Increased levels of interleukin-6 (IL-6) in serum and spontaneous in vitro production of IL-6 by lymph node mononuclear cells of patients with angio-immunoblastic lymphadenopathy with dysproteinemia (AILD), and clinical effectiveness of cyclosporin A.
LEUKEMIA(1996)
Abstract
Serum levels of cytokines and in vitro cytokine production by lymph node mononuclear cells (LNMC) were studied in four patients with angio-immunoblastic lymphadenopathy with dysproteinemia (AILD) or AILD-type T cell lymphoma. An increased level of serum interleukin-6 (IL-6) was detected on initial diagnosis in both of two patients examined. Spontaneous production of IL-6 by LNMC was detected in all four patients studied. Immunosuppressive therapy with cyclosporin A (CsA) was attempted in a 68-year-old man, who was refractory to intensive combination chemotherapy. The increased level of IL-6 in this patient decreased to normal within 3 weeks of CsA administration and the patient became symptom-free. One and a half months later, the IL-6 level gradually increased along with clinical exacerbation. We also measured serum levels of IL-1 alpha, IL-2, IL-4, IFN-alpha, gamma and TNF-alpha in parallel with IL-6, but these factors were only sporadically detected. IL-6 production by LNMC was stimulated by IL-2 but inhibited by CsA. These observations suggest that IL-6 is one of the important cytokines to be involved in the pathophysiology of AILD and CsA is a useful reagent for relieving symptoms.
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Key words
angio-immunoblastic lymphadenopathy with dysproteinemia (AILD),immunosuppressive therapy,cyclosporin A(CsA),interleukin-6 (IL-6),cytokines
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