Effect of age on lymphocyte proliferation

¹Department of Haematology, Flinders Medical Centre, Bedford Park, South Australia.

|December 1, 1987

Summary

Lymphocyte proliferative capacity declines with age, but rare cells with extended potential persist. Monoclonality development in cultures impacts interpretation of results, highlighting the need to consider cell heterogeneity.

Area of Science:

Immunology
Cell Biology
Gerontology

Background:

Lymphocyte proliferative capacity is crucial for immune function.
Cellular senescence and the Hayflick limit are key concepts in aging research.
Understanding age-related changes in immune cells is vital for public health.

Purpose of the Study:

To investigate the relationship between chronological age and lymphocyte proliferative capacity.
To explore the heterogeneity of proliferative potential within lymphocyte populations.
To examine the impact of monoclonality on interpreting lymphocyte culture results.

Main Methods:

Lymphocytes were isolated from neonates, young adults (20-30 years), and elderly individuals (70-90 years).
Mass cultures and individual clone cultures were established to assess expansion.
Cytogenetic and molecular analyses were performed to detect monoclonality.

Main Results:

Mass lymphocyte cultures exhibited a Hayflick effect but showed no age-related difference in final expansion magnitude.
Monoclonality developed in all mass cultures.
Individual clone expansion varied, with lower magnitudes than mass cultures, and was age-related.
Rare cells with extended proliferative potential were found in elderly individuals.

Conclusions:

Lymphocytes possess heterogeneous proliferative potential.
Overall lymphocyte proliferative capacity decreases with age.
Rare long-lived lymphocyte clones persist into old age.
Monoclonality in cultures necessitates careful interpretation of results, considering the properties of rare high-proliferative cells.

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Effect of age on lymphocyte proliferation

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Background:

Purpose of the Study:

Main Methods:

Main Results:

Conclusions:

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