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. 1979 Apr;29:17–22. doi: 10.1289/ehp.792917

Effect of age on immune function in terms of chemically induced cancers

Michael Bennett
PMCID: PMC1637372  PMID: 510236

Abstract

Neonatal, fetal, and very old animals are particularly sensitive to chemical carcinogenesis. Reasons for this increased sensitivity could be due to increased susceptibility of “target” organs or cells, peculiar hormonal levels at these age groups, relatively deficient immune functions, or combinations of these and/or other factors. During the late fetal and first three weeks of neonatal life, the immune system is rapidly maturing, is relatively incompetent, and its diverse components are developing at different rates. For example, thymus-dependent (T) alloreactive cells capable of proliferating in mixed lymphocyte reactions (T helper cells) develop by 7 days of age, but precursors of T killer cells are not competent until approximately 14 days of age. Bursa equivalent-dependent (B) cells capable of generating antibody responses are present in fetal liver but are extremely sensitive to tolerance induction until 10-14 days of age when IgD cell surface receptors are detectable. Marrow-dependent (M) cells responsible for regulation of suppressor cells and for natural cytotoxicity to transformed tumor cells do not mature until 3 weeks of age. In very old animals, the thymus is atrophic and cell-mediated immunity is moderately suppressed. Natural cytotoxicity against tumor cells is less than normal but antibody formation (B cell function) is adequate.

Gonadotrophic hormones of the pituitary or placenta are high during pregnancy, the early neonatal period, after the menopause, and in a large fraction of men over 60 years of age. These and other hormones are immunosuppressive and could theoretically facilitate carcinogenesis. The particular immune cell type, if any, responsible for resistance to chemically induced tumors has not been determined. One can only state that susceptibility to chemical carcinogenesis is associated with a relative dysfunction of the immune system and that age is an important factor.

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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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