Contrib Nephrol. 1990;87:68-77.

Modulation of the production of erythropoietin by cytokines: in vitro studies and their clinical implications.

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Physiologisches Institut I, Rheinische Friedrich-Wilhelms-Universität, Bonn, BRD.

Abstract

The etiology of the anemia of chronic disorders is complex. Factors which clearly contribute to the suppression of erythropoiesis are (a) reduced iron availability and (b) stimulation of the synthesis of immunomodulatory peptides such as IL-1, TNF-alpha and IFN-gamma, which inhibit the proliferation of erythrocytic progenitors in the bone marrow. The question as to whether lack of EPO is of general importance in the pathogenesis of the anemia of chronic inflammatory and malignant diseases is still a subject of controversy. The present in vitro studies show that IL-1 and TNF-alpha, but not IFN-gamma significantly lower the pO2-dependent formation of EPO in HepG2 cultures. In addition, clinical examples are given of anomalously low or high EPO levels in association with diseases involving the immune system. It is proposed that monokines and related immunomodulatory peptides could play a role in the control of the production of EPO.

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