ABSTRACT
Objective To determine the content of total flavonoids and luteolin from Pteris multifida Poir. Methods The content of total flavonoids was determined by gradient elution of macroporous resin D101 and ultraviolet spectrophotometry. The content of luteolin was determined by HPLC. The analysis was performed on a RP-C18 column(4.6 mm×250 mm, 5 μm) with aceconitrile-0.2% phosphoric acid (35:65) as the mobile phase at a flow rate of 1.0 ml/min, and 30 ℃ temperature. Results The detection of wave length was set at 349 nm. The content of luteolin was 0.015%, 0.019%, 0.016%, and the content of total flavonoids was 0.015%, 0.019%, 0.016%, respectively. Conclusions The method is suitable for the determination of flavonoids componets from Pteris multifida Poir.
ABSTRACT
Objective To investigate the effects of interferon-gamma (IFN-γ) on migration,invasion and vasculogenic mimicry (VM) formation of human melanoma cell line MUM-2B. Methods MUM-2B cells were divided into three groups, control group (10%FBS in DMEM), treatment group1 (10μg/L IFN-γ) and treatment group2 (100μg/L IFN-γ). Different concentrations of IFN-γ were added in the culture medium of MUM-2B cells. Wound-healing assay and matrigel invasion assay were performed to examine the migration and invasion ability of MUM-2B cells. Three-D culture was used to observe the VM formation. The expression of vascular endothelial growth factor (VEGF) of MUM-2B cells was detected by Western blot assay. Results The result of wound-healing assay showed that the migration distance of cells was decreased in treatment groups compared with that of control group. The migration distance of cells was decreased in treatment group 2 compared with that of treatment group 1(P＜0.05). The result of matrigel invasion assay showed that the number of invaded cells was decreased in treatment groups compared with that of control group, and which was significantly decreased in treatment group2 than that of treatment group1 (P＜0.05). The result of 3-D culture showed that cells in control group can form typical VM tube-like structures, whereas cells in treatment groups cannot. Western blot assay showed that the expression of VEGF protein was significantly decreased in treatment groups compared with that of control group, and the expression of VEGF protein was significantly decreased in treatment group2 than that of treatment group 1(P＜0.05). Conclusion These data suggest that IFN-γinhibits migration and invasion of MUM-2B cells, and inhibits VM formation by down regulating VEGF expression in vitro.
ABSTRACT
Objective: To build a mouse tumor model with a manufactured surgical wound representing acute inflammation, and to evaluate the relationship between acute inflammation or wound healing and the process of tumor growth. Then to observe the impact of IFN-γ/TGF-β on tumor growth. Methods: Male C57BL mice of six weeks were used and divided into the experiment group and the control group. The B16F10 mela-noma cell suspension was injected into the left groin area of each mouse. A wound measured 1 cm in diame-ter was built on the opposite side of bodies in the experiment group when tumor volume was about 0.5 cm~3.The expression of IFN-γ/TGF-β in blood serum and tumor tissues were examined by ELISA. In order to fur-ther confirm the effect of TGF-β on tumor growth, another 16 mice models with melanoma were established and 8 of them received IFN-γ injection (the experiment group). Results: When acute inflammation had influenc-es on tumor, a two-phase development was presented. In the early phase, the growth of tumor in the mice with wound was slower than that in the control group. In the early phase, the release of IFN-γ was higher and the release of TGF-β was lower in the experiment group. In the later phase, the growth of tumor in the mice with wound was similar to that in the controls and the release of TGF-β was higher. In vivo experiment con- firmed the above results. In the early phase, the release of TGF-β was not significantly different between the experiment group and the control group (P>0.05). In the later phase, the release of TGF-β in the experiment group was higher than that in the control group (P<0.05). Conclusion: In the early phase of acute inflamma-tion, inhibitory effects of IFN-y on tumor growth were presented. In the later phase, the inhibited tumor was re-sistant to IFN-γ through the release of TGF-β to balance the effect of inflammatory factors on tumor cells.
ABSTRACT
The article demonstrates three characters of health service system in community and the countryside: equalitarianism,universality and suitability,and puts forward major functions: strengthening propaganda,universalizing life long education,making prevention and health care education and producing psychologic health education.
ABSTRACT
By mean of reviewing surgery development history,the article narrates how crucial affairs promote surgery,clarifies that interpermeation and intersynthesis among various subjects are the conspicuous features of the contemporary medicine and discusses the development tendency of surgery in 21st based on comprehensive characteristic of medicine.