KCNQ channels are an important sub-family in potassium channels. They are divided into five subtypes, including KCNQ1, KCNQ2, KCNQ3, KCNQ4, KCNQ5. KCNQ channels have a wide range of physiological and pathophysiologi-cal correlates. KCNQ1 (KvLTQ1) forms cardiac-delayed rectifier-like K+ current in the heart with other subunits. Mutations in this channel can cause one form of inherited long QT syndrome (LQT1). KCNQ2 and KCNQ3 heteromultimers are thought to underlie the M-current; mutations in these genes may cause an inherited form of juvenile epilepsy. The KCNQ4 gene is thought to encode the molecular correlate of the 7K.n in outer hair cells of the cochlea mutations whose mutation leads to a form of inherited deafness. KCNQ5 co-assemble with KCNQ3 in brain, and may also play a role in the M-current heterogeneity.

10.3969/j.issn.2095-4344.2013.26.021

Objective To investigate the myocardial protective effects ,mechanism and safety of recombinant human erythropoie-tin(rHuEPO) pretreatment in the patients undergoing cardiac surgery with cardiopulmonary bypass (CPB) .Methods Thirty pa-tients with rheumatic heart disease undergoing valve replacement surgery were randomly divided into the observation group and the control group ,15 cases in each group .The observation group was given rHuEPO 300IU/kg by hypodermic injection on preoperative 2 d ,once daily for twice .The control group was given the same dose of normal saline .The blood routine was performed before sur-geryandonpostoperative7d.Thelevelsofcreatinekinaseisoenzyme(CK-MB)andtroponinT(cTnT)weredetectedbeforeopera-tion ,at 6 ,24 ,72 h after the aorta opening (T0 ,T6 ,T24 ,T72 ) .At the end of CPB ,myocardial biopsy was conducted for detecting the myocardial apoptosis index (AI) .The CPB time ,aortic cross clamp(ACC) time ,postoperative ICU stay ,blood transfusion and post-operative complications were recorded .Results The level of postoperative CK-MB and cTnT in the two groups were significantly increased after the aorta opening ,which at T6 was highest ,followed by a downward trend .The levels of CK-MB and cTnT at vari-ous time points in the observation group were significantly lower than those in the control group .The main effect of rHuEPO pre-treatment had statistical difference between the two groups (P= 0 .01) .Myocardial AI in the observation group was significantly lower than that in the control group ,the difference showing statistical significance (P<0 .01) .The observation group had no risk leading to obviously increase postoperative Hb ,Hct values and thromboembolism ,but the postoperative blood transfusion amount was reduced .Conclusion rHuEPO pretreatment has the protective effect on myocardium in the patients undergoing cardiac surgery under CPB ,which can reduce myocardial apoptosis and has safe reliability .

Objective To evaluate the outcome of the old patients who were treated for femoral neck fractures in our hospital during 2000-2007. Methods A retrospective study was conducted to evaluate outcomes of the 139 old patients who had received internal fixation for femoral neck fractures in our department during 2000-2007. The mechanism of injury, duration between injury and hospitalization, severity of fracture, anamnesis, time of hospital stay, anaesthesia, operation, postoperative complications, fracture healing, in-cidence of avascular necrosis of femoral head, failure of fixation, and functional restoration of the patients were documented. Results Fracture healing was found in 126 cases (90.6%). Time to healing ranged from 2 to 20 months (average, 6.2 months). Failure of fixation and nonunion were found in 13 cases (9.4%). Avascular necrosis of femoral head occurred in 9 cases (6.5% ). Of them, 81 patients(58.3%) restored their gait as normal as before whereas 50 patients(36.0%) walked with crutches. Conclusions Internal fix-ation can be suggested for old patients with femoral neck fracture, considering a high rate of fracture healing and a low rate of avascular necrosis of the femoral head. Early operation is recommended if the general con-dition of the patient has been well controlled.

Objective To study the content change and clinic significance of NO,ET,D-Dimer with UK in the treatment of ACI.Method NO,ET,and D-Dimer were measured before and after 2 h,4 h,24 h,48 h in 38 ACI patients with treatment of UK by the ways NO-2/NO-3 content measuring,radiation immunity analysis(RIA) and ELISA.Results NO in ACI was significantly low(P

AIM To study the effects of propafenone on Kv 4 2 and Kv4 3 potassium current. METHODS Whole cell patch clamp technique was used to record changes of Kv4 2 and Kv4 3 potassium currents. RESULTS ① Propafenone redu ced the amplitude of Kv4 2 and Kv4 3 currents, in a concentration-dependent, IC 50 was 10 3 and 71 ?mol?L -1 respectively. ② Propafenone inhibi ted Kv4 2 and Kv4 3 current inactivation, 10 ?mol?L -1 propafenone acce lerates Kv4 2 current inactivation constant from (38 9?2 1) ms to (9 9?1 8) ms; and shifted the steady state inactivation curves of Kv4 2 current to negative potentials. 100 ?mol?L -1 Propaf enone accelerates Kv4 3 current inactivation constant from (144 8?20 8) ms t o (18 5?2 8) ms; and shifted the steady state inactivation curves of Kv4 2 c urrent to negative potentials. ③ propafenone inhibited Kv4 2 and Kv4 3 curren t activation, 10 ?mol?L -1 propafenone shifted the steady state activati on curves of Kv4 2 current to negative potentials. 100 ?mol?L -1 propafe none shifted the steady state activation curves of Kv4 2 current to negative po tentials. CONCLUSION Propafenone, maybe, also exerts its effects via blocking Kv4 2 and Kv4 3 current to antiarrhythmia.

AIM To study the effects of H 2O 2 on transient outward potassium current METHODS Whole cell patch clamp technique was used to record changes of I A in the cultured rat hippocampal neurons RESULTS After exposure to 30 ?mol?L -1 H 2O 2 for 12 h (1) decreased I A current density from (53 8?15 8) PA?PF -1 to (18 5?6 2) PA?PF -1 ( n=10,P

Objective Through the correlation study of fibroblast growth factor 23 (FGF-23) and chronic heart failure to investigate the pathogenesis of chronic heart failure and provide a new method for chronic heart failure diagnosis.Methods One hundred and twenty-eight chronic heart failure patients (chronic heart failure group) were involved in this study.According to the level of left ventricular ejection fraction (LVEF),they were divided into LVEF slightly lowing group (LVEF 40％-50％,50 patients),LVEF moderately lowing group (LVEF 30％-39％,35 patients),LVEF severely lowing group (LVEF ＜30％,43 patients).Fifty healthy people was as control group.The level of FGF-23,parathyroid hormone (PTH),creatinine (Cr),urea nitrogen (BUN),blood calcium,blood phosphorus,N-terminal pro-B-type natriuretic peptide (NT-proBNP) were detected.The patients in two groups were performed color Doppler ultrasonography.Results The level of FGF-23,blood phosphorus,PTH,left ventricular mass index (LVMI),NT-proBNP in chronic heart failure group were significantly higher than those in control group [68.44(55.85-94.73) ng/L,34.18(30.57-38.87) ng/L,(1.13 ± 0.13) mmol/L vs.(1.02± 0.12) mmol/L,(15.51 ± 3.99) ng/L vs.(9.97 ± 0.89) ng/L,(112.27 ± 52.02) g/m2 vs.(71.37 ± 12.95) g/m2,(6 265.3 ± 15 991.6) ng/L vs.(76.12 ± 51.80) ng/L](P ＜ 0.01).The level of blood calcium,glomerular filtration rate (GFR) in chronic heart failure group were significantly lower than those in control group [(2.28 ±0.16) mmol/L vs.(2.48 ±0.13) mmol/L,(78.28 ± 14.20) ml/ (min ·1.73 m2) vs.(85.03 ± 14.44)ml/ (min·1.73 m2)] (P ＜ 0.01).Spearman correlation analysis showed that FGF-23 had positive correlation with age (r =0.256,P ＜0.01),blood phosphorus (r =0.326,P ＜0.01),PTH (r =0.584,P ＜0.01),NT-proBNP (r =0.799,P ＜ 0.01),LVMI (r =0.540,P ＜ 0.01),and had negative correlation with blood calcium (r =-0.308,P ＜ 0.01),GFR(r =-0.527,P ＜ 0.01).The level of FGF-23 was increased when LVEF reduced.Conclusions It has significant correlation between the level of FGF-23 and the degree of chronic heart failure.It suggests that the level of FGF-23 can evaluate the myocardial systolic function and ventricular remodeling.

Objective To study changes of AMPA receptors expression in nucleus accumbens and hypothalamus of methamphetamine dependent rats,and the therapeutical effect of rhynchophylline.Methods SPF male rata were randomly divided into normal control group,model group of methamphetamine,low dose of rhynchophylline group and high dose of rhynchophylline group(n=8 in each group).Experiment of conditioned place preference(CPP)was used to build the model of methamphetamine dependent rata.Western blotting was used to examine the changes of GluR2/3 subunits expression.The time of staying in drug-paired compartment of rats was used independent-samples t test to gather statistics,and the photodensity of proteinum strap was used One-Way ANOVA to gather statistics.Results Compare with rats in normal control group(the time of staying in drug-paired compartment of rats was(383.00±38.20)s),the rats produced CPP after treated with methamphetamine(the time of staying in drug-paired compartment of rats was(536.20±57.49)s),and low(30mg/kg) and high (60 ms/kg)dose of rhynchophylline(the time of staying in drug-paired compartment of rats were(299.80±15.96)s and(189.40±59.02)s)both could eliminate CPP effect.Compare with rats in normal control group (the ratio of value of average gray scale were(0.54±0.04)INT·mm~2 and (0.70±0.04)INT·mm~2),GluR2/3 subunits expression in nucleus aecumbens increased significantly in model group(the ratio of value of average gray seale was(0.89±0.03)INT·mm~2)and low dose of rhynchophylline group(the ratio of value of average gray seale was (0.93±0.03)INT·mm~2,P<0.01),which decreased significantly in hypothalamus(the ratio of value of average gray scale were (0.53±0.03)INT·mm~2 and (0.52±0.02)INT·mm~2,P<0.01).But GluR2/3 subunits expression in nucleus accumbens and hypothalamus of rats in high dose of rhynchophylline group(the ratio of value of average gray scale were (0.57±0.06)INT·mm~2 and (0.65±0.01)INT·mm~2) just liked the expression of normal control group(P>0.05).Conclusion GluR2/3 subunits expression of methamphetamine-induced CPP rats increased in nucleus accumbens but decreased in hypothalamus.High dose of rhynchophylline can reverse such changes and rebound the expression to normal level.

Objective To investigate effect of transforming growth factor β3(TGFβ3)on expression of MMP-9,MMP-2,TIMP-1 and collagen I in rats with liver fibrosis through transduction by recombinant adeno-associated virus 2(rAAV2).Methods Rats were randomly divided into 4 groups:normal control group,model group,negative control group and TGFβ3 group.Liver fibrosis model was induced by hypodermic injection of 40% CCl4.rAAV2-TGFβ3,was injected via vena caudalis of the rats one week before CCl4 Was given.All rats were sacrificed and the liver tissues were taken 8 weeks afler injection of CCl4.The histopathological changes were observed on HE sections;the expressions of MMP-9,MMP-2,TIMP-1 and collagen I were examined by histochemistry and the positive area rates were semi-quantitatively analyzed.Results Compared with the model group and negative control group,the decreases of inflammatory infiltration and collagen fibers hyperplasia were observed in the TGFβ3 group,and the expression of MMP-9 increased(q=23.664,27.746,P<0.01),the expression of collagen I(q=5.503,5.251,P<0.01)and TIMP-1(q=5.800,8.608,P<0.01)decreased,but that of MMP-2 was not changed(q=2.1 08,0.996,P>0.05).Conclusion rAAV2-TGFβ3 can reduce the histological damage and degree of liver fibrosis in rats by inhibiting expression of TIMP-1 and collagen I,and upregulating expression of MMP-9.