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The role of inflammation in the anaemia of end-stage renal disease.

Nephrology Dialysis Transplantation

Models, Biological, physiopathology, complications, Kidney Failure, Chronic, physiology, Inflammation Mediators, Inflammation, Humans, Cytokines, etiology, drug therapy, Anemia

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      Abstract

      Chronic inflammation is a common feature of end-stage renal disease (ESRD) that is gaining increasing attention as a major cause of morbidity and mortality. It is well established that ESRD per se carries a heightened risk of inflammatory disorders and other co-morbid conditions, but it should also be pointed out that dialysis treatment per se can bring additional risk factors for inflammation, such as impure dialysate or bio-incompatible membranes. Inflammation has recently been associated with atherosclerosis and malnutrition in ESRD, and this link has led to the development of the malnutrition, inflammation, atherosclerosis (MIA) hypothesis. This describes a syndrome whereby raised levels of pro-inflammatory cytokines (such as IL-1, IL-6 and TNF-alpha) are a common link between malnutrition, inflammation and atherosclerosis. Also, anaemia appears to be an important element linking elevated cytokine levels with poor patient outcomes. Several mechanisms for cytokine-induced anaemia have been proposed, including intestinal bleeding, impaired iron metabolism and suppression of bone marrow erythropoiesis and erythropoietin production. These effects suggest that pro-inflammatory cytokines may also be an important cause of lack of response to recombinant human erythropoietin (rh-Epo) therapy. In the light of this putative role of pro-inflammatory cytokines, anti-cytokine agents may prove useful to optimize efficacy of rh-Epo in anaemic chronic renal failure patients. Other potential therapeutic strategies include minimizing exposure to causes of inflammation from various co-morbid conditions, such as persistent infections and chronic heart failure.

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