Effects of Acorus tatarinowii Schott and its active component -5- hydroxymethylfurfural on ERK/CREB signal in hippocampus of exercise-induced fatigue rats / 中国应用生理学杂志

OBJECTIVE@#To investigate the effects of Acorus tatarinowii Schott and its active component 5- hydroxymethyl furfural (HMF) on learning and memory and ERK/CREB signal in hippocampus of rats with exercise-induced fatigue.@*METHODS@#SD rats were randomly divided into normal group (A), exercise group (B), exercise + HMF low, middle and high dose treatment group (C, D, E), exercise + acorus tatarinowii Schott low, middle and high dose treatment group (F, G, H), with ten rats in each group. The rats in group C, D and E were treated with HMF at the doses of 0.10, 1.00 and 3.00 mg. kg by ig. The rats in group F, G and H were treated with the extracts of Acorus tatarinowii Schott at the doses of 0.12, 1.20 and 4.80 g. kg by ig. Learning and memory of rats were tested by the method of water maze experiment, and the expression levels of p-ERK1/2 and p-CREB protein in hippocampus of rats were tested by the method of Western blot in the end of the experiment.@*RESULTS@#The escape latencies of E and H groups were lower than those of groups B, C, D, F and G; and the numbers of plateau crossing were more than those of groups B, C, D, F and G and the expression levels of p-ERK1/2, p-CREB protein were higher than those of groups B, C, D, F and G , respectively(P ＜ 0.01). There was no significant difference in the above indexes among groups A, E and H(P＞0.05) except that the expression levels of p-ERK2 protein in group E were lower than those in group A and H (P＜0.05).@*CONCLUSION@#Acorus tatarinowii and its active component- HMF can improve the learning and memory of rats with exercise-induced fatigue, and the mechanism is related to the up-regulation of ERK / CREB signal in hippocampus of rats with exercise-induced fatigue.

Preparation and preliminary evaluation of chitosan composite KGF-2 mutant thermal sensitive dressing / 军事医学

Objective To develop chitosan composite keratinocyte growth factor-2 mutant(KGF-2M)temperature-sen-sitive dressing and evaluate its physicochemical properties and dynamic release rule were used.Methods Chitosan, chi-tosan quaternary ammonium salt,β-glycerophosphate and other adjuvant materials to configure different formulations which were compounded with KGF-2M in order to develop temperature-sensitive dressing.Gelling time, temperature,the release rate of KGF-2M and other indicators were measured to analyze the physical and chemical properties of the temperature -sen-sitive dressing.Results Chitosan-KGF-2M composite dressing with temperature-sensitive properties was obtained by opti-mizing the formulation components of chitosan and related adjuvant materials.When the liquid dressing was above 35℃,it could be converted from liquid to solid gelatin within 10 minutes.The compound KGF-2M released from the gel was more than 98%at 4 h,and its bioactivity remained stable.Conclusion The thermo-sensitive gel has the characteristics of good conformability,moisturizing(moisture),isolation,wound healing,and a controlled release effect,which has great potential in wartime for wound repair.

Relation between ionization and the expressions of HIF-1α and VEGF in anoxia condition / 肿瘤

Objective: To investigate the effect of ionization on the expression of HIF-1 α and VEGF in anoxia condition, in order to search an effective method for improving the radiosensitivity. Methods: HepG2 hepatoma carcinoma cells were divided into four groups: the control group; the hypoxia group; the radiation group; the hypoxia and radiation group. The cell apoptosis was detected by fluorescence microscope. The cell viability was analyzed by MTY method. And we measured the expressions of HIF-1 α mRNA and VEGF mRNA by RT-PCR. Results: Cell apoptosis: no apoptosis was observed in the control group; few apoptosis occurred in the hypoxia group; bulk apoptosis was observed in the radiation group; less apoptosis occurred in the hypoxia and radiation group than that in the hypoxia group. The order of surviving fraction was the control group > the hypoxic group > the hypoxia plus radiation group > the radiation group; The order of the expression of HIF-1 α mRNA: the hypoxia plus radiation group > the hypoxic group > the radiation group, no significant difference was observed between the radiation group and the control group; The order of the expression of VEGF mRNA: the hypoxia plus radiation group > the hypoxic group > the radiation group > the control group. Conclusion: The expression of HIF-1α induced by hypoxia can prevent hepatoma cells from the damage of radiation. The HIF-1 α decreases the radiosensitivity through inducing VEGF expression in the HepG2 cell line.

The specific killing of human melanoma cells by replication selective adenovirus / 中华肿瘤杂志

<p><b>OBJECTIVE</b>To construct replication selective adenovirus AdhepE1 targeting human melanoma and observe its specific killing of human melanoma cells in vitro.</p><p><b>METHODS</b>Adenovirus E1 region, the murine tyrosinase promoter and enhancer DNA sequences were acquired respectively by PCR cloning. The shuttle plasmid of replication-selective adenovirus targeting human melanoma was constructed by DNA recombination. Replication-selective adenovirus AdhepE1 was generated by homologous recombination. The human melanoma cell line SK-Mel-1 and hepatocellular carcinoma cell line HepG2 were attacked separately by lower dose of AdhepE1. Change of cell morphology was observed and the surviving cells were calculated. The expression of E1A was assayed by RT-PCR to verify the specific-replication of AdhepE1.</p><p><b>RESULTS</b>Replication selective adenovirus AdhepE1 targeting human melanoma was acquired by PCR. Human melanoma cell line SK-Mel-1 was sensitive to oncolytic killing of AdhepE1 whereas HepG2 was little responsive. The results of RT-PCR suggested that AdhepE1 replicated specifically in human melanoma cells.</p><p><b>CONCLUSION</b>AdhepE1 can selectively kill human melanoma cells.</p>