RESUMEN
Objective To investigate the pharmacological hypothermic effect of WIN55, 212-2 on neuronal apoptosis after cardiopulmonary resuscitation. Methods Cardiac Arrest ( CA ) was induced in Sprague-Dawley rats.Five minutes after onset of CA, cardiopulmonary resuscitation ( CPR) was carried out.At 30 minutes post-resuscitation, the animals were randomized into three groups (n=10 in each group): (1) WIN55, 212-2 hypothermia group [W group, WIN55, 212-2, 1 mg/(kg· h)].(2) Normothermia group (NT group, 5%DMSO);(3) WIN55, 212-2 with normothermia group (W+NT group, WIN55, 212-2, 1 mg/(kg· h).Animals in WIN55, 212-2 hypothermia group and WIN55, 212-2 with normothermia group were dealt with continuous intravenous infusion of WIN55, 212-2 [1 mg/(kg· h)] for 4 h, while rats in NT group were infused with equal volume of 5% DMSO instead.The survival time and neurological deficit score ( NDS) were observed.The CA models were established in three groups.After rats were sacrificed, the brains were harvested for detecting histopathological changes and apoptosis of neural cell at 24 h, 48 h and 72 h after ROSC respectively.Five animals of each group were chosen randomly ( random number ) .Results Body temperatures of rats in W group decreased from 37°C to 34°C in 4 hours.Accumulated survival rate in W group was higher than that in the other two groups ( P=0.02) .NDS was significantly improved in W group than that in the other two groups ( P<0.05) .Morphological change in W group was less serious than that in the other two groups.The number of neuron apoptosis in W group was smaller than that in the other two groups.Conclusions WIN55, 212-2 inducing pharmacologically hypothermia during post-resuscitation prolonged survival and improved cerebral function in rat cardiac arrest models.The beneficial effects of WIN55, 212-2 were associated with ameliorating the histopathological damage in brain and alleviating the neuron apoptosis.
RESUMEN
BACKGROUND: The patients with severe spleen rupture can save their spleen functions by auto-transplantation of the spleen tissues in the greater omentum. Whether the transplanted spleen tissues are regulated by nerves or not is still unclear. The growth associated protein, GAP-43, is a specific protein of the nervous system, and by testing the GAP-43 in the transplanted spleen tissues, nerve regeneration can be understood.OBJECTIVE: To study the mRNA expression of the GAP-43 in the regenerated spleen tissues at different phases after the auto-transplantation of the spleen tissues, and to find the regeneration regularity of the GAP-43 + nerves in the auto-transplanted spleen tissues.DESIGN: A randomized and controlled experiment SETTING: A teaching and research office of the surgical applied anatomy and operative surgery department in a university MATERIALS: The study was done in the Surgical Applied Anatomy and Operative Surgery Department of the Third Military Medical University of Chinese PLA from September 2002 to July 2003. A total of 120 Wistar mice were chosen. The mice were randomly divided into the experiment group and pseudo-operation group(control group) to make animal models. After the operation, mice of the two groups were fed under the same circumstances. The spleen tissues were respectively taken at the 15th, 30th, 60th,90th, 120th and 180th days after the operation for the study.METHODS: The general RNA was extracted from the tissues using the Tripure agent by the routine method. The general RNA was reverse transcribed into cDNA using the M-MLV reverse transcription kit. The mRNA of the GAP-43 was quantitatively measured using the gel pattern analysis.tern analysis.RESULTS: Totally 30 days after the transplantation of the spleen tissues, the mRNA of the GAP-43 was found to be expressed in the auto-transplanted spleen tissues. Ninety days after the operation, the expression reached the peak level. Totally 120 to 180 days after the operation the amount of the mRNA of the GAP-43 in the transplanted spleen tissues gradually got close to that in the normal spleen tissues.CONCLUSION: The expression of mRNA of the GAP-43 in the auto-transplanted spleen tissues suggests the regeneration of the nervous fiber in the transplanted spleen tissues.
