Objective To clone platelet-derived growth factor A chain (PDGF-A) gene and insert PDGF-A gene into. Enhanced green fluorescent protein (EGFP) vector and then transformed into dermis-drived mesenchymal stem cells (DMSCs). Methods cDNA clones encoding human PDGF-A gene were isolated from a human hepatoma cell line mRNA by reverse transcription-polymerase chain reaction (RT-PCR). The PCR amplified fragment of PDGF-A gene was cloned into pMD18-T vector. The eukaryotic expression vector pEGFP-N1/PDGF-A was constructed by subcolone PDGF-A gene into pEGFP-N1 vector. PDGF-A gene was transfected into DMSCs with the help of Fugene 6 transfection reagent. Results Full cDNA sequence encoding human PDGF-A gene had been cloned, which sequence was consistent with the reported sequence in GenBank by sequence assaying. Conclusion cDNA sequence encoding human PDGF-A gene was successfully cloned into pEGFP-N1. The transient expression of PDGF-A gene in DMSCs has been realized.

Objective To explore the effect of luteolin on the proliferation of osteosarcoma stem cells.Methods CD133 +osteosarcoma stem cells were separated from MG63 cells by flow cytometer.MTT was used to investigate the effects of luteolin(0,0.01,0.02,0.04 mg/mL)on the proliferation of osteosarcoma stem cells.Western blot was used to detect the levels of Ki67 protein and components of JAK2/STAT3 signal pathway in osteosarcoma stem cells induced.Results After sorting,the content of the CD133 +fraction was enriched up to(87.60 ±5.06)%.MTT assay showed that,compared with the control group,luteolin(0.01,0.02,0.04 mg/mL)inhibited proliferation of CD133 + osteosarcoma stem cells(P <0.05).Western blot also showed that luteolin significantly decreased the level of Ki67 compared with the control group(P<0.05).In addition,the luteolin inhibited the expression of p-JAK2 and p-STAT3 in JAK2/STAT3 signal pathway of CD133 + osteosarcoma stem cells compared with the control group ( P <0.05 ) . Conclusion Luteolin might be a suppressor of osteosarcoma stem cells.

BACKGROUND: Human amniotic membrane (HAM) contains various ingredents such as collagen, glycoprotein,proteoglycan, integrin and laminated body, and so on, and expresses many kinds of growth factors and mRNA-associated proteins. And these ingredents can supply abundant nutriments for cellular proliferation and differentiation, and benefit cells to grow and propagate. Whether or not HAM can load porcine bone marrow-derived mesenchymal stem cells (BMSCs) to well grow on it deserves to be further investigated.OBJECTIVE: To set up a method of tissue engineering of human amniotic membrane loading porcine BMSCs and observe the morphological characteristics of growth and proliferation of BMSCs seeded on HAM.DESIGN: Randomized controlled observation.SETTING: State Key Laboratory of Trauma, Burn and Combined Injury, General Institute of Combined Injuries, Academy of Preventive Medicine, Third Military Medical University of Chinese PLA.MATERIALS: This experiment was carried out in the State Key Laboratory of Trauma, Burn and Combined Injury,General Institute of Combined Injuries, Academy of Preventive Medicine, Third Military Medical University of Chinese PLA between January and November 2003. Three Guizhou minipigs of either gender, aged 2 to 3 months, weighing from 6 to 8 kg, were provided by the Experimental Animal Center, Third Military Medical University of Chinese PLA. Main reagent:ISCOVE'S modified DULBECCO'S medium (IMDM) culture medium (Hyclone, USA); high-quality fetal bovine serum PAA (Germany); haematoxylin (China); Eosin B (Sigma, USA) and OCT embedding medium (USA). Main instruments: BX51 stereoscopic fluorescence microscope (Olympus, JaPan); IX70 inverted fluorescence microscope (Olympus, Japan);cryostat (2700-Frigcut, Germany); myeloid puncture needle (Jiangsu); superclean bench (Sujing Bloc Antai Company);CO2 constant-temperature incubator (QUEUE, USA).METHODS: HAM was prepared as previously described. The BMSCs of Guizhou minipigs isolated and cultured according to method described previously were primarily cultured and passaged, then they were inoculated to the stromal surface of HAM at different densities (0.84×105 cells/cm2,1.54×105 cells/cm2,2.75×105 cells/cm2); The growth and proliferation of BMSCs of different densities were observed under an inverted microscope and scanning electron microscope; BMSCs of the second or the third passages were inoculated on HAM held with tissue-holding device at a density of 1.54×105 cells/cm2, and they were cultured for 18 days at most. The HAM was daily rolled, sliced and stained by HE for observing the growth of BMSCs loaded on HAM under the light, scanning and transmission electron microscopes.MAIN OUTCOME MEASURES: The growth of BMSCs on HAM was examined at different densities and different time points.RESULTS: ① Comparison of growths of BMSCs promoted by different densities of HAM: BMSCs,which were planted on HAM at the density of 0.84×105 cells/cm2 were irregular and scattered under an invert microscope. Distances between BMSCs were biggish. BMSCs seeded on HAM at the density of 1.54×105 cells/cm2 were regular in arrangement and moderate in density, with clear cell outline and good cell activity before 24 hours, and seeded at the density of 2.75×105 cells/cm2 were congested with many nonattached cells and the longer the growing time of the cells was, the more the cellular debris were observed. BMSCs,which were planted on HAM at the density of 0.84×105 cells/cm2 under the scanning electron microscope, scatted on HAM presented in shapes of irregular, long, thin and flat polygon. Their membrane protuberances presented in shapes of thick and thin, and the distances between cells were biggish. BMSCs,which were planted on HAM at the density of 1.54×105 cells/cm2 have similar appearance of their bodies and membrane protuberances, and the membrane protuberances were more compared with the BMSCs planted at the density of 0.84×105 cells/cm2. Their membrane protuberances intercrossed each other, and the margin of some BMSCs overlapped each other. BMSCs planted at the density of 2.75×105 cells/cm2, arraved on HAM crowdedly and overlappedly with many debris. Their membrane protuberances were not obviously. The margin of some BMSCs was overlapped.② Comparisonof growths of BMSCs promoted by HAM at different time points: Under the inverted microscope, the BMSCs adhered quickly to HAM after being incubated for about 30 minutes. All of BMSCs adhered to HAM within 24 hours, and formed monolayer on it within 48 hours, and grew densely on HAM after being cultured for 4 to18 days. Under the light and electron microscopes, HE results revealed that BMSCs adhered tightly and grew on HAM in different arrays, such as emitting, whirlpool or parallel,and their nuclei located in middle, dense in staining, were big and clear. The shapes of BMSCs were comparatively consistent on HAM. HAM loaded with BMSCs grew 4 days, and BMSCs covered HAM completely. The densities of BMSCs on HAM were suitable, and their bodies were large, and presented irregular, long,thin and flat polygon under the scanning electron microscope. The margin of some BMSCs overlapped each other. The protuberances of cellular membrane of BMSCs were abundant in the shapes of thick and thin. Some protuberances intercrossed each other in the shape of net. BMSCs adhered tightly to HAM through these protuberances. HAM loading BMSCs grow 4 days; most of BMSCs grew on HAM in double layers with the shapes of cambiform under the transmission electron microscope, Their nucleoli were clear. The protuberances of cellular membrane of BMSCs, which situated at two sides of nuclei and overlapped each other, were long. Most of chromatins of BMSCs were autosome.Abundant organell such as rough endoplasmic reticulum (RER),mitochondria could be observed in BMSCs.CONCLUSION:HAM is able to promote the proliferation of BMSCs significantly. BMSCs may be cultured on HAM ex vivo.HAM is a good carrier of BMSCs.

Lipidomics coverage improvement is essential for functional lipid and pathway construction.A powerful approach to discovering organism lipidome is to combine various data acquisitions,such as full scan mass spectrometry(full MS),data-dependent acquisition(DDA),and data-independent acquisition(DIA).Caenorhabditis elegans(C.elegans)is a useful model for discovering toxic-induced metabolism,high-throughput drug screening,and a variety of human disease pathways.To determine the lipidome of C.elegans and investigate lipid disruption from the molecular level to the system biology level,we used integrative data acquisition.The methyl-tert-butyl ether method was used to extract L4 stage C.elegans after exposure to triclosan(TCS),perfluorooctanoic acid,and nanopolystyrene(nPS).Full MS,DDA,and DIA integrations were performed to comprehensively profile the C.elegans lipidome by Q-Exactive Plus MS.All annotated lipids were then analyzed using lipid ontology and pathway analysis.We annotated up to 940 lipids from 20 lipid classes involved in various functions and pathways.The biological in-vestigations revealed that when C.elegans were exposed to nPS,lipid droplets were disrupted,whereas plasma membrane-functionalized lipids were likely to be changed in the TCS treatment group.The nPS treatment caused a significant disruption in lipid storage.Triacylglycerol,glycerophospholipid,and ether class lipids were those primarily hindered by toxicants.Finally,toxicant exposure frequently involved numerous lipid-related pathways,including the phosphoinositide 3-kinase/protein kinase B pathway.In conclusion,an integrative data acquisition strategy was used to characterize the C elegans lipidome,providing valuable biological insights into hypothesis generation and validation.

ObjectiveTo establish the quality standard for Fraxini Cortex（Fraxinus chinensis） dispensing granules based on standard decoction， and to provide a basis for the quality control of this dispensing granules. MethodHigh performance liquid chromatography（HPLC） specific chromatograms of 15 batches of Fraxini Cortex（F. chinensis） standard decoctions and 3 batches of Fraxini Cortex（F. chinensis） dispensing granules were established with the mobile phase of 0.1% phosphoric acid aqueous solution（A）-acetonitrile（B） for gradient elution（0-10 min， 12%-15%B； 10-30 min， 15%-32%B） and the detection wavelength of 220 nm. And similarity evaluation， cluster analysis and principal component analysis（PCA） were also carried out. HPLC quantitative analysis of multi-components by single marker（QAMS） was established to determine the contents of the main components in the standard decoctions and dispensing granules. The contents of the corresponding components in Fraxini Cortex（F. chinensis） decoction pieces were also detected， and the transfer rates from decoction pieces to standard decoctions and dispensing granules were calculated. ResultThe similarities between specific chromatograms of 15 batches of Fraxini Cortex（F. chinensis） standard decoctions and 3 batches of Fraxini Cortex（F. chinensis） dispensing granules were all>0.9， and 7 common peaks were identified. The results of cluster analysis and PCA showed that there was some differences in the composition of different batches of standard decoctions， but did not show aggregation of origin. As the standard decoctions， the extract rate was 6.18%-11.62%， the contents of esculin， syringin， fraxin， esculetin， fraxetin， calceolarioside B were 44.92-103.51， 1.36-11.87， 33.26-90.73， 4.63-29.75， 2.40-16.86， 2.49-17.35 mg·g^-1， and the transfer rates from decoction pieces to standard decoction were 25.21%-42.54%， 52.57%-88.84%， 43.43%-79.45%， 49.15%-88.27%， 49.22%-72.69%， 27.66%-47.67%， respectively. The extract rates of Fraxini Cortex（F. chinensis） dispensing granules were 10.4%-10.7%， the transfer rates of the above six components from decoction pieces to dispensing granules were 42.76%-43.17%， 80.01%-80.90%， 59.59%-59.88%， 51.35%-52.67%， 60.50%-60.93%， 37.98%-38.37%， respectively， which were generally consistent with the transfer rates from decoction pieces to standard decoctions. ConclusionThe established quality control standard of Fraxini Cortex（F. chinensis） dispensing granules based on standard decoctions is reasonable and reliable， which can provide reference for the quality control and process research of this dispensing granules.