Decreased NA+, k+-ATPase activity in erythrocyte membrane from rheumatoid arthritis patients

I. Testa, R. A. Rabini, A. Corvetta, G. Danieli

Research output: Contribution to journalArticlepeer-review


The activity of the plasma membrane Na+/K+-ATPase and cellular sodium (Nai) and potassium (Ki) content were analysed in RBCs from 15 rheumatoid arthritis (RA) and 30 reference subjects (11 healthy controls, 12 osteoarthritis and 7 gouty patients). Na+/K+-ATPase activity was determined by measuring the inorganic phosphate (Pi) released by incubation in a reaction medium in the presence and absence of K ions or ouabain. Nai and Ki were measured with an ion-selective electrode analyser on the hemolysates, after washing the RBCs in 110 mM MgCl2. The Na/K-ATPase activity was significantly lower in RA patients than in both healthy controls and patients with osteoarthritis or gout. A slight but significant increase in Nai was observed in rheumatoid subjects. It is hypothesized that the decrease in the Na+/K+-ATPase activity in RA may be the result of a defective expression of membrane proteins, which is probably related to the altered cell sensitivity observed.

Original languageEnglish
Pages (from-to)301-305
Number of pages5
JournalScandinavian Journal of Rheumatology
Issue number4
Publication statusPublished - 1987


  • Erythrocyte membrane
  • Gout
  • Osteoarthritis
  • Rheumatoid arthritis

ASJC Scopus subject areas

  • Rheumatology
  • Immunology
  • Immunology and Allergy


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