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Zhao X, Duan B, Wu J, Huang L, Dai S, Ding J, Sun M, Lin X, Jiang Y, Sun T, Lu R, Huang H, Lin G, Chen R, Yao Q, Kou L. Bilirubin ameliorates osteoarthritis via activating Nrf2/HO-1 pathway and suppressing NF-κB signalling. J Cell Mol Med 2024; 28:e18173. [PMID: 38494841 PMCID: PMC10945086 DOI: 10.1111/jcmm.18173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 01/08/2024] [Accepted: 01/31/2024] [Indexed: 03/19/2024] Open
Abstract
Osteoarthritis (OA) is a chronic degenerative joint disease that affects worldwide. Oxidative stress plays a critical role in the chronic inflammation and OA progression. Scavenging overproduced reactive oxygen species (ROS) could be rational strategy for OA treatment. Bilirubin (BR) is a potent endogenous antioxidant that can scavenge various ROS and also exhibit anti-inflammatory effects. However, whether BR could exert protection on chondrocytes for OA treatment has not yet been elucidated. Here, chondrocytes were exposed to hydrogen peroxide with or without BR treatment. The cell viability was assessed, and the intracellular ROS, inflammation cytokines were monitored to indicate the state of chondrocytes. In addition, BR was also tested on LPS-treated Raw264.7 cells to test the anti-inflammation property. An in vitro bimimic OA microenvironment was constructed by LPS-treated Raw264.7 and chondrocytes, and BR also exert certain protection for chondrocytes by activating Nrf2/HO-1 pathway and suppressing NF-κB signalling. An ACLT-induced OA model was constructed to test the in vivo therapeutic efficacy of BR. Compared to the clinical used HA, BR significantly reduced cartilage degeneration and delayed OA progression. Overall, our data shows that BR has a protective effect on chondrocytes and can delay OA progression caused by oxidative stress.
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Affiliation(s)
- Xinyu Zhao
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Key Laboratory of Structural Malformations in Children of Zhejiang ProvinceWenzhouChina
| | - Baiqun Duan
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Key Laboratory of Structural Malformations in Children of Zhejiang ProvinceWenzhouChina
| | - Jianing Wu
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Key Laboratory of Structural Malformations in Children of Zhejiang ProvinceWenzhouChina
| | - Lihui Huang
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Key Laboratory of Structural Malformations in Children of Zhejiang ProvinceWenzhouChina
| | - Sheng Dai
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Key Laboratory of Structural Malformations in Children of Zhejiang ProvinceWenzhouChina
| | - Jie Ding
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Key Laboratory of Structural Malformations in Children of Zhejiang ProvinceWenzhouChina
| | - Meng Sun
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Key Laboratory of Structural Malformations in Children of Zhejiang ProvinceWenzhouChina
| | - Xinlu Lin
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
| | - Yiling Jiang
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
| | - Tuyue Sun
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
| | - Ruijie Lu
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
| | - Huirong Huang
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy TechnologyWenzhouChina
- School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouChina
| | - Guangyong Lin
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
| | - Ruijie Chen
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Key Laboratory of Structural Malformations in Children of Zhejiang ProvinceWenzhouChina
- Zhejiang‐Hong Kong Precision Theranostics of Thoracic Tumors Joint LaboratoryWenzhouChina
| | - Qing Yao
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- School of Pharmaceutical SciencesWenzhou Medical UniversityWenzhouChina
| | - Longfa Kou
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of PharmacyThe Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical UniversityWenzhouChina
- Key Laboratory of Structural Malformations in Children of Zhejiang ProvinceWenzhouChina
- Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy TechnologyWenzhouChina
- Zhejiang‐Hong Kong Precision Theranostics of Thoracic Tumors Joint LaboratoryWenzhouChina
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Ouyang F, Wu Q, Duan B, Yuan X, Wang B, Chen Y, Yin M, Zeng X. Diagnosis of spinal dural arteriovenous fistula: a multimodal MRI assessment strategy. Clin Radiol 2023; 78:e958-e965. [PMID: 37821323 DOI: 10.1016/j.crad.2023.08.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 07/11/2023] [Accepted: 08/31/2023] [Indexed: 10/13/2023]
Abstract
AIM To identify more specific screening indicators at magnetic resonance imaging (MRI) for the diagnosis of spinal dural arteriovenous fistulas (SDAVFs) and to determine an efficient diagnostic strategy. MATERIALS AND METHODS This retrospective study analysed clinical and imaging data of patients diagnosed with SDAVF and alternative myelopathy who underwent conventional MRI examinations. Additionally, three-dimensional (3D) T2-weighted sampling perfection with application-optimised contrasts using different flip-angle evolutions (3D-T2-SPACE) and contrast-enhanced magnetic resonance angiography (CE-MRA) data from patients with SDAVF were compared with digital subtraction angiography (DSA) data. RESULTS The age of onset, perimedullary flow voids (PFV), distribution of lesions, syringomyelia, degree of spinal oedema, and cauda equina disorder (CED) were factors that showed statistically significance in the identification of SDAVF with alternative myelopathy. After controlling for age, gender, PFV, degree of spinal cord swelling, and syringomyelia, the multivariable ordinal logistic regression model showed that the CED sign (OR = 32.46; 95% confidence interval [CI]: 2.47-427.15; p=0.008) was an independent predictor for SDAVF. The diagnostic model constructed using the PFV and CED signs had better diagnostic performance, with an area under the curve of 0.957 (p<0.001), maximum Youden index of 0.844, sensitivity of 92.9%, and specificity of 91.5%. Both 3D-T2-SPACE (77.8%) and CE-MRA (83.3%) sequences had good localisation values for SDAVF. Combining the two imaging examinations had better diagnostic accuracy than that of DSA. CONCLUSION CED and PFV on conventional MRI were specific indicators for the diagnosis of SDAVF. To compensate for the lack of fistula localisation on conventional MRI, 3D-T2-SPACE and CE-MRA can be used. Together they complement each other and have good diagnostic potential.
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Affiliation(s)
- F Ouyang
- Department of Radiology, The First Affiliated Hospital of Nanchang University, 330006 Nanchang, Jiangxi, China
| | - Q Wu
- Department of Radiology, The First Affiliated Hospital of Nanchang University, 330006 Nanchang, Jiangxi, China
| | - B Duan
- Class 211, Innovation Experiment, Nanchang University, 330031 Nanchang, Jiangxi, China
| | - X Yuan
- Department of Radiology, The First Affiliated Hospital of Nanchang University, 330006 Nanchang, Jiangxi, China
| | - B Wang
- Department of Radiology, The First Affiliated Hospital of Nanchang University, 330006 Nanchang, Jiangxi, China
| | - Y Chen
- Department of Radiology, The First Affiliated Hospital of Nanchang University, 330006 Nanchang, Jiangxi, China
| | - M Yin
- Department of Radiology, The First Affiliated Hospital of Nanchang University, 330006 Nanchang, Jiangxi, China
| | - X Zeng
- Department of Radiology, The First Affiliated Hospital of Nanchang University, 330006 Nanchang, Jiangxi, China.
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Chen XQ, Zhang S, Gou X, Zeng N, Duan B, Wang H, Dai J, Shen K, Zhong R, Tian R, Chen N, Yan D. Tumor Treatment Response Assessed During the Concurrent Chemoradiotherapy for Nasopharyngeal Patients. Int J Radiat Oncol Biol Phys 2023; 117:e652-e653. [PMID: 37785939 DOI: 10.1016/j.ijrobp.2023.06.2078] [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: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) To evaluate intratumoral treatment response distribution with using FDG-PET/CT during the chemoradiotherapy of nasopharyngeal patients (NPC). MATERIALS/METHODS A total of 5 of 30 patients with stage III-IVA NPC were enrolled in the institutional protocol for induction/concurrent chemoradiotherapy with radiation dose of 70 Gy in 33 fractions. For each patient, a pre-radiation treatment FDG-PET/MRI image (SUV0) and a mid-treatment image (SUVm) at the treatment dose of 31.8 Gy were obtained. Followed by deformable PET/MRI registration between SUV0 and SUVm, the tumor voxel SUV reduction ratio was obtained to construct a tumor dose response matrix (DRM). Tumor SUVavid was also constructed by limiting tumor voxel SUVm > a given value. Spatial correlations of the tumor SUV0, SUVm, SUVavid and DRM were determined. RESULTS The mean and coefficient variation (CV) of the SUV0, SUVm and DRM for all tumors were 5.05 (52%), 2.72 (49%) and 0.64 (63%) (Table contains the individual data), which were smaller than those on the SUVs of head-n-neck HPV+ patients reported previously due to the induction chemotherapy, but had much larger DRM mean and CV. The inter-tumoral CVs of SUV0 and DRM were 29% and 27%, which were much lower than those of the intra-tumoral CVs 43% and 57%. Meanwhile, the intra-tumoral variations on SUV0 was smaller than the one of head-neck HPV+ patients, but the DRM intra-variation was much larger. There was a weak correlation between SUV0 and SUVm with the correlation coefficient 0.13, a medium correlation of -0.55 between SUV0 and DRM, but a strong correlation, 0.72, between SUVm and DRM. However, the spatial correlation between tumor DRM and SUVavid was getting weaker as the SUVavid value increasing and equal 0.47 with SUVavid value > 3. CONCLUSION The spatial dose response DRM for NPC in the concurrent chemoradiotherapy was relatively high, while had relatively low baseline tumor metabolic activity SUV0. It was most likely due to the induction chemotherapy. In addition, the tumor dose response showed vary large intra-tumoral variation. The high correlations between DRM and SUVm imply that SUVavid could be used partially to guide adaptive modification of NPC treatment with carefully selected boundary value.
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Affiliation(s)
- X Q Chen
- Radiotherapy Physics and Technology Center, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - S Zhang
- Department of Head and Neck Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - X Gou
- Radiotherapy Physics and Technology Center, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - N Zeng
- Department of Head and Neck Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - B Duan
- Department of Head and Neck Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - H Wang
- Department of Nuclear Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - J Dai
- Department of Nuclear Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - K Shen
- Radiotherapy Physics and Technology Center, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - R Zhong
- Radiotherapy Physics and Technology Center, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - R Tian
- Department of Nuclear Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - N Chen
- Department of Head and Neck Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - D Yan
- Radiotherapy Physics and Technology Center, Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China; Beaumont Health, Royal Oak, MI
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Chen Z, Chen H, Huang L, Duan B, Dai S, Cai W, Sun M, Jiang Z, Lu R, Jiang Y, Jiang X, Zheng H, Yao Q, Kim K, Lin G, Xie C, Chu M, Chen R, Kou L. ATB 0,+-targeted nanoparticles initiate autophagy suppression to overcome chemoresistance for enhanced colorectal cancer therapy. Int J Pharm 2023:123082. [PMID: 37244464 DOI: 10.1016/j.ijpharm.2023.123082] [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: 01/19/2023] [Revised: 05/13/2023] [Accepted: 05/23/2023] [Indexed: 05/29/2023]
Abstract
Oxaliplatin (OXA) resistance remains the major obstacle to the successful chemotherapy of colorectal cancer (CRC). As a self-protection mechanism, autophagy may contribute to tumor drug resistance, therefore autophagy suppression could be regarded as a possible treatment option in chemotherapy. Cancer cells, especially drug-resistant tumor cells, increase their demand for specific amino acids by expanding exogenous supply and up-regulating de novo synthesis, to meet the needs for excessive proliferation. Therefore, it is possible to inhibit cancer cell proliferation through pharmacologically blocking the entry of amino acid into cancer cells. SLC6A14 (ATB0, +) is an essential amino acid transporter, that is often abnormally up-regulated in most cancer cells. Herein, in this study, we designed oxaliplatin/berbamine-coloaded, ATB0,+-targeted nanoparticles ((O+B)@Trp-NPs) to therapeutically target SLC6A14 (ATB0, +) and inhibit cancer proliferation. The (O+B)@Trp-NPs utilize the surface-modified tryptophan to achieve SLC6A14-targeted delivery of Berbamine (BBM), a compound that is found in a number of plants used in traditional Chinese medicine, which could suppress autolysosome formation though impairing autophagosome-lysosome fusion. We verified the feasibility of this strategy to overcome the OXA resistance during colorectal cancer treatment. The (O+B)@Trp-NPs significantly inhibited the proliferation and decreased the drug resistance of resistant colorectal cancer cells. In vivo, (O+B)@Trp-NPs greatly suppressed the tumor growth in tumor-bearing mice, which is consistent with the in vitro data. This research offers a unique and promising chemotherapeutic treatment for colorectal cancer.
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Affiliation(s)
- Zhiwei Chen
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China; Wenzhou key Laboratory of basic science and translational research of radiation oncology, Wenzhou 325027, China; Zhejiang-Hong Kong Precision Theranostics of Thoracic Tumors Joint Laboratory, Wenzhou 325000, China; School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China; College of Pharmacy and Research Institute of Pharmaceutical Sciences, Chonnam National University, Gwangju 61186, Korea
| | - Heyan Chen
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China; Wenzhou key Laboratory of basic science and translational research of radiation oncology, Wenzhou 325027, China; Zhejiang-Hong Kong Precision Theranostics of Thoracic Tumors Joint Laboratory, Wenzhou 325000, China
| | - Lihui Huang
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China
| | - Baiqun Duan
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China
| | - Sheng Dai
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou 325027, China
| | - Wenjing Cai
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou 325027, China
| | - Meng Sun
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou 325027, China
| | - Zhikai Jiang
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China
| | - Ruijie Lu
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China
| | - Yiling Jiang
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China
| | - Xinyu Jiang
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China
| | - Hailun Zheng
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China
| | - Qing Yao
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Kwonseop Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Chonnam National University, Gwangju 61186, Korea
| | - Guangyong Lin
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou 325027, China.
| | - Congying Xie
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China; Wenzhou key Laboratory of basic science and translational research of radiation oncology, Wenzhou 325027, China; Zhejiang-Hong Kong Precision Theranostics of Thoracic Tumors Joint Laboratory, Wenzhou 325000, China.
| | - Maoping Chu
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou 325027, China.
| | - Ruijie Chen
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou 325027, China
| | - Longfa Kou
- Wenzhou Municipal Key Laboratory of Pediatric Pharmacy, Department of Pharmacy, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou 325027, China; Key Laboratory of Structural Malformations in Children of Zhejiang Province, Wenzhou 325027, China; Zhejiang Engineering Research Center for Innovation and Application of Intelligent Radiotherapy Technology, Wenzhou 325000, China; Wenzhou key Laboratory of basic science and translational research of radiation oncology, Wenzhou 325027, China; Zhejiang-Hong Kong Precision Theranostics of Thoracic Tumors Joint Laboratory, Wenzhou 325000, China.
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Duan B, Ni YH, Dai YQ, Xu ZM. [Clinical evaluation of vocal fold paralysis in 207 children]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2018; 53:847-850. [PMID: 30453405 DOI: 10.3760/cma.j.issn.1673-0860.2018.11.010] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the etiology and clinical characteristics of vocal fold paralysis in children. To provide useful information for diagnosis, management and prognosis in the clinical work. Methods: Two hundred and seven children with vocal fold paralysis in Children's Hospital of Fudan University were retrospectively studied, and followed-up. Results: All the patients had hoarseness.151 cases had vocal paralysis in the left side and the main etiology was pulmonary arterial hypertension.43 cases had bilateral vocal paralysis and all of them had respiratory problems.The main etiology were congenital tracheoesophageal malformations.13 cases had vocal paralysis in the right side.In terms of etiology, 8 cases were related to intracranial lesions, 2 cases were idiopathic. Conclusions: The main etiologies of left vocal fold paralysis were cardiovascular diseases, and bilateral vocal paralysis were congenital tracheoesophageal malformations.The main etiologies of right vocal fold paralysis were neoplastic and central lesion.The prognosis of bilateral vocal fold paralysis and right vocal fold paralysis was poor.
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Affiliation(s)
- B Duan
- Department of Otorhinolaryngology Head and Neck Surgery, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Y H Ni
- Department of Otorhinolaryngology Head and Neck Surgery, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Y Q Dai
- Department of Otorhinolaryngology Head and Neck Surgery, Children's Hospital of Fudan University, Shanghai 201102, China
| | - Z M Xu
- Department of Otorhinolaryngology Head and Neck Surgery, Children's Hospital of Fudan University, Shanghai 201102, China
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Zou Y, Tang Z, Ahn W, Duan B, Wang Y, Zhou W, Guo Q, Huang C. Increase in regional oxygen saturation in the thigh indicates successful block of the femoral nerve after lumbar plexus block. Br J Anaesth 2018; 121:973-974. [DOI: 10.1016/j.bja.2018.03.036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 03/20/2018] [Accepted: 05/02/2018] [Indexed: 11/28/2022] Open
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Duan B, Chen B, Huang HC, Liu RF, Wang HQ, Zheng JX, Zeng YK, Xing JC. [Clinical research about needle-tract assisted standard percutaneous nephrolithotomy for the treatment of complicated upper urinary tract calculi]. Zhonghua Wai Ke Za Zhi 2018; 56:768-771. [PMID: 30369159 DOI: 10.3760/cma.j.issn.0529-5815.2018.10.013] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the safety and efficacy of needle-tract assisted standard percutaneous nephrolithotomy (PCNL) for the treatment of complicated upper urinary tract calculi. Methods: The clinical data of 1 562 patients with complicated upper urinary calculi who received standard PCNL from December 2013 to December 2017 at Department of Urology, the First Affiliated Hospital of Xiamen University were retrospectively analyzed. There were large residual stones in 256 patients through B-ultrasound exploration after standard PCNL, could't be detected with nephoscope in standard PCNL tracts. 16 F mini PCNL tract were established in 120 cases for treatment of residual stones, while needle-tract were established in order to guide nephroscope to find residual stones in 126 cases. Needle-tract were transferred to 16 F mini PCNL tract for treatment of residual stones in 10 patients if these residual stones could't be detected through needle-tract. Operation time, change of hemoglobin level after operation, incidence of postoperative complications, time of hospitalization and rate of stone clearance were measured in two groups. The statistical methods used included t test, Wilcoxon rank sum test, and χ2 test. Results: There were 1 to 3 mini tracts (M(QR): 1(1)) established in the mini tracts group and 1 to 7 needle-tracts (M(QR): 3(2)) established in the needle-tract group (Z=-10.57, P=0.000). Compared with mini tract group, the operation time ((62.0±18.0) minutes vs. (84.0±15.5) minutes, t=10.242, P=0.000), hospitalization time ((4.40±0.86) days vs. (5.20±0.81) days, t=7.570, P=0.049), hemoglobin dropped ((1.31±0.47) g/L vs. (2.74±0.63) g/L, t=20.12, P=0.000), and incidence of postoperative complications (7.9% (10/126) vs. 19.2% (23/120), χ2=6.674, P=0.01) of needle-tract group were lower, while postoperative stone clearance rate was higher (89.7% vs. 76.7%, χ2=7.497, P=0.006). No perioperative severe complications such as pleural injury, pneumatothorax, perforation of renal, trauma of abdominal organ occurred in two groups. Conclusion: Needle-tract assisted standard PCNL for the treatment of complicated upper urinary calculi can significantly improve stone clearance rate, reduce operation time, decrease risk of kidney and surrounding organs damage.
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Affiliation(s)
- B Duan
- Department of Urology, the First Affiliated Hospital of Xiamen University, Xiamen 361003, China
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Dai F, Xiang X, Duan G, Duan B, Xiao X, Chang H. Pathogenicity characteristics of Enterococcus faecium from diseased black bears. Iran J Vet Res 2018; 19:82-86. [PMID: 30046317 PMCID: PMC6056144] [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] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 10/25/2017] [Accepted: 12/23/2017] [Indexed: 06/08/2023]
Abstract
The death of several black bears at the black bear breeding base in Yunnan Pingbian Daweishan is a matter of concern. Multiple black bears exhibited decreased appetite or unusual waste, and some were soporific or suffered from vomiting and anhelation. In order to ascertain the cause of death, 16S rDNA gene sequencing and phylogenetic analysis was performed on bacteria isolated from tissue samples obtained from dead bears. The biochemical characteristics of the isolated bacteria were subsequently analyzed using different biochemical test systems. The bacteria can decompose glucose, but it cannot produce gas. The fermentation study of sucrose, lactose, trehalose, glycerol and mannitol yielded positive results; while it was unable to decompose urea or ODC (ornithine decarboxylase). Basic Local Alignment Search Tool (BLAST) analysis of a ~1500-bp DNA product amplified from the 16S rDNA of the bacterial isolate revealed that Enterococcus faecium from black bears is highly similar to other E. faecium isolates in the National Center for Biotechnology Information (NCBI) database, and the highest sequence similarity (99%) was with the reference strain. In addition, mice infected with the E. faecium isolate succumbed to severe damage to the lungs, liver, spleen, myocardium, and kidney tissues. In summary, the isolated E. faecium from dead black bears induced pathological changes in mice.
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Affiliation(s)
- F. Dai
- Department of Clinical Veterinary, College of Veterinary Medicine, Yunnan Agricultural University, Kunming, Yunnan, 650201, China
- These authors contributed equally to this work and should all be considered as first authors
| | - X. Xiang
- Department of Clinical Veterinary, College of Veterinary Medicine, Yunnan Agricultural University, Kunming, Yunnan, 650201, China
- These authors contributed equally to this work and should all be considered as first authors
| | - G. Duan
- Department of Clinical Veterinary, College of Veterinary Medicine, Yunnan Agricultural University, Kunming, Yunnan, 650201, China
- These authors contributed equally to this work and should all be considered as first authors
| | - B. Duan
- Animal Disease Prevention and Control Center of Yunnan Province, Kunming, Yunnan, 650201, China
| | - X. Xiao
- Department of Clinical Veterinary, College of Veterinary Medicine, Yunnan Agricultural University, Kunming, Yunnan, 650201, China
| | - H. Chang
- Department of Clinical Veterinary, College of Veterinary Medicine, Yunnan Agricultural University, Kunming, Yunnan, 650201, China
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9
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Yang X, Duan B, Zhou X. Long non-coding RNA FOXD2-AS1 functions as a tumor promoter in colorectal cancer by regulating EMT and Notch signaling pathway. Eur Rev Med Pharmacol Sci 2017; 21:3586-3591. [PMID: 28925486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OBJECTIVE A growing number of long noncoding RNAs (lncRNAs) are emerging as new modulators in cancer origination and progression. However, the functions and molecular mechanisms of lncRNAs to colorectal cancer (CRC) are still largely unknown. The aim of this study was to investigate the function and role of lncRNA FOXD2-AS1 (FOXD2-AS1) in human CRC. PATIENTS AND METHODS The expression of FOXD2-AS1 was investigated using Real-time reverse transcription-polymerase chain reaction (qRT-PCR) in 45 CRC specimens and matched adjacent normal tissues and CRC cell lines. MTT assays were conducted to explore the impact of FOXD2-AS1 knockdown on the proliferation of human CRC cells. The effects of FOXD2-AS1 on CRC cell migration and invasion were evaluated by cell invasion assays and migration assays. Western blot analysis was used to determine the expression levels of EMT-related and Notch-related proteins. RESULTS The results showed that FOXD2-AS1 expression was significantly increased in CRC tissues as well as in CRC cell lines. Moreover, down-regulation of FOXD2-AS1 suppressed cell, proliferation, invasion and migration in vitro. Importantly, we further confirmed that EMT and the Notch signaling pathway were inactivated in CRC cells after FOXD2-AS1 knockdown. CONCLUSIONS FOXD2-AS1 promoted the progression of CRC by regulating EMT and Notch signaling pathway. Thus, targeting FOXD2-AS1 may be an effective strategy for CRC treatment.
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Affiliation(s)
- X Yang
- Department of Pathophysiology, Basic Medical Science, Shanxi Medical University, Taiyuan, Shanxi, China.
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10
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Xu HX, Liang LM, Zheng JS, Duan B, Chen GL, Zhang ZH, Wang J. [A case of hereditary hemochromatosis]. Zhonghua Gan Zang Bing Za Zhi 2017; 25:541-543. [PMID: 29055997 DOI: 10.3760/cma.j.issn.1007-3418.2017.07.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Affiliation(s)
- H X Xu
- Department of Infection Diseases, The Third Affiliated Hospital, Anhui Medical University, Hefei 230061, China
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11
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Duan B, Kapetanovic E, Hockaday LA, Butcher JT. Three-dimensional printed trileaflet valve conduits using biological hydrogels and human valve interstitial cells. Acta Biomater 2014; 10:1836-46. [PMID: 24334142 DOI: 10.1016/j.actbio.2013.12.005] [Citation(s) in RCA: 234] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2013] [Revised: 11/20/2013] [Accepted: 12/05/2013] [Indexed: 12/20/2022]
Abstract
Tissue engineering has great potential to provide a functional de novo living valve replacement, capable of integration with host tissue and growth. Among various valve conduit fabrication techniques, three-dimensional (3-D) bioprinting enables deposition of cells and hydrogels into 3-D constructs with anatomical geometry and heterogeneous mechanical properties. Successful translation of this approach, however, is constrained by the dearth of printable and biocompatible hydrogel materials. Furthermore, it is not known how human valve cells respond to these printed environments. In this study, 3-D printable formulations of hybrid hydrogels are developed, based on methacrylated hyaluronic acid (Me-HA) and methacrylated gelatin (Me-Gel), and used to bioprint heart valve conduits containing encapsulated human aortic valvular interstitial cells (HAVIC). Increasing Me-Gel concentration resulted in lower stiffness and higher viscosity, facilitated cell spreading, and better maintained HAVIC fibroblastic phenotype. Bioprinting accuracy was dependent upon the relative concentrations of Me-Gel and Me-HA, but when optimized enabled the fabrication of a trileaflet valve shape accurate to the original design. HAVIC encapsulated within bioprinted heart valves maintained high viability, and remodeled the initial matrix by depositing collagen and glyosaminoglycans. These findings represent the first rational design of bioprinted trileaflet valve hydrogels that regulate encapsulated human VIC behavior. The use of anatomically accurate living valve scaffolds through bioprinting may accelerate understanding of physiological valve cell interactions and progress towards de novo living valve replacements.
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Affiliation(s)
- B Duan
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - E Kapetanovic
- College of Human Ecology, Cornell University, Ithaca, NY, USA
| | - L A Hockaday
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA
| | - J T Butcher
- Department of Biomedical Engineering, Cornell University, Ithaca, NY 14853, USA.
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12
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Hockaday LA, Kang KH, Colangelo NW, Cheung PYC, Duan B, Malone E, Wu J, Girardi LN, Bonassar LJ, Lipson H, Chu CC, Butcher JT. Rapid 3D printing of anatomically accurate and mechanically heterogeneous aortic valve hydrogel scaffolds. Biofabrication 2012; 4:035005. [PMID: 22914604 DOI: 10.1088/1758-5082/4/3/035005] [Citation(s) in RCA: 367] [Impact Index Per Article: 30.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The aortic valve exhibits complex three-dimensional (3D) anatomy and heterogeneity essential for the long-term efficient biomechanical function. These are, however, challenging to mimic in de novo engineered living tissue valve strategies. We present a novel simultaneous 3D printing/photocrosslinking technique for rapidly engineering complex, heterogeneous aortic valve scaffolds. Native anatomic and axisymmetric aortic valve geometries (root wall and tri-leaflets) with 12-22 mm inner diameters (ID) were 3D printed with poly-ethylene glycol-diacrylate (PEG-DA) hydrogels (700 or 8000 MW) supplemented with alginate. 3D printing geometric accuracy was quantified and compared using Micro-CT. Porcine aortic valve interstitial cells (PAVIC) seeded scaffolds were cultured for up to 21 days. Results showed that blended PEG-DA scaffolds could achieve over tenfold range in elastic modulus (5.3±0.9 to 74.6±1.5 kPa). 3D printing times for valve conduits with mechanically contrasting hydrogels were optimized to 14 to 45 min, increasing linearly with conduit diameter. Larger printed valves had greater shape fidelity (93.3±2.6, 85.1±2.0 and 73.3±5.2% for 22, 17 and 12 mm ID porcine valves; 89.1±4.0, 84.1±5.6 and 66.6±5.2% for simplified valves). PAVIC seeded scaffolds maintained near 100% viability over 21 days. These results demonstrate that 3D hydrogel printing with controlled photocrosslinking can rapidly fabricate anatomical heterogeneous valve conduits that support cell engraftment.
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Affiliation(s)
- L A Hockaday
- Department of Biomedical Engineering, Cornell University, Ithaca, NY, USA
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13
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Liu H, Chen G, Huang Y, Duan B, Han L, Xu Z, Zhang Y, Gao X, Li Y. P065 Proteomic Analysis of High-Density Lipoprotein in Chinese Patients with Coronary Heart Disease using Two-dimensional Difference Gel Electrophoresis. Int J Cardiol 2011. [DOI: 10.1016/s0167-5273(11)70089-4] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Yeboah MM, Xue X, Duan B, Ochani M, Tracey KJ, Susin M, Metz CN. Cholinergic agonists attenuate renal ischemia-reperfusion injury in rats. Kidney Int 2008; 74:62-9. [PMID: 18401335 DOI: 10.1038/ki.2008.94] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Inflammation plays a significant role in the pathophysiology of renal ischemia-reperfusion injury. Local inflammation is modulated by the brain via the vagus nerve and nicotinic acetylcholine receptors such that electrical or pharmacologic stimulation of this cholinergic anti-inflammatory pathway results in suppression of proinflammatory cytokine production. We examined the effects of cholinergic stimulation using agonists, nicotine or GTS-21, given before or after bilateral renal ischemia-reperfusion injury in rats. Pretreatment of rats with either agonist significantly attenuated renal dysfunction and tubular necrosis induced by renal ischemia. Similarly, tumor necrosis factor-alpha protein expression and leukocyte infiltration of the kidney were markedly reduced following treatment with cholinergic agonists. We found functional nicotinic acetylcholine receptors were present on rat proximal tubule epithelial cells. Cholinergic stimulation significantly decreased tubular necrosis in vagotomized rats after injury, implying an intact vagus nerve is not required for this renoprotective effect.
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Affiliation(s)
- M M Yeboah
- Laboratory of Medicinal Biochemistry, The Feinstein Institute for Medical Research, North Shore-LIJ Health System, Manhasset, New York 11030, USA
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15
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Chen S, Duan B. Treatment of spontaneous coronary artery dissection: report of two cases. Chin Med J (Engl) 2000; 113:1150-2. [PMID: 11776156] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Affiliation(s)
- S Chen
- Department of Medicine, Nanjing First Hospital, Nanjing 210006, China
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16
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Duan B, Li G, Li C, Bo L, Li Y, Ren Q, Ren C. [The development of a hemorrhologity observating and measuring instrument]. Zhongguo Yi Liao Qi Xie Za Zhi 1999; 23:204-224. [PMID: 12583062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A new instrument for observing blood cell state and the process of variation on hemorrheology has been developed. There are three ways of shear rate: setting by hand, automatically setting and simulating pulsative state. It can provide different variable flow fields. The shear rate can be set in the range from 0.1 to 1000 s-1. It needs only a little blood. It can be easyly and rapidely operated. it has clear images. The hemorrheology state of blood cells can be directly perceived through thd instrument by eyes. The display and measurement and record of blood cell's hemorrheology state can be finished in real time dynamically and simultaneously.
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Affiliation(s)
- B Duan
- Institute of Biomedical Engineering and Institute of Hematology, Chinese Academy of Medical Science
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17
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Duan B, Li Y, Ren C. [The development of a multifunction shear flow field generating device]. Zhongguo Yi Liao Qi Xie Za Zhi 1997; 21:198-200. [PMID: 11189253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A new shear flow field generating device has been developed. It can be widely used in the basic research of hemorheology, clinical test and measurement. It has rich functions and can make dynamic measurement of hemorheology parameters. There are three work ways of shear rate: setting by hand, automatically setting and simulating pulsative state. It can provide different variable flow fields. The shear rate can be set in the range from 0.1 to 1000 s-1.
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Affiliation(s)
- B Duan
- Institute of Biomedical Engineering, Chineses Academy of Medical Sciences, Peking Union Medical College
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18
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Duan B, Li Y, Chen X, Lin Z. [The research and design of a constant flow pump for clinical ultrasonic emulsification]. Zhongguo Yi Liao Qi Xie Za Zhi 1997; 21:39-41. [PMID: 9644142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A constant flow pump for clinical ultrasonic emulsification is developed, According to request, its output rotational speed can be continuously changed from 0 to 40 revolutions per minute. It can stably infuses emulsion to operating area.
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Affiliation(s)
- B Duan
- Institute of Biomedical Engineering, Chinese Academy of Medical Sciences
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19
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Abstract
An analytical iterative scheme is presented for computing the local characteristics of pressure and flow waves as they progress along a tree structure and become modified by wave reflections. Results are obtained to illustrate the phenomenon of pressure peaking under two different sets of circumstances. In the first case, the propagation of a single harmonic wave along a simple tree is considered, where wave reflections modify the amplitude of the pressure wave as it travels. In the second case, the propagation of a composite wave along a tree with multiple branches is considered, where wave reflections modify the shape of the wave as it travels and cause it to peak. The results demonstrate unambiguously that the root cause of this phenomenon is wave reflections caused by stepwise decreases in admittance, as has been previously suggested, rather than due to nonlinear interactions, as has also been previously suggested. It is shown clearly that even when wave reflections combine linearly, they lead to considerable peaking in the pressure waveform.
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Affiliation(s)
- B Duan
- Department of Applied Mathematics, University of Western Ontario, London, Canada
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20
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Abstract
Local hemodynamics in a bypass loop model with dimensions typical of those in the human coronary circulation are studied, particularly with regards to the effects of wave reflections. While in a single vessel of such dimensions and a single source of wave reflections the effects would be insignificant, in a bypass loop the combination of a narrowed vessel with a converging junction and several reflection sites may produce wave reflections with significant effects on the pressure and flow distributions within the vessels forming the loop. Calculations to test this possibility were performed, based on D'Alembert's solutions of the wave equation and with a proposed matching scheme to deal with the converging junction. The results indicate that there are very large wave reflection effects at a frequency of 10 Hz, smaller but significant effects at 5 Hz, and some insignificant effects at 1 Hz. The results also indicate that partial flow cut-off may occur within the loop under some singular circumstances, whereby certain harmonic components of the incident wave are totally reflected. In the clinical setting these effects would detract from the efficiency of the bypass as a conduit, to a degree dependent on the degree of occlusion of the bypassed vessel. The choice of a larger diameter for the bypass appears to diminish this dependence and is thus on the whole favorable despite the contribution it makes to impedance mismatch at the junction.
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Affiliation(s)
- B Duan
- Department of Applied Mathematics, University of Western Ontario, London, Canada
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21
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Abstract
Analytical expressions for the reflection coefficients in pulsatile flow through converging junctions are derived by two independent methods and are used to study the effects of wave reflections on the pressure distribution in a simple vascular loop. A simulated physiological situation is used as an example in which the loop is formed by the combination of a bypass and a bypassed vessel, the relative diameter of the latter being varied in order to simulate a narrowing. The results demonstrate how, in the case of a converging junction, the effects of wave reflections on the pressure distribution in one vessel depend on conditions within the vessel itself as well as in the other. The new reflection coefficients take into account this interdependence of flow in the two vessels forming a converging junction, and are shown to be consistent with reflection coefficients commonly used in diverging junctions.
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Affiliation(s)
- B Duan
- Department of Applied Mathematics and of Medical Biophysics, University of Western Ontario, London, Canada
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22
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Lan L, Zhang X, Duan B, Huo Z, Yassouridis A, Epplen JT. [Multi-locus DNA fingerprints using oligonucleotide probe (CAC)5/(GTG)5 in the Chinese population]. Arch Kriminol 1992; 189:169-77. [PMID: 1642498] [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: 12/28/2022]
Abstract
In order to test the practical applicability of oligonucleotide fingerprinting in China we have investigated unrelated individuals, family members and a pair of twins from the Beijing area using the probe (CAC)5/(GTG)5. Except for the monozygotic twins highly variable banding patterns were demonstrated as expected for the randomly selected individuals but also for the relatives. On the basis of an initial survey of 50 unrelated individuals the calculated probability for obtaining by chance two identical multilocus patterns is very small (less than 1.93 x 10(-13). Therefore it seems reasonable to conclude that like in caucasians, (CAC)5/(GTG)5 fingerprints are completely individual-specific also in this population. Therefore they have already been used successfully for identification purposes and paternity tests in many actual cases.
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Affiliation(s)
- L Lan
- Beijing Forensic Science Institute, PRC
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23
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Duan B. [Clinical characteristics of paroxysmal tachycardia in elders]. Zhonghua Xin Xue Guan Bing Za Zhi 1992; 20:115-6. [PMID: 1473479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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24
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Chen Z, Xu Y, Yu Q, Kou W, Lu Z, Yao K, Gao R, Chen J, Jia Y, Duan B. Secondary prevention of myocardial reinfarction with low dose aspirin. Chin Med Sci J 1991; 6:141-4. [PMID: 1793876] [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: 12/28/2022]
Abstract
A clinical trial of secondary prevention of reinfarction with low dose aspirin is reported. 50 mg aspirin per day was administered in 216 case. 211 cases did not take aspirin or any other antiplatelet agents as a control group. The follow-up periods in the two groups were 19.4 +/- 12.6 mon and 20.7 +/- 13.0 mon, respectively. There were 175 males in the aspirin group and 137 males in the control group. The incidence of reinfarction was reduced by 65% and platelet aggregation was inhibited obviously in the aspirin group as compared to the control group in men, whereas no significant trends were observed in women.
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Affiliation(s)
- Z Chen
- Cardiovascular Institute, CAMS, Beijing
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