Effect of tumor necrosis factor-α on the proliferation and multi-directional differentiation of stem cells from rat apical papilla / 重庆医学

Objective To evaluate the biological effect of tumor necrosis factor-α(TNF-α) on the proliferation and multi-directional differentiation of stem cells from rat apical papilla(SCAP).Methods SCAP was extracted by combining enzyme digestion method with tissue block method.The cells were divided into control group(TNF-α 0 ng/mL) and experimental group(TNF-α 5,10,20,50 ng/mL).The ability of proliferation of SCAP was measured by MTT method.The ability of osteogenic/dentinogenic differentiation of SCAP was measured by alizarin red staining and quantitative real-time PCR.The ability of adipogenic of SCAP was measured by oil red O staining.The expression of vascular related genes of SCAP was measured by quantitative real-time PCR.Results SCAP was consistent with the characteristics of mesenchymal stem cells and possessed the ability of multi-directional differentiation.The MTT results showed that experimental group promoted the proliferation of SCAP in comparison with the control group.The difference was statistically significant(P<0.05),and 10 ng/mL was the optimum concentration.The results of alizarin red staining showed that with the increase of the concentration of TNF-α,the mineralized nodules in the experimental group gradually became smaller,and the number of the formation decreased gradually.The results of quantitative real-time PCR showed that the expression of OC,DMP-1 and DSPP in the experimental group was significantly lower than that of the control group at 3 and 7 days,in which the expression of OC was statistically significant different(P<0.05);at 14 days,the expression of OC,DMP-1 in the experimental group was significantly lower than that of the control group(P<0.05).The result of Oil red O staining showed that with the increase of the concentration of TNF-α,the lipid droplets formation in the experimental group gradually decreased.The result of quantitative real-time PCR showed that the expression of ANGPT1,VEGFA,PECAM-1 in the experimental group was significantly lower than that of the control group(P<0.05).Conclusion TNF-α might promote the proliferation and inhibit the multi-directional differentiation of SCAP.

Improvement and Optimization of the Quality Standard for Shenghua Pills / 中国药师

Objective:To optimize the extraction process of Shenghua pills and establish the best method for the TLC identification and the HPLC determination of effective components to provide an effective method and reliable basis for the quantitative and qualitative analysis of Shenghua pills. Methods:TLC was used for the identification of angelica,Rhizoma Chuanxiong and Licorice. Ferulic acid was determined by HPLC,and the separation was performed on an Agilent 5 TC- C18(2)(250 mm×4.6 mm,5 μm)column using a mixture of methanol-5% acetic acid solution(25 :75) as the mobile phase with the detection wavelength at 322 nm. The flow rate was 1.0 ml·min-1and the column temperature was room temperature. Results:Angelica sinensis(Oliv.) Diels.,Ligusticum chuanxiong Hort. and Glycyrrhiza uralensis Fisch. could be detected by TLC. Ferulic acid was linear within the range of 1.28-20.51 μg·ml-1(r=0.999 9). The average recovery was 98.47% with the RSD of 0.36% (n=6).Conclusion:The method can be used to efficiently extract the active components in Shenghua pills. The method is feasible,accurate and reproducible. It can be used for the quality con-trol of Shenghua pills.

Practice and thinking for developing professional directors of public hospitals / 中华医院管理杂志

The paper described the professional approach of Shanghai Hospital Development Center(SHDC)in developing a professional team of public hospital directors by such means as operation and management-autonomy,fixed tenures system,performance appraisal,part-time job control and income distribution. Recommendations raised include an organic unity of management functions of investors and power of management of the directors to motivate them in their management;building a comprehensive investor management system and strict cadre management mechanism to enhance supervision of the directors.

Effects of Ca2+ on salicylic-acid induced biosynthesis of salvianolic acid B in young seedlings of Salvia miltiorrhiza Bunge / 生物工程学报

In order to study the effects of Ca2+ in the biosynthesis of salvianolic acid B (Sal B) induced by salicylic acid (SA) in the young seedlings of Salvia miltiorrhiza, we used confocal laser scanning microscopy and high performance liquid chromatography to measure the change of relative fluorescence intensity of Ca2+ and the contents of Sal B induced by SA before and after the application of extracellular calcium channel inhibitors (VP and LaCl3), intracellular calcium channel inhibitor (LiCl), as well as intracellular calmodulin antagonist (TFP). SA could induce the calcium burst, and the Ca2+ peak could last to 2-3 min in the guard cells of S. miltiorrhiza, which prompted the biosynthesis of Sal B after the Ca2+ burst. Both Vp or LaCl3, and LiCl or TFP could inhibit the burst of Ca2+ and the biosynthesis of Sal B. The above results demonstrated that Ca2+ from the extracellular and the intracellular calcium store regulate the biosynthesis of Sal B elicited by salicylic acid in S. miltiorrhiz young seedlings.

Effects of salicylic acid on synthesis of rosmarinic acid and related enzymes in the suspension cultures of Salvia miltiorrhiza / 生物工程学报

Rosmarinic acid (RA), a phenolic acid, is one of the important secondary metabolites produced in Salvia miltiorrhiza. To observe the influence of salicylic acid (SA), an elicitor, on the synthesis of RA and related enzymes, we treated the cell suspension cultures of S. miltiorrhiza with SA and L-a-aminooxy-beta-phenylpropionic acid (AOPP), a competitive inhibitor of tyrosine aminotransferase (TAT). Under this condition, the activities of related enzymes, such as phenylalanine ammonia-lyase and TAT were traced and assayed; the accumulative amount of RA was measured. The results showed that the PAL activity reached the peak at 4 h, 124% higher than that of the control, and the content of RA reached its maximum ((5.914 +/- 0.296) mg/g dry weight) at 8 h, after treated by 6.25 mg/L SA on day 6 of the suspension culture. The results of treatment with 0.1 micromol/L AOPP showed that AOPP affected little on the TAT activity, while the PAL activity was significantly influenced, with 44% lower than that of the control at 6 h. Meanwhile, the reduced accumulation of RA ((4.709 +/- 0.204) mg/g dry weight) paralleled with the decrease in PAL activity. The co-treatment by 0.1 micromol/L AOPP and 6.25 mg/L SA relieved the restriction imposed by AOPP on PAL, and made the cell cultures accumulate more RA than sole treatment with AOPP, indicated that SA induced the accumulation of RA in suspension cell culture of S. miltiorrhiza, and the rate-limiting effect of PAL was stronger than TAT.

The Problems and Countermeasures in Medical Moral Construction Engineering at Present / 中国医学伦理学

Under market economy, It is of important significance to realize correctly the double natures of health service which affect medical morals in positive and negative, and to find out the relationship between the natures. The countermeasures to construct medical moral engineering are as followings:to Lay-out integrally, develop in every sides and carry out in several steps,to grasp the guide of value and strengthen the principles of medical morals,and to arise the degree of taking part in and have the aid of propagating medium and social opinion.