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Assessment of Benchmark Dose in BEAS-2B Cells by Evaluating the Cell Relative Viability with Particulates in Motorcycle Exhaust via the Air-liquid Interface Exposure

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Biomedical and Environmental Sciences 2021年第4期34卷 272-281页

作者： YU Tao ZHANG Xue Yan LI Shu Fei ZHOU Yu Mei LI bin WANG Zhong Xu DAI Yu Fei ADAMSON Sherleen Xue-Fu ZHENG Yu Xin bin ping National Institute of Occupational Health and Poison Control Chinese Center for Disease Control and PreventionBeijing 100050China Tianjin Center for Diseases Prevention and Control Tianjin 300011China School of Health Sciences Purdue UniversityWest Lafayette 47907Indiana USA School of Public Health Qingdao UniversityQingdao 266021ShandongChina

Objective This study aimed to use an air-liquid interface(ALI)exposure system to simulate the inhalation exposure of motorcycle exhaust particulates(MEPs)and then investigate the benchmark dose(BMD)of MEPs by evaluating cell relative viability(CRV)in lung epithelial BEAS-2B cells.Methods The MEPs dose was characterized by measuring the number concentration(NC),surface area concentration(SAC),and mass concentration(MC).BEAS-2B cells were exposed to MEPs at different concentrations via ALI and CRV was determined using Cell Counting Kit(CCK-8)assay.BMD software was applied to calculate BMD and the lower limit of benchmark dose(BMDL)according to Akaike Information Coefficient(AIC),with P-value based on Hill,Linear,Polynomial,and Power model.Results Our results reveal that BMD of NC and SAC were estimated by the best-fitting Hill model,while MC was estimated by Polynomial model.The BMDL for CRV following ALI exposure to MEPs were as follows:364.2#/cm^(3)for NC;0.662×10^(7)nm^(2)/cm^(3)for SAC;and 0.278μg/m^(3)for MC.Conclusion These results indicate that MEPs exposure via ALI system induces a dose-dependent decrease of CRV and provides the potential exposure threshold of MEPs in a lung cell model.

关键词： Motorcycle exhaust particulates Air-liquid interface Bronchial epithelial cells Cell relative viability Dose-dependent effect

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齿垢密螺旋体与慢性牙周炎关系的研究进展

口腔颌面修复学杂志 2024年第3期25卷 223-227页

作者：符静王彬娉海南省口腔医学中心口腔牙周病科·中南大学湘雅医学院附属海口医院海口570208 海南省口腔医学中心口腔综合科·中南大学湘雅医学院附属海口医院海口570208

齿垢密螺旋体(Treponema denticola,Td)是一种革兰氏阴性厌氧菌,属解糖密螺旋体。慢性牙周炎(chronic periodontitis,CP)是一种由细菌侵犯牙周组织而引起的慢性炎症,细菌是CP发生发展的始动因子,堆积在牙面及龈沟内的细菌及其产物会诱... 详细信息

齿垢密螺旋体(Treponema denticola,Td)是一种革兰氏阴性厌氧菌,属解糖密螺旋体。慢性牙周炎(chronic periodontitis,CP)是一种由细菌侵犯牙周组织而引起的慢性炎症,细菌是CP发生发展的始动因子,堆积在牙面及龈沟内的细菌及其产物会诱发炎症反应,为细菌的繁殖提供有利条件,使细菌进一步向龈下扩展,从而破坏牙周组织。Td被认作中等证据的牙周致病菌,其在正常牙周组织中检出率较低,但在CP患者中检测率高,且与牙周袋深度和探诊出血程度密切相关,在CP的发生发展中扮演着重要角色。由于Td在形态学特征上与其他牙周致病菌有明显区别,故本文就Td的生物学特征、在CP中的致病情况、检测情况及治疗情况的研究做一综述。

关键词：齿垢密螺旋体慢性牙周炎生物学特征致病菌

Myelin protein zero and its antibody in serum as biomarkers of n-hexane-induced peripheral neuropathy and neurotoxicity effects

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Chinese Medical Journal 2014年第8期127卷 1536-1540页

作者： Jia Xiaowei Liu Qingjun Zhang Yanshu Dai Yufei Duan Huawei bin ping Niu Yong Liu Jie Zhong Liuzhen Guo Jisheng Liu Xiaofeng Zheng Yuxin Key Laboratory of Chemical Safety and Health National Institute for Occupational Health and Poison Control Chinese Center for Disease Control and Prevention Beijing 100050 China DSM Regulatory Affairs Depart-ment DSM (China) Ltd. Beijing 100000 China College of Public Health Hebei United University Tangshan Hebei 063009 China Suzhou Fifth People's Hospital Suzhou Jiangsu 215007 China Xixiang Health Inspection of Bao'an Distract Shenzhen Guangzhou Guangdong 500000 China

Background Chronic exposure to n-hexane can lead to peripheral neuropathy that no effective treatment regimen could be applied presently. This study investigated whether myelin protein zero （P0） protein and its antibody could be used to distinguish n-hexane intoxication and protect workers from peripheral neuropathy. Methods We compared P0 protein and its antibody among three levels of n-hexane-exposed groups, which included 18 patients with n-hexane-induced peripheral neuropathy as case group, 120 n-hexane-exposed workers as n-hexane- exposed control group, and 147 non-hexane-exposed participants used as control group. ELISA method was applied to detect P0 protein and its antibody. Results P0 protein in serum was significantly higher in the case group and n-hexane-exposed control group in comparison with the control group （P〈0.01）. Compared with the n-hexane-exposed control group, the case group also had significant increase of P0 protein （P〈0.01）. After 6 months therapy, P0 protein was observed to decrease significantly in the case group （P〈0.01）. The P0 antibody in serum was significantly higher in the n-hexane-exposed control group than in the control group （P〈0.01）, but not significantly different between cases and controls. Conclusions P0 antibodies in serum may be a short-term effect biomarker for n-hexane exposure. P0 protein in serum may be an early effective biomarker for peripheral nerve neuropathy and its biological limit value needs investigation in the future study.

关键词： n-hexane marker peripheral neuropathy myelin protein zero

破骨细胞与糖尿病相关慢性牙周炎关系的研究进展

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口腔颌面修复学杂志 2024年第1期25卷 64-67页

作者：陈奕苗王彬娉海南省口腔医学中心口腔牙周病科·中南大学湘雅医学院附属海口医院海口570208 海南省口腔医学中心口腔综合科·中南大学湘雅医学院附属海口医院海口570208

糖尿病是慢性牙周炎(chronic periodontitis,CP)发生的危险因素,糖尿病患者长期高血糖会使机体产生大量高级糖基化终产物(advanced glycosylation end products,AGEs),通过氧化应激、细胞信号传导等途径将机体固有免疫系统激活,进而增... 详细信息

糖尿病是慢性牙周炎(chronic periodontitis,CP)发生的危险因素,糖尿病患者长期高血糖会使机体产生大量高级糖基化终产物(advanced glycosylation end products,AGEs),通过氧化应激、细胞信号传导等途径将机体固有免疫系统激活,进而增强牙周组织的炎症反应,导致糖尿病相关性CP发生。破骨细胞(osteoclasts,OC)主要参与骨改建及骨吸收过程,对于维持人体骨组织稳态具有重要作用。OC与CP患者牙槽骨吸收密切相关,但与糖尿病相关CP的关系尚不明确。本文基于糖尿病相关CP发病机制,从炎症反应、AGEs、活性氧(reactive oxygen species,ROS)三个方面阐述OC与糖尿病相关CP的潜在关系,并做一综述。

关键词：糖尿病慢性牙周炎破骨细胞

Photosynthetic response dynamics in the invasive species Tithonia diversifolia and two co-occurring native shrub species under fluctuating light conditions

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Plant Diversity 2024年第2期46卷 265-273页

作者： Ju Li Shu-bin Zhang Yang-ping Li CAS Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglunMengla 666303YunnanChina University of Chinese Academy of Sciences Beijing 100049China

To determine the invasiveness of invasive plants,many studies have compared photosynthetic traits or strategies between invasive and native species.However,few studies have compared the photosynthetic dynamics between invasive and native species during light fluctuations.We compared photosynthetic induction,relaxation dynamics and leaf traits between the invasive species,Tithonia diversifolia and two native species,Clerodendrum bungei and Blumea balsamifera,in full-sun and shady habitats.The photosynthetic dynamics and leaf traits differed among species.T.diversifolia showed a slower induction speed and stomatal opening response but had higher average intrinsic water-use efficiency than the two native species in full-sun habitats.Thus,the slow induction response may be attributed to the longer stomatal length in T.diversifolia.Habitat had a significant effect on photosynthetic dynamics in T.diversifolia and B.balsamifera but not in C.bungei.In shady habitat,T.diversifolia had a faster photosynthetic induction response than in full-sun habitat,leading to a higher average stomatal conductance during photosynthetic induction in T.diversifolia than in the two native species.In contrast,B.balsamifera had a larger stomatal length and slower photosynthetic induction and relaxation response in shady habitat than in full-sun habitat,resulting in higher carbon gain during photosynthetic relaxation.Nevertheless,in both habitats,T.diversifolia had an overall higher carbon gain during light fluctuations than the two native species.Our results indicated that T.diversifolia can adopt more effective response strategies under fluctuating light environments to maximize carbon gain,which may contribute to its successful invasion.

关键词： Invasive plant Photosynthetic induction Photosynthetic relaxation Carbon gain Stomatal traits Tithonia diversifolia

Cell fate regulation governed by p53: Friends or reversible foes in cancer therapy

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Cancer Communications 2024年第3期44卷 297-360页

作者： bin Song ping Yang Shuyu Zhang Laboratory of Radiation Medicine West China Second University HospitalSichuan UniversityChengduSichuanP.R.China The Second Affiliated Hospital of Chengdu Medical College China National Nuclear Corporation 416 HospitalChengduSichuanP.R.China Laboratory of Radiation Medicine NHC Key Laboratory of Nuclear Technology Medical TransformationWest China School of Basic Medical Sciences&Forensic MedicineSichuan UniversityChengduSichuanP.R.China

Cancer is a leading cause of death worldwide.Targeted therapies aimed at key oncogenic driver mutations in combination with chemotherapy and radiother-apy as well as immunotherapy have benefited cancer patients considerably.Tumor protein p53(TP53),a crucial tumor suppressor gene encoding p53,reg-ulates numerous downstream genes and cellular phenotypes in response to various stressors.The affected genes are involved in diverse processes,includ-ing cell cycle arrest,DNA repair,cellular senescence,metabolic homeostasis,apoptosis,and autophagy.However,accumulating recent studies have contin-ued to reveal novel and unexpected functions of p53 in governing the fate of tumors,for example,functions in ferroptosis,immunity,the tumor microenvi-ronment and microbiome metabolism.Among the possibilities,the evolutionary plasticity of p53 is the most controversial,partially due to the dizzying array of biological functions that have been attributed to different regulatory mechanisms of p53 signaling.Nearly 40 years after its discovery,this key tumor suppressor remains somewhat enigmatic.The intricate and diverse functions of p53 in reg-ulating cell fate during cancer treatment are only the tip of the iceberg with respect to its equally complicated structural biology,which has been painstak-ingly revealed.Additionally,TP53 mutation is one of the most significant genetic alterations in cancer,contributing to rapid cancer cell growth and tumor pro-gression.Here,we summarized recent advances that implicate altered p53 in modulating the response to various cancer therapies,including chemotherapy,radiotherapy,and immunotherapy.Furthermore,we also discussed potential strategies for targeting p53 as a therapeutic option for cancer.

关键词： cancer chemotherapy drug targeting immunotherapy p53 tumor suppressor

A novel stacking-based ensemble learning model for drilling efficiency prediction in earth-rock excavation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第12期23卷 1027-1046页

作者： Fei LV Jia YU Jun ZHANG Peng YU Da-wei TONG bin-ping WU State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300350China

Accurate prediction of drilling efficiency is critical for developing the earth-rock excavation schedule.The single machine learning(ML)prediction models usually suffer from problems including parameter sensitivity and overfitting.In addition,the influence of environmental and operational factors is often ignored.In response,a novel stacking-based ensemble learning method taking into account the combined effects of those factors is proposed.Through multiple comparison tests,four models,e Xtreme gradient boosting(XGBoost),random forest(RF),back propagation neural network(BPNN)as the base learners,and support vector regression(SVR)as the meta-learner,are selected for stacking.Furthermore,an improved cuckoo search optimization(ICSO)algorithm is developed for hyper-parameter optimization of the ensemble model.The application to a real-world project demonstrates that the proposed method outperforms the popular single ML method XGBoost and the ensemble model optimized by particle swarm optimization(PSO),with 16.43%and 4.88%improvements of mean absolute percentage error(MAPE),respectively.

关键词： Drilling efficiency Prediction Earth-rock excavation Stacking-based ensemble learning Improved cuckoo search optimization(ICSO)algorithm Comprehensive effects of various factors Hyper-parameter optimization

A case of solitary choroidal tuberculoma with highly positive tuberculin skin test and negative interferon gamma release assays

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International Journal of Ophthalmology(English edition) 2024年第5期17卷 969-972页

作者： Lin Zhou bin Hu Zhu-ping Xu Department of Ophthalmology Sichuan Provincial People’s HospitalUniversity of Electronic Science and Technology of ChinaChengdu 610072Sichuan ProvinceChina Department of Ophthalmology Chengdu Tianfu New District People’s HospitalChengdu 641400Sichuan ProvinceChina Department of Ophthalmology West China HospitalSichuan UniversityChengdu 610041Sichuan ProvinceChina

Dear Editor,Tuberculosis(TB)is an infectious disease which has been considered as a global public health emergency problem during the past 25y.The World Health Organization has estimated that approximately one-third of the world’s population are infected by TB.However,only 10%of patients with TB is symptomatic.TB can affect multiple organs throughout the body.Eighty percent of those infected are pulmonary TB.Ocular TB can occur with or without lung or other systemic TB.It is a rare extrapulmonary form of the disease and occupied about 3.5%–5%of all of the TB.It should not be disregarded as its potential influence on vision loss.The intraocular and/or extraocular structures could be impacted by ocular TB[1].Uvea was the most common affected structure[2].

关键词： organs ocular infected

气-液界面染毒系统中不同暴露流量对汽油发动机尾气致肺细胞氧化应激相关蛋白表达的影响

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环境卫生学杂志 2024年第5期14卷 367-377页

作者：李国梁鱼涛张雪艳裴梦娟晋瑜李斌宾萍中国疾病预防控制中心职业卫生与中毒控制所北京100050

目的采用气-液界面(air-liquid interface,ALI)培养和暴露系统,探索二轮摩托车来源的汽油发动机尾气(gasoline engine exhaust,GEE)对人肺细胞氧化应激相关蛋白表达的影响。方法实验分为空白对照组、洁净空气组、GEE组。除了空白对照组... 详细信息

目的采用气-液界面(air-liquid interface,ALI)培养和暴露系统,探索二轮摩托车来源的汽油发动机尾气(gasoline engine exhaust,GEE)对人肺细胞氧化应激相关蛋白表达的影响。方法实验分为空白对照组、洁净空气组、GEE组。除了空白对照组,其余各组采用气-液界面体外染毒技术,分别在暴露流量为10、15和25 mL/min,37℃水浴条件下,对生长在气-液界面插件多孔膜上的人支气管上皮细胞BEAS-2B和人肺癌A549细胞持续暴露60 min。利用Cell Counting Kit-8(CCK-8)法评价细胞相对存活率。采用2′,7′-二氯荧光黄双乙酸盐(2′,7′-dichloro-dihydro-fluoresceindiacetate,DCFH-DA)探针检测细胞内活性氧(reactive oxygen species,ROS)水平。Annexin V-FITC细胞凋亡检测试剂盒检测GEE对BEAS-2B和A549细胞凋亡及坏死率的影响。蛋白质免疫印迹法检测全细胞裂解物中核因子红细胞2相关因子2(nuclear factor erythroid-2-related factor 2,Nrf2)和血红素氧合酶1(heme oxygenase-1,HO-1)蛋白表达水平。结果在10、15和25 mL/min三种暴露流量下,随着暴露流量增大,GEE暴露组的2种细胞相对存活率逐渐降低、胞内ROS生成量和细胞凋亡率逐渐升高,且与洁净空气组相比,存在统计学上的显著性差异(P0.05)。结论GEE对肺细胞具有较强的急性毒性作用;GEE诱导的细胞存活率、胞内活性氧生成和细胞凋亡率的改变受暴露流量的显著影响。暴露流量对GEE诱导的BEAS-2B和A549细胞Nrf2蛋白表达的影响显著,而对HO-1蛋白表达影响不显著。

关键词：汽油发动机尾气气-液界面肺细胞毒性核因子红细胞2相关因子2(Nrf2) 血红素氧合酶1(HO-1)