1.Study on Rapid Elemental Analysis of Tibetan Medicine “GTso Thal” by LIBS Technique
Xiaona LIU ; Xinyuan SHI ; Shuaiyun JIA ; Na ZHAO ; Zhisheng WU ; Yanjiang QIAO
World Science and Technology-Modernization of Traditional Chinese Medicine 2014;(12):2582-2585
Laser-induced breakdown spectroscopy (LIBS) was applied to perform qualitative research on Tibetan medicine “GTso Thal” in order to establish a rapid element analysis method . The Nd: YAG laser with the funda-mental frequency at 1064 nm was used. A high-power laser beam was focused on the surface of the sample. The spectrometer and CCD was used to detect its spectrum signals. Based on the National Institute of Standards and Technology (NIST) database, emission spectrum characteristics were differentiated. The LIBS spectra of “GTso Thal”showed multi-elements including Hg, Ca, Na, As, Fe, Mg, Al, K, Li, Pb, Ag, Au and S. Among them, Hg, Pb, Ag and Au were heavy mental elements. The results demonstrated that LIBS was a viable technique for analysis of Ti-betan medicine “GTso Thal”. LIBS provided reliable elemental analysis on Tibetan medicine “GTso Thal”. The de-tection was real-time, rapid and in situ. It had prospects in the elemental analysis of ethnic medicine study. LIBS had broad application prospects.
2.Comparison of expression and antibacterial activities of recombinant porcine lactoferrin expressed in four Lactobacillus species.
Hui YU ; Yanping JIANG ; Wen CUI ; Xiao WU ; Jia HE ; Xinyuan QIAO ; Yijing LI ; Lijie TANG
Chinese Journal of Biotechnology 2014;30(9):1372-1380
The coding sequence for the mature peptide of porcine lactoferrin (Plf) was synthesized according to the codon usage of lactobacillus, to establish optimized porcine lactoferrin Lactobacillus expression system. The gene was ligated into the Xho I/BamH I site of Lactobacillus expression vector pPG612.1 and the recombinant plasmid pPG612.1-plf was transformed individually into Lactobacillus casei ATCC393, Lactobacillus pentosus KLDS1.0413, Lactobacillus plantarum KLDS1.0344 or Lactobacillus paracasei KLDS1.0652 by electroporation. After induction with xylose, expression of the recombinant proteins was detected by Western blotting and confocal laser scanning microscopy. Secretion of recombinant Plf proteins from four recombinant species was determined quantitatively by ELISA. The antibacterial activities of recombinant proteins were measured by agar diffusion method. The result shows that Plf was correctly expressed in four species of recombinant lactobacillus, with molecular weight of about 73 kDa. The expression levels in recombinant Lactobacillus casei, Lactobacillus pentosus, Lactobacillus plantarum, Lactobacillus paracasei were 9.6 μg/mL, 10.8 μg/mL, 12.5 μg/mL and 9.9 μg/mL, respectively. Antimicrobial activity experiment shows that the recombinant proteins were active against E. coli, Staphylococcus aureus, Salmonella typhimurium, Listeria, Pasteurella. The recombinant Plf expressed by recombinant Lactobacillus plantarum showed the best antibacterial activity among all recombinant lactobacillus species. These data represent a basis for the development and application of porcine lactoferrin from recombinant lactobacillus.
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Anti-Bacterial Agents
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biosynthesis
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Lactobacillus
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metabolism
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Lactoferrin
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biosynthesis
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Recombinant Proteins
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biosynthesis
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Swine
3.The study of the relationship between influenza virus infection and the dysfunction of vascular smooth muscle cells
Xiuru GUAN ; Xinyuan JIA ; Xiaochen YU ; Na ZHANG ; Yuling JIANG ; Xiaomin XIN
Chinese Journal of Microbiology and Immunology 2012;(10):841-844
Objective To research the influenza virus infection on rat vascular smooth cells number,proliferation,apoptosis,the amount of IL-6,sFas,platelet-derived growth factor(PDGF) and the mechanism of atherosclerosis.Methods Flow cytometry,enzyme-linked immunosorbent assay and cell count experiments were used to detect these indicators at 0 h,6 h,12 h,24 h,48 h.Results After influenza virus infected at 0 h,proliferation,apoptosis condition were 10.39%,0.44%,respectively; at 6 h,proliferation,apoptosis respectively increased to 12.68%,0.73% ; proliferation reached the peak at 12 h (18.01%),instead apoptosis decreased to 0.14% ; at 24 h,proliferation decreased to 12.89% and apoptosis markedly increased to 1.09% ; at 48 h,proliferation further reduced to 7.07% and apoptosis reached the peak(4.61%).The number of cells and the cytokine secretion were statistically significant to control group (P<0.05).Conclusion Influenza virus infection might lead to change of cell proliferation and apoptosis and involve the atherosclerosis form and development,and cytokines played an important role in them.
4.Pathogen distribution and risk factors of pulmonary infection after acute cervical spinal cord injury
Axiang HE ; Dong XIE ; Chenhui XU ; Xinyuan LIAO ; Lili YANG ; Xiongsheng CHEN ; Lianshun JIA
Chinese Journal of Trauma 2016;32(5):449-452
Objective To investigate the pathogen distribution and risk factors of pulmonary infection after acute cervical spinal cord injury (ACSCI) in an attempt to offer reference for early antiinfection therapy.Methods The study comprised 223 cases who were admitted from October 2011 to October 2014.There were 149 males and 74 females,at (43.3 ± 13.5) years of age.Species of pathogens identified were gram-positive,gram-negative and mixed.Effects of age,gender,injury types and tracheotomy on pathogen distribution were analyzed.Results Gram-negative infection was found in 114 cases (51.1%),with tracheotomy accounting for 7.0% of the cases and death accounting for 1.8% of the cases,and the main causative pathogens were Klebsiella pneumonia,Escherichia coli,Pseudomonas aeruginosa and Acinetobacter baumannii.Gram-positive infection was found in 41 cases (18.4%),with tracheotomy accounting for 12.2% of the cases and death accounting for 7.3% of the cases,and the main causative pathogens were Staphylococcus aureus and Streptococcus pneumonia.Mixed infection was found in 68 cases (30.5%),with tracheotomy accounting for 22.1% of the cases and death accounting for 13.2% of the cases.Gender had no significant correlation with pathogen distribution.For the cases of complete spinal cord injury and tracheotomy,the ratio of mixed infection increased significantly (P < 0.05).For the cases younger than 30 years,the pathogens were mainly gram-positive bacteria (P < 0.05).Conclusions Main pathogens of pulmonary infection after ACSCI are gram-negative bacteria.The cases younger than 30 years are associated with higher risk of grampositive infection,while the cases with complete injury or tracheotomy are associated with higher risk of mixed infection.
5.Establishment of a scoring model based on ultrasonic characteristics for predicting the restenosis after superficial femoral artery stenting
Mingjie GAO ; Yang HUA ; Lingyun JIA ; Xinyu ZHAO ; Ran LIU ; Bing TIAN ; Xinyuan CHU
Chinese Journal of Ultrasonography 2021;30(1):42-47
Objective:To establish a comprehensive and effective scoring model based on ultrasonic characteristics for predicting the restenosis risk after superficial femoral artery stenting, in order to assess the possibility of in-stent restenosis and to provide guidance for the selection of therapeutic strategies.Methods:A retrospective review of a database of 328 patients (381 limbs) undergoing superficial femoral artery stents in Xuanwu Hospital, Capital Medical University from January 2016 to January 2018 was made as a modeling group.In the modeling cohort, the multivariate logistic regression analysis was performed to screen independent risk factors for in-stent restenosis. A predictive scoring model of restenosis risk was established with weighted score of independent risk factors according to the odd ratio values. Based on the best cut-off value of the receiver operating characteristic (ROC) curves, the scoring table was divided into low-risk and high-risk groups of restenosis.Results:Multivariate logistic regression analysis showed that 8 factors were included in the score system to establish the scoring model of in-stent restenosis risk prediction including calcified plaque, peak systolic velocity of popliteal artery<40 cm/s, runoff scores≥4, ankle-brachial index<0.5, female (1 point each); complicated stroke, complicated chronic renal disease, total lesion length 15.0-24.9 cm (2 points each); total lesion length≥25.0 cm (3 points), a total of 12 points in the model. The validation indicated that the scoring system had good predictive value(AUC=0.775, 95% CI=0.727-0.824, P<0.001) and goodness of fit (Hosmer-Lemeshow χ 2=4.921, P=0.766). The agreement with digital subtraction angiography(DSA) was good (Kappa value=0.609). The scoring system was further divided into the low-risk restenosis (0-5 points) and high-risk restenosis (6-12 points) according to the best cut-off value of 5.5, with a sensitivity of 68.1%, a specificity of 74.6%, and the accuracy of 72.7%. Conclusions:The superficial femoral artery in-stent restenosis risk predicting score model based on ultrasonic characteristics may accurately predict the restenosis preoperatively. It provides a theoretical basis for the precise surgical plans.
6.Role of cell adhesion molecule L1 like in the inhibition of the metastasis of esophageal squamous cell carcinoma
Hong TANG ; Yufeng WU ; Yongxu JIA ; Yanru QIN ; Qiming WANG ; Xianzeng WANG ; Xinyuan GUAN
Chinese Journal of Digestion 2018;38(3):158-164
Objective To investigate the role of cell adhesion molecule L1 like (CALL) in the genesis and development of esophageal squamous cell carcinoma (ESCC).Methods From July 2007 to December 2010,a total of 100 patients with ESCC who received radical resection of esophageal cancer were enrolled.The ESCC tissues and corresponding tumor-adjacent normal tissues were obtained.The expression of CALl was determined by tissue microarray technology and immunohistochemical staining.The CALL over-expressed esophageal cancer cell line was established.The effects of CALL on cell migration and invasion were detected by wound-healing assay and Transwell assay,respectively.The effects of CALL on actin microfilament was analyzed by filamentous actin (F-actin) staining.Chi square test,Fisher's exact test,multivariate analysis and t test were performed for statistical analysis.Results The positive expression rate of CALL in ESCC tissues was 56 % (56/100),which was lower than that of tumor-adjacent normal tissues (95%,95/100),and the difference was statistically significant (x2=41.114,P<0.01).There were statistically significant differences in CALL expression at protein level among patients with ESCC of different differentiation degree,different pathological T stage,lymph node metastasis and different TNM stage (x2=13.702,5.317,21.453,Fisher's exact test;all P< 0.05).The five year disease related survival rate of ESCC patients with down-regulated expression of CALL was 0(0/49),which was lower than those with normal CALL expression (25.5%,13/51),and the difference was statistically significant (x2 =43.338,P<0.01).The median survival time of CALL expression down-regulated group was 17 months,and that of normal expressed group was 38 months.CALL expression was an independent risk factor of disease special survival rate (hazard ratio (HR) 0.353,95% confidence interval (CI) 0.188 to 0.666,P=0.001).The results of wound-healing assay showed that the migration ability of CALL overexpressed CALL-k30 cells was lower than that of Vec-k30 cells in control group on 24 hours after wound.The results of Transwell invasion test showed the number of migrating cells penetrating CALL k30 cells attached to the inferior surface of the membrane was 44.000±13.748,which was less than that of the Vec k30 cells (154.333±25.007),and the difference was statistically significant (t=5.136,P=0.036).The results of F-actin staining demonstrated that actin filaments of CALL-k30 cells was 234.667 ± 65.118,which was lower than that of Vec-k30 cells (597.000± 119.929),and the difference was statistically significant (t=4.707,P=0.042).Conclusions CALL lowers the migration and invasion abilities of esophageal cancer cells by inhibiting F-actin microfilaments.Its abnormal expression may play an important role in the genesis,development and prognosis of ESCC.
7. Effect of different frequency hyperbaric oxygen preconditioning on ischemia-reperfusion injury of rat flap after transplantation
Jia CUI ; Bojie LIN ; Xinyuan PAN ; Siding LU ; Jiangying ZHU ; Jieyun CAI ; Jinjun PANG ; Guoqian YIN
Chinese Journal of Plastic Surgery 2019;35(12):1249-1257
Objective:
To explore the effect of hyperbaric oxygen preconditioning with different frequency on the survival rate of flap and ischemia-reperfusion injury in rats after transplantation, and to explore the best preconditioning conditions to improve the survival rate of rat flaps after transplantation.
Methods:
Thirty-six Sprague Dawley rats were randomly divided into four groups according to the random number table method, 9 groups in each group.Four groups of rats were pretreated with hyperbaric oxygen pretreatment for 0, 2, 4, and 6 days before the operation, control group, pretreatment 2 d group, pretreatment 4 d group, and pretreatment 6 d group. Taking the midline of the back of the rat as the axis, an ultra-long random flap with a pedicle at the tail end and about 1 cm from the superior iliac spine was designed and cut to a size of 10.0 cm×2.5 cm. The survival of the flaps in each group was observed and the final survival area and survival rate of the flaps were measured on the 7th day after surgery. On the 7th day after operation, the tissue was taken at a distance of 5 cm from the pedicle, and the histopathology was observed; The content of superoxide dismutase (SOD) and malondialdehyde (MDA) in flap tissue was detected by immunohistochemistry, and the expression rate of positive cells in each group was calculated. Immunofluorescence was used to detect the expression of interleukin-6 (IL-6) in the flap tissue.
Results:
On the 7th day after the operation, the survival area and survival rate of the transplanted flaps in the hyperbaric oxygen pretreatment group were significantly higher than those in the control group (