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Conserved Cellular Senescence Module

Module cellular_senescence 1 disorder Pathograph 8
A conserved pathological module representing cellular senescence (GO:0090398) - a stress-induced, essentially permanent cell-cycle arrest - as a shared driver of age-related tissue dysfunction across organs. Diverse senescence-inducing stresses (replicative/telomeric, oncogenic, genotoxic, oxidative) engage the p16INK4a/Rb and p53/p21 tumor-suppressor programs to arrest the cell; arrested cells acquire a senescence-associated secretory phenotype (SASP) of proinflammatory cytokines, chemokines, and proteases; when immune clearance is outpaced, senescent cells accumulate, and their persistent secretome drives chronic inflammation, loss of regenerative capacity, and progressive tissue dysfunction. This is the conserved core that recurs in osteoarthritis, pulmonary and other organ fibrosis, atherosclerosis, and broader aging biology. Individual disorder entries declare conformance via conforms_to on their pathophysiology nodes, substituting the tissue-specific senescent cell type (e.g. chondrocyte in osteoarthritis, fibroblast in pulmonary fibrosis) while preserving the conserved arrest -> SASP -> accumulation -> dysfunction chain.
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Pathophysiology Nodes

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5 shared nodes are defined in this module.
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Cell Types

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Senescent Fibroblast CL:0000057
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Biological Processes

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DNA Damage Response GO:0006974 INCREASED Cellular Senescence GO:0090398 INCREASED Replicative Senescence GO:0090399 INCREASED Inflammatory Response GO:0006954 INCREASED Cytokine Production GO:0001816 INCREASED Cytokine-Mediated Signaling GO:0019221 INCREASED
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Notes

This is a mechanism module, not a specific disease. Disorder entries reference individual nodes via conforms_to (e.g., "cellular_senescence#Senescent Cell Accumulation"). Conforming nodes should substitute the organ-specific senescent cell type and retain the conserved causal chain. The module is intentionally kept lean: it captures the conserved senescence mechanism and its two canonical biomarkers (p16INK4a and senescence-associated beta-galactosidase) plus the senolytic drug-target pattern, but deliberately does NOT carry disease-specific or context-dependent downstream theories (e.g. the age-contextualized, surface-counterintuitive relationship between accelerated biological aging and early-onset cancer). Such specific, contested, or context-dependent associations belong on the relevant disorder or comorbidity/trajectory entry, which may conforms_to or reference this module rather than embedding the theory here. Worked conformers: Osteoarthritis (senescent chondrocytes; PMID:28436958) and pulmonary fibrosis (senescent fibroblasts; PMID:28230051). Senolytic drug-target pattern: senescence-active treatments use target_mechanisms to link back to the "Senescent Cell Accumulation" node they deplete.
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Used By Disorder Entries

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Hutchinson-Gilford Progeria Syndrome via Cellular senescence → Senescence-Associated Cell Cycle Arrest
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Pathograph

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Pathograph: causal mechanism network for Conserved Cellular Senescence Module Interactive directed graph showing how this shared module's pathophysiology nodes connect.
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Pathophysiology

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Senescence-Inducing Stress
trigger
A diverse set of cellular stresses initiates the senescence program: telomere attrition from repeated division (replicative senescence), activated oncogenes (oncogene-induced senescence), severe or irreparable DNA damage and chromatin disruption (genotoxic stress), oxidative and mitochondrial stress, and therapy-induced damage. Regardless of the specific insult, these converge once the cell senses a critical level of damage or dysfunction.
DNA Damage Response GO:0006974 INCREASED
Downstream
  • Senescence-Associated Cell Cycle Arrest
Senescence-Associated Cell Cycle Arrest
central effector
Sensing of critical damage engages the major tumor-suppressor pathways - p16INK4a/Rb and p53/p21 - to impose an essentially permanent cell-cycle arrest. This arrest is the defining feature of senescence and is initially protective, preventing propagation of damage and malignant transformation of cells at risk. Elevated p16INK4a (CDKN2A) is the canonical molecular marker of this state.
Cellular Senescence GO:0090398 INCREASED Replicative Senescence GO:0090399 INCREASED
Used by disorders
Hutchinson-Gilford Progeria Syndrome as Cellular senescence
Downstream
  • Senescence-Associated Secretory Phenotype
  • Senescent Cell Accumulation
Senescence-Associated Secretory Phenotype
amplifier
Arrested senescent cells acquire a senescence-associated secretory phenotype (SASP): secretion of proinflammatory cytokines (e.g. IL-6, IL-8), chemokines, growth factors, and matrix-remodeling proteases. The SASP converts senescent cells into proinflammatory, tissue-remodeling cells and is the principal means by which a non-dividing cell exerts paracrine effects on its microenvironment, reinforcing senescence and recruiting immune cells.
Senescent Fibroblast CL:0000057
Inflammatory Response GO:0006954 INCREASED Cytokine Production GO:0001816 INCREASED Cytokine-Mediated Signaling GO:0019221 INCREASED
Downstream
  • Senescent Cell Accumulation
  • Tissue Dysfunction and Age-Related Pathology
Senescent Cell Accumulation
effector
In young tissue, senescence is transient: senescent cells are cleared by the immune system and replaced through regeneration. In aged or pathological tissue this clearance is outpaced, so senescent cells accumulate. The accumulated burden, sustained by the SASP and impaired immune surveillance, is the rate-limiting reservoir that selective elimination (senolysis) targets.
Cellular Senescence GO:0090398 INCREASED
Downstream
  • Tissue Dysfunction and Age-Related Pathology