Changes of Alternative Splice Variant of the SRSF12 by Cisplatin in Multiple Cells / 昆明医科大学学报

Objective To detect the changes of mRNA isoforms in multiple cancer cell lines with dose of cisplatin. Methods Total RNA of the cells treated by cisplatin were abstracted 24 h after the treatment. mRNA isoforms of SRSF12 gene were detected by semiquantitative RT-PCR. The ratios of mRNA isoforms were analyzed by gel image software and statistical analysis. Results Under the cisplatin treatment, 2 mRNA isoforms of SRSF12 were detected in five cells except Caski cells,their ratios and relative mRNA levels were changed. With the increase of dose of cisplatin, the ratio of isoform-a was slightly increased; but the ratio of isoform-b was different, the changes were not obvious in the A549 and 293FT cells, the weaker expression was expressed in the H1299 and C33A cells, and the two isoforms were gradually weakening in the Siha cells. Conclution Under the cisplatin treatment in multiple cancer cells, the expression of SRSF12 shows tissue-specific and cell type-specific patterns .

Structural improvement and analysis of a novel endoscopic succession closing device / 医用生物力学

Objective By developing a novel endoscopic succession closing device to overcome the shortcomings of existing devices that cannot deploy several clips at one time,to perform structural analysis on different clamp structures and to validate their performances in tissue closure through finite element analysis.Metbods Comparative analyses of 3 clamp structures,namely,the aligning tooth structure (original,clamp A),the staggered tooth structure (clamp B),a combination structure with page break angle and staggered tooth (clamp C),were performed to analyze pressure and its distribution on tissues when clamping the stomach wall.Displacement of 7.5 mm was then applied on the clamps to simulate the effect from operating procedures of the device and tissue kick-back.Results The maximum stresses of the clamp A and B were located on the first pair of teeth which was closest to the rotating shaft,with the stress of 10.39 kPa and 10.11 kPa,respectively.The maximum stress (11.35 kPa) of the clamp C was located on the second pair of teeth.For clamp A and B,the longer the distance to shaft,the larger pressure on stomach tissues.While for clamp C,the pressure on device-tissue interface showed little change along the path.Under tensile displacement,clamp A and B slipped off from the tissue when displacements reached to 5.0 mm and 6.5 mm,respectively,while clamp C did not slip off.Conclusions Clamp with page break angle and staggered tooth can exert the uniform maximum pressure to tissues and provide a larger contact area away from the rotating shaft,thus improving the anti-slippage and performance of the novel endoscopic closing device.

Structural improvement and analysis of a novel endoscopic succession closing device / 医用生物力学

Objective By developing a novel endoscopic succession closing device to overcome the shortcomings of existing devices that cannot deploy several clips at one time,to perform structural analysis on different clamp structures and to validate their performances in tissue closure through finite element analysis.Metbods Comparative analyses of 3 clamp structures,namely,the aligning tooth structure (original,clamp A),the staggered tooth structure (clamp B),a combination structure with page break angle and staggered tooth (clamp C),were performed to analyze pressure and its distribution on tissues when clamping the stomach wall.Displacement of 7.5 mm was then applied on the clamps to simulate the effect from operating procedures of the device and tissue kick-back.Results The maximum stresses of the clamp A and B were located on the first pair of teeth which was closest to the rotating shaft,with the stress of 10.39 kPa and 10.11 kPa,respectively.The maximum stress (11.35 kPa) of the clamp C was located on the second pair of teeth.For clamp A and B,the longer the distance to shaft,the larger pressure on stomach tissues.While for clamp C,the pressure on device-tissue interface showed little change along the path.Under tensile displacement,clamp A and B slipped off from the tissue when displacements reached to 5.0 mm and 6.5 mm,respectively,while clamp C did not slip off.Conclusions Clamp with page break angle and staggered tooth can exert the uniform maximum pressure to tissues and provide a larger contact area away from the rotating shaft,thus improving the anti-slippage and performance of the novel endoscopic closing device.

Finite element modeling and analysis on end-to-end anastomosis of the large intestine / 医用生物力学

Objective To analyze the relationship of closed staple height with tissue damage and compression pressure, so as to provide theoretical references and guidance for the surgeon to choose the appropriate staple cartridge and height, as well as improve the safety of operation. Methods The finite element model of stapled colorectal end-to-end anastomosis was established based on analysis of staple-tissue interaction. Large intestine tissues with different wall thicknesses (1.0-1.5 mm) were compressed by closed staples with 4 different height to compare changes in stress distributions and average radial pressure. Results When the tissues were compressed by closed staple with height of 1.0, 1.1, 1.2 and 1.5 mm, respectively, the average radial stress of compressed tissues with wall thicknesses of 1.2, 1.3, 1.4, and 1.5 mm were 56.0, 58.6, 59.7 and 57.3 kPa, respectively, which was close to the optimal compression pressure. Stress concentrations were found in contact area of the staple and tissues，with the maximum stress being 2 783, 1 750, 1940 and 2 030 kPa, respectively. Conclusions Tissue damage cannot be completely avoided in anastomotic surgery, and stress concentration is generally located near contact region of the staple and tissues. The optimal closed staple height ranges in 50%-60% of the uncompressed tissue height.

Structural improvement and analysis of a novel endoscopic succession closing device / 医用生物力学

By developing a novel endoscopic succession closing device to overcome the shortcomings of existing devices that cannot deploy several clips at a time, to perform structural analysis on different clamp structures and to validate their performances in tissue closure through finite element analysis. Methods Comparative analyses of three clamp structures, namely, the aligning tooth structure (original, clamp A), the staggered tooth structure (clamp B), a combination structure with page break angle and staggered tooth (clamp C), were performed to analyze pressure and its distribution on tissues when clamping the stomach wall. Displacement of 7.5 mm was then applied on the clamps to simulate the effect of the operating procedures of the device and tissue kick-back. Results The maximum stresses of the clamp A and B were located on the first pair of teeth which was closest to the rotating shaft, with the stress being 10.39 kPa and 10.11 kPa, respectively. The maximum stress (11.35 kPa) of the clamp C was located on the second pair of teeth. For clamp A and B, the longer the distance to shaft, the larger pressure on stomach tissues. While for clamp C, the pressure on device-tissue interface showed little change along the path. Under tensile displacement, clamp A and B slipped off from the tissue when displacements reached to 5 mm and 6.5 mm, respectively, while clamp C did not. Conclusions　Clamp with page break angle and staggered tooth can exert the uniform max pressure to tissues and provide a larger contact area away from the rotating shaft, thus improving anti-slippage and performance of the novel endoscopic closing device.

Significance of TNFAIP3 abnormity in natural killer/T-cell lymphoma, nasal type detected by fluorescence immunophenotyping and interphase cytogenetics / 临床与实验病理学杂志

Purpose To explore the prognostic value of deletion of the TNFAIP3 gene in natural killer/T-cell lymphoma,nasal type detected with fluorescence immunophenotyping and interphase cytogenetics as a tool for the investigation of neoplasm (FICTION).Methods FICTION was performed to detect the abnormalities of TNFAIP3 gene in 109 cases of natural killer/T-cell lymphoma,nasal type.Results TNFAIP3 deletion was found in 25/79 detectable cases.The deletion of TNFAIP3 was positively correlated with the International Prognosis Index (IPI) (P =0.019).Conclusion Frequent deletion of TNFAIP3 was associated with IPI in natural killer/T-cell lymphoma,nasal type,suggesting the important prognostic value of TNFAIP3 in the natural killer/T-cell lymphoma,nasal type.

Cloning and expression analysis of leucoanthocyanidin reductase gene in Fagopyrum dibotrys / 药学学报

The leucoanthocyantin reducase (LAR) gene, an important functional gene of catechins biosynthesis pathway, was cloned from Fagopyrum dibotrys (D.Don) Hara by degenerate PCR and rapid amplification of cDNA ends (RACE). The full-length cDNA of FdLAR is 1 581 bp (GenBank accession: JN793953), containing a 1 176 bp ORF encoding a 391 amino acids protein, and its 3'-untranslated region has an obvious polyadenylation signal. The recombinant plasmid containing FdLAR completed ORF was transformed into E. coli BL21 (DE3). The target fusion peptide with molecular weight of 66 kD was expressed under the condition of 16 degrees C and induced by IPTG at final concentration of 1.0 mmol x L(-1). Bioinformation analysis indicated that the amino acid sequence of FdLAR showed great homology to other LAR with the NADB-Rossmann conversed domain in the N-terminus. Real-time quantitative PCR was used to detect the expression levels of FdLAR gene during different development periods. The determination of flavonoids contents in appropriate rhizomes showed that the relationship between FdLAR gene expression and the accumulation of flavonoids displayed different trends during vegetative growth and reproductive growth stages, suggesting that the FdLAR gene may be involved in the pathway of flavonoid metabolisms in Fagopyrum dibotrys.

Molecular cloning and characterization of a novel isoflavone reductase-like gene (FcIRL) from high flavonoids-producing callus of Fagopyrum cymosum / 药学学报

Lignans are important defensive compounds in plants and have good biological activities protecting human health. In order to study the medicinal secondary metabolism of Fagopyrum cymosum (Trev.) Meisn, a traditional Chinese medicine with anti-tumor effect, a novel isoflavone reductase-like gene, FcIRL, was cloned using RACE strategy from a cDNA library of high flavonoids-producing callus. The full-length cDNA of the FcIRL was 1 217 bp (accession no. EU116032), which contained a 942 bp open reading frame (ORF) encoding a 313 amino acid protein. Two stop codons (TAG) and a putative polyadenylation signal ATAAA at 24 bp upstream from the polyadenylation site was found in 5' and 3' UTR, separately. And no intron was found in the genomic sequence yet. FcIRL contained a predicted N-terminal acetylation site (M1-K5) and a NADPH-binding motif (G10-G-T-G13-Y-I-G16) in the N-terminal region, a conserved NmrA (nitrogen metabolite repression regulator) domain (V6-N244), multi-phosphorylation sites and one conserved N-glycosylation site (N214). Sequence homology comparison, phylogenetic analysis and advanced structures prediction all suggested that FcIRL belonged to the class of pinoresinol-lariciresinol reductase (PLR), which is a key enzyme in synthetic pathway of 8-8'-linked lignans, with function in catalyzing reduction of pinoresinol and lariciresinol into secoisolariciresinol, and medicinal secondary metabolism and resistance in F. cymosum.

Monosaccharide composition analysis and its content determination of polysaccharides from Rhaponticum uniforum / 中国中药杂志

<p><b>OBJECTIVE</b>To analyze the monosaccharide composition in the polysaccharides from Rhaponticum uniforum, determine the content of monosaccharide, and provide some references for further research.</p><p><b>METHOD</b>The monosaccharide composition was determined by high performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD). Phenol-sulfuric acid method was used for the determination of the content of polysaccharide.</p><p><b>RESULT</b>The monosaccharides composition in polysaccharides from R. uniforum are glucose, arabonose and fructose. Their molar ratios are 1 : 1.61 : 2.21. The content of polysaccharide is 95.78%, taking the mixture of monosaccharide compositions as reference substances.</p><p><b>CONCLUSION</b>HPAEC-PAD can be used to analyze the monosaccharide composition in the polysaccharide with high precision, and the method of phenol-sulfuric acid is simple, convenient and reliable.</p>

Experimental study of transplanting human mesenchymal stem cells via portal vein to treat acute liver injury of mice induced with acetaminophen / 中华肝脏病杂志

<p><b>OBJECTIVE</b>To evaluate the effects of human mesenchymal stem cells (hMSCs) transplantation via portal vein to treat acute liver injury in mice induced with acetaminophen.</p><p><b>METHODS</b>A model of acute liver injury was established by acetaminophen gavage with a dose of 500 mg/kg. Twenty severe combined immune deficient mice (SCID mice) were randomly divided into 2 groups; one with hMSCs transplantation via their portal veins, the other group served as controls and only saline was infused into their veins. Liver function tests, fluorescein staining and reticular fiber staining of liver histological preparations and fluorescence- and light-microscopy were applied to observe the biochemical and pathological changes in the mice before and after the transplantation of hMSCs.</p><p><b>RESULTS</b>Liver function of the hMSCs group was significantly better than that of the controls (P less than 0.05). Fluorescence microscopy revealed that the hMSCs appeared in the areas of the periportal veins at first and then extended to the central vein areas; the reticular fiber staining indicated that hMSCs could repair the architecture of the hepatic acini. No prominent fibrosis and pseudolobules were found.</p><p><b>CONCLUSIONS</b>hMSCs transplantation via portal vein to SCID mice with acute liver injury induced by acetaminophen can improve their liver function effectively; hMSCs growth in their livers and acinus reconstruction can be affected. We think it is a good method to treat acute liver injury.</p>