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Antigen handling in relation to ageing

J S Garvey, J W Shafer, T J Caperna

Mechanisms of Ageing and Development

|March 1, 1980

Summary

Investigating the distribution of injected 3H-bovine serum albumin (BSA) in rats revealed age-related differences in antigen uptake, particularly in the liver. Older rats showed reduced levels of metabolized antigen associated with liver polysomes, suggesting altered immune responses with aging.

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Area of Science:

Immunology
Aging Research
Biochemistry

Background:

Soluble antigen distribution and metabolism are crucial for understanding immune responses.
Age significantly impacts immunological processes and antigen handling.
Fischer-344 rats are a common model for aging studies.

Purpose of the Study:

To investigate the age-related distribution of a soluble antigen (3H-BSA) in various rat tissues.
To examine the localization and metabolism of 3H-BSA in the liver.
To assess changes in antigen processing at cellular and subcellular levels with aging.

Main Methods:

Intravenous injection of 3H-BSA into Fischer-344 rats of different ages (2 and 24 months).
Tissue sampling and analysis of antigen distribution in blood, liver, spleen, kidneys, lymph nodes, thymus, and lungs.
Isolation and characterization of metabolized antigen products, including liver nucleopeptides and polysome-associated antigen.

Main Results:

Highly vascularized tissues showed age-related antigen distribution patterns similar to blood, with lower percentages at younger and older ages.
Specific localization of antigen was observed in the liver, indicated by higher antigen levels compared to blood.
Metabolized 3H-BSA was found in liver nucleopeptides and co-isolated with liver polysomes, with reduced levels of polysome-associated antigen in older rats.

Conclusions:

Age influences the distribution and localization of soluble antigens in rats.
The liver plays a specific role in antigen localization and metabolism.
Age-related changes in antigen processing at the cellular and subcellular levels, particularly with polysomes, may offer insights into immune responses during aging.

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