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Visualizing the DNA Damage Response in Purkinje Cells Using Cerebellar Organotypic Cultures
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Chronic inflammation and aging: DNA damage tips the balance.
Mary M Cavanagh1, Cornelia M Weyand, Jörg J Goronzy
1Department of Medicine, Stanford University, Stanford, CA 94305, United States.
Current Opinion in Immunology
|May 9, 2012
Summary
Aging immune systems become overly inflammatory, leading to tissue damage rather than improved immunity. This review explores how DNA damage and altered lymphocyte activation in aged immunity drive chronic inflammation.
Area of Science:
- Immunology
- Aging Biology
- Inflammation Research
Background:
- The aged immune system exhibits a dual state: hyporesponsiveness to pathogens and hyperresponsiveness to inflammation.
- Chronic inflammation is intrinsically linked with the aging process, creating a detrimental feedback loop.
Purpose of the Study:
- To review mechanisms driving amplified inflammation in aged adaptive immunity.
- To examine the relationship between chronic inflammation and immune aging.
Main Methods:
- Review of current research on immune aging and inflammation.
- Analysis of cellular and molecular mechanisms involved in immune dysregulation.
Main Results:
- Accumulated DNA damage in hematopoietic stem cells depletes stem cell pools and increases damaged effector cells.
- Chronic DNA damage responses and cellular senescence in lymphocytes and other cells promote inflammatory mediator production.
- Aged lymphocytes show increased activation via innate receptors and reduced antigen specificity, exacerbated by inflammatory signals.
Conclusions:
- Inflammatory bias in aged immunity leads to tissue destruction without enhancing protective immunity.
- Understanding these mechanisms is crucial for addressing age-related inflammatory diseases.
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