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Xi XD, Mao JH, Wang KK, Caen J, Chen SJ. Hémorragie dans la leucémie aiguë promyélocytaire et au-delà : Les rôles du facteur tissulaire et des mécanismes de régulation sous-jacents1. Bulletin de l'Académie Nationale de Médecine 2023. [DOI: 10.1016/j.banm.2023.01.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
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Shi XF, Hu SD, Wu LL, Chen XY, Wu JN, Yu XQ, Li DY, Chen M, Liu YC, Zhu Y, Xi XD. Lymphadenopathy in POEMS syndrome: a correlation between clinical features and imaging findings. Int J Clin Exp Pathol 2020; 13:21-25. [PMID: 32055268 PMCID: PMC7013372] [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: 11/09/2019] [Accepted: 12/19/2019] [Indexed: 06/10/2023]
Abstract
Lymphadenopathy is an important characteristic of POEMS syndrome, and a Castleman disease (CD)-like pathologic change in the lymph nodes is one of the major diagnostic criteria. However, the characteristics of lymphadenopathy in POEMS still have not been completely elucidated. The lymph node biopsies are available only for a small proportion of patients. A simple and safe way is needed to rule CD in or out. This study aimed to analyse the features of lymphadenopathy and estimate the role of imaging methods, including computed tomography (CT) and positron emission tomography-CT (PET/CT), in the diagnosis of lymphadenopathy in patients with POEMS syndrome. We conducted a retrospective analysis of 23 patients with confirmed POEMS syndrome. All of the patients received chest and abdominal CT scan and/or superficial ultrasound examinations. Four patients underwent PET/CT examinations, and 6 patients received lymph node biopsies. Enlarged lymph nodes (short diameter ≥ 1 cm) were found in 48% (11/23) of patients, but only 1 patient had an enlarged lymph node with a diameter ≥ 2 cm. Lymph nodes with CD-like pathologic changes from 2 patients showed increased maximum standard uptake values (SUVmax) of 18F-deoxyglucose (18FDG) on PET/CT, while lymph nodes with reactive pathologic changes from 2 other patients showed a normal metabolic PET/CT profile. The extent of lymph node enlargement in patients with POEMS was less than that in patients with CD per se. We draw the conclusion that most of the enlarged lymph nodes had diameters ≤ 2 cm, which is less than that in cases of CD per se and PET/CT may be helpful in determining whether enlarged lymph nodes are characterized by CD-like changes or not.
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Affiliation(s)
- Xiao-Feng Shi
- Affiliated Hospital of Jiangsu UniversityZhenjiang, Jiangsu, PR China
- Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai, PR China
| | - Shu-Dong Hu
- Affiliated Hospital of Jiangnan UniversityWuxi, Jiangsu, PR China
| | - Li-Li Wu
- Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai, PR China
| | - Xiao-Yan Chen
- Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai, PR China
| | - Jian-Nong Wu
- Affiliated Hospital of Jiangsu UniversityZhenjiang, Jiangsu, PR China
| | - Xian-Qiu Yu
- Affiliated Hospital of Jiangsu UniversityZhenjiang, Jiangsu, PR China
| | - Dong-Ya Li
- Affiliated Hospital of Jiangsu UniversityZhenjiang, Jiangsu, PR China
| | - Min Chen
- Affiliated Hospital of Jiangsu UniversityZhenjiang, Jiangsu, PR China
| | - Yi-Chen Liu
- Affiliated Hospital of Jiangsu UniversityZhenjiang, Jiangsu, PR China
| | - Yan Zhu
- Affiliated Hospital of Jiangsu UniversityZhenjiang, Jiangsu, PR China
| | - Xiao-Dong Xi
- Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai, PR China
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Li DY, Mao JH, Zhang W, Chen XJ, Xiao B, Ruan Z, Wang Y, Jiang GX, Shi XF, Xi XD. [Effect of Amino Acid Motifs in Integrin β3 Cytoplasmic Tail on αⅡbβ3-Mediated Cell function in 293T cell models]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2019; 27:227-232. [PMID: 30738475 DOI: 10.7534/j.issn.1009-2137.2019.01.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE To establish 293T cell lines stably expressing Calpain-cleavage related α3 cytoplasmic tail mutants, and to explore the effect of amino acid motifs in integrin β3 cytoplasmic tail on αⅡbβ3-mediated cell function. METHODS 293T cell lines stably co-expressing human wild type integrin αⅡb and full length β3 or mutant β3, including β3-ΔNITY (β3 cytoplasmic tail NITY motif deleted), β3-Δ754 (β3 cytoplasmic tail TNITYRGT motif deleted) and β3-Δ759 (β3 cytoplasmic tail RGT motif deleted) were established. Spreading and adhesion of these stable cell lines on immobilized fibrinogen were tested. RESULTS 293T-αⅡbβ3ΔNITY, 293T-αⅡbβ3Δ754, 293T-αⅡbβ3Δ759 and 293T-αⅡbβ3 cell lines were successfully established. Compared with the 293T cells, 293T-αⅡbβ3 cells which expressed full β3, possessed well adhesion and spread ability on immobilized fibrinogen, suggesting it can be as a surrogate for platelet. Compared with 293T-αⅡbβ3 cells, the 293T-αⅡbβ3ΔNITY cells showed a partial impairment of adhesion and spreadability on immobilized fibrinogen. while the 293T-αⅡbβ3Δ754 cells and 293T-αⅡbβ3Δ759 cells failed to adhere or spread on immobilized fibrinogen. CONCLUSION To the cell spreading function mediated by integrin β3, RGT motif is vital, while NITY can be dispensable. These established 293T cell lines stably expressing different β3 mutants provide a solid basis for a further analysis of mass spectrometry.
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Affiliation(s)
- Dong-Ya Li
- Department of Hematology, Affiliated Hospital of Jiangsu University, Zhenjiang, 212100 Jiangsu Province, China
| | - Jian-Hua Mao
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Wei Zhang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Xin-Jie Chen
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Bing Xiao
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Zheng Ruan
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Yun Wang
- Department of Hematology, Affiliated Hospital of Jiangsu University, Zhenjiang, 212100 Jiangsu Province, China
| | - Guo-Xiong Jiang
- Department of Hematology, Affiliated Hospital of Jiangsu University, Zhenjiang, 212100 Jiangsu Province, China
| | - Xiao-Feng Shi
- Department of Hematology, Affiliated Hospital of Jiangsu University, Zhenjiang, 212100 Jiangsu Province, China
| | - Xiao-Dong Xi
- Department of Hematology, Affiliated Hospital of Jiangsu University, Zhenjiang, 212100 Jiangsu Province, China.E-mail:
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Cui W, Wang J, Nie RM, Zhao LL, Gao MQ, Zhu HM, Chen L, Hu J, Li JM, Shen ZX, Wang ZY, Chen SJ, Chen Z, Wang KK, Xi XD, Mi JQ. Arsenic trioxide at conventional dosage does not aggravate hemorrhage in the first-line treatment of adult acute promyelocytic leukemia. Eur J Haematol 2018; 100:344-350. [DOI: 10.1111/ejh.13018] [Citation(s) in RCA: 5] [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] [Accepted: 11/28/2017] [Indexed: 12/18/2022]
Affiliation(s)
- Wen Cui
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
- Department of Clinical Laboratory; Shanghai Municipal Hospital of Traditional Chinese Medicine; Shanghai University of Traditional Chinese Medicine; Shanghai China
| | - Jin Wang
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Rui-Min Nie
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Ling-Ling Zhao
- Department of Clinical Laboratory; Shanghai Xuhui Central Hospital; Shanghai China
| | - Meng-Qing Gao
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Hong-Ming Zhu
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Li Chen
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Jiong Hu
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Jun-Min Li
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Zhi-Xiang Shen
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Zhen-Yi Wang
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Sai-Juan Chen
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Zhu Chen
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Kan-Kan Wang
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
| | - Xiao-Dong Xi
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
- Collaborative Innovation Center of Hematology; Shanghai China
| | - Jian-Qing Mi
- Shanghai Institute of Hematology; State Key Laboratory for Medical Genomics and Department of Hematology; Collaborative Innovation Center of Systems Biomedicine; Pôle Sino-Français des Sciences du Vivant et Genomique; Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine; Shanghai China
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Sun HM, Chen XL, Chen XJ, Liu J, Ma L, Wu HY, Huang QH, Xi XD, Yin T, Zhu J, Chen Z, Chen SJ. PALLD Regulates Phagocytosis by Enabling Timely Actin Polymerization and Depolymerization. J Immunol 2017; 199:1817-1826. [PMID: 28739877 DOI: 10.4049/jimmunol.1602018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Accepted: 06/12/2017] [Indexed: 12/28/2022]
Abstract
PALLD is an actin cross-linker supporting cellular mechanical tension. However, its involvement in the regulation of phagocytosis, a cellular activity essential for innate immunity and physiological tissue turnover, is unclear. We report that PALLD is highly induced along with all-trans-retinoic acid-induced maturation of myeloid leukemia cells, to promote Ig- or complement-opsonized phagocytosis. PALLD mechanistically facilitates phagocytic receptor clustering by regulating actin polymerization and c-Src dynamic activation during particle binding and early phagosome formation. PALLD is also required at the nascent phagosome to recruit phosphatase oculocerebrorenal syndrome of Lowe, which regulates phosphatidylinositol-4,5-bisphosphate hydrolysis and actin depolymerization to complete phagosome closure. Collectively, our results show a new function for PALLD as a crucial regulator of the early phase of phagocytosis by elaborating dynamic actin polymerization and depolymerization.
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Affiliation(s)
- Hai-Min Sun
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Xin-Lei Chen
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Xin-Jie Chen
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Jin Liu
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Lie Ma
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Hai-Yan Wu
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Qiu-Hua Huang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Xiao-Dong Xi
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Tong Yin
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Jiang Zhu
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Zhu Chen
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Sai-Juan Chen
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
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Mao JH, Huang QH, Liu P, Luo C, Xi XD. [Role and Mechanism of the Interaction of BCR-ABL with E3 Ligase c-CBL in Targeting Therapy of Chronic Myelogenous Leukemia]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2017; 25:42-49. [PMID: 28245373 DOI: 10.7534/j.issn.1009-2137.2017.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE To explore the interaction domains between BCR-ABL and E3 liagase c-CBL, so as to reveal the structure-basis for the arsenic to treat chronic myelogenous leukemia(CML). METHODS The interactional interface of BCR-ABL and c-CBL was simulated and analyzed according to the available structure model. Based on the structural information, the WT and mutant Migr1-BCR-ABL-GFP (ΔSH2,ΔTyrKC,ΔSH2/TyrKC (S/H) and pFlag-c-CBL (ΔRF) were constructed and co-transfected into the 293T and HeLa cells. The co-immunoprecipitation (Co-IP) was performed by using M2 beads (anti-Flag), anti-GFP antibody and protein A beads, and the interaction was identified by using GFP and M2 antibody, respectively. Moreover, the colocalization of BCR-ABL and c-CBL was further evaluated by using immunofluorescent(IF) assay in transfected HeLa cells. RESULTS Co-IP demonstrated that the TyrKC domain of BCR-ABL was primarily involved in the interaction with c-CBL, while both the SH2 domain of BCR-ABL and the RF domain of c-CBL also participated in the interaction to a certain degree, which were consistent with the structure-based simulation. IF elucidated that the colocalization of BCR-ABL and c-CBL was almost entirely vanished when the deleted TyrKC domain of BCR-ABL was co-transfected with c-CBL, which were elegantly coincident with the results from Co-IP. CONCLUSION The TyrKC domain of BCR-ABL is sufficient and necessary to mediate the interaction between BCR-ABL and c-CBL, the SH2 domain of BCR-ABL and the RF domain of c-CBL are also involved in the association between the two proteins. It suggests that the association of BCR-ABL and c-CBL can modulate the stability and degradation of BCR-ABL, thus illustrating the molecular mechanisms of the targeting therapy for CML by arsenic.
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Affiliation(s)
- Jian-Hua Mao
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Qiu-Hua Huang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Ping Liu
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Cheng Luo
- State Key Laboratory of Drug Research, Drug Discovery and Design Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
| | - Xiao-Dong Xi
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital Affiliated to Shanghai Jiaotong University School of Medicine, Shanghai 200025, China. E-mail:
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Yang JC, Shi XF, Huang JS, Long ZB, Xiao B, Ruan Z, Xi XD. [Effect of the Integrin β3 Cytoplasmic NITY Motif on α II bβ3-Mediated Cell Functions in CHO Cell Model]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2015; 23:768-73. [PMID: 26117034 DOI: 10.7534/j.issn.1009-2137.2015.03.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
UNLABELLED OBJLECTIVE: To investigate the effect of integrin β3 cytoplasmic NITY motif on αIIbβ3-mediated cell functions. METHODS Stable Chinese hamster ovary (CHO) cell lines that co-express human wild type integrin αIIb and wild type β3 or mutant β3ΔNITY (β3 deleting cytoplasmic NITY motif) were established. Expression of αIIb and β3 were tested by Western blot and flow cytometry in CHO cell lines. Spreading and adhesion of stable cell lines on immobilized fibrinogen were examined. The co-immunoprecipitation was used to detect protein interactions. RESULTS CHO-αIIbβ3, CHO-αIIbβ3ΔNITY cells were successfully established. The CHO cells transfected with wild type αIIbβ3 had the ability of adhesion and spreading. Compared with CHO-αIIbβ3 cells, CHO-αIIbβ3ΔNITY cells showed an impaired capacity of adhesion but no significant difference was observed in spreading of adhered cells. The co-immunoprecipitation showed that kindlin-2 associated with wild type integrin αIIbβ3. The β3ΔNITY mutation substantially reduced kindlin-2 association. CONCLUSION Deletion of NITY motif causes an impaired ability of adhesion. The deletion mutation can suppress kindlin-2 binding to integrin β3, thereby partially inhibit the integrin β3 signaling.
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Affiliation(s)
- Ji-Chun Yang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Xiao-Feng Shi
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Jian-Song Huang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Zhang-Biao Long
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Bing Xiao
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Zheng Ruan
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Xiao-Dong Xi
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China. E-mail:
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Long ZB, Huang JS, Shi XF, Yang JC, Ruan Z, Xiao B, Xi XD. [Myr-RKEFAK Peptide Selectively Regulates Outside-in Signaling Transduction-related Functions in Human Platelets]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2015; 23:761-7. [PMID: 26117033 DOI: 10.7534/j.issn.1009-2137.2015.03.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
OBJECTIVE To study the effect of interaction of the talin rod domain integrin binding site 2 with integrin β3 on platelet signal transduction. METHODS A peptide that mimics the membrane proximal α helix 6 residues R724 KEFAK729 of the integrin β3 cytoplasmic tails was designed and synthesized, to which the myristoylation was covalently linked to the N-terminal of the peptide enabling membrane penetration. The effects of myr-RKEFAK peptide on the typical platelet outside-in signaling ovent (stable adhesion and spreading on immobilized fibrinogen, aggregation, fibrin clot retraction) and inside-out signaling events (soluble fibrinogen binding) were tested. RESULTS myr-RKEFAK peptide dose-dependently inhibited platelet stable adhesion and spreading on immobilized fibrinogen, irreversible aggregation, as well as fibrin clot retraction, but not soluble fibrinogen binding and reversible phase of platelet aggregation. CONCLUSION The cell-penetrating peptide myr-RKEFAK causes an inhibitory effect on integrin β3 outside-in signaling-regulated platelets functions, but did not affect inside-out signaling-regulated platelets functions.
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Affiliation(s)
- Zhang-Biao Long
- State Key Laboratory of Meidical Genomics and Shanghai Institute of Hematology. Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Jian-Song Huang
- State Key Laboratory of Meidical Genomics and Shanghai Institute of Hematology. Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Xiao-Feng Shi
- State Key Laboratory of Meidical Genomics and Shanghai Institute of Hematology. Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Ji-Chun Yang
- State Key Laboratory of Meidical Genomics and Shanghai Institute of Hematology. Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Zheng Ruan
- State Key Laboratory of Meidical Genomics and Shanghai Institute of Hematology. Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Bing Xiao
- State Key Laboratory of Meidical Genomics and Shanghai Institute of Hematology. Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
| | - Xiao-Dong Xi
- State Key Laboratory of Meidical Genomics and Shanghai Institute of Hematology. Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China. E-mail:
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Shi XF, Hu SD, Li JM, Luo XF, Long ZB, Zhu Y, Xi XD. Multimodal imaging and clinical characteristics of bone lesions in POEMS syndrome. Int J Clin Exp Med 2015; 8:7467-76. [PMID: 26221290 PMCID: PMC4509235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 04/13/2015] [Indexed: 03/24/2024]
Abstract
POEMS syndrome is a rare plasmacyte-associated disease, one of the major diagnostic criteria of which is sclerotic bone lesion. To detect bone lesions in POEMS syndrome, which imaging method should be routinely applied and what characteristics they display are still unconfirmed. We analyzed clinical data and imaging characteristics of bone lesions in 22 patients with POEMS using multimodal methods, including conventional X-ray, computed tomography (CT), magnetic resonance imaging (MRI), and positron emission tomography/computed tomography (PET/CT). Images on X-ray and CT exhibited plaque-like high-density for osteosclerotic lesions and punched-out low-density appearance for osteolytic ones. X-ray had advantage in detecting bone lesions in skull, extremity long bones, clavicle, and scapula, while CT could display sharp outline of lesions and was more sensitive than X-ray in detecting the small lesions. Osteosclerotic lesions on MRI demonstrated decreased signal intensity on both T1 and T2-weighted sequences, while osteolytic lesions or osteolytic part of mixed lesions showed high signal intensity on T2-weighted sequences. MRI had same sensitivity as CT, but with superiority in distinguishing the active osteolytic lesions from the osteosclerotic ones. PET-CT showed (18)F-FDG uptake was normal in the majority of osteosclerotic lesions, and slightly increased in mixed ones, but obviously elevated in osteolytic ones. PET/CT was less sensitive in detecting osteosclerotic lesions than in detecting osteolytic ones. In conclusion, to detect bone lesions in POEMS, conventional X-ray scan should be first performed, further followed by more sensitive CT or MRI. PET-CT is optional when the osteolytic lesions are suspected.
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Affiliation(s)
- Xiao-Feng Shi
- Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai 200025, China
- Department of Hematology, Affiliated Hospital of Jiangsu UniversityZhenjiang 212001, Jiangsu, China
| | - Shu-Dong Hu
- Department of Radiology, Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai 200025, China
- Department of Radiology, Affiliated Renmin Hospital of Jiangsu UniversityZhenjiang 212001, Jiangsu, China
| | - Jun-Min Li
- Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai 200025, China
| | - Xian-Fu Luo
- Department of Radiology, Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai 200025, China
| | - Zhang-Biao Long
- Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai 200025, China
| | - Yan Zhu
- Department of Hematology, Affiliated Hospital of Jiangsu UniversityZhenjiang 212001, Jiangsu, China
| | - Xiao-Dong Xi
- Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of MedicineShanghai 200025, China
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Li XY, Jiang LJ, Chen L, Ding ML, Guo HZ, Zhang W, Zhang HX, Ma XD, Liu XZ, Xi XD, Chen SJ, Chen Z, Zhu J. RIG-I modulates Src-mediated AKT activation to restrain leukemic stemness. Mol Cell 2014; 53:407-19. [PMID: 24412064 DOI: 10.1016/j.molcel.2013.12.008] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [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: 06/10/2013] [Revised: 10/14/2013] [Accepted: 12/05/2013] [Indexed: 01/09/2023]
Abstract
Retinoic acid (RA)-inducible gene I (RIG-I) is highly upregulated and functionally implicated in the RA-induced maturation of acute myeloid leukemia (AML) blasts. However, the underlying mechanism and the biological relevance of RIG-I expression to the maintenance of leukemogenic potential are poorly understood. Here, we show that RIG-I, without priming by foreign RNA, inhibits the Src-facilitated activation of AKT-mTOR in AML cells. Moreover, in a group of primary human AML blasts, RIG-I reduction renders the Src family kinases hyperactive in promoting AKT activation. Mechanistically, a PxxP motif in RIG-I, upon the N-terminal CARDs' association with the Src SH1 domain, competes with the AKT PxxP motif for recognizing the Src SH3 domain. In accordance, mutating PxxP motif prevents Rig-I from inhibiting AKT activation, cytokine-stimulated myeloid progenitor proliferation, and in vivo repopulating capacity of leukemia cells. Collectively, our data suggest an antileukemia activity of RIG-I via competitively inhibiting Src/AKT association.
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MESH Headings
- Adaptor Proteins, Signal Transducing/metabolism
- Adaptor Proteins, Signal Transducing/physiology
- Amino Acid Sequence
- Cell Line, Tumor
- DEAD Box Protein 58
- DEAD-box RNA Helicases/chemistry
- DEAD-box RNA Helicases/genetics
- DEAD-box RNA Helicases/physiology
- Enzyme Activation
- Humans
- Leukemia, Myeloid, Acute/genetics
- Leukemia, Myeloid, Acute/metabolism
- Models, Genetic
- Molecular Sequence Data
- Proto-Oncogene Proteins c-akt/metabolism
- Proto-Oncogene Proteins c-akt/physiology
- Proto-Oncogene Proteins pp60(c-src)/metabolism
- Proto-Oncogene Proteins pp60(c-src)/physiology
- Receptors, Immunologic
- Sequence Alignment
- Sequence Analysis, Protein
- TOR Serine-Threonine Kinases/metabolism
- TOR Serine-Threonine Kinases/physiology
- Up-Regulation
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Affiliation(s)
- Xian-Yang Li
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China; Shanghai E-Institute for Model Organisms, Shanghai 200025, People's Republic of China
| | - Lin-Jia Jiang
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China; Shanghai E-Institute for Model Organisms, Shanghai 200025, People's Republic of China
| | - Lei Chen
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China; Shanghai E-Institute for Model Organisms, Shanghai 200025, People's Republic of China
| | - Meng-Lei Ding
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China; Shanghai E-Institute for Model Organisms, Shanghai 200025, People's Republic of China
| | - He-Zhou Guo
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China; Shanghai E-Institute for Model Organisms, Shanghai 200025, People's Republic of China
| | - Wu Zhang
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China; Shanghai E-Institute for Model Organisms, Shanghai 200025, People's Republic of China
| | - Hong-Xin Zhang
- Shanghai E-Institute for Model Organisms, Shanghai 200025, People's Republic of China
| | - Xiao-Dan Ma
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China
| | - Xiang-Zhen Liu
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China
| | - Xiao-Dong Xi
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China
| | - Sai-Juan Chen
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China
| | - Zhu Chen
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China
| | - Jiang Zhu
- State Key Laboratory for Medical Genomics and Shanghai Institute of Hematology, Rui-Jin Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai 200025, People's Republic of China; Shanghai E-Institute for Model Organisms, Shanghai 200025, People's Republic of China.
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11
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Cui XY, Shi XF, Huang JS, Liu P, Tao LL, Zhou YL, Ruan Z, Xi XD. [Transgenic mouse models of the truncated platelet integrin β3 cytoplasmic tail established by stem cell transplantation]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2013; 21:667-73. [PMID: 23815919 DOI: 10.7534/j.issn.1009-2137.2013.03.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study was purpose to establish the transgenic mouse models of the truncated platelet integrin β3 by retrovirus-infected hematopoietic stem cells (HSCs) transplantation and to provide the basis for further study of the role of integrin β3 cytoplasmic domain in platelet bi-directional signaling pathways. Wild-type β3, β3-Δ759 (R(760) GT(762) truncated β3) and β3-Δ754 (T(755) NITYRGT(762) truncated β3) cDNAs were subcloned into MSCV MigR1 retroviral vector bearing a GFP gene and packaged into infective retrovirus with BOSC23 cell strain. The bone marrow HSCs of the β3 deficient mice were infected by the retroviruses, and transplanted into lethally-irradiated wild type C57BL/6 mice. GFP positive rate and surface β3 expression of the recipients' platelets at 6 to 8 weeks after transplantation were detected by flow cytometry to evaluate the transgenic efficiency. The results showed that four kinds of transgenic mouse models including vector, wild-type β3, β3-Δ759 and β3-Δ754 were established successfully. GFP positive rates of transgenic mouse platelets ranged from 18% to 66% and the β3 expression of transgenic mouse reached heterozygote (β3(+/-) level of mouse). It is concluded that establishment of transgenic mouse models mediated by retrovirus-infected HSCs transplantation is a feasible, fast, and high throughput transgenic approach and laid a solid foundation for further research on the role of integrin β3 cytoplasmic domain for bi-directional signaling of platelets in vivo, and for the gene therapy of platelet disorders.
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Affiliation(s)
- Xiong-Ying Cui
- Shanghai Jiaotong University School of Medicine, Shanghai, China
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12
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You GL, Ding QL, Lu YL, Dai J, Xi XD, Wang XF, Wang HL. Characterization of large deletions in the F8 gene using multiple competitive amplification and the genome walking technique. J Thromb Haemost 2013; 11:1103-10. [PMID: 23551875 DOI: 10.1111/jth.12205] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [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: 11/07/2012] [Accepted: 03/15/2013] [Indexed: 11/29/2022]
Abstract
BACKGROUND Large deletions in the F8 gene are responsible for approximately 3% of severe hemophilia A (HA) cases. However, only a few breakpoints in large deletions have been characterized. OBJECTIVES To identify large deletions in the F8 gene and to characterize the molecular mechanisms leading to these deletions. PATIENTS AND METHODS We used AccuCopy technology, a copy number variation (CNV) genotyping method based on multiplex competitive amplification, to confirm deletions in index patients and to screen potential female carriers in 10 HA families. Also, breakpoints of these large deletions were characterized by a primer walking strategy and genome walking technique. RESULTS Ten large deletions and four female carriers were identified by AccuCopy. The extents of deleted regions ranged from 1.3 to 68.5 kb. Exact breakpoints of these deletions were successfully characterized. Eight of them presented microhomologies at breakpoint junctions and several recombination-associated elements (repetitive elements, non-B conformation forming motifs and sequence motifs) were also observed in close proximity to the junctions. CONCLUSIONS AccuCopy technology is a reliable and efficient tool for detecting large deletions in the F8 gene and identifying HA female carriers. The genome walking technique is a highly specific, efficient and versatile method for characterizing the deletion breakpoints. Molecular characterization of deletion breakpoints revealed that non-homologous end joining and microhomology-mediated replication-dependent recombination were the major causative mechanisms of the 10 large deletions in the F8 gene.
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Affiliation(s)
- G L You
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
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13
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Xia Y, Lu QY, Lu YL, Dai J, Ding QL, Wang XF, Xi XD, Wang HL. Molecular basis of type I antithrombin deficiency in two women with recurrent venous thromboembolism in the first trimester of pregnancy. Blood Cells Mol Dis 2012; 48:254-9. [DOI: 10.1016/j.bcmd.2012.02.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Revised: 02/15/2012] [Accepted: 02/16/2012] [Indexed: 11/25/2022]
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14
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Kong YK, Zhang Y, Lin MH, Xi XD. [A single E726Q mutation in the membrane proximal α-helix of integrin β3 subunit induces membrane blebbing by disrupting the membrane-actin cortex interaction]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2011; 19:1450-1455. [PMID: 22169302] [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: 05/31/2023]
Abstract
The membrane proximal α helix of integrin β subunit cytoplasmic tails plays an important functional role by interacting with various intracellular proteins, namely talin, α-actinin or skelemin. This study was designed to investigate the functional role of 5 highly conserved charged amino acids (R(724), K(725), E(726), E(731), E(733)) within this α helix by site-directed mutagenesis. The result showed that CHO cells expressing the αIIbβ3E726Q mutant had the most prominent phenotype and characterized by defective cell spreading on immobilized fibrinogen. In addition, this E726Q mutation induced membrane blebbing in cells adherent on fibrinogen, and this blebbing could be inhibited by the myosin light chain ATPase inhibitor blebbistatin. It is concluded that the membrane proximal α-helix of integrin β3 subunit is important in linking the phospholipid membrane to the submembraneous actin cortex.
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Affiliation(s)
- Yong-Kui Kong
- Shanghai Institute of Hematology, Shanghai Jiaotong University School of Medicine, Shanghai, China
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15
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Du TJ, Wu QP, Liu HX, Chen X, Shu YN, Xi XD, Zhang QS, Li YZ. An atom-efficient and powerful method for direct esterification of silyl ethers catalyzed by HClO4–SiO2. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.12.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Huang DD, Wang XF, Chen HY, Xu GQ, Zhang LW, Dai J, Lu YL, Ding QL, Xi XD, Wang HL. [Analysis of phenotype and genotype in four Chinese pedigrees with inherited coagulation factor V deficiency.]. Zhonghua Xue Ye Xue Za Zhi 2010; 31:149-153. [PMID: 20510101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
OBJECTIVE To identify the phenotype and genotype in four Chinese pedigrees with inherited coagulation factor V (FV) deficiency. METHODS The tests of activated partial thromboplastin time (APTT), prothrombin time (PT), FV activity (FV:C) and FV antigen (FV:Ag) were used for phenotype diagnosis. All the exons and exon-intron boundaries of F5 gene were amplified by PCR and analyzed by direct sequencing. RESULTS The APTT and PT in each of the four probands were obviously prolonged, and both activity and antigen of FV in the four probands were extremely lower compared with that of normal mixed plasma. Sequencing of F5 gene in proband 1 identified a heterozygous mutation, G16088C (Asp68His), and four polymorphisms, T35788C (Met385Thr), A47295G (His1299Arg), A58668G (Met1736Val) and A74083G (Asp2194Gly), which were located in the same chromosome; proband 2 was homozygous for two mutations, C46253T (Arg952Cys) and C46724T(Gln1109stop); the F5 gene of proband 3 showed a homozygous missense mutation, C67793G(Pro2006Ala); and proband 4 was homozygous for one missense mutation, C74022T (Arg2174Cys). CONCLUSION Five mutations (Asp68His, Arg952Cys, Gln1109stop, Pro2006Ala and Arg2174Cys) and four polymorphisms (Met385Thr, His1299Arg, Met1736Val and Asp2194Gly) may lead to type I inherited FV deficiency for these four probands, respectively. Gln1109stop, Pro2006Ala and Arg2174Cys haven't been identified before.
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Affiliation(s)
- Dan-Dan Huang
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital of Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
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17
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Chen Q, Lu YL, Xu GQ, Ding QL, Wang XF, Xi XD, Wang HL. [Two new mutations of AT gene in type I inherited antithrombin deficiency.]. Zhonghua Xue Ye Xue Za Zhi 2010; 31:145-148. [PMID: 20510100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
OBJECTIVE To identify the clinical phenotype and gene mutation in two kindreds with type I inherited antithrombin (AT) deficiency. METHODS The coagulation and anticoagulation testing and thrombophilia screening were used for phenotypic diagnosis and immunonephelometry and chromogenic assay for plasma level of AT antigen (AT:Ag) and AT activity (AT:A), respectively. All of the seven exons and intron-exon boundaries and untranslation regions of AT gene were amplified by PCR, and the PCR products analysis was by direct sequencing. The corresponding gene sites of the two family members and healthy individuals were detected according to the gene mutation sites. RESULTS The plasma levels of AT:Ag of proband 1 and proband 2 were 126 mg/L and 117 mg/L, and AT:A was 49% and 48%, respectively. Heterozygotic deletion of 3239-3240delCT in proband 1 and nonsense mutation 3206A-->T (K70Stop) in proband 2 were rchaacterized in exon 2 of AT gene. And some of their family members were also detected with the heterozygotic gene mutation. CONCLUSION Type I inherited antithrombin deficiency of the two probands were caused by AT gene mutation 3239-3240delCT and 3206A-->T (K70Stop).
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Affiliation(s)
- Qiong Chen
- State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital of Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
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18
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Liu HX, Wu QP, Shu YN, Chen X, Xi XD, Du TJ, Zhang QS. A mild, efficient, and selective procedure for transprotection of acetonides to acetates catalyzed with HClO4–SiO2. Carbohydr Res 2009; 344:2342-8. [DOI: 10.1016/j.carres.2009.08.035] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2009] [Revised: 07/24/2009] [Accepted: 08/27/2009] [Indexed: 10/20/2022]
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19
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Lu YJ, Su XY, Ruan Z, Xi XD. [Study of signal transduction mediated by integrin alphaIIbbeta3 using a dominant negative model]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2009; 17:1026-1031. [PMID: 19698252] [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: 05/28/2023]
Abstract
This study was purposed to investigate the role of integrin beta3 cytoplasmic domain in signal transduction mediated by integrin alphaIIbbeta3 and to explore the effect of integrin beta3 on signal transduction and specificity in condition without alphaIIb subunit. The fusion protein (Tac/beta3) was stably expressed in CHO cell line expressing GPIbIX, integrin alphaIIbbeta3 (IbIX/IIbIIIa-CHO cell line) by combining extracellular and transmembrane domains (Tac) of IL-2 receptor with integrin beta3 cytoplasmic domain (beta3) for formation of fusion protein (Tac/beta3). Then a series of tests were performed, including spreading and stable adhesion of IbIX/IIbIIIa-CHO cell line in solid phase fibrinogen (Fg), fibrin clot restriction and soluble fibrinogen binding, which represent outside-in and inside-out signal transduction events. The results showed that the bidirectional signal transduction mediated by alphaIIbbeta3 in IbIX/IIbIIIa-CHO/Tac-762 cells stably expressing Tac/beta3 was seriously inhibited. It is concluded that the Tac/beta3 can play a significant role in IbIX/IIbIIIa-CHO/Tac-762 cells through a dominant negative mode, the independent presence of beta3 subunit cytoplasmic domain can regulate the bidirectional signal transduction mediated by integrin alphaIIbbeta3.
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Affiliation(s)
- Yuan-Jing Lu
- National Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Ruijin Hospital, Shanghai Jiaotong University Medicial College, Shanghai 200025, China
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20
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Xi XD, Shi DX, Li H, Li YZ, Wu QP. 4,5,6-Tri-O-acetyl-2,3-di-S-ethyl-2,3-dithio-d-allose diethyl dithio-acetal. Acta Crystallogr Sect E Struct Rep Online 2009; 65:o1227. [PMID: 21583095 PMCID: PMC2969703 DOI: 10.1107/s1600536809015694] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2009] [Accepted: 04/27/2009] [Indexed: 11/26/2022]
Abstract
The title compound, C20H36O6S4, was obtained by ethanethiolysis of 3,5,6-tri-O-acetyl-1,2-O-isopropylidene-α-d-glucofuranose. One of the ethyl groups is disordered over two sites with refined occupancies of 0.869 (6) and 0.131 (6). Compared with the precursor, the absolute configuration of the stereocenters at positions C-3 and C-2 are inverted and maintained, respectively.
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21
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Wu QP, Zhou MX, Xi XD, Song D, Wang Y, Liu HX, Li YZ, Zhang QS. A facile one-pot procedure for the transformation of acetonides into diacetates catalyzed with Bi(OTf)3·xH2O. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.02.163] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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22
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Jin PP, Shen WZ, Yang F, Ding QL, Wang XF, Xi XD, Wang HL. [Analysis of clinical features and genotype in three Chinese pedigrees with Glanzmann thrombasthenia]. Zhonghua Xue Ye Xue Za Zhi 2008; 29:149-153. [PMID: 18788610] [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: 05/26/2023]
Abstract
OBJECTIVE To study the clinical feature and alpha II b beta 3 gene mutations of three Glanzmann thrombasthenia (GT) pedigrees. METHODS Platelet counts (BPC), blood film, bleeding time, platelet aggregation and flow cytometry were used for phenotype diagnosis of all the patients. All the exons of alpha II b and beta 3 genes were amplified by polymerase chain reaction (PCR) and direct sequencing was performed for mutational screening. One hundred and three healthy blood donors were as normal controls. RESULTS Three probands showed normal BPC, defective platelets aggregation, prolonged bleeding time and significantly reduced platelet aggregation to ADP, epinephrine, and collagen, while relatively normal aggregation to ristocetin. Flow cytometry showed platelet surface expressed alpha II b beta 3 was strongly reduced in proband 1 and proband 3 and mildly reduced in the amount of surface expressed alpha II b beta 3 (63%) in proband 2. Sequencing results showed that proband 1 had a G10A homozygous mutation in alpha II b, and a G1412T homozygous mutation in beta3. Compound heterozygous mutations in beta3, G1199A and 1525delC were identified in proband 2. No mutations in alpha II b beta 3 gene were identified in proband 3. CONCLUSIONS Compound homozygous mutations, GI0A in alpha II b and G1412T in beta3, lead to GT in proband 1. Compound heterozygous mutations in beta3, G1199A and 1525delC, lead to GT in proband 2. The mutations of G10A, G1412T and 1525delC were reported for the first time in GT patients.
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Affiliation(s)
- Pei-Pei Jin
- Clinical Transfusion Department, Shanghai Institute of Hematology, Ruijin Hospital, Medical College of Shanghai Jiaotong University, Shanghai 200025, China
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23
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Chen HY, Ding QL, Zhang LW, Xu GQ, Dai J, Wang XF, Xi XD, Wang HL. [The application of thrombin generation tests to warfarin anticoagulation monitoring]. Zhonghua Xue Ye Xue Za Zhi 2008; 29:168-170. [PMID: 18788615] [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: 05/26/2023]
Abstract
OBJECTIVES To explore the thrombin generation capacity in patients on warfarin therapy with different prothrombin time international normalized ratio (PT-INR), the capacity in relation to bleeding, and the application of thrombin generation tests to warfarin therapy monitoring. METHODS Seventy eight blood samples were taken from patients on warfarin therapy for more than 3 months owing to valve replacement or atrial fibrillation. The patients' case history and PT-INR were collected and thrombin generation tests were performed in all samples. RESULTS Patients were ranked into three groups according to different PT-INR. There were 23 patients in group I with PT-INR from 1.51 to 2.00, 39 patients in group II with PT-INR from 2.01 to 3.00, and 16 patients in group III with PT-INR from 3.01 to 4.26. There were significant differences between each two of the three groups in lag time, peak, and ttpeak (time to peak) (P <0.01). There was a significant difference between group I and group II in endogenous thrombin potential (ETP) (P = 0.0001), but not between group II and group III (P= 0.06). Five patients developed bleeding and their ETP was less than 15% of normal control. CONCLUSION In patients on warfarin therapy, when the PT-INR was more than 3.0, increasing the dose of warfarin doesn' t decrease the thrombin generation, but increase bleeding risk. PT-INR combined with ETP may better reflect patient's coagulation status, therefore be of more significance in preventing bleeding.
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Affiliation(s)
- Hua-Yun Chen
- Clinical Transfusion Department, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai 200025, China
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24
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Bai XT, Gu BW, Yin T, Niu C, Xi XD, Zhang J, Chen Z, Chen SJ. Trans-Repressive Effect of NUP98-PMX1 on PMX1-Regulated c-FOSGene through Recruitment of Histone Deacetylase 1 by FG Repeats. Cancer Res 2006; 66:4584-90. [PMID: 16651408 DOI: 10.1158/0008-5472.can-05-3101] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The formation of fusion genes between NUP98 and members of the HOX family represents a critical factor for the genesis of acute leukemia or acute transformation of chronic myeloid leukemia (CML). To gain insights into the molecular mechanisms underlying the leukemogenesis of NUP98-HOX fusion products, we cloned NUP98-PMX1 from a CML-blast crisis patient with t(1;11) as a secondary chromosomal translocation, and functionally studied the fusion products in detail through various molecular and protein biochemical assays. In addition to many interesting features, we have found that the NUP98-PMX1 fusion protein exerts a repressive effect on PMX1 or serum response factor-mediated c-FOS activation, probably through the recruitment of a common corepressor histone deacetylase 1 by FG domains of the NUP98-PMX1 fusion protein. Moreover, we have provided evidence that the FG domains of NUP98-PMX1 and two other NUP98-containing fusion proteins, i.e., NUP98-HOXA9 and NUP98-HOXC11, all exhibit dual binding ability to both CREB binding protein, a coactivator, and histone deacetylase 1, a corepressor. Accordingly, we have hypothesized that this dual binding activity is shared by most, if not all, NUP98-HOX-involved fusion proteins, enabling these fusion proteins to act as both trans-activators and trans-repressors, and contributing to the genesis of acute leukemia or acute transformation of CML.
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MESH Headings
- Binding Sites
- Blast Crisis
- Cell Nucleus/genetics
- Cell Nucleus/metabolism
- Cloning, Molecular
- Gene Expression Regulation, Leukemic
- Genes, fos
- Histone Deacetylase 1
- Histone Deacetylases/metabolism
- Humans
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/genetics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/metabolism
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/pathology
- Male
- Middle Aged
- Nuclear Pore Complex Proteins/genetics
- Nuclear Pore Complex Proteins/metabolism
- Oncogene Proteins, Fusion/genetics
- Oncogene Proteins, Fusion/metabolism
- Protein Structure, Tertiary
- Transcriptional Activation
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Affiliation(s)
- Xue-Tao Bai
- State Key Laboratory of Medical Genomics and Shanghai Institute of Hematology, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, P.R. China
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25
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Bai X, Fu JX, Xi XD, Ruan CG. [Establishment of urokinase receptor gene antisense RNA transfer system and its application in leukemia research]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2003; 11:591-4. [PMID: 14706141] [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: 04/27/2023]
Abstract
Overexpression of urokinase-type plasminogen activator receptor (uPAR) on tumor cell surface is essential for invasion and metastasis in a variety of tumor cells. To establish a retroviral-mediated antisense RNA transfer system of uPAR gene for exploring its function on down-regulation of uPAR expression in leukemia cells, the retroviral vector LaCD87SN was constructed by inserting uPAR gene into LXSN vector in an antisense orientation. An uPAR gene antisense RNA transfer system was established by liposome-mediated transfection in combination with cross infection with retrovirus. Human leukemia cells U937 were transduced with aCD87 amphotropic retrovirus, expressing uPAR antisense RNA, and the U937/aCD87 cells was obtained by G418 selection. The integration and expression of antisense uPAR gene were analyzed by polymerase chain reaction (PCR) assay. The cell surface expression of CD87 and the activities of matrix metalloproteinase (MMP) were assayed by flow cytometry (FCM) and gelatin zymography, respectively. The results showed that the amphotropic retroviral producers Am12/aCD87, which expressed antisense RNA of uPAR gene with a titer of 6.3 x 10(5) cfu/ml in supernatants, were obtained by means of transfection and superinfection. U937/aCD87 cells were established by continuative G418 selection after retrovirus infection. In U937/aCD87 cells, the integrated provirus and the overexpression of antisense uPAR gene was confirmed. Compared with U937/NeoR cells, FCM analysis revealed that CD87 expression on U937/aCD87 cell surface was not downregulated significantly. However, MMP-9 secretion was significantly suppressed in U937/aCD87 cells. In conclusion, although the retroviral-mediated antisense RNA transfer could not efficiently suppress uPAR expression on leukemic cell surface, it may interfere the uPAR-MMP interactions.
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Affiliation(s)
- Xia Bai
- Jiangsu Institute of Hematology, The First Affiliated Hospital of Suzhow University, Suzhou 215006, China
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Han ZC, Zhang XJ, Xi XD, Lu M, Jiang S, Jiang LZ, Wang XM, Gu GL, Caen JP. [Platelet factor 4 acts as both inhibitor and protector of hematopoietic precursor cells: possible mechanism of action]. Shi Yan Sheng Wu Xue Bao 1995; 28:415-26. [PMID: 8731973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
We have previously shown that platelet factor 4 (PF 4) is a potent inhibitor of megakaryocytopoiesis and that it may protect stem cells from 5-fluorouracil (5-FU) cytotoxicity. In the present work, the effects of human PF 4 on megakaryocyte (MK) growth from human CD34+ cord blood (CB) cells were studied in comparison with transforming growth factor beta 1 (TGF-beta 1). Development of MK from CD34+ cells in both plasma clot culture and liquid culture was significantly inhibited by PF 4 (5 micrograms/ml) and TGF beta 1 (1 ng/ml). Inhibition of cell growth by PF 4 was reversible judging from the fact that the CD34+ cells preincubated with PF 4 could regenerate colonies after washing and replating into the cultures. By contrast, TGF-beta 1 pretreated CD34+ cells gave rise to few colonies following replating. Moreover, incubation of CD34+ cells with PF 4 in liquid culture caused an increase in the number of both stem cell factor (SCF)-binding cells and CD34 antigen-bearing cells, and exhibited greater capacity to form MK colonies than control after the treatment of 5-FU. In vivo in mice, twice injections of PF 4 at 40 micrograms/kg with an interval of 6 h followed by one injection of 5-FU at 150 mg/kg resulted in a significant increase in the number of colony-forming cells with high proliferative potential (HPP-CFC) and colony-forming unit-megakaryocyte (CFU-MK) in bone marrow. In exponentially growing human erythroleukemia cells (HEL), the addition of PF 4 prolonged cell cycle progression and therefore resulted in an increased cell population in S phase, as determined by flow cytometric analysis. Different from PF 4, TGF-beta 1 blocked more cells in G 1 phase. These results demonstrate that PF 4 and TFG-beta 1 inhibit MK development from CD34+ CB cells by different mechanisms and suggest that PF 4, unlike TGF-beta 1, exerts its inhibitory effect on cell growth in a reversible and S phasespecific manner by which it protects stem cells and MK progenitor cells from 5-FU cytotoxicity.
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Affiliation(s)
- Z C Han
- Shanghai Institute of Cell Biology, Academia Sinica
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Shen ZX, Basara N, Xi XD, Caen J, Maffrand JP, Pascal M, Petitou M, Lormeau JC, Han ZC. Fraxiparin, a low-molecular-weight heparin, stimulates megakaryocytopoiesis in vitro and in vivo in mice. Br J Haematol 1994; 88:608-12. [PMID: 7819073 DOI: 10.1111/j.1365-2141.1994.tb05080.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [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: 01/27/2023]
Abstract
The effect of a low-molecular-weight heparin, faxiparin (Nadroparin), on murine megakaryocytopoiesis in vitro and in vivo was studied in comparison with unfractionated heparin. The addition of fraxiparin at 1-20 IU/ml into plasma clot cultures but not serum-free agar culture significantly enhanced MK colony growth. Furthermore, fraxiparin was found to potentiate the stimulating activity of aplastic anaemia serum (AAS) but not stem cell factor (SCF), interleukin-3 (IL-3), granulocyte-macrophage colony-stimulating factor (GM-CSF) and erythropoietin (Epo), on MK colony growth in vitro, and to neutralize the inhibitory effect of platelet factor 4 (PF4) in vitro and in vivo. Fraxiparin also acted synergistically with heparin cofactor II and antithrombin III to promote megakaryocyte colony formation. Intraperitoneal administration of fraxiparin twice daily for 4 d at 0.1-25 IU/injection increased in mice the level of blood platelet counts and the number of single MKs and CFU-MK in bone marrow. These data demonstrate that fraxiparin is able to positively regulate megakaryocytopoiesis.
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Affiliation(s)
- Z X Shen
- Institut des Vaisseaux et du Sang, Hôpital Lariboisière, Paris, France
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Xia LJ, Li PX, Zhao YM, Wang QC, Xi XD, Ruan CG. Antifibrin monoclonal antibodies for the detection of venous thrombosis. Chin Med J (Engl) 1994; 107:483-6. [PMID: 7956492] [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: 01/28/2023] Open
Abstract
In order to specifically detect the localization of thrombus in vivo, we have recently developed two monoclonal antibodies (SZ-58, SZ-63) which can specifically bind to cross-linked fibrin. The binding rates of the two monoclonal antibodies (MoAbs) to human plasma clots in vitro were 46.4 +/- 2.3% for 125I-SZ-58, 50.1 +/- 1.7% for 125I-SZ-63 and 3.4 +/- 1.6% for 125I-SZ-53 (control, MoAb against TM). It was shown that both SZ-58 and SZ-63 possess properties of inhibiting the polymerization of fibrin, and SZ-58 could also inhibit the aggregation of platelets induced by ADP. These characteristics make the two MoAbs suitable in the detection of thrombus in vivo. According to the cross reaction tests, thrombi in the jugular veins and carotid arteries in rabbits were made. After injection of the 125I-labeled MoAbs (100,000 cpm/ml of blood), the thrombi and the blood were taken and weighed at various time intervals and radioactivities were measured by an autogamma counter. The ratios of thrombus to blood radioactivity (T/B) of thrombi in jugular veins were 3.0, 5.6 and 3.0 for 125I-SZ-58, 1.5, 3.0 and 5.2 for 125I-SZ-63 and 1.2, 1.0 and 0.7 for control (125I-SZ-53) at the 3rd, 12th and 24th hour after the injection of the radiolabled MoAbs, while the radioactivities of arterial thrombi were almost the same as that in blood after the injection of the two radiotracers. Therefore, it can be concluded that both SZ-58 and SZ-63 can be used in venous thrombus imaging in vivo and the optimal times of imaging are at the 12th hour for SZ-58, 24th hour for SZ-63 after the injection of the radiolabled MoAbs.
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Affiliation(s)
- L J Xia
- Jiangsu Institute of Hematology, Suzhou Medical College
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Wu QY, Ruan CG, Xi XD. [A study on monoclonal antibodies against porcine aortic endothelial cells]. Zhonghua Xin Xue Guan Bing Za Zhi 1987; 15:175-7, 191. [PMID: 3436251] [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: 01/05/2023]
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Ruan CG, Xi XD, Du XP, Wan HY, Wu X, Li PX, Gu JM. Studies on monoclonal antibodies against human platelets--a monoclonal antibody to human platelet glycoprotein I--SZ-2. Sci Sin B 1987; 30:404-12. [PMID: 3659897] [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: 01/06/2023]
Abstract
A monoclonal antibody, SZ-2, reacts specifically on human platelets and megakaryocytes. The platelets from 10 normal donors are bound to 15,200 +/- 4,100 SZ-2 molecules/platelet. The antigen recognized by SZ-2 is chymotrypsin-sensitive but neuraminidase-insensitive, and has been identified as glycoprotein Ib (GPIb) by an affinity chromatography technique. SZ-2 is different from other monoclonal antibodies to GPIb. It inhibits not only platelet aggregation induced by ristocetin, but also platelet aggregation induced by collagen (type I) and by PAF. SZ-2 also inhibits platelet serotonin and beta-thromboglobulin release in response to these stimuli.
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Affiliation(s)
- C G Ruan
- Thrombosis and Haemostasis Research Unit, Suzhou Medical College
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Ruan CG, Du XP, Xi XD, Castaldi PA, Berndt MC. A murine antiglycoprotein Ib complex monoclonal antibody, SZ 2, inhibits platelet aggregation induced by both ristocetin and collagen. Blood 1987; 69:570-7. [PMID: 3801672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
A new monoclonal antibody (MoAb), SZ 2, reactive with the human platelet glycoprotein Ib complex has been produced by the hybridoma technique. SZ 2 immunoprecipitated the components of the glycoprotein Ib complex, glycoprotein Ib and glycoprotein IX, from Triton-X-100-solubilized, periodate-labeled platelets. Western blot analysis indicated that the epitope for SZ 2 was on the alpha-subunit of glycoprotein Ib. Scatchard analysis of SZ 2 binding to formaldehyde-fixed, washed platelets revealed a single class of binding sites with Kd = 6.6 +/- 3.3 X 10(-10) mol/L and 15,200 +/- 4,100 binding sites per platelet (mean +/- SD, n = 10). Intact antibody and its purified (Fab')2 fragments not only inhibited the ristocetin-dependent binding of von Willebrand factor to platelets and ristocetin-induced platelet agglutination but also inhibited platelet aggregation induced by Type I collagen and platelet-activating factor (PAF). SZ 2 inhibited platelet serotonin and beta-thromboglobulin release in response to these stimuli and also platelet thromboxane A2 formation in response to ristocetin and collagen. SZ 2 was without effect on platelet aggregation or release in response to other platelet stimuli such as ADP, thrombin, or arachidonic acid. The inhibition by SZ 2 of collagen- and PAF-induced platelet aggregation is surprising in that Bernard-Soulier syndrome platelets, which lack the glycoprotein Ib complex, respond normally to both these stimuli. SZ 2 was unreactive toward Bernard-Soulier syndrome platelets, as evaluated by fluorescence-associated cell sorting, and had no effect on the collagen- and PAF-induced aggregation of Bernard-Soulier syndrome platelets. The combined results suggest that the inhibition by SZ 2 of collagen- and PAF-induced aggregation of normal platelets is steric and are consistent with the glycoprotein Ib complex and the platelet collagen and PAF receptor(s) being adjacent in the human platelet plasma membrane.
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Ruan CG, Xi XD, Gu JM. [Studies on monoclonal antibodies to human von Willebrand factor]. Zhonghua Nei Ke Za Zhi 1986; 25:547-50, 576. [PMID: 3492345] [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: 01/06/2023]
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