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Li LB, Yang LX, Liu L, Liu FR, Li AH, Zhu YL, Wen H, Xue X, Tian ZX, Sun H, Li PC, Zhao XG. Targeted inhibition of the HNF1A/SHH axis by triptolide overcomes paclitaxel resistance in non-small cell lung cancer. Acta Pharmacol Sin 2024; 45:1060-1076. [PMID: 38228910 PMCID: PMC11053095 DOI: 10.1038/s41401-023-01219-y] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 12/17/2023] [Indexed: 01/18/2024] Open
Abstract
Paclitaxel resistance is associated with a poor prognosis in non-small cell lung cancer (NSCLC) patients, and currently, there is no promising drug for paclitaxel resistance. In this study, we investigated the molecular mechanisms underlying the chemoresistance in human NSCLC-derived cell lines. We constructed paclitaxel-resistant NSCLC cell lines (A549/PR and H460/PR) by long-term exposure to paclitaxel. We found that triptolide, a diterpenoid epoxide isolated from the Chinese medicinal herb Tripterygium wilfordii Hook F, effectively enhanced the sensitivity of paclitaxel-resistant cells to paclitaxel by reducing ABCB1 expression in vivo and in vitro. Through high-throughput sequencing, we identified the SHH-initiated Hedgehog signaling pathway playing an important role in this process. We demonstrated that triptolide directly bound to HNF1A, one of the transcription factors of SHH, and inhibited HNF1A/SHH expression, ensuing in attenuation of Hedgehog signaling. In NSCLC tumor tissue microarrays and cancer network databases, we found a positive correlation between HNF1A and SHH expression. Our results illuminate a novel molecular mechanism through which triptolide targets and inhibits HNF1A, thereby impeding the activation of the Hedgehog signaling pathway and reducing the expression of ABCB1. This study suggests the potential clinical application of triptolide and provides promising prospects in targeting the HNF1A/SHH pathway as a therapeutic strategy for NSCLC patients with paclitaxel resistance. Schematic diagram showing that triptolide overcomes paclitaxel resistance by mediating inhibition of the HNF1A/SHH/ABCB1 axis.
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Affiliation(s)
- Ling-Bing Li
- Department of Thoracic Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China
| | - Ling-Xiao Yang
- Department of Thoracic Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China
| | - Lei Liu
- Department of Thoracic Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China
| | - Fan-Rong Liu
- Department of Thoracic Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China
| | - Alex H Li
- Division of Environmental Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY, 10010, USA
| | - Yi-Lin Zhu
- Department of Thoracic Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China
| | - Hao Wen
- Department of Thoracic Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China
| | - Xia Xue
- Department of Pharmacy, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China
| | - Zhong-Xian Tian
- Department of Thoracic Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China
- Key Laboratory of Chest Cancer, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China
| | - Hong Sun
- Division of Environmental Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY, 10010, USA
| | - Pei-Chao Li
- Department of Thoracic Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China.
- Key Laboratory of Chest Cancer, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China.
| | - Xiao-Gang Zhao
- Department of Thoracic Surgery, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China.
- Key Laboratory of Chest Cancer, The Second Hospital, Cheeloo College of Medicine, Shandong University, Ji-nan, 250012, China.
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2
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Li SQ, Zhao XG, Wang YQ, Zhao YY, Wei Y. [A case of hemophagocytic lymphohistiocytosis secondary to infectious mononucleosis with T lymphocytosis]. Zhonghua Er Ke Za Zhi 2022; 60:146-148. [PMID: 35090235 DOI: 10.3760/cma.j.cn112140-20210717-00586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Affiliation(s)
- S Q Li
- Department of Pediatric Hematology, the Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - X G Zhao
- Department of Pediatric Hematology, the Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Y Q Wang
- Department of Pediatric Hematology, the Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Y Y Zhao
- Department of Pediatric Hematology, the Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
| | - Yuanyu Wei
- Department of Clinical Laboratory, the Third Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
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Jiang SY, Shen YH, Rao TW, Zhao XG. Therapeutic role of atrial natriuretic peptide in early treatment of traumatic hemorrhagic shock. EUR J INFLAMM 2021. [DOI: 10.1177/20587392211004402] [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] [Indexed: 11/16/2022] Open
Abstract
The biological effect of atrial natriuretic peptide (ANP) in traumatic hemorrhagic shock (THS) is unknown. This study was to evaluate whether ANP therapy can show organ protection in THS. Thirty male Sprague-Dawley rats were divided into three groups: ANP group, sham group, and control group. Pressure-controlled THS was induced in rats in ANP group and control group. ANP at a rate of 0.025 μg/kg/min was infused in ANP group during near-80 min of shock. After that, animals were resuscitated for 60 min and observed until 24 h. Hemodynamic parameters during shock and resuscitation were measured. Serum levels of ANP and lactate dehydrogenase, tissue oxidative stress and inflammatory factors, as well as liver and kidney function were determined. Tissue apoptosis was also assessed. There was no statistically significant difference between ANP group and control group in arterial pressure throughout the 150 min monitoring period. Blood urea nitrogen at 90 min and 24 h in ANP group was significantly lower than control group. Alanine transaminase and aspartate aminotransferase activity at 90 min in control group were significantly higher than that in sham group. However, hepatic enzyme activity at 90 min in ANP group was not significantly different compared with sham or control group. After 24 h, myocardial expression of caspase 3 protein in ANP group was significantly reduced compared with control group. Jejunal and hepatic Malondialdehyde was increased following ANP treatment. ANP therapy during early THS has no significant adverse effect on hemodynamics but can exert oxidative stress and certain protective effect on multiple organs. Our study may shed light on the novel therapy of THS with regard to organ protection. The mechanisms underlying the organ protection require further study.
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Affiliation(s)
- Shou-Yin Jiang
- Department of Emergency Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
- Research Institute of Emergency Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Ye-Hua Shen
- Department of Radiology, The Children’s Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
- National Clinical Research Center for Child Health, Hangzhou, China
| | - Tai-Wen Rao
- Department of Emergency Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
- Research Institute of Emergency Medicine, Zhejiang University, Hangzhou, Zhejiang, China
| | - Xiao-Gang Zhao
- Department of Emergency Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang, China
- Research Institute of Emergency Medicine, Zhejiang University, Hangzhou, Zhejiang, China
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Zhong XM, Wen XH, Ji CH, Fei XZ, Zhao XG. A temporary-sustainable team: A new multidisciplinary team model for severe trauma. Chin J Traumatol 2020; 23:363-366. [PMID: 33214008 PMCID: PMC7718525 DOI: 10.1016/j.cjtee.2020.09.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Revised: 05/30/2020] [Accepted: 07/31/2020] [Indexed: 02/04/2023] Open
Abstract
The treatment of severe trauma, especially multiple injuries, requires multidisciplinary collaboration. The current study aims to highlight the challenges of consultation mode for severe trauma in general hospitals and emphasizes the need to create a new temporary-sustainable team. It suggests developing an information consultation mode and enforcing the fine management to improve the quality and safety of the medical treatment. The management mode of a temporary-sustainable team will reduce the cost and improve the treatment efficiency. Overall, a temporary-sustainable team has significant advantages over a traditional multidisciplinary team for severe trauma treatment.
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Affiliation(s)
- Xing-Ming Zhong
- Department of Emergency and Department of Neurosurgery, The First People's Hospital of Huzhou, First Affiliated Hospital of Huzhou Normal University, Huzhou 313000, Zhejiang Province, China
| | - Xiao-Hong Wen
- Department of Emergency and Department of Neurosurgery, The First People's Hospital of Huzhou, First Affiliated Hospital of Huzhou Normal University, Huzhou 313000, Zhejiang Province, China,Corresponding author.
| | - Chao-Hui Ji
- Department of Emergency and Department of Neurosurgery, The First People's Hospital of Huzhou, First Affiliated Hospital of Huzhou Normal University, Huzhou 313000, Zhejiang Province, China
| | - Xing-Zhen Fei
- Department of Emergency and Department of Neurosurgery, The First People's Hospital of Huzhou, First Affiliated Hospital of Huzhou Normal University, Huzhou 313000, Zhejiang Province, China
| | - Xiao-Gang Zhao
- Department of Emergency, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, Zhejiang Province, China
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McLeod AS, Zhang J, Gu MQ, Jin F, Zhang G, Post KW, Zhao XG, Millis AJ, Wu WB, Rondinelli JM, Averitt RD, Basov DN. Multi-messenger nanoprobes of hidden magnetism in a strained manganite. Nat Mater 2020; 19:397-404. [PMID: 31844275 DOI: 10.1038/s41563-019-0533-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 10/09/2019] [Indexed: 06/10/2023]
Abstract
The ground-state properties of correlated electron systems can be extraordinarily sensitive to external stimuli, offering abundant platforms for functional materials. Using the multi-messenger combination of atomic force microscopy, cryogenic scanning near-field optical microscopy, magnetic force microscopy and ultrafast laser excitation, we demonstrate both 'writing' and 'erasing' of a metastable ferromagnetic metal phase in strained films of La2/3Ca1/3MnO3 (LCMO) with nanometre-resolved finesse. By tracking both optical conductivity and magnetism at the nanoscale, we reveal how strain-coupling underlies the dynamic growth, spontaneous nanotexture and first-order melting transition of this hidden photoinduced metal. Our first-principles calculations reveal that epitaxially engineered Jahn-Teller distortion can stabilize nearly degenerate antiferromagnetic insulator and ferromagnetic metal phases. We propose a Ginzburg-Landau description to rationalize the co-active interplay of strain, lattice distortions and magnetism nano-resolved here in strained LCMO, thus guiding future functional engineering of epitaxial oxides into the regime of phase-programmable materials.
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Affiliation(s)
- A S McLeod
- Department of Physics, Columbia University, New York, NY, USA.
| | - Jingdi Zhang
- Department of Physics, University of California San Diego, La Jolla, CA, USA.
- Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
| | - M Q Gu
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - F Jin
- Hefei National Laboratory for Physical Sciences at Microscale and High Magnetic Field Laboratory of CAS, University of Science and Technology of China, Hefei, China
| | - G Zhang
- Department of Physics, University of California San Diego, La Jolla, CA, USA
| | - K W Post
- Department of Physics, University of California San Diego, La Jolla, CA, USA
| | - X G Zhao
- Department of Mechanical Engineering, Boston University, Boston, MA, USA
| | - A J Millis
- Department of Physics, Columbia University, New York, NY, USA
| | - W B Wu
- Hefei National Laboratory for Physical Sciences at Microscale and High Magnetic Field Laboratory of CAS, University of Science and Technology of China, Hefei, China
- Institute of Physical Science and Information Technology, Anhui University, Hefei, China
| | - J M Rondinelli
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, USA
| | - R D Averitt
- Department of Physics, University of California San Diego, La Jolla, CA, USA
| | - D N Basov
- Department of Physics, Columbia University, New York, NY, USA
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Rao TW, Shen YH, Zhao XG, Jiang SY. Effect of oxygen supplement during targeted temperature management on acute lung injury in the early stage of traumatic hemorrhagic shock. EUR J INFLAMM 2020. [DOI: 10.1177/2058739220930448] [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] [Indexed: 11/15/2022] Open
Abstract
Ideal concentrations of inhaled oxygen with regard to lung protection during early traumatic hemorrhagic shock (THS) remain unknown especially in the era of targeted temperature management (TTM). We speculated that a significant increase in oxygen supply in early stage of THS would magnify the protecting role of hypothermia in acute lung injury. Forty male New Zealand rabbits were randomly divided into four groups (n = 10): sham group, control group, group 1, and group 2. Except for sham group, all other animals were submitted to 30 min of uncontrolled THS and received limited fluid resuscitation for 60 min. During resuscitation, in addition to 34°C of TTM, animals in group 1 inhaled 21% oxygen while animals in group 2 inhaled 50% oxygen. Animals in control group inhaled room air and were kept normothermia. Oxidative stress, inflammation, and apoptosis parameters in the lung tissues were determined. THS induced higher expression of malondialdehyde, surfactant protein A, nuclear factor kappa B, and caspase 3 as well as lower expression of Bcl-2 mRNA and superoxide dismutase activity. Compared with inhalation of 21% oxygen, inhalation of 50% oxygen during TTM significantly improves oxidative stress, inflammation, apoptosis, and acute lung injury. Oxygen supplement during TTM therapy alleviated acute lung injury in the early stage of THS. Further studies are required to explore the ideal combination forms of TTM and oxygen supplement with the purpose of maximizing therapeutic effect while minimizing adverse effects.
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Affiliation(s)
- Tai-Wen Rao
- Department of Emergency Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Research Institute of Emergency Medicine, Zhejiang University, Hangzhou, China
| | - Ye-Hua Shen
- Department of Radiology, The Children’s Hospital, Zhejiang University School of Medicine, Hangzhou, China
- National Clinical Research Center for Child Health, Hangzhou, China
| | - Xiao-Gang Zhao
- Department of Emergency Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Research Institute of Emergency Medicine, Zhejiang University, Hangzhou, China
| | - Shou-Yin Jiang
- Department of Emergency Medicine, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
- Research Institute of Emergency Medicine, Zhejiang University, Hangzhou, China
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Liu Y, Zou ZQ, Xiao J, Zhang M, Yuan L, Zhao XG. A nomogram prediction model for recurrent laryngeal nerve lymph node metastasis in thoracic oesophageal squamous cell carcinoma. J Thorac Dis 2019; 11:2868-2877. [PMID: 31463116 DOI: 10.21037/jtd.2019.06.46] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 12/21/2022]
Abstract
Background The metastasis rate to the recurrent laryngeal nerve lymph node (RLN LN) is high, but resection of it is challenging and increases complications. This study explored the risk factors for the RLN LN metastasis in thoracic oesophageal squamous cell carcinoma and developed a novel scoring system to predict it. Methods We retrospectively analysed the clinicopathological data of 265 patients between 2015 and 2018. Univariate and multivariate analyses were performed to screen for risk factors and establish a logistic regression model to predict the risk of RLN LN metastasis. A nomogram was constructed accordingly. Further analyses were conducted regarding right and left RLN LN metastasis alone. Results (I) The metastatic rates of the left and right RLN LN were 15.1% and 20.4%, respectively. (II) Multivariate logistic regression analysis showed that the short axis diameter of the left RLN LN, short axis diameter of the right RLN LN, maximum diameter of the tumor, tumor location, subcarinal lymph node status and paraoesophageal lymph node status were all independent risk factors for RLN LN metastasis. (III) Multivariate logistic regression analysis showed that the short axis diameter of right RLN LN, tumor location and subcarinal lymph node status were independent risk factors for right RLN LN metastasis. (IV) Multivariate logistic regression analysis showed that short axis diameter of left RLN LN was an independent risk factor for left RLN LN metastasis. Conclusions The metastatic rates of the left and right RLN LNs were high and can be predicted according to these nomograms.
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Affiliation(s)
- Yu Liu
- Department of Thoracic Surgery, the Second Hospital of Shandong University, Jinan 250033, China.,Department of Thoracic Surgery, the 960th Hospital of People's Liberation Army of China, Jinan 250000, China
| | - Zhi-Qiang Zou
- Department of Thoracic Surgery, the 960th Hospital of People's Liberation Army of China, Jinan 250000, China
| | - Juan Xiao
- Center of Evidence-Based Medicine, Institute of Medical Sciences, the Second Hospital of Shandong University, Jinan 250033, China
| | - Mei Zhang
- Department of Thoracic Surgery, the 960th Hospital of People's Liberation Army of China, Jinan 250000, China
| | - Lei Yuan
- Department of Thoracic Surgery, the 960th Hospital of People's Liberation Army of China, Jinan 250000, China
| | - Xiao-Gang Zhao
- Department of Thoracic Surgery, the Second Hospital of Shandong University, Jinan 250033, China
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Wan TJ, Yu YC, Zhao XG, Tang P, Gong YS. Efficacy of betahistine plus cognitive behavioral therapy on residual dizziness after successful canalith repositioning procedure for benign paroxysmal positional vertigo. Neuropsychiatr Dis Treat 2018; 14:2965-2971. [PMID: 30464481 PMCID: PMC6223332 DOI: 10.2147/ndt.s182809] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Some patients still complain of residual dizziness after successful canalith repositioning procedure (CRP) for benign paroxysmal positional vertigo (BPPV). Previous study found that compared to the low-dose betahistine, the high-dose betahistine could yield better efficacy in treating residual dizziness. Therefore, this study was conducted to assess whether the addition of cognitive behavioral therapy (CBT) could make low-dose betahistine produce similar results to high-dose betahistine in treating residual dizziness. METHODS The recruited patients were randomly assigned to receive either low-dose betahistine (6 mg/time, three times/day) or high-dose betahistine (12 mg/time, three times/day). Patients in the low-dose group also received CBT (twice a week, 1 hour per time). The treatment was continued for 4 weeks. The duration of residual dizziness, 25-item Dizziness Handicap Inventory (DHI), Hamilton Anxiety Rating Scale (HARS), and Hamilton Depression Rating Scale (HDRS) were recorded and analyzed. The duration of residual dizziness and DHI score were the primary outcomes, and the HARS and HDRS scores were the secondary outcomes. RESULTS Each group had 50 patients. After treatment, the average DHI scores, HDRS scores, and HARS scores were significantly decreased in both groups. The duration of residual dizziness and average DHI score were nonsignificantly different (P=0.08; P=0.06) between the two groups, although they were lower in the low-dose group. Compared to the high-dose group, the low-dose group had the significantly lower average HDRS score (P=0.007) and HARS score (P=0.02). Meanwhile, four patients in the high-dose group experienced intolerable stomach upset. CONCLUSION These results demonstrated that the addition of CBT could make low-dose beta-histine produce similar results to high-dose betahistine in treating residual dizziness. Moreover, the low-dose betahistine plus CBT showed some advantages over high-dose betahistine in relieving depressive and anxiety symptoms and should be further explored.
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Affiliation(s)
- Tian-Ju Wan
- Department of Emergency, Yongchuan Hospital of Chongqing Medical University, Chongqing, China
| | - Yi-Chuan Yu
- Department of Emergency, Yongchuan Hospital of Chongqing Medical University, Chongqing, China
| | - Xiao-Gang Zhao
- Department of Emergency, Yongchuan Hospital of Chongqing Medical University, Chongqing, China
| | - Ping Tang
- Department of Emergency, Yongchuan Hospital of Chongqing Medical University, Chongqing, China
| | - Yong-Shu Gong
- Department of Pediatrics, Yongchuan Hospital of Chongqing Medical University, Chongqing, China,
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Zhang WQ, Zhao SK, Luo JW, Dong XP, Hao YT, Li H, Shan L, Zhou Y, Shi HB, Zhang ZY, Peng CL, Zhao XG. Alterations of fecal bacterial communities in patients with lung cancer. Am J Transl Res 2018; 10:3171-3185. [PMID: 30416659 PMCID: PMC6220220] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 09/07/2018] [Indexed: 06/09/2023]
Abstract
Emerging evidence suggests the microbiome may affect a number of diseases, including lung cancer. However, the direct relationship between gut bacteria and lung cancer remains uncharacterized. In this study, we directly sequenced the hypervariable V1-V2 regions of the 16S rRNA gene in fecal samples from patients with lung cancer and healthy volunteers. Unweighted principal coordinate analysis (PCoA) revealed a clear difference in the bacterial community membership between the lung cancer group and the healthy control group. The lung cancer group had remarkably higher levels of Bacteroidetes, Fusobacteria, Cyanobacteria, Spirochaetes, and Lentisphaerae but dramatically lower levels of Firmicutes and Verrucomicrobia than the healthy control group (P < 0.05). Despite significant interindividual variation, eight predominant genera were significantly different between the two groups. The lung cancer group had higher levels of Bacteroides, Veillonella, and Fusobacterium but lower levels of Escherichia-Shigella, Kluyvera, Fecalibacterium, Enterobacter, and Dialister than the healthy control group (P < 0.05). Most notably, correlations between certain specific bacteria and serum inflammatory biomarkers were identified. Our findings demonstrated an altered bacterial community in patients with lung cancer, providing a significant step in understanding the relationship between gut bacteria and lung cancer. To our knowledge, this is the first study to evaluate the correlations between certain specific bacteria and inflammatory indicators. To better understand this relationship, further studies should investigate the underlying mechanisms of gut bacteria in lung cancer animal models.
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Affiliation(s)
- Wei-Quan Zhang
- Department of Thoracic Surgery, The Second Hospital of Shandong UniversityShandong, P. R. China
- School of Medicine, Shandong UniversityJinan 250000, Shandong, P. R. China
| | - Shu-Kang Zhao
- Department of Thoracic Surgery, The Second Hospital of Shandong UniversityShandong, P. R. China
- School of Medicine, Shandong UniversityJinan 250000, Shandong, P. R. China
| | - Jun-Wen Luo
- Department of Thoracic Surgery, The Second Hospital of Shandong UniversityShandong, P. R. China
- School of Medicine, Shandong UniversityJinan 250000, Shandong, P. R. China
| | - Xiao-Peng Dong
- Department of Thoracic Surgery, The Second Hospital of Shandong UniversityShandong, P. R. China
| | - Ying-Tao Hao
- Department of Thoracic Surgery, The Second Hospital of Shandong UniversityShandong, P. R. China
| | - Hui Li
- Department of Pathology, The Second Hospital of Shandong UniversityShandong, P. R. China
| | - Lei Shan
- Department of Thoracic Surgery, The Second Hospital of Shandong UniversityShandong, P. R. China
| | - Yong Zhou
- Cancer Center, The Second Hospital of Shandong UniversityShandong, P. R. China
| | - Hu-Bo Shi
- Department of Thoracic Surgery, Shandong Provincial Chest HospitalJinan 250000, Shandong, P. R. China
| | - Zai-Yun Zhang
- Cancer Center, The Second Hospital of Shandong UniversityShandong, P. R. China
| | - Chuan-Liang Peng
- Department of Thoracic Surgery, The Second Hospital of Shandong UniversityShandong, P. R. China
| | - Xiao-Gang Zhao
- Department of Thoracic Surgery, The Second Hospital of Shandong UniversityShandong, P. R. China
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Zhao G, Wang H, Hu DM, Ding MC, Zhao XG, Yan JL. Anomalous phase behavior of first-order fluid-liquid phase transition in phosphorus. J Chem Phys 2018; 147:204501. [PMID: 29195280 DOI: 10.1063/1.4999009] [Citation(s) in RCA: 4] [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: 12/23/2022] Open
Abstract
Although the existence of liquid-liquid phase transition has become more and more convincing, whether it will terminate at a critical point and what is the order parameter are still open. To explore these questions, we revisit the fluid-liquid phase transition (FLPT) in phosphorus (P) and study its phase behavior by performing extensive first-principles molecular dynamics simulations. The FLPT observed in experiments is well reproduced, and a fluid-liquid critical point (FLCP) at T = 3000 ∼ 3500 K, P = 1.5-2.0 Kbar is found. With decreasing temperature from the FLCP along the transition line, the density difference (Δρ) between two coexisting phases first increases from zero and then anomalously decreases; however, the entropy difference (ΔS) continuously increases from zero. These features suggest that an order parameter containing contributions from both the density and the entropy is needed to describe the FLPT in P, and at least at low temperatures, the entropy, instead of the density, governs the FLPT.
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Affiliation(s)
- G Zhao
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - H Wang
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - D M Hu
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - M C Ding
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - X G Zhao
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
| | - J L Yan
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, People's Republic of China
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11
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Zhang LY, Zhang XZ, Bai XJ, Zhang M, Zhao XG, Xu YA, Tan H, Li Y. Current trauma care system and trauma care training in China. Chin J Traumatol 2018; 21:73-76. [PMID: 29395429 PMCID: PMC5911734 DOI: 10.1016/j.cjtee.2017.07.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 07/20/2017] [Accepted: 07/21/2017] [Indexed: 02/04/2023] Open
Abstract
Trauma is a life-threatening "modern disease". The outcomes could only be optimized by cost-efficient and prompt trauma care, which embarks on the improvement of essential capacities and conceptual revolution in addition to the disruptive innovation of the trauma care system. According to experiences from the developed countries, systematic trauma care training is the cornerstone of the generalization and the improvement on the trauma care, such as the Advance Trauma Life Support (ATLS). Currently, the pre-hospital emergency medical services (EMS) has been one of the essential elements of infrastructure of health services in China, which is also fundamental to the trauma care system. Hereby, the China Trauma Care Training (CTCT) with independent intellectual property rights has been initiated and launched by the Chinese Trauma Surgeon Association to extend the up-to-date concepts and techniques in the field of trauma care as well to reinforce the generally well-accepted standardized protocols in the practices. This article reviews the current status of the trauma care system as well as the trauma care training.
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Affiliation(s)
- Lian-Yang Zhang
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute of Surgery, Daping Hospital, Amry Medical University, Chongqing, 400042, China.
| | - Xiu-Zhu Zhang
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute of Surgery, Daping Hospital, Amry Medical University, Chongqing, 400042, China
| | - Xiang-Jun Bai
- Department of Traumatic Surgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Mao Zhang
- Department of Emergency Medicine, The Second Affiliated Hospital of Medical College, Zhejiang University, Zhejiang, 310009, China
| | - Xiao-Gang Zhao
- Department of Emergency Medicine, The Second Affiliated Hospital of Medical College, Zhejiang University, Zhejiang, 310009, China
| | - Yong-An Xu
- Department of Emergency Medicine, The Second Affiliated Hospital of Medical College, Zhejiang University, Zhejiang, 310009, China
| | - Hao Tan
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute of Surgery, Daping Hospital, Amry Medical University, Chongqing, 400042, China
| | - Yang Li
- Trauma Center, State Key Laboratory of Trauma, Burns and Combined Injury, Research Institute of Surgery, Daping Hospital, Amry Medical University, Chongqing, 400042, China
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Zhao LY, Tong DD, Xue M, Ma HL, Liu SY, Yang J, Liu YX, Guo B, Ni L, Liu LY, Qin YN, Wang LM, Zhao XG, Huang C. MeCP2, a target of miR-638, facilitates gastric cancer cell proliferation through activation of the MEK1/2-ERK1/2 signaling pathway by upregulating GIT1. Oncogenesis 2017; 6:e368. [PMID: 28759023 PMCID: PMC5541712 DOI: 10.1038/oncsis.2017.60] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2016] [Revised: 05/02/2017] [Accepted: 06/07/2017] [Indexed: 02/08/2023] Open
Abstract
Methyl-CpG binding protein 2 (MeCP2) is involved in the carcinogenesis and progression of multiple types of cancer. However, its precise role in gastric cancer (GC) and the relevant molecular mechanism remain unknown. In the present study, we found that miR-638 levels were lower in GC tissues and GC cell lines than in adjacent normal tissues and normal gastric epithelial cell lines, respectively. Low miR-638 levels were associated with poor tumor differentiation, tumor size and lymph node metastasis. MeCP2 expression levels were higher in GC tissues than in adjacent normal tissues. It was found that miR-638 inhibited GC cell proliferation, colony formation, G1–S transition and tumor growth, and induced cell apoptosis by directly targeting MeCP2. MeCP2 promoted GC cell proliferation, colony formation and G1–S cell-cycle transition, and suppressed apoptosis. Molecular mechanistic investigations were performed using an integrated approach with a combination of microarray analysis, chromatin immunoprecipitation sequencing and a reporter gene assay. The results showed that MeCP2 bound to the methylated CpG islands of G-protein-coupled receptor kinase-interacting protein 1 (GIT1) promoter and upregulated its expression, thereby activating the MEK1/2–ERK1/2 signaling pathway and promoting GC cell proliferation. Taken together, our study demonstrates that MeCP2, a target of miR-638, facilitates GC cell proliferation and induces cell-cycle progression through activation of the MEK1/2–ERK1/2 signaling pathway by upregulating GIT1. The findings suggest that MeCP2 plays a significant role in GC progression, and may serve as a potential target for GC therapy.
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Affiliation(s)
- L Y Zhao
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - D D Tong
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - M Xue
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - H L Ma
- Department of Radiation Oncology, The First Affiliated Hospital of Medical College, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - S Y Liu
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - J Yang
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - Y X Liu
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - B Guo
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - L Ni
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - L Y Liu
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - Y N Qin
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - L M Wang
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - X G Zhao
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China
| | - C Huang
- Department of Cell Biology and Genetics/Key Laboratory of Environment and Genes Related to Diseases, School of Basic Medical Sciences, Xi'an Jiaotong University Health Science Center, Xi'an, Shaanxi, China.,Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, China.,Medical College of Yan'an University, Yan'an, Shaanxi, China
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Dai ZM, Liu W, Zhao XT, Wang TT, Li SK, Yu Y, Zhao XG, Zhang ZD. Magnetization reversal and magnetic interactions in anisotropic Nd-Dy-Fe-Co-B/MgO/α-Fe disks and multilayers. Nanoscale 2017; 9:7385-7390. [PMID: 28541364 DOI: 10.1039/c7nr01421j] [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] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report on a field induced domain evolutionary procedure in the anisotropic Nd-Dy-Fe-Co-B/MgO/Fe multilayers by using first-order-reversal-curves and magnetic force microscopy. Different reversal behaviors and domain sizes are found in well coupled and decoupled multilayers by changing the thickness of the spacer layer. The competition between dipolar magnetostatic energy and Zeeman energy is evaluated by in-field observation throughout nucleation and annihilation processes. In addition, lithography-patterned arrays of soft Fe disks onto a continuous Nd-Dy-Fe-Co-B hard-magnetic layer are designed. By decreasing the applied field, it is found that magnetization orientations of the Fe disk and Nd-Dy-Fe-Co-B layer are aligned parallel. In the decoupled disk, although the out-of-plane magnetization orientations are observed, the orientation of the domains in the Fe disk is random. Furthermore, it is found that a stronger anisotropy of the Nd-Dy-Fe-Co-B layer decreases the interaction length. Our results provide a new understanding of anisotropic nanocomposite magnets with long-ranged magnetic interactions.
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Affiliation(s)
- Z M Dai
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
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Zhao XG, Liu P, Song YC, Zhang AP, Chen XM, Zhou JP. Retraction: Origin of colossal permittivity in (In1/2Nb1/2)TiO2via broadband dielectric spectroscopy. Phys Chem Chem Phys 2016; 18:26310. [PMID: 27604689 DOI: 10.1039/c6cp90224c] [Citation(s) in RCA: 2] [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]
Abstract
Retraction of 'Origin of colossal permittivity in (In1/2Nb1/2)TiO2via broadband dielectric spectroscopy' by Xiao-gang Zhao et al., Phys. Chem. Chem. Phys., 2015, 17, 23132-23139.
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Affiliation(s)
- Xiao-Gang Zhao
- College of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062, China.
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Jiang SY, Shen YH, Zhao XG. Adrenaline use is associated with excess organ injury and mortality in cardiogenic shock: facts and fiction. Crit Care 2016; 20:292. [PMID: 27677447 PMCID: PMC5039829 DOI: 10.1186/s13054-016-1460-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- Shou-Yin Jiang
- Department of Emergency Medicine, Second Affiliated Hospital, Zhejiang University School of Medicine; Research Institute of Emergency Medicine, Zhejiang University, 88 Jiefang Road, Hangzhou, 310009, China
| | - Ye-Hua Shen
- Department of Radiology, The Children's Hospital, Zhejiang University School of Medicine, Hangzhou, 310009, China
| | - Xiao-Gang Zhao
- Department of Emergency Medicine, Second Affiliated Hospital, Zhejiang University School of Medicine; Research Institute of Emergency Medicine, Zhejiang University, 88 Jiefang Road, Hangzhou, 310009, China.
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Tang M, Zhao XG, He Y, Gu JY, Mei J. Aggressive re-warming at 38.5 °C following deep hypothermia at 21 °C increases neutrophil membrane bound elastase activity and pro-inflammatory factor release. Springerplus 2016; 5:495. [PMID: 27186459 PMCID: PMC4839026 DOI: 10.1186/s40064-016-2084-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 03/31/2016] [Indexed: 11/10/2022]
Abstract
Background Cardiopulmonary bypass (CPB) is often performed under hypothermic condition. The effects of hypothermia and re-warming on neutrophil activity are unclear. This study aimed to compare the effects of different hypothermia and re-warming regimens on neutrophil membrane bound elastase (MBE) activity and the release of pro-inflammatory factors from neutrophils. Methods Human neutrophils were exposed to different hypothermia and re-warming regimens. MBE activity and the release of interleukin (IL)-β1, IL-6, IL-8, and tumor necrosis factor (TNF)-α were measured. Results Neutrophil MBE activity was significantly reduced after 60-min moderate (28 °C) or deep (21 °C) hypothermic treatment. Compared with normothermic (37 °C) re-warming, aggressive re-warming (38.5°) for 120 min following deep hypothermia (21 °C) dramatically increased neutrophil MBE activity (P < 0.05). Co-incubation of neutrophils with platelet-rich plasma further increased MBE activity significantly under all the tested temperature regimens. IL-β1 release from neutrophils was significantly higher after deep hypothermia (21 °C) followed by normothermic (37 °C) re-warming than after moderate hypothermia (28 °C) followed by normothermic re-warming (P < 0.05). Aggressive re-warming (38.5°) following deep hypothermia significantly increased the release of IL-β1, IL-8, and TNF-α from neutrophil compared with moderate re-warming (37 °C) (all P < 0.05). Conclusion Aggressive re-warming following deep hypothermia may contribute to CPB-associated tissue injury by increasing neutrophil MBE activity and stimulating pro-inflammatory factor release, thus, should be avoided. The optimal hypothermic temperature of CPB should be determined based on patient clinical characteristics and surgery type.
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Affiliation(s)
- Min Tang
- Department of Cardiothoracic Surgery, Shanghai Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Xiao-Gang Zhao
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital Affiliated to Tongji University, Shanghai, China
| | - Yi He
- Department of Cardiothoracic Surgery, Shanghai Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - John Yan Gu
- Department of Biomedical Engineering, University Medical Centre Groningen, Groningen, The Netherlands
| | - Ju Mei
- Department of Cardiothoracic Surgery, Shanghai Xinhua Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai, China
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17
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Zhao XG. Emergency management of hemodynamically unstable pelvic fractures. Chin J Traumatol 2016; 14:363-6. [PMID: 22152141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Pelvic fractures are serious injuries. Death within 24 hours is most often a result of acute blood loss. The emergency management of these patients is challenging and controversial. The key issues in its management are identifying the site(s) of hemorrhage and then controlling the bleeding. Management of hemodynamically unstable patients with pelvic fracture requires a multidisci- plinary team. The issues addressed in this management algorithm are diagnostic evaluation, damage control resuscitation, indications for noninvasive pelvic stabilization, preperitoneal pelvic packing and the critical decisions concerning surgical options and angiography. This review article focuses on the recent body of know- ledge on those determinations.
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Affiliation(s)
- Xiao-Gang Zhao
- Department of Emergency Medicine, Second Affiliated Hospital, Medical School of Zhejiang University, Hangzhou 310009, China
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18
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Jiang N, Dong XP, Zhang SL, You QY, Jiang XT, Zhao XG. Triptolide reverses the Taxol resistance of lung adenocarcinoma by inhibiting the NF-κB signaling pathway and the expression of NF-κB-regulated drug-resistant genes. Mol Med Rep 2015; 13:153-9. [PMID: 26531258 PMCID: PMC4686042 DOI: 10.3892/mmr.2015.4493] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 09/24/2015] [Indexed: 12/26/2022] Open
Abstract
Paclitaxel (or Taxol®) is a first-line chemotherapeutic drug for the treatment of non-small cell lung cancer; however, resistance to the drug is an important factor, which influences the outcome of chemotherapy. The present study aimed to investigate the role of triptolide (TPL) in reversing Taxol‑resistant human lung adenocarcinoma and to elucidate the underlying molecular mechanism of resistance reversal mediated by TPL. It was hypothesized that this experimental approach would assist in solving the problem of chemotherapeutic resistance in non‑small cell lung cancer, thereby improving the clinical outcomes. The human Taxol‑resistant lung adenocarcinoma cell line, A549/Taxol, was established. The resistance index of the cell line was calculated, according to the half maximal inhibitory concentration (IC50) of A549/Taxol IC50 of A549, to be 51.87. The levels of apoptosis and the cell cycle in the A549/Taxol cell line were assessed to confirm the effects of TPL at three different concentrations (0.03, 0.3 and 3 µmol/l) and treatment durations (2, 4, 6 and 12 h) by flow cytometric analysis, and the inhibition of the NF‑κB signaling pathway and the expression of NF‑κB‑regulated drug‑resistant proteins were determined by immunofluorescence and western blotting, respectively. The administration of TPL promoted cell apoptosis in the A549/Taxol lung adenocarcinoma Taxol‑resistant cell line and also promoted cell cycle regulation. The drug was also able to elicit a reversal of the drug resistance. TPL inhibited the nuclear factor‑κB (NF‑κB) signaling pathway and the expression of NF‑κB‑regulated drug‑resistant genes, including those for FLICE‑like inhibitory protein, X‑linked inhibitor of apoptosis protein, Bcl‑2, Bcl‑xL and cyclo‑oxygenase‑2. TPL exerted a marked drug‑resistance‑reversal effect on human lung adenocarcinoma Taxol resistance, and the effect was revealed to be dose‑ and time‑dependent. In conclusion, TPL exerted its role in the process of resistance reversal by inhibiting the NF‑κB signaling pathway, and the transcription and expression of NF-κB-regulated drug-resistant genes.
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Affiliation(s)
- Ning Jiang
- Department of Thoracic Surgery, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Xiao-Peng Dong
- Department of Thoracic Surgery, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Suo-Lin Zhang
- Department of Thoracic Surgery, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Qing-Yong You
- Department of Thoracic Surgery, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Xing-Tao Jiang
- Department of Thoracic Surgery, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
| | - Xiao-Gang Zhao
- Department of Thoracic Surgery, The Second Hospital of Shandong University, Jinan, Shandong 250033, P.R. China
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Cong WT, Tang Z, Zhao XG, Chu JH. Enhanced magnetic anisotropies of single transition-metal adatoms on a defective MoS2 monolayer. Sci Rep 2015; 5:9361. [PMID: 25797135 PMCID: PMC4369737 DOI: 10.1038/srep09361] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 03/02/2015] [Indexed: 11/10/2022] Open
Abstract
Single magnetic atoms absorbed on an atomically thin layer represent the ultimate limit of bit miniaturization for data storage. To approach the limit, a critical step is to find an appropriate material system with high chemical stability and large magnetic anisotropic energy. Here, on the basis of first-principles calculations and the spin-orbit coupling theory, it is elucidated that the transition-metal Mn and Fe atoms absorbed on disulfur vacancies of MoS2 monolayers are very promising candidates. It is analysed that these absorption systems are of not only high chemical stabilities but also much enhanced magnetic anisotropies and particularly the easy magnetization axis is changed from the in-plane one for Mn to the out-of-plane one for Fe by a symmetry-lowering Jahn-Teller distortion. The results point out a promising direction to achieve the ultimate goal of single adatomic magnets with utilizing the defective atomically thin layers.
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Affiliation(s)
- W T Cong
- Key Laboratory of Polar Materials and Devices, Ministry of Education of China, East China Normal University, Shanghai 200241, People's Republic of China
| | - Z Tang
- Key Laboratory of Polar Materials and Devices, Ministry of Education of China, East China Normal University, Shanghai 200241, People's Republic of China
| | - X G Zhao
- Key Laboratory of Polar Materials and Devices, Ministry of Education of China, East China Normal University, Shanghai 200241, People's Republic of China
| | - J H Chu
- Key Laboratory of Polar Materials and Devices, Ministry of Education of China, East China Normal University, Shanghai 200241, People's Republic of China
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Peng CL, Zhang Y, Sun QF, Zhao YP, Hao YT, Zhao XG, Cong B. Inhibitory effects of syk transfection on lung cancer cell invasion. Asian Pac J Cancer Prev 2014; 14:3001-3. [PMID: 23803069 DOI: 10.7314/apjcp.2013.14.5.3001] [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: 11/10/2022] Open
Abstract
OBJECTIVE Spleen tyrosine kinase (Syk) is closely related to tumor invasion and metastasis, and has been shown to have potential inhibitory effects in tumors. In this study, we constructed a eukaryotic expression vector for Syk and analyzed its effects on invasive ability of the A549 non-small cell lung cancer cell line in vitro. METHODS A fragment of Syk was obtained by RT-PCR from human lung cancer cells and cloned into the expression vector pLNCXSyk. After restriction endonuclease digestion, PCR and DNA sequencing confirmation, the recombinant Syk expression plasmid was transfected into A549 human lung cancer cells using lipofectamine protocols. After selection, the cells stably expressed Syk. Detection of Syk expression of the cells by RT-PCR, and invasive ability were examined. RESULTS The eukaryotic expression plamid pLNCXSyk was constructed and expressed stably in the A549 human lung cancer cells. The RT-PCR results showed that Syk mRNA expression was upregulated significantly (P<0.05). Lower invasion through a basal membrane were apparent after transfection (P<0.05). CONCLUSIONS A eukaryotic expression plasmid to cause Syk expression in lung cancer cells can obviously inhibit their invasive ability in vitro.
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Affiliation(s)
- Chuan-Liang Peng
- Department of Thoracic, The Second Hospital of Shandong University, Jinan, China.
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Dong XP, Xiao TH, Dong H, Jiang N, Zhao XG. Endostar combined with cisplatin inhibits tumor growth and lymphatic metastasis of lewis lung carcinoma xenografts in mice. Asian Pac J Cancer Prev 2014; 14:3079-83. [PMID: 23803083 DOI: 10.7314/apjcp.2013.14.5.3079] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE To investigate the effects of endostar, a recombined humanized endostatin, plus cisplatin on the growth, lymphangiogenesis and lymphatic metastasis of the Lewis lung carcinoma (LLC) in mice. METHODS A tumor model were established in C57BL/6 mice by intravenious transplantation of LLC cells. Then the mice were randomized to receive administration with NS, endostar, cisplatin, or endostar plus cisplatin. After the mice were sacrificed, tumor multiplicity, tumor size and lymph node metastasis were assessed. Then the expression of vascular endothelial growth factor-c (VEGF-C) and podoplanin were determined by immunohistochemical staining. RESULTS Endostar plus cisplatin significantly suppressed tumor growth. lymphatic metastasis and prolonged survival time of the mice without obvious toxicity. The inhibition of lymphatic metastasis was associated with decreased microlymphatic vessel density (MLVD) and expression of VEGF-C. CONCLUSIONS Endostar combined with cisplatin was more effective to suppress tumor growth and lymphatic metastasis than either agent alone. Thus this may provide a rational alternative for lung carcinoma treatment.
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Affiliation(s)
- Xiao-Peng Dong
- Department of Thoracic Surgery, Second Hospital of Shandong University, Shandong University, Jinan, China.
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22
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Zhao LY, Zhang J, Guo B, Yang J, Han J, Zhao XG, Wang XF, Liu LY, Li ZF, Song TS, Huang C. MECP2 promotes cell proliferation by activating ERK1/2 and inhibiting p38 activity in human hepatocellular carcinoma HEPG2 cells. Cell Mol Biol (Noisy-le-grand) 2013; Suppl 59:OL1876-OL1881. [PMID: 24199952] [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] [Received: 09/25/2013] [Accepted: 10/16/2013] [Indexed: 06/02/2023]
Abstract
Hepatocellular carcinoma (HCC) is the third leading cause of cancer-related death worldwide and currently represents the leading cause of death amongst cirrhotic patients, but the mechanisms remain unknown. In this experiment, we investigated the expression of Methyl CpG-binding protein 2 (MeCP2) in HCC, the effect of MeCP2 on the proliferation of human HCC HepG2 cells, and the activation of mitogen-activated protein kinases (MAPKs) signaling pathways. The results showed that MeCP2 expression levels was higher in human HCC tissue than normal hepatocellular tissue, and MeCP2 siRNA reduced the proliferation of HCC HepG2 cells by decreasing cell activity and cell division in vitro. After MeCP2 siRNA treatment, the proportion of G1/G0 phase cells increased, but the proportion of S and G2/M phase cells decreased, indicative of G1/G0 cell cycle arrest. Furthermore, the proportions of early and late apoptosis in HCC HepG2 cells were enhanced after MeCP2 siRNA treatment. It was also found that activation of extracellular signal-regulated protein kinase (ERK) and p38 signaling pathways were involved in the proliferation of HepG2 cells. After MeCP2 siRNA treatment, p-ERK1/2 levels decreased, but p-p38 levels increased. Our findings demonstrated that MeCP2 promoted the proliferation of human HCC HepG2 cells with activation of ERK1/2 signaling pathways, suggesting a novel mechanism for pharmacological study of treatment for human HCC.
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Affiliation(s)
- L Y Zhao
- Xi'an Jiaotong University College of Medicine Department of Genetics and Molecular Biology, Environment and Genes Related to Diseases Key Laboratory of Education Ministry Shaanxi China
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urRehman S, Song G, Jia H, Zhou H, Zhao X, Dang G, Chen C. Synthesis and characterization of benzimidazole-based low CTE block copolyimides. J Appl Polym Sci 2013. [DOI: 10.1002/app.38969] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
MOTIVATION The area under the receiver operating characteristic (ROC) curve (AUC), long regarded as a 'golden' measure for the predictiveness of a continuous score, has propelled the need to develop AUC-based predictors. However, the AUC-based ensemble methods are rather scant, largely due to the fact that the associated objective function is neither continuous nor concave. Indeed, there is no reliable numerical algorithm identifying optimal combination of a set of biomarkers to maximize the AUC, especially when the number of biomarkers is large. RESULTS We have proposed a novel AUC-based statistical ensemble methods for combining multiple biomarkers to differentiate a binary response of interest. Specifically, we propose to replace the non-continuous and non-convex AUC objective function by a convex surrogate loss function, whose minimizer can be efficiently identified. With the established framework, the lasso and other regularization techniques enable feature selections. Extensive simulations have demonstrated the superiority of the new methods to the existing methods. The proposal has been applied to a gene expression dataset to construct gene expression scores to differentiate elderly women with low bone mineral density (BMD) and those with normal BMD. The AUCs of the resulting scores in the independent test dataset has been satisfactory. CONCLUSION Aiming for directly maximizing AUC, the proposed AUC-based ensemble method provides an efficient means of generating a stable combination of multiple biomarkers, which is especially useful under the high-dimensional settings. CONTACT lutian@stanford.edu. SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- X G Zhao
- Department of Bone and Joint Surgery, The First Affiliated Hospital of Xi'an Medical University, Xi'an 710077, Shaanxi Province, PR China
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Tang M, Zhao XG, Gu YJ, Chen CZ. An in vitro model for studying neutrophil activation during cardiopulmonary bypass by using a polymerase chain reaction thermocycler. Altern Lab Anim 2010; 38:213-9. [PMID: 20602537 DOI: 10.1177/026119291003800307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The accurate temperature control of a polymerase chain reaction (PCR) thermocycler was exploited in developing an in vitro model to study neutrophil activation during cardiopulmonary bypass. Neutrophils from 12 volunteers underwent temperature changes in a PCR thermocycler (37 degrees C for 30 minutes, 28 degrees C for 60 minutes, and then 37 degrees C for 90 minutes). Different co-incubates were applied to neutrophils, as follows: Group A: phosphate-buffered saline solution; Group B: platelet activating factor (PAF) ; Group C: platelet-depleted plasma; Group D: platelet-depleted plasma + PAF; and Group E: platelet-rich plasma. Membrane-bound elastase (MBE) activity was measured every 30 minutes throughout the experiment. MBE activity decreased significantly after hypothermia, compared with the baseline level (p < 0.001), and it resumed an increase after re-warming. Among all co-incubates, platelet-rich plasma was the most potent pro-inflammatory stimulus to neutrophils. A linear correlation was found between MBE and platelet count in platelet-rich plasma (p = 0.004). A novel in vitro model involving a PCR thermocycler has been proved to be reliable in the study of neutrophil activation during cardiopulmonary bypass. The model could possibly be used as an alternative to animals in the development of new drugs to combat neutrophil damage to tissues and organs during cardiopulmonary bypass in cardiac surgery.
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Affiliation(s)
- Min Tang
- Department of Cardiothoracic Surgery, Renji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China
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Zhao XG, Hui ES, Chan KC, Cai KX, Guo H, Lai PT, Wu EX. Identifying rodent olfactory bulb structures with micro-DTI. Annu Int Conf IEEE Eng Med Biol Soc 2009; 2008:2028-31. [PMID: 19163092 DOI: 10.1109/iembs.2008.4649589] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Olfactory bulb (OB) is one of the most developed systems in rodent models with complex neuronal organization and anatomical structures. MR diffusion tensor imaging (DTI) is a non-invasive technique to probe tissue microstructures by examining the diffusion characteristics of water molecules. This paper presents how different OB layers can be identified and quantitatively characterized by micro-DTI using a specially constructed micro-imaging radio frequency (RF) coil. High spatial resolution and high signal to noise ratio (SNR) DTI images of ex vivo rat OBs were obtained. Distinct contrasts were observed between various olfactory bulb layers in trace map, fractional anisotropy (FA) map and FA color map, all in consistency with the known OB neuroanatomy. These experimental results demonstrate the utility of micro-DTI in investigation of complex OB organization.
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Affiliation(s)
- X G Zhao
- Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam, China.
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Zhao XG, Ma YF, Zhang M, Gan JX, Xu SW, Jiang GY. Comparison of the new injury severity score and the injury severity score in multiple trauma patients. Chin J Traumatol 2008; 11:368-71. [PMID: 19032853 DOI: 10.1016/s1008-1275(08)60074-7] [Citation(s) in RCA: 11] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
OBJECTIVE To assess whether these characteristics of less misclassification and greater area under receiver operator characteristic (ROC) curve of the new injury severity score (NISS) are better than the injury severity score (ISS) as applying it to our multiple trauma patients registered into the emergency intensive care unit (EICU). METHODS This was a retrospective review of registry data from 2 286 multiple trauma patients consecutively registered into the EICU from January 1,1997 to December 31, 2006 in the Second Affiliated Hospital, Medical School of Zhejiang University in China. Comparisons between ISS and NISS were made using misclassification rates, ROC curve analysis, and the H-L statistics by univariate and multivariate logistic progression model. RESULTS Among the 2 286 patients, 176 (7.7%) were excluded because of deaths on arrival or patients less than 16 years of age. The study population therefore comprised 2 110 patients. Mean EICU length of stay (LOS) was 7.8 days ?2.4 days. Compared with the blunt injury group, the penetrating injury group had a higher percentage of male, lower mean EICU LOS and age. The most frequently injured body regions were extremities and head/neck, followed by thorax, face and abdomen in the blunt injury group; whereas, thorax and abdomen were more frequently seen in the penetrating injury group. The minimum misclassification rate for NISS was slightly less than ISS in all groups (4.01% versus 4.49%). However, NISS had more tendency to misclassify in the penetrating injury group. This, we noted, was attributed mainly to a higher false-positive rate (21.04% versus 15.55% for ISS, t equal to 3.310, P less than 0.001), resulting in an overall misclassification rate of 23.57% for NISS versus 18.79% for ISS (t equal to 3.290, P less than 0.001). In the whole sample, NISS presented equivalent discrimination (area under ROC curve: NISS equal to 0.938 versus ISS equal to 0.943). The H-L statistics showed poorer calibration (48.64 versus 32.11, t equal to 3.305, P less than 0.001) in the penetrating injury group. CONCLUSIONS NISS should not replace ISS because they share similar accuracy and calibration in predicting multiple blunt trauma patients. NISS may be more sensitive but less specific than ISS in predicting mortality in certain penetrating injury patients.
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Affiliation(s)
- Xiao-Gang Zhao
- Department of Emergency Medicine, Second Affiliated Hospital, Medical School of Zhejiang University, Hangzhou 310009, China
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Zhao XG, Zheng Y, Liang JM, Chan QCC, Yang XF, Li G, Yang ES. In vivo tumor detection on rabbit with biopsy needle as MRE driver. Annu Int Conf IEEE Eng Med Biol Soc 2008; 2008:121-124. [PMID: 19162608 DOI: 10.1109/iembs.2008.4649105] [Citation(s) in RCA: 1] [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: 05/27/2023]
Abstract
Magnetic Resonance Elastography (MRE) is a phase contrast imaging technique to quantitatively measure the elasticity of tissues. Typically, the oscillating driver is placed on the surface of objects to generate shear waves. When it is applied to detect tumors in deep location, the depth penetration of the wave is limited by attenuation and the biopsy procedure has to be performed separately. In this study, we describe a method using biopsy needle as the MRE driver to produce shear waves in tissues. We made comparison between the MRE acquisitions obtained with biopsy needle and surface drivers. Because the well-defined propagation wave pattern reduces the error in wavelength calculation, the acquisitions of biopsy needle driver shows better homogeneity in stiffness map. We also performed the experiment with the biopsy needle for in vivo tumor detection in rabbits. This study demonstrates that the biopsy needle driver is more effective than the surface driver for accurately measuring the stiffness and location of the tumor.
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Affiliation(s)
- X G Zhao
- Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam, China.
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30
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Abstract
Magnetic Resonance Elastography (MRE) is a phase contrast imaging technique to quantitatively measure the elasticity of tissues. Typically, an oscillating driver is placed on the surface to generate the shear waves. The depth penetration of the wave is limited by attenuation and the biopsy procedure has to be done separately. In this study, we use a biopsy needle as the driver to detect the 15% porcine gel inclusion in a 10% porcine gel phantom which simulates a tumor in tissues. We also perform the experiment with the biopsy needle for in-vivo tumor detection in rabbits. It is shown that the biopsy needle driver can accurately measure the stiffness and location of the tumor.
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Affiliation(s)
- X G Zhao
- Department of Electrical and Electronic Engineering, The University of Hong Kong
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31
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Sun ZH, Tan ZL, Liu SM, Tayo GO, Lin B, Teng B, Tang SX, Wang WJ, Liao YP, Pan YF, Wang JR, Zhao XG, Hu Y. Effects of dietary methionine and lysine sources on nutrient digestion, nitrogen utilization, and duodenal amino acid flow in growing goats. J Anim Sci 2007; 85:3340-7. [PMID: 17709770 DOI: 10.2527/jas.2006-718] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
This study investigated the effects of supplementation of various sources of Met and Lys on nutrient digestion, N utilization, and duodenal AA flows in growing goats. Four 4-mo-old Liuyang Black wether goats were used in a 4 x 4 Latin square experiment and were assigned to 4 dietary treatments: (1) control, (2) control + lipid-coated Met-Zn chelate and Lys-Mn chelate (PML), (3) control + Met-Zn chelate and Lys-Mn chelate (CML), and (4) control + dl-Met, l-Lys-HCl, ZnSO(4).7H(2)O, and MnSO(4).H(2)O (FML). Compared with control, PML reduced (P < 0.05) ruminal NH(3) concentration, urinary N excretion, and plasma urea N concentration and increased (P < 0.05) the activity of ruminal endo-1,4-beta-d-glucanase and beta-glucosidase, the duodenal flow of N, N retention (g/d as well as % of absorbed N), the duodenal flows of Met, Lys, His, Val, and total essential AA, and plasma concentrations of Lys, Val, Phe, and total essential AA. Supplementing Zn-Met and Mn-Lys chelates had similar (P > 0.05) but lesser effects on these measures compared with PML, and the effects on most of the measures were not statistically significant (P > 0.05) when compared with control. Supplementing free-form Met and Lys had no effects compared with control (P > 0.05). The results indicate that lipid coating and chelating of AA provide a protection, and to a lesser extent by only chelating, of the AA from microbial degradation in the rumen and possibly has effects on rumen fermentation, which increases MP supply. This technology could improve productive performance and be of potential benefit to ruminant production if cost-effective products are developed.
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Affiliation(s)
- Z H Sun
- Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan 410125, China
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Zhao XG, Ma YF, Jiang GY, Gan JX, Huang XJ. Epidemiological characteristics of expressway traffic trauma in 2040 cases. Chin J Traumatol 2004; 7:308-11. [PMID: 15363226] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
OBJECTIVE To evaluate the epidemiologic characteristics of expressway traffic trauma in 2040 cases in Zhejiang Province. METHODS The data of 2040 cases of expressway traffic trauma taken from Zhejiang Provincial Expressway Traffic Bureau were analyzed with computer techniques. RESULTS A total of 2040 persons were injured in 7963 expressway traffic accidents in Zhejiang Province from January 1999 to December 2001. Among them, 435 persons died (mortality, 21.3%) and 1 605 were injured. The economic losses were over 170 million yuan RMB. The accidents caused by human factors accounted for 84.9% (vehicle drivers accounting for 79.2%), which mainly included improper measures (20.4%), steering failure (17.7%), insufficient longitudinal space (15.9%), over-speed drive (12.5%), fatigue drive (6.4%), loading violation (5.9%) and careless drive (6.3%). Mechanical troubles and other factors took up 15.1%. There existed obvious uneven distribution among various regions. Jiaxing and Shaoxing were the sections with high incidence of accidents. The accidents mostly happened at 12:00-18:00, but the causing-dead ones most concentrated at 0:00-6:00. The main victims were young and middle-aged people (accounting for 72.3%), but accident-stricken children and elderly persons (over 70 years old) took up higher mortalities (30.2% and 40.7%, respectively). CONCLUSIONS The number of expressway traffic accidents and the economic losses are increasing year by year, with obvious uneven distribution at different places, different time and under different weather conditions. To reduce the accident frequency, it is important to strengthen the enforcement of traffic regulation, to balance the system of "person-vehicle-road", and to improve the safety consciousness of people.
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Affiliation(s)
- Xiao-Gang Zhao
- Department of Emergency, Second Affiliated Hospital, Medical College, Zhejiang University, Hangzhou 310009, China.
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33
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Zalutsky MR, Zhao XG, Alston KL, Bigner D. High-level production of alpha-particle-emitting (211)At and preparation of (211)At-labeled antibodies for clinical use. J Nucl Med 2001; 42:1508-15. [PMID: 11585865] [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: 02/21/2023] Open
Abstract
UNLABELLED In vitro and in vivo studies in human glioma models suggest that the antitenascin monoclonal antibody 81C6 labeled with the 7.2-h-half-life alpha-particle emitter (211)At might be a valuable endoradiotherapeutic agent for the treatment of brain tumors. The purpose of this study was to develop methods for the production of high levels of (211)At and the radiosynthesis of clinically useful amounts of (211)At-labeled human/mouse chimeric 81C6 antibody. METHODS (211)At was produced through the (209)Bi(alpha, 2n)(211)At reaction using an internal target system and purified by a dry distillation process. Antibody labeling was accomplished by first synthesizing N-succinimidyl 3-[(211)At]astatobenzoate from the corresponding tri-n-butyl tin precursor and reacting it with the antibody in pH 8.5 borate buffer. Quality control procedures consisted of methanol precipitation, size-exclusion high-performance liquid chromatography (HPLC), and pyrogen and sterility assays, as well as determination of the immunoreactive fraction by a rapid procedure using a recombinant tenascin fragment coupled to magnetic beads. RESULTS A total of 16 antibody labeling runs were performed. Using beam currents of 50-60 microA alpha-particles and irradiation times of 1.5-4.5 h, the mean (211)At production yield was 27.75 +/- 2.59 MBq/microA.h, and the maximum level of (211)At produced was 6.59 GBq after a 4-h irradiation at 55 microA. The decay-corrected distillation yield was 67% +/- 16%. The yield for the coupling of the (211)At-labeled active ester to the antibody was 76% +/- 8%. The fraction of (211)At activity that eluted with a retention time corresponding to intact IgG on HPLC was 96.0% +/- 2.5%. All preparations had a pyrogen level of <0.125 EU/mL and were determined to be sterile. The mean immunoreactive fraction for these 16 preparations was 83.3% +/- 5.3%. Radiolysis did not interfere with labeling chemistry or the quality of the labeled antibody product. CONCLUSION These results show that it is feasible to produce clinically relevant activities of (211)At-labeled antibodies and have permitted the initiation of a phase I trial of (211)At-labeled chimeric 81C6 administered directly into the tumor resection cavities of brain tumor patients.
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Affiliation(s)
- M R Zalutsky
- Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA
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Zhang ZD, Zheng JG, Skorvanek I, Kovac J, Yu JL, Dong XL, Li ZJ, Jin SR, Zhao XG, Liu W. Synthesis, characterization, and magnetic properties of carbon- and boron-oxide-encapsulated iron nanocapsules. J Nanosci Nanotechnol 2001; 1:153-158. [PMID: 12914046 DOI: 10.1166/jnn.2001.028] [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: 05/24/2023]
Abstract
Carbon- and boron-oxide-encapsulated iron nanocapsules have been synthesized by arc discharge in methane (CH4) and diborane (B2H6) atmospheres respectively. The characterization and magnetic properties of carbon- and boron-oxide-encapsulated iron nanocapsules [abbreviated as Fe(C) and Fe(B) respectively] were investigated and compared. The structure of the Fe(B) nanocapsules is different from that of the Fe(C) nanocapsules. The Fe(C) nanocapsules consist of a crystalline graphite shell and a core of alpha-Fe and/or Fe3C. The Fe(B) nanocapsules consist of an amorphous boron-oxide layer and a core of Fe(B) solid solution, alpha-Fe, gamma-Fe, FeB, and/or Fe3B phases. The saturation magnetizations of both the Fe(C) and the Fe(B) nanocapsules below 300 K decrease monotonically with increasing temperature. The coercivities of the Fe(C) and Fe(B) nanocapsules are almost 2 orders of magnitude higher than that of bulk Fe. The temperature dependence of magnetization at high temperatures indicates the existence of some phase transformations.
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Affiliation(s)
- Z D Zhang
- International Centre for Materials Physics, Institute of Metal Research, Academia Sinica, Shenyang 110016, Peoples' Republic of China
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Cokgor I, Akabani G, Kuan CT, Friedman HS, Friedman AH, Coleman RE, McLendon RE, Bigner SH, Zhao XG, Garcia-Turner AM, Pegram CN, Wikstrand CJ, Shafman TD, Herndon JE, Provenzale JM, Zalutsky MR, Bigner DD. Phase I trial results of iodine-131-labeled antitenascin monoclonal antibody 81C6 treatment of patients with newly diagnosed malignant gliomas. J Clin Oncol 2000; 18:3862-72. [PMID: 11078500 DOI: 10.1200/jco.2000.18.22.3862] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.3] [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: 11/20/2022] Open
Abstract
PURPOSE To determine the maximum-tolerated dose (MTD) of iodine-131 ((131)I)-labeled 81C6 antitenascin monoclonal antibody (mAb) administered clinically into surgically created resection cavities (SCRCs) in malignant glioma patients and to identify any objective responses with this treatment. PATIENTS AND METHODS In this phase I trial, newly diagnosed patients with malignant gliomas with no prior external-beam therapy or chemotherapy were treated with a single injection of (131)I-labeled 81C6 through a Rickham reservoir into the resection cavity. The initial dose was 20 mCi and escalation was in 20-mCi increments. Patients were observed for toxicity and response until death or for a minimum of 1 year after treatment. RESULTS We treated 42 patients with (131)I-labeled 81C6 mAb in administered doses up to 180 mCi. Dose-limiting toxicity was observed at doses greater than 120 mCi and consisted of delayed neurotoxicity. None of the patients developed major hematologic toxicity. Median survival for patients with glioblastoma multiforme and for all patients was 69 and 79 weeks, respectively. CONCLUSION The MTD for administration of (131)I-labeled 81C6 into the SCRC of newly diagnosed patients with no prior radiation therapy or chemotherapy was 120 mCi. Dose-limiting toxicity was delayed neurologic toxicity. We are encouraged by the survival and toxicity and by the low 2.5% prevalence of debulking surgery for symptomatic radiation necrosis.
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Affiliation(s)
- I Cokgor
- Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA.
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Lin G, Rose P, Chatson KB, Hawes EM, Zhao XG, Wang ZT. Characterization of two structural forms of otonecine-type pyrrolizidine alkaloids from Ligularia hodgsonii by NMR spectroscopy. J Nat Prod 2000; 63:857-860. [PMID: 10869221 DOI: 10.1021/np9906119] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Clivorine (1) and ligularine (2), two hepatotoxic otonecine-type pyrrolizidine alkaloids isolated from Ligularia hodgsonii, an antitussive traditional Chinese medicine, were investigated in CDCl(3) and D(2)O by various NMR techniques to delineate why this type of alkaloid displays uncharacteristic solubility properties by dissolving in both nonpolar organic and aqueous solutions. The results demonstrated that both alkaloids exist in a non-ionized form in CDCl(3), but in an ionized form in D(2)O, suggesting that this unique dual solubility may play a role in the intoxication resultant from consumption of water extracts of herbs, including herbal teas, containing otonecine-type pyrrolizidine alkaloids.
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Affiliation(s)
- G Lin
- Department of Pharmacology, The Chinese University of Hong Kong, Shatin, N.T. Hong Kong.
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Akabani G, Cokgor I, Coleman RE, González Trotter D, Wong TZ, Friedman HS, Friedman AH, Garcia-Turner A, Herndon JE, DeLong D, McLendon RE, Zhao XG, Pegram CN, Provenzale JM, Bigner DD, Zalutsky MR. Dosimetry and dose-response relationships in newly diagnosed patients with malignant gliomas treated with iodine-131-labeled anti-tenascin monoclonal antibody 81C6 therapy. Int J Radiat Oncol Biol Phys 2000; 46:947-58. [PMID: 10705017 DOI: 10.1016/s0360-3016(99)00500-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [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: 11/17/2022]
Abstract
PURPOSE The objective of this study was to perform the dosimetry and evaluate the dose-response relationships in newly diagnosed patients with malignant brain tumors treated by direct injections of (131)I-labeled 81C6 monoclonal antibody (MAb) into surgically created resection cavities (SCRCs). METHODS AND MATERIALS Absorbed doses to the 2-cm-thick shell as measured from the margins of the resection cavity interface were estimated for 42 patients with primary brain tumors. MR images were used to assess the enhanced-rim volume as a function of time after radiolabeled MAb therapy. Biopsy samples were obtained from 15 patients and 1 autopsy. RESULTS The average absorbed dose [range] to the 2-cm shell region was 32 [3-59] Gy. For the endpoint of minimal time to MR contrast enhancement, the optimal absorbed dose and initial dose-rate were 43 +/- 16 Gy and 0. 41 +/- 0.10 Gy/h, respectively. There was a correlation between the absorbed dose and dose rate to the shell region and biopsy outcome (tumor recurrence, radionecrosis, and tumor recurrence and/or radionecrosis). In this Phase I study, the maximum tolerated dose (MTD) was 120 mCi. At this MTD, the estimated average absorbed dose and initial dose rate to the 2-cm shell were 41 [9-89] Gy and 0.51 [0.24-1.13] Gy/h, respectively. These values are in agreement with the optimal values based on the time to MR lesion rim enhancement. CONCLUSIONS The average absorbed dose to the 2-cm shell region varied considerably and mainly depended on cavity volume. In future clinical trials, the administered activity of (131)I-labeled 81C6 MAb may be adjusted based on cavity volume in order to deliver the optimal absorbed dose of 43 Gy rather than giving a fixed administered activity.
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Affiliation(s)
- G Akabani
- Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA.
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Zalutsky MR, Xu FJ, Yu Y, Foulon CF, Zhao XG, Slade SK, Affleck DJ, Bast RC. Radioiodinated antibody targeting of the HER-2/neu oncoprotein: effects of labeling method on cellular processing and tissue distribution. Nucl Med Biol 1999; 26:781-90. [PMID: 10628557 DOI: 10.1016/s0969-8051(99)00060-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [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: 10/18/2022]
Abstract
Monoclonal antibody (MAb) internalization can have a major effect on tumor retention of radiolabel. Two anti-HER-2/neu MAbs (TA1 and 520C9) were radioiodinated using the iodogen, N-succinimidyl 5-iodo-3-pyridinecarboxylate (SIPC), and tyramine-cellobiose (TCB) methods. Paired-label studies compared internalization and cellular processing of the labeled MAbs by SKOv3 9002-18 ovarian cancer cells in vitro. Intracellular radioiodine activity for 520C9 was up to 2.6 and 3.0 times higher for SIPC and TCB labeling, respectively, compared with iodogen. Likewise, intracellular activity for TA1 was up to 2.3 and 2.9 times higher with the SIPC and TCB methods compared with iodogen labeling. Unfortunately, similar advantages in tumor accumulation were not achieved in athymic mice bearing SKOv3 9008-18 ovarian cancer xenografts.
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MESH Headings
- Animals
- Antibodies, Monoclonal/chemistry
- Antibodies, Monoclonal/immunology
- Antibodies, Monoclonal/metabolism
- Antibodies, Monoclonal/pharmacokinetics
- Cellobiose/chemistry
- Female
- Humans
- Immunoconjugates/chemistry
- Immunoconjugates/immunology
- Immunoconjugates/metabolism
- Immunoconjugates/pharmacokinetics
- Iodine Radioisotopes/chemistry
- Isotope Labeling/methods
- Mice
- Mice, Inbred BALB C
- Mice, Nude
- Nicotinic Acids/chemistry
- Ovarian Neoplasms
- Receptor, ErbB-2/biosynthesis
- Receptor, ErbB-2/genetics
- Receptor, ErbB-2/immunology
- Receptor, ErbB-2/metabolism
- Succinimides/chemistry
- Tissue Distribution
- Tumor Cells, Cultured
- Tyramine/chemistry
- Urea/analogs & derivatives
- Urea/chemistry
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Affiliation(s)
- M R Zalutsky
- Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA.
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39
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Akabani G, Reist CJ, Cokgor I, Friedman AH, Friedman HS, Coleman RE, Zhao XG, Bigner DD, Zalutsky MR. Dosimetry of 131I-labeled 81C6 monoclonal antibody administered into surgically created resection cavities in patients with malignant brain tumors. J Nucl Med 1999; 40:631-8. [PMID: 10210222] [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: 02/12/2023] Open
Abstract
UNLABELLED The objective of this study was to perform the dosimetry of 131I-labeled 81C6 monoclonal antibody (MAb) in patients with recurrent malignant brain tumors, treated by direct injections of MAb into surgically created resection cavities (SCRCs). METHODS Absorbed dose estimates were performed for nine patients. Dosimetry was performed retrospectively using probe counts (during patient isolation) and whole-body and SPECT images thereafter. Absorbed doses were calculated for the SCRC interface and for regions of interest (ROIs) 1 and 2 cm thick, measured from the margins of cavity interface. Also, mean absorbed doses were calculated for normal brain, liver, spleen, thyroid gland, stomach, bone marrow and whole body. The average residence time for the SCRC was 111 h (65-200h). RESULTS The average absorbed dose per unit injected activity (range) to the SCRC interface and ROIs 1 and 2 cm thick from the cavity interface were 31.9 (7.8-84.2), 1.9 (0.7-3.6) and 1.0 (0.4-1.8) cGy/MBq, respectively. Average absorbed doses per unit administered activity to brain, liver, spleen, thyroid, stomach, bone marrow and whole body were 0.18, 0.03, 0.08, 0.05, 0.02, 0.02 and 0.01 cGy/MBq, respectively. The high absorbed dose delivered to the SCRC interface may have produced an increase in cavity volume independent of tumor progression. CONCLUSION At the maximum tolerated dose of 3700 MBq 131I-labeled 81C6 MAb, the absorbed doses to the SCRC interface and ROIs of 1 and 2 cm thickness were estimated to be 1180, 71 and 39 Gy, respectively. The estimated average absorbed dose to the brain was 6.5 Gy. There was no neurological toxicity and minimal hematologic toxicity at this maximum tolerated administration level.
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Affiliation(s)
- G Akabani
- Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA
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Bigner DD, Brown MT, Friedman AH, Coleman RE, Akabani G, Friedman HS, Thorstad WL, McLendon RE, Bigner SH, Zhao XG, Pegram CN, Wikstrand CJ, Herndon JE, Vick NA, Paleologos N, Cokgor I, Provenzale JM, Zalutsky MR. Iodine-131-labeled antitenascin monoclonal antibody 81C6 treatment of patients with recurrent malignant gliomas: phase I trial results. J Clin Oncol 1998; 16:2202-12. [PMID: 9626222 DOI: 10.1200/jco.1998.16.6.2202] [Citation(s) in RCA: 127] [Impact Index Per Article: 4.9] [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: 11/20/2022] Open
Abstract
PURPOSE To determine the maximum-tolerated dose (MTD) of iodine 131 (131I)-labeled 81C6 monoclonal antibody (mAb) in brain tumor patients with surgically created resection cavities (SCRCs) and to identify any objective responses to this treatment. METHODS In this phase I trial, eligible patients were treated with a single injection of 131I-labeled 81C6. Cohorts of three to six patients were treated with escalating dosages of 131I (starting dose of 20 mCi with a 20-mCi escalation in subsequent cohorts) administered through an Ommaya reservoir in the SCRC. Patients were followed up for toxicity and response until death or for a minimum of 1 year after treatment. The SCRC patients, who were previously irradiated, were followed up without additional treatment unless progressive disease was identified. RESULTS We administered 36 treatments of 131I doses up to 120 mCi to 34 previously irradiated patients with recurrent or metastatic brain tumors. Dose-limiting toxicity was reached at 120 mCi and was limited to neurologic or hematologic toxicity. None of the patients treated with less than 120 mCi developed significant neurologic toxicity; one patient developed major hematologic toxicity (MHT). The estimated median survival for patients with glioblastoma multiforme (GBM) and for all patients was 56 and 60 weeks, respectively. CONCLUSION The MTD for administration of 131I-labeled 81C6 into the SCRCs of previously irradiated patients with recurrent primary or metastatic brain tumors was 100 mCi. The dose-limiting toxicity was neurologic toxicity. We are encouraged by the minimal toxicity and survival in this phase I trial. Radiolabeled mAbs may improve the current therapy for brain tumor patients.
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Affiliation(s)
- D D Bigner
- Department of Pathology, Duke University Medical Center, Durham, NC 27710, USA.
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Lin G, Zhou KY, Zhao XG, Wang ZT, But PP. Determination of hepatotoxic pyrrolizidine alkaloids by on-line high performance liquid chromatography mass spectrometry with an electrospray interface. Rapid Commun Mass Spectrom 1998; 12:1445-1456. [PMID: 9796532 DOI: 10.1002/(sici)1097-0231(19981030)12:20<1445::aid-rcm356>3.0.co;2-g] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The present study describes the determination of two different types of hepatotoxic pyrrolizidine alkaloids (PAs) and also distinguishing the hepatotoxic PAs from non-toxic ones by both in-source collision-induced dissociation high performance liquid chromatography mass spectrometry (CID-HPLC/MS) and HPLC/MS/MS (CID in the collision cell), using electrospray ionization. The mass spectra provided molecular ions and characteristic fragment ions, which could be used readily for a rapid identification of different types of PAs. Applications of both in-source CID-HPLC/MS and HPLC/MS/MS analytical methods were successful for the determination of PAs in blood samples obtained from rats dosed with PAs and in the PA-containing plant. The results demonstrated that the developed HPLC/MS methods with two different CID techniques provided a very simple and rapid analysis for an unequivocal diagnosis of PA poisoning and for definitive identification of PAs in plants or herbal medicines.
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Affiliation(s)
- G Lin
- Department of Pharmacology, Chinese University of Hong Kong, Shatin, SAR
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Liew CC, Hwang DM, Wang RX, Ng SH, Dempsey A, Wen DH, Ma H, Cukerman E, Zhao XG, Liu YQ, Qiu XK, Zhou XM, Gu JR, Tsui S, Fung KP, Waye MM, Lee CY. Construction of a human heart cDNA library and identification of cardiovascular based genes (CVBest). Mol Cell Biochem 1997; 172:81-7. [PMID: 9278234] [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: 02/05/2023]
Abstract
The availability of high quality cDNA libraries is often crucial to the successful identification and characterization of genes. The concepts and potential pitfalls of constructing cDNA libraries are presented. Various applications requiring high quality cDNA libraries are outlined, including large-scale single pass sequencing of cDNA clones to generate expressed sequence tags (ESTs) and differential screening of cDNA libraries. The usefulness of combining such approaches for the discovery of novel disease-related and cardiovascular-based ESTs (CVBest) is discussed.
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Affiliation(s)
- C C Liew
- Department of Clinical Biochemistry, The Centre for Cardiovascular Research, The Toronto Hospital, Ontario, Canada
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Abstract
The HER-2/neu oncogene encodes a 185 kDa phosphoglycoprotein that is overexpressed in breast, ovarian and other cancers. Seven monoclonal antibodies reactive with oncoprotein were labeled with 131I. In vitro experiments with SKOv3 9002-18 cells determined binding affinity, internalization and degradation. The biodistribution of these antibodies in comparison to 125I-labeled nonspecific antibody was measured in athymic mice with SKOv3 9002-18 ovarian carcinoma xenografts. Antibody 520C9 exhibited the highest and most specific retention in tumor, peaking at 17.4 +/- 5.6% ID/g at 24 h.
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Affiliation(s)
- F J Xu
- Division of Medicine, University of Texas M.D. Anderson Cancer Center Houston 77030, USA
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Vaidyanathan G, Zhao XG, Strickland DK, Zalutsky MR. No-carrier-added iodine-131-FIBG: evaluation of an MIBG analog. J Nucl Med 1997; 38:330-4. [PMID: 9025764] [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: 02/03/2023] Open
Abstract
UNLABELLED The purpose of this study was to evaluate the properties of 4-fluoro-3-[131I]iodobenzylguanidine ([131I]FIBG), a potential neuroendocrine tumor and myocardial imaging radiopharmaceutical. METHODS The binding of [131I]FIBG and [125I]MIBG was compared in vitro using the SK-N-SH human neuroblastoma cell line. The role of the active uptake-1 mechanism was investigated by determining the effect on cell binding of desipramine (DMI), ouabain, norepinephrine (NE), unlabeled MIBG and FIBG and by incubation at 4 degrees C. Finally, the tissue distributions of [131I]FIBG and [125I]MIBG were compared in normal mice. RESULTS The specific binding of [131I]FIBG remained fairly constant (45%-60%) over a 2-3-log activity range and consistently was 11%-14% higher (p < 0.05) than that of [125I]MIBG. The uptake of [131I]FIBG was reduced to 13% of control values by 1.5 microM DMI, to 31% by 1 mM ouabain, to 8% by lower temperature, to 8% by 50 microM NE and to 6% and 5% by 10 microM each of unlabeled MIBG and FIBG, respectively. The amount of [131I]FIBG retained by SK-N-SH cells was significantly higher than that of [125I]MIBG with the maximum difference observed at 72 hr. In mice, the uptake of [131I]FIBG was higher than that of [125I]MIBG not only in target tissues (heart and adrenals) but also in many other normal tissues; conversely, thyroidal uptake of [131I]FIBG was 2-3-fold lower than that of [125I]MIBG. The uptake of [131I]FIBG in the heart and adrenals was reduced by DMI. CONCLUSION Iodine-131-FIBG is an analog of MIBG with prolonged binding to neuroblastoma cells in vitro and retention in the myocardium in vivo.
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Affiliation(s)
- G Vaidyanathan
- Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA
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Vaidyanathan G, Zhao XG, Larsen RH, Zalutsky MR. 3-[211At]astato-4-fluorobenzylguanidine: a potential therapeutic agent with prolonged retention by neuroblastoma cells. Br J Cancer 1997; 76:226-33. [PMID: 9231923 PMCID: PMC2223928 DOI: 10.1038/bjc.1997.366] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [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] [Indexed: 02/04/2023] Open
Abstract
An analogue of meta-iodobenzylguanidine (MIBG) in which an aromatic hydrogen was replaced with fluorine has been found to possess many properties similar to those of the parent compound. Moreover, 4-fluoro-3-iodobenzylguanidine (FIBG) was retained in vitro by human neuroblastoma cells to a much greater extent than MIBG itself. Since alpha-emitters such as 211At could be valuable for the treatment of micrometastatic disease, an FIBG analogue in which the iodine atom is replaced by 211At would be of interest. In this study, we have evaluated the in vitro and in vivo properties of 3-[211At]astato-4-fluorobenzylguanidine ([211At]AFBG). The specific binding of [211At]AFBG to SK-N-SH human neuroblastoma cells remained fairly constant over 2- to 3-log activity range and was similar to that of [131I]MIBG. The uptake of [211At]AFBG by this cell line was reduced by desipramine, ouabain, 4 degrees C incubation, noradrenaline, unlabelled MIBG and FIBG, suggesting that its uptake is specifically mediated through an active uptake-1 mechanism. Over the 16 h period studied, the amount of [211At]AFBG retained was similar to that of [131I]FIBG, whereas the per cent of retained meta-[211At]astatobenzylguanidine ([211At]MABG) was considerably less than that of [131I]FIBG (53% vs 75%; P < 0.05). The IC50 values for the inhibition of uptake of [131I]MIBG, [211At]MABG, [125I]FIBG and [211At]AFBG by unlabelled MIBG were 209, 300, 407 and 661 nM respectively, suggesting that the affinities of these tracers for the noradrenaline transporter in SK-N-SH cells increase in that order. Compared with [211At]MABG, higher uptake of [211At]AFBG was seen in vivo in normal mouse target tissues such as heart and, to a certain extent, in adrenals. That the uptake of [211At]AFBG in these tissues was related to the uptake-1 mechanism was demonstrated by its reduction when mice were pretreated with desipramine. However, the stability of [211At]AFBG towards in vivo dehalogenation was less than that of [211At]MABG, as evidenced by the higher uptake of 211At in thyroid, spleen, lungs and stomach.
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Affiliation(s)
- G Vaidyanathan
- Department of Radiology, Duke University Medical Center, Durham, NC 27710, USA
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Niu Q, Zhao XG, Georgakis GA, Raizen MG. Atomic Landau-Zener tunneling and Wannier-Stark ladders in optical potentials. Phys Rev Lett 1996; 76:4504-4507. [PMID: 10061308 DOI: 10.1103/physrevlett.76.4504] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Brown MT, Coleman RE, Friedman AH, Friedman HS, McLendon RE, Reiman R, Felsberg GJ, Tien RD, Bigner SH, Zalutsky MR, Zhao XG, Wikstrand CJ, Pegram CN, Herndon JE, Vick NA, Paleologos N, Fredericks RK, Schold SC, Bigner DD. Intrathecal 131I-labeled antitenascin monoclonal antibody 81C6 treatment of patients with leptomeningeal neoplasms or primary brain tumor resection cavities with subarachnoid communication: phase I trial results. Clin Cancer Res 1996; 2:963-72. [PMID: 9816257] [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: 02/09/2023]
Abstract
We aimed to determine the maximum tolerated dose (MTD) of 131I-labeled 81C6 in patients with leptomeningeal neoplasms or brain tumor resection cavities with subarachnoid communication and to identify any objective responses. 81C6 is a murine IgG monoclonal antibody that reacts with tenascin in gliomas/carcinomas but does not react with normal adult brain. 131I-labeled 81C6 delivers intrathecal (IT) radiation to these neoplasms. This study was a Phase I trial in which patients were treated with a single IT dose of 131I-labeled 81C6. Cohorts of three to six patients were treated with escalating doses of 131I (starting dose, 40 mCi; 20 mCi escalations) on 10 mg 81C6. MTD is defined as the highest dose resulting in serious toxicity in no more than two of six patients. Serious toxicity is defined as grade III/IV nonhematological toxicity or major hematological toxicity. We treated 31 patients (8 pediatric and 23 adult). Eighteen had glioblastoma multiforme. Patients were treated with 131I doses from 40 to 100 mCi. Hematological toxicity was dose limiting and correlated with the administered 131I dose. No grade III/IV nonhematological toxicities were encountered. A partial response occurred in 1 patient and disease stabilization occurred in 13 (42%) of 31 patients. Twelve patients are alive (median follow-up, > 320 days); five are progression free >409 days median posttreatment. The MTD of a single IT administration of 131I-labeled 81C6 in adults is 80 mCi 131I-labeled 81C6. The MTD in pediatric patients was not reached at 131I doses up to 40 mCi normalized for body surface area.
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Affiliation(s)
- M T Brown
- Duke University Medical Center, Durham, North Carolina 27710, USA
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Hone DW, Zhao XG. Time-periodic behavior of multiband superlattices in static electric fields. Phys Rev B Condens Matter 1996; 53:4834-4837. [PMID: 9984044 DOI: 10.1103/physrevb.53.4834] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abstract
Gliomas affect 15,000 to 17,000 Americans every year and carry a dismal prognosis. The potential of immunologically mediated diagnosis and therapy, although greatly enhanced since the advent of monoclonal antibodies, has not been fully realized due to significant problems, most especially the challenge of identifying antigenic molecules specific to glial tumors. Other problematic issues include antigen-associated factors such as heterogeneity, modulation, shedding, and cross-reactivity with normal cells, and factors associated with therapeutic agent delivery, typically variable tumor perfusion and unfavorable diffusional forces in tumor microenvironment. An understanding of these problems called for the delineation of operationally specific antigens (tumor-associated antigens not expressed by the normal central nervous system) combined with the use of compartmental therapeutic approaches to increase the specificity of therapy. Numerous antigens have been identified and are classified as extracellular/matrix-associated, membrane-associated, and intracellular antigens. Nevertheless, only a few have been demonstrated to be of significant therapeutic and diagnostic utility. These few include the extracellular matrix-associated antigens tenascin and GP 240, defined by the monoclonal antibodies 81C6 and Mel-14, both of which are now in Phase I clinical trials, and membrane-associated ganglioside molecules, primarily 3', 6'-isoLD1, defined by the antibody DMAb-22. Recent identification of the overexpression of a deletion variant of the epidermal growth factor receptor (EGFRvIII) in up to 50% of the more malignant glial tumors and the subsequent creation of monoclonal antibodies that are specific to this molecule and do not recognize the wild-type EGFR provide the most exciting development yet in the design of specific antiglioma immunoconjugates. In addition, the tumor-specific nature of EGFRvIII combined with improved knowledge of immune mechanisms, especially in the context of the central nervous system, will facilitate the design of highly selective cell-mediated therapeutic approaches with a view toward obtaining tumor-specific immunity.
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Affiliation(s)
- S N Kurpad
- Department of Pathology, Duke University Medical Center, Durham, North Carolina 27710, USA
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