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Bu W, Sun X, Xue X, Geng S, Yang T, Zhang J, Li Y, Feng C, Liu Q, Zhang X, Li P, Liu Z, Shi Y, Shao C. Early onset of pathological polyploidization and cellular senescence in hepatocytes lacking RAD51 creates a pro-fibrotic and pro-tumorigenic inflammatory microenvironment. Hepatology 2024:01515467-990000000-00800. [PMID: 38466833 DOI: 10.1097/hep.0000000000000821] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Accepted: 02/06/2024] [Indexed: 03/13/2024]
Abstract
BACKGROUND AND AIMS RAD51 recombinase (RAD51) is a highly conserved DNA repair protein and is indispensable for embryonic viability. As a result, the role of RAD51 in liver development and function is unknown. Our aim was to characterize the function of RAD51 in postnatal liver development. APPROACH AND RESULTS RAD51 is highly expressed during liver development and during regeneration following hepatectomy and hepatic injury, and is also elevated in chronic liver diseases. We generated a hepatocyte-specific Rad51 deletion mouse model using Alb -Cre ( Rad51 -conditional knockout (CKO)) and Adeno-associated virus 8-thyroxine-binding globulin-cyclization recombination enzyme to evaluate the function of RAD51 in liver development and regeneration. The phenotype in Rad51 -CKO mice is dependent on CRE dosage, with Rad51fl/fl ; Alb -Cre +/+ manifesting a more severe phenotype than the Rad51fl/fl ; Alb -Cre +/- mice. RAD51 deletion in postnatal hepatocytes results in aborted mitosis and early onset of pathological polyploidization that is associated with oxidative stress and cellular senescence. Remarkable liver fibrosis occurs spontaneously as early as in 3-month-old Rad51fl/fl ; Alb -Cre +/+ mice. While liver regeneration is compromised in Rad51 -CKO mice, they are more tolerant of carbon tetrachloride-induced hepatic injury and resistant to diethylnitrosamine/carbon tetrachloride-induced HCC. A chronic inflammatory microenvironment created by the senescent hepatocytes appears to activate ductular reaction the transdifferentiation of cholangiocytes to hepatocytes. The newly derived RAD51 functional immature hepatocytes proliferate vigorously, acquire increased malignancy, and eventually give rise to HCC. CONCLUSIONS Our results demonstrate a novel function of RAD51 in liver development, homeostasis, and tumorigenesis. The Rad51 -CKO mice represent a unique genetic model for premature liver senescence, fibrosis, and hepatocellular carcinogenesis.
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Affiliation(s)
- Wenqing Bu
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Xue Sun
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Xiaotong Xue
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Shengmiao Geng
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Tingting Yang
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Jia Zhang
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Yanan Li
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Chao Feng
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Qiao Liu
- Key Laboratory of Experimental Teratology, Ministry of Education, Department of Molecular Medicine and Genetics, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Xiyu Zhang
- Key Laboratory of Experimental Teratology, Ministry of Education, Department of Molecular Medicine and Genetics, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Peishan Li
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Zhaojian Liu
- Key Laboratory of Experimental Teratology, Ministry of Education, Department of Molecular Medicine and Genetics, School of Basic Medical Sciences, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China
| | - Yufang Shi
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
| | - Changshun Shao
- State Key Laboratory of Radiation Medicine and Protection, The First Affiliated Hospital of Soochow University, State Key Laboratory of Radiation Medicine and Protection, Institutes for Translational Medicine, Soochow University Suzhou Medical College, Suzhou, Jiangsu, China
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Zhang D, Yang J, Du S, Bu W, Guo YC. An Uncertainty-Aware and Sex-Prior Guided Biological Age Estimation From Orthopantomogram Images. IEEE J Biomed Health Inform 2023; 27:4926-4937. [PMID: 37478028 DOI: 10.1109/jbhi.2023.3297610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2023]
Abstract
Bone age, as a measure of biological age (BA), plays an important role in a variety of fields, including forensics, orthodontics, sports, and immigration. Despite its significance, accurate estimation of BA remains a challenge due to the uncertainty error between BA and chronological age (CA) caused by individual diversity and the difficult integration of multiple factors, such as sex, and identified or measured anatomical structures, into the estimation process. To address problems, we propose an uncertainty-aware and sex-prior guided biological age estimation from orthopantomogram images (OPGs), named UASP-BAE, which models uncertainty errors while setting sex dimorphism as tractive features to enhance age-related specific features, aiming to improve the accuracy of BA estimation. Furthermore, considering the global relevance of the anatomic structure, such as the mandible, teeth, maxillary sinus, etc., a cross-attention module based on CNN and self-attention is proposed to mine the local texture and global semantic features of OPGs. Moreover, we design a novel age composition loss by cross-entropy, probability bias, and regression functions, aiming at evaluating BA's uncertainty errors and results to obtain an accurate and robust model. On 10703 OPGs from 5.00 to 25.00 years of age, our model had a best MAE value of 0.8005 years and higher than the comparison popular algorithms, which also demonstrates the method's potential for improved accuracy in BA estimation.
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Bu W, Ji L, Han M, Wu Z, Sultan B, Chen T, Tang Y, Guo Y, Wang F. Accuracy comparison of tooth volume and mesiodistal diameter measurements for sex dimorphism based on cone-beam computed tomography: a study for the northern Chinese population. Forensic Sci Res 2023; 8:133-139. [PMID: 37621453 PMCID: PMC10445665 DOI: 10.1093/fsr/owad004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 12/18/2022] [Accepted: 02/06/2023] [Indexed: 08/26/2023] Open
Abstract
Sex estimation based on teeth could help to narrow the scope for individual identification. According to the different teeth morphology among both genders, we plan to establish a sex estimation method for the northern Chinese population through mesiodistal diameter and teeth volume measurements and compare the accuracy of the two methods. In this study, measurements were taken from cone-beam computed tomography images collected from 142 males and 140 females aged 21-59 years. The mesiodistal diameter and volume of the left canines and the first molars in both upper and lower jaws were measured and analyzed for suitable coefficients. We selected 80% samples as the training set to set up the logistic regression formulas and 20% as the test set to obtain accuracy. The accuracy of sex estimation by mesiodistal diameter can reach 87.50%, and the volume is up to 78.57%. The measurement of mesiodistal diameter is less time-consuming. This work established and tested a method to estimate sex for the northern Chinese population. Results showed that sex estimation based on the mesiodistal diameter of teeth has higher accuracy than the method based on teeth volume.
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Affiliation(s)
- Wenqing Bu
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
- Department of Orthodontics, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
| | - Lingling Ji
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
- Department of Orthodontics, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
| | - Mengqi Han
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
- Department of Orthodontics, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
| | - Zixuan Wu
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
- Department of Orthodontics, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
| | - Badr Sultan
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
- Department of Orthodontics, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
| | - Teng Chen
- College of Medicine and Forensics, Xi’an Jiaotong University Health Science Center, Xi’an, China
| | - Yu Tang
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
| | - Yucheng Guo
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
- Department of Orthodontics, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
| | - Fei Wang
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
- Department of Orthodontics, College of Stomatology, Xi’an Jiaotong University, Xi’an, China
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Mohamed AS, Habumugisha J, Cheng B, Zhao M, Bu W, Liu L, Guo Y, Zou R, Wang F. A cone-beam computed tomography study of hyoid bone position and airway volume in subjects with obstructive and nonobstructive adenotonsillar hypertrophy. Angle Orthod 2023:491452. [PMID: 36928926 DOI: 10.2319/110822-769.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 02/01/2023] [Indexed: 03/18/2023] Open
Abstract
OBJECTIVES To investigate hyoid bone position and airway volume in subjects with adenoid hypertrophy, tonsillar hypertrophy, and adenotonsillar hypertrophy compared to subjects with nonobstructive adenoids or tonsils and to assess the correlation between hyoid bone and airway parameters. MATERIALS AND METHODS A total of 121 subjects were grouped based on adenoid or tonsillar hypertrophy into four groups, as follows: (1) control group (C-group), (2) adenoid hypertrophy group (AH-group), (3) adenotonsillar hypertrophy group (ATH-group), and (4) tonsillar hypertrophy group (TH-group). Hyoid bone position and airway volumes were measured. The Kruskal-Wallis test was used for intergroup comparison, followed by pairwise comparison using the Mann-Whitney U-test. Bivariate correlation was conducted using Spearman correlation coefficients. Multiple linear regression was performed to create a model for airway volume based on hyoid bone predictive variables. RESULTS No significant difference was found between subjects with isolated adenoid or tonsillar hypertrophy compared to the C-group. However, the ATH-group exhibited a significantly decreased hyoid bone vertical distance (HV), total airway volume (TA volume), and retroglossal airway volume (RG volume) compared to the C-group. HV and age had a high potential in terms of explaining the RG volume, whereas the TA volume and retropalatal airway volume (RP volume) models were not as successful as the RG volume counterpart. CONCLUSIONS Subjects in ATH-group were characterized by an elevated hyoid bone position and constricted TA volume and RG volume compared to those in the C-group. HV and age were predictor variables that best explained retroglossal airway volume.
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Zhao M, Han M, Habumugisha J, Mohamed AS, Bu W, Guo Y, Zou R, Wang F. Electromyographic activities of the jaw and facial muscles in subjects with different vertical skeletal patterns and breathing modes. J Oral Rehabil 2023; 50:351-359. [PMID: 36704914 DOI: 10.1111/joor.13424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 11/21/2022] [Accepted: 01/13/2023] [Indexed: 01/28/2023]
Abstract
BACKGROUND Mouth breathing (MB) can affect morphological changes in the craniofacial structures, electromyography is widely used for quantitative analysis of muscle function. OBJECTIVE The aim was to evaluate the electromyographic (EMG) activities of the anterior temporalis (TA), masseter muscle (MM), orbicularis oris superior (OOS) and mentalis muscle (MT) in children with different vertical skeletal patterns and breathing modes during rest and various functional mandibular movements. METHODS BioEMG III was used to measure the variations in EMG activities of TA, MM, OOS, and MT in 185 subjects aged 6-12 years during continuous clenching, rest, maximal intercuspation, lips closed lightly and swallowing. RESULTS The results of logistic regression analysis showed that the model with vertical skeletal patterns as the dependent variable was ineffective (p = .106), while the model with breathing modes as the dependent variable was effective (p = .000). When considering both vertical skeletal patterns and breathing modes, the following significant differences were found. (1) In the normal-angle group, the EMG ratio in OOS with lips closed lightly of MB was significantly higher than NB (p = .005). (2) In the low-angle group, EMG ratios in TA and MM during the swallowing of MB were significantly lower than NB (p = .020, p = .040, respectively). (3) In the high-angle group, EMG ratios of MB were significantly higher in MT during continuous clenching, rest, lips closed lightly and swallowing (p = .038, p = .036, p = .005, p = .028, respectively), and OOS with lips closed lightly compared to NB (p = .005). CONCLUSION Breathing modes and vertical skeletal patterns interacted to alter maxillofacial EMG activities, with breathing modes having a greater effect.
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Affiliation(s)
- Minyue Zhao
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, China.,Department of Orthodontics, Xi'an Jiaotong University, Xi'an, China
| | - Mengqi Han
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, China.,Department of Orthodontics, Xi'an Jiaotong University, Xi'an, China
| | - Janvier Habumugisha
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, China.,Department of Orthodontics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan
| | - Amin S Mohamed
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, China.,Department of Orthodontics, Xi'an Jiaotong University, Xi'an, China
| | - Wenqing Bu
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, China.,Department of Orthodontics, Xi'an Jiaotong University, Xi'an, China
| | - Yucheng Guo
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, China.,Department of Orthodontics, Xi'an Jiaotong University, Xi'an, China
| | - Rui Zou
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, China.,Department of Orthodontics, Xi'an Jiaotong University, Xi'an, China
| | - Fei Wang
- Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, Clinical Research Center of Shaanxi Province for Dental and Maxillofacial Diseases, College of Stomatology, Xi'an Jiaotong University, Xi'an, China.,Department of Orthodontics, Xi'an Jiaotong University, Xi'an, China
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Guo YC, Saif BS, Bu W, Zhao J. Authors' response. Am J Orthod Dentofacial Orthop 2022; 161:765. [PMID: 35636872 DOI: 10.1016/j.ajodo.2022.02.012] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 02/22/2022] [Indexed: 11/27/2022]
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Zhao R, Bu W, Chen Y, Chen X. The Dose-Response Associations of Sedentary Time with Chronic Diseases and the Risk for All-Cause Mortality Affected by Different Health Status: A Systematic Review and Meta-Analysis. J Nutr Health Aging 2020; 24:63-70. [PMID: 31886810 DOI: 10.1007/s12603-019-1298-3] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
PURPOSE To determine the dose-response associations of sedentary behaviour with cardiovascular diseases (CVD), cancer, and all-cause mortality, and to examine whether the sedentary-associated all-cause mortality risk was affected by appearance of diabetes and hypertension, physical activity, and body mass index (BMI). DESIGN We carried out a systematic review and meta-analysis to search Medline, SportDiscus, and Web of Science for eligible studies. SETTINGS Prospective cohort studies that reported sedentary time and CVD, cancer, and mortality incidents. MEASUREMENTS Two authors independently extracted data based on predefined criteria. The effect estimates were evaluated by hazard ratios (HRs) with 95% confidences (CIs). RESULTS Twenty-four studies met the inclusion criteria. Sitting time showed dose-response associations with CVD, cancer, and all-cause mortality, with each 1-hour increment of sitting time daily accounting for HRs 1.04 (95% CIs 1.02-1.07), 1.01 (1.00-1.02), and 1.03 (1.02-1.03), respectively. The link between sitting time and CVD and all-cause mortality was non-linear (pnon-linear < 0.0001). The relationship between TV viewing and CVD and all-cause mortality was dose-dependent, with HRs 1.07 (1.06-1.09) and 1.04 (1.01-1.06) for per 1-hour increment of TV time every day, respectively. The regression was curved (pnon-linear < 0.0001). When the analysis was stratified by the percentage of diabetes and hypertension, BMI values, and physical activity levels, we found that higher BMI and a greater percentage of diabetes and hypertension further increased all-cause mortality risk in the most sedentary populations, whereas higher physical activity levels decreased it. CONCLUSION Sitting time and TV viewing significantly increased cardiovascular, cancer, and mortality risk; the associations were dose-dependent. More importantly, sedentary behaviour in combination with chronic diseases or high BMI increased all-cause mortality risk whereas physical activity was likely to alleviate the adverse associations.
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Affiliation(s)
- R Zhao
- Renqing Zhao, Yangzhou University, College of Physical Education, 88 Daxue South Road, Yangzhou, Jiangsu 225009, China. Tel: 8651487972015.
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Hodgman SS, Bu W, Mann SB, Khakimov RI, Truscott AG. Higher-Order Quantum Ghost Imaging with Ultracold Atoms. Phys Rev Lett 2019; 122:233601. [PMID: 31298918 DOI: 10.1103/physrevlett.122.233601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 04/04/2019] [Indexed: 06/10/2023]
Abstract
Ghost imaging is a quantum optics technique that uses correlations between two beams to reconstruct an image from photons that do not interact with the object being imaged. While pairwise (second-order) correlations are usually used to create the ghost image, higher-order correlations can be utilized to improve the performance. In this Letter, we demonstrate higher-order atomic ghost imaging, using entangled ultracold metastable helium atoms from an s-wave collision halo. We construct higher-order ghost images up to fifth order and show that using higher-order correlations can improve the visibility of the images without impacting the resolution. This is the first demonstration of higher-order ghost imaging with massive particles and the first higher-order ghost imaging protocol of any type using a quantum source.
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Affiliation(s)
- S S Hodgman
- Research School of Physics and Engineering, Australian National University, Canberra 2601, Australia
| | - W Bu
- Research School of Physics and Engineering, Australian National University, Canberra 2601, Australia
| | - S B Mann
- Research School of Physics and Engineering, Australian National University, Canberra 2601, Australia
| | - R I Khakimov
- Research School of Physics and Engineering, Australian National University, Canberra 2601, Australia
| | - A G Truscott
- Research School of Physics and Engineering, Australian National University, Canberra 2601, Australia
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Bu W, Li Y. Abstract P5-07-04: Transition from a pre-malignant lesion to cancer does not require stemness of the cancer-originating cells in the lesion. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p5-07-04] [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]
Abstract
Abstract
The precancerous lesion is the final step before malignancy, and is thus a key step to cancer prevention. Precancerous lesions are heterogeneous harboring distinct subsets of cells from stem cells to differentiated cells. Whether the stem cells or other subsets in these precancerous lesions are responsible for the eventual cancer remains unanswered. Here, we report that in the precancerous lesions of the MMTV-Wnt1 model of basal-like breast cancer, there exist the stem cell-enriched keratin 6a+ subset and more differentiated WAP+ cell subset. We demonstrate that both mutated Ras and B-Raf can robustly transform both cell subsets into cancer. These data suggest that multiple cell subsets in precancerous early lesions can evolve into cancer. This finding indicates that cancer prevention should target both self-renewing cells and other cell subsets in developing precancerous lesions in high-risk individuals.
Citation Format: Bu W, Li Y. Transition from a pre-malignant lesion to cancer does not require stemness of the cancer-originating cells in the lesion [abstract]. In: Proceedings of the 2016 San Antonio Breast Cancer Symposium; 2016 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2017;77(4 Suppl):Abstract nr P5-07-04.
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Affiliation(s)
- W Bu
- Baylor College of Medicine, Houston, TX
| | - Y Li
- Baylor College of Medicine, Houston, TX
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Johnston A, Garcia S, Hein S, Bu W, Yi L. Abstract P2-07-08: Neuroleptics in breast cancer risk. Cancer Res 2017. [DOI: 10.1158/1538-7445.sabcs16-p2-07-08] [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]
Abstract
Abstract
This abstract was not presented at the symposium.
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Affiliation(s)
| | - S Garcia
- Baylor College of Medicine, Houston, TX
| | - S Hein
- Baylor College of Medicine, Houston, TX
| | - W Bu
- Baylor College of Medicine, Houston, TX
| | - L Yi
- Baylor College of Medicine, Houston, TX
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Zheng ZY, Bu W, Tian L, Fan C, Gao X, Zhang X, Yu C, Wang H, Liao YH, Li Y, Lewis MT, Edwards D, Zwaka TP, Hilsenbeck SG, Medina D, Perou CM, Creighton CJ, Zhang XH, Chang EC. Abstract P2-06-11: Wild type N-Ras, overexpressed in basal-like breast cancer, promotes tumor formation by inducing IL8 secretion via JAK2 activation. Cancer Res 2016. [DOI: 10.1158/1538-7445.sabcs15-p2-06-11] [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]
Abstract
Abstract
"Basal-like" breast cancer (BLBC) is a very aggressive subtype of breast cancer. BLBC has very poor prognosis — median time to distant recurrence is just 2.6 years vs. 5 years overall, and survival time from diagnosis of distant metastatic disease is 9 months vs. 22 months. BLBC tumors usually do not express ER, Her2, or progesterone receptor. As such, they cannot be treated by the current targeted therapies, which target these molecules. What drive the formation and progression of BLBCs is largely unclear.
Ras GTPases are best known for mediating growth factor signaling. Oncogenic mutations in the RAS genes, K-RAS in particular, are found in more than 30% of human tumors. Surprisingly, oncogenic RAS mutations are rare in breast cancer. However, we found that wild-type N-RAS is overexpressed in BLBCs, possibly partly via promoter demethylation, but not in other breast cancer subtypes. Repressing N-RAS inhibits transformation and tumor growth, while overexpressing it enhances these processes even in preinvasive BLBC cells. In contrast, in breast cancer cells of other subtypes, repressing N-RAS expression does not affect growth and transforming activities. We identified N-Ras-responsive genes, most of which encode chemokines and cytokines, e.g., IL8. High expression levels of these N-Ras-responsive genes as well as of N-RAS itself in tumors correlate with poor patient outcome. N-Ras, but not K-Ras, induces IL8 by binding and activating the cytoplasmic pool of JAK2; IL8 then acts on both the cancer cells and stromal fibroblasts.
In conclusion, N-Ras drives BLBC by promoting transformation in epithelial cells, which may in turn remodel the tumor microenvironment to create a proinvasive state. Although oncogenic mutations affecting RAS are common in many other human cancers, tumorigenesis in an important subset of breast cancers is driven instead by increasing activity of wild-type N-Ras. Thus, to fully assess the impact of Ras on tumorigenesis, the role of wild-type as well as mutant Ras proteins must be carefully examined.
Citation Format: Zheng Z-Y, Bu W, Tian L, Fan C, Gao X, Zhang X, Yu C, Wang H, Liao Y-H, Li Y, Lewis MT, Edwards D, Zwaka TP, Hilsenbeck SG, Medina D, Perou CM, Creighton CJ, Zhang XH, Chang EC. Wild type N-Ras, overexpressed in basal-like breast cancer, promotes tumor formation by inducing IL8 secretion via JAK2 activation. [abstract]. In: Proceedings of the Thirty-Eighth Annual CTRC-AACR San Antonio Breast Cancer Symposium: 2015 Dec 8-12; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2016;76(4 Suppl):Abstract nr P2-06-11.
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Affiliation(s)
- Z-Y Zheng
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - W Bu
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - L Tian
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - C Fan
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - X Gao
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - X Zhang
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - C Yu
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - H Wang
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - Y-H Liao
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - Y Li
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - MT Lewis
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - D Edwards
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - TP Zwaka
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - SG Hilsenbeck
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - D Medina
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - CM Perou
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - CJ Creighton
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - XH Zhang
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
| | - EC Chang
- Baylor College of Medicine; University of North Carolina-Chapel Hill; National Taiwan University Hospital
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12
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Hein SM, Haricharan S, Johnston AN, Toneff MJ, Reddy JP, Dong J, Bu W, Li Y. Luminal epithelial cells within the mammary gland can produce basal cells upon oncogenic stress. Oncogene 2015; 35:1461-7. [PMID: 26096929 PMCID: PMC4688047 DOI: 10.1038/onc.2015.206] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [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: 10/02/2014] [Revised: 05/04/2015] [Accepted: 05/04/2015] [Indexed: 01/05/2023]
Abstract
In the normal mammary gland, the basal epithelium is known to be bipotent and can generate either basal or luminal cells, whereas the luminal epithelium has not been demonstrated to contribute to the basal compartment in an intact and normally developed mammary gland. It is not clear whether cellular heterogeneity within a breast tumor results from transformation of bipotent basal cells or from transformation and subsequent basal conversion of the more differentiated luminal cells. Here we used a retroviral vector to express an oncogene specifically in a small number of the mammary luminal epithelial cells and tested their potential to produce basal cells during tumorigenesis. This in-vivo lineage-tracing work demonstrates that luminal cells are capable of producing basal cells on activation of either polyoma middle T antigen or ErbB2 signaling. These findings reveal the plasticity of the luminal compartment during tumorigenesis and provide an explanation for cellular heterogeneity within a cancer.
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Affiliation(s)
- S M Hein
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA.,Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, USA
| | - S Haricharan
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, USA
| | - A N Johnston
- Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, USA
| | - M J Toneff
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - J P Reddy
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA
| | - J Dong
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA.,Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, USA
| | - W Bu
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA.,Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, USA
| | - Y Li
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, USA.,Lester and Sue Smith Breast Center, Baylor College of Medicine, Houston, TX, USA
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13
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Xiao Q, Bu W, Ren Y, Qiu J, Xiangpeng Z. PO-1079 Single W18O49 nanowire: a multifunctional nanoplatform for image-guided dose-enhancement radiation therapy. Radiother Oncol 2015. [DOI: 10.1016/s0167-8140(15)41071-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Chen F, Bu W, Cai W, Shi J. Functionalized upconversion nanoparticles: versatile nanoplatforms for translational research. Curr Mol Med 2014; 13:1613-32. [PMID: 24206131 DOI: 10.2174/1566524013666131111122133] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 05/17/2012] [Accepted: 09/10/2013] [Indexed: 11/22/2022]
Abstract
The design, application, and translation of targeted multimodality molecular imaging probes based on nanotechnology have attracted increasing attentions during the last decade and will continue to play vital roles in cancer diagnosis and personalized medicine. With the growing awareness of drawbacks of traditional organic dyes and quantum dots, biocompatible lanthanide ion doped upconversion nanoparticles have emerged as promising candidates for clinically translatable imaging probes, owing to their unique features that are suitable for future targeted multimodal imaging in living subjects. In this review, we summarized the recent advances in the field of functionalized upconversion nanoparticles (f-UCNP) for biological imaging and therapy in vivo, and discussed the future research directions, obstacles ahead, and the potential use of f-UCNP in translational research.
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Affiliation(s)
- F Chen
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, People's Republic of China.
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15
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Abstract
Abstract
Melt blending, extrusion and drawing of polycarbonate (PC) blends containing a thermotropic liquid crystalline polymer (LCP) are reported for a copolyester PCDT synthesised in this laboratory. A single screw extruder is used at four temperatures. The rheology of the PCDT/PC blend, PCDT and PC was measured by means of a capillary rheometer at these temperatures. The morphology of extruded and subsequently drawn strands was studied with the help of a scanning electron microscope and analysed. In PCDT/PC extruded strands, the morphology of the PCDT dispersed phase, changes from spherical through ellipsoidal to elongated with decreasing processing temperature. In contrast to this, in drawn strands with a draw ratio of 10, the morphology of the PCDT changes from ellipsoidal through elongated to fibrillar with increasing processing temperature. It is believed that the relative viscosity of the two phases is the decisive factor determining the microstructure formation of polymer blends containing thermotropic liquid crystalline polymers. Fibril formation is related to the deformation and coalescence of PCDT melt droplets by the drawing at higher temperatures.
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Affiliation(s)
- J. He
- State Key Laboratory of Engineering Plastics, Institute of Chemistry, Academia Sinica, Beijing, China
| | - W. Bu
- State Key Laboratory of Engineering Plastics, Institute of Chemistry, Academia Sinica, Beijing, China
| | - H. Zhang
- State Key Laboratory of Engineering Plastics, Institute of Chemistry, Academia Sinica, Beijing, China
| | - P. Xie
- State Key Laboratory of Engineering Plastics, Institute of Chemistry, Academia Sinica, Beijing, China
| | - X. Xu
- Beijing Research Institute of Chemical Industry, Ministry of Chemical Industry, Beijing, China
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16
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Bu W, Liang D, Liu R, Loll P, Dmochowski I, Eckenhoff R. Interaction of saturated fatty acids with apoferritin. Acta Crystallogr A 2011. [DOI: 10.1107/s0108767311079244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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17
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Pittler J, Bu W, Vaknin D, Travesset A, McGillivray DJ, Lösche M. Charge inversion at minute electrolyte concentrations. Phys Rev Lett 2006; 97:046102. [PMID: 16907594 DOI: 10.1103/physrevlett.97.046102] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2006] [Indexed: 05/11/2023]
Abstract
Anionic dimyristoylphosphatidic acid monolayers spread on LaCl3 solutions reveal strong cation adsorption and a sharp transition to surface overcharging at unexpectedly low bulk salt concentrations. We determine the surface accumulation of La3+ with anomalous x-ray reflectivity and find that La3+ compensates the lipid surface charge by forming a Stern layer with approximately 1 La3+ ion per 3 lipids below a critical bulk concentration, ct approximately 500 nM. Above ct, the surface concentration of La3+ increases to a saturation level with approximately 1 La3+ per lipid, thus implying that the total electric charge of the La3+ exceeds the surface charge. This overcharge is observed at approximately 4 orders of magnitude lower concentration than predicted in ion-ion correlation theories. We suggest that transverse electrostatic correlations between mobile ions and surface charges (interfacial Bjerrum pairing) may contribute to the charge inversion.
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Affiliation(s)
- J Pittler
- Institute of Experimental Physics I, University of Leipzig, D-04103 Leipzig, Germany
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18
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Abstract
The EB1 family proteins are highly conserved microtubule-associated proteins. The EB1 protein in yeast has been shown to play an important role in regulating microtubule dynamics and chromosome segregation. Human EB1 family proteins include EB1, RP1 and EBF3. Although EB1 and RP1 have been shown to associate with microtubules, the subcellular localization of endogenous EBF3 had not been characterized. The function of human EB1 family proteins was also not clear. We therefore investigated the cellular localization of EBF3 and the regulation of microtubule organization by EB1 family proteins. As do EB1 and RP1, EBF3 was found to colocalize with microtubules, preferentially at their plus ends, throughout the cell cycle. Moreover, there was a very strong EBF3 signal at the centrosome in interphase cells and at the spindle poles in mitotic cells. When EB1 family proteins were overexpressed, they associated with the entire microtubule cytoskeleton. In addition, EB1 and EBF3 induced microtubule bundling in some cells overexpressing these proteins. These microtubule bundles were more resistant to nocodazole and were more acetylated than regular microtubules. Our results demonstrate for the first time that human EB1 family proteins could regulate microtubule assembly and stability.
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Affiliation(s)
- W Bu
- Department of Molecular and Cellular Oncology, The University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, Texas, TX 77030, USA
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19
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Bu W, Sun JL, Yang XC. [Cloning, sequence analysis and high-level expression in Escherichia coli and activity assay of pac-1 gene from Schizosaccharmyces pombe]. Sheng Wu Gong Cheng Xue Bao 2001; 17:203-6. [PMID: 11411232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
The Schizosaccharmyces pombe pac-1 gene product is a kind of dsRNA dependent ribonuclease, which has potential to degrade the dsRNA viral genome, the replication form of ssRNA viral genome and viroid genome. Therefore, to introduce the pac-1 gene into plants conferring them resistance to viruses is a new method of establishing the anti-virus transgenic plant. The pac-1 gene from the S. pmobe genome DNA isolated from China was cloned by means of PCR amplification. The pac-1 gene was inserted into the cloning vector pGEM-7Zf(+) by using restriction endonuclease Kpn I/BamHI. Sequencing analysis shows that it is a complete gene with 1095 necleotides. Compared to the reported pac-1 gene, its homology is significant, but with 5 nucleotides differences, leading to only one amino acid difference. Pac-1 gene was inserted into the prodaryotic expression vector pET-21(a) by using the restriction endonuclase Nde I/BamHI. It was induced by the IPTG in E. coli BL21 harbouring the recombinant vector pET-pac-1. The pac-1 gene product is analyzed by the SDS-PAGE. The result shows the product of pac-1 gene exists in the supernatant part as soluble form and in the precipitant part as inclusion bodies after the cells were lysed by ultrasonic wave. The supernatant was applied to detect the enzyme activity of pac-1 gene product. We concluded that pac-1 gene has the biological activity of degrading the CMV-dsRNA.
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Affiliation(s)
- W Bu
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, China
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20
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Bu W, Ye L, Xu Q, Bu X, Yang G, Fan Y. Bis(μ-azido-κ N1:κ N1)bis{[2-(1,5-diazacyclooct-1-yl-κ 2N, N'-methyl)phenolato-κ O]copper(II)}. Acta Crystallogr C 1999. [DOI: 10.1107/s0108270199099515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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21
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Bu W, Ye L, Zhu H, Yang G, Fan Y, Tang W. μ-1,3-Imidazolyl-κ N:κ N'-bis[(diethylenetriaminato-κ 3N)copper] triperchlorate hydrate. Acta Crystallogr C 1999. [DOI: 10.1107/s0108270199099527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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23
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Qin LX, Tang ZY, Li XM, Bu W, Xia JL. Effect of antiangiogenic agents on experimental animal models of hepatocellular carcinoma. Ann Acad Med Singap 1999; 28:147-51. [PMID: 10374041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
A new therapeutic strategy for treating metastasis in hepatocellular carcinoma (HCC) has entailed the use of antiangiogenic agents such as suramin, BB-94 (Batimastat), TNP-470, and carboxyamido-triazole (CAI, a synthetic inhibitor of non-excitable calcium channels that reversibly inhibits angiogenesis). These agents have been used to treat metastatic model of HCC in nude mouse (LCI-D20 mouse model). The results of these studies are summarized in this paper with emphasis on the inhibitory effects of the drugs on tumour growth, angiogenesis, invasion and metastasis in LCI-D20 mouse models. The results suggest that all of the agents used can significantly inhibit tumour growth, angiogenesis, invasion and metastasis of human HCC in nude mouse models, and may be candidates for the control of recurrence and metastasis after HCC resection.
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Affiliation(s)
- L X Qin
- Liver Cancer Institute, Zhongshan Hospital, Shanghai Medical University, PR China
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24
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Bu W, Tang ZY, Sun FX, Ye SL, Liu KD, Xue Q, Chen J, Gao DM. Effects of matrix metalloproteinase inhibitor BB-94 on liver cancer growth and metastasis in a patient-like orthotopic model LCI-D20. Hepatogastroenterology 1998; 45:1056-61. [PMID: 9756006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND/AIMS The aim of this study was to try to understand the effects of the synthetic matrix metalloproteinase inhibitor Batimastat (BB-94) on hepatocellular carcinoma (HCC). METHODOLOGY An orthotopic metastatic human hepatocellular carcinoma in nude mice model (LCI-D20) was used to study primary tumor growth, local invasion and metastasis of HCC. MTT assay was used to study the effects of BB-94 on cytotoxin and proliferation of HCC cell line SMMC-7721 in vitro. A gelatine zymograph was used to study the expression of MMPs in the LCI-D20 tumor tissue. RESULTS BB-94 can inhibit primary tumor growth, local invasion, intrahepatic and lung metastasis, as well as prolong survival. BB-94 did not affect the proliferation of HCC cells in vitro. LCI-D20 tumor tissue expresses MMP-2 and MMP-9. CONCLUSIONS BB-94 has a cytostatic therapeutic effect on HCC.
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Affiliation(s)
- W Bu
- Liver Cancer Institute, Zhongshan Hospital, Shanghai Medical University, PR China
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25
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Bu W, Huang X, Tang Z. [The role of MMP-2 in the invasion and metastasis of hepatocellular carcinoma (HCC)]. Zhonghua Yi Xue Za Zhi 1997; 77:661-4. [PMID: 9772533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
OBJECTIVES To get insights into the role of MMP-2 in the invasion and metastasis of hepatocellular carcinoma (HCC), and to find a method to judge the invasion and metastasis of HCC through MMP-2. METHODS Zymograph and immunohistochemistry were used to study the content and types of positive cells of MMP-2 in the HCC, and statistical methods were used to analyse the association between the content of MMP-2 and the pathological indexes of HCC. RESULTS MMP-2 was expressed by all the normal liver, HCC and surrounding liver parenchyma. The increase of MMP-2 and the presence of the active type of MMP-2 were related to the invasion and metastasis of HCC. The content of MMP-2 in HCC being higher than that in surrounding liver parenchyma was an important index to judge the invasion and metastasis of the HCC. The positive cells of MMP-2 found in immunohistochemistry were normal hepatocytes, cholangioepithelial cells, Ito cells, regenerated hepatocytes, new generated cholangioepithelial cells, and HCC cells. CONCLUSION MMP-2 was related to the invasion and me astasis of HCC. The content of MMP-2 in HCC being higher than that in surrounding liver parenchyma could be bused as an important index to judge the invasion and metastasis of HCC.
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Affiliation(s)
- W Bu
- Liver Cancer Institute and Zhongshan Hospital, Shanghai Medical University
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27
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Xu Y, Bu W, Li B. Metabolic factors capable of inducing Agrobacterium vir gene expression are present in rice (Oryza sativa L.). Plant Cell Rep 1993; 12:160-164. [PMID: 24196854 DOI: 10.1007/bf00239098] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/1992] [Revised: 09/11/1992] [Indexed: 06/02/2023]
Abstract
The effects of exudates and extracts from suspension cultures or various parts of rice (Oryza sativa L.) plants on induction of vir (virulence) gene expression in Agrobacterium tumefaciens were examined. Only leaf extracts from panicle-differentiating plants to flowering plants were able to strongly induce activation and expression of vir genes. This induction was similar to that observed with 2 μM acetosyringone (AS), yet there was no synergy between AS and rice extracts. Responses to vir-inducing metabolites and signal molecules were different among various vir loci. These results demonstrate that one or more inducing factors for vir gene expression are also present in rice, but only in specific parts and developmental stages.
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Affiliation(s)
- Y Xu
- Biotechnology Research Center, Zhongshan University, 510275, Guanzhou, China
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