recoil with each heartbeat; with age it degrades and is replaced by stiffer collagen, contributing to arterial stiffening and rising systolic blood pressure. degradation, collagen remodeling, and cross-linking increases endothelial stress and alters 機械受容シグナル伝達メカノトランスダクション（機械的刺激受容伝達）は、細胞が伸展、圧力、ずり応力などの機械的刺激を、細胞の挙動や遺伝子発現を変化させる生化学的シグナルへと変換する生物学的プロセスです。. pathways. Experimental and integrative vascular-aging literature supports that increased stiffness and altered flow promote pro-senescent signaling programs and inflammatory mediator production consistent with endothelial aging phenotypes [16,17]. This contributes to a feed-forward loop in which stiffness amplifies inflammation and remodeling, and inflammation further accelerates 細胞外マトリックスThe extracellular matrix is the scaffolding of collagen and other fibers that holds tissue together and gives an artery wall its strength. dysfunction [16,17].

Table 3. Cardiovascular バイオマーカーバイオマーカーとは、健康や病気の状態について教えてくれる、体内で測定可能なもののことであり、例えば、検査値、スキャン画像の結果、血圧の数値などが挙げられます。. and Risk Context in Exceptional Longevity

Biomarker / feature	Standard aging (80s)	Centenarians (100+)	Implications for survival
NT-proBNPNT-proBNP (N-terminal pro-B-type natriuretic peptide) is a cardiac biomarker released into the bloodstream when the heart muscle is under mechanical stress or pressure overload; elevated levels in otherwise asymptomatic adults can signal early heart failure or advancing cardiovascular disease before any symptoms appear.	often elevated with age	relatively lower in exceptionally surviving subgroups	lower NT-proBNP associated with survival advantage at highest ages [18]
CAC burden	commonly present	variable; lower burden supports brain/血管のレジリエンスVascular resilience describes a phenotype in which an individual's arterial wall is relatively resistant to plaque development despite sustained exposure to elevated ApoB-containing lipoproteins; proposed mechanisms include reduced endothelial permeability, lower proteoglycan retention, or attenuated inflammatory signaling, though no clinical test currently identifies this trait.	higher CAC linked to worse brain outcomes and dementia risk [12–14]
Vascular stiffness	often increased	preserved elasticity in resilient phenotypes	reduces endothelial stress and supports microvascular health [16,17]
Albumin	declines with age/inflammation	higher albumin signals better reserve	low albumin associates with higher mortality across age groups [18]

A particularly strong and reproducible marker in studies of the “oldest old” is NT-proBNP. In aggregated longitudinal cohorts including centenarians and (semi-)supercentenarians, the relationship between NT-proBNP and mortality remains robust even after accounting for traditional 危険因子危険因子とは、高コレステロール粒子、高血圧、喫煙、糖尿病、家族歴など、病気にかかる可能性を高めるものです。. and measures of organ reserve [18]. These findings support the view that resistance to myocardial wall stress and subclinical heart failure physiology is a key component of exceptional survival.

The Nutritional “Switch”: The Critical Threshold Around Age 65

One of the most important translational insights in longevity research is that the optimal nutritional strategy is not static across the lifespan. A major “metabolic switch” occurs around ~65 years, where the risk–benefit ratio associated with protein intake and growth signaling changes meaningfully.

The Middle-Age Low-Protein Benefit

During midlife, lower protein intake patterns have been associated with lower IGF-1 signaling and reduced cancer risk in some cohorts, consistent with the view that chronic growth signaling can be deleterious when repair and surveillance mechanisms begin to degrade [19]. In this phase, the nutritional goal often emphasizes insulin sensitivity, 代謝の健康Metabolic health describes how well your body handles blood sugar, blood pressure, fats, and body fat storage., and periodic activation of maintenance pathways such as autophagy—achieved through patterns like modest protein intake, time-restricted eating, or caloric moderation [2,19].

The Late-Life High-Protein Requirement

After ~65, the risk profile flips. Low protein intake becomes strongly linked to adverse outcomes driven by サルコペニアSarcopenia is the progressive loss of muscle mass and strength that comes with age., frailty, falls, and reduced immune competence [6,19]. Higher protein intake supports maintenance of muscle mass, functional reserve, and immune responsiveness—systems that become increasingly vulnerable with age [6]. In older adults, protein distribution and leucine density become particularly important as appetite declines and energy needs fall, making nutrient density (not just calories) decisive.

Consistent with this, a prospective study in Japanese adults aged 85–89 years without baseline disability (Kawasaki Aging and Wellbeing Project) reported lower 全因死亡率全死因死亡とは、心疾患に限らず、あらゆる原因による死亡を意味し、研究が測定できる最も広範で、ごまかしが最も効かない結果です。. risk in the highest versus lowest protein intake groups after adjustment for clinical covariates, supporting the concept that higher protein intake can be protective in very old age when functional independence is maintained [20]. Importantly, protein source and food context remain relevant; broader cohort evidence suggests that substituting plant proteins for some animal protein sources—particularly red/processed meat—may improve long-term outcomes in general populations [21].

Proteomic and Genetic Markers of Centenarian Resilience

Centenarians do not “escape” aging; they often delay disease onset and compress morbidity. Systems-level profiling increasingly supports the existence of protective biomarker constellations in extreme longevity cohorts. Large-scale biomarker work in the oldest old identifies profiles consistent with preserved organ reserve and lower heart-failure physiology among those reaching the highest ages, with NT-proBNP emerging as a particularly informative marker [18]. At the same time, proteomic patterns in exceptionally long-lived groups often reflect altered inflammatory tone and metabolic efficiency rather than uniform upregulation of classical “defense” proteins.

The Redox and Antioxidant “Paradox”

A recurring interpretive pitfall is to equate lower abundance of certain antioxidant-associated proteins with weaker defenses. In resilient aging phenotypes, lower expression of some stress-response proteins can reflect lower upstream oxidative burden, driven by more efficient mitochondria and reduced chronic inflammatory signaling. In other words, redox homeostasis may be achieved through reduced reactive species production rather than constant maximal 抗酸化物質抗酸化物質とは、体内にある有害な分子を取り除く物質です。ビタミンEやベータカロテンはその例です。. deployment. This framing aligns with mechanistic and epidemiologic literature linking 酸化ストレス酸化ストレスとは、有害な活性分子と、それらを中和する身体の能力との間の不均衡です。. pathways to cognitive outcomes and heterogeneity in brain aging trajectories [13].

Genetic Variants and Disease Delay

Genetic contributions to exceptional longevity appear to function largely through disease delay rather than prevention of aging itself. Among repeatedly implicated loci in long-lived populations are アポリポ蛋白EAPOE is a gene that comes in three common versions, labeled E2, E3, and E4. It controls how efficiently your liver clears leftover fat particles. (particularly APOE2 enrichment), FOXO3A variants associated with stress response and insulin signaling regulation, and lipid-related pathways including CETP-associated traits [22]. These variants plausibly support vascular and metabolic resilience, lowering the probability that age-related insults cross clinical thresholds.

Table 4. Key Molecular Mechanisms and Their Influence on Longevity

メカニズム	Physiological impact	Role in longevity
Mitophagy	selective mitochondrial quality control	limits ROS from dysfunctional mitochondria; supports energetic resilience [23]
Proteostasis	balanced synthesis, folding, and degradation	reduces accumulation of aggregated proteins and organelle dysfunction [2,4]
Metabolic flexibility	switching between fuel sources	supports low baseline insulin and adaptive stress response [2,3]
Epigenetic stability	maintenance of gene regulation	may reduce maladaptive activation of growth/senescence programs [3]
Vascular compliance	preserved arterial elasticity	lowers wall stress and supports brain/heart microvascular function [15–17]

Precision Geronutrition and Emerging Gerotherapeutics

As geroscience matures, the integration of nutritional strategy with pharmacologic interventions targeting hallmarks of aging has become a major frontier.

Targeted Pharmacologic Interventions (Evidence-Calibrated)

• Rapamycin/rapalogs: Among the most robust lifespan-extending interventions in animal models [1–3]. In humans, early clinical work suggests that mTOR inhibition can improve certain immune parameters in older adults, supporting geroscience relevance, though lifespan extension remains unproven [24].
• GLP-1受容体作動薬GLP-1 receptor agonists are injectable medicines — semaglutide and tirzepatide are the best known — that copy a gut hormone controlling appetite and blood sugar.: Demonstrate strong cardiometabolic and cardiovascular outcome benefits in randomized trials in 糖尿病糖尿病は、体が十分なインスリンを作らないか、あるいは作られたインスリンに反応しなくなることで、血糖値が常に高すぎる状態になる疾患です。., with secondary relevance to aging biology via reductions in adiposity, inflammation, and cardiometabolic risk [25].
• SGLT2阻害薬SGLT2 inhibitors are diabetes pills that make the kidneys flush excess sugar out in the urine.: Provide substantial reductions in heart failure hospitalization and cardiovascular mortality in randomized outcome trials, suggesting preservation of cardiovascular resilience; mechanistic links to mitochondrial energetics and inflammation are plausible, but claims of telomere lengthening or definitive geroprotection should be treated as investigational [26].
• Urolithin A: A 腸内マイクロバイオームThe gut microbiome is the enormous community of bacteria living in your intestines. There are trillions of them, and they are not passive passengers.–derived postbiotic that activates mitophagy pathways; randomized trial evidence indicates improvements in muscle performance and mitochondrial biomarker profiles in middle-aged adults, supporting a plausible role in mitochondrial quality control [27].

The Role of Caloric Restriction in Brain Health

The brain exhibits distinct vulnerabilities with age, including white matter and myelin integrity decline, microglial inflammatory shifts, and reduced metabolic resilience. High-resolution mapping studies in aging models indicate that caloric restriction can preserve region-specific gene programs linked to myelin maintenance, reduce expression of aging-associated inflammatory pathways, and support cellular states associated with neuroprotection [28]. While translating decades-long caloric restriction to humans is not straightforward, these findings support the concept that sustained metabolic moderation can preserve neurovascular and white matter biology relevant to cognitive resilience.

Regional Insights and Policy Impacts on Longevity

Longevity outcomes are not determined solely by biology; food environments and policy structures shape exposure to 超加工食品Industrial food products formulated from refined ingredients and additives—such as emulsifiers, colorings, and flavor enhancers—with little resemblance to whole foods; both plant-based and animal-based ultra-processed products are associated with increased cardiovascular risk, validating the article's argument that processing level matters as much as food source., dietary quality, and nutrition literacy. Public health tools that reduce decision friction may therefore have outsized effects on population-level cardiometabolic aging.

Front-of-Package Labeling and Nutrition Literacy

Randomized evidence indicates that front-of-package labeling systems—including label designs similar to the FDA’s proposed “Nutrition Info” concept—can improve consumer understanding and nudge healthier selection patterns in simulated purchasing tasks [29,30]. Effects can vary by nutrition literacy and sociodemographic factors; graded, spectrum-style labels may reduce disparities in comprehension by providing clearer comparative signals across products [29,30]. Such findings are relevant to longevity because small, sustained improvements in diet quality can compound over decades.

Oxidative Stress Vulnerability as a Precision Target

Individual vulnerability to oxidative stress and inflammatory signaling varies. Genetic and causal inference studies support a relationship between oxidative stress pathways and cognitive outcomes, suggesting that redox biology may contribute to heterogeneity in brain aging trajectories [13]. This reinforces a precision nutrition perspective: some individuals may benefit disproportionately from early optimization of cardiometabolic risk, dietary quality, and interventions that reduce chronic inflammation and oxidative burden.

Conclusion: A Lifetime Roadmap for Nutritional Longevity

Achieving exceptional longevity requires a strategic transition in nutritional priorities aligned to the biological realities of aging. Survival into the 11th decade appears supported by preserved mitochondrial quality control, maintained vascular compliance, and nutritional adequacy sufficient to overcome anabolic resistance despite declining appetite and physiologic reserve.

Recommended Nutritional Protocol for Longevity Transitions

• Early-to-mid life (20–65): Emphasize metabolic health and periodic downshifts in growth signaling (eg, caloric moderation or time-restricted eating). Maintain moderate protein intake and prioritize dietary patterns that support cardiometabolic health and lower chronic inflammation.
• Late-life transition (65–80): Increase protein toward ~1.0–1.2 g/kg/day as tolerated and clinically appropriate, with attention to per-meal distribution. Prioritize leucine-dense protein servings targeting ~2.5–3.0 g leucine per meal to support MPS signaling in anabolic resistance [6,7].
• Extreme old age (80–100+): Focus on nutrient density and feasible distribution across meals; appetite and chewing/swallowing constraints dominate. Monitor markers of cardiovascular stress (eg, NT-proBNP) and preserve vascular health through 血圧血圧とは、血液が動脈の壁を押す力ののことです。120/80のように2つの数字で表されます。上の数字は心臓が収縮するときの圧力で、下の数字は弛緩するときの圧力です。. control, physical activity where possible, and dietary patterns that support 血管内皮機能血管の内側を覆う内膜が血管の緊張、炎症、血液凝固を調節する能力。健康な内視細胞は一酸化窒素を放出し、動脈をリラックスさせ、プラーク形成に対する抵抗力を保ちます。..

Mitigating CVD and Dementia Risk

Maintaining vascular health through midlife remains essential to reduce late-life heart failure and cognitive vulnerability. CAC burden and arterial stiffnessArterial stiffness is a measure of how much an artery's wall resists expansion with each pulse of blood; it increases with age as elastin is lost and collagen accumulates, and manifests clinically as a rising systolic blood pressure alongside a falling or stable diastolic blood pressure after about age 60. reflect 累積暴露Cumulative exposure is the total amount of harmful cholesterol particles your arteries have been soaked in across your entire life — how high, multiplied by how long. and risk, and their downstream consequences increasingly implicate brain aging as survival extends [12–17]. Preserving a physiologic mechanical environment—arterial elasticity and microvascular integrity—may reduce endothelial dysfunction and inflammatory amplification, supporting both cardiac and cognitive longevity.

In summary, the transition to longevity is not about doing “more” of the same interventions forever; it is a calculated pivot from growth suppression and maintenance prioritization in midlife to structural preservation and anabolic support in later life. By understanding nutrient sensing (notably leucine thresholds and mTOR dynamics) and the mechanobiology of vascular aging, individuals and clinicians can better navigate the biological hurdles separating standard geriatric aging from resilient centenarian trajectories.

参考文献

1. Johnson SC, Rabinovitch PS, Kaeberlein M. mTOR is a key modulator of ageing and age-related disease. Nature. 2013;493(7432):338-345. doi:10.1038/nature11861
2. Kennedy BK, Lamming DW. The Mechanistic Target of Rapamycin: The Grand ConducTOR of Metabolism and Aging. Cell Metab. 2016;23(6):990-1003. doi:10.1016/j.cmet.2016.05.009
3. Papadopoli D, Boulay K, Kazak L, et al. mTOR as a central regulator of lifespan and aging. F1000Res. 2019;8:F1000 Faculty Rev-998. Published 2019 Jul 2. doi:10.12688/f1000research.17196.1
4. Zarzycka W, Kobak KA, King CJ, Peelor FF 3rd, Miller BF, Chiao YA. Hyperactive mTORC1/4EBP1 signaling dysregulates proteostasis and accelerates cardiac aging. Geroscience. 2025;47(2):1823-1836. doi:10.1007/s11357-024-01368-w
5. Breen L, Phillips SM. Skeletal muscle protein metabolism in the elderly: Interventions to counteract the ‘anabolic resistance’ of ageing. Nutr Metab (Lond). 2011;8:68. Published 2011 Oct 5. doi:10.1186/1743-7075-8-68
6. Bauer J, Biolo G, Cederholm T, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. J Am Med Dir Assoc. 2013;14(8):542-559. doi:10.1016/j.jamda.2013.05.021
7. Moore DR, Churchward-Venne TA, Witard O, et al. Protein ingestion to stimulate myofibrillar protein synthesis requires greater relative protein intakes in healthy older versus younger men. J Gerontol A Biol Sci Med Sci. 2015;70(1):57-62. doi:10.1093/gerona/glu103
8. Wolfson RL, Chantranupong L, Saxton RA, et al. Sestrin2 is a leucine sensor for the mTORC1 pathway. Science. 2016;351(6268):43-48. doi:10.1126/science.aab2674
9. Saxton RA, Knockenhauer KE, Wolfson RL, et al. Structural basis for leucine sensing by the Sestrin2-mTORC1 pathway. Science. 2016;351(6268):53-58. doi:10.1126/science.aad2087
10. Lixandrão ME, Longobardi I, Leitão AE, et al. Daily Leucine Intake Is Positively Associated with Lower Limb Skeletal Muscle Mass and Strength in the Elderly. Nutrients. 2021;13(10):3536. Published 2021 Oct 9. doi:10.3390/nu13103536
11. Szwiega S, Pencharz PB, Rafii M, et al. Dietary leucine requirement of older men and women is higher than current recommendations. Am J Clin Nutr. 2021;113(2):410-419. doi:10.1093/ajcn/nqaa323
12. Bos D, Vernooij MW, Elias-Smale SE, et al. Atherosclerotic calcification relates to cognitive function and to brain changes on magnetic resonance imaging. Alzheimers Dement. 2012;8(5 Suppl):S104-S111. doi:10.1016/j.jalz.2012.01.008
13. Fan Z, Yang C, Qu X, et al. Association of Oxidative Stress on Cognitive Function: A Bidirectional Mendelian Randomisation Study. Mol Neurobiol. 2024;61(12):10551-10560. doi:10.1007/s12035-024-04231-3
14. Huang GS, Hansen SL, McClelland RL, et al. Relation of Progression of Coronary Artery Calcium to Dementia (from the Multi-Ethnic Study of Atherosclerosis). Am J Cardiol. 2022;171:69-74. doi:10.1016/j.amjcard.2022.01.061
15. Iadecola C. The pathobiology of vascular dementia. Neuron. 2013;80(4):844-866. doi:10.1016/j.neuron.2013.10.008
16. Li Q, Qian Z, Huang Y, et al. Mechanisms of endothelial senescence and vascular aging. Biogerontology. 2025;26(4):128. Published 2025 Jun 25. doi:10.1007/s10522-025-10279-y
17. Lai A, Zhou Y, Chheang C, et al. Decoding vascular aging: Substrate stiffness and shear stress orchestrate endothelial inflammation and remodelling via mechanosensitive pathways. Biomaterials. 2026;329:123932. doi:10.1016/j.biomaterials.2025.123932
18. Hirata T, Arai Y, Yuasa S, et al. Associations of cardiovascular biomarkers and plasma albumin with exceptional survival to the highest ages. Nat Commun. 2020;11(1):3820. Published 2020 Jul 30. doi:10.1038/s41467-020-17636-0
19. Levine ME, Suarez JA, Brandhorst S, et al. Low protein intake is associated with a major reduction in IGF-1, cancer, and overall mortality in the 65 and younger but not older population. Cell Metab. 2014;19(3):407-417. doi:10.1016/j.cmet.2014.02.006
20. Kurata H, Meguro S, Abe Y, et al. Dietary protein intake and all-cause mortality: results from The Kawasaki Aging and Wellbeing Project. BMC Geriatr. 2023;23(1):479. Published 2023 Aug 9. doi:10.1186/s12877-023-04173-w
21. Budhathoki S, Sawada N, Iwasaki M, et al. Association of Animal and Plant Protein Intake With All-Cause and Cause-Specific Mortality in a Japanese Cohort. JAMA Intern Med. 2019;179(11):1509-1518. doi:10.1001/jamainternmed.2019.2806
22. Brooks-Wilson AR. Genetics of healthy aging and longevity. Hum Genet. 2013;132(12):1323-1338. doi:10.1007/s00439-013-1342-z
23. Shirakabe A, Ikeda Y, Sciarretta S, Zablocki DK, Sadoshima J. Aging and Autophagy in the Heart. Circ Res. 2016;118(10):1563-1576. doi:10.1161/CIRCRESAHA.116.307474
24. Mannick JB, Del Giudice G, Lattanzi M, et al. mTOR inhibition improves immune function in the elderly. Sci Transl Med. 2014;6(268):268ra179. doi:10.1126/scitranslmed.3009892
25. Marso SP, Daniels GH, Brown-Frandsen K, et al. Liraglutide and Cardiovascular Outcomes in Type 2 Diabetes. N Engl J Med. 2016;375(4):311-322. doi:10.1056/NEJMoa1603827
26. Zinman B, Wanner C, Lachin JM, et al. Empagliflozin, Cardiovascular Outcomes, and Mortality in Type 2 Diabetes. N Engl J Med. 2015;373(22):2117-2128. doi:10.1056/NEJMoa1504720
27. Singh A, D’Amico D, Andreux PA, et al. Urolithin A improves muscle strength, exercise performance, and biomarkers of mitochondrial health in a randomized trial in middle-aged adults. Cell Rep Med. 2022;3(5):100633. doi:10.1016/j.xcrm.2022.100633
28. Zhang Z, Epstein A, Schaefer C, et al. Spatiotemporal profiling reveals the impact of caloric restriction in the aging mammalian brain. Cell Rep. 2025;44(9):116165. doi:10.1016/j.celrep.2025.116165
29. Grummon AH, O’Sullivan K, Petimar J, et al. Nutrition Info and Other Front-of-Package Labels and Simulated Food and Beverage Purchases: A Randomized Clinical Trial. JAMA Netw Open. 2025;8(10):e2537389. Published 2025 Oct 1. doi:10.1001/jamanetworkopen.2025.37389
30. Huang Y, O’Sullivan K, Block JP, Petimar J, Lee CJY, Grummon AH. Impact of the Food and Drug Administration’s Proposed Front-of-Package Label and Alternative Designs on Consumer Understanding: A Randomized Experiment. Am J Prev Med. Published online December 13, 2025. doi:10.1016/j.amepre.2025.108222