ABSTRACT
BACKGROUND: Distraction osteogenesis is an effective method for large bone defects, bone tumors and osteomyelitis. However, there is a lack of a standard model in the basic research concerning distraction osteogenesis. OBJECTIVE: To establish a rabbit femoral model of distraction osteogenesis and to assess its osteogenic effect. METHODS: Twenty male New Zealand rabbits were enrolled to establish the rabbit femoral model of distraction osteogenesis using a novel distractor. Subsequently, the gross observation and X-ray examination of the specimens were performed to assess the osteogenic effect. RESULTS AND CONCLUSION: Gross observation: on day 14 after fixation, there were light-colored and dense newborn bones distributing evenly in the distraction gap, and appeared with a columnar connection with the broken ends; the boundary with normal bones became vague. On day 35, the surface of newborn bones in the distraction gap showed the same color and texture with the normal ones, the boundary between the newborn and normal bones was difficult to distinguish, and the bone mineral density was increased notably. Radiology results: on day 14 after fixation, the stent was fixed stably, the broken ends got good reduction, and cloudy shallows connecting the two ends of the normal bones in the distraction gap and increased bone mineral density were detectable. Completely calcified new-born bones, intact bone cortex and open medullary canal were further visible on day 35. These results suggest that the rabbit femoral model of distraction osteogenesis is established successfully using the self-designed single-arm distractor based on rational surgical procedures and standard operations.
ABSTRACT
Objective To investigate the effect of risperidone on S100B protein and its intervention on the relapse of heroin addicts. Methods From January 2014 to March 2014, 70 cases heroin addicts in the second detection center in Xining were selected as objects, three patients dropped out, and the left were randomly divided into control group(n=33) and experimental group(n=34) , which were given detoxification for 10 days, rehabilitation for 5 days, while the experimental group were given risperidone intervention.The condition of craving degree for heroin, relapse and incidence of adverse reactions between two groups were compared.Serum S100B protein levels were detected by ELISA.The efficacy of risperidone was analyzed.Results The craving degree for heroin between two groups was of no significant differences, after drug treatment, the craving degree for heroin of experimental group were significantly lower than those of control group at the time-point of hospital discharge, 1 months after discharging and 3 months after discharging(P=0.013, P =0.008, P =0.005).The differences of relapse condition between two groups in 3 months after discharging were statistically significant (P=0.003), the relapse incidence of experimental group(11.8%) was significant lower than that of control group(54.5%). Besides, the differences of relapse condition among different craving degree groups were statistically significant in two groups respectively(P=0.005, P=0.008).Serum S100B protein levels of experimental group , in different periods were lower than those of control group, with statistical significance ( P<0.05); There were 5 cases of insomnia, 3 cases of headache, 3 cases of thirsty, 2 cases of mild extrapyramidal symptoms in test group, but all above were mild and relieved on their own after withdrawal, no similar symptoms were observed in control group.Conclusion Risperidone intervention is a safe and effective method to prevent heroin addicts from relapsing, it maybe with the mechanism of reducing the levels of serum S100B protein, but it needs further research and efforts to put it in clinical applications of herion addiction treatment.
ABSTRACT
Objective To explore tetrandrine on murine hemangioendothelioma cell and its mechanisms.Methods Explore the effect of tetrandrine on EOMA cells in time and concentration MTT experiment, the content of tetrandrine treated EOMA cells in different cell cycle detected by flow cytometry, speculated effect of tetrandrine on G1/S phase checkpoint for EOMA cells blocking.Western blot analyzed the molecular mechanism of tetrandrine induced EOMA cell block, and intracellular reactive oxygen species level were detected byflow cytometry.Then used the active oxygen scavenger NAC pretreated cells after drug incubation.Results Tetrandrine could inhibit the cell reproduction, and showed a concentration and time dependence, role in tetrandrine 20μM was significantly inhibited after 48 h.Tetrandrine caused mainly by EOMA cells during the cell cycle of G1/S phase cell block, so as to achieve the effect of inhibiting cell proliferation.Tetrandrine increased intracellular reactive oxygen species ( ROS) blockade effect of elevated levels of cell cycle to achieve, and the regulation of AKT, GSK-3 βand p53 cell cycle upstream protein level, finally maked the expression changes.Further research proved that, tetrandrine induced up-regulation of ROS level in cells to induce EOMA cell cycle arrest.Moreover, regulated by the ROS inhibitor NAC could significantly inhibit EOMA cell cycle factor.Conclusion Tetrandrine can inhibit tumor angiogenesis, which provides theory basis for clinical anti-cancer drugs in inhibiting tumor growth.
ABSTRACT
Chemical genetics is the science which takes the small molecular compounds as tools to solve the genetics problems or to disturb/adjust normal biological process so as to find out protein functions. Because the small molecules have the diverse chemical characters and the ability to identify the target proteins, they also can be filtrated on the basis of phenotype. So the methods of chemical genetics have been applied in almost all of the researches on biology and medicine. In this paper, the methods to acquire small molecular compounds are introduced. The enormous progress achieved in the field of combinatorial chemistry, which has allowed the rapid production of a large number of chemically diverse molecules, is an important prerequisite to make chemical libraries available to academic researchers. And the applications of the compounds in early embryo development, cell differentiation, on-set and course of disease are discussed, too. The application of small molecules has an enormous impact on our understanding of cell biology. There are many examples where small molecules, in combination with genetic screens, have facilitated the dissection of complex cellular processes.