1
|
Xu T, Li H, Dou P, Luo Y, Pu S, Mu H, Zhang Z, Feng D, Hu X, Wang T, Tan G, Chen C, Li H, Shi X, Hu C, Xu G. Concentric Hybrid Nanoelectrospray Ionization-Atmospheric Pressure Chemical Ionization Source for High-Coverage Mass Spectrometry Analysis of Single-Cell Metabolomics. Adv Sci (Weinh) 2024; 11:e2306659. [PMID: 38359005 DOI: 10.1002/advs.202306659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 02/04/2024] [Indexed: 02/17/2024]
Abstract
High-coverage mass spectrometry analysis of single-cell metabolomics remains challenging due to the extremely low abundance and wide polarity of metabolites and ultra-small volume in single cells. Herein, a novel concentric hybrid ionization source, nanoelectrospray ionization-atmospheric pressure chemical ionization (nanoESI-APCI), is ingeniously designed to detect polar and nonpolar metabolites simultaneously in single cells. The source is constructed by inserting a pulled glass capillary coaxially into a glass tube that acts as a dielectric barrier layer. Benefitting from the integrated advantages of nanoESI and APCI, its limit of detection is improved by one order of magnitude to 10 pg mL-1. After the operational parameter optimization, 254 metabolites detected in nanoESI-APCI are tentatively identified from a single cell, and 82 more than those in nanoESI. The developed nanoESI-APCI is successively applied to study the metabolic heterogeneity of human hepatocellular carcinoma tissue microenvironment united with laser capture microdissection (LCM), the discrimination of cancer cell types and subtypes, the metabolic perturbations to glucose starvation in MCF7 cells and the metabolic regulation of cancer stem cells. These results demonstrated that the nanoESI-APCI not only opens a new avenue for high-coverage and high-sensitivity metabolomics analysis of single cell, but also facilitates spatially resolved metabolomics study coupled with LCM.
Collapse
Affiliation(s)
- Tianrun Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Hang Li
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Peng Dou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Yuanyuan Luo
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Siming Pu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Hua Mu
- The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, 116023, P. R. China
| | - Zhihao Zhang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Science, Dalian Key Laboratory for Online Analytical Instrumentation, Dalian, Liaoning, 116023, P. R. China
| | - Disheng Feng
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Xuesen Hu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Ting Wang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Guang Tan
- The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, 116023, P. R. China
| | - Chuang Chen
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Science, Dalian Key Laboratory for Online Analytical Instrumentation, Dalian, Liaoning, 116023, P. R. China
| | - Haiyang Li
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Science, Dalian Key Laboratory for Online Analytical Instrumentation, Dalian, Liaoning, 116023, P. R. China
| | - Xianzhe Shi
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Chunxiu Hu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| | - Guowang Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), University of Chinese Academy of Sciences, Liaoning Province Key Laboratory of Metabolomics, Dalian, Liaoning, 116023, P. R. China
| |
Collapse
|
2
|
Zhong X, Pan Y, Wu K, Wang L, Dou P, Tan P, Zhang P, Li X. A novel nomogram based on body composition and nutritional indicators to predict the prognosis of patients with muscle-invasive bladder cancer undergoing radical cystectomy. Cancer Med 2023; 12:21627-21638. [PMID: 37975152 PMCID: PMC10757150 DOI: 10.1002/cam4.6712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 11/01/2023] [Accepted: 11/06/2023] [Indexed: 11/19/2023] Open
Abstract
OBJECTIVE To investigate the prognostic significance of body composition and nutritional indicators in patients undergoing radical cystectomy with muscle-invasive bladder cancer (MIBC) and to develop a novel nomogram that accurately predicts overall survival (OS). METHODS From December 2010 to December 2020, we retrospectively collected clinical and pathological data from 373 MIBC patients who underwent radical cystectomy at our hospital. Preoperative computed tomography (CT) images were used to measure the skeletal muscle index (SMI), subcutaneous adipose index (SAI), visceral adipose index (VAI), skeletal muscle density (SMD), subcutaneous adipose density (SAD), visceral adipose density (VAD), and visceral adipose to subcutaneous adipose area ratio (VSR). The clinicopathological characteristics were evaluated using LASSO regression and multivariate Cox regression, and a nomogram was constructed to predict 1-, 3-, and 5-year overall survival. The concordance index (C-index), time-dependent receiver operating characteristic curves (t-ROC), calibration curve, and decision curve analysis (DCA) were used to assess the discriminative ability, calibration, and clinical practicality of the nomogram. RESULTS Multivariate analyses demonstrated that pT stage, lymph node status, LVI, SMD, and prognostic nutritional index (PNI) are independent prognostic factors for OS. Additionally, a nomogram was created. The nomogram's C-index was 0.714 (95% CI: 0.695-0.733). The area under the t-ROC curve of 1-, 3-, and 5-year survival corresponding to the model was 0.726, 0.788, and 0.785, respectively. The calibration curve demonstrated excellent agreement between the predicted and observed outcomes. The DCA revealed that patients with MIBC could benefit from the nomogram. CONCLUSION Based on body composition and nutritional indicators, we developed a novel nomogram with excellent predictive accuracy and reliability for predicting the prognosis of MIBC patients undergoing RC.
Collapse
Affiliation(s)
- Xin Zhong
- Department of UrologyInstitute of Urology, West China Hospital of Sichuan UniversityChengduSichuanChina
| | - Yunzhe Pan
- Department of UrologyChengdu Second People's HospitalChengduSichuanChina
| | - Kang Wu
- Department of UrologyInstitute of Urology, West China Hospital of Sichuan UniversityChengduSichuanChina
| | - Langkun Wang
- Department of UrologyInstitute of Urology, West China Hospital of Sichuan UniversityChengduSichuanChina
| | - Peng Dou
- Department of UrologyInstitute of Urology, West China Hospital of Sichuan UniversityChengduSichuanChina
| | - Ping Tan
- Department of UrologyInstitute of Urology, West China Hospital of Sichuan UniversityChengduSichuanChina
| | - Peng Zhang
- Department of UrologyInstitute of Urology, West China Hospital of Sichuan UniversityChengduSichuanChina
| | - Xiang Li
- Department of UrologyInstitute of Urology, West China Hospital of Sichuan UniversityChengduSichuanChina
| |
Collapse
|
3
|
Liu X, Xiao C, Guan P, Chen Q, You L, Kong H, Qin W, Dou P, Li Q, Li Y, Jiao Y, Zhong Z, Yang J, Wang X, Wang Q, Zhao J, Xu Z, Zhang H, Li R, Gao P, Xu G. Metabolomics acts as a powerful tool for comprehensively evaluating vaccines approved under emergency: a CoronaVac retrospective study. Front Immunol 2023; 14:1168308. [PMID: 37520533 PMCID: PMC10375237 DOI: 10.3389/fimmu.2023.1168308] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2023] [Accepted: 06/26/2023] [Indexed: 08/01/2023] Open
Abstract
Introduction To control the COVID-19 pandemic, great efforts have been made to realize herd immunity by vaccination since 2020. Unfortunately, most of the vaccines against COVID-19 were approved in emergency without a full-cycle and comprehensive evaluation process as recommended to the previous vaccines. Metabolome has a close tie with the phenotype and can sensitively reflect the responses to stimuli, rendering metabolomic analysis have the potential to appraise and monitor vaccine effects authentically. Methods In this study, a retrospective study was carried out for 330 Chinese volunteers receiving recommended two-dose CoronaVac, a vaccine approved in emergency in 2020. Venous blood was sampled before and after vaccination at 5 separate time points for all the recipients. Routine clinical laboratory analysis, metabolomic and lipidomic analysis data were collected. Results and discussion It was found that the serum antibody-positive rate of this population was around 81.82%. Most of the laboratory parameters were slightly perturbated within the relevant reference intervals after vaccination. The metabolomic and lipidomic analyses showed that the metabolic shift after inoculation was mainly in the glycolysis, tricarboxylic acid cycle, amino acid metabolism, urea cycle, as well as microbe-related metabolism (bile acid metabolism, tryptophan metabolism and phenylalanine metabolism). Time-course metabolome changes were found in parallel with the progress of immunity establishment and peripheral immune cell counting fluctuation, proving metabolomics analysis was an applicable solution to evaluate immune effects complementary to traditional antibody detection. Taurocholic acid, lysophosphatidylcholine 16:0 sn-1, glutamic acid, and phenylalanine were defined as valuable metabolite markers to indicate the establishment of immunity after vaccination. Integrated with the traditional laboratory analysis, this study provided a feasible metabolomics-based solution to relatively comprehensively evaluate vaccines approved under emergency.
Collapse
Affiliation(s)
- Xinyu Liu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
| | - Congshu Xiao
- Department of Infection, The Second Hospital of Dalian Medical University, Dalian, China
| | - Pengwei Guan
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Qianqian Chen
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
| | - Lei You
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Hongwei Kong
- Hangzhou Health-Bank Medical Laboratory Co., Ltd., Hangzhou, China
| | - Wangshu Qin
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
| | - Peng Dou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
| | - Qi Li
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
| | - Yanju Li
- Clinical laboratory, Affiliated Dalian Hospital of Shengjing Hospital of Chinese Medical University, Dalian, China
| | - Ying Jiao
- Nursing Department, Anshan Infectious Disease Hospital, Anshan, China
| | - Zhiwei Zhong
- Department of Infection, The Second Hospital of Dalian Medical University, Dalian, China
| | - Jun Yang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Xiaolin Wang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
| | - Qingqing Wang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Jinhui Zhao
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
- University of Chinese Academy of Sciences, Beijing, China
| | - Zhiliang Xu
- Hangzhou Health-Bank Medical Laboratory Co., Ltd., Hangzhou, China
| | - Hong Zhang
- Internal Department, Women and Children’s Hospital of Anshan City, Anshan, China
| | - Rongkuan Li
- Department of Infection, The Second Hospital of Dalian Medical University, Dalian, China
| | - Peng Gao
- Clinical laboratory, The Second Hospital of Dalian Medical University, Dalian, China
- Shanghai Institute for Biomedical and Pharmaceutical Technologies, Shanghai, China
| | - Guowang Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian, China
- University of Chinese Academy of Sciences, Beijing, China
| |
Collapse
|
4
|
Lu X, Dou P, Li C, Zheng F, Zhou L, Xie X, Wang Z, Xu G. Annotation of Dipeptides and Tripeptides Derivatized via Dansylation Based on Liquid Chromatography-Mass Spectrometry and Iterative Quantitative Structure Retention Relationship. J Proteome Res 2023. [PMID: 37163573 DOI: 10.1021/acs.jproteome.3c00002] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Small peptides such as dipeptides and tripeptides show various biological activities in organisms. However, methods for identifying dipeptides/tripeptides from complex biological samples are lacking. Here, an annotation strategy involving the derivatization of dipeptides and tripeptides via dansylation was suggested based on liquid chromatography-mass spectrometry (LC-MS) and iterative quantitative structure retention relationship (QSRR) to choose dipeptides/tripeptides by using a small number of standards. First, the LC-autoMS/MS method and initial QSRR model were built based on 25 selected grid-dipeptides and 18 test-dipeptides. To achieve high-coverage detection, dipeptide/tripeptide pools containing abundant dipeptides/tripeptides were then obtained from four dansylated biological samples including serum, tissue, feces, and soybean paste by using the parameter-optimized LC-autoMS/MS method. The QSRR model was further optimized through an iterative train-by-pick strategy. Based on the specific fragments and tR tolerances, 198 dipeptides and 149 tripeptides were annotated. The dipeptides at lower annotation levels were verified by using authentic standards and grid-correlation analysis. Finally, variation in serum dipeptides/tripeptides of three different liver diseases including hepatitis B infection, liver cirrhosis, and hepatocellular carcinoma was characterized. Dipeptides with N-prolinyl, C-proline, N-glutamyl, and N-valinyl generally increased with disease severity. In conclusion, this study provides an efficient strategy for annotating dipeptides/tripeptides from complex samples.
Collapse
Affiliation(s)
- Xin Lu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian 116031, China
| | - Peng Dou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian 116031, China
| | - Chao Li
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- School of Computer Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Fujian Zheng
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lina Zhou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian 116031, China
| | - Xiaoyu Xie
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), Key Laboratory of Phytochemical R&D of Hunan Province, Hunan Normal University, Changsha 410081, China
| | - Zixuan Wang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guowang Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian 116031, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
5
|
Dou P, Zhang TT, Xu Y, Xue Q, Shang J, Yang XL. [Effects of three medical nutrition therapies for weight loss on metabolic parameters and androgen level in overweight/obese patients with polycystic ovary syndrome]. Zhonghua Yi Xue Za Zhi 2023; 103:1035-1041. [PMID: 37032153 DOI: 10.3760/cma.j.cn112137-20220930-02066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
Abstract
Objective: To investigate the effects of calorie-restricted diet (CRD), high protein diet (HPD), high protein, and high dietary fiber diet (HPD+HDF) on metabolic parameters and androgen level in overweight/obese patients with polycystic ovary syndrome(PCOS). Methods: Ninety overweight/obese patients with PCOS from Peking University First Hospital from October 2018 to February 2020 were given medical nutrition weight loss therapy for 8 weeks and were randomly divided into CRD group, HPD group, and HPD+HDF group, with 30 patients in each group. Body composition, insulin resistance, and androgen level were detected before and after weight loss, and the efficacy of three weight loss therapies was compared through variance analysis and Kruskal-Wallis H test. Results: Eight patients in CRD group quit because they could not strictly complete the follow-up, therefore at the end of weight loss, 22, 30, and 30 patients in CRD group, HPD group and HPD+HDF group, respectively, were included in the final analysis. The baseline ages of the three groups were (31±2) years, (32±5) years and (31±5) years, respectively (P=0.952). After weight loss, the relevant indicators in HPD group and HPD+HDF group decreased more than those in CRD group. The body weight of CRD group, HPD group and HPD+HDF group decreased by 4.20 (11.92, 1.80), 5.00 (5.10, 3.32) and 6.10 (8.10, 3.07) kg, respectively (P=0.038); BMI of the three groups decreased by 0.80 (1.70, 0.40), 0.90 (1.23, 0.50) and 2.20 (3.30, 1.12) kg/m2, respectively (P=0.002); homeostatic model assessment-insulin resistance(HOMA-IR) index decreased by 0.48(1.93, 0.05), 1.21(2.91, 0.18) and 1.22(1.75, 0.89), respectively (P=0.196); and free androgen index(FAI) decreased by 0.23(0.67, -0.04), 0.41(0.64, 0.30) and 0.44(0.63, 0.24), respectively (P=0.357). Conclusions: The three medical nutrition therapies can effectively reduce the weight of overweight/obese patients with PCOS, and improve insulin resistance and hyperandrogenism. Compared with CRD group, HPD group, and HPD+HDF group have better fat-reducing effect, and can better preserve muscle and basal metabolic rate while losing weight.
Collapse
Affiliation(s)
- P Dou
- Department of Clinical Nutrition, Peking University First Hospital, Beijing 100034, China
| | - T T Zhang
- Department of Endocrinology, Peking University First Hospital, Beijing 100034, China
| | - Y Xu
- Reproductive Medical Center of Obstetrics and Gynecology, Peking University First Hospital, Beijing 100034, China
| | - Q Xue
- Reproductive Medical Center of Obstetrics and Gynecology, Peking University First Hospital, Beijing 100034, China
| | - J Shang
- Reproductive Medical Center of Obstetrics and Gynecology, Peking University First Hospital, Beijing 100034, China
| | - X L Yang
- Reproductive Medical Center of Obstetrics and Gynecology, Peking University First Hospital, Beijing 100034, China
| |
Collapse
|
6
|
Wang Y, Dou P, You X, Liu Q, Fei Z, Chen X, Zhang Z, Tang J, Cui M, Qiao X. Naphthenic Acids Removal from Model Transformer Oil by Diethylamine Modified Resins. Molecules 2023; 28:molecules28062444. [PMID: 36985416 PMCID: PMC10054115 DOI: 10.3390/molecules28062444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 02/27/2023] [Accepted: 03/01/2023] [Indexed: 03/10/2023] Open
Abstract
Resins have enormous potential in the removal of naphthenic acids (NAs) from transformer oil due to their rich porosity and high mechanical and diversified functionality, whereas their poor adsorption capacity limits application. In this work, the polystyrene–diethylamine resin (PS−DEA−x) was prepared by grafting diethylamine (DEA) onto chloromethylated polystyrene (PS−Cl) resin to efficiently adsorb cyclopentane carboxylic acid from transformer oil for the first time. The characterization analysis results indicated that amine contents were significantly enhanced with the increase in DEA. Particularly, resin with a molar ratio of 1:5 depending on chloromethyl to DEA (PS−DEA−5) exhibited the highest amine contents and efficient adsorption of cyclopentane carboxylic acid (static adsorption capacity up to 110.0 mg/g), which was about 5 times higher than that of the pristine PS−Cl. The thermodynamic and kinetic studies showed that the adsorption behaviors could be well fitted to the Langmuir isotherm equation and pseudo−second−order rate equation. Moreover, it was found that 1 g of the PS−DEA−5 can decontaminate about 760 mL transformer oil to meet reuse standards by a continuous stream, indicating its potential application in industry.
Collapse
Affiliation(s)
- Yan Wang
- State Key Laboratory of Materials−Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Peng Dou
- Jiangsu Frontier Electric Technology Co., Ltd., Nanjing 211102, China
| | - Xiaofeng You
- State Key Laboratory of Materials−Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Qing Liu
- State Key Laboratory of Materials−Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
- Correspondence: (Q.L.); (X.Q.); Tel./Fax: +86-(25)-83587168 (Q.L.); +86-(25)-8317229 (X.Q.)
| | - Zhaoyang Fei
- State Key Laboratory of Materials−Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Xian Chen
- State Key Laboratory of Materials−Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Zhuxiu Zhang
- State Key Laboratory of Materials−Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Jihai Tang
- State Key Laboratory of Materials−Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Mifen Cui
- State Key Laboratory of Materials−Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Xu Qiao
- State Key Laboratory of Materials−Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
- Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing 211800, China
- Correspondence: (Q.L.); (X.Q.); Tel./Fax: +86-(25)-83587168 (Q.L.); +86-(25)-8317229 (X.Q.)
| |
Collapse
|
7
|
Dou P, Hu H. Complementary Attention Network for Weakly Supervised Temporal Action Localization. Neural Process Lett 2023. [DOI: 10.1007/s11063-023-11156-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
|
8
|
Li C, Dou P, Wang T, Lu X, Xu G, Lin X. Defining disease-related modules based on weighted miRNA synergistic network. Comput Biol Med 2023; 152:106382. [PMID: 36493730 DOI: 10.1016/j.compbiomed.2022.106382] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 11/04/2022] [Accepted: 11/28/2022] [Indexed: 11/30/2022]
Abstract
MicroRNAs (miRNAs) play an important role in the biological process. Their expression and functional changes have been observed in most cancers. Meanwhile, there exists cooperative regulation among miRNAs which is important for studying the mechanisms of complex post-transcriptional regulations. Hence, studying miRNA synergy and identifying miRNA synergistic modules can help understand the development and progression of complex diseases, such as cancers. This work studies miRNA synergy and proposes a new method for defining disease-related modules (DDRM) by combining the knowledge databases and miRNA data. DDRM measures the miRNA synergy not only by the co-regulating target subset but also by the non-common target set to construct the weighted miRNA synergistic network (WMSN). The experiments on twelve the cancer genome atlas (TCGA) datasets showed that the important modules identified by DDRM can well distinguish the cancer samples from the normal samples, and DDRM performed better than the previous method in most cases. An external dataset of prostate cancer was applied to validate the module biomarkers determined by DDRM on the prostate cancer data of TCGA. The area under the receiver operating characteristic curve (AUC) value is 0.92 and the performance is superior. Hence, combining the miRNA synergy networks from the knowledge databases and the miRNA data can determine the important functional modules related to diseases, which is of great significance to the study of disease mechanism.
Collapse
Affiliation(s)
- Chao Li
- School of Computer Science & Technology, Dalian University of Technology, 116024, Dalian, China; CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Peng Dou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Tianxiang Wang
- School of Computer Science & Technology, Dalian University of Technology, 116024, Dalian, China
| | - Xin Lu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China; Liaoning Province Key Laboratory of Metabolomics, Dalian, China
| | - Guowang Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China; Liaoning Province Key Laboratory of Metabolomics, Dalian, China
| | - Xiaohui Lin
- School of Computer Science & Technology, Dalian University of Technology, 116024, Dalian, China.
| |
Collapse
|
9
|
Wei Y, Dou P, Xu D, Zhang Y, Gao B. Microplastic reorganization in urban river before and after rainfall. Environ Pollut 2022; 314:120326. [PMID: 36195193 DOI: 10.1016/j.envpol.2022.120326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 08/30/2022] [Accepted: 09/28/2022] [Indexed: 06/16/2023]
Abstract
Microplastics (MPs) present in non-negligible amounts in urban environments, where urban rivers serve as important transport channels for MPs. However, the footprint of MPs in urban rivers under the influence of natural and anthropogenic factors is poorly understood. This study investigated the MPs organization, stability and pollution risk before and after rainfall in the Qing River, Beijing. Rainfall potentially diluted the MPs abundance, attributed to opening of barrages and increase of flow velocity. The proportion of small-sized MPs (SMPs, 48-300 μm) decreased slightly, whereas that of normal-sized MPs (NMPs, 300-1000 μm) and large-sized MPs (LMPs, > 1000 μm) increased. However, SMPs dominantly presented in the Qing River before and after rainfall. Polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), and polystyrene (PS) were main polymers observed in the Qing River. The proportions of PET and PS decreased, while PP and PE increased after rainfall. The main types of MPs introduced by stormwater were PP and PE. The elevated MP diversity integrated index after rain suggested that rainfall enriched the local sources of MPs. Rainfall reduced the stability and fragmentation of MPs owing to the introduction of large debris. NMPs and LMPs were susceptible to further fragmentation and downsizing, implying that MPs abundance in the Qing River tended to rise and SMPs might enriched. In addition, alteration of MPs fragmentation and stability reflected that the likely input source was wastewater treatment plant and atmospheric deposition before rainfall, whereas soil and road dust were possible sources after rainfall. The pollution risk assessment defined the MPs pollution risk of Qing River as low level and decreased after rainfall. This study demonstrated that rainfall substantially influences MPs organization in urban river and provided empirical support for MPs environmental behavior under influence of natural and anthropogenic factors.
Collapse
Affiliation(s)
- Yiting Wei
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China
| | - Peng Dou
- Beijing Water Science and Technology Institute, Beijing, 100048, China
| | - Dongyu Xu
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China
| | | | - Bo Gao
- State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China.
| |
Collapse
|
10
|
Chen K, Mao J, Liu H, Wang X, Dou P, Lu Y, Sun M, Shen L, Liu L. Screening of idiopathic epiretinal membrane using fundus images combined with blood oxygen saturation and vascular morphological features. Int Ophthalmol 2022; 43:1215-1228. [PMID: 36207566 PMCID: PMC9543935 DOI: 10.1007/s10792-022-02520-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 09/11/2022] [Indexed: 11/28/2022]
Abstract
PURPOSE To achieve an accurate diagnosis of idiopathic epiretinal membrane (iERM) through analyzing retinal blood vessel oxygen saturation (SO2) and vascular morphological features in fundus images. METHODS Dual-modal fundus camera was used to obtain color fundus image, 570-nm, and 610-nm images. As iERM affects the macular area, a macular-centered semicircle area as region of interest (MROI) was selected and analyzed SO2 and vascular morphologies in it. Eventually, random forest (RF) and support vector machine (SVM) were as classifiers to diagnose iERM patients. RESULTS The arterial and venous SO2 levels of the iERM group were significantly higher than that of the control group. There were significant differences in the vessel density and fractal dimension on the artery for vascular morphology, while the tortuosity had a significant difference in the vein. By feeding the SO2 and the vascular morphological features into classifiers, an accuracy of over 82% was obtained, which is significantly better than the two separate inputs for classification. CONCLUSION Significant differences in SO2 and vascular morphologies between control and iERM groups confirmed that the occurrence of iERM may affect blood supply and vascular structures. Benefiting from the dual-modal fundus camera and machine learning models, accurate judgments can be made on fundus images. Extensive experiments proved the importance of blood vessel SO2 and vascular morphologies for diagnosis, which is of great significance for clinical screening.
Collapse
Affiliation(s)
- Kun Chen
- School of Biomedical Engineering & Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, 215123, Jiangsu, China
| | - Jianbo Mao
- Eye Hospital of Wenzhou Medical University, Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China
| | - Hui Liu
- School of Biomedical Engineering & Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, 215123, Jiangsu, China
| | - Xiaona Wang
- The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang, China
| | - Peng Dou
- School of Biomedical Engineering & Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, 215123, Jiangsu, China
| | - Yu Lu
- Hefei Orbis Biotech, LTD, Hefei, Anhui, China
| | - Mingzhai Sun
- School of Biomedical Engineering & Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, 215123, Jiangsu, China
| | - Lijun Shen
- Eye Hospital of Wenzhou Medical University, Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China.
| | - Lei Liu
- School of Biomedical Engineering & Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, 215123, Jiangsu, China. .,Department of Precision Machinery and Instrumentation, University of Science and Technology of China, Hefei, 230022, China.
| |
Collapse
|
11
|
Li C, Dou P, Lu X, Guan P, Lin Z, Zhou Y, Lu X, Lin X, Xu G. Identification and Validation of TRIM25 as a Glucose Metabolism Regulator in Prostate Cancer. Int J Mol Sci 2022; 23:ijms23169325. [PMID: 36012594 PMCID: PMC9408812 DOI: 10.3390/ijms23169325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 08/10/2022] [Accepted: 08/16/2022] [Indexed: 11/16/2022] Open
Abstract
Prostate cancer (PCa) malignant progression is accompanied with the reprogramming of glucose metabolism. However, the genes involved in the regulation of glucose metabolism in PCa are not fully understood. Here, we propose a new method, DMRG, which constructs a weighted differential network (W-K-DN) to define the important metabolism-related genes. Based on biological knowledge and prostate cancer transcriptome data, a tripartite motif-containing 25 (TRIM25) was defined using DMRG; TRIM25 was involved in the regulation of glucose metabolism, which was verified by overexpressing or knocking down TRIM25 in PCa cell lines. Differential expression analysis of TCA cycle enzymes revealed that TRIM25 regulated isocitrate dehydrogenase 1 (IDH1) and fumarate hydratase (FH) expression. Moreover, a protein–RNA interaction network of TRIM25 revealed that TRIM25 interacted with RNA-binding proteins, including DExH-box helicase 9 and DEAD-box helicase 5, to play a role in regulating the RNA processing of metabolic enzymes, including IDH1 and FH. Furthermore, TRIM25 expression level was found to be positively correlated with Gleason scores in PCa patient tissues. In conclusion, this study provides a new method to define genes influencing tumor progression, and sheds light on the role of the defined TRIM25 in regulating glucose metabolism and promoting PCa malignancy.
Collapse
Affiliation(s)
- Chao Li
- School of Computer Science and Technology, Dalian University of Technology, Dalian 116024, China
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Peng Dou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xin Lu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Pengwei Guan
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Zhikun Lin
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yanyan Zhou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xin Lu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian 116023, China
- Correspondence: (X.L.); (G.X.)
| | - Xiaohui Lin
- School of Computer Science and Technology, Dalian University of Technology, Dalian 116024, China
| | - Guowang Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- Liaoning Province Key Laboratory of Metabolomics, Dalian 116023, China
- Correspondence: (X.L.); (G.X.)
| |
Collapse
|
12
|
Lu X, Dou P, Xie X, Wang X, Liu X, Hua R, Xu G. Development of a novel analytical method for inflammation and immunity-related metabolites in serum based on liquid chromatography tandem mass spectrometry. Talanta 2021; 234:122631. [PMID: 34364440 DOI: 10.1016/j.talanta.2021.122631] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 06/14/2021] [Accepted: 06/17/2021] [Indexed: 01/01/2023]
Abstract
Some metabolites have been found to play key roles in inflammation and immunity events that are associated with diseases such as cancer, diabetes and cytokine release syndrome. Characterization upon the inflammation and immunity-related metabolites (IIMs) will be helpful to the assessment of related pathological states. Although these metabolites have been partially reported in previous studies, the methods for specific measurement of them remain lacking. In the present study, a liquid chromatography - mass spectrometry based method was developed for the targeted analyses of 45 IIMs including amino acids, organic acids, phosphatidylcholines (PCs), polyunsaturated fatty acids and hormones selected based on the literature knowledge. Direct extraction with dansyl-chloride in acetonitrile was proved to be the most efficient and time-saving strategy, in which precipitation, extraction and derivatization were integrated. IIMs derivatized for 4 min and quenched for 2 min revealed the most comprehensive abundance. Based on the defined conditions, all the IIMs had a low limit of detection smaller than 1 ng/mL with the linear range greater than three orders of magnitude. The relative standard derivations of intra-day and inter-day precisions were ranged from 2.2% to 13.4% and 1.7% to 19.5%, respectively. The recovery rates and accuracy in low concentration were 98.9% ± 5.6% and 106.7% ± 11.6%, in medium concentration were 97.1% ± 6.8% and 106.9% ± 9.5%, and in high concentration were 98.4% ± 8.9% and 98.1% ± 8.1%, respectively. Matrix effect and stability were ranged from -37.8% to 35.6% and 2.9% to 14.2%, respectively. To show the usefulness of the method, serum IIMs in hepatitis B virus (HBV) infected patients and healthy subjects were determined and compared. Bile acids, lipoxygenase-mediated lipid mediators and non-enzymatic products showed global increases, whereas most of LysoPCs and cyclooxygenase-mediated prostaglandin D2 decreased in HBV serum samples. This study provided a robust approach for the characterization of IIMs.
Collapse
Affiliation(s)
- Xin Lu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Peng Dou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Xiaoyu Xie
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Xiaolin Wang
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Xinyu Liu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China
| | - Rui Hua
- Department of Hepatology, First Hospital, Jilin University, Changchun, Jilin, 130021, China.
| | - Guowang Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
| |
Collapse
|
13
|
Zhang X, Dou P, Akhtar ML, Liu F, Hu X, Yang L, Yang D, Zhang X, Li Y, Qiao S, Li K, Tang R, Zhan C, Ma Y, Cheng Q, Bai Y, Han F, Nie H, Li Y. NEU4 inhibits motility of HCC cells by cleaving sialic acids on CD44. Oncogene 2021; 40:5427-5440. [PMID: 34282273 DOI: 10.1038/s41388-021-01955-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 06/19/2021] [Accepted: 07/09/2021] [Indexed: 02/07/2023]
Abstract
Hepatocellular carcinoma (HCC) is an extremely metastatic tumor. Sialic acids (SAs) are associated with cancer development and metastasis. NEU4 is a sialidase that removes SAs from glycoconjugates, while the function of the NEU4 in HCC has not been clearly explored. In our research, we found the NEU4 expression was significantly down-regulated in HCC tissues, which was correlated with high grades and poor outcomes of HCC. The NEU4 expression could be regulated by histone acetylation. In the functional analysis of NEU4, the cell motility was inhibited when NEU4 was overexpressed, and restored when NEU4 expression was down-regulated. Similarly, NEU4 over-expressed HCC cells showed less metastasis in athymic nude mice. Further study revealed that NEU4 could inhibit cell migration by enzymatic decomposition of SAs. Our results verified a NEU4 active site (NEU4E235) and overexpressing inactivates NEU4E235A that weakens the inhibition ability to cell migration. Further, 70 kinds of specific interacting proteins of NEU4 including CD44 were identified through mass spectrum. Moreover, the α2,3-linked SAs on CD44 were decreased and the hyaluronic acid (HA) binding ability was increased when NEU4 over-expressed or activated. Additionally, the mutation of CD44 with six N-glycosylation sites showed less sensibility to NEU4 on cell migration compared with wild-type CD44. In summary, our results revealed the mechanism of low expression of NEU4 in HCC and its inhibitory effect on cell migration by removal of SAs on CD44, which may provide new treatment strategies to control the motility and metastasis of HCC.
Collapse
Affiliation(s)
- Xiaoqing Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Peng Dou
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Muhammad Luqman Akhtar
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Fei Liu
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Xibo Hu
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Lijun Yang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Depeng Yang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Xiaohan Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Yiqun Li
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Shupei Qiao
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Kai Li
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Ran Tang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Chao Zhan
- The third affiliated hospital, Harbin Medical University, Harbin, Heilongjiang Provence, China, 150006
| | - Yue Ma
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Qixiang Cheng
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Yan Bai
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Fang Han
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008
| | - Huan Nie
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008.
| | - Yu Li
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, Heilongjiang Provence, China, 150008.
| |
Collapse
|
14
|
Xu T, Li H, Feng D, Dou P, Shi X, Hu C, Xu G. Lipid Profiling of 20 Mammalian Cells by Capillary Microsampling Combined with High-Resolution Spectral Stitching Nanoelectrospray Ionization Direct-Infusion Mass Spectrometry. Anal Chem 2021; 93:10031-10038. [PMID: 34270220 DOI: 10.1021/acs.analchem.1c00373] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Studies of cellular metabolism can provide profound insights into the underlying molecular mechanisms and metabolic function. To date, the majority of cellular metabolism studies based on chromatography-mass spectrometry (MS) require population cells to obtain informative metabolome. These methods are not only time-consuming but also not suitable for amount-limited cell samples such as circulating tumor cells, stem cells, and neurons. Therefore, it is extremely essential to develop analytical methods enabling to detect metabolome from tens of cells in a high-throughput and high-sensitivity way. In this work, a novel platform for rapid and sensitive detection of lipidome in 20 mammalian cells was proposed using capillary microsampling combined with high-resolution spectral stitching nanoelectrospray ionization direct-infusion MS. It can be used to collect cells rapidly and accurately via the capillary microprobe, extract lipids directly in a 96-well plate using a spray solvent, and detect more than 500 lipids covering 19 lipid subclasses within 3 min. This novel platform was successfully applied to study the lipid features of different cancer cell types and subtypes as well as target cells from tissue samples. This study provides a strategy for determining the lipid species with rich information in tens of cells and demonstrates great potential for clinical applications.
Collapse
Affiliation(s)
- Tianrun Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hang Li
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Disheng Feng
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Peng Dou
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Xianzhe Shi
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Chunxiu Hu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Guowang Xu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| |
Collapse
|
15
|
Dou P, Li Y, Sun H, Xie W, Zhang X, Zhang X, Zhang D, Qiao S, Ci Y, Nie H, Han F, Li Y. C1orf109L binding DHX9 promotes DNA damage depended on the R-loop accumulation and enhances camptothecin chemosensitivity. Cell Prolif 2020; 53:e12875. [PMID: 32761833 PMCID: PMC7507383 DOI: 10.1111/cpr.12875] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/14/2020] [Accepted: 06/17/2020] [Indexed: 12/15/2022] Open
Abstract
Objectives R‐loop is a three‐stranded nucleic acid structure of RNA/DNA hybrid, which occurs naturally during transcription, and more R‐loop accumulation can trigger serious DNA damage. There has been increasing attention to the issue of R‐loop accumulation acted as a target for cancer therapy. However, the regulation of R‐loop‐associated proteins is poorly explored. Material and method Quantitative real‐time PCR and Western blot were used to measure the expression of C1orf109 in cell lines. In addition, C1orf109L (C1orf109 longest isoform) protein binding partner was identified and validated using immunoprecipitation‐mass spectrometric (IP‐MS) and immunoprecipitation assays. DNA‐RNA immunoprecipitation (DR‐IP) and immunofluorescence determined the C1orf109L location on R‐loop. R‐loop accumulation was determined by immunofluorescence. Cell cycle was determined by flow cytometry. Finally, time‐lapse assay and cell counting were conducted to determined cell survival in response to camptothecin (CPT). Results We found that C1orf109L could mediate cell cycle arrest in the G2/M phase and DNA damage depended on R‐loop accumulation. Meanwhile, C1orf109L could bind with DHX9 to trigger R‐loop accumulation. And C1orf109L was competitive with PARP1 binding to DHX9, which would block the function of DHX9‐PARP1 to prevent the R‐loop accumulation. Furthermore, C1orf109L could enhance the chemosensitivity of CPT, a chemotherapeutic drug capable of promoting R‐loop formation. Conclusions Our data demonstrate that C1orf109L triggers R‐loop accumulation and DNA damage to arrest cell cycle.
Collapse
Affiliation(s)
- Peng Dou
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Yiqun Li
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Haoxiu Sun
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Wanqiu Xie
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Xiaoqing Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Xiaohan Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Dandan Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Shupei Qiao
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Yanpeng Ci
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Huan Nie
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Fang Han
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| | - Yu Li
- School of Life Science and Technology, Harbin Institute of Technology, Harbin City, China
| |
Collapse
|
16
|
Gan C, Wen S, Liu Y, Wen W, Dou P, Su J, Luo X. Preparation of Si-SiO x nanoparticles from volatile residue produced by refining of silicon. Waste Manag 2019; 84:373-382. [PMID: 30471874 DOI: 10.1016/j.wasman.2018.11.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 11/06/2018] [Accepted: 11/18/2018] [Indexed: 06/09/2023]
Abstract
Residual Si was produced on a furnace wall when upgraded metallurgical grade Si was refined by electron beam melting. It was then recycled to prepare Si-SiOx nanoparticles with an average size of 100 nm by planetary ball milling. The obtained Si-SiOx nanoparticles mainly consist of amorphous Si, crystalline Si and amorphous SiOx, which was confirmed by XRD, FTIR, XPS and TEM. SiOx is mainly composed of SiO2 and SiO1.35. Distilled water used as a grinding aid not only enhances milling efficiency, but also plays a key role in obtaining SiOx. During refining of upgraded metallurgical grade Si, the deposition pattern of residual Si on furnace wall agrees with model of three-dimension growth. Growth of Si-SiOx nanoparticles is the mutual effect of distilled water and ball milling. Si-SiOx nanoparticles were doped into phenolic resin pyrolysis carbon as anode materials for lithium ion batteries, and 10% doping was observed to improve the specific capacity. After 500 cycles, specific capacity of delithiation remained around 550 mA h/g. It suggests the residual Si is a value-added by-product, and it can be recycled as anode materials for lithium ion batteries.
Collapse
Affiliation(s)
- Chuanhai Gan
- College of Materials, Xiamen University, Xiamen 361005, PR China
| | - Shutao Wen
- College of Materials, Xiamen University, Xiamen 361005, PR China
| | - Yingkuan Liu
- Ningxia Dongmeng Energy Co. Ltd., Yinchuan 750021, PR China
| | - Weidong Wen
- Ningxia Dongmeng Energy Co. Ltd., Yinchuan 750021, PR China
| | - Peng Dou
- Ningxia Dongmeng Energy Co. Ltd., Yinchuan 750021, PR China
| | - Jing Su
- Ningxia Dongmeng Energy Co. Ltd., Yinchuan 750021, PR China
| | - Xuetao Luo
- College of Materials, Xiamen University, Xiamen 361005, PR China.
| |
Collapse
|
17
|
Chen Y, Zhang H, Han F, Yue L, Qiao C, Zhang Y, Dou P, Liu W, Li Y. The depletion of MARVELD1 leads to murine placenta accreta via integrin β4-dependent trophoblast cell invasion. J Cell Physiol 2017; 233:2257-2269. [PMID: 28708243 DOI: 10.1002/jcp.26098] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 07/12/2017] [Indexed: 12/12/2022]
Abstract
The placenta is a remarkable organ, it serves as the interface between the mother and the fetus. Proper invasion of trophoblast cells is required for a successful pregnancy. Previous studies have found that the adhesion molecule integrin β4 plays important roles during trophoblast cell invasion. Here, we found that the overall birth rate of the MARVELD1 knockout mouse is much lower than that of the wild-type mouse (p < 0.001). In E18.5 MARVELD1 knockout mice, we observed an over-invasion of trophoblast cells, and indeed, the pregnant mice had a partial placenta accreta phenotype. The HTR8/SVneo cell line was used as an in vitro model to elucidate the underlying mechanisms of MARVELD1-mediated trophoblast invasion. We detected a diminished expression of integrin β4 upon the downregulation of MARVELD1 and enhanced migrate and invasive abilities of trophoblast cells both in vivo and in vitro. The integrin β4 rescue assay also supported the results. In conclusion, this study found that MARVELD1 mediated the invasion of trophoblast cells via regulating the expression of integrin β4 during placenta development.
Collapse
Affiliation(s)
- Yue Chen
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Hui Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Fang Han
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Lei Yue
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Chunxiao Qiao
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Yao Zhang
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Peng Dou
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Weizhe Liu
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| | - Yu Li
- School of Life Science and Technology, Harbin Institute of Technology, Harbin, China
| |
Collapse
|
18
|
Cao Z, Meng H, Dou P, Wang C, Zheng J, Xu X. Effects of solid polymer electrolyte coating on the composition and morphology of the solid electrolyte interphase on Sn anodes. J Solid State Electrochem 2016. [DOI: 10.1007/s10008-016-3440-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
19
|
Cao Z, Yang H, Dou P, Wang C, Zheng J, Xu X. Synthesis of three-dimensional hollow SnO 2 @PPy nanotube arrays via template-assisted method and chemical vapor-phase polymerization as high performance anodes for lithium-ion batteries. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.01.158] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
20
|
Zhu J, Jiang A, Shi Y, Fan X, Dou P, Ma D, Xu X. Hollow Sn–Ni nanoparticles coated with ion-conductive polyethylene oxide as anodes for lithium ion batteries with superior cycling stability. RSC Adv 2015. [DOI: 10.1039/c5ra02956b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A facile strategy is designed for the fabrication of hollow, Sn–Ni nanoparticles (NPs) surrounded by ion-conductive, polyethylene oxide (PEO) coating to address the structural and interfacial stability concerns facing Sn-based anodes.
Collapse
Affiliation(s)
- Jin Zhu
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Anni Jiang
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Yongqian Shi
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Xin Fan
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Peng Dou
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Daqian Ma
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Xinhua Xu
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
- Tianjin Key Laboratory of Composite and Functional Materials
| |
Collapse
|
21
|
Dou P, Jiang A, Fan X, Ma D, Xu X. A coral-inspired nanoscale design of Sn–Cu/PANi/GO hybrid anode materials for high performance lithium-ion batteries. RSC Adv 2015. [DOI: 10.1039/c4ra17041e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A facile and scalable synthesis approach is developed for fabrication of a three-dimensional (3D) polyaniline (PANi)/graphene oxide (GO) hybrid hydrogel evenly embed with hollow Sn–Cu nanoparticles (Sn–Cu NPs) as high performance anodes.
Collapse
Affiliation(s)
- Peng Dou
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Anni Jiang
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Xin Fan
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Daqian Ma
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Xinhua Xu
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
- Tianjin Key Laboratory of Composite and Functional Materials
| |
Collapse
|
22
|
Meng H, Yang H, Yu X, Dou P, Ma D, Xu X. Synthesis of Sn–Co@PMMA nanowire arrays by electrodeposition and in situ polymerization as a high performance lithium-ion battery anode. RSC Adv 2015. [DOI: 10.1039/c5ra15671h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Transition metals have attracted much attention due to their high energy density in lithium-ion batteries (LIBs).
Collapse
Affiliation(s)
- Haowen Meng
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Hongyan Yang
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Xiaohui Yu
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Peng Dou
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Daqian Ma
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
| | - Xinhua Xu
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072
- P. R. China
- Tianjin Key Laboratory of Composite and Functional Materials
| |
Collapse
|
23
|
Fan X, Dou P, Jiang A, Ma D, Xu X. One-step electrochemical growth of a three-dimensional Sn-Ni@PEO nanotube array as a high performance lithium-ion battery anode. ACS Appl Mater Interfaces 2014; 6:22282-22288. [PMID: 25423255 DOI: 10.1021/am506237y] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Various well-designed nanostructures have been proposed to optimize the electrode systems of lithium-ion batteries for problems like Li(+) diffusion, electron transport, and large volume changes so as to fulfill effective capacity utilization and increase electrode stability. Here, a novel three-dimensional (3D) hybrid Sn-Ni@PEO nanotube array is synthesized as a high performance anode for a lithium-ion battery through a simple one-step electrodeposition for the first time. Superior to the traditional stepwise synthesis processes of heterostructured nanomaterials, this one-step method is more suitable for practical applications. The electrode morphology is well preserved after repeated Li(+) insertion and extraction, indicating that the positive synergistic effect of the alloy nanotube array and 3D ultrathin PEO coating could authentically optimize the current volume-expansion electrode system. The electrochemistry results further confirm that the superiority of the Sn-Ni@PEO nanotube array electrode could largely boost durable high reversible capacities and superior rate performances compared to a Sn-Ni nanowire array. This proposed ternary hybrid structure is proven to be an ideal candidate for the development of high performance anodes for lithium-ion batteries.
Collapse
Affiliation(s)
- Xin Fan
- School of Materials Science and Engineering, Tianjin University , Tianjin 300072, P.R. China
| | | | | | | | | |
Collapse
|
24
|
|
25
|
Wang J, Yang M, Dou P, Wang X, Zhang H. Influences of Annealing on the Perfluorosulfonate Ion-Exchanged Membranes Prepared by Melt Extrusion. Ind Eng Chem Res 2014. [DOI: 10.1021/ie502037p] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jing Wang
- Shandong Dongyue Polymer
Materials Company
Ltd., Zibo, Shandong 256400, China
| | - Miaokun Yang
- Shandong Dongyue Polymer
Materials Company
Ltd., Zibo, Shandong 256400, China
| | - Peng Dou
- Shandong Dongyue Polymer
Materials Company
Ltd., Zibo, Shandong 256400, China
| | - Xuejun Wang
- Shandong Dongyue Polymer
Materials Company
Ltd., Zibo, Shandong 256400, China
| | - Heng Zhang
- Shandong Dongyue Polymer
Materials Company
Ltd., Zibo, Shandong 256400, China
| |
Collapse
|
26
|
Wang J, Wang X, Dou P, Zhang H, Zhang Y. Morphology and properties of perfluorosulfonic acid polymer/perfluorocarboxylic acid polymer blend membranes. POLYM ENG SCI 2014. [DOI: 10.1002/pen.23879] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jing Wang
- School of Chemistry and Chemical Technology; Shanghai Jiaotong University; Shanghai 200240 People's Republic of China
| | - Xuejun Wang
- Shandong DongYue Polymer Material Co. Ltd; Tangshan Town; Zibo 256400 People's Republic of China
| | - Peng Dou
- Shandong DongYue Polymer Material Co. Ltd; Tangshan Town; Zibo 256400 People's Republic of China
| | - Heng Zhang
- Shandong DongYue Polymer Material Co. Ltd; Tangshan Town; Zibo 256400 People's Republic of China
| | - Yongming Zhang
- School of Chemistry and Chemical Technology; Shanghai Jiaotong University; Shanghai 200240 People's Republic of China
| |
Collapse
|
27
|
Fan X, Jiang A, Dou P, Ma D, Xu X. Three-dimensional ultrathin Sn/polypyrrole nanosheet network as high performance lithium-ion battery anode. RSC Adv 2014. [DOI: 10.1039/c4ra09114k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A schematic depiction of the detailed structure of 3D Sn/PPy nanosheet network as a lithium ion battery anode material.
Collapse
Affiliation(s)
- Xin Fan
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072, P. R. China
| | - Anni Jiang
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072, P. R. China
| | - Peng Dou
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072, P. R. China
| | - Daqian Ma
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072, P. R. China
| | - Xinhua Xu
- School of Materials Science and Engineering
- Tianjin University
- Tianjin 300072, P. R. China
- Tianjin Key Laboratory of Composite and Functional Materials
- Tianjin 300072, P. R. China
| |
Collapse
|
28
|
Wang H, Dou P, Lü C, Liu Z. Immuno-magnetic beads-based extraction-capillary zone electrophoresis-deep UV laser-induced fluorescence analysis of erythropoietin. J Chromatogr A 2012; 1246:48-54. [DOI: 10.1016/j.chroma.2012.02.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Revised: 02/03/2012] [Accepted: 02/06/2012] [Indexed: 01/08/2023]
|
29
|
He J, Liu Z, Ren L, Liu Y, Dou P, Qian K, Chen HY. On-line coupling of in-tube boronate affinity solid phase microextraction with high performance liquid chromatography–electrospray ionization tandem mass spectrometry for the determination of cis-diol biomolecules. Talanta 2010; 82:270-6. [DOI: 10.1016/j.talanta.2010.04.033] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2010] [Revised: 04/15/2010] [Accepted: 04/16/2010] [Indexed: 10/19/2022]
|
30
|
Ren L, Liu Z, Liu Y, Dou P, Chen HY. Ring-opening polymerization with synergistic co-monomers: access to a boronate-functionalized polymeric monolith for the specific capture of cis-diol-containing biomolecules under neutral conditions. Angew Chem Int Ed Engl 2009; 48:6704-7. [PMID: 19644989 DOI: 10.1002/anie.200902469] [Citation(s) in RCA: 181] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lianbing Ren
- Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 22 Hankou Road, Nanjing 210093, China
| | | | | | | | | |
Collapse
|
31
|
Ren L, Liu Z, Liu Y, Dou P, Chen HY. Ring-Opening Polymerization with Synergistic Co-monomers: Access to a Boronate-Functionalized Polymeric Monolith for the Specific Capture ofcis-Diol-Containing Biomolecules under Neutral Conditions. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200902469] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
32
|
Liang L, Dou P, Dong M, Ke X, Bian N, Liu Z. Study on a hidden protein-DNA binding in salmon sperm DNA sample by dynamic kinetic capillary isoelectric focusing. Anal Chim Acta 2009; 650:106-10. [PMID: 19720180 DOI: 10.1016/j.aca.2009.01.026] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2008] [Revised: 12/16/2008] [Accepted: 01/13/2009] [Indexed: 10/21/2022]
Abstract
Nuclease P1 is an important enzyme that hydrolyzes RNA or single-stranded DNA into nucleotides, and complete digestion is an essential basis for assays based on this enzyme. To digest a doubled-stranded DNA, the enzyme is usually combined with heat denaturing, which breaks doubled-stranded DNA into single strands. This paper presents an un-expected phenomenon that nuclease P1, in combination with heat denaturing, fails to completely digest a DNA sample extracted from salmon sperm. Under the experimental conditions used, at which nuclease P1 can completely digest calf thymus DNA, the digestion yield of salmon sperm DNA was only 89.5%. Spectrometric measurement indicated that a total protein of 4.7% is present in the DNA sample. To explain the reason for this phenomenon, the dynamic kinetic capillary isoelectric focusing (DK-CIEF) approach proposed previously, which allows for the discrimination of different types of protein-DNA interactions and the measurement of the individual dissociation rate constants, was modified and applied to examine possible protein-DNA interactions involved. It was found that a non-specific DNA-protein binding occurs in the sample, the dissociation rate constant for which was measured to be 7.05+/-0.83x10(-3) s(-1). The formation of DNA-protein complex was suggested to be the main reason for the incomplete digestion of the DNA sample. The modified DK-CIEF approach can be applied as general DNA samples, with the advantages of fast speed and low sample consumption.
Collapse
Affiliation(s)
- Liang Liang
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | | | | | | | | | | |
Collapse
|
33
|
Wang J, Lu Y, Yuan H, Dou P. Crystallization, orientation morphology, and mechanical properties of biaxially oriented starch/polyvinyl alcohol films. J Appl Polym Sci 2008. [DOI: 10.1002/app.28646] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
34
|
He J, Liu Z, Liu J, Dou P, Chen HY. [Advances and strategies in gene doping detection]. Se Pu 2008; 26:402-407. [PMID: 18959232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
Abstract
This review surveys the recent status of gene doping detection and the strategies for anti-gene doping. The main gene doping candidates for athletes are summarized, and the advances in the detection of the proteins expressed by these genes such as erythropoietin (EPO) and human growth hormone (hGH) are reviewed. The potential detection strategies for further gene doping analysis are also discussed.
Collapse
Affiliation(s)
- Jiangang He
- Key Lab of Analytical Chemistry for Life Science, Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China
| | | | | | | | | |
Collapse
|
35
|
Dou P, Liu Z, He J, Xu JJ, Chen HY. Rapid and high-resolution glycoform profiling of recombinant human erythropoietin by capillary isoelectric focusing with whole column imaging detection. J Chromatogr A 2008; 1190:372-6. [DOI: 10.1016/j.chroma.2008.03.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Revised: 02/24/2008] [Accepted: 03/03/2008] [Indexed: 01/01/2023]
|
36
|
Dou P, Jia X, Suo S, Wang R, Zhang M. Pressure distribution at the stump/socket interface in transtibial amputees during walking on stairs, slope and non-flat road. Clin Biomech (Bristol, Avon) 2006; 21:1067-73. [PMID: 16919376 DOI: 10.1016/j.clinbiomech.2006.06.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2006] [Revised: 06/13/2006] [Accepted: 06/20/2006] [Indexed: 02/07/2023]
Abstract
BACKGROUND Studies examining the stump/socket interface stresses have been restricted to unsupported stance and natural gait, i.e. walking at a comfortable speed on flat and straight walkway. However, the pressure behaviour as to the interface in unilateral transtibial amputees during walking on stairs, slope and non-flat road is unclear. METHODS Pressure distribution changes at multiple points, expressed as mean peak stump/socket interface pressure, mean pressure level over 90% of peak pressure, time in which pressure exceeded 90% of peak pressure and time-pressure integral at the period of sustained sub-maximal load, were measured during natural ambulating and walking on stairs, slope and non-flat road. FINDINGS Compared with natural gait, the mean peak pressure and sustained sub-maximal load increase notably over the patellar tendon during walking on stairs and non-flat road, and however decrease or change insignificantly at the patellar tendon on slope and over other measured areas in all conditions; moreover the time period of sustained sub-maximal load changes remarkably, except over the patellar tendon during walking up slope and over the popliteal area on non-flat road; finally, the time-pressure integral in the time period of sustained sub-maximal load changes considerably, except at the patellar tendon during walking up slope. INTERPRETATION The pressure characteristics during natural ambulating seem not to be highly predictive of what occurs in the conditions of walking on stairs, slope and non-flat road, which leads to significant increase in amplitude domain of tissue loading only at the patellar tendon, and however to remarkable changes in temporal sequences of tissue (un-)loading almost in all measured regions.
Collapse
Affiliation(s)
- Peng Dou
- Division of Intelligent and Biomechanical System, State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China.
| | | | | | | | | |
Collapse
|
37
|
Hellier JL, Patrylo PR, Dou P, Nett M, Rose GM, Dudek FE. Assessment of inhibition and epileptiform activity in the septal dentate gyrus of freely behaving rats during the first week after kainate treatment. J Neurosci 1999; 19:10053-64. [PMID: 10559413 PMCID: PMC6782973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023] Open
Abstract
Mossy fiber reorganization has been hypothesized to restore inhibition months after kainate-induced status epilepticus. The time course of recovery of inhibition after kainate treatment, however, is not well established. We tested the hypothesis that if inhibition is decreased after kainate treatment, it is restored within the first week when little or no mossy fiber reorganization has occurred. Chronic in vivo recordings of the septal dentate gyrus were performed in rats before and 1, 4, and 7-8 d after kainate (multiple injections of 5 mg/kg, i.p.; n = 17) or saline (n = 11) treatment. Single and paired-pulse stimuli were used to assess synaptic inhibition. The first day after kainate treatment, only a fraction of rats showed multiple population spikes (35%), prolonged field postsynaptic potentials (76%), and loss of paired-pulse inhibition (29%) to perforant path stimulation. Thus, inhibition was reduced in only some of the kainate-treated rats. By 7-8 d after treatment, nearly all kainate-treated rats showed partial or full recovery in these response characteristics. Histological analysis indicated that kainate-treated rats had a significant decrease in the number of hilar neurons compared to controls, but Timm staining showed little to no mossy fiber reorganization. These results suggest that a decrease in synaptic inhibition in the septal dentate gyrus is not a prerequisite for epileptogenesis and that most of the recovery of inhibition occurs before robust Timm staining in the inner molecular layer.
Collapse
Affiliation(s)
- J L Hellier
- Department of Anatomy and Neurobiology, Colorado State University, Fort Collins, Colorado 80523, USA
| | | | | | | | | | | |
Collapse
|
38
|
Smith BN, Dou P, Barber WD, Dudek FE. Vagally evoked synaptic currents in the immature rat nucleus tractus solitarii in an intact in vitro preparation. J Physiol 1998; 512 ( Pt 1):149-62. [PMID: 9729625 PMCID: PMC2231195 DOI: 10.1111/j.1469-7793.1998.149bf.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
1. Whole-cell voltage-clamp recordings in an in vitro brainstem-cranial nerve explant preparation were used to assess the local circuitry activated by vagal input to nucleus tractus solitarii (NTS) neurones in immature rats. 2. All neurones that responded to vagal stimulation displayed EPSCs of relatively constant latency. Approximately 50 % of these also demonstrated variable-latency IPSCs, and approximately 31 % also displayed variable-latency EPSCs to vagal stimulation. All neurones also had spontaneous EPSCs and IPSCs. 3. Evoked and spontaneous EPSCs reversed near 0 mV and were blocked by the glutamate AMPA/kainate receptor antagonists 6,7-nitroquinoxaline-2,3-dione (DNQX) or 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) at rest. Evoked EPSCs had rapid rise times (< 1 s) and decayed monoexponentially (tau = 2. 04 +/- 0.03 ms) at potentials near rest. 4. At holding potentials positive to approximately -50 mV, a slow EPSC could be evoked in the presence of DNQX or CNQX. This current peaked at holding potentials near -25 mV and was blocked by the NMDA receptor antagonist DL-2-amino-5-phosphonovaleric acid (AP5). It was therefore probably due to activation of NMDA receptors by vagal afferent fibres. 5. Fast IPSCs reversed near -70 mV and were blocked by the GABAA receptor antagonist bicuculline. In addition, bicuculline enhanced excitatory responses to vagal stimulation and increased spontaneous EPSC frequency. Antagonists to AMPA/kainate receptors reversibly blocked stimulus-associated IPSCs and also decreased the frequency of spontaneous IPSCs. 6. These findings suggest that glutamate mediates synaptic transmission from the vagus nerve to neurones in the immature NTS by acting at non-NMDA and NMDA receptors. NTS neurones may also receive glutamatergic and GABAergic synaptic input from local neurones that can be activated by vagal input and/or regulated by amino acid inputs from other brainstem neurones.1. Whole-cell voltage-clamp recordings in an in vitro brainstem-cranial nerve explant preparation were used to assess the local circuitry activated by vagal input to nucleus tractus solitarii (NTS) neurones in immature rats.
Collapse
Affiliation(s)
- B N Smith
- Department of Anatomy and Neurobiology, Colorado State University, Fort Collins, CO 80523, USA.
| | | | | | | |
Collapse
|
39
|
Kuhn TB, Williams CV, Dou P, Kater SB. Laminin directs growth cone navigation via two temporally and functionally distinct calcium signals. J Neurosci 1998; 18:184-94. [PMID: 9412499 PMCID: PMC6793400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
During development, growth cones navigate to their targets via numerous interactions with molecular guidance cues, yet the mechanisms of how growth cones translate guidance information into navigational decisions are poorly understood. We have examined the role of intracellular Ca2+ in laminin (LN)-mediated growth cone navigation in vitro, using chick dorsal root ganglion neurons. Subsequent to contacting LN-coated beads with filopodia, growth cones displayed a series of stereotypic changes in behavior, including turning toward LN-coated beads and a phase of increased rates of outgrowth after a pause at LN-coated beads. A pharmacological approach indicated that LN-mediated growth cone turning required an influx of extracellular Ca2+, likely in filopodia with LN contact, and activation of calmodulin (CaM). Surprisingly, fluorescent Ca2+ imaging revealed no LN-induced rise in intracellular Ca2+ in filopodia attached to their parent growth cone. However, isolation of filopodia by laser-assisted transection unmasked a rapid, LN-specific rise in intracellular Ca2+ (+73 +/- 11 nM). Additionally, a second, sustained rise in intracellular Ca2+ (+62 +/- 8 nM) occurred in growth cones, with a distinct delay 28 +/- 3 min after growth cone filopodia contacted LN-coated beads. This delayed, sustained Ca2+ signal paralleled the phase of increased rates of outgrowth, and both events were sensitive to the inhibition of Ca2+/CaM-dependent protein kinase II (CaM-kinase II) with 2 microM KN-62. We propose that LN-mediated growth cone guidance can be attributed, in part, to two temporally and functionally distinct Ca2+ signals linked by a signaling cascade composed of CaM and CaM-kinase II.
Collapse
Affiliation(s)
- T B Kuhn
- Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado 80523, USA
| | | | | | | |
Collapse
|
40
|
Abstract
Previous findings indicate that spatial restriction of intracellular calcium levels within growth cones can regulate growth cone behavior at many levels, ranging from filopodial disposition to neurite extension. By combining techniques for focal stimulation of growth cones with those for measurement of filopodia and for capturing low intensity calcium signals, we demonstrate that filopodia on individual growth cones can respond to imposed stimuli independently from one another. Moreover, filopodia and their parent growth cones appear to represent functionally and morphologically distinct domains of calcium regulation, possessing distinct calcium sources and sinks. Both are sensitive to calcium influx; however, application of the calcium ionophore A23187 to cells in calcium-free medium demonstrated the presence of potential intracellular calcium pools in the growth cone proper, but not in isolated filopodia. Thapsigargin significantly reduced the rise in growth cone calcium levels associated with excitatory neurotransmitters, further implicating release from calcium pools as one component of growth cone calcium regulation. The relative contributions of these pools were examined in response to excitatory neurotransmitters by quantitative calcium measurements made in both growth cones and isolated filopodia. Striking differences were observed; filopodia were sensitive to a low concentration of dopamine and serotonin, while growth cones displayed an amplified rise at a higher concentration. The spatial distribution of organelles that could serve as morphological correlates to such calcium amplification was examined using confocal microscopy. While the majority of organelles were located in the central core of the growth cone proper, peripheral organelles were detected at the base of a subset of filopodia. The distinctive distribution of calcium regulation within motile growth cones suggests one mechanism by which growth cones may regulate their complex behavior.
Collapse
Affiliation(s)
- R W Davenport
- Program in Neuronal Growth and Development, Colorado State University, Fort Collins 80523, USA.
| | | | | | | |
Collapse
|
41
|
Abstract
Although it is becoming increasingly clear that structural dynamics on neurite shafts play important roles in establishing neuronal architecture, the underlying mechanisms are unknown. The present study investigates local induction of filopodia along the shafts of neurites, a process that, by analogy to the growth cone, can represent the first stage in the generation of a new neuronal process. We show that filopodia can be induced reliably along the neurite shaft in response to a localized electric field stimulus that evokes large local intracellular calcium increases. Neither induction of filopodia nor a local rise in intracellular calcium occurred in calcium-free medium. Although calcium induction of neurite filopodia is highly reliable, forming in response to more than 90% of attempts, it is developmental state-dependent, since neurite filopodia could not be induced in neurons previously defined as "stable state." We have found two distinct changes in stable state neurons that can decrease the ability to induce new neurites. The first is a reduced calcium response: Field stimulation produced large local rises (280 nM) in intracellular calcium in growing neurons, whereas the identical stimulus produced smaller changes (148 nM) in stable state neurons. Second, stable state neurons change so that even when the stimulus intensity was increased to elicit a calcium response that would have been sufficient to induce filopodia in growing neurites, neurite filopodia were still not induced. Thus, intracellular calcium plays a key role in structural changes along the shafts of neurites. Furthermore, developmental changes in both calcium homeostatic components and in calcium responsiveness (i.e., the sensitivity of cellular components that modulate neurite morphology) underlie shifts from plasticity to stability of neuronal architecture in this system.
Collapse
Affiliation(s)
- C V Williams
- Department of Anatomy and Neurobiology, Colorado State University, Fort Collins 80523, USA
| | | | | | | |
Collapse
|
42
|
Abstract
The dynamic nature of neuronal growth cone filopodia led to the suggestion that the primary function of filopodia is to sample their immediate environment, responding to and transducing environmental signals that affect growth cone behaviour and shape. Filopodia seem well suited to serve as antenna-like sensors, their broad span allows sampling of information over a greatly enhanced radius, and forward-projecting filopodia encounter potential cues in the molecular terrain long before the advancing growth cone itself. Filopodia in culture can serve structural roles, exert mechanical tension and selectively adhere to their surrounding. Whether or not filopodia have a general sensory role has not been tested directly, largely because of their small size, which limits an electrophysiological approach, and their integral relationship with the parent growth cone, which prevents resolution of their different functions. Here we use surgical procedures to isolate individual filopodia from their parent growth cone and, by monitoring their morphology and calcium second messenger systems, we show that neuronal growth cone filopodia contain signal transduction mechanisms that allow autonomous responses and the transmission of distant environmental information to their parent growth cone.
Collapse
Affiliation(s)
- R W Davenport
- Department of Anatomy and Neurobiology, Colorado State University, Fort Collins 80523
| | | | | | | |
Collapse
|
43
|
Davis L, Dou P, DeWit M, Kater SB. Protein synthesis within neuronal growth cones. J Neurosci 1992; 12:4867-77. [PMID: 1464771 PMCID: PMC6575760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
This study investigates the capacity of neuronal growth cones to synthesize protein locally and independently of their cell body. Isolated growth cones were prepared from cultures of neurons from the snail Helisoma by transecting neurites proximal to the growth cone. The capacity for protein synthesis was tested by radiolabeling cultures with 3H-leucine and analyzing the resultant autoradiograms. Isolated growth cones displayed incorporation of 3H-leucine that was inhibited by treatment with the protein synthesis inhibitors anisomycin and pactamycin, indicating that ribosomal-dependent translation occurs in growth cones. Ultrastructural analyses of growth cones demonstrated the presence of polyribosomes, the machinery for protein synthesis. The density of polyribosomes varied between growth cones, even between different growth cones on the same neuron, suggesting that growth cones express a range of protein synthetic capabilities. That different types of growth cones possess differing capabilities for protein synthesis is suggested in autoradiograms of 3H-leucine incorporation by the growth cones of axonal and nonaxonal neurites; incorporation was radically reduced in axonal growth cones in comparison with non-axonal growth cones. Finally, growth cones that were isolated for 2 d prior to radiolabeling incorporate 3H-leucine in a eukaryotic ribosomal-dependent manner, suggesting that the capacity for translation is long-lived in growth cones. Taken together, these studies reveal a capacity for protein synthesis confined totally to the neuronal growth cone proper. The synthesis of proteins in growth cones could afford a mechanism for the alteration of growth cone structure or function. This is in accord with the view that growth cones participate autonomously, to at least some extent, in the processes of synaptogenesis and the construction of neuronal architecture.
Collapse
Affiliation(s)
- L Davis
- Program in Neuronal Growth and Development, Colorado State University, Fort Collins 80523
| | | | | | | |
Collapse
|
44
|
Rehder V, Jensen JR, Dou P, Kater SB. A comparison of calcium homeostasis in isolated and attached growth cones of the snail Helisoma. J Neurobiol 1991; 22:499-511. [PMID: 1890426 DOI: 10.1002/neu.480220506] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This study examines the capability of growth cones from identified neurons of the snail Helisoma trivolvis to perform calcium homeostasis. Calcium influx into the cytoplasm was eliminated or increased experimentally to alter [Ca]i, and the compensatory response of the growth cone was measured with the fluorescent calcium indicator Fura-2. Growth cones compensated for both increases and decreases in calcium influx by restoring [Ca]i towards basal levels under both types of challenges. The intrinsic ability of growth cones to control [Ca]i was examined in physically isolated growth cones. Isolated growth cones demonstrated essentially identical calcium homeostatic properties to their intact counterparts, indicating that mechanisms governing calcium homeostasis exist intrinsically in the growth cone. Such independence may add significantly to the growth cone's potential to locally interpret and respond to stimuli encountered en route to its appropriate target.
Collapse
Affiliation(s)
- V Rehder
- Department of Anatomy and Neurobiology, Colorado State University, Ft. Collins 80523
| | | | | | | |
Collapse
|
45
|
Chen LX, Zhu YR, Dou P. Phagaquosonogram (PASG) diagnosis for cancer of gastric cardia. A preliminary study of 223 patients. Chin Med J (Engl) 1989; 102:844-50. [PMID: 2517725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Phagaquosonographies (PASG) of 100 normal subjects and 223 patients with cardiac cancer (CC) were analyzed. The apparatus was self-designed and self-manufactured. The wave patterns and the pre-ejection period and other 8 quantitative indices in PASG were compared and patients with CC were found to have abnormal levels (P less than 0.01). The phagaquosonograms in 82 patients with esophageal, gastric or cardias (non-cancer) diseases served as controls. The PASG showed positive results in 97.3%, suspicious in 2.3% and negative in 0.4% of CC cases and 100% negative in the normal subjects. It was 1.2% positive, 8.5% suspicious and 90.3% negative in the esophageal, cardiac or gastric non-cancer diseases. PASG has high sensitivity (97.3%), and typical characteristics (98.8%). It is shown that this method can be used in screening, diagnosis, differential diagnosis and prediction of prognosis of cardiac cancer.
Collapse
|
46
|
Mattson MP, Dou P, Kater SB. Outgrowth-regulating actions of glutamate in isolated hippocampal pyramidal neurons. J Neurosci 1988; 8:2087-100. [PMID: 2898515 PMCID: PMC6569320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The present study examined the effects of glutamate on the outgrowth of dendrites and axons in isolated hippocampal pyramidal-like neurons in cell culture. During the first day of culture the survival and outgrowth of these neurons was unaffected by high concentrations (up to 1 nM) of glutamate, quisqualic acid (QA), kainic acid (KA), and N-methyl-D-aspartic acid. Beginning on day 2 of culture high levels of glutamate, KA and QA were toxic to the majority of pyramidal neurons, while subtoxic levels of these agents caused a well-defined, dose-dependent, sequence of effects on dendritic outgrowth. At increasing concentrations of glutamate, QA, and KA, the following events were observed: (1) dendritic outgrowth rates were reduced, while axonal elongation rates were unaffected; (2) dendritic length was reduced, while axons continued to grow; (3) dendrites regressed dramatically, and axonal outgrowth rate was reduced. These dendrite-specific effects of glutamate were apparently mediated at the growth cones since focal application of glutamate to individual dendritic growth cones resulted in suppression of growth cone activity and a regression of the dendrite; axons were unaffected by focal glutamate application. Pharmacological tests using glutamate receptor agonists and antagonists demonstrated that receptors of the KA/QA type mediated the glutamate effects on outgrowth and survival. The calcium channel blocker Co2+ prevented both glutamate neurotoxicity and glutamate-induced dendritic regression. Ionophore A23187 and elevations in extracellular K+ levels each caused a dose-dependent series of outgrowth and survival responses similar to those caused by glutamate. Taken together, these results indicate that activation of glutamate receptors leads to the opening of voltage-dependent calcium channels; the resulting increases in calcium influx lead to the observed alterations in dendritic outgrowth and neuronal survival.
Collapse
Affiliation(s)
- M P Mattson
- Department of Anatomy and Neurobiology, Colorado State University, Fort Collins 80523
| | | | | |
Collapse
|