Guanylate cyclase activity in normal and diseased human muscle.

Abstract
Guanylate cyclase activity was studied in muscle of normal subjects and of patients suffering from muscular and neuromuscular diseases. In normal tissue a guanylate cyclase activity was found in both soluble and particulate fractions of homogenate. The kinetic analysis of the enzyme of soluble apparently differed from that of particulate fraction. A decrease of guanylate cyclase activity in crude homogenate was observed in muscular dystrophies, in neuromuscular atrophies and in inflammatory forms of muscle disease.