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Related Concept Videos

Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Mitochondria01:37

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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
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Related Experiment Video

Updated: Feb 19, 2026

Drug-Induced Senescence in Liver Cells Promotes M2 Macrophage Polarization: Implications for Tyrosine Kinase Inhibitor-Associated Hepatotoxicity
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Macrophage Senescence: Friend or Foe?

Xunxi Deng1, Zhiyi Yin1, Shi Tai2

  • 1Department of Blood Transfusion, The Second Xiangya Hospital of Central South University, Changsha, China.

Aging and Disease
|February 17, 2026
PubMed
Summary
This summary is machine-generated.

Cellular senescence in macrophages, termed immunosenescence, contributes to aging and age-related diseases by promoting inflammation and impairing function. Targeting senescent macrophages offers potential therapeutic strategies for combating aging.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Aging Research

Background:

  • Macrophages are crucial for immunity, repair, and homeostasis.
  • Cellular senescence in macrophages (immunosenescence) occurs due to aging, stress, and inflammation.
  • Senescent macrophages display a pro-inflammatory phenotype (SASP), reduced phagocytosis, and metabolic issues.

Purpose of the Study:

  • To review molecular mechanisms driving macrophage senescence.
  • To discuss the dual roles of senescent macrophages in health and disease.
  • To explore therapeutic interventions targeting senescent macrophages.

Main Methods:

  • Literature review synthesizing current research on macrophage senescence.
  • Analysis of molecular pathways involved in senescence.
  • Discussion of clinical implications and therapeutic strategies.

Main Results:

  • Macrophage senescence is driven by DNA damage, mitochondrial dysfunction, epigenetic changes, and cGAS-STING activation.
  • Senescent macrophages have context-dependent effects, aiding acute repair but promoting chronic inflammation and age-related diseases.
  • Interventions like senolytics and metabolic rejuvenation show therapeutic promise.

Conclusions:

  • Macrophage senescence is a key factor in aging and associated pathologies.
  • Targeting senescent macrophages presents a promising therapeutic avenue.
  • Further research is needed to optimize interventions for aging and disease.