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Environmental pollution and DNA methylation: carcinogenesis, clinical significance, and practical applications

null

《医学前沿(英文)》 2015年 第9卷 第3期   页码 261-274 doi: 10.1007/s11684-015-0406-y

摘要:

Environmental pollution is one of the main causes of human cancer. Exposures to environmental carcinogens result in genetic and epigenetic alterations which induce cell transformation. Epigenetic changes caused by environmental pollution play important roles in the development and progression of environmental pollution-related cancers. Studies on DNA methylation are among the earliest and most conducted epigenetic research linked to cancer. In this review, the roles of DNA methylation in carcinogenesis and their significance in clinical medicine were summarized, and the effects of environmental pollutants, particularly air pollutants, on DNA methylation were introduced. Furthermore, prospective applications of DNA methylation to environmental pollution detection and cancer prevention were discussed.

关键词: environmental pollution     DNA methylation     cancer     biomarker     diagnosis     therapy     prevention    

Structural dimension optimization and mechanical response analysis of fabricated honeycomb plastic pavement slab

Zixuan CHEN; Tao LIU; Xiao MA; Hanyu TANG; Jianyou HUANG; Jianzhong PEI

《结构与土木工程前沿(英文)》 2022年 第16卷 第7期   页码 896-908 doi: 10.1007/s11709-022-0856-7

摘要: Because of favorable mechanical properties, deformation resistance and being conducive to environmental protection, honeycomb fabricated plastic pavement slabs are highly recommended these years. At present, most studies focus on the performance of plastic materials, however, the dimension optimization of fabricated plastic pavement slab is rarely mentioned. In this paper, an optimized geometry of the honeycomb pavement slab was determined through finite element analysis. Mechanical response of honeycomb slabs with different internal dimensions and external dimensions were explored. Several dimension factors were taken into consideration including the side length, rib thickness, the thickness of both top and bottom slabs of honeycomb structure and the length, the width and the thickness of the fabricated plastic slab. The results showed that honeycomb pavement slab with 6 cm bottom slab, 12 cm top slab,18 cm side length and 6 cm rib thickness is recommended, additionally, an external dimension of 4 m × 4 m × 0.45 m is suggested. Then, the mechanical responses of this optimized fabricated plastic slab were further investigated. Significance of different influencing factors, including wheel load, elastic modulus of plastic material, base layer thickness, soil foundation modulus and base layer modulus were ranked.

关键词: honeycomb structure     plastic pavement     dimension optimization     mechanical response     factor significance    

Prognostic significance of clinicopathologic parameters in gastrointestinal stromal tumors: a study of

LIANG Yumei, LI Xianghong, LU Youyong, LV Yali, ZHONG Mei, PU Xiaolu, LI Wenmei

《医学前沿(英文)》 2008年 第2卷 第1期   页码 87-94 doi: 10.1007/s11684-008-0016-z

摘要: The biological behavior of gastrointestinal stromal tumors (GISTs) are highly variable. To investigate the biological behavior of GIST, we collected 83 cases of gastric and 62 cases of small intestinal GIST from the Department of Pathology of the Chinese PLA General Hospital. The parameters include age, primary tumor location, tumor diameter, mitotic index, tumor necrosis, risk assessment, clinical stage and the exon 11 mutation. All these were analyzed in 105 cases along with the follow-up data and tested by log rank and COX hazard proportional model. We find that the average age of gastric GIST was 55.4 years. Of the 62 cases that were followed up, 17 cases had metastasis or recurrence and the 5-year survival rate was (66.51 ± 17.06)%. For the small intestinal GIST, the average age was 50.6 years and 43 cases were followed up. Of these, 22 cases had metastasis or recurrence and the 5-year survival rate was (61.76 ± 18.30)%. Small intestinal GIST was more frequently associated with metastasis and tumor relapse than gastric GIST ( = 6.131, = 0.013). For gastric GIST, patients younger than 50 years ( = 0.046), the advanced clinical stage ( = 0.0001), the large tumor diameter ( = 0.0001), a high mitotic index ( = 0.0001), necrosis ( = 0.0001) and a high risk grade ( = 0.004) were all correlated with a lower survival rate. The COX hazard proportional model revealed that advanced clinical stage ( = 0.001), large tumor size ( = 0.001), a high mitotic index ( = 0.002) and the high risk grade ( = 0.018) indicated a poorer prognosis in gastric GIST. For small intestinal GIST, necrosis ( = 0.036) and advanced clinical stage ( = 0.010) were associated with lower survival rates and the clinical stage was shown to be an independent prognostic indicator. A total of 25 cases harbored mutations in exon 11. The frequency of mutation was 32% and 22.5% for gastric and small intestinal GIST, respectively. In gastric GIST, the mutated was predominant in patients older than 50 years of age. But in the small intestinal GIST, the mutated was predominant in the age group of 40–49 years. In conclusion, for gastric GIST, clinical stage, tumor size, mitotic index, and risk grade are the prognostic indicators. For small intestinal GIST, necrosis and clinical stage are the prognostic indicators. Small intestinal GIST are more aggressive than gastric GIST. The occurrence of mutation may correlate with the age of patients.

Change and significance of T-cell subsets and TNF-α in patients with advanced malignant obstructive jaundice

ZHU Lidong, CHEN Xiaoping

《医学前沿(英文)》 2007年 第1卷 第4期   页码 364-368 doi: 10.1007/s11684-007-0070-y

摘要: The aim of this article was to study the influence of immunity function of advanced malignant obstructive jaundice (MOJ) treated by percutaneous transhepatic biliary external and internal drainage. Ninety-six cases of MOJ were divided into two groups according to the different ways of biliary drainage. Fifty-two external drainage tubes were placed in 41 cases of percutaneous transhepatic biliary external drainage group and 66 metal stents were placed in 55 cases of percutaneous transhepatic biliary internal drainage group. Liver function, serum TNF- and cellular function were examined one day before operation and one week after operation and liver function was re-examined two weeks after operation, in order to observe the change and analyze the asso ciation among them and compare with the control group. All patients conditions were improved after operation. In the percutaneous transhepatic biliary external and internal drainage groups, the total level of bilirubin decreased from (343.54±105.56) μ mol/L and (321.19±110.50) μ mol/L to (290.56±103.46) μ mol/L and (283.72±104.95) μ mol/L after operation respectively, which were significantly lower than pre-operation (<0.05), but there was no significant difference between the two groups (>0.05). Serum alanine aminotransferase (ALT) of all patients one week after operation was significantly lower than that before operation. TNF- in percutaneous transhepatic biliary external and internal groups decreased from (108.58±19.95) pg/mL, (109.98±16.24) pg/mL of pre-operation to (104.32±19.59) pg/mL, (83.92±13.43) pg/mL of post-operation respectively, there was notable improvement (<0.01) in internal drainage group after operation. Patients serum CD4, CD3 and CD4/CD8 were notably increased, but CD8 was notably decreased (<0.05). There was no difference in external drainage group (>0.05). There was a significant difference between the two groups. Serum TNF- and ALT had positive correlation. Percutaneous transhepatic biliary internal or external drainage was an effective and important method to treat MOJ. Patients immune function was weak when they suffered MOJ, but body s cellular immune function can be notably improved after internal biliary drainage.

Insult of gastroesophageal reflux on airway: clinical significance of pharyngeal nozzle

null

《医学前沿(英文)》 2015年 第9卷 第1期   页码 117-122 doi: 10.1007/s11684-014-0343-1

摘要:

At the very time of global paying the highest attention to the worst insults of smoking as well as haze on the airway, everybody knows both are exogenous and noticeable. However, people mostly, including many medical personnel, do not know how badly the gastroesophageal reflux (GER) insults on our own airway. Symptoms of GER are commonly seen as heartburn and regurgitation, which can be mostly tolerated. However, when the up going gastric content reversely passes the esophagus and then the distal pharynx, where it appears a beak like stricture, serving as a nozzle, so as to produce numerous micro-particles and reach the oro-nasal cavity and also the airway causing allergic rhinitis and asthmatic attacks, even pulmonary parenchyma lesions. It will reduce life quality or even jeopardize life. The point that the endogenous insult appears in the respiratory system, but originates from the digestive tract is not well known and often undiagnosed and not correctly treated. The GER induced airway challenge is a treatable and preventive entity, as soon as a diagnosis is made, a good relief could be expected by means of life style adjustment, medicine, or fixation of the patulous cardia through radiofrequency or fundoplication. The author Dr. Zhonggao Wang had suffered it for long and symptoms disappeared for 8 years after anti-reflux surgery. Here is a presentation of Dr. Zhonggao Wang and his team’s work and would call attention to the public so as to recognize this relatively unknown entity — a treatable condition occurring from human itself, but not from outside surroundings as smoking or haze does.

关键词: gastroesophageal reflux     airway     pharyngeal nozzle     micro-aspiration     asthma    

Scientific significance of ancient maps of Yellow River and Grand Canal for water conservancy in China

Xiaocong LI,

《结构与土木工程前沿(英文)》 2009年 第3卷 第4期   页码 445-454 doi: 10.1007/s11709-009-0063-9

摘要: Based on the study of ancient maps preserved in China and abroad, the systematic nature and practical meaning of the maps of the Yellow River and Grand Canal is demonstrated. It is pointed out that the ancient maps not only record the spatial information of the established water conservancy engineering for river harnessing but also the management systems of the rivers in history. Besides, the maps provide abundant information on nature, humanity, and geography and possess high value in academic research and art appreciation.

关键词: information     management     established     appreciation     practical    

Clinical significance of human papilloma virus infection in the cervical lesions

Shuang LI, Yu-Han MENG, Hu TING, Jian SHEN, Ding MA

《医学前沿(英文)》 2010年 第4卷 第3期   页码 264-270 doi: 10.1007/s11684-010-0094-6

摘要: Cervical lesions have been regarded as the common and frequently occurring diseases in China. Recently, the morbidity and youth tendency of cervical cancer have gradually increased. Cervical cancer, related with human papilloma virus (HPV) infection, has been one of the severest diseases threatening health and life of women, and is an infectious disease. The universality of HPV infection in the reproductive tract should not be ignored. The well-known risk factors of HPV infection in cervical lesions consist of high-risk sexual behaviors, immunosuppression, age, contraceptive methods, the concurrent infection of other sexually transmitted diseases, etc. The variation of cervical lesions induced by HPV infection is involved in the continuous pathological process, including the subclinical, latent, and persistent infection of high risk (HR)-HPV, chronic cervicitis with abnormal results of cytological examination, cervical intraepithelial neoplasia (CIN), and cervical cancer. The outcome of patients with HPV infection is influenced by many factors, such as HPV subtype dominance, persistent HPV infection, HPV loading dose, and multiple HPV infection. Controlling HR-HPV persistent infection should be an important strategy for reducing cervical lesions.

关键词: cervical lesion     high risk-human papilloma virus     persistent infection     loading dose     cervical intraepithelial neoplasia     cervical cancer    

Increasing significance of advanced physical/chemical processes in the development and application of

RULKENS Wim

《环境科学与工程前沿(英文)》 2008年 第2卷 第4期   页码 385-396 doi: 10.1007/s11783-008-0073-1

摘要: The awareness of the problem of the scarcity of water of high quality has strongly changed the approach of wastewater treatment. Currently, there is an increasing need for the beneficial reuse of treated wastewater and to recover valuable products and energy from the wastewater. Because microbiological treatment methods are, only to a limited part, able to satisfy these needs, the role and significance of physical/chemical processes in wastewater treatment are gaining more and more interest. The specific future role and aim of the various physical/chemical treatment processes can be categorized in five groups: improvement of the performance of microbiological treatment processes, achievement of the high quality required for reuse of the effluent, recovery of valuable components and energy from the wastewater for beneficial reuse, desalination of brackish water and seawater, and treatment of concentrated liquid or solid waste residues produced in a wastewater treatment process. Development of more environmentally sustainable wastewater treatment chains in which physical/chemical processes play a crucial role, also requires application of process control and modeling strategies. This is briefly introduced by the elaboration of treatment scenarios for three specific wastewaters.

关键词: control     beneficial     valuable     scarcity     Development    

Significance of using isolated footing technique for residential construction on expansive soils

Harry FAR,Deacon FLINT

《结构与土木工程前沿(英文)》 2017年 第11卷 第1期   页码 123-129 doi: 10.1007/s11709-016-0372-8

摘要: Expansive soils cause problems with the founding of lightly loaded structures in many parts of the world. Foundation design for expansive soils is one of the most discussed and problematic issues in Australia as expansive soils were responsible for billions of dollars’ worth of damage to man-made structures such as buildings and roads. Several studies and reports indicate that one of the most common and least recognized problems causing severe structural damage to houses lies in expansive soils. In this study, a critical review has been carried out on the current Australian standards for building on expansive soils and they are compared with some techniques that are not included in the current Australian standards for residential slabs and footings. Based on the results of this review, the most effective and economical method has been proposed for construction of footings on all site classifications without restriction to 75mm of characteristic movement. In addition, it has become apparent that as design procedures for footings resting on sites with extreme characteristic movements are not included in the current Australian standards, there is a strong need for well-developed and simplified standard design procedures for characteristic soil movement of greater than 75mm to be included into the Australian Standards.

关键词: expansive soils     residential slabs     isolated footings     Australian Standards    

Role of the forkhead transcription factor FOXO-FOXM1 axis in cancer and drug resistance

null

《医学前沿(英文)》 2012年 第6卷 第4期   页码 376-380 doi: 10.1007/s11684-012-0228-0

摘要:

The forkhead transcription factors FOXO and FOXM1 have pivotal roles in tumorigenesis and in mediating chemotherapy sensitivity and resistance. Recent research shows that the forkhead transcription factor FOXM1 is a direct transcriptional target repressed by the forkhead protein FOXO3a, a vital downstream effector of the PI3K-AKT-FOXO signaling pathway. Intriguingly, FOXM1 and FOXO3a also compete for binding to the same gene targets, which have a role in chemotherapeutic drug action and sensitivity. An understanding of the role and regulation of the FOXO-FOXM1 axis will impact directly on our knowledge of chemotherapeutic drug action and resistance in patients, and provide new insights into the design of novel therapeutic strategy and reliable biomarkers for prediction of drug sensitivity.

关键词: FOXO3a     FOXM1     transcription factor     cancer     drug resistance     tumorigenesis    

Clinical significance of para-aortic lymph node dissection and prognosis in ovarian cancer

null

《医学前沿(英文)》 2014年 第8卷 第1期   页码 96-100 doi: 10.1007/s11684-014-0316-4

摘要:

Lymph node metastasis has an important effect on prognosis of patients with ovarian cancer. Moreover, the impact of para-aortic lymph node (PAN) removal on patient prognosis is still unclear. In this study, 80 patients were divided into groups A and B. Group A consisted of 30 patients who underwent PAN+ pelvic lymph node (PLN) dissection, whereas group B consisted of 50 patients who only underwent PLN dissection. Analysis of the correlation between PAN clearance and prognosis in epithelial ovarian cancer was conducted. Nineteen cases of lymph node metastasis were found in group A, among whom seven cases were positive for PAN, three cases for PLN, and nine cases for both PAN and PLN. In group B, 13 cases were positive for lymph node metastasis. Our study suggested that the metastatic rate of lymph node is 40.0%. Lymph node metastasis was significantly correlated with FIGO stage, tumor differentiation, and histological type both in groups A and B (P<0.05). In groups A and B, the three-year survival rates were 77.9% and 69.0%, and the five-year survival rates were 46.7% and 39.2%, respectively. However, the difference was not statistically significant (P>0.05). The three-year survival rates of PLN metastasis in groups A and B were 68.5% and 41.4%, and the five-year survival rates were 49.7% and 26.4%, respectively. Furthermore, PLN-positive patients who cleared PAN had significantly higher survival rate (P=0.044). In group A, the three-year survival rates of positive and negative lymph nodes were 43.5% and 72.7%, and the five-year survival rates were 27.2% and 58.5%, respectively. The difference was statistically significant (P=0.048). Cox model analysis of single factor suggested that lymph node status affected the survival rate (P<0.01), which was the death risk factor. Consequently, in ovarian carcinoma cytoreductive surgery, resection of the para-aortic lymph node, which has an important function in clinical treatment and prognosis of patients with ovarian cancer, is necessary.

关键词: ovarian cancer     para-aortic lymph node     pelvic lymph node    

关于子宫内膜异位症的再认识及其意义

郎景和

《中国工程科学》 2009年 第11卷 第10期   页码 137-142

摘要:

子宫内膜异位症是严重影响育龄妇女健康及生育的常见病、多发病。课题组在该病的基础与临床研究过程中,形成了独到的病因学观点。即认为,内异症是由异常的子宫在位内膜组织随经血逆流至盆腹腔,在异地完成粘附、侵袭、血管形成之病理过程,而形成病灶。致病的关键系子宫在位内膜本身,而在位内膜干/祖细胞或其微环境的改变可能是根本原因。此外,内异症还表现出类肿瘤特质。上述病因学研究结果推进了临床诊疗技术和水平。近年来在位内膜标志物的检测和局部治疗更反映了“源头”诊疗的新观念。对内异症发病机制的再认识和新观念,直接影响了临床问题解决的新方向。

关键词: 子宫内膜异位症     发病机制     诊断     治疗    

Effect of oxytocin on gastric ischemia-reperfusion injury in rats

ZHANG Wenwen, ZHANG Jianfu, ZHANG Yongmei, XU Ming

《医学前沿(英文)》 2007年 第1卷 第4期   页码 433-437 doi: 10.1007/s11684-007-0085-4

摘要: The effect of peripherally administered oxytocin (OT) on gastric ischemia-reperfusion injury (GI-RI) and its possible mechanism were investigated. The Sprague-Dawley (SD) rats were randomly divided into different treatment groups ( = 6). The animal GI-RI model was established by clamping the celiac artery for 30 min to induce ischemia and then released to allow reperfusion for 1 h, and the degree of GI-RI was assessed by scoring the gastric mucosal damage index (GMDI), the gastric fluid output, gastric fluid output, gastric acidity were measured and the surgical preparations of vagotomy and sympathectomy were used to investigate the possible mechanism of OT on GI-RI. The results were as follows. Compared with the control group (NS plus GI-R only, GMDI 121.33±10.40, = 6), the intra peritoneal (ip) administration of oxytocin (20, 100 μg/0.5 mL) obviously attenuated GI-RI (<0.05), GMDI were 82.33±14.26, 53.5±5.58 respectively ( = 6); the gastric fluid output and the gastric acidity (evaluated by pH) of the control group were (430.17±87.36) μL, 1.55±0.25 ( = 6), and those of the OT group were (102.45±48.00) μL, 2.65±0.40 ( = 6) res pectively; differences had statistical significance (<0.01). The effect of oxytocin was reversed by atosiban, a selective oxytocin receptor antagonist. The GMDI of the group given atosiban 10 min before OT was 138.17±24.06 ( = 6), which had no significant difference with the control group. Oxytocin further attenuated GI-RI after vagotomy and sympathectomy (GMDI 6.83±8.89, 29.67±5.54, = 6), compared with the GI-R group and the oxytocin group (<0.01). These results indicated that the oxytocin could significantly protect gastric mucosal against injury induced by ischemia-reperfusion, and the oxytocin receptor was involved. This effect of oxytocin may be mediated through the vagus and sympathetic nerve, and then lead to the reduction of gastric juice output and the depression of gastric acidity.

关键词: control     significant difference     surgical     statistical significance     Sprague-Dawley    

LSSVM-based approach for refining soil failure criteria and calculating safety factor of slopes

Shiguo XIAO; Shaohong LI

《结构与土木工程前沿(英文)》 2022年 第16卷 第7期   页码 871-881 doi: 10.1007/s11709-022-0863-8

摘要: The failure criteria of practical soil mass are very complex, and have significant influence on the safety factor of slope stability. The Coulomb strength criterion and the power-law failure criterion are classically simplified. Each one has limited applicability owing to the noticeable difference between calculated predictions and actual results in some cases. In the work reported here, an analysis method based on the least square support vector machine (LSSVM), a machine learning model, is purposefully provided to establish a complex nonlinear failure criterion via iteration computation based on strength test data of the soil, which is of more extensive applicability to many problems of slope stability. In particular, three evaluation indexes including coefficient of determination, mean absolute percentage error, and mean square error indicate that fitting precision of the machine learning-based failure criterion is better than those of the linear Coulomb criterion and nonlinear power-law criterion. Based on the proposed LSSVM approach to determine the failure criterion, the limit equilibrium method can be used to calculate the safety factor of three-dimensional slope stability. Analysis of results of the safety factor of two three-dimensional homogeneous slopes shows that the maximum relative errors between the proposed approach and the linear failure criterion-based method and the power-law failure criterion-based method are about 12% and 7%, respectively.

关键词: slope stability     safety factor     failure criterion     least square support vector machine    

lncR-GAS5 upregulates the splicing factor to impair endothelial autophagy, leading to atherogenesis

《医学前沿(英文)》 2023年 第17卷 第2期   页码 317-329 doi: 10.1007/s11684-022-0931-4

摘要: Long noncoding RNAs (lncRNAs) play a critical role in the regulation of atherosclerosis. Here, we investigated the role of the lncRNA growth arrest-specific 5 (lncR-GAS5) in atherogenesis. We found that the enforced expression of lncR-GAS5 contributed to the development of atherosclerosis, which presented as increased plaque size and reduced collagen content. Moreover, impaired autophagy was observed, as shown by a decreased LC3II/LC3I protein ratio and an elevated P62 level in lncR-GAS5-overexpressing human aortic endothelial cells. By contrast, lncR-GAS5 knockdown promoted autophagy. Moreover, serine/arginine-rich splicing factor 10 (SRSF10) knockdown increased the LC3II/LC3I ratio and decreased the P62 level, thus enhancing the formation of autophagic vacuoles, autolysosomes, and autophagosomes. Mechanistically, lncR-GAS5 regulated the downstream splicing factor SRSF10 to impair autophagy in the endothelium, which was reversed by the knockdown of SRSF10. Further results revealed that overexpression of the lncR-GAS5-targeted gene miR-193-5p promoted autophagy and autophagic vacuole accumulation by repressing its direct target gene, SRSF10. Notably, miR-193-5p overexpression decreased plaque size and increased collagen content. Altogether, these findings demonstrate that lncR-GAS5 partially contributes to atherogenesis and plaque instability by impairing endothelial autophagy. In conclusion, lncR-GAS5 overexpression arrested endothelial autophagy through the miR-193-5p/SRSF10 signaling pathway. Thus, miR-193-5p/SRSF10 may serve as a novel treatment target for atherosclerosis.

关键词: lncR-GAS5     miR-193-5p     splicing factor SRSF10     autophagy     atherogenesis    

标题 作者 时间 类型 操作

Environmental pollution and DNA methylation: carcinogenesis, clinical significance, and practical applications

null

期刊论文

Structural dimension optimization and mechanical response analysis of fabricated honeycomb plastic pavement slab

Zixuan CHEN; Tao LIU; Xiao MA; Hanyu TANG; Jianyou HUANG; Jianzhong PEI

期刊论文

Prognostic significance of clinicopathologic parameters in gastrointestinal stromal tumors: a study of

LIANG Yumei, LI Xianghong, LU Youyong, LV Yali, ZHONG Mei, PU Xiaolu, LI Wenmei

期刊论文

Change and significance of T-cell subsets and TNF-α in patients with advanced malignant obstructive jaundice

ZHU Lidong, CHEN Xiaoping

期刊论文

Insult of gastroesophageal reflux on airway: clinical significance of pharyngeal nozzle

null

期刊论文

Scientific significance of ancient maps of Yellow River and Grand Canal for water conservancy in China

Xiaocong LI,

期刊论文

Clinical significance of human papilloma virus infection in the cervical lesions

Shuang LI, Yu-Han MENG, Hu TING, Jian SHEN, Ding MA

期刊论文

Increasing significance of advanced physical/chemical processes in the development and application of

RULKENS Wim

期刊论文

Significance of using isolated footing technique for residential construction on expansive soils

Harry FAR,Deacon FLINT

期刊论文

Role of the forkhead transcription factor FOXO-FOXM1 axis in cancer and drug resistance

null

期刊论文

Clinical significance of para-aortic lymph node dissection and prognosis in ovarian cancer

null

期刊论文

关于子宫内膜异位症的再认识及其意义

郎景和

期刊论文

Effect of oxytocin on gastric ischemia-reperfusion injury in rats

ZHANG Wenwen, ZHANG Jianfu, ZHANG Yongmei, XU Ming

期刊论文

LSSVM-based approach for refining soil failure criteria and calculating safety factor of slopes

Shiguo XIAO; Shaohong LI

期刊论文

lncR-GAS5 upregulates the splicing factor to impair endothelial autophagy, leading to atherogenesis

期刊论文