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Zhou F, Ben Y, Jiang H, Tan S, Mu G, Zha Z, Dong S, Huang S, Zhou Y, Jin Y, Chiu ML. A Novel Dual-Fc Bispecific Antibody with Enhanced Fc Effector Function. Biochemistry 2024; 63:958-968. [PMID: 38426700 PMCID: PMC11025548 DOI: 10.1021/acs.biochem.3c00481] [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: 09/11/2023] [Revised: 01/31/2024] [Accepted: 01/31/2024] [Indexed: 03/02/2024]
Abstract
Bispecific antibodies (BsAbs) are undergoing continued development for applications in oncology and autoimmune diseases. While increasing activity by having more than one targeting arm, most BsAb engineering employs single Fc engagement as monoclonal antibodies. Here, we designed a novel immunoglobulin gamma-1 (IgG1)-derived dual-Fc BsAb containing two Fc regions and two distinct asymmetric antigen binding arms comprising a Fab arm and another VHH domain. In conjunction with the knob-into-hole technology, dual-Fc BsAbs could be produced with a high yield and good stability. We explore how Fc engineering effects on dual-Fc constructs could boost the desired therapeutic efficacy. This new format enabled simultaneous bispecific binding to corresponding antigens. Furthermore, compared to the one-Fc control molecules, dual-Fc BsAbs were shown to increase the avidity-based binding to FcγRs to result in higher ADCC and ADCP activities by potent avidity via binding to two antigens and Fc receptors. Overall, this novel BsAb format with enhanced effector functionalities provides a new option for antibody-based immunotherapy.
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Affiliation(s)
- Fulai Zhou
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Yinyin Ben
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Hao Jiang
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Siwen Tan
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Guangmao Mu
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Zhengxia Zha
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Shuting Dong
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Sheng Huang
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Yijun Zhou
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Ying Jin
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
| | - Mark L. Chiu
- Research
& Development Department, Tavotek Biotherapeutics, Suzhou 215000, China
- Research
& Development, Tavotek Biotherapeutics, Spring House, Pennsylvania 19102, United States
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2
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Yao Y, Zha Z, Li L, Tan H, Pi J, You C, Liu B. Healthcare-associated carbapenem-resistant Klebsiella pneumoniae infections are associated with higher mortality compared to carbapenem-susceptible K. pneumoniae infections in the intensive care unit: a retrospective cohort study. J Hosp Infect 2024; 148:30-38. [PMID: 38513959 DOI: 10.1016/j.jhin.2024.03.003] [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: 01/03/2024] [Revised: 03/06/2024] [Accepted: 03/11/2024] [Indexed: 03/23/2024]
Abstract
BACKGROUND Klebsiella pneumoniae (KP) is an opportunistic pathogen causing severe pneumonia and sepsis. Carbapenem-resistant KP (CRKP) has become a major pathogen in many centres. AIM To investigate the association between carbapenem resistance and the mortality rate, length of stay, and hospital cost in patients with Klebsiella pneumoniae infection. METHODS The retrospective cohort study was conducted in the intensive care units of a large teaching tertiary hospital in southwest China between January 1st, 2020 and December 31st, 2022. To examine the impact of carbapenem resistance on mortality rates and economic burden, multivariate Cox regression and generalized linear models were constructed. FINDINGS The study included 282 adult patients with KP infection (135 CSKP; 147 CRKP). CRKP-infected patients demonstrated higher mortality risk (unadjusted hazard ratio (aHR): 1.980; 95% confidence interval (CI): 1.206-3.248; P = 0.007; aHR: 1.767; 95% CI: 1.038-3.005; P = 0.036) compared to CSKP-infected patients. Stratified analysis, according to type of KP infection, revealed that patients with healthcare-associated CRKP infection had a significantly higher mortality risk compared to those with CSKP infection (log-rank P = 0.015). Patients with CRKP infection had longer hospital stays than those infected with CSKP (adjusted mean: 38.74 vs 29.71 days; P = 0.003), and hospital-related expenses were notably higher among CRKP patients than CSKP patients (adjusted cost: £40,126.73 vs 25,713.74; P < 0.001). CONCLUSION CRKP infections increase mortality rates, prolong hospital stays, and raise healthcare costs. Healthcare facilities should adopt targeted strategies, including curtailing pre-infection hospitalization periods and managing medications more judiciously.
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Affiliation(s)
- Y Yao
- Department of Healthcare-associated Infection Control, The Affiliated Hospital of Guizhou Medical University, Guiyang, China.
| | - Z Zha
- Department of Healthcare-associated Infection Control, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - L Li
- Department of Healthcare-associated Infection Control, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - H Tan
- Intensive Care Unit, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - J Pi
- Intensive Care Unit, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - C You
- Department of Financial Pricing, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
| | - B Liu
- Clinical Laboratory Centre, Guizhou Medical University, Guiyang, China
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3
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Zhang P, Qiao Z, Pan S, Yang P, Zha Z, Sun S, Xu Q, Liu X, Xu N, Liu Y. Activation of spinal ephrin-B3/EphBs signaling induces hyperalgesia through a PLP-mediated mechanism. Fundam Clin Pharmacol 2022; 36:262-276. [PMID: 34904278 DOI: 10.1111/fcp.12742] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 10/30/2021] [Accepted: 12/07/2021] [Indexed: 02/05/2023]
Abstract
Ephrin B/EphB signaling pathway is involved in the regulation of pain caused by spinal cord injury. However, the role of ephrin-B3/EphBs signaling in regulation of nociceptive information is poorly understood. In the present study, formalin-induced inflammatory pain, mechanical allodynia and thermal hyperalgesia, was measured using Efnb3 mutant mice (Efnb3-/- ) and wild-type (Efnb3+/+ ) mice. The spinal cord (L4-6) was selected for molecular and cellular identification by western blotting and immunofluorescence. Efnb3 mutant mice showed a significant increased the thermal and mechanical threshold, followed by aberrant thin myelin sheath. Furthermore, expression of proteolipid protein (PLP) was significantly lower in L4-6 spinal cord of Efnb3-/- mice. These morphological and behavioral abnormalities in mutant mice were rescued by conditional knock-in of wild-type ephrin-B3. Intrathecal administration of specific PLP siRNA significantly increased the thermal and mechanical threshold hyperalgesia in wild-type mice. However, overexpressing PLP protein by AAV9-PLP could decrease the sensitivity of mice to thermal and mechanical stimuli in Efnb3-/- mice, compared with scrabble Efnb3-/- mice. Further, Efnb3lacz mice, which have activities to initiate forward signaling, but transduce reverse signals by ephrin-B3, shows normal acute pain behavior, compared with wild type mice. These findings indicate that a key molecule Efnb3 act as a prominent contributor to hyperalgesia and essential roles of ephrin-B3/EphBs in nociception through a myelin-mediated mechanism.
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Affiliation(s)
- Pei Zhang
- Department of Pharmacognosy, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
| | - Zhen Qiao
- Department of Pharmacognosy, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
| | - Shu Pan
- Department of Pharmacognosy, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
| | - Ping Yang
- Department of Pharmacognosy, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
| | - Zhengxia Zha
- Department of Pharmacognosy, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
| | - Suya Sun
- Department of Neurology, Institute of Neurology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Department of Anatomy, Histology and Embryology, Neuroscience Division, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Qiongming Xu
- Department of Pharmacognosy, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
| | - Xingjun Liu
- School of Pharmacy, Nantong University, Nantong, Jiangsu Province, China
- Pain and Related Diseases Research Laboratory, Shantou University Medical College, Shantou, Guangdong Province, China
| | - Nanjie Xu
- Department of Anatomy, Histology and Embryology, Neuroscience Division, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yanli Liu
- Department of Pharmacognosy, College of Pharmaceutical Sciences, Soochow University, Suzhou, Jiangsu, China
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Zhang Y, Zha Z, Shen W, Li D, Kang N, Chen Z, Liu Y, Xu G, Xu Q. Anemoside B4 ameliorates TNBS-induced colitis through S100A9/MAPK/NF-κB signaling pathway. Chin Med 2021; 16:11. [PMID: 33461587 PMCID: PMC7814617 DOI: 10.1186/s13020-020-00410-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/10/2020] [Accepted: 12/10/2020] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Despite the increased morbidity of ulcerative colitis (UC) in the developing countries, available treatments remain unsatisfactory. Therefore, it is urgent to discover more effective therapeutic strategies. Pulsatilla chinensis was widely used for the treatment of inflamed intestinal diseases including UC for thousands of years in China. Anemoside B4, the most abundant triterpenoid saponin isolated from P. chinensis, exerts anti-inflammatory and antioxidant effects and may be the most active compounds, which is responsible for the therapeutic effects. However, the mechanism how anemoside B4 executes its biological functions is still elusive. METHODS Here, we used the 2, 4, 6-trinitrobenzene sulfonic acid (TNBS)-induced colitis rat model to evaluate the therapeutic effect of anemoside B4. Blood samples of colitis rats were collected for hematology analysis. The inflammation-associated factors were investigated by enzyme-linked immunosorbent assay (ELISA). Cell proliferation and apoptosis was determined with EdU cell proliferation assay and TUNEL assay. The proteins regulated by anemoside B4 were identified by label-free quantitative proteomics. The significantly down-regulated proteins were verified by Western blotting analysis. mRNA expression was analyzed by quantitative real-time RT-PCR. RESULTS The results showed that anemoside B4 ameliorated TNBS-induced colitis symptoms, including tissue damage, inflammatory cell infiltration, and pro-inflammatory cytokine production, apoptosis and slowed proliferation in colon. Quantitative proteomic analyses discovered that 56 proteins were significantly altered by anemoside B4 in the TNBS-induced rats. These proteins mainly clustered in tricarboxylic acid (TCA) cycle and respiratory electron transport chain. Among the altered proteins, S100A9 is one of the most significantly down-regulated proteins and associated with NF-κB and MAPK signaling pathways in the pathogenesis of UC. Further experiments revealed that anemoside B4 suppressed the expression of S100A9 and its downstream genes including TLR4 and NF-κB in colon. In vitro, anemoside B4 could inhibit the NF-κB signaling pathway induced by recombinant S100A9 protein in human intestinal epithelial Caco-2 cells. Moreover, anemoside B4 inhibits neutrophils recruitment and activation in colon induced by TNBS. CONCLUSIONS Our results demonstrate that anemoside B4 prevents TNBS-induced colitis by inhibiting the NF-κB signaling pathway through deactivating S100A9, suggesting that anemoside B4 is a promising therapeutic candidate for colitis.
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Affiliation(s)
- Yong Zhang
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China
| | - Zhengxia Zha
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China
| | - Wenhua Shen
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China
| | - Dan Li
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China.,Jiangsu Key Laboratory of Neuropsychiatric Diseases and Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases, Soochow University, Suzhou, 215123, Jiangsu, China
| | - Naixin Kang
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China
| | - Zhong Chen
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China
| | - Yanli Liu
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China
| | - Guoqiang Xu
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China. .,Jiangsu Key Laboratory of Neuropsychiatric Diseases and Jiangsu Key Laboratory of Preventive and Translational Medicine for Geriatric Diseases, Soochow University, Suzhou, 215123, Jiangsu, China.
| | - Qiongming Xu
- College of Pharmaceutical Sciences, Soochow University, Suzhou, 215123, Jiangsu, China.
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5
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Feng S, Zha Z, Wang Z, Yang P, Wu J, Li X, Xu Q, Liu Y. Anticancer activity of oleiferoside B involving autophagy and apoptosis through increasing ROS release in MCF-7 cells and SMMC-7721 cells. Nat Prod Res 2020; 35:4865-4869. [DOI: 10.1080/14786419.2020.1739039] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Suxiang Feng
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou, China
| | - Zhengxia Zha
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, China
| | - Zhe Wang
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou, China
| | - Ping Yang
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, China
| | - Jiangping Wu
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, China
| | - Xia Li
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, China
| | - Qiongming Xu
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, China
| | - Yanli Liu
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, China
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6
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He L, Zhang Y, Kang N, Wang Y, Zhang Z, Zha Z, Yang S, Xu Q, Liu Y. Anemoside B4 attenuates nephrotoxicity of cisplatin without reducing anti-tumor activity of cisplatin. Phytomedicine 2019; 56:136-146. [PMID: 30668334 DOI: 10.1016/j.phymed.2018.10.035] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 10/27/2018] [Accepted: 10/28/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND Cisplatin is a highly effective chemotherapeutic agent commonly used in the treatment of a wide variety of malignancies. However, its clinical usage is severely limited by its serious side effects, especially nephrotoxicity. Anemoside B4, is a major saponins, rich in root of Pulsatilla chinensis (Bunge), has anti-inflammation in vitro. However, the antioxidant or anti-inflammatory effects of anemoside B4 in cisplatin-induced nephrotoxicity have not been clearly demonstrated. PURPOSE In this study, we investigated whether anemoside B4 exhibits protective effects against cisplatin-induced nephrotoxicity involving antioxidant or anti-apoptosis effects. METHOD To clarify it, the effects of anemoside B4 on HEK 293 cell viability was measured by CCK8 kits, intracellular antioxidant capacity including glutathione reduced (GSH), catalase (CAT) were estimated using chemical kits, apoptosis rate and intracellular reactive oxygen species (ROS) was analyzed by flow cytometry, apoptosis protein was measured by western blotting. In vivo model of cisplatin-induced mice acute renal failure was performed to evaluate the properties of anemoside B4. Besides, to evaluate the effect of anemoside B4 on the anti-tumor activity of cisplatin, S180 xenograft models were used. RESULTS Anemoside B4 potently increased cisplatin-treated HEK 293T cells viability on the concentration and time manners and inhibited cells apoptosis, as demonstrated by the decreased cleaved PARP protein expressions. Anemoside B4 decreased reactive oxygen species (ROS) content and improved superoxide dismutase (SOD) activity. In vivo experiment showed that pretreatment with anemoside B4 effectively adjusted body weight and kidney index, and reduced cisplatin-elevated blood urea nitrogen (BUN) and creatinine (CREA) levels, as well as ameliorated the histopathological damage. Further studies showed that anemoside B4 did not reduce antitumor activity of cisplatin in murine S180 cancer xenograft tumor models. In addition, anemoside B4 per set showed low toxicity in mice. CONCLUSION The strong antioxidant and anti-apoptosis effects of anemoside B4 may provide therapeutic potential for cisplatin-induced nephrotoxicity without compromising its therapeutic efficiency.
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Affiliation(s)
- Luan He
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, Jiangsu province 215123, China
| | - Yong Zhang
- Department of Pharmacology, College of Pharmaceutical Science, Soochow University, Suzhou 215123, China
| | - Naixin Kang
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, Jiangsu province 215123, China
| | - Yaner Wang
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, Jiangsu province 215123, China; Department of Pharmacology, College of Pharmaceutical Science, Soochow University, Suzhou 215123, China
| | - Ziyu Zhang
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, Jiangsu province 215123, China
| | - Zhengxia Zha
- Department of Pharmacology, College of Pharmaceutical Science, Soochow University, Suzhou 215123, China
| | - Shilin Yang
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, Jiangsu province 215123, China
| | - Qiongming Xu
- Department of Pharmacognosy, College of Pharmaceutical Science, Soochow University, Suzhou, Jiangsu province 215123, China; College of Pharmacy, Guangxi University of Chinese Medicine, Nanning 530000, China.
| | - Yanli Liu
- Department of Pharmacology, College of Pharmaceutical Science, Soochow University, Suzhou 215123, China.
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Chen Y, Lin S, Sun Y, Guo J, Lu Y, Suen CW, Zhang J, Zha Z, Ho KW, Pan X, Li G. Attenuation of subchondral bone abnormal changes in osteoarthritis by inhibition of SDF-1 signaling. Osteoarthritis Cartilage 2017; 25:986-994. [PMID: 28131784 DOI: 10.1016/j.joca.2017.01.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 12/28/2016] [Accepted: 01/17/2017] [Indexed: 02/08/2023]
Abstract
BACKGROUND Current conservative treatments for osteoarthritis (OA) are largely symptoms control therapies. Further understanding on the pathological mechanisms of OA is crucial for new pharmacological intervention. OBJECTIVE In this study, we investigated the role of Stromal cell-derived factor-1(SDF-1) in regulating subchondral bone changes during the progression of OA. METHODS Clinical samples of different stages of OA severity were analyzed by histology staining, micro-CT, enzyme-linked immunosorbent assay (ELISA) and western blotting, to compare SDF-1 level in subchondral bone. The effects of SDF-1 on human mesenchymal stem cells (MSCs) osteogenic differentiation were evaluated. In vivo assessment was performed in an anterior cruciate ligament transaction plus medial meniscus resection in the SD rats. The OA rats received continuous infusion of AMD3100 (SDF-1 receptor blocker) in osmotic mini-pump implanted subcutaneously for 6 weeks. These rats were then terminated and subjected to the same in vitro assessments as human OA samples. RESULTS SDF-1 level was significantly elevated in the subchondral bone of human OA samples. In the cell studies, the results showed SDF-1 plays an important role in osteogenic differentiation of MSCs. In the OA animal studies, there were less cartilage damage in the AMD3100-treated group; microCT results showed that the subchondral bone formation was significantly reduced and so did the number of positive Nestin or Osterix cells in the subchondral bone region. CONCLUSIONS Higher level of SDF-1 may induce the subchondral bone abnormal changes in OA and inhibition of SDF-1 signaling could be a potential therapeutic approach for OA.
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Affiliation(s)
- Y Chen
- Institute of Orthopedic Diseases and Department of Orthopedics, The First Affiliated Hospital, Jinan University, Guangzhou, PR China; Department of Orthopaedics & Traumatology, Li Ka Shing Institute of Health Sciences and Lui Che Woo Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong Special Administrative Region; The CUHK-ACC Space Medicine Centre on Health Maintenance of Musculoskeletal System, The Chinese University of Hong Kong, Shenzhen Research Institute, Shenzhen, PR China
| | - S Lin
- Department of Orthopaedics & Traumatology, Li Ka Shing Institute of Health Sciences and Lui Che Woo Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong Special Administrative Region; The CUHK-ACC Space Medicine Centre on Health Maintenance of Musculoskeletal System, The Chinese University of Hong Kong, Shenzhen Research Institute, Shenzhen, PR China
| | - Y Sun
- Department of Orthopaedics & Traumatology, Li Ka Shing Institute of Health Sciences and Lui Che Woo Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong Special Administrative Region; The CUHK-ACC Space Medicine Centre on Health Maintenance of Musculoskeletal System, The Chinese University of Hong Kong, Shenzhen Research Institute, Shenzhen, PR China
| | - J Guo
- Department of Orthopaedics & Traumatology, Li Ka Shing Institute of Health Sciences and Lui Che Woo Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong Special Administrative Region
| | - Y Lu
- Department of Orthopaedics & Traumatology, Li Ka Shing Institute of Health Sciences and Lui Che Woo Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong Special Administrative Region
| | - C W Suen
- Department of Orthopaedics & Traumatology, Li Ka Shing Institute of Health Sciences and Lui Che Woo Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong Special Administrative Region; The CUHK-ACC Space Medicine Centre on Health Maintenance of Musculoskeletal System, The Chinese University of Hong Kong, Shenzhen Research Institute, Shenzhen, PR China
| | - J Zhang
- Department of Orthopaedics & Traumatology, Li Ka Shing Institute of Health Sciences and Lui Che Woo Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong Special Administrative Region; The CUHK-ACC Space Medicine Centre on Health Maintenance of Musculoskeletal System, The Chinese University of Hong Kong, Shenzhen Research Institute, Shenzhen, PR China
| | - Z Zha
- Institute of Orthopedic Diseases and Department of Orthopedics, The First Affiliated Hospital, Jinan University, Guangzhou, PR China
| | - K W Ho
- Department of Orthopaedics & Traumatology, Li Ka Shing Institute of Health Sciences and Lui Che Woo Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong Special Administrative Region.
| | - X Pan
- Department of Orthopaedics and Traumatology, Bao-An District People's Hospital, Shenzhen, PR China
| | - G Li
- Department of Orthopaedics & Traumatology, Li Ka Shing Institute of Health Sciences and Lui Che Woo Institute of Innovative Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong Special Administrative Region; The CUHK-ACC Space Medicine Centre on Health Maintenance of Musculoskeletal System, The Chinese University of Hong Kong, Shenzhen Research Institute, Shenzhen, PR China; Key Laboratory for Regenerative Medicine, Ministry of Education, School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong Special Administrative Region.
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Cohn C, Leung SL, Crosby J, Lafuente B, Zha Z, Teng W, Downs R, Wu X. Lipid-mediated protein functionalization of electrospun polycaprolactone fibers. EXPRESS POLYM LETT 2016; 10:430-437. [PMID: 32206095 DOI: 10.3144/expresspolymlett.2016.40] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
In this study, electrospun polycaprolactone (PCL) fibers are plasma-treated and chemically conjugated with cholesteryl succinyl silane (CSS). In addition to Raman spectroscopy, an immobilization study of DiO as a fluorescent probe of lipid membranes provides evidence supporting the CSS coating of plasma-treated PCL fibers. Further, anti-CD20 antibodies are used as a model protein to evaluate the potential of lipid-mediated protein immobilization as a mechanism to functionalize the CSS-PCL fiber scaffolds. Upon anti-CD20 functionalization, the CSS-PCL fiber scaffolds capture Granta-22 cells 2.4 times more than the PCL control does, although the two fiber scaffolds immobilize a comparable amount of anti-CD20. Taken together, results from the present study demonstrate that the CSS coating and CSS-mediated antibody immobilization offers an appealing strategy to functionalize electrospun synthetic polymer fibers and confer cell-specific functions on the fiber scaffolds, which can be mechanically robust but often lack biological functions.
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Affiliation(s)
- C Cohn
- Biomedical Engineering Graduate IDP, University of Arizona, AZ 85721 Tucson, USA
| | - S L Leung
- Aerospace & Mechanical Engineering, University of Arizona, AZ 85721 Tucson, USA
| | - J Crosby
- Biomedical Engineering Graduate IDP, University of Arizona, AZ 85721 Tucson, USA
| | - B Lafuente
- Department of Geosciences, University of Arizona, AZ 85721 Tucson, USA
| | - Z Zha
- Aerospace & Mechanical Engineering, University of Arizona, AZ 85721 Tucson, USA
| | - W Teng
- Aerospace & Mechanical Engineering, University of Arizona, AZ 85721 Tucson, USA
| | - R Downs
- Department of Geosciences, University of Arizona, AZ 85721 Tucson, USA
| | - X Wu
- Biomedical Engineering Graduate IDP, University of Arizona, AZ 85721 Tucson, USA.,Aerospace & Mechanical Engineering, University of Arizona, AZ 85721 Tucson, USA
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9
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Shen WJ, Shen YM, Zha Z, Zhou YT, Xu PC, Song T, Wu YB. [The clinical and pathologic study of embeded supernumerary teeth]. Shanghai Kou Qiang Yi Xue 2001; 10:108-9, 118. [PMID: 14994030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
OBJECTIVE To analyse the clinic and pathologic features of 100 embedded supernumerary teeth, to find out the rule of cystic change of supernumerary teeth and its relationship to malocclusion, and to present the methods of therapy. METHODS Analysis of clinical data, X-ray manifestation,comparison of the findings on operation and pathological changes demonstrated the correct diagnosis of supernumerary teeth. RESULTS On statistics and analysis,66% of the crowns of the supernumerary teeth were showed different sizes of circular photic shades,but only 35% were proved to be cystic change by biopsies. CONCLUSION This study showed that 35% had cystic change among 100 cases,so if the diagnosis can be made in these cases with indication of operation the extraction of the supernumerary teeth must be done as soon as possible.
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Affiliation(s)
- W J Shen
- Department of Oral Surgery, Shanghai Xuhui Dental Center, Shanghai 200032, China
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10
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Wang D, Zha Z. Treatment of traumatic defect of the tibia with two exposed fractured ends--reduction and lengthening at the proximal metaphysics of tibia. Curr Med Sci 1997; 17:187-9. [PMID: 9812775 DOI: 10.1007/bf02888299] [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: 01/24/1997] [Indexed: 10/19/2022]
Abstract
From Jan. 1995 to June 1996, 6 cases of traumatic defect of the tibia were treated by remodeling and reduction of fractured ends and osteotomy and distraction at the proximal metaphysics of the tibia. In 6 patients, aged 19 to 54, with the limb-length discrepancy being at least 3 to 4.5 cm, the tibia was lengthened by 3 cm in 3 cases, 4 to 4.5 cm in 3 cases. The consolidation and maturation of the bone were accomplished within 3 to 6 months. The authors believe that this procedure is simple, less invasive and involves no bone-graft.
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Affiliation(s)
- D Wang
- Department of Orthopedics, Overseas Hospital, Medical College of Jinan University, Guangzhou
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Abstract
The clinical significance of the expression of lymphoid-associated antigens in leukemic cells was studied in 66 children with newly diagnosed acute myeloid leukemia (AML). Among 66 AML cases, 17% were CD7-positive, 15% were CD19-positive, 8% were CD2-positive, and 5% were CD10-positive. In 23 (35%) of the 66 AML cases, at least one lymphoid-associated antigen was expressed in the leukemic cells. When the clinical features and laboratory findings were compared at diagnosis between the 23 Ly+ and the 43 Ly- AML cases, no statistically significant difference was found. The expression of CD34 was significantly more frequent in Ly+ AML cases (91%) than in Ly- AML cases (31%). Chromosomal analysis revealed t(8;21) in 6 of the 21 Ly+ AML cases examined. No other specific chromosome aberration was noted. The 3-year event-free survival rates of Ly+ AML cases and Ly- AML cases were 34% +/- 12% and 26% +/- 8%, respectively. There was no statistically significant difference between the two groups. Further studies are required to determine the prognostic significance of lymphoid-associated antigen expression.
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Affiliation(s)
- S Kawai
- Department of Pediatrics, Aichi Medical University, Nagoya, Japan
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Kawai S, Fujimoto T, Zha Z, Asami K, Oka T, Kaneko Y, Takaue Y, Ninomiya T, Nishikawa K, Tsuchiya T. [Results of the CCLSG high risk ALL 874 protocol in childhood acute lymphoblastic leukemia. Children's Cancer and Leukemia Study Group]. Rinsho Ketsueki 1993; 34:128-36. [PMID: 8492409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
One hundred and eighty eight children with acute lymphoblastic leukemia (ALL) were treated in a Children's Cancer and Leukemia Study Group high-risk ALL 874 study from April, 1987 to September, 1991. These patients received a four-drug induction regimen followed by the early consolidation regimen, cranial irradiation at 6 months of remission and three years of continuation therapy with rotational administration of four drugs. The patients were randomized into two regimens. In regimen A, the consolidation chemotherapy consisted of the intermediate dose cytosine arabinoside (Ara-C), cyclophosphamide (CPM) plus 6MP, and in regimen B, it consisted of high-dose Ara-C plus CPM. Regimen A was given to 106 patients and 82 patients received regimen B. The complete remission induction rate for regimen A and B was 89.4% (93/104) and 98.7% (78/79), respectively. The 3-year event-free-survival (EFS) rate was 70.6% for regimen A, which was higher than the 56.7% for regimen B. The 3-year EFS rate was 44.4% for the 53 patients with an initial leukocyte count > or = 10 x 10(4)/microliters and 72.2% for 132 patients with a leukocyte count < 10 x 10(4)/microliter. We considered that Ara-C plus L-asp, added to the conventional high-risk ALL 811 protocol, improved the prognosis of the high risk ALL patients. However, further intensive chemotherapy was required for improvement of the outcome of the patients with hyperleukocytosis (> or = 10 x 10(4)/microliters).
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Affiliation(s)
- S Kawai
- Department of Pediatrics, Aichi Medical University
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Kawai S, Zha Z, Yamamoto Y, Nakadate H, Kawakami K, Kikuta A, Utsumi J, Nishikawa K, Mimaya J, Miyake M. [Analysis of cytoplasmic antigens in acute leukemia by flow cytometry]. Rinsho Ketsueki 1993; 34:13-20. [PMID: 8450602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The expression of cytoplasmic antigens in 77 cases of acute leukemia were analyzed by flow cytometry using the following monoclonal antibodies: CD3, CD22, anti-myeloperoxidase (MPO-7) and anti-mu-heavy chain. CD22 antigen was detected in the cytoplasm of all non-T-ALL patients excluding one not-tested patient. In two patients with unclassified ALL, surface CD22 antigen was not expressed but cytoplasmic CD22 antigen was strongly expressed. Three out of 9 patients with common ALL were cytoplasmic mu-heavy chain-positive, so these patients were diagnosed as Pre-B ALL. In four out of 8 patients with T-ALL, CD3 antigen was not expressed on the cell surface membrane. However all of T-ALL patients excluding one non-tested patient were cytoplasmic CD3-positive. The cytoplasmic expression of myeloperoxidase antigen was detected in twenty out of 21 patients with acute non-lymphoblastic leukemia (ANLL). One megakaryocytic leukemia patient was MPO-negative. In two ANLL patients, the percentage of MPO for conventional cytochemical staining was undetectable or low, but MPO antigens were positive (77% and 70%) for flow cytometric analysis. All of 46 non-T ALL patients were cytoplasmic MPO-negative, however 4 out of 10 T-ALL patients were cytoplasmic MPO-positive. The study proved that the analysis of cytoplasmic CD3, CD22, mu-chain and MPO antigens were very useful to define the cell lineage of leukemia and to classify ALL and ANLL. It is necessary to study further whether the expression of MPO in the cytoplasm of T-ALL was non-specific reaction or whether MPO precursors are expressed in the cytoplasm of T-ALL.
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Affiliation(s)
- S Kawai
- Department of Pediatrics, Aichi Medical University
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Tsurusawa M, Ito M, Zha Z, Kawai S, Takasaki Y, Fujimoto T. Cell-cycle-associated expressions of proliferating cell nuclear antigen and Ki-67 reactive antigen of bone marrow blast cells in childhood acute leukemia. Leukemia 1992; 6:669-74. [PMID: 1352561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
To investigate the growth characteristics of human leukemia cells, the expression of proliferation-associated nuclear antigens was examined in relation to cell cycle phases in marrow blast cells obtained from 37 untreated children with acute leukemia. Ki-67 monoclonal antibody reactive antigen and proliferating cell nuclear antigen (PCNA) were measured by the simultaneous flow cytometric analysis of DNA and nuclear antigens. The percentage of PCNA-positive cells was always higher than that of Ki-67-positive cells in individual patients. The level of PCNA was greatly increased in G1 or early S phase, but was generally stable in S and G2 phases. Accordingly, most of the cells in the proliferative compartments (greater than 2C DNA) showed a high expression of PCNA. In contrast, expression of Ki-67 antigen varied greatly from patient to patient, and differed significantly in different subtypes of the disease. The level of Ki-67 antigen increased with the cell cycle progression, showing maximum expression in late S and G2 phases. However, in most of the patients, a distinct population of Ki-67-negative cells was found not only in G1 phase, but also in the proliferative compartments. These results appear to reflect differences in the proliferative activity of bone marrow blast cells in childhood acute leukemia.
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Affiliation(s)
- M Tsurusawa
- Department of Pediatrics, Aichi Medical University, Japan
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Ito M, Tsurusawa M, Zha Z, Kawai S, Takasaki Y, Fujimoto T. Cell proliferation in childhood acute leukemia. Comparison of Ki-67 and proliferating cell nuclear antigen immunocytochemical and DNA flow cytometric analysis. Cancer 1992; 69:2176-82. [PMID: 1347483 DOI: 10.1002/1097-0142(19920415)69:8<2176::aid-cncr2820690827>3.0.co;2-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The proliferative activity of bone marrow leukemia cells was determined by DNA flow cytometric (FCM) analysis and labeling index (LI) of Ki-67 monoclonal antibodies and proliferating cell nuclear antigen (PCNA) autoantibodies in 73 children with acute leukemia. LI of Ki-67 varied greatly from patient to patient (range, 0.4% to 42.2%; mean, 18.8%) and differed significantly between acute lymphoblastic leukemia (ALL) and acute nonlymphoblastic leukemia (ANLL). In ALL, the Ki-67 LI showed a positive correlation with the S-phase fraction (SPF) determined by DNA FCM analysis, whereas, in ANLL, there was a discrepancy between the Ki-67 LI and SPF. In contrast, LI of PCNA varied less among the patients (range, 57.2% to 100%; mean, 90.3%), and the value was always higher than that of the Ki-67 LI in individual patients. A significant relationship between PCNA LI and the percentage of blast cells was found in peripheral blood leukocytes from patients with leukemia. These results suggest that the Ki-67 LI reflects differences in the proliferative activity depending on the subtype of the disease and that the PCNA LI is useful as a marker of proliferating cells.
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Affiliation(s)
- M Ito
- Department of Pediatrics, Children's Cancer and Leukemia Study Group (CCLSG), Aichi Medical University, Aichi-ken, Japan
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Zhou Z, Lan T, Zha Z, Wang Y, Yang Z. [Influences of new synthetic drug vesnarinone on circulatory and respiratory function of dogs]. Hua Xi Yi Ke Da Xue Xue Bao 1991; 22:137-9. [PMID: 1786948] [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
The purpose of this study was to investigate the influences of vesnarinone, newly synthesized in the School of Pharmacy, West China University of Medical Sciences in 1985, on the circulatory and respiratory functions of dogs. Eight dogs were anesthetized with 3% sodium pentobarbital. Vesnarinone (2 mg/kg), dimethyl sulphoxide (the solvent which was needed to prepare solution of OPC-8212), and 0.9% NaCl (normal control) was given separately according to the arrangement of Latin square. The ECG, blood flow, blood pressure and respiration were measured and recorded for 1-15 minutes. Vesnarinone increased the blood flow in the common carotid artery with no significant changes in blood pressure, heart rate, or respiration. These results suggest that OPC-8212 has positive inotropic effect but no effect on the heart rate in anesthetized dogs.
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Cheng J, Meng P, Lan T, Zha Z. [Research and application of SUPER-1 intellectural instrument used in physiology laboratory]. Hua Xi Yi Ke Da Xue Xue Bao 1991; 22:107-10. [PMID: 1774026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Research work for making a biomedical signal processing instrument based on the APPLE-II computer is reported in this paper. According to the theory of the computer, two interface boards were designed as the hardware of the instrument. The memorizing waveform program was designed as the main program in the software system. Through a functional extended program, also called software inter face, more than ten programs especially for physiology can be easily linked to the main program. with the combination of both the software and hard ware several parameters of the instrument, such as sampling speed, gain of the amplifier, etc. can be controlled by a closed loop. This instrument is available in the physiology laboratory to replace oscilloscope, recorder, stimulator simultaneously. The functions of the instrument are stronger than those of the conventional instruments.
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Zha Z, Lan T, Zhou Z, Yang Z. [Effect of a new positive inotropic agent (OPC-8212) on intracellular potential of isolated canine ventricular papillary muscle]. Hua Xi Yi Ke Da Xue Xue Bao 1990; 21:159-62. [PMID: 2391096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
This study adopted intracellular microelectrode technic to observe the effect of OPC-8212 (Vesnarinone) on intracellular potential of isolated canine ventricular papillary muscle. The record and data processing were completed by computerized intellective instrument designed by ourselves. The results of intracellular record in 14 canine ventricular papillary muscle showed no significant change in the resting potential (RP), amplitude of action potential (APA) and maximum depolarize velocity of 0 phase (Vmax). But significantly increased whole duration of action potential (APT). The duration of repolarization to 1/3 (APD 1/3) and to 2/3 (APD 2/3) significantly increased too. The plateau phase raised. These results suggest that K+ permeability at resting myocardiac cell membrane may have not been effected by OPC-8212. Activation of the fast sodium channel may have not been effected too. The results of our studies also suggest that inward flow of Ca2+ increased. The delayed outward K+ (Ik) and the inward, rectifying K+ current (Ik1) possible decreased. Thus, the OPC-8212 might become a nonglucoside and noncatecholamine new positive inotropic drug.
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