The H2O2 has been shown to have comprahensive actions on various ion channels of cell membrane. But it has different effects on different tissues. H2O2-induced a dose dependent decreasing L- type Ca2+ current on cultrued Lymnaea neurons. In sheep cardiac SR, H2O2 plays an important role in regulating directly on RyR Ca2+-release channel that caused an increasing of P0, but it was no effects on conductance. It indicated that H2O2-induced different activities on KCa channel with different tissues. In guinea pig ventricular myocytes, H2O2-induced increase in KATP channels. There are few data on the effects of H2O2 on whole cell Na+ currents and single Na+ channels.

Accidents, Occupational ; Acrylamide ; poisoning ; Adolescent ; Critical Illness ; Humans ; Male ; Young Adult

Adult ; Aged ; Benzidines ; toxicity ; Coloring Agents ; Humans ; Male ; Middle Aged ; Occupational Exposure ; Urinary Bladder Neoplasms ; epidemiology

Polyketides are very large group of natural products with functional and structural diversity.Most of them are produced by microor- ganism and have medicinal activities,including antibiotic,anticancer,antifungal and antiparasitic properties.The researchs in this area have progressed greatly.More and more polyketides are discovered,on the other hand the mechanisms of biosynthesis of those various polyketides are researched more deeply and clearly.The article reviewed the progress of the research in the diversity of polyketide synthases and the mechanisms of polyketide biosynthesise.

Angiogenesis Inhibitors ; pharmacology ; Angiostatins ; pharmacology ; Animals ; Antigens, CD ; metabolism ; Cadherins ; metabolism ; Humans ; Matrix Metalloproteinase Inhibitors ; Matrix Metalloproteinases ; metabolism ; Microvessels ; metabolism ; Neoplasms ; blood supply ; pathology ; Neovascularization, Pathologic ; metabolism ; pathology ; Vascular Endothelial Growth Factor A ; metabolism

Objective To investigate the expression of T help cell 1(Th1),T help cell 2(Th2)and related cytokines interleukin 12 (IL -12)and interleukin 4 (IL -4)in the lumbar disc herniation and their clinical significance. Methods 30 postoperative patients with lumbar disc herniation were included as observation group.The control group included 10 patients with lumbar fracture.Flow cytometry was used to distinguish the Th1 and Th2 cells.ELISA was used to measure the expression of interferon γ(IFN -γ),IL -12(the cytokines secreted by Th1 cells)and IL -4 (the cytokine secreted by Th2 cells).RT -PCR was used to detect the mRNA levels of STAT4 and STAT6.Results The distribution of Th1 /Th2 cells was higher in patients with lumbar disc herniation compared to the control group [(6.24 ±2.89)vs (25.12 ±3.20),t =16.26,P <0.05;(2.68 ±0.58)vs (8.16 ±1.20),t =3.84,P <0.05]. The levels of IFN -γand IL -12 in the study group were significantly higher than the control group,the differences were statistically significant[(23.47 ±5.61)vs (7.65 ±3.21),t =8.422,P <0.05;(1.52 ±0.87)vs (5.34 ± 1.39),t =8.135,P <0.05].The level of IL -4 was undetectable in the control group,however,IL -4 expressed in the study group.The expressions of IL -12,IFN -γand IL -4 in the study group were negatively correlated by Spearman correlation analysis (r =-0.57,P <0.05;r =-0.23,P <0.05).In addition,the mRNA level of STAT4 was higher in patients with lumbar disc herniation compared to the control group[(3.21 ±0.49)vs (1.12 ±0.24), t =13.15,P <0.05].Conclusion The expressions of Th1 cells,Th2 cells and related cytokines were participated in the pathogenesis of lumbar disc herniation.

Objective To compare the effectiveness and safety of continuous and intermittent ice compression therapy following total knee arthroplasty surgery. Methods Eighty patients were divided into two groups receiving continuous or intermittent 30 minutes every 2 two hours within 48 hours after the operation. The subjective pain (VAS score), additional pain-killer use, swelling of extremity, drainage, range of motion were observed and compared. Results Patients in the observation group had less pain than those in the control group (Z values in the first 3 postoperative day was-2.722,-3.359,-2.039, respectively, P<0.05). Less pain-killers were required in the experimental group (Z=-2.559, P<0.05). The postoperative swelling by the thigh circumferences in the first day in the observation group was (1.84 ± 1.11) cm, which was milder than the (3.30 ± 1.69) cm of the control group (t=4.565, P<0.01). So was it in the calf circumferences, (0.94 ± 0.89 ) cm vs. (1.46 ± 0.91) cm (t=2.627, P=0.01). Within the first 3 days after the operation, this mildness still existed in aspect of thigh circumferences, which was (3.09±1.39) cm in the observation group vs the (4.09 ± 1.71) cm in the control group, t=2.869, P < 0.01. Conclusions Continuous ice compression therapy has better effects than intermittent 48 hours after total knee replacement, with functional training and exercise not disturbed. It is considered safe and assured, and is therefore recommended.

Objective To evaluate the influence of dexmedetomidine（Dex） on sedation and requirement of propofol during anesthesia induction. Methods Thirty patients（ASA Ⅰ or Ⅱ） undergoing selective operation were randomly divided into 2 groups：Dexmedetomidine group （group D,n=15） or control group （group C,n=15）. Patients in the group D received 1 μg/kg dex diluted to 10ml over 10 min by pumped infusion and patients in the group C was simply recieved normol saline at the same way.Twenty minutes after administrating the drug,patients in both groups were pumped propofol at the speed of 0.4 mg·kg-1·min-1. When holding up jaw without movement,patients received 1 μg/kg fentanyl and 0.6 mg/kg rocuronium,and endotracheal intubated 1.5 minutes later. RE,SE,Ramsay sedation scale of the patients were recorded before（T0） and after 5,10,20 minutes（T1-T3） of drug adminstration.The minimum dose and total dose of propofol during induction were recorded.Results Compared with group C and T0,RE and SE in group D decreased obviously at T1-T3 （P0.01）,while Ramsay sedation scale rised significantly （P0.01）. Compared with group C,the minimum dose and the total dose of propofol decreased obviously in group D during induction （P0.01）.Conclusion Dexmedetomidine causes sadetive without respiratory depression,and has the propofol sparing effect during anesthesia induction.

Adrenal Cortex Hormones ; therapeutic use ; Adrenergic beta-Agonists ; therapeutic use ; Anti-Asthmatic Agents ; therapeutic use ; Asthma ; drug therapy ; Humans ; Medication Adherence

Objective: To induce human dental mesenchymal cells to differentiate into odontoblasts in vitro.Methods:The cultured human dental mesenchymal cells were induced in two-dimensional culture model by bFGF(10 ng/ml)+IGF-1(100 ng/ml) or TGF-?1(5 ng/ml) for 4-7 d. Cell growth and morphology after induction were observed. The expression of human DSP protein and DSPP mRNA were detected by immunofluorescent staining and RT-PCR. Mineralization capability of the induced cells was evaluated using Von Kossa staining. Results:In both bFGF+IGF and TGF-?1 groups 20%-30% of the induced cells showed long single process.DSP protein and DSPP mRNA were observed in the induced cells.Mineralized nodules were found in the induction cultures.Conclusion: bFGF+IGF-1 or TGF-?1 can induce dental mesenchymal cells to differentiate into odontoblasts.