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. 2021 Jun 28;18(6):462–478. doi: 10.11909/j.issn.1671-5411.2021.06.004

Table 2. Age-related sources of inflammation.

The body, organs, tissue level The cell level The subcellular level
Visceral obesity (secretion of inflammatory cytokines, chemokines, adipokines) Activation of the innate immune cells by pathogen-associated molecular patterns and damage-associated molecular patterns Posttranslational alterations (at the level of micro-RNA)
Latent infections (cytomegalovirus, helicobacter pylori) Cell senescence (a senescence-associated secretory phenotype: intracellular signaling loops and inflammatory cascade involving the nuclear factor kappa-B, IL-1α, transforming growth factor-betta and IL-6 pathway) Mitochondrial dysfunction (oxydative-stress mediated inflammation via activation of nod-like receptor 3 inflammasome)
Depression, chronic stress (via activation of the hypothalamus-hypophysis-adrenal stress axis) Cell apoptosis-transformation into necrotic cells Impaired autophagy (impaired clearance of apoptotic cells)
Comorbidities (tissue infiltration with inflammatory cells, paracrine cell activation) Cell surfice receptors density and activation alterations Transcription factors activation in inflammatory response pathways (nuclear factor kappa-B, activation protein-1)
Neuro-endocrine alterations Dysregulation of paroxisome proliferator activated receptors (nuclear hormone receptors activated by fatty acids and oic osano ides)
Renal function decline Dysregulation of pro-resolving lipid mediators (lipoxins, resolvins, maresins)
Altered permeability of the gastro-intestinal system M1 (pro-inflammatory) type macrophages
Alterations in gut microbiome Insufficient inflammation resolution
Genetic predisposition An imbalance between pro-inflammatory TNF-α, IL-6, IL-18, IL-1 cytokine family (IL-1α, IL-1β, IL-18, IL-33, IL-36α, IL-36β, and IL-36γ), IL-17A, IL-22, and anti-inflammatory cytokines IL-10, IL-37, transforming growth factor-betta, sTNFR, sIL-1R