POLYMORPHONUCLEAR LEUKOCYTE INCLUSIONS AND IMPAIRED BACTERIAL KILLING IN PATIENTS WITH FELTYS SYNDROME

Abstract

Humoral factors, phagocytosis, bactericidal capability, and ultrastructural morphology of blood polymorphonuclear leukocytes were investigated in 10 patients with Felty''s syndrome [rheumatoid arthritis with neutropenia and spenomegaly]. Five patients suffered significant bacterial infections in the past 2 yr, while 5 other patients did not have bacterial infections. The patients with infections had higher concentrations of serum cryoglobulins, and their neutrophils contained immunoglobulin inclusions as seen by immunofluorescent and EM. Leukocytes from these patients showed decreased ability to kill Staphylococcus aureus and a minor defect in phagocytosis. There was a generalized subcellular disorganization of these inclusion containing neutrophils and a slower than normal release of lysosomes. Several of these abnormalities may contribute to an increased susceptibility to bacterial infections in patients with Felty''s syndrome.