Changes of ATP and lactate and the activity of phosphofructokinase in perihematoma region of rabbit brain after intracerebral hemorrhage / 中华神经科杂志

ABSTRACT

Objective To observe the changes of the content of ATP,lactate and the activity of phosphofructokinase(PFK) in perihemotoma region in rabbit brain after intracerebral hemorrhage. Methods(The rabbits) were divided into 3 groups normal group(N),hemorrhage group (H) and the sham group(S). The H and S groups were subdivided into 1 h, 6 h, 12 h, 24 h, 48 h and 72 h groups. A model of cerebral hemorrhage in rabbit with autologous blood infusion was set. The contents of ATP, lactate and water in perihemotoma region were measured and the metabolite concentration in edematous brain regions were corrected for dilution. The activity of phosphofructokinase was also determined.Results There was obvious edema in perihemotoma region at 1 hour postinfusion and getting more serious at 72 hours. ATP was moderately decreased at 1 hour, and remained in a similar level until 12 hours. There appeared another evident decrease in 24 hours [(13.29?2.92) ?g/g, about 58% of N group], and no obvious changes from 24 to 72 hours. The content of lactate increased in 1 hour and reached the peak at 12 hours [(21.01?0.18) ?mol/g]. Until 72 hours , the level of lactate [(12.89?0.25) ?mol/g] in hemorrhage group reach higher than in the normal and sham group. The activity of phosphofructokinase was decreased at 1 hour [(3.98?0.02) U/mg] and remained in a decreasing tendency to 72 hours. Conclusion The failure of energy metabolism occurs in 24 hours postinfusion,coming late somewhat to the brain edema. The result might be related to the changes of some enzymes, maybe a key role in energy metabolism.