Journal September 26, 2026 4 min read

How is cellular senescence measured?

Cellular senescence is measured by combining markers of irreversible cell-cycle arrest, DNA damage signalling, and the senescence-associated secretory phenotype across in vitro, animal, and human tissue models.

peptides-pro Editorial

Cellular senescence is a stress response defined by irreversible cell-cycle arrest coupled to a pro-inflammatory secretory programme, and it is measured by combining several marker classes rather than by any single assay. The senescence-associated secretory phenotype (SASP) comprises inflammatory cytokines, chemokines, growth factors, and matrix-remodelling enzymes that regulate the tumour microenvironment [4]. Because senescence is heterogeneous across organs and is triggered by age-associated insults, measurement strategies typically pair arrest markers with DNA damage readouts and secreted-factor profiling [1].

The work described in the evidence centres on DNA damage response signalling through the ATM kinase pathway, with lysine-specific demethylase 1 (LSD1) acting as a regulator of ATM methylation status [1].

Research Studies

LSD1 and ATM demethylation in aged organs and senescent cells

LSD1 was reported to be upregulated in aged organs and in senescent cells. In response to natural aging or ionizing radiation-induced DNA damage, LSD1 interacted with and demethylated ATM at lysine 3,016, as confirmed using a newly generated ATM-K3016me antibody. This modification sustained ATM phosphorylation, amplified DNA damage signalling, and promoted senescence and organ aging [1]. The findings position ATM-K3016me detection as a measurable modification tied to senescence status in the models studied.

SASP and tumour microenvironment remodelling

A review of SASP-mediated remodelling describes how senescent cells influence cancer progression through irreversible cell-cycle arrest, immune surveillance, and paracrine signalling. SASP induction mechanisms, condition-dependent roles in cancer, and emerging strategies targeting senescent cells and SASP signalling were synthesised from literature identified through PubMed, Scopus, Web of Science, and Google Scholar searches [4].

Bone aging as a multiscale degenerative phenomenon

Bone aging is characterised as a multi-level, networked degenerative process spanning molecular, cellular, tissue, and system levels, rather than simple bone mass loss. At the macroscopic level it is marked by declines in bone mass, microstructure, and biomechanical properties [2]. Measurement across these levels requires distinct readouts at each scale.

ETS1/DRP1 axis and nucleus pulposus cell senescence

In human nucleus pulposus cells (NPCs), ETS proto-oncogene 1 (ETS1) was identified as a regulator of mitochondrial fission. ETS1 was upregulated in severe human intervertebral disc degeneration and correlated with degeneration severity and NPC senescence. Inflammatory cytokines induced ETS1 upregulation, which directly bound to the dynamin 1-like (DNM1L, encoding DRP1) promoter [7].

Nebivolol and TGF-β1-dependent endothelial senescence

Serum from patients with hypertension was applied to endothelial cells in vitro to assess angiogenic activity, cellular senescence, mitochondrial metabolism, and oxidative stress. Seventy-one patients with newly diagnosed hypertension were randomly assigned to amlodipine, nebivolol, or perindopril, with serum collected before and six weeks after treatment [8].

Ergothioneine and OCTN1-dependent tissue distribution

Ergothioneine (EGT) is a diet-derived sulfur-containing histidine derivative with antioxidant, anti-inflammatory, and cytoprotective properties. In humans, its absorption, tissue distribution, and long-term retention are mainly mediated by the organic cation transporter OCTN1, which may help explain its accumulation in metabolically active and stress-prone tissues. Links to age-related disorders have been proposed, although therapeutic value still requires confirmation in larger and longer-term clinical studies [3].

PQQ and mitochondrial function in skin aging models

Pyrroloquinoline quinone (PQQ) is a redox-active ortho-quinone that can participate in repeated redox cycling, protect mitochondrial function, and activate signalling associated with mitochondrial biogenesis. Mitochondrial dysfunction is recognised as a contributor to intrinsic skin aging, photoaging, cellular senescence, impaired extracellular-matrix homeostasis, dysregulated pigmentation, and delayed recovery after energy-based or minimally invasive procedures [5].

SIRT1, oxidative stress, and neurocardiac cognitive loss

Cardiovascular disease and cognitive loss have been described as sharing a neurocardiac basis, with poor vascular perfusion impairing cognitive function in both Alzheimer's disease and multiple sclerosis. Current treatments for cognitive impairment in these conditions often fail to fully address shared underlying cellular mechanisms [6].

Comparison of senescence marker classes

Marker class	Example readout	Model context in evidence
DNA damage signalling	ATM-K3016me, ATM phosphorylation	Aged organs, senescent cells, ionizing radiation [1]
Secretory phenotype	SASP cytokines, chemokines, growth factors	Tumour microenvironment [4]
Mitochondrial dynamics	ETS1, DRP1/DNM1L	Human nucleus pulposus cells [7]
Endothelial function	Angiogenic activity, oxidative stress	Patient serum applied to endothelial cells in vitro [8]

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