各種動物におけるクレアチンキナーゼに関する比較検討

抄録

The biochemical properties of creatine kinase (CK) isoenzymes were compared in various animals and the following characteristics were noted. 1. Isoenzyme electrophoretic patterns with CK₁ and CK₃ were observed in rat, rabbit, dog, miniature pig, mouse, and monkey plasma. 2. The activity of platelet rich plasma CK was much higher than that of the corresponding platelet poor plasma enzyme in rabbit, dog, rat, and miniature pig. 3. Plasma CK was markedly different in substrate affinity among the species. The apparent K_m values well correlated with the percentage of CK₁ or CK₃ fraction in the plasma of various animals. 4. Upon incubation at 37°C, CK activities in rat and mouse plasma decreased rapidly, and the recovery of enzyme activities was only slight after the addition of sulfhydryl agents. On the other hand, in the presence of sulfhydryl agents, CK in human and monkey plasma were completely protected from loss of activity at 37°C.