Eglin C fails to reduce catabolism in acutely uremic rats.

Increased release of proteinases from polymorphonuclear leukocytes, namely elastase, has been incriminated to take part in the pathogenesis of enhanced muscle protein breakdown in acute renal failure. In order to investigate, whether inhibition of the granulocyte proteinase elastase and cathepsin G would have a beneficial effect on the extent of muscle protein degradation, eglin C, a potent inhibitor of the granulocyte proteinase elastase and cathepsin G, was administered intraperitoneally to acutely uremic rats. 48 hours after bilateral nephrectomy, eglin C-treated animals displayed no significant difference, as far as serum levels of SUN, glucose and Nt-methylhistidine are concerned. Similarly, eglin C treatment failed to reduce the stimulated activity of the alkaline myofibrillar proteinase in comparison to binephrectomized controls. Hence, according to these results, granulocyte proteinases do not seem to be an important mediator of uremic catabolism, since their inhibition by eglin C does not reduce enhanced protein breakdown in acutely uremic rats.