Cell surface markers, inositol phosphate levels and membrane potential of lymphocytes from young and old human patients

Zs Varga, N. Bressani, A. M. Zaid, L. Bene, T. Fülöp, A. Leövey, N. Fabris, S. Damjanovich

Research output: Article

28 Citations (Scopus)

Abstract

It is well known that most physiological functions change with aging, including the immune response. Data concerning the aging of lymphocyte subpopulations are conflicting. The antigen density of peripheral blood lymphocytes has been determined by flourescently tagged OKT-3, OKT-4, OKT-8, OKT-11 and OKM1 monoclonal antibodies in a carefully selected aged (over 87 years) population, and compared to that of young subjects. A substantial difference was found in the percentage distribution of OKT8 and OKM1 subsets. The volume of lymphocytes of the elderly population was significantly less that that of the young. The effect of various monoclonal antibodies on phosphatidylinositol breakdown has also been studied. It was found that only OKT3, acting through the CD3 antigen receptor was able to induce inositol phosphate formation in both young and eldery, although in the latter population this occured at a lower level. Because the plasma membrane plays a regulatory role in this process, an important and sensitive functional parameter, the membrane potential, was also monitored and influenced by changing the extracellular K+ concentration. The lymphocytes of the elderly population responded less sensitively to changes in extracellular potassium concentration.

Original languageEnglish
Pages (from-to)275-280
Number of pages6
JournalImmunology letters
Volume23
Issue number4
DOIs
Publication statusPublished - febr. 1990

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology

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