The repellent effect of tea tree oil emulsion on leeches / 药学学报

Leech bites usually lead to more bleeding, and dermal tissue is damaged to form lifelong scars. If leeches enter the body cavity, it will be more dangerous. Therefore, there is an urgent need to develop effective repellents. In this study, oil in water (O/W) emulsion of tea tree oil was prepared with tea tree oil as the main ingredient, and konjac glucomannan (KGM), ethyl cellulose (EC) as the main excipients. The filter-paper ring method and repellent test in water were used to evaluate the repellent effects on leeches. The animal experiments were approved by the Ethics Committee of Academy of Military Medical Sciences and were conducted in accordance with relevant guidelines and regulations. The activities of acetylcholinesterase (AchE), glutathione S-transferase (GST) and carboxylesterase (CarE) in vivo were measured to clarify the repellent mechanisms. The results showed that a uniform and stable tea tree oil emulsion was successfully prepared, which has excellent hydrophilicity and can effectively repel leeches. The tea tree oil emulsion has a good repellent effect on leeches, which can avoid the volatilization of tea tree oil and prolong the effective repelling time. The novel formulation of tea tree oil provides a new idea for repelling effects with long time and high efficiency based on similar essential oil.

Anti-tumor nanoscale drug delivery systems based on photodynamic therapy / 药学学报

Photodynamic therapy (PDT) is a therapeutic strategy by which photosensitizers are excited by specific light irradiation to produce singlet oxygen for killing the surrounding cells. The advantages of PDT include weak invasion, slight side effect, and low resistance. The advantages of nanoscale drug delivery systems (DDS) include tumor-targeting, sustained release, and environmental-sensitivity. The combination of PDT and nanoscale DDS would likely lead to tumor targeting of photosensitizers and enhance their antitumor effectiveness. This review discusses the mechanism of PDT, photosensitizer-loaded nanoscale formulations, the combination of PDT and other antitumor therapies, and summarizes the applications and prospects of anti-tumor nanoscale DDS based on PDT. This review is a useful reference for its clinical application.

Study on transformation rules of terrestrosin D in course of Tribuli Fructus stir-frying based on simulated processing technology / 中国中药杂志

The contents of terrestrosin D and hecogenin from Tribuli Fructus were determined before and after stir-frying. The results showed that the content of terrestrosin D was decreased significantly,and the content of hecogenin was increased significantly after such processing. In order to verify the inference that terrestrosin D was converted to hecogenin by stir-frying,the quantitative variation rules of terrestrosin D and hecogenin were studied by simulated processing technology,and the simulated processing product of terrestrosin D was qualitatively characterized by ultra performance liquid chromatography/time of flight mass spectrometry( UPLC-TOF/MS) to clarify its transformation process during stir-frying. The results showed that the content of terrestrosin D was decreased significantly at first and then a platform stage appeared with the prolongation of processing time at a certain temperature. Raising the stir-frying temperature could further decrease the content of terrestrosin D and delay the time that the platform stage appeared. When the processing was simulated at higher temperatures( 220 ℃ and 240 ℃),the content of hecogenin was increased gradually with the increase of processing temperature and the prolongation of processing time. In the process of stir-frying,the deglycosylation reaction of terrestrosin D to hecogenin was not completed in one step. The deglycosylation reaction occurred first at the end of the sugar chain,and then other glycosyl units in the sugar chain were sequentially removed from the outside to the inside to finally form the hecogenin. This study provides a basis for further revealing the detoxification mechanism of stir-fried Tribuli Fructus.

Factors influencing the prognosis of patients with multiple intracranial aneurysms in subarachnoid hemorrhage / 中华神经医学杂志

Objective To explore the factors that may influence the prognosis of patients with multiple intracranial aneurysms (MIA) in subarachnoid hemorrhage (SAH). Methods A retrospective review was performed to analyze the medical records of 93 patients who had been managed in our department from January 2000 through January 2011 for MIA in SAH. Results The single factor analysis showed that the gender, preoperative Hunt-Hess grade, treatment protocol and a history of hypertension had significant influences on the prognosis of the patients (P＜0.05). The multiple linear regression analysis revealed that the preoperative Hunt-Hess grade and treatment protocol were 2 independent risk factors of the prognosis of the patients (P＜0.05). Conclusions The preoperative Hunt-Hess grade and the treatment protocol appear to be related to the prognosis of patients with MIA in SAH. Early diagnosis and treatment of ruptured aneurysms, as well as careful observation and proper intervention ofunruptured aneurysms,can result in a satisfactory prognosis in most patients with MIA in SAH.

Effect of all-trans retinoic acid on expressions of vascular endothelial growth factor and basic fibroblast growth factor in glioma stem cells / 中华神经医学杂志

Objective To investigate the effect of all-trans retinoic acid (ATRA) on expressions of vascular endothelial growth factor (VEGF) and basic fibroblast growth factor (bFGF) in glioma stem cells (GSCs). Methods GSCs were isolated from human glioblastoma cell line U87 and identified by detecting the expressions of CD133 and nestin with immunofluorescence staining. The obtained GSCs were divided into control group,empty vector group (cultured with dimethyl sulfoxide [DMSO]) and ATRA treatment group (cultured with 10 nmool/L ATRA).After 10 d of differentiation; the proliferation of the treated GSCs was evaluated using CCK8 assay; the expressions of glial fibrillary acidic protein (GFAP),β-tubulin Ⅲ and galactoeerebroside (GralC) in the cells were detected by immunofluorescence.VEGF and bFGF levels in cultured supernatant were measured by ELISA; the mRNA expressions of VEGF and bFGF were detected by RT-PCR. Results The target antibodies of neural stem cells (NSCs), CD133 and nestin,positively expressed in the GSCs; differentiated GSCs can differentiate several kinds of homologous daughter cells,which expressed the cell markers of astrocytes,neurons and oligodendrocytes: GFAP, β-tubulin LⅢ and GalC, respectively. The percentage of GFAP-positive differentiated GSC s in the ATRA treatment group was significantly higher as compared with that in the other 2 groups after 10 d of differentiation (P＜0.05); the speed of proliferation of GSCs in ATRA treatment group was obviously slower than that in the other 2 groups 3-7 d after differentiation (P＜0.05).The VEGF and bFGF levels and the mRNA expression levels of VEGF and bFGF in GSCs of the ATRA treatment group 24 h after differentiation were also significantly lower than those in the other 2 groups (P＜0.05). Conclusion ATRA can induce the differentiation of GSCs and inhibit its proliferation.It may exerts its anti-glioblastoma effect through the VEGF and bFGF signaling pathways.

Blockage of transforming growth factor-β signaling pathway inhibits vasculogenic mimicry in gliomas / 中华神经医学杂志

Objective To study the effect of transforming growth factor-β (TGF-β) signaling pathway blockage on vasculogenic mimicry (VM) in gliomas and explore its possible mechanism.Methods Three-dimentional culture was performed on the glioma cell lines U251 and SHG44; the effects of U251 culture supematant and TGF-β on VM formation of SHG44 cells were observed; the capability of VM formation of U251 and SHG44 cells after being treated with 0 μg/mL (PBS group),15 μg/mL TGF-β neutralizing antibody (Ab15 group) and 30 μg/mL TGF-β neutralizing antibody (Ab30 group) was evaluated.ELISA was used to detect the concentrations of vascular endothelial growth factor (VEGF) and platelet-derived growth factor (PDGF) in the supematant of U251 cells from the blank group,PBS group,Ab 15 group and Ab30 group and the concentrations of VEGF and PDGF in the supernatant of SHG44 cells from the blank group,TGF-β treatment group,PBS group,Ab15 group and Ab30 group.Results VM was formed in the U251 cells while not in the SHG44 cells during the three-dimentional culture; SHG44 cells could only gather into colonies of different sizes.U251 culture supernatant could induce SHG44 cells to form VM,enjoying the most obvious effect at 24-48 h of culture; TGF-β could not induce SHG44 cells to form VM.The number of U251 cells annulation in PBS group,Ab15 group and Ab30 group decreased in sequence with significant difference (P＜0.05).The number of U251 cells armulation in SHG44 cells cultured in U251 culture supematant from the PBS group,Ab15 group and Ab30 group decreased in sequence after being added TGF-β antibody with significant difference (P＜0.05).As compared with that in the blank group and PBS group,significant decrease of VEGF and PDGF concentrations in the U251 cells from Ab15 group and Ab30 group was noted (P＜0.05); as compared with that in the blank group and TGF-β treatment group,significant increase of VEGF and PDGF concentrations in the SHG44 cells from PBS group,Ab15 group and Ab30 group was noted.Conclusion Blockage of TGF-β signaling pathways inhibits VM in glioma,and it maybe probably due to the decrease of VEGF and PDGF expressions..

Nursing of canal obturation during root canal therapy / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To explore the nursing methods during canal obturation in order to improve efficiency and quality of root canal therapy.</p><p><b>METHODS</b>112 teeth treated by complete root canal preparation were chosen to fill the root canal, and the main points of nursing during canal obturation were summarized.</p><p><b>RESULTS</b>All of 112 teeth nursed strictly during canal obturation obtained satisfactory efficiency. No one failed after root canal therapy.</p><p><b>CONCLUSION</b>The main points of nursing during canal obturation are the aseptic technique, skilled coordination, instrument management, communication between nurses and patients.</p>