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Immunological functions of aged human monocytes
J A McLachlan1, C D Serkin, K M Morrey-Clark
1Department of Molecular Pharmacology and Biological Chemistry, Northwestern University Medical School, Chicago, IL 60611, USA.
Summary
Aging impairs monocyte immune function, leading to increased infection and cancer risk. Aged monocytes show reduced tumor cell killing and inflammatory responses, characteristic of immunosenescence.
Area of Science:
- Immunology
- Gerontology
- Cell Biology
Background:
- Aging is linked to higher rates of infection and cancer.
- Age-related immune deficiencies are known as immunosenescence.
- Monocytes play a crucial role in immune responses.
Purpose of the Study:
- To investigate the impact of aging on human monocyte function.
- To compare the activation of aged monocytes versus young monocytes.
Main Methods:
- Human monocytes were isolated from young (approx. 25 years) and aged (>= 65 years) individuals.
- Monocyte activation was assessed using lipopolysaccharide (LPS).
- Key functional parameters including cytotoxicity, cytokine secretion, and intermediate release were measured.
Main Results:
- Aged monocytes exhibited decreased cytotoxicity against tumor cells in vitro.
- Interleukin-1 (IL-1) secretion was reduced in aged monocytes, but precursor production remained unchanged.
- Reactive oxygen and nitrogen intermediate (ROI/RNI) release was diminished in aged monocytes.
- Increased intracellular cyclic adenosine monophosphate (cAMP) levels and loss of protein kinase translocation were observed in aged monocytes.
Conclusions:
- Aged monocytes display distinct characteristics of immunosenescence.
- These functional deficits in aged monocytes may contribute to increased susceptibility to infections and cancer in the elderly.
- Understanding these age-related changes is crucial for developing interventions to bolster immune function in older adults.