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Pillar 4: Cellular Stress & Inflammaging | Longevity Protocol
The Vitality Longevity Protocol
The Longevity Protocol · Pillar Four
Pillar Four of Five

Cellular Stress &Inflammaging

Chronic low-grade inflammation — "inflammaging" — is one of the most consistently documented features of biological ageing. Senescent cells, oxidative stress, NF-κB signalling and the compounds studied in published research.

11 min read 9 studies cited Not health claims
The Fundamentals

What is inflammaging?

Inflammaging — a portmanteau of "inflammation" and "ageing" coined in published research — describes the chronic, low-grade, sterile inflammation that has been consistently documented as a feature of biological ageing. Unlike acute inflammation — which is a short-term, targeted protective response to injury or infection — inflammaging is a persistent background state of inflammatory signalling that accumulates with age and does not resolve.

Inflammaging has been documented across multiple human tissue types and in blood markers in aged individuals in peer-reviewed research. Elevated levels of pro-inflammatory cytokines — including IL-6, TNF-α, IL-1β and C-reactive protein (CRP) — are consistently found in aged tissue and blood samples compared to younger samples in published research.

It is distinguished from beneficial acute inflammation by its chronic, unresolved and low-grade nature. Where acute inflammation is protective and self-limiting, inflammaging persists without resolution — driven by accumulating cellular damage, senescent cells and dysregulated immune signalling.

Important: This describes what published research has documented about inflammation and ageing as biological processes — not a claim about any food supplement product. All Vitality Supplements products are food supplements not intended to diagnose, treat, cure or prevent any disease.

Inflammaging is not acute inflammation. It is a chronic, unresolved background state that accumulates over decades — and has been consistently documented as a hallmark of biological ageing.
1989
AHCC research beginsJapan — most studied mushroom extract
SASP
Senescence secretomePrimary driver of inflammaging
NF-κB
Primary transcription factorDriving inflammaging
IL-6
Key cytokineElevated in aged tissue samples
Senescent cells (SASP)
Cells that have permanently stopped dividing but remain metabolically active, secreting a cocktail of pro-inflammatory cytokines and growth factors. The senescence-associated secretory phenotype (SASP) is one of the primary drivers of inflammaging — accumulating senescent cells drive chronic inflammatory signalling in surrounding tissue.
Primary driver
Mitochondrial ROS
Dysfunctional mitochondria produce excess reactive oxygen species (ROS) — oxidative stress that damages cellular components and activates inflammatory signalling pathways. The connection between mitochondrial dysfunction (Pillar 3) and inflammaging creates a vicious cycle where cellular stress drives inflammation which drives further cellular stress.
Cross-pillar link
Damaged DNA (DAMPs)
DNA damage accumulates with age — from oxidative stress, replication errors and mitochondrial dysfunction. Damaged DNA fragments activate damage-associated molecular patterns (DAMPs) that trigger innate immune responses and inflammatory signalling, even in the absence of infection.
Damage accumulation
Dysregulated immune function
Immune cell function changes with age — a process called immunosenescence. Aged immune cells become less effective at resolving inflammation while remaining or becoming more prone to generating inflammatory signals. The balance between pro- and anti-inflammatory signalling becomes dysregulated.
Immunosenescence
Cellular Senescence

Senescent cells & the SASP

Cellular senescence is the permanent arrest of cell division — a state cells enter when they have exhausted their replicative capacity (the Hayflick limit) or been triggered by stress signals including DNA damage, oxidative stress or oncogenic activation. Senescence is a protective mechanism that prevents damaged cells from proliferating.

The problem is what happens next. Rather than dying, senescent cells remain metabolically active and secretory. They produce and release a complex mixture of pro-inflammatory cytokines, growth factors, proteases and matrix metalloproteinases — collectively called the Senescence-Associated Secretory Phenotype (SASP).

The SASP has local and systemic effects. Locally, it damages surrounding tissue and can trigger senescence in neighbouring cells — a phenomenon called paracrine senescence. Systemically, circulating SASP factors contribute to the low-grade inflammatory background documented in aged organisms. The accumulation of senescent cells with age — and their increasingly active SASP — is considered a primary driver of inflammaging.

Senescent Cell — SASP Output
Senescent Cell
IL-6, IL-8Pro-inflammatory cytokines — primary SASP components documented in published research
TNF-αTumour necrosis factor — drives systemic inflammatory signalling
MMPsMatrix metalloproteinases — degrade extracellular matrix, impair tissue structure
Growth factorsIncluding VEGF — can disrupt tissue homeostasis and neighbouring cell behaviour
Senescent cells accumulate with age and secrete a cocktail of inflammatory signals — the SASP. This accumulation is one of the most reproducible features of biological ageing.
Oxidative Stress

Reactive oxygen species & cellular damage

Reactive oxygen species (ROS) are chemically reactive molecules — including superoxide, hydrogen peroxide and hydroxyl radicals — produced as normal byproducts of cellular metabolism, particularly mitochondrial energy production. In controlled amounts, ROS serve important signalling functions. When they exceed the cell's antioxidant capacity, they cause oxidative stress — damaging DNA, proteins and lipids.

Published research has documented that oxidative stress increases with age — driven by declining antioxidant defences, increasing mitochondrial dysfunction and accumulating DNA damage. This increase in oxidative stress drives inflammation, activates the NF-κB pathway and contributes to the cellular damage that characterises biological ageing.

The connection to Pillar 3 is direct: dysfunctional mitochondria produce more ROS, which drives more oxidative stress, which activates more inflammatory signalling. This cross-pillar interaction is one reason mitochondrial health and inflammaging are considered closely connected in longevity biology research.

ROS are a normal metabolic byproduct — the problem is when they exceed antioxidant capacity. This imbalance grows with age as mitochondrial function declines and antioxidant defences weaken.
Superoxide dismutase (SOD)
The primary mitochondrial antioxidant enzyme — MnSOD — is regulated by SIRT3 (covered in Pillar 3). Its activity declines with age, impairing the cell's ability to neutralise mitochondrial ROS. This is another cross-pillar connection between NAD+, SIRT3 and oxidative stress management.
DNA oxidative damage
ROS attack DNA directly — producing oxidised bases, strand breaks and cross-links. 8-hydroxy-2'-deoxyguanosine (8-OHdG) is a commonly used biomarker of oxidative DNA damage. Its levels are consistently elevated in aged tissue samples in published research. Oxidative DNA damage activates PARP enzymes — consuming NAD+ (Pillar 1).
The Inflammatory Pathway

NF-κB — the inflammaging switch

NF-κB (Nuclear Factor kappa-light-chain-enhancer of activated B cells) is a transcription factor family that regulates the expression of over 150 genes involved in inflammation, immune response, cell survival and stress responses. It is considered one of the primary molecular drivers of inflammaging.

Published research has documented that NF-κB activity increases with age across multiple cell types and tissue types. Elevated NF-κB drives the sustained production of pro-inflammatory cytokines — including IL-6, TNF-α and IL-1β — that characterise the inflammaging phenotype.

NF-κB is activated by multiple stress signals that accumulate with age: oxidative stress, DNA damage, SASP cytokines and mitochondrial dysfunction. This means the drivers of inflammaging covered in this pillar — senescent cells, ROS, damaged DNA — all converge on NF-κB as a common downstream effector.

The connection to NAD+ and sirtuins is also direct: published research has documented that SIRT1 deacetylates and inhibits NF-κB — creating a mechanistic link between NAD+ levels, sirtuin activity and NF-κB-driven inflammatory signalling. As NAD+ falls and SIRT1 activity is constrained, NF-κB inhibition is reduced — contributing to age-related increases in inflammatory signalling.

NF-κB activated by
Oxidative stress · DNA damage · SASP cytokines · Mitochondrial ROS · Pathogen signals. Multiple ageing-associated stressors converge on NF-κB — making it a central hub of inflammaging biology.
NF-κB drives production of
IL-6 · TNF-α · IL-1β · Cyclooxygenase-2 (COX-2) · Inducible nitric oxide synthase (iNOS). All consistently elevated in aged tissue in published research.
SIRT1 inhibits NF-κB
Published research has documented that SIRT1 deacetylates the p65 subunit of NF-κB, inhibiting its transcriptional activity. This creates the NAD+ → SIRT1 → NF-κB inhibition pathway — connecting NAD+ metabolism (Pillar 1) to inflammaging (Pillar 4).
Polyphenols and NF-κB
Resveratrol and pterostilbene have been studied in relation to NF-κB signalling in published research — both via SIRT1 activation and direct effects. This is an additional research rationale for sirtuin-pathway polyphenols discussed in Pillar 2.
The Pillar 4 Ingredient

AHCC — 35 years of research

AHCC (Active Hexose Correlated Compound) is a standardised extract of cultured Lentinula edodes mycelia — a mushroom-derived ingredient with one of the most extensive published research bases of any supplement ingredient in the cellular biology and immune research context. Research began in Japan in 1989. AHCC is the Vitality Supplements ingredient most directly studied in the context of cellular stress and immune cell biology.

Vitality Supplements · Immunity Series
AHCC 1000mg
Active Hexose Correlated Compound — Standardised Mushroom Extract
Source
Cultured Lentinula edodes mycelia — standardised extract, not whole mushroom powder
Research origin
1989 — Japan. One of the most studied mushroom-derived supplement ingredients in published literature
Research context
Published research has explored AHCC in the context of immune cell biology, natural killer (NK) cell activity, dendritic cell function and cellular stress responses
Key published finding
Multiple peer-reviewed studies have explored AHCC's relationship with immune cell markers. Research has been conducted in human subjects across multiple conditions and populations
Serving size
1000mg per serving — the dose used in published human research
Regulatory status
Food supplement ingredient — no authorised health claims under UK food supplement regulations
Vitality testing
ISO/IEC 17025-accredited laboratory · Every production batch · UK manufactured
Shop AHCC 1000mg →

Important: The above describes AHCC as a food supplement ingredient and summarises the published research context accurately. This is not a health claim. AHCC is a food supplement — it is not intended to diagnose, treat, cure or prevent any disease or medical condition.

Published Research

Key cellular stress research

Hallmarks of Ageing 2013
Chronic inflammation as a hallmark of ageing
The landmark 2013 "Hallmarks of Ageing" paper identified chronic inflammation and cellular senescence as separate hallmarks of biological ageing. The inflammaging phenotype — persistent elevated pro-inflammatory signalling — was proposed as a unifying mechanism connecting multiple hallmarks.
Mechanistic Research
SIRT1 deacetylates and inhibits NF-κB
Published mechanistic research documented that SIRT1 inhibits NF-κB transcriptional activity through deacetylation of the p65 subunit. This creates the mechanistic link between NAD+ availability, SIRT1 activity and inflammaging — connecting all four pillars of this protocol.
Human Research
SASP and ageing — documented in human tissue
Multiple peer-reviewed studies have documented elevated SASP markers in aged human tissue and blood. IL-6, TNF-α and IL-1β are consistently elevated in aged individuals compared to younger cohorts in published human research — confirming the inflammaging phenotype in humans.
Human Research
AHCC and immune cell markers — published human studies
Multiple peer-reviewed human studies have explored AHCC's relationship with immune cell markers including natural killer cell activity and dendritic cell counts. Published research spans over 30 years and has been conducted across multiple populations and research contexts. As a food supplement, AHCC has no authorised health claims under UK regulations.
FAQ

Common questions

Inflammaging is the chronic, low-grade, sterile inflammation documented as a feature of biological ageing. Unlike acute inflammation — which is protective and self-limiting — inflammaging persists without resolution. It is driven by accumulating senescent cells (SASP), mitochondrial ROS, DNA damage signals and dysregulated NF-κB signalling. Published research has identified it as one of the hallmarks of biological ageing.
Senescent cells have permanently stopped dividing but remain metabolically active. They secrete a cocktail of pro-inflammatory cytokines, growth factors and matrix metalloproteinases — the SASP (Senescence-Associated Secretory Phenotype). SASP drives local inflammation, can trigger senescence in neighbouring cells and contributes to systemic inflammaging. Senescent cells accumulate with age, making the SASP an increasingly significant driver of chronic inflammation.
The connection is via SIRT1 and NF-κB. Published research has documented that SIRT1 — an NAD+-dependent enzyme — inhibits NF-κB by deacetylating its p65 subunit. As NAD+ declines with age, SIRT1 activity is reduced, NF-κB inhibition decreases and pro-inflammatory signalling increases. This creates a direct mechanistic pathway from NAD+ decline to inflammaging. Read Pillar 1: NAD+ →
NF-κB is a transcription factor that regulates inflammatory gene expression. Published research has documented that NF-κB activity increases with age and drives sustained production of IL-6, TNF-α and IL-1β — the primary cytokines of the inflammaging phenotype. Multiple ageing-associated stressors activate NF-κB: oxidative stress, DNA damage, SASP cytokines and mitochondrial dysfunction. SIRT1 (NAD+-dependent) inhibits NF-κB — creating the cross-pillar connection.
AHCC is a standardised extract of cultured Lentinula edodes mycelia. Research began in Japan in 1989 and has continued for over 35 years. Published human research has explored AHCC's relationship with immune cell markers including natural killer cell activity and dendritic cell function. It is one of the most extensively researched mushroom-derived supplement ingredients in published literature. As a food supplement, it has no authorised health claims under UK regulations. View AHCC 1000mg →

Shop the cellular stress range

AHCC 1000mg — 35 years of published research. UK manufactured. Every batch independently tested by ISO/IEC 17025-accredited laboratory.

Shop AHCC 1000mg → View full range
Pillar 3: Mitochondrial Health Pillar 5: The Supplement Protocol
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This page is part of The Vitality Longevity Protocol — an educational resource covering published peer-reviewed research. Not medical advice. All Vitality Supplements products are food supplements regulated under UK food supplement legislation — not medicines. Not intended to diagnose, treat, cure or prevent any disease. Consult a qualified healthcare professional before starting any supplement. Contact: info@vitality-supplements.co.uk