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. 1989 Feb;75(2):286–291.

Effect of age on the human high affinity interleukin 2 receptor of phytohaemagglutinin stimulated peripheral blood lymphocytes.

J E Nagel 1, R K Chopra 1, D C Powers 1, W H Adler 1
PMCID: PMC1542135  PMID: 2784739

Abstract

High affinity interleukin 2 receptors (HA-IL-2R) on mitogen- or antigen-stimulated T cells have been shown to efficiently bind interleukin 2 (IL-2) and to transduce the activation signal(s) that facilitate proliferation. This study was initiated to determine whether the impaired proliferative response of T cells from elderly individuals can be attributed to the defective expression of HA-IL-2R. While cells from both young and old individuals had statistically insignificant differences in the number of HA-IL-2R per membrane IL-2R-positive cell and these receptors displayed similar binding affinities with 125I-IL-2, there were consistently fewer cells and fewer cells expressing HA-IL-2R in the cell cultures from elderly individuals. The magnitude of the age-associated impairment in cell proliferation was decreased, but remained present, when Percoll fractionated lymphoblasts, as compared to peripheral blood lymphocytes (PBL), were cultured in the presence of exogenous interleukin 2 (IL-2). The results demonstrate that a significantly larger percentage of lymphocytes from elderly individuals do not respond to mitogenic stimulation and, probably due to stimulus stress, die in culture. As a consequence there are fewer functionally competent cells expressing the HA-IL-2R in cultures from elderly individuals, which in turn contributes to the age-related defect in the lymphocyte proliferative response.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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