1.The effects of fluoride toothpaste and fluoride varnish on enamel remineralization and acid resistance:An in vitro study
Bowen YAO ; Haokun XU ; Shengchao WANG
Journal of Practical Stomatology 2014;(5):611-615
Objective:To investigate the ability of fluoride toothpaste and fluoride varnish on enamel remineralization and acid resist-ance.Methods:Enamel specimens were prepared from bovine incisors,and were randomly divided into 4 groups(n=3)after acid-etching by 37%phosphoric acid.Specimens in group A(control)was processed daily with normal saline;those in group B and C were treated once with Duraphat varnish and Fluor Protector varnish respectively;in group D was daily processed with fluoride toothpaste. All specimens were incubated in artificial saliva for 2 weeks.Then all specimens received acid-etching again.Micro-hardness test, SEM observation and image analysis were performed before and after each step.Results:After 2 weeks of processing,no remineraliza-tion was found in group A.Varnish layers were observed on the surface of specimens in group B and C.In group D remineralization was detected on the enamel surface.After re-etching,micro-hardness decreased in group A and D.Fluoride varnish layers in group B and C showed strong resistance to acid-etching.After re-etching,area of micro-holes in group A and D increased(P<0.05 ),but that in group D was smaller than in the control(P<0.05).No micro-hole was observed in group B and group C.Conclusion:Protec-tive layer formed on the enamel surface by fluoride varnish is resistant to acid-etching and promotes enamel remineralization.Fluoride toothpaste application can promote enamel remineralization,but with less resistance to acid.
2.Activated hepatic stellate cells and its relationship with hepatocellular carcinoma
Shaoshan HAN ; Xiaoyan HE ; Bowen YAO ; Qingguang LIU
Chinese Journal of Hepatobiliary Surgery 2016;22(10):711-713
Interactions between hepatocellular carcinoma (HCC) cells and the tumor stromal microenvironment have profound effects on tumor growth,epithelial-mesenchymal transition (EMT),invasion and metastasis.Activated hepatic stellate cells (HSCs) are the major subtype of stromal cells in the liver tumor microenvironment.HCC cells can induce the activation of HSCs during carcinogenesis,while activated HSCs promote HCC cells growth and migration through secreting growth factors,inducing angiogenesis and immune suppression.Bidirectional interactions between HCC cells and HSCs may function as an "amplification loop" to further enhance metastatic growth in the liver.In this review,we summarized the most recent data from the research on HSCs and its relationship with HCC.
3.Epidemiological and genetic characteristics of sapovirus clusters in Changzhou schools from 2019 to 2022
YAO Ping, LI Qiong, JIANG Xia, MAO Xujian, XU Jian, TU Bowen, WANG Fengming, JIANG Jingyi
Chinese Journal of School Health 2023;44(10):1574-1577
Objective:
To analyze the epidemiological characteristics and genetic characteristics of sapovirus (SaV) in a cluster of schools in Changzhou, so as to provide a reference for the treatment of clustered vomiting and diarrhea events in schools.
Methods:
The epidemiological data and laboratory test data of sapovirus clusters in Changzhou from 2019 to 2022 were collected and analyzed. Partial VP1 genes of SaV positive samples were amplified and sequenced for phylogenetic analysis.
Results:
A total of 8 cases of clusters of SaV epidemics were reported in Changzhou City from 2019 to 2022, with 118 reported cases. The total attack rate was 1.47%, and the median of the attack number was 15. There were 6 outbreaks in kindergartens and 2 outbreaks in primary schools, which were reported in the epidemic period from September to December. The main clinical manifestations were vomiting (113 cases, 95.76 %), abdominal pain (39 cases, 33.05%), and diarrhea (16 cases, 13.56%). Among the 8 outbreaks, 17 sample strains were successfully sequenced. 5 outbreaks were GII.3 , and the other 3 outbreaks were GI.1, GI .3 and GII.2. GI and GII were the main genotypes in this area, and GII .3 was the predominant strain.
Conclusion
SaV is an important pathogen in the clusters of vomiting and diarrhea in schools after the transmission of norovirus. Continuous surveillance of SaV should be carried out to further understand its epidemiological characteristics and genotype distribution, so as to provide scientific basis for the prevention and control of the epidemic in schools.
4.Effects and safety of immunosuppressor combined with corticosteroid on Henoch-Sch?nlein purpura nephritis: a Meta-analysis
Zhongbin TAO ; Yandong FENG ; Jie WANG ; Yongkang ZHOU ; Xiaoli YAN ; Jia YAO ; Yiqing WANG ; Bowen LI ; Jizu LING ; Xinhui YUAN
Chinese Pediatric Emergency Medicine 2021;28(9):785-792
Objective:To assess the efficacy of immunosuppressor on treatment of Henoch-Sch?nlein purpura nephritis(HSPN).Methods:Literatures were searched in PubMed, Cochrane library, Web of Science, Wanfang database, CNKI and CBM database from inception to January 2021.The studies that investigated the effect of immunosuppressor on HSPN outcomes were included.Article screening, data extraction and quality assessment were accomplished by two investigators independently, and statistical analyses were performed by STATA 14.Results:Ten studies were included with 443 cases, of which, 245 cases were in the experimental group while 198 cases were in the control group.The Meta-analysis showed that the experimental group had higher complete remission rate( OR=1.95, 95% CI 1.19-3.22, P=0.009), total remission rate ( OR=2.92, 95% CI 1.74-4.88, P<0.001), proteinuria decreasing level ( SMD=0.35, 95% CI 0.09-0.61, P=0.008), the increasing level of serum albumin ( SMD=1.27, 95% CI 0.43-2.11, P=0.003) and the increasing level of estimated glomerular filtration rate ( SMD=0.48, 95% CI 0.21-0.76, P=0.001), lower relapse rate ( OR=0.19, 95% CI 0.05-0.72, P=0.015) as well as death rate ( OR=0.19, 95% CI 0.04-0.78, P=0.021)than those of the control group. Conclusion:The immunosuppressor could enhance complete remission rate, total remission rate, proteinuria decreasing level, the increasing level of serum albumin and the increasing level of estimated glomerular filtration rate, reduce relapse rate and death rate of HSPN patients.
5.Clinical efficacy of Atezolizumab and Bevacizumab in the treatment of initially borderline resectable advanced liver cancer
Bowen YAO ; Junxi XIANG ; Xin ZHENG ; Hao SUN ; Wei YANG ; Yuelang ZHANG ; Feng YE ; Dongli ZHAO ; Yingmin YAO ; Qingguang LIU ; Cheng GUO
Chinese Journal of Digestive Surgery 2022;21(2):303-306
Conversion therapy has become the core in the treatment of borderline resectable or unresectable liver cancer, which provides resectable opportunities for more advanced liver cancer patients. In accordance with the first-choice treatment regimen recommended by the guidelines, the authors reported a successful case of Atezolizumab and Bevacizumab (T+A regimen) conversion therapy. The patient with initially borderline resectable advanced liver cancer was performed liver segment resection sucessfully after conversion therapy, and non-tumor recurrence was observed at postoperative 9 months. Postoperative pathological examination showed combined hepatocellular-cholangiocarcinoma, which also indicated the important value of T+A regimen in the conversion therapy of combined hepatocellular-cholangiocarcinoma.
6.Quantitative analysis of the effect of contact pressure on the reflection characteristics of radial pressure wave.
Junyi TAN ; Lisheng XU ; Hongming SUN ; Bowen XU ; Yongchun LI ; Yudong YAO
Journal of Biomedical Engineering 2022;39(6):1127-1132
The radial artery pulse wave contains a wealth of physiological and pathological information about the human body, and non-invasive studies of the radial artery pulse wave can assess arterial vascular elasticity in different age groups.The piezoelectric pulse wave transducers were used to non-invasively acquire radial artery pulse waves at different contact pressures in young and middle-aged and elderly populations. The radial artery waveforms were decomposed using a triangular blood flow model fitting method to obtain forward and reflected waves and calculate reflection parameters. Finally a correlation analysis and regression analysis of the contact pressure Psensor with the reflection parameters was carried out. The results showed that the reflection parameters RM, RI and Rd had a strong negative correlation with Psensor in both types of subjects, and the correlation coefficients and slopes of the regression curves were significantly different between the two types of subjects (P<0.05). Based on the results of this study, excessive contact pressure on the transducer should be avoided when detecting radial artery reflection waves in clinical practice. The results also show that the magnitude of the slope of the regression curve between the reflection parameters and the transducer contact pressure may be a potentially useful indicator for quantifying the elastic properties of the vessel.
Middle Aged
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Aged
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Humans
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Blood Pressure/physiology*
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Arteries
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Blood Flow Velocity/physiology*
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Elasticity
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Pulse Wave Analysis
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Radial Artery/physiology*
7.Effect of total flavone of oldenlandia diffusa on the proliferation, apoptosis and stemness of breast cancer MDA-MB-231 cell lines
Bowen YAO ; Yazhao LI ; Jingyu LI ; Chaoyi LI ; Ye LU ; Jiequn MA ; Yanbing ZHANG
Journal of Xi'an Jiaotong University(Medical Sciences) 2023;44(6):880-885
【Objective】 To investigate the effect of total flavone of oldenlandia diffusa(FOD) on the stemness, proliferation and apoptosis of breast cancer(BC) stem cells sorted from MDA-MB-231. 【Methods】 Human BC cell lines MDA-MB-231 was cultured in vitro; MDA-MB-231 was stimulated by different concentrations(0 μg/mL, 100 μg/mL, 200 μg/mL and 400 μg/mL) of FOD for different time (24 h, 48 h and 72 h). CCK8 and plate cell cloning assay were used to detect the effect of FOD on MDA-MB-231 proliferation; CD44+/CD24-MDA-MB-231 cell line were tested by flow cytometry and stem cell markers such as Nanog, Oct4 and Sox2 were tested by Western blotting; Annexin V-PE/7-AAD was used to detect the effect of FOD on MDA-MB-231 apoptosis and Bcl2, cleaved-caspase3 and Bax were tested by Western blotting. 【Results】 Cell proliferation of MDA-MB-231 was significantly inhibited by FOD, with the significant suppression at concentrations of 400 μg/mL for 72 h compared with negative control group(P<0.05). The apoptosis rate was significantly upregulated than the negative control group (P<0.05). The protein expression of Bcl2 decreased while Bax and cleaved-caspae3 increased, and stemness markers such as Nanog, Sox2 and Oct4 decreased in FOD-treated cells. Moverover, Akt-GSK3β-β-catenin axis was inhibited in FOD-treated cells. 【Conclusion】 FOD could significantly inhibit the stemness and proliferation and promote the apoptosis of MDA-MB-231.
8.Clinical results of surgical repair combining an occluder and a patch for ventricular septal rupture after myocardial infarction
Jiawei ZHOU ; Xingxing YAO ; Fuqiang SUN ; Bowen GUO ; Cheng ZOU ; Haibo ZHAN ; Chao LIU
Chinese Journal of Clinical Thoracic and Cardiovascular Surgery 2023;30(03):416-421
Objective To investigate the effect and prognosis of patients with ventricular septal rupture after myocardial infarction treated by surgical repair combining an occluder and a patch. Methods Clinical data of 42 patients with myocardial infarction complicated with ventricular septal rupture admitted to the First Affiliated Hospital of Zhengzhou University from January 2010 to September 2021 were retrospectively analyzed. According to the surgical methods, 27 patients were divided into a traditional group, including 17 males and 10 females, with an average age of 62.81±6.81 years, who were repaired by patch only, and 15 patients were divided into a modified group, including 11 males and 4 females, with an average age of 64.27±9.24 years, who were repaired by surgery combining an occluder and a patch. Perioperative and follow-up data of the two groups were compared and analyzed. Results There were statistical differences between the two groups in preoperative Killip grading, rate of intra-aortic balloon pump use, interval from myocardial infarction to operation, and the number of culprit artery (P<0.05). There was no statistical difference in other preoperative data, the cardiopulmonary bypass time, aortic cross-clamping time, postoperative hospital stay or in-hospital death rate between the two groups (P>0.05). No residual shunt occurred in the modified group, and the difference was statistically significant compared with the traditional group (P=0.038). There was no statistical difference in other complications between the two groups (P>0.05). The median follow-up time was 4 years. Two patients in the traditional group and one in the modified group died during follow-up. The follow-up cardiac function grading of patients in the modified group was statistically different from that in the traditional group (P=0.023). Conclusion The perioperative mortality of ventricular septal rupture after myocardial infarction is high, but the long-term effect is satisfactory. Surgical repair combining an occluder and a patch is a safe and effective treatment for ventricular septal rupture, which can effectively reduce postoperative residual shunt.
9.Effects of total flavone of oldenlandia diffusa on the proliferation and apoptosis of hepatocellular carcinoma stem cell
Bowen YAO ; Yazhao LI ; Zijun LIAO ; Ye LU ; Xiang ZHANG ; Jiequn MA ; Qian LI ; Yanbing ZHANG
Journal of Xi'an Jiaotong University(Medical Sciences) 2023;44(3):389-395
【Objective】 To investigate the effects of total flavone of oldenlandia diffusa (FOD) on the proliferation and apoptosis of hepatocellular carcinoma (HCC) stem cells sorted from Huh7. 【Methods】 Human HCC cell lines Huh7 was cultured in vitro; CD133 positive (CD133+) stem cells in Huh7 cell line were sorted by flow cytometry, and stem cell markers such as Nanog, Oct4 and Sox2 were tested by Western blotting. CD133+-Huh7 was stimulated by different concentrations (0 μg/mL, 50 μg/mL, 100 μg/mL and 400 μg/mL) of FOD for different time (24 h, 48 h, 72 h and 96 h). CCK8 and plate cell cloning assay were used to detect the effect of FOD on CD133+-Huh7 proliferation while Annexin V-PE/7-AAD was used to detect the effect of FOD on CD133+-Huh7 apoptosis. Western blotting was used to detect the protein expressions of protein 53 (P53), factor associated suicide-Fas-associating protein with a novel death domain (Fas-FADD), B-cell lymphoma-2 (Bcl-2), Cleaved-Caspase3, and Bcl-2 associated X protein (Bax). 【Results】 More than 95% of stem cells were purified for further experiments. Cell proliferation of CD133+-Huh7 was significantly inhibited by FOD, with the significant suppression at the concentration of 100 μg/mL for 72 h compared with negative control group (P<0.05). The apoptosis rate was significantly upregulated than that in the negative control group (P<0.05). The protein expression of Bcl2 decreased while Bax and Cleaved-Caspae3 increased via FAS/FADDD and P53 axis. 【Conclusion】 FOD can significantly inhibit the proliferation and promote the apoptosis of CD133+-Huh7.
10.Single chain antibody fragment display systems: a review.
Yao CHEN ; Xingfu SHU ; Yu ZHAO ; Bowen ZHANG ; Zhongren MA ; Haixia ZHANG
Chinese Journal of Biotechnology 2023;39(9):3681-3694
Single chain antibody fragment (scFv) is a small molecule composed of a variable region of heavy chain (VH) and a variable region of light chain (VL) of an antibody, and these two chains are connected by a flexible short peptide. scFv is the smallest functional fragment with complete antigen-binding activity, which contains both the antibody-recognizing site and the antigen-binding site. Compared with other antibodies, scFv has the advantages of small molecular weight, strong penetration, low immunogenicity, and easy expression. Currently, the most commonly used display systems for scFv mainly include the phage display system, ribosome display system, mRNA display system, yeast cell surface display system and mammalian cell display system. In recent years, with the development of scFv in the field of medicine, biology, and food safety, they have also attracted much attention in the sectors of biosynthesis and applied research. This review summarizes the advances of scFv display systems in recent years in order to facilitate scFv screening and application.
Animals
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Immunoglobulin Variable Region/genetics*
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Immunoglobulin Fragments/metabolism*
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Single-Chain Antibodies/metabolism*
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Peptide Library
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Mammals/genetics*