Aging impairs membrane potential responsiveness as well as opening of voltage and ligand gated Na+ channels in human lymphocytes

C. Pieri, F. Moroni, R. Recchioni, F. Marcheselli, M. Falasca, R. Antonicelli, S. Damjanovich

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Depolarizing effects of increasing concentrations of extracellular K+, as well as the repolarizing effect of bretylium tosylate (BT) were evaluated in human lymphocytes from young and elderly volunteers. Cells from elderly volunteers were less responsive to depolarization induced by increased extracellular potassium concentrations than those from young volunteers. Upon a near complete depolarization induced by 140 mM K+ in the extracellular space, a significant amount of non-responding cells were found in samples from elderly volunteers. BT, which opens the otherwise silent Na+ channels of partially depolarized cells, with subsequent activation of the Na+-K+ pump (Pieri et al., 1989). repolarized both young and old lymphocytes. However, the degree of the repolarization was only 40% in the case of lymphocytes from elderly volunteers than from that of the young. It is suggested that an increase of membrane microviscosity, characteristic of old cells, may be at least partially responsible for the decreased responsiveness of plasma membrane functions which were observed.

Original languageEnglish
Pages (from-to)145-154
Number of pages10
JournalArchives of Gerontology and Geriatrics
Volume14
Issue number2
DOIs
Publication statusPublished - 1992

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Ligand-Gated Ion Channels
Membrane Potentials
Volunteers
Lymphocytes
Bretylium Tosylate
activation
Extracellular Space
Potassium
Cell Membrane
Membranes

Keywords

  • Aging
  • Human lymphocytes
  • Membrane potential
  • Na channels

ASJC Scopus subject areas

  • Ageing
  • Medicine(all)

Cite this

Aging impairs membrane potential responsiveness as well as opening of voltage and ligand gated Na+ channels in human lymphocytes. / Pieri, C.; Moroni, F.; Recchioni, R.; Marcheselli, F.; Falasca, M.; Antonicelli, R.; Damjanovich, S.

In: Archives of Gerontology and Geriatrics, Vol. 14, No. 2, 1992, p. 145-154.

Research output: Contribution to journalArticle

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AU - Moroni, F.

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AU - Marcheselli, F.

AU - Falasca, M.

AU - Antonicelli, R.

AU - Damjanovich, S.

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