Chorionic Villi ; metabolism ; pathology ; ultrastructure ; Diabetes, Gestational ; metabolism ; pathology ; Female ; Glucose ; metabolism ; Glycogen ; metabolism ; Humans ; Lipids ; analysis ; Microscopy, Electron, Scanning ; Microscopy, Electron, Transmission ; Placenta ; metabolism ; pathology ; ultrastructure ; Pregnancy

Objective To observe the effect of DPC4 gene transfection on the chemotherapy sensitivity of pancreatic carcinoma cells. Methods The human DPC4 complementary DNA was subcloned to the retroviral vector pLXSN to obtain recombinant pLXSN/DPC4 with direct inserting potential. The daughter cell BxPC-3/DPC4 which had DPC4 stable expression was acquired after the pancreatic carcinoma BxPC-3 cells had been transfected with pLXSN/DPC4. The sensitivity of the carcinoma cells for 5-Fu and gemcitabine was observed. Meanwhile, the mRNA level of Mdr-1 and Chk1was detected by semi-quantity PCR assay. Results The 50% inhibiting concentrations (IC50)of 5-Fuand gemcitabin4e for BxPC-3 (culturing for 72 h) were rather lower than those of BxPC-3/pLXSN and BxPC-3/-cells. Moreover, the semi-quantity PCR assay revealed that the mRNA level of Mdr-1 and Chk1 was down-regulated. These findings indicated that pLXSN/DPC4 vector, 5-Fu and gemcitabine could inhibit the growth of pancreatic cancer cells. The combined therapy with pLXSN/DPC4 vector and chemotherapeutic drugs could further inhibit the growth of cancer cells. Conclusion The DPC4 gene transfection could enhance the sensitivity of pancreatic cells to chemotherapy, which may be realized through the down-regulation of Mdr-1 and Chk1 gene expression.

AlM:To explore the primary culture conditions for four kinds of lens epithelial cells ( LECs) of rat, rabbit, dog, and human, and measure their growth characteristics.METHODS:The lens capsule or anterior capsular tissue of rat, rabbit, dog and patient were removed by different methods, and they were cut into tiny pieces for primary culture by modified tissue adherent method. The morphological features of four kinds of LECs were observed under an inverted microscope.RESULTS: Four kinds of LECs of rat, rabbit, dog and human could be cultured primarily by tissue adherent method. With the evolution of tissue source, the adherent capacity of LECs gradually strengthened, cells form were changed from irregular polygon to oval, nucleus rounded and cytoplasm enriched gradually. Four kinds of LECs had fibrotic changes after several passages.CONCLUSlON: LECs of rat, rabbit, dog and human can be primarily cultured. This method lays the foundation for the mechanism research of caratact and related fields on the cellular and molecular levels.

Continuing medical education refers to the completion of basic medical education for inservice education,which is to guarantee the sustainable development of physicians in clinical and scientific research ability,and is the essential means to safeguard and improve the level of medical treatment.Traditional continuing medical education is given priority to the form of regularly organize workshops,so it has some limitations to oral and maxillofacial surgery.MOOC teaching is a kind of large-scale open new online teaching mode.This study provides an overview of the MOOC development,characteristics and development situation in the medical teaching.The necessity and feasibility of MOOC based teaching protocol in oral and maxillofacial surgery continuing medical education has been discussed.And curriculum transformation,construction of education model and possible challenges have also been analyzed and discussed in this paper.

Objective To observe the inhibitory effect of DPC4 gene on growth of pancreatic carcinoma in vitro. Methods The human DPC4 cDNA was subcloned to the retroviral vector pLXSN and then packaged with GP+E86 and PA317 packaging cells respectively. AntiG418 clones were acquired and named as PA317/ pLXSN DPC4+ cells. The DPC4 gene was restored to the human pancreatic cancer cell line BxPC-3 by the infection of the pLXSN/DPC4 and then had a stable expression after antiG418 selection, which was demonstrated by RT-PCR and Western blot. The inhibitory action of DPC4 gene expression on growth of these daughter cells was observed.Results DPC4/Smad4 gene integration in GP+E86、PA317/ pLXSN DPC4+ cells was detected by polymerase chain reaction. The BxPC-3 cells, which were null for DPC4, had stable expression of DPC4 after the infection of the pLXSN/DPC4. The expression of DPC4 gene was able to inhibit the growth of these cancer cells in vitro and downregulate the VEGF mRNA level.Conclusions This study suggested that there can be marked inhibition of growth and angiogenetic ability of pancreatic cancer cells after infection by retrovirus vector containing DPC4.

Student preparation for laboratory sessions is the first step of conducting laboratory experiments. It makes students maximize use of laboratory time and efficiently perform laboratory exercises in open labs. In view of teaching features and requirements of Microbiology experiment, we designed and developed ‘Online Student Preparation and Management System of Microbiology Experiment’, which integrated func- tions of student preparation for laboratory sessions and teacher management. In the system each experiment consists of six successive parts, viz., learning objectives, principle, materials and equipments, procedure video, manipulation simulation and online quiz. Teaching practices showed that the application of the system enhanced the preparing quality and makes the management of the experiment teaching more normalized and efficient. It was an effective measure in improving experimental teaching of Microbiology.

Objective: To detect the bioavailability of 21 types of perfluorochemicals (PFCs) in rat liver and to examine the effect of protein powder. Methods: Twenty-four rats of the SD strain were randomly divided into the control group, the model group, and the protein powder group. Twenty-one types of PFCs were mixed at an equal concentration of 10 ng/mL, and rats in the model group and the protein powder group were given by oral administration of PFCs mixtures at a daily dose of 5 mL/kg. Rats in the protein powder group were given protein powder by gavage at a dose of 15 mL/kg, while animals in the model and control groups were given deionized water at doses of 15 and 20 mL/kg for 28 successive days. The PFCs contents were quantified in rat liver using ultra-high performance liquid chromatography-electrospray tandem mass spectrometry (UPLC-MS/MS), and the bioavailability was estimated. Results: There were no significant differences in rat body weight or liver/body weight ratio in the control, model and protein powder groups (P>0.05). There were no significant differences in the bioavailability of perfluoroalkylated carboxylic acid (PFCA) or sulfonate (PFSA) in the liver of female and male rats between the protein powder group and the model group (P>0.05), and the gross bioavailability of PFCA (t=-22.266, P<0.001) and PFSA (t=-34.312, P<0.001) was significantly higher in the liver of male rats than in that of female rats in the model group, and the bioavailability of PFCA and PFSA increased followed by a reduction in rat livers with the increase of carbon chain length in the model group. In the model group, the highest bioavailability was measured in perfluorododecanoic acid (PFDoA) and sodium perfluorooctylsulfonate (L-PFOS) in the female rat liver [(36.06±2.93)% and (37.11±1.73)%], and the highest bioavailability was measured in perfluorononanoic acid (PFNA) and L-PFOS in the female rat liver [(61.02±2.16)% and (87.16±3.29)%]. Conclusions The bioavailability of PFCs correlates with the carbon chain length and animal gender in rat livers, and protein powder poses no clear-cut effects on the bioavailability of 21 types of PFCs in rat livers.

Objective: To explore the effects of protein powder on the bioavailability of perfluoroalkyl substances (PFASs) in blood and kidneys of rats and renal function change. Methods: Twenty-four rats of the SD strain were randomly divided into the negative control group, PFASs group and protein powder group, with 8 rats (half males and half females) in each group. PFASs included 13 perfluorocarboxylic acids (PFCAs) and 8 perfluorosulfonic acids (PFSAs), and the mixture was used as a test subject for intervention. The rats in the negative control group were given deionized water at doses of 20 mL/kg·bw, in the PFASs group were given 5 mL/kg·bw of PFASs mixtures and 15 mL/kg·bw of deionized water, and in the protein powder group were given 5 mL/kg·bw of PFASs mixtures and 15 mL/kg·bw of protein powder (0.258 g/mL). After intervention for 28 successive days, body weight and kidney mass were weighed, and the kidney volume index was calculated. Serum creatinine and blood urea nitrogen were detected by an automatic biochemical analyzer. The PFCAs, PFSAs and PFASs contents were quantified in blood and kidney using ultra-high performance liquid chromatography-electrospray tandem mass spectrometry, and the bioavailability was estimated. Results: There was no significant differences in kidney mass, kidney volume index, serum creatinine and blood urea nitrogen among the negative control group, PFASs group and protein powder group (all P>0.05). The bioavailability of blood PFCAs, PFSAs and PFASs in the protein powder group was not significantly different from the PFASs group (all P>0.05). Compared with the PFASs group, the bioavailability of PFCAs, PFSAs and PFASs were significantly increased in kidneys of male rats in the protein powder group (all P<0.05), while were not significant different in those of female rats (all P>0.05). Conclusion Protein powder at the dose of this study can significantly improve the bioavailability of PFASs in kidneys of male rats, while there no obvious effects on the bioavailability of blood PFASs and renal function.

Angiotensin I ; metabolism ; Animals ; Insulin-Like Growth Factor Binding Protein 2 ; metabolism ; Liver ; metabolism ; pathology ; Liver Cirrhosis, Experimental ; metabolism ; pathology ; Peptide Fragments ; metabolism ; Peptidyl-Dipeptidase A ; metabolism ; Rats ; Rats, Wistar

Female ; Humans ; Hyperkalemia ; therapy ; Infant, Newborn ; Male ; Peritoneal Dialysis ; instrumentation