To study the effect of ischemic preconditioning(IP) on the expression of HSP 70 mRNA in postischemic spinal cord of rabbits, the spinal cord ischemic model was established by inflating the balloon of a 4F Swan Ganz catheter positioned in the abdominal aorta of the rabbits. The rabbits were divided into sham operated group, ischemic group and IP group. The expression of HSP 70 mRNA in postischemic spinal cord was observed by using the method of RT PCR at 4 hours, 2 days and 5 days after spinal cord ischemia respectively. No expression of HSPs 70 mRNA was found in sham operative group. Compared with ischemic group,the expression of HSP 70 mRNA in spinal cord of IP group was strengthened( P

Objective To explore the mechanism of relieving symptoms of angina pectoris with transmyocardial laser treatment. Methods Twenty mongrel dogs were divided randomly into 4 groups (5 dogs each): I. sham-operated negative control animals undergoing thoracotomy and pericardiotomy only; II. ligation of the coronary arteries to create acute myocardial ischemia; III. 40 minutes after production of acute myocardial ischemia, transmyocardial punctures were made with high power CO_2 laser; IV. chemical destruction of cardiac nerves by application of 85% phenol to the epicardium after myocardial ischemia. The myocardium was harvested for examination 2 weeks later. Cardiac sympathetic afferent nerve function and innervation was assessed with immunohistochemical staining of tyrosine hydroxylase (TH), which was the specific enzyme of sympathetic nerves, and computer image analysis was done. Histopathological changes in myocardium were also evaluated with haematoxylin-eosin staining. Results Immunohistochemical analysis showed positive staining in I and II groups but negative or weakly positive in III and IV groups. Computer image analysis showed the same results, and there was significant difference among I, II and III, IV groups (P

To determine the change of myocardial perfusion and metabolism after intramyocardial administration of VEGF 165 cDNA, 36 dogs were randomly divided into 3 groups( n =12): VEGF 165 cDNA plasmid groups non VEGF 165 cDNA plasmid group, and myocardial infarction as control group. The results showed that the amount of perfusion and intake of FDG of anterial, anterial lateral and anterial septum walls of left vetricle at 4th and 8th week in VEGF 165 cDNA plasmid group were larger than those in control group ( P