Abstract
Monoclonal antibodies of the OKT series were used to identify T lymphocytes (OKT3+) and their inducer (OKT4+) and suppressor-cytotoxic (OKT8+) subsets in the peripheral blood mononuclear cells (PBMC) of 32 healthy old-aged people more than 70 years old (16 men and 16 women) compared to 47 adults (29 men, 18 women) less than 40 years old. The absolute lymphocyte count in the peripheral blood was not significantly influenced by age or sex. Both the proportions and the absolute numbers of T3+ and T4+ cells were significantly lower in aged than in young participants. The proportions but not the absolute counts of OKT8+ cells were higher in the elderly. Most interesting is the influence of sex and these parameters. Old women have normal numbers and proportions of T3+, T4+ and T8+ cells when compared to young women. The latter have a significantly higher proportion of T8+ cells than young adult males. Old men have a striking reduction of both the numbers and proportions of OKT3+ and OKT4+ cells when compared with young men and with women. In addition, old men have an elevated proportion, but a normal absolute number, of OKT8+ cells. The responses of PBMC to phytohaemagglutinin extent (PHA), concanavalin A (Con A) and pokeweed mitogen (PWM) are reduced to the same extent in ageing male and female subjects when compared to young adults. In the older group, the magnitude of the lymphocyte response to PHA and Con A but not to PWM is negatively correlated with the proportions of OKT8+ cells. Surprisingly, these correlations are observed only in old women but not in old men. The latter finding excludes the possibility that the age-associated decline of the lymphocyte response to T cell mitogens is secondary to an imbalance between T4+ and T8+ lymphocytes.
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Selected References
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