Effects of erigeron on hippocampus adenosine triphosphate of gerbils with cerebral ischemia reperfusion injury

Yan ZHANG; Qun CHEN; Haozhong DING; Yinming ZENG

ABSTRACT

BACKGROUND:

Erigeron, the inhibitor of protein kinase C, functions to decrease the death of neurocytes caused by cerebral ischemia reperfusion.

OBJECTIVE:

To study the effects of erigeron on hippocampus adenosine triphosphate (ATP) and adenosine triphosphatase (ATPase) of gerbils with cerebral ischemia reperfusion injury.

DESIGN:

A random controlled experiment.

SETTING:

Anesthesia Department of the Fourth Hospital of Suzhou University, Anesthesia Department of the Fourth People's Hospital of Wuxi City, and Anesthesia Department of the Affiliated Hospital of Xuzhou Medical College.MATERIALS The experiment was done in the key laboratory of anesthesiology of Jiangsu Province from March 2002 to May 2003. The 90 Mongolian gerbils were divided into 9 groups sham operated group, cerebral ischemia group, cerebral ischemia reperfusion 1 hour group, cerebral ischemia reperfusion 12 hours group, cerebral ischemia reperfusion 24 hours group, erigeron + cerebral ischemia group, erigeron + cerebral ischemia reperfusion 1 hour group, erigeron + cerebral ischemia reperfusion 12 hours group, and erigeron + cerebral ischemia reperfusion 24 hours group,with 10 gerbils in each. The erigeron injection with flavone 4.5 g/mL was made by the Biomedicine Factory of Yunnan Province and numbered 990103.

METHODS:

Apart from the sham operated group, all groups were established the ischemia reperfusion models. The erigeron groups were abdominally injected erigeron 10 mL/kg 30 minutes before the ischemia. Meanwhile, the other groups were injected the normal saline 10 mL/kg. The 6 gerbils of each group were taken blood for testing ATP content and ATPase activity and the rest 4 were only examined the pathological changes of neurocytes of hippocampus CA1 region. During the ischemia, the temperature of drum membrane (reflecting the brain temperature) was monitored and kept at (37±0.2)℃ in order to avoid the influence of temperature on the result. The comparison among groups was shown with the single factor analysis of variance.CA1 region.of ATP content and ATPase activity Compared with the cerebral ischemia reperfusion 24 hours group, the ATP content of the erigeron 1, 12, 24 hours groups was obviously increased [(0.25 ±0.08), (0.81 ±0.12), (0.58 ±0.07),(0.43±0.09) mmol/kg, P ＜ 0.01], the Na+-K+-ATPase activity was obviously P ＜ 0.01], and the Ca2+-ATPase activity was also obviously promoted days after ischemia, the findings under the low power lens were the pyramidal belt of the cerebral ischemia reperfusion groups became thinner and loose and even disappeared, but that of the erigeron groups became obviously wider and thicker; the findings under the high power lens were most of the pyramidal cells of the cerebral ischemia reperfusion groups were in the state of coagulation necrosis, and those survived pyramidal cells with complete nuclear membrane and clear nucleole were very few, but the survived pyramidal cells of the erigeron groups were obviously more than those of the cerebral ischemia reperfusion groups.

CONCLUSION:

Erigeron increases obviously the ATP content after ischemia reperfusion, especially at the early stage of reperfusion, and at the same time, the ATPase activity is also in an improved tendency, relieving the ischemia reperfusion injury and protecting the neurocytes.