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Zhang T, Liang W, Ou W, Zhang M, Cui S, Zhang S. Daphnetin alleviates neuropathic pain in chronic constrictive injury rats via regulating the NF-κB dependent CXCL1/CXCR2 signaling pathway. Pharm Biol 2023; 61:746-754. [PMID: 37177984 PMCID: PMC10184651 DOI: 10.1080/13880209.2023.2198560] [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] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
CONTEXT Daphnetin is a natural product with anti-inflammatory, antioxidant, and neuroprotective properties. Reports have found that it has a strong analgesic effect; however, its analgesic mechanism is unknown. OBJECTIVE We explored the effect and mechanism of daphnetin on neuropathic pain (NP). MATERIALS AND METHODS The rat model of NP was established by ligation of the sciatic nerve. Male Sprague-Dawley rats were divided into six groups: Control, Model, Sham, morphine (0.375 mg/kg), and daphnetin (0.0625 and 0.025 mg/kg). Rats were intrathecally injected with drugs or normal saline once daily for three days. Hyperalgesia was evaluated by mechanical withdrawal threshold (MWT) and thermal withdrawal threshold (TWT). Protein levels were detected using ELISA, immunofluorescence, and western blotting. RESULTS Compared to the Model group, daphnetin improved TWT (46.70 °C vs. 42.20 °C) and MWT (45.60 g vs. 23.60 g), reduced the expression of interleukin-1β (0.99 ng/g vs. 1.42 ng/g), interleukin-6 (0.90 ng/g vs. 1.52 ng/g), and tumor necrosis factor-α (0.93 ng/g vs. 1.52 ng/g) in the sciatic nerve. Daphnetin decreased the expression of toll-like receptor 4 (TLR4) (0.47-fold), phosphorylated inhibitor of NF-κB (p-IKBα) (0.29-fold), nuclear factor kappaB (NF-κB) (0.48-fold), glial fibrillary acidic protein (GFAP) (0.42-fold), CXC chemokine ligand type 1 (CXCL1) (0.84-fold), CXC chemokine receptor type 2 (CXCR2) (0.78-fold) in the spinal cord. DISCUSSION AND CONCLUSIONS Daphnetin alleviates NP by inhibiting inflammation and astrocyte activation in the spinal cord, providing theoretical support for the extensive clinical treatment of NP.
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Affiliation(s)
- Tianrui Zhang
- Department of Pharmacology of Traditional Chinese Medicine, College of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Wulin Liang
- Department of Pharmacology of Traditional Chinese Medicine, College of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Wenjing Ou
- Department of Pharmacology of Traditional Chinese Medicine, College of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Mingqian Zhang
- Department of Pharmacology of Traditional Chinese Medicine, College of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Shuang Cui
- Department of Pharmacology of Traditional Chinese Medicine, College of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Shuofeng Zhang
- Department of Pharmacology of Traditional Chinese Medicine, College of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
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Chen J, Zhao M, Zhou R, Ou W, Yao P. How heavy is the medical expense burden among the older adults and what are the contributing factors? A literature review and problem-based analysis. Front Public Health 2023; 11:1165381. [PMID: 37397714 PMCID: PMC10313336 DOI: 10.3389/fpubh.2023.1165381] [Citation(s) in RCA: 1] [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: 02/14/2023] [Accepted: 05/12/2023] [Indexed: 07/04/2023] Open
Abstract
In recent years, the aging population and increasing medical expenses among the older adults have emerged as significant public health concerns. National governments must conduct medical expense accounting and implement measures to reduce the burden of medical costs on the older population. However, limited studies have focused on total medical expenditure from a macro perspective, with many researches exploring individual medical expenses from different perspectives. This review introduces the trend of population aging and its impact on health cost change, reviews research on the medical expense burden of the older population and contributing factors, and points out underlying problems and limitations of current studies. Based on the present studies, the review emphasizes the necessity of medical expense accounting and analyzes the medical expense burden of the older population. Future studies should explore the impacts of medical insurance funds and health service system reforms on reducing medical expenses and developing a supporting medical insurance reform plan.
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Affiliation(s)
- Jie Chen
- Department of Anesthesiology, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning, China
| | - Meizhen Zhao
- Nursing Department, Tongji Hospital of Tongji Medical College of Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Renyi Zhou
- Department of Orthopaedics, The First Affiliated Hospital of China Medical University, Shenyang, Liaoning, China
| | - Wenjing Ou
- College of Health Management, China Medical University, Shenyang, Liaoning, China
| | - Pin Yao
- Department of Health Management, Department of Health Policy and Hospital Management, Shengjing Hospital of China Medical University, Shenyang, Liaoning, China
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Wu C, Ou W, Gao M, Li J, Liu Q, Kang Z, Wang H, Li Z, Wang X, Zhang S, Zhang Y, Jin F, Zhang K, Li X. Correction to: Digital measurement and correlation analysis of coronal and sagittal anatomic parameters in the radiographs of adolescent patients with idiopathic scoliosis. Eur Spine J 2023:10.1007/s00586-023-07645-0. [PMID: 37029283 DOI: 10.1007/s00586-023-07645-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Subscribe] [Scholar Register] [Indexed: 04/09/2023]
Affiliation(s)
- Chao Wu
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
- Baotou Central Hospital, Baotou, 014040, Inner Mongolia, China
| | - Wenjing Ou
- Baotou Central Hospital, Baotou, 014040, Inner Mongolia, China
| | - Mingjie Gao
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Jiawei Li
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Qinghua Liu
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Zhijie Kang
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Haiyan Wang
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Zhijun Li
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Xing Wang
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Shaojie Zhang
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Yunfeng Zhang
- Department of Radiology, The Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, Inner Mongolia, China
| | - Feng Jin
- Department of Radiology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, Inner Mongolia, China
| | - Kai Zhang
- Department of Orthopedics, Ulanqab Second Hospital, Ulanqab, 011800, Inner Mongolia, China
| | - Xiaohe Li
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China.
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Ou W, Zhang Q, He J, Shao X, Yang Y, Wang X. Hospitalization costs of injury in elderly population in China: a quantile regression analysis. BMC Geriatr 2023; 23:143. [PMID: 36918769 PMCID: PMC10013238 DOI: 10.1186/s12877-023-03729-0] [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: 08/19/2022] [Accepted: 01/04/2023] [Indexed: 03/16/2023] Open
Abstract
BACKGROUND Trauma in the elderly is gradually growing more prevalent as the aging population increases over time. The purpose of this study is to assess hospitalization costs of the elderly trauma population and analyze the association between those costs and the features of the elderly trauma population. METHODS In a retrospective analysis, data on trauma patients over 65 who were admitted to the hospital for the first time due to trauma between January 2017 and March 2022 was collected from a tertiary comprehensive hospital in Baotou. We calculated and analyzed the hospitalization cost components. According to various therapeutic approaches, trauma patients were divided into two subgroups: non-surgical patients (1320 cases) and surgical patients (387 cases). Quantile regression was used to evaluate the relationship between trauma patients and hospitalization costs. RESULTS This study comprised 1707 trauma patients in total. Mean total hospitalization costs per patient were ¥20,741. Patients with transportation accidents incurred the highest expenditures among those with external causes of trauma, with a mean hospitalization cost of ¥24,918, followed by patients with falls at ¥19,809 on average. Hospitalization costs were dominated by medicine costs (¥7,182 per capita). According to the quantile regression results, all trauma patients' hospitalization costs were considerably increased by length of stay, surgery, the injury severity score (16-24), multimorbidity, thorax injury, and blood transfusion. For non-surgical patients, length of stay, multimorbidity, and the injury severity score (16-24) were all substantially linked to higher hospitalization costs. For surgical patients, length of stay, injury severity score (16-24), and hip and thigh injuries were significantly associated with greater hospitalization costs. CONCLUSIONS Using quantile regression to identify factors associated with hospitalization costs could be helpful for addressing the burden of injury in the elderly population. Policymakers may find these findings to be insightful in lowering hospitalization costs related to injury in the elderly population.
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Affiliation(s)
- Wenjing Ou
- College of Health Management, China Medical University, Shenyang, 110122, Liaoning, China
- Baotou Central Hospital, Baotou, 014040, Inner Mongolia, China
| | - Qin Zhang
- Shengjing Hospital of China Medical University, Shenyang, 110001, China
| | - Junlin He
- College of Health Management, China Medical University, Shenyang, 110122, Liaoning, China
| | - Xinye Shao
- College of Health Management, China Medical University, Shenyang, 110122, Liaoning, China
| | - Yang Yang
- College of Health Management, China Medical University, Shenyang, 110122, Liaoning, China
| | - Xin Wang
- College of Health Management, China Medical University, Shenyang, 110122, Liaoning, China.
- Research Center for Health Development-Liaoning New Type Think Tank for University, China Medical University, Shenyang, 110122, Liaoning, China.
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Wu C, Ou W, Gao M, Li J, Liu Q, Kang Z, Wang H, Li Z, Wang X, Zhang S, Zhang Y, Jin F, Zhang K, Li X. Digital measurement and correlation analysis of coronal and sagittal anatomic parameters in the radiographs of adolescent patients with idiopathic scoliosis. Eur Spine J 2023; 32:1161-1172. [PMID: 36745261 DOI: 10.1007/s00586-023-07527-5] [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: 09/27/2022] [Accepted: 01/06/2023] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To use digital software to measure the morphologic and anatomic parameters of adolescent idiopathic scoliosis (AIS). Differences and correlations among different parameters were compared to provide an anatomic basis for the selection of treatment methods and preoperative evaluation of AIS. METHODS Spinal radiographs were taken from 300 boys and girls (age, 10-18 years) suffering from idiopathic scoliosis in four grade-A hospitals in Inner Mongolia. After screening, 120 cases with complete imaging data were assessed. Imaging data were transferred to a work station (Dr Wise™). The anatomic indices of the Cobb Angle, CVA, AVT, TS, CA, CPT, CSI, FPT, CCA, TK, LL, SS, PT, and PI were measured. RESULTS There were significant differences in AVT between different grades and types of scoliosis (F = 34.079, P = 0.000; χ2 = 23.379, P = 0.000). AVT was a protective factor, and the smaller the AVT, the less severe was the scoliosis. Compared with adolescents with mild or moderate scoliosis, the Cobb angle of adolescents with severe scoliosis was negatively correlated with CCA, LL, and SS (r = - 0.641, p < 0.05; r = - 0.695, p < 0.01; r = - 0.814, p < 0.01). CONCLUSIONS Some of the anatomic parameters in the coronal and sagittal planes of adolescents with idiopathic scoliosis were significantly different according to the severity and type of scoliosis. Significant correlations were found between more anatomic indices in adolescents with severe scoliosis than in adolescents suffering from mild or moderate scoliosis.
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Affiliation(s)
- Chao Wu
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
- Baotou Central Hospital, Baotou, 014040, Inner Mongolia, China
| | - Wenjing Ou
- Baotou Central Hospital, Baotou, 014040, Inner Mongolia, China
| | - Mingjie Gao
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Jiawei Li
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Qinghua Liu
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Zhijie Kang
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Haiyan Wang
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Zhijun Li
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Xing Wang
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Shaojie Zhang
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China
| | - Yunfeng Zhang
- Department of Radiology, The Second Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, Inner Mongolia, China
| | - Feng Jin
- Department of Radiology, Affiliated Hospital of Inner Mongolia Medical University, Hohhot, 010010, Inner Mongolia, China
| | - Kai Zhang
- Department of Orthopedics, Ulanqab Second Hospital, Ulanqab, 011800, Inner Mongolia, China
| | - Xiaohe Li
- Department of Anatomy, School of Basic Medicine, Inner Mongolia Medical University, Hohhot, 010000, Inner Mongolia, China.
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Zhang T, Liang W, Zhang M, Cui S, Huang X, Ou W, Huang R, Gao J, Jia Z, Zhang S. Daphnetin Improves Neuropathic Pain by Inhibiting the Expression of Chemokines and Inflammatory Factors in the Spinal Cord and Interfering with Glial Cell Polarization. Pharmaceuticals (Basel) 2023; 16:243. [PMID: 37259390 PMCID: PMC9964401 DOI: 10.3390/ph16020243] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Revised: 01/18/2023] [Accepted: 01/25/2023] [Indexed: 08/13/2023] Open
Abstract
Neuropathic pain (NP) is a common pain disease that seriously affects the quality of life and physical and mental health of patients. Daphnetin is extracted from the Daphne giraldii Nitsche and has the structure of 7,8-dihydroxy coumarin. As a natural product, daphnetin displays a wide range of pharmacological activities, such as analgesia and anti-inflammatory activities, but whether it is able to improve NP through anti-inflammatory effects is unknown. Therefore, this paper intends to investigate the mechanism of daphnetin in improving NP rats affected by the intrathecal injection of tumor necrosis factor-α (TNF-α) from the perspective of anti-inflammation. Our results showed that daphnetin significantly improved hyperalgesia in NP rats. Daphnetin inhibited the activation and polarization of glial cells and neurons in the spinal cord of NP rats and reduced the expression of mRNA and protein of inflammatory factors and chemokine pairs in the spinal cord. Daphnetin inhibited the polarization of human microglia cell 3 (HMC3) cells and human glioma cells (U251) cells toward M1 microglia and A1 astrocytes, respectively, and induced the conversion of M1 microglia and A1 astrocytes to M2 microglia and A2 astrocytes, respectively. In conclusion, daphnetin ameliorates NP by inhibiting the expression of inflammatory factors and chemokines and the polarization of glial cells in the spinal cord of NP rats. This study provides a theoretical basis for the treatment of NP with daphnetin to expand the clinical application of daphnetin.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | - Shuofeng Zhang
- Department of Pharmacology of Traditional Chinese Medicine, College of Chinese Medicine, Beijing University of Chinese Medicine, Beijing 102488, China
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Zhang T, Zhang M, Cui S, Liang W, Jia Z, Guo F, Ou W, Wu Y, Zhang S. The core of maintaining neuropathic pain: Crosstalk between glial cells and neurons (neural cell crosstalk at spinal cord). Brain Behav 2023; 13:e2868. [PMID: 36602945 PMCID: PMC9927860 DOI: 10.1002/brb3.2868] [Citation(s) in RCA: 1] [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] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/29/2022] [Accepted: 12/06/2022] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Neuropathic pain (NP) caused by the injury or dysfunction of the nervous system is a chronic pain state accompanied by hyperalgesia, and the available clinical treatment is relatively scarce. Hyperalgesia mediated by pro-inflammatory factors and chemokines plays an important role in the occurrence and maintenance of NP. DATA TREATMENT Therefore, we conducted a systematic literature review of experimental NP (PubMed Medline), in order to find the mechanism of inducing central sensitization and explore the intervention methods of hyperalgesia caused by real or simulated injury. RESULT In this review, we sorted out the activation pathways of microglia, astrocytes and neurons, and the process of crosstalk among them. It was found that in NP, the microglia P2X4 receptor is the key target, which can activate the mitogen-activated protein kinase pathway inward and then activate astrocytes and outwardly activate neuronal tropomyosin receptor kinase B receptor to activate neurons. At the same time, activated neurons continue to maintain the activation of astrocytes and microglia through chemokines on CXCL13/CXCR5 and CX3CL1/CX3CR1. This crosstalk process is the key to maintaining NP. CONCLUSION We summarize the further research on crosstalk among neurons, microglia, and astrocytes in the central nervous system, elaborate the ways and connections of relevant crosstalk, and find potential crosstalk targets, which provides a reference for drug development and preclinical research.
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Affiliation(s)
- Tianrui Zhang
- Department of Pharmacology of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Mingqian Zhang
- Department of Pharmacology of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Shuang Cui
- Department of Pharmacology of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Wulin Liang
- Department of Pharmacology of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Zhanhong Jia
- Department of Pharmacology of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Fanfan Guo
- Department of Pharmacology of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Wenjing Ou
- Department of Pharmacology of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Yonghong Wu
- Department of Pharmacology of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
| | - Shuofeng Zhang
- Department of Pharmacology of Traditional Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
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Xia K, Wang F, Lai X, Luo P, Chen H, Ma Y, Huang W, Ou W, Li Y, Feng X, Lei Z, Tu X, Ke Q, Mao F, Deng C, Xiang A. Gene Editing/Gene Therapies: AAV-MEDIATED GENE THERAPY PRODUCES FERTILE OFFSPRING IN THE LHCGR-DEFICIENT MOUSE MODEL OF LEYDIG CELL FAILURE. Cytotherapy 2022. [DOI: 10.1016/s1465-3249(22)00156-6] [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: 11/26/2022]
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Wang S, Ou W, Li N, Wang S, Wu H, Pu Y, Xiao S, Fu Y, Wang T. P22.05 Dynamic Monitoring of Blood Samples by PEAC Technology for Early-Stage Lung Cancer Patients After Surgery. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.08.359] [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: 10/20/2022]
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Liu F, Ou W, Diede S, Whitman E. Real-world experience of pembrolizumab in patients with advanced melanoma: A large retrospective observational study. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy288.091] [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: 11/13/2022] Open
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Liu W, Liu Y, Yang Y, Ou W, Chen X, Huang B, Wang H, Liu M. Metabolic Biomarkers of Aging and Aging-related Diseases in Chinese Middle-Aged and Elderly Men. J Nutr Health Aging 2018; 22:1189-1197. [PMID: 30498825 DOI: 10.1007/s12603-018-1062-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
BACKGROUND Aging is an acknowledged risk factor for most chronic diseases and functional impairments. The practicability of potential biomarkers of aging remains unsure. Moreover, biomarkers related to certain geriatric diseases, such as carotid atherosclerosis and multiple co-morbidities are less understood. The purpose of this study was to investigate the definite relationship between metabolic biomarkers and aging-related diseases. METHODS Eighty-five male adults aged fifty years or older from the general population were enrolled. Plasma metabolic biomarkers, including fourteen amino acids and thirty-six acylcarnitines, were measured by liquid chromatography mass spectrometry. Bivariate correlation analysis was employed to estimate the correlations between variables and age, and also to evaluate the relationship between metabolic biomarkers and aging-related diseases. Receiver operating characteristic (ROC) curve was conducted to judge the diagnostic efficiency of potential metabolic biomarkers for co-morbidities. RESULTS Certain metabolic biomarkers were strongly positively correlated with age, such as tetradecenoylcarnitine (C14:1), microalbumin-urine creatinine ratio (UACR), dodecenoylcarnitine (C12:1) and citrulline (p < 0.001). Carotid atherosclerosis and co-morbidities were positively correlated with aging (p < 0.001). After adjustment for age, hydroxytetradecanoylcarnitine (C14OH) remained positively correlated with carotid plague area. Besides, citrulline had diagnostic power for co-morbidities. CONCLUSIONS Citrulline may be a promising metabolic biomarker in the middle-aged and elderly men. Larger-scale and long-term studies are needed to confirm our findings.
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Affiliation(s)
- W Liu
- Prof. Meilin Liu, Department of Geriatrics, Peking University First Hospital; No. 8 Xishiku Street, Xicheng District, Beijing 100034, China, E-mail address:
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Li N, Zeng ZF, Wang SY, Ou W, Ye X, Li J, He XH, Zhang BB, Yang H, Sun HB, Fang Q, Wang BX. Randomized phase III trial of prophylactic cranial irradiation versus observation in patients with fully resected stage IIIA–N2 nonsmall-cell lung cancer and high risk of cerebral metastases after adjuvant chemotherapy. Ann Oncol 2015; 26:504-9. [DOI: 10.1093/annonc/mdu567] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Marino MP, Panigaj M, Ou W, Manirarora J, Wei CH, Reiser J. A scalable method to concentrate lentiviral vectors pseudotyped with measles virus glycoproteins. Gene Ther 2015; 22:280-5. [DOI: 10.1038/gt.2014.125] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 11/07/2014] [Accepted: 12/02/2014] [Indexed: 01/19/2023]
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Cao X, Ou W, Tian S, Wang C, Zhu Z, Wang J, Gou F, Yang D, Chen S. A new facility for studying plasma interacting with flowing liquid lithium surface. Fusion Engineering and Design 2014. [DOI: 10.1016/j.fusengdes.2014.06.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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He L, Ma Q, Wang Y, Liu X, Yuan Y, Zhang Y, Ou W, Liu L, Tan X, Wang X. Association of variants in KCNK17 gene with ischemic stroke and cerebral hemorrhage in a Chinese population. J Stroke Cerebrovasc Dis 2014; 23:2322-7. [PMID: 25179130 DOI: 10.1016/j.jstrokecerebrovasdis.2014.04.029] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 04/10/2014] [Accepted: 04/16/2014] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND KCNK17 (potassium channel, subfamily K, member17) has a role in the pathogenesis of stroke. We reported previously that rs10947803 single-nucleotide polymorphism (SNP) in KCNK17 is associated with cerebral hemorrhage in a Chinese population. The aim of the present study was to examine other SNPs in the KCNK17 gene that are associated with cerebral hemorrhage and other subtypes of stroke in the Chinese population. METHODS A total of 1356 subjects with stroke and 1225 control patients were examined by a case-control methodology. The SNPs (rs12214600, rs12195376, rs2758912, and rs10807204) in KCNK17 gene were genotyped with the TaqMan real-time polymerase chain reaction assay. RESULTS rs12214600 SNP in KCNK17 was significantly associated with cerebral hemorrhage (unadjusted odds ratio = .55, 95% confidence interval = .35-.86, P = .008, q = .0328) under the allele model. After adjusting for age, sex, and hypertension, we found that the association remained significant (odds ratio = .56, 95% confidence interval = .35-.90, P = .0158). There was no association detected for other SNPs in KCNK17 with cerebral hemorrhage, and none of the SNPs in KCNK17 had an association with ischemic stroke. CONCLUSIONS The T carrier of an SNP (rs12214600) is associated with reduced risk of cerebral hemorrhage in the Chinese population, together with previous findings that SNPs rs10947803 and rs12214600 in the KCNK17 gene are associated with hemorrhagic stroke, but none of the SNPs tested had an association with ischemic stroke. KCNK17 may be important in the pathogenesis of cerebral hemorrhage.
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Affiliation(s)
- Lingbin He
- The First Affiliated Hospital, Medical College of Shantou University, Shantou, Guangdong, China; Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China
| | - Qingfeng Ma
- Department of Neurology, Xuanwu Hospital, Beijing, China
| | - Yongqin Wang
- Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China; School of Basic Courses, Baotou Medical College, Baotou, Neimenggu, China
| | - Xin Liu
- Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China
| | - Yuan Yuan
- The First Affiliated Hospital, Medical College of Shantou University, Shantou, Guangdong, China; Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China
| | - Yongzhi Zhang
- The First Affiliated Hospital, Medical College of Shantou University, Shantou, Guangdong, China; Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China
| | - Wenjing Ou
- Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China; Public Health School; Harbin Medical University, Harbin, Heilongjiang, China
| | - Lisheng Liu
- Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China
| | - Xuerui Tan
- The First Affiliated Hospital, Medical College of Shantou University, Shantou, Guangdong, China.
| | - Xingyu Wang
- The First Affiliated Hospital, Medical College of Shantou University, Shantou, Guangdong, China; Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China; National Research Institute for Family Planning, Beijing, China.
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Ou W, Liu X, Shen Y, Li J, He L, Yuan Y, Tan X, Liu L, Zhao J, Wang X. Association of CVD candidate gene polymorphisms with ischemic stroke and cerebral hemorrhage in Chinese individuals. PLoS One 2014; 9:e105516. [PMID: 25144711 PMCID: PMC4140791 DOI: 10.1371/journal.pone.0105516] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2014] [Accepted: 07/06/2014] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Contribution of cardiovascular disease related genetic risk factors for stroke are not clearly defined. We performed a genetic association study to assess the association of 56 previously characterized gene variants in 34 candidate genes from cardiovascular disease related biological pathways with ischemic stroke and cerebral hemorrhage in a Chinese population. METHODS There were 1280 stroke patients (1101 with ischemic stroke and 179 with cerebral hemorrhage) and 1380 controls in the study. The genotypes for 56 polymorphisms of 34 candidate genes were determined by the immobilized probe approach and the associations of gene polymorphisms with ischemic stroke and cerebral hemorrhage were performed by logistic regression under an allelic model. RESULTS After adjusting for age, sex, BMI and hypertension status by logistic regression analysis, we found that NPPA rs5063 was significantly associated with both ischemic stroke (odds ratio [OR] 0.69; 95% confidence interval [CI], 0.52 to 0.90; P = 0.006) and cerebral hemorrhage(OR = 0.39; 95%CI, 0.19 to 0.78; P = 0.007). In addition, MTHFR rs1801133 also was associated with cerebral hemorrhage (OR = 1.48; 95%CI, 1.16 to 1.89; P = 0.001) but not with ischemic stroke (OR = 1.08; 95%CI, 0.96 to 1.22; P = 0.210). After false discovery rate (FDR) correction, the association of NPPA rs5063 and MTHFR rs1801133 with cerebral hemorrhage remained significant. CONCLUSIONS The NPPA rs5063 is associated with reduced risk for cerebral hemorrhage and MTHFR rs1801133 is associated with increased risk of cerebral hemorrhage in a Chinese population.
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Affiliation(s)
- Wenjing Ou
- Department of Epidemiology, Public Health School, Harbin Medical University, Heilongjiang, China
- Department of Epidemiology, Public Health School, Harbin Medical University, Heilongjiang, China
| | - Xin Liu
- The Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China
| | - Yue Shen
- The Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China
| | - Jiana Li
- Department of Epidemiology, Public Health School, Harbin Medical University, Heilongjiang, China
| | - Lingbin He
- First Affiliated Hospital, Medical College of Shantou University, Shantou, Guangdong, China
| | - Yuan Yuan
- First Affiliated Hospital, Medical College of Shantou University, Shantou, Guangdong, China
| | - Xuerui Tan
- First Affiliated Hospital, Medical College of Shantou University, Shantou, Guangdong, China
| | - Lisheng Liu
- The Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China
| | - Jingbo Zhao
- Department of Epidemiology, Public Health School, Harbin Medical University, Heilongjiang, China
- * E-mail: (XW); (JZ)
| | - Xingyu Wang
- First Affiliated Hospital, Medical College of Shantou University, Shantou, Guangdong, China
- The Laboratory of Human Genetics, Beijing Hypertension League Institute, Beijing, China
- * E-mail: (XW); (JZ)
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17
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Li J, Ma X, Ou W, Zhang M, Fu J, Zhao J. [Impact the variability of blood pressure on the outcome of ischemic stroke patients upon discharge from the hospital]. Zhonghua Liu Xing Bing Xue Za Zhi 2014; 35:77-80. [PMID: 24685043] [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] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To explore the relationship between blood pressure variability and worsening functional outcomes of patients upon discharge from the hospitals. METHODS The study cohort consisted of 404 patients who presented to Second Affiliated Hospital of Harbin Medical University with ischemic stroke during March 2012-March 2013. Systolic BP and diastolic BP were measured for each patient from admission to the fifth day and coefficient of variation blood pressure calculated. Disability at discharge was measured by the modified Rankin score (mRs). Chi-square test, t-test and multivariate logistic regression analysis were performed. RESULTS After adjustment for potential confounding factors including age, sex, activity, smoking, alcohol intake,BMI, heart rate, hypertension, diabetes mellitus, stroke history, lipid parameters, homocysteine and FPG, results from the multivariate logistic regression analysis showed that when DBP variability was greater than 9, it was associated with a significantly worse functional outcome at hospital discharge compared with those less than 9, with the odds ratio as 1.70 (95%CI:1.02-2.84). When comparing the ones that DBP variability more than 10 with the ones less than 10, the odds ratio was 1.86 (95% CI:1.11-3.13). However, there was no significant association seen between SBP variability and the worse functional outcome at hospital discharge. CONCLUSION Blood pressure variability might be associated with ischemic stroke outcome at hospital discharge but needed more evidence to approve.
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Affiliation(s)
- Jing Li
- Department of Epidemiology, School of Public Health
| | - Xiaoping Ma
- Department of Epidemiology, School of Public Health
| | - Wenjing Ou
- Department of Epidemiology, School of Public Health
| | - Mengsi Zhang
- Department of Epidemiology, School of Public Health
| | - Jin Fu
- Department of Neurology, Second Affiliated Hospital, Harbin Medical University, Harbin 150081, China.
| | - Jingbo Zhao
- Department of Epidemiology, School of Public Health.
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Ma X, Li J, Ou W, Zhang M, Zhao J. [A case-control study on the association between cigarette smoking and ischemic stroke]. Wei Sheng Yan Jiu 2014; 43:32-37. [PMID: 24564108] [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] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To investigate the association between cigarette smoking and ischemic stroke. METHODS A case-control study was conducted. Investigators got the available information from the cases and controls by questionnaires. Logistic regression models were used to analyze the relationship between smoking and ischemic stroke in this study. RESULTS A total number of 1037 cases and 1205 controls were included in this study. As the results showed, cigarette smoking was associated with ischemic stroke (OR = 1.368, 95% CI 1.158-1.616). After adjustment for age, body mass index, waist hip ratio, blood pressure, blood glucose, blood lipid, stroke family history and alcohol, the relationship between smoking and ischemic stroke was still significant (OR =2. 158, 95% CI 1.293-3.600). And the more you smoke, the more you stroke. Compared with nonsmokers, the ORs of smokers with 1-9 / day, 10-19 / day and 20 - / day were 1.097, 1.168 and 2.950. CONCLUSION Cigarette smoking is a risk factor for ischemic stroke.
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Affiliation(s)
- Xiaoping Ma
- Department of Epidemiology, College of Public Health, Hlarbin Medical University, Harbin 150081, China.
| | - Jing Li
- Department of Epidemiology, College of Public Health, Hlarbin Medical University, Harbin 150081, China
| | - Wenjing Ou
- Department of Epidemiology, College of Public Health, Hlarbin Medical University, Harbin 150081, China
| | - Mengsi Zhang
- Department of Epidemiology, College of Public Health, Hlarbin Medical University, Harbin 150081, China
| | - Jingbo Zhao
- Department of Epidemiology, College of Public Health, Hlarbin Medical University, Harbin 150081, China
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Ye S, Yang W, Wang Y, Ou W, Ma Q, Zhu W. [Construction of A eukaryotic expression vector carrying the iNOS gene and its effect on A549 lung cancer cells]. Zhongguo Fei Ai Za Zhi 2012; 15:260-6. [PMID: 22613330 PMCID: PMC6000129 DOI: 10.3779/j.issn.1009-3419.2012.05.02] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
背景与目的 iNOS与NO介导的抗肿瘤效应有关。本研究旨在构建pVAX-iNOS载体并转染A549肺癌细胞,检测其基因的表达并初步探讨iNOS基因表达增高后对A549肺癌细胞的抗肿瘤作用。 方法 应用RT-PCR方法扩增人iNOS编码序列的CDS片段,构建pVAX-iNOS载体后转染肺癌A549细胞,通过RT-PCR和Western blot方法检测目的基因的表达;采用MTT法、Hoechst 3235染色和划痕实验分别检测iNOS高表达在体外对肺癌A549细胞增殖、凋亡和迁移作用的影响。 结果 真核表达质粒载体pVAX-iNOS构建成功,iNOS蛋白在转染后的A549细胞中表达升高。pVAX-iNOS转染A549肺癌细胞后能明显诱导细胞发生凋亡并抑制肿瘤细胞的生长和迁移。 结论 本研究成功构建pVAX-iNOS真核表达质粒,高表达iNOS能明显抑制A549细胞的增殖、迁移并促进细胞发生凋亡。本研究有望为临床治疗肺癌提供一个新的有效策略。
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Affiliation(s)
- Sujuan Ye
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
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Xinzhou H, Ning Y, Ou W, Xiaodan L, Fumin Y, Huitu L, Wei Z. RKIP inhibits the migration and invasion of human prostate cancer PC-3M cells through regulation of extracellular matrix. Mol Biol 2011. [DOI: 10.1134/s0026893311060197] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Xinzhou H, Ning Y, Ou W, Xiaodan L, Fumin Y, Huitu L, Wei Z. RKIp inhibits the migration and invasion of human prostate cancer PC-3M cells through regulation of extracellular matrix. Mol Biol (Mosk) 2011; 45:1004-1011. [PMID: 22295570] [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: 05/31/2023]
Abstract
Raf kinase inhibitor protein (RKIP) plays a pivotal role in several intracellular signaling cascades and has been implicated as a metastasis suppressor in multiple cancer cells including prostate cancer cells, but the mechanism is not very clear. In this study, we investigated the effect of RKIP on cell proliferation, migration and invasion using human prostate cancer PC-3M cells as a model system. Our results indicate that RKIP does not effect cell proliferation in PC-3M cells, but inhibits both cell migration and cell invasion. In association with this inhibitory effect, RKIP down-regulates matrix metalloproteinases (MMP-2 and MMP-9), cathepsin B and urinary plasminogen activator (uPA). Also RKIP has the ability to regulate the expression of E-cadherin. But ectopic expression of RKIP does not affect the level of the Snail protein. As it has been indicated here, RKIP inhibits the migration and invasion ability of human prostate cancer cells through regulation of the extracellular matrix. These findings provide new mechanistic insight how RKIP suppresses metastasis in vitro.
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Affiliation(s)
- H Xinzhou
- Key Laboratory of Cell Proliferation and Regulation Biology, Ministry of Education, College of Life Sciences, Beijing Normal University, 100875
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22
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Fang Q, Wang S, Ou W, Yang H. Differential expression of EGFR mutations between primary and corresponding mediastinal nodal metastases in postoperative stage N2 non-small cell lung cancer. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e21034] [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: 11/20/2022] Open
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23
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Wang S, Yang H, Ou W, Fang Q. Front-line treatment for advanced pulmonary adenocarcinoma based on EGFR mutation status. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e18043] [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: 11/20/2022] Open
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24
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Yu C, Xiao W, Zhang D, Ou W, Feng Z, Zhu W. [Study on characterization of the complexes of FUS1/hIL-12 with cationic liposome]. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 2010; 27:859-864. [PMID: 20842860] [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] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This study was aimed to shed light on the biological and pharmaceutical characterization of the complexes of FUS1/hIL-12 double gene with cationic liposome, and to assess such complexes' transfection efficiency, stability and cytotoxicity; for they have the potential for use as drugs in gene therapy of lung cancer. Gel retardation assay, diameter measurement, and surface charge by photon correlation spectroscopy (PCS) were employed to select the appropriate ratio of "cationic liposome to DNA" of the double-gene and liposome complexes. The plasmid EGFP and plasmid PVITO2-hIL12-FUS1 mediated by cationic liposome were transfected into A549 lung cancer cells respectively, and the expression levels of EGFP and FUS1 and hIL-12 were determined by inverted fluorescence microscope and immunohistochemical and enzyme linked immunosorbent assay (ELISA) respectively. Agarose gel electrophoresis was performed to detect the stability of the double-gene and liposome complexes, after they were incubated with serum and Dnase I respectively. After the erythrocytes being incubated with the complexes of FUS1/hIL-12 with cationic liposome, the morphology of erythrocyte was observed by microscopy. The result of this study provides a basis for the use of the complexes of FUS1/hIL-12 with cationic liposome in gene therapy of lung cancer.
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Affiliation(s)
- Chuanjiang Yu
- State Key Laboratory of Biotherapy, West China Hospital, Sichuan University , Chengdu 610041, China
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Fang Q, Ou W, Radhakrishnan H, Huppert TJ, Hämäläinen M, Franceschini MA, Boas DA. A state-space approach for modeling simultaneous MEG and diffuse optical imaging measurements. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70584-1] [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: 11/28/2022] Open
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Abstract
7563 Background: We evaluate effect of postoperative adjuvant chemotherapy on overall survival after complete resection of stage III-N2 non-small-cell lung cancer. Methods: From Jan.1999 to Dec. 2003, a total of 150 stage III-N2 non-small cell lung cancer patients randomly received four cycles of chemotherapy (NVB25mg/m2, D1,D5 or paclitaxel 175mg/m2, D1 / carboplatin AUC=5, D1) or observation after operation. Results: The median survival for the 150 patients was 879 days, with a 1-year survival rate of 81%, 3-year survival rate of 43%, and 5-year survival rate of 28%.There was significant difference in median survival between chemotherapy and control group (897 days vs 821 days p=0.04), and also there was significant difference in 5-year survival rate (30% vs 24% p<0.05). The most common site of recurrence was brain. 26% (39/150) of patients recurred in the brain as their first site, 22% (18/79) for chemotherapy group, 29% (21/71) for control group. The median survival time for brain metastasis patients between chemotherapy and control group is no difference (812 days vs 512 days, p=0.122), but there was significant difference in 2-year survival rate (66.71% vs 37.6% p<0.05). Conclusions: Postoperative adjuvant chemotherapy dose significantly improves median survival among completely resected stage III-N2 non-small-cell lung cancer patients, and significantly improves 5-year survival rate. It dose not decrease incidence of brain metastasis but postpone the time of brain metastasis in chemotherapy group. No significant financial relationships to disclose.
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Affiliation(s)
- S. Wang
- Cancer Center Sun Yat-Sen University, Guangzhou, China; Guangdong Province People's Hospital, Guangzhou, China
| | - W. Ou
- Cancer Center Sun Yat-Sen University, Guangzhou, China; Guangdong Province People's Hospital, Guangzhou, China
| | - H. Sun
- Cancer Center Sun Yat-Sen University, Guangzhou, China; Guangdong Province People's Hospital, Guangzhou, China
| | - H. Yang
- Cancer Center Sun Yat-Sen University, Guangzhou, China; Guangdong Province People's Hospital, Guangzhou, China
| | - X. Ye
- Cancer Center Sun Yat-Sen University, Guangzhou, China; Guangdong Province People's Hospital, Guangzhou, China
| | - Q. Fang
- Cancer Center Sun Yat-Sen University, Guangzhou, China; Guangdong Province People's Hospital, Guangzhou, China
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Wang S, Ye X, Ou W, Lin Y, Zhang B, Yan H. Risk of cerebral metastases for postoperative locally advanced non-small cell lung cancer. J Clin Oncol 2008. [DOI: 10.1200/jco.2008.26.15_suppl.8113] [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: 11/20/2022] Open
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28
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Guo Z, Ou W, Lu S, Zhong Q. Differential responses of antioxidative system to chilling and drought in four rice cultivars differing in sensitivity. Plant Physiol Biochem 2006; 44:828-36. [PMID: 17098438 DOI: 10.1016/j.plaphy.2006.10.024] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2006] [Accepted: 10/10/2006] [Indexed: 05/12/2023]
Abstract
Responses of antioxidative defense systems to chilling and drought stresses were comparatively studied in four cultivars of rice (Oryza sativa L.) differing in sensitivity, two of them (Xiangnuo no. 1 and Zimanuo) are tolerant to chilling but sensitive to drought and the other two (Xiangzhongxian no. 2 and IR50) are tolerant to drought but sensitive to chilling. The seedlings of rice were transferred into growth chamber for 5 d at 8 degrees C as chilling treatment, or at 28 degrees C as control, or at 28 degrees C but cultured in 23% PEG-6000 solution as drought stress treatment. Under drought stress the elevated levels of electrolyte leakage, contents of H(2)O(2) and total thiobarbituric acid-reacting substances (TBARS) in Xiangzhongxian no. 2 and IR50 are lower than those in Xiangnuo no. 1 and Zimanuo. On the contrary, Xiangnuo no. 1 and Zimanuo have much lower level of electrolyte leakage, H(2)O(2) and TBARS than Xiangzhongxian no. 2 and IR50 under chilling stress. Activities of antioxidant enzymes (superoxide dismutase (SOD), catalase, and ascorbate-peroxidase (APX)) and contents of antioxidants (ascorbaic acid and reduced glutathione) were measured during the stress treatments. All of them were enhanced greatly until 3 d after drought stress in the two drought-tolerant cultivars, or after chilling stress in the two chilling-tolerant cultivars. They all were decreased at 5 d after stress treatments. On the other hand, activities of antioxidant enzymes and contents of antioxidants were decreased greatly in the drought-sensitive cultivars after drought stress, or in the chilling-sensitive cultivars after chilling stress. The results indicated that tolerance to drought or chilling in rice is well associated with the enhanced capacity of antioxidative system under drought or chilling condition, and that the sensitivity of rice to drought or chilling is linear correlated to the decreased capacity of antioxidative system.
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Affiliation(s)
- Z Guo
- Biotechnology Laboratory for Turfgrass and Forages, College of Life Science, South China Agricultural University, Guangzhou 510642, China.
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Abstract
Fatty acid synthase (FASN), a key enzyme for de novo lipogenesis, is overexpressed in many malignant tumours and is associated with aggressive biological behaviour. FASN expression and its possible relationship with more aggressive behaviour in gastrointestinal stromal tumours (GISTs) have not been addressed to date. Here, FASN expression was assessed by immunohistochemistry in 60 primary GISTs (28 low/intermediate risk and 32 high risk) and seven metastatic GISTs. Sixteen smooth muscle gastrointestinal tumours were used as controls. FASN was overexpressed in 36 of 60 GISTs (60%): in 12 of 28 (42%) low/intermediate-risk GISTs and in 24 of 32 (75%) high-risk GISTs (p<0.05). Two primary and seven metastatic GISTs and five GIST cell lines (GIST882, GIST430, GIST522, GIST62, and GIST48), analysed by western blot, showed variable FASN expression. Most metastatic samples expressed high levels of FASN protein. Additionally, seven of 60 GISTs showed a proliferation rate higher than 10% by Ki67 and all of them expressed FASN (p<0.04). Finally, proliferation and apoptosis were investigated after FASN silencing in GIST882 cells, which displayed the highest FASN expression. siRNA-mediated FASN knock-down inhibited expression of the proliferation marker cyclin A, whereas no changes in p27 and cleaved PARP expression were seen. It is concluded that FASN is preferentially overexpressed in high-risk and metastatic GISTs, and that its overexpression likely contributes to cell proliferation.
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Affiliation(s)
- S Rossi
- Department of Pathology, Regional Hospital, Treviso, Italy, and Department of Medical Oncology, Harvard Medical School, Boston, MA, USA
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Tsuji K, Yamamoto S, Ou W, Nishi N, Kobayashi I, Zaitsu M, Muro E, Sadakane Y, Ichimaru T, Hamasaki Y. dsRNA enhances eotaxin-3 production through interleukin-4 receptor upregulation in airway epithelial cells. Eur Respir J 2006; 26:795-803. [PMID: 16264039 DOI: 10.1183/09031936.05.00010805] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The exacerbation of asthma during viral infections is mainly explained by neutrophils infiltrating into the airways. However, enhanced functions of eosinophils are also observed. The aim of this study was to reveal the mechanism of how eosinophils are activated during and after viral infection of the airways, using a model of viral infection. A synthetic double-stranded RNA, poly inosinic-cytidyric acid (poly(IC)), was transfected to a human airway epithelial cell line (BEAS-2B) and the primary bronchial epithelial cells, to mimic a viral infection. The production of chemokines from the cells was investigated. The transfection of poly(IC), alone, marginally affected the eotaxin-3 production of the cells. However, the transfection of poly(IC) prior to interleukin (IL)-4 stimulation enhanced eotaxin-3 production. Poly(IC) transfection increased mRNA and protein expressions of IL-4 receptor (R)alpha and IL-2Rgamma, components of the IL-4R. In BEAS-2B cells, IL-4-mediated phosphorylation of signal transducer and activator of transcription six was enhanced in poly(IC) transfected cells. This was reversed by the addition of anti-IL-4Ralpha antibody, suggesting the role of an increased number of IL-4 receptors in enhanced IL-4-induced eotaxin-3 production. Poly(IC)-induced upregulation of IL-4Ralpha was inhibited by treatment with cycloheximide or dexamethasone. In conclusion, these results suggest that viral airway infection may enhance interleukin-4-induced eotaxin-3 production through upregulation of the interleukin-4 receptor in airway epithelial cells.
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Affiliation(s)
- K Tsuji
- Dept of Pediatrics, Saga University School of Medicine, 5-1-1 Nabeshima, Saga-City, Saga 849-8501, Japan
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Zhong W, Qiao G, Xie D, Guan X, Ou W, Yang X, Lin J, Henning W, Stuerzbecher H, Wu Y. P-142 Prognostic role of e-cadherin in resected non-small-cell lungcancer detected by immunohistochemistry on high-throughput tissue microarray. Lung Cancer 2005. [DOI: 10.1016/s0169-5002(05)80636-1] [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: 10/25/2022]
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Huang H, Ou W, Zhao J, Chen D, Wang L. A comparative study of quantitative structure-activity relationship methods based on gallic acid derivatives. SAR QSAR Environ Res 2004; 15:83-99. [PMID: 15199945 DOI: 10.1080/10629360410001665875] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
By using hologram quantitative structure-activity relationship (HQSAR) and comparative molecular field analysis (CoMFA) methods, the relationships between the structures of 49 gallic acid derivatives and their analgesic activity have been investigated to yield statistically reliable models with considerable predictive power. The best HQSAR model was generated using atoms, bond and connectivity as fragment distinction parameters and fragment size 5-7 from a hologram length of 307 with 3 components. High conventional r2 (r2 = 0.825) and cross-validation r2 (r2(cv) = 0.726) values were obtained. CoMFA analyses varying lattice size and location, grid spacing, probe charges and using, Tripos standard and Indicator force field were performed. The best model was developed with 4 components using sp3-hybridized carbon atom with +1.0 charge as probe, grid spacing (2 A), lattice offset (1.0, 3.0, -2.5). The CoMFA model showed a conventional correlation coefficient r2 of 0.889 and across-validation r2(cv) equals to 0.633. The robustness and predictive ability of the HQSAR and CoMFA models have been validated by means of an external test set. The results indicate that both models possess high statistical quality in the prediction of analgesic potency of novel gallic acid analogs.
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Affiliation(s)
- H Huang
- State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, People's Republic of China.
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Wang S, Wu Y, Ou W. [Skip metastasis to the mediastinal lymph nodes in non-small cell lung cancer]. Zhonghua Zhong Liu Za Zhi 2001; 23:259-61. [PMID: 11783103] [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] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To ascertain if any difference exists in clinical characteristics between resected non-small cell lung cancer (NSCLC) with either skip or ordinary mediastinal lymph node metastases. METHODS Among 176 patients with stage IIIAN2 disease between 1982-1994 treated in our hospital, 53 had no metastasis at the hilar lymph nodes [skip(+) group] while 123 had [skip(-) group]. To investigate the extent of nodal involvement, the mediastinal lymph nodes were divided into three regions. RESULTS In the skip(+) group, mediastinal node metastasis was found in only one region in 49 of the 53 patients(92.4%), whereas 45 of the 123 patients(36.6%) from the skip (-) group revealed medinastinal metastasis at two or three regions The overall survival rate at 5 years after operation was 29.3% in the skip(+) group and 12.2% in the skip (-) group (P = 0.038). Furthermore, regarding patients with mediactint node metantion in one region, the skip(+) group had a better prognosis than the skip (-) group (32.1% vs 15.3%, P = 0.042). CONCLUSION These results suggest that patients with skip mediastinal lymph node metastases represent a unique subgroup of N2 disease.
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Affiliation(s)
- S Wang
- Cancer Center, Sun Yet-sen University of Medical Sciences, Guangzhou 510060, China
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Wu YI, Wang SY, Huang ZF, Yang XN, Ou W, Yu H. The importance of systematic mediastinal lymphadenectomy in resectable non-small Cell Lung Cancer — Results of a prospective randomized trial. Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80453-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wang SY, Wu YI, Ou W, Yang XN. Skip metastasis to the mediastinal lymph nodes in NSCLC. Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80456-0] [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: 10/27/2022]
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Wang S, Wu Y, Ou W, Yang X, Yu H. [Survival and prognosis after pneumonectomy for non-small cell lung cancer (NSCLC) in the elderly]. Zhongguo Fei Ai Za Zhi 2000; 3:195-7. [PMID: 20950549 DOI: 10.3779/j.issn.1009-3419.2000.03.09] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND To study the probability and prognosis after pneumonectomy for NSCLC in the elderly. METHODS From 1985 to 1995 , pneumonectomy was performed in 122 patients with non-small cell lung cancer. Of the 122 patients , 23 cases were 65 years old or older ( study group) and the other 99 cases were less than 65 years old. Five-year survival , operative complications and mortality , and change of lung functions before and after operation were compared between the two groups. Kaplan-meier method was used to analyzed the survival. RESULTS The 5-year survival for the study group was similar to that for the control group (27. 56 % vs 30. 51 % , P > 0. 05) , but the mortality in the study group was significantly higher than that in the control group (13. 04 % vs 2. 02 % , P < 0. 05) . There was no significant difference between the pre-operative and post-operative lung function for both groups. CONCLUSIONS Pneumonectomy in elderly patients with NSCLC appears to be applicable. However , it shoud be performed only in carefully selected patients because of the increased operative risk and death.
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Affiliation(s)
- S Wang
- Lung Cancer Research Center , Sun Yet-sen University of Medical Sciences , Guangzhou , Guangdong 510060 , P. R. China
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Nakamura K, Matsushita T, Mamada K, Okazaki H, Ou W, Okuma Y, Kurokawa T. Changes of callus diameter during axial loading and after fixator removal in leg lengthening. Arch Orthop Trauma Surg 1998; 117:464-7. [PMID: 9801783 DOI: 10.1007/s004020050294] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [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] [Indexed: 10/28/2022]
Abstract
We retrospectively reviewed nine tibial lengthenings in seven achondroplastic patients. The callotasis method was used, and a unilateral type lengthener, either the Dynamic Axial Fixator (Orthofix, Italy; eight legs) or the High Functional Fixator (Matsumoto Co., Japan; one leg), was applied. The distracted length averaged 14.6 (range 10-18) cm. The minimum diameter of the callus was measured using a ruler on anteroposterior and lateral radiographs. The callus diameter ratio (%) was calculated as the callus diameter divided by the original diaphysis diameter. For periods during axial loading and after removal of the fixator in each patient, a single regression line was drawn on the callus diameter ratio data using the least squares method, and the diameter change rate (%/day) was evaluated by inclination of this line. The diameter change rates during axial loading were negative in six legs, but those after fixator removal were positive in all legs, and the latter were significantly greater than the former. The diameter change rates after fixator removal on the anteroposterior radiographs were negatively correlated with the callus diameter ratio at the time of fixator removal (r = 0.84, P = 0.0008). Simple axial loading may not be a sufficient mechanial environment for restoration of the physiological shape, and it is important to be aware that we cannot expect the callus diameter to increase by this means alone.
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Affiliation(s)
- K Nakamura
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Tokyo, Japan
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Mamada K, Nakamura K, Matsushita T, Okazaki H, Shiro R, Ou W, Tanaka K, Kurokawa T. The diameter of callus in leg lengthening: 28 tibial lengthenings in 14 patients with achondroplasia. Acta Orthop Scand 1998; 69:306-10. [PMID: 9703409 DOI: 10.3109/17453679809000936] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We investigated the relation between callus diameter during bone distraction and the occurrence of late fracture and deformity. We retrospectively reviewed 28 tibial lengthenings in 14 patients with achondroplasia. The minimal diameter of the lengthened zone was measured on radiographs, when the sliding mechanism of the lengthening device was released, and the callus diameter ratio in two planes (CDR; diameter of the callus/diameter of the tibia at the level of the osteotomy end) was calculated. The CDR correlated negatively with the distracted length. Late fracture or late angular deformity occurred in 6 of the 28 lengthenings. When the CDR was 85% or more in both planes, these complications did not occur, but when the CDR was 80% or less in either plane, they occurred in 6 of 20 bones. Careful attention should therefore be given not only to the continuity of the callus but also to its diameter.
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Affiliation(s)
- K Mamada
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Tokyo, Japan
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Hung SC, Nakamura K, Matsushita T, Okazaki H, Shiro R, Mamada K, Tanaka K, Ou W, Kurokawa T. Influence of femoral lengthening on hip joint space in posttraumatic femoral shortening. Acta Orthop Scand 1997; 68:541-4. [PMID: 9462353 DOI: 10.3109/17453679708999023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We performed femoral lengthening for post-traumatic femoral shortening in 14 patients (10 men). The mean age was 26 (17-33) years. The callotasis method was employed using an Orthofix or Hifixator monolateral external fixator. The average length gained was 6 (3-13) cm, equal to 16 (7-36)%. The mean narrowing ratio of the hip joint space during lengthening was 9 (0-26)% and the narrowing persisted at the final follow-up. Cases with narrowing greater than 5% had a longer time between the development of the shortening and the lengthening than the others (p = 0.03). Our findings indicate that femoral lengthening for posttraumatic femoral shortening should be done as early as possible to prevent the development of joint space narrowing during the lengthening procedure.
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Affiliation(s)
- S C Hung
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Tokyo, Japan.
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Tanaka K, Kurokawa T, Nakamura K, Matsushita T, Horinaka S, Kusaba I, Okazaki H, Mamada K, Shiro R, Ou W, Hung SC. Callus formation in femur and tibia during leg lengthening: 7 patients examined with DXA. Acta Orthop Scand 1996; 67:158-60. [PMID: 8623571 DOI: 10.3109/17453679608994662] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We examined the callus formation during leg lengthening in 7 achondroplastic patients who underwent 3 bilateral femoral and 4 bilateral tibial lengthenings. Bone mineral content and bone mineral density (BMD) in the lengthened callus space were evaluated every 1 or 2 weeks for 10 weeks after the start of distraction using dual energy X-ray absorptiometry. The mean rate of callus mineralization in femurs (0.64 g/wk) was higher than in tibias (0.22 g/wk). The mean BMD at 10 weeks after the start was 0.35 g/cm2 in the femur and 0.14 g/cm2 in the tibia. Different rates of callus formation in different kinds of long tubular bones have not been reported previously.
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Affiliation(s)
- K Tanaka
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Tokyo, Japan
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Nakamura K, Kurokawa T, Matsushita T, Ou W, Okazaki H, Takahashi M. Prevention of equinus deformity during tibial lengthening. Comparison of passive stretching with an orthosis. Int Orthop 1996; 20:359-62. [PMID: 9049764 DOI: 10.1007/s002640050097] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We have reviewed 28 tibial lengthenings in 14 patients with achondroplasia at an average age of 15 years, and compared the effectiveness of physiotherapy and an orthosis in preventing an equinus deformity. Physiotherapy of 15 min a day was ineffective even when the patients were able to walk. An orthosis worn for 16 h a day prevented equinus deformity up to at least 50% of lengthening, and the difference from physiotherapy was significant at more than 30% of lengthening.
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Affiliation(s)
- K Nakamura
- Department of Orthopaedic Surgery, Faculty of Medicine, University of Tokyo, Japan
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Park NG, Aoyagi H, Lee S, Kato T, Jinkawa S, Ou W, Ito A. Effects of model extension peptides containing glycine, proline and serine residues on the import of mitochondrial enzyme precursors into mitochondria. Pept Res 1989; 2:178-83. [PMID: 2520755] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We found previously that Ac-(Leu-Leu-Ala-Arg-Leu)3-NHCH3 (5(3)), a model of the extension peptide of cytochrome P-450(SCC) precursor, strongly inhibited the import of the precursor into mitochondria. Unexpectedly, however, 5(3) showed the break of respiratory control of mitochondria. In the present study, desAc- [Pro7, Ser10] 5(3) (1), [Pro7, Ser10] 5(3) (2), desAc- [Gly5, Pro7, Ser10] 5(3) (3) and [Gly5, Pro7, Ser10] 5(3) (4) were synthesized in order to investigate the influence of the Gly, Pro and Ser residues, which are present in the extension peptide, on the import and respiration. CD measurement indicated that all the peptides had an alpha-helical conformation in the presence of DPPC-DPPG (3:1) liposomes. The order of the content of alpha-helical conformation was 5(3) greater than 1, 2 greater than 3, 4, while SEP1-15 (N-terminal 1-15 fragment of the extension peptide of cytochrome P-450(SCC) precursor) showed no alpha-helical structure. The measurements of dye-leakage from liposomes, import-inhibition of P-450(SCC) and adrenodoxin precursors and respiratory inhibition of mitochondria indicated that 3 and 4, rather than 1 and 2, are similar to SEP1-15, and that the glycine residue in the extension peptide is of considerable importance for the import of the precursors.
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Abstract
Galactosylsphingosine, glucosylsphingosine and sphingosine all inhibited cytochrome c oxidase activity in mitochondria from rat liver; more than 50% inhibition was caused by 5 microM lipid (0.1 mumol/mg mitochondrial protein). However, these lysosphingolipids did not suppress the activity of purified cytochrome c oxidase. When the enzyme was "reconstituted" with phosphatidylcholine, the lysosphingolipids clearly inhibited the activity. On the other hand, galactosylsphingosine, glucosylsphingosine and sphingosine all hemolyzed erythrocytes, indicating that lysosphingolipids can disrupt the membrane. Thus, it appears that the inhibition of cytochrome c oxidase, a membrane-bound enzyme in mitochondria, is due to perturbation of the environment of the enzyme and that the primary attacking site of the lysosphingolipids is the membrane. Because the potency to inhibit cytochrome c oxidase and to hemolyze erythrocytes did not differ among these lysosphingolipids and because galactosylceramide caused neither inhibition of cytochrome c oxidase nor hemolysis, the free amino group in the lysosphingolipids seems to be essential to give the effects. In addition, both inhibition of cytochrome c oxidase and hemolysis caused by lysosphingolipids were completely abolished by albumin, suggesting that toxic effects of lysosphingolipids may not be apparent in blood.
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Affiliation(s)
- H Igisu
- Department of Environmental Toxicology, University of Occupational and Environmental Health, Kitakyushu, Japan
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Ito A, Ogishima T, Ou W, Omura T, Aoyagi H, Lee S, Mihara H, Izumiya N. Effects of synthetic model peptides resembling the extension peptides of mitochondrial enzyme precursors on import of the precursors into mitochondria. J Biochem 1985; 98:1571-82. [PMID: 4093445 DOI: 10.1093/oxfordjournals.jbchem.a135426] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
One common and characteristic feature of the extension peptides of mitochondrial enzyme precursors is the presence of repeating short stretches of uncharged amino acids linked by basic amino acids. We synthesized several model peptides having this particular feature of the extension peptides. The peptides contained arginine or lysine as a basic amino acid residue linking sequences of two to four residues of leucine and alanine. We examined the effects of the peptides on the import of the precursors of two mitochondrial enzymes, cytochrome P-450(SCC) and adrenodoxin, and found that the peptides were generally inhibitory to the import of the precursors into mitochondria. The effective concentrations of some of the inhibitory peptides were as low as a few microM. The peptides containing lysine instead of arginine had an essentially similar inhibitory effect on the import. The peptides did not inhibit the binding of pre-P450(SCC) to the surface of mitochondria. The synthetic model peptides uncoupled oxidative phosphorylation of mitochondria prepared from either rat liver or bovine adrenal cortex, and induced leakage of enzymes from the inner compartments of mitochondria. However, the synthetic model peptides did not solubilize membrane-bound enzymes from mitochondria, suggesting that their effect on the membranes is different from that of detergents. The synthetic model peptides seem to bind to the membranes causing significant perturbation in the membrane structure, which is possibly related to the functions of the particular common sequence found in the extension peptides of mitochondrial enzyme precursors.
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Gillis S, Ferm MM, Ou W, Smith KA. T cell growth factor: parameters of production and a quantitative microassay for activity. J Immunol 1978; 120:2027-32. [PMID: 307029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Several soluble factors have recently been associated with the proliferation and differentiation of thymus-derived lymphocytes. One of these factors present in medium conditioned by T cell mitogen-stimulated lymphocytes has the ability to promote the long-term culture of normal and antigen-specific cytotoxic T cells. We report a method to test for this proliferative stimulus in the form of a sensitive microassay based upon the tritiated-thymidine incorporation of continuous murine tumor-specific cytotoxic T cell lines (CTLL). The microassay requires microliter quantitites of sample fluid and is amenable to quantitative analysis. This highly reproducible, quantitative assay for T cell growth factor (TCGF) has allowed investigation as to the kinetics of TCGF generation and has revealed that T lymphocytes are required for its production. Further investigation has supported the notion that this nonspecies-specific factor is actively removed from tissue culture medium by the proliferation of either T cell mitogen-activated lymphocytes or CTLL.
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