BACKGROUND: PI3K is a family of enzymes involved in insulin signal transductlon pathway, the abnormal expression of which would affect synthesis, secretion, and migration of GLUT4, therefore, results In increased blood sugar, eventually, leads to diabetes.OBJECTIVE: To discuss the effects of insulin combined with selenium on PI3K and GLUT4 expression in cellular signal transduction of skeletal musde in diabetic rats.METHODS: Sprague Dawley (SD) rats were randomly divided into the control, diabetic, insulin-treated diabetic, selenium-treated diabetic and combination administration groups. All rats were prepared for diabetic models by injecting 50 mg/kg Streptozocin exception of the control group. Rats in the control and diabetic groups ware free to food and water; in the insulin treatment group,rats were subcutaneous injected 1 U/(kg·d) insulin. Rats in the selenium treatment group ware treated with a dose of 180 pg/kg per day of sodium selenite dissolved in redistilled water by gavage; and in the combination administration were given both treatments for 4 successive weeks. The levels PI3K end GLUT4 in skeletal muscle were estimated using Western blotting and immunohistochemistry techniques.RESULTS AND CONCLUSION: Immunohietochemistral results were accordance to Western blotting results, which showed the combination of insulin and selenium can remarkable Increase the levels of PI3K in skeletal muscle and GLUT4 in skeletal muscle membrane fraction, therefore, enhance the insulin signal transduction pathway.

The effects of ZS on plasma lipids and lipoprotein-cholesterins of rats fed on normal diet and rats fed on rich-fat diet were studied. It was found that ZS at 64 mg/kg?d-1 ip for 20 d could reduce the levels of TC and LDL-c, increase HDL-c and HDL 2 -c of rats fed on normal diet. ZS at same dosage could reduce TG, and increase HDL2-c of rats fed on rich-fat diet. It was demonstrated by this study that ZS could be of great advantage to protection from as in rats.

This study is to investigate the effect of low doses of insulin (1 u x kg(-1)) and selenium (180 microg x kg(-1)) in combination on general physiological parameters and insulin signal molecules in cardiac muscle of STZ-induced diabetic rats. The levels of blood glucose were estimated using One Touch SureStep Blood Glucose meter. HbA1c levels were estimated using microcolumn assay. TG and TC were estimated using enzymatic assay. The levels of PI3K and GLUT4 in cardiac muscle were examined by immunoblotting and immunohistochemistry. The result showed that insulin in combination with selenium could significantly lower blood glucose and blood lipid levels and markedly restored the PI3K and GLUT4 levels in cardiac muscle. It could be concluded that there was cooperation between insulin and selenium, and that treatment of diabetic rats with combined doses of insulin and selenium increased cardiac glucose uptake by upregulating the level of PI3K-mediated GLUT4 in cardiac muscle, eventually ameliorating myocardial dysfunction.

The effects of Dimethyl trilobine Iodide (DTI) on the blood lipids and lipoprotein choieslerol of rats and hemorrheology of rabbits were studied An peritoneal injection of DTI at the dosage of 0.5mg/kg could increase the serum TG of normal rais and reduce the HDL-c and HDL-c/LDL-c of rats fed with normal and fat-rich diets. An intravenous injection of DTI at the dosage of 10?g/kg accelerated formation of thrombus in vitro and at 5?g/kg and 10?g/kg elevated plasma mucosity at high sheafing. It was demonstrated that DTI had probably unfavorable effects on mediation of blood lipids of rats and hemorrheology of rabbits.

The effects of flavones of epinedium brevicornum maxim (FEBM) on hemorrheological Parameters of rabbits were studied. It was found that FEBM at 0.1 or 0.4g?kg~(-1)?d~(-1)ig b. i. d. could inhibit thrombosis in vitro,at 0.4 g?kg~(-1)? d~(-1) could reduce blood mucosity at 2～40 s~(-1) shearing and inhibit agglutination of red cells. It was demonstrated that the inhibition of thrombosis and the reduction of blood mucosity might be due to the effects of FEBM on agglutination of red cells.

Objective To study the sedative and hypnotic effects of oil of spine date seeds by different extraction technologies(compression and supercritical CO2 extraction,OSDSE and OSDSS) in mice.Equivalence test was used to test the effects.Methods Spontaneous activity and tolerance were observed by photoelectric counting method after long-term intragastric administration of OSDSE and OSDSS in mice.The sleeping time and delitescence induced by above threshold dose of pentobarbital sodium and sleeping number induced by below threshold dose of pentobarbital sodium were utilized to observe the hypnotic effect of OSDSE and OSDSS in mice.Diazepam was applied as a positive control drug.Results OSDSE and OSDSS could obviously reduce spontaneous activity,increase sleeping time and sleeping number in mice,while the sleeping delitescence was shortened.All the effects induced by OSDSE and OSDSS were equivalent.The inhibitory effect of spontaneous activity was enhanced following repeated administration,while the effect of diazepam was reduced.Conclusion Both oils of spine date seeds can induce sedative and hypnotic effects without tolerance.They have equivalent effects on sedation and hypnosis.

It was found that there were 31?s 13 ganglia or 1983 ?s 331 neurons ( n = 6) in canine right atrial ganglionated plexus (RAGP). Nicotine (100 ?g) was administered to the plexus in 30 anesthetized open-chest dogs. Either positive or negative inotropic and chronotropic responses were elicited. Control injections of 0. 1 m1 NS into RAGP and injections of nicotine (100 ?g and 200?g) did not elicite any cardiac responses. Following acute decentralzation of hearts, nicotine (100 ?g ) was againadministered to RAGP. Some positive and negative responses were still elicited, but frequency of the responses was reduced. It is concluded that nicotine can directly activate efferent sympathetic and parasympathetic neurons of RAGP. and indirectly activate them by stimulation of afferent neurons, these nicotine sensitive cardiac neurons can modulate cardiac function in ifferent tendencies.

Objective To investigate the protective effect of ascorbic acid on myocardium from ischemia and reperfusion injury and its electrophysiological mechanism. Methods Using modified Ferrier's arrhythmia induced by ischemia and reperfusion injury in isolated guinea pig right ventricular wall. Results Ascorbic acid at 5, 10, 50 and 100μmol/L slightly decrease incidence of ischemia arrhythmia (P ＞ 0. 05). In contrast, ascorbic acid at 10, 50 and 100μmol/L significantly reduced the incidence of arrhythmia during early reperfusion(2～12min) (P ＜ 0. 01 or P ＜ 0. 001). Ascorbic acid at 5～ 100μmol/L didn't reverse the abbrevating of APD of endocardium and epicardium and didn't affect the conduction time in endocardium (P ＞ 0. 05). However, ascorbic acid abbreviated epicardial conduc tion time significantly (P ＜ 0. 05 or P ＜ 0. 01 or P ＜ 0. 001 ). Conclusion The study suggests that ascorbic acid might exert antiarrhythmic effect via alleviating conduction abnormity to avoid transmural reentries during ischemia and early reperfusion.

Objective To evaluate the effect of low-dose insulin [1 U/(kg · d)] in combination with selenium [180 g/(kg · d)] on general physiological parameters and glucose transporter (GLUT4) level in skeletal mnscle of streptozotocin (STZ)-induced diabetic rats. Methods Diabetic rats were treated with insulin, selenium, and insulin and selenium in combination for four weeks. The level of blood glucose was determined using One Tonch SnreStep Blood Glucose meter and the level of GLUT4 in skeletal muscle was examined by immunobiotting and immnnohistochemistry. Results Our data showed that insulin in combination with selenium could significantly lower blood glucose level and restore the disturbance in GLUT4 level in skeletal muscle. Treatment with insulin was only partially effective in restoring diabetic alterations. Conclusion It can be concluded that there is a synergistic action between insulin and selenium, and that treatment of diabetic rats with combined doses of insulin and selenium is effective in the normalization of blood glucose level and correction of altered GLUT4 distribution in skeletal mnscle of diabetic rats.