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Gao ZD, Yan HD, Wu NH, Yao Q, Wan BB, Liu XF, Zhang ZW, Chen QJ, Huang CP. Mechanistic insights into the amelioration effects of lipopolysaccharide-induced acute lung injury by baicalein: An integrated systems pharmacology study and experimental validation. Pulm Pharmacol Ther 2022; 73-74:102121. [PMID: 35283292 DOI: 10.1016/j.pupt.2022.102121] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Revised: 02/10/2022] [Accepted: 02/20/2022] [Indexed: 11/24/2022]
Abstract
BACKGROUND Acute lung injury is an acute progressive respiratory failure caused by several of non-cardiogenic factors which involves in excessive amplification or uncontrolled inflammatory response. OBJECTIVES In this study, we investigated the protective effect of baicalein against acute lung injury induced by LPS and explored the underlying mechanisms. METHODS Forty-eight SPF male C57BL/6 mice were randomly divided into normal group, model group, dexamethasone group and baicalein low-dose, medium-dose and high-dose groups. After 5 days of adaptive feeding, the mice were intraperitoneally injected with LPS and dissected after 12 h. Hematoxylin-eosin staining, ELISA assay, immunofluorescence assay and Western-Blot were applied to appraise microstructural changes and protein expressions of lung tissues. Systems pharmacology study was used to evaluate the protection of baicalein on acute lung injury. FINDINGS The results showed that baicalein administration could significantly inhibit LPS-induced lung morphological changes, inhibit inflammatory response and pyroptosis. A total of forty-three potential targets of baicalein and acute lung injury were obtained. And PI3K-Akt, TNF and NF-κB were mainly signaling pathways. It is worth mentioning that this experiment also confirmed that NLRP3, caspase-1 and other inflammasome are involved in pyroptosis. CONCLUSION Baicalein has protected against LPS-induced lung tissues injury via inhibiting inflammatory response and pyroptosis.
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Affiliation(s)
- Zhi-Dan Gao
- School of Pharmacy, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China; Hubei Key Laboratory of Diabetes and Angiopathy, Medicine Research Institute, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China; School of Medicine and Health Sciences, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China
| | - Hai-Dong Yan
- Ward 2 of Gastrointestinal Surgery, Xianning Central Hospital, The First Affliated Hospital, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China
| | - Ning-Hua Wu
- School of Basic Medical Sciences, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China
| | - Qing Yao
- Hubei Key Laboratory of Diabetes and Angiopathy, Medicine Research Institute, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China
| | - Bin-Bin Wan
- Hubei Key Laboratory of Diabetes and Angiopathy, Medicine Research Institute, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China
| | - Xiu-Fen Liu
- Hubei Key Laboratory of Diabetes and Angiopathy, Medicine Research Institute, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China
| | - Zhen-Wang Zhang
- Hubei Key Laboratory of Diabetes and Angiopathy, Medicine Research Institute, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China
| | - Qing-Jie Chen
- Hubei Key Laboratory of Diabetes and Angiopathy, Medicine Research Institute, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China.
| | - Cui-Ping Huang
- School of Medicine and Health Sciences, Xianning Medical College, Hubei University of Science and Technology, Xiannning, 437100, PR China.
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Shan DD, Wu NH, Wang Q, Ren WW, Zhu AQ, Wang LF, Liu YQ, Sun LP, Guo LH, Xu HX. Value of pseudopod sign on high-frequency ultrasound in predicting the pathological invasion of extramammary Paget's disease lesions. J Eur Acad Dermatol Venereol 2022; 36:1235-1245. [PMID: 35344636 DOI: 10.1111/jdv.18104] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 11/20/2021] [Accepted: 03/04/2022] [Indexed: 12/07/2022]
Abstract
BACKGROUND Vertical invasion of extramammary Paget's disease (EMPD) is associated with poor prognosis. The usual vertical invasion route is directly downward or along the skin appendages. High-frequency ultrasound (HFUS) can be used to measure the EMPD lesion thickness, and visualize the pseudopod extensions due to skin appendage involvement. It is a non-invasive method for evaluating the extent of vertical invasion in EMPD. OBJECTIVE To investigate the value of HFUS in predicting the extent of vertical invasion in EMPD. METHODS In this retrospective study, 85 patients with EMPD were divided into two groups based on the pathology: invasive EMPD (iEMPD) group (n = 13) and in situ EMPD group (n = 72). The clinical and HFUS features of both the groups were analyzed. The different types of pseudopodia morphology on HFUS were as follows: no pseudopodia, irregular bottom, small sphere, short strip, long strip, vase shape, and nodular convex. These were further stratified into low-risk and high-risk levels. RESULTS The clinical features were comparable between the two groups (P > .05). There were significant differences between the two groups in the HFUS features (lesion thickness, lesion shape, bottom shape, layer involvement, pseudopodia morphology, and color Doppler blood flow signal; all P < .05). The distribution of the pseudopodia morphology types in the in situ EMPD and iEMPD groups, was as follows: no pseudopodia, 30/72 and 0/13; irregular bottom, 5/72 and 0/13; small sphere, 5/72 and 0/13; short strip, 21/72 and 0/13; long strip, 8/72 and 3/13; vase shape, 3/72 and 3/13; and nodular convex, 0/72 and 7/13 (P < .05 for all). The sensitivity and specificity of high-risk pseudopodia in identifying iEMPD were 100% and 84.7%, respectively. CONCLUSIONS HFUS provides morphological information regarding EMPD lesions. Risk stratification for pseudopodia can help to distinguish between iEMPD and in situ EMPD lesions.
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Affiliation(s)
- D D Shan
- Department of Medical Ultrasound, Shanghai Skin Disease Hospital, Ultrasound Research and Education Institute, School of Medicine, Tongji University, Shanghai, China.,Center of Minimally Invasive Treatment for Tumor, Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Shanghai, China.,Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment, National Clinical Research Center for Interventional Medicine, Shanghai, China.,Ultrasound Research and Education Institute, Clinical Research Center for Interventional Medicine, School of Medicine, Tongji University, Shanghai, China
| | - N H Wu
- Department of Pathology, Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai, China
| | - Q Wang
- Department of Medical Ultrasound, Shanghai Skin Disease Hospital, Ultrasound Research and Education Institute, School of Medicine, Tongji University, Shanghai, China.,Center of Minimally Invasive Treatment for Tumor, Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Shanghai, China.,Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment, National Clinical Research Center for Interventional Medicine, Shanghai, China.,Ultrasound Research and Education Institute, Clinical Research Center for Interventional Medicine, School of Medicine, Tongji University, Shanghai, China
| | - W W Ren
- Department of Medical Ultrasound, Shanghai Skin Disease Hospital, Ultrasound Research and Education Institute, School of Medicine, Tongji University, Shanghai, China.,Center of Minimally Invasive Treatment for Tumor, Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Shanghai, China.,Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment, National Clinical Research Center for Interventional Medicine, Shanghai, China.,Ultrasound Research and Education Institute, Clinical Research Center for Interventional Medicine, School of Medicine, Tongji University, Shanghai, China
| | - A Q Zhu
- Department of Medical Ultrasound, Shanghai Skin Disease Hospital, Ultrasound Research and Education Institute, School of Medicine, Tongji University, Shanghai, China.,Center of Minimally Invasive Treatment for Tumor, Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Shanghai, China.,Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment, National Clinical Research Center for Interventional Medicine, Shanghai, China.,Ultrasound Research and Education Institute, Clinical Research Center for Interventional Medicine, School of Medicine, Tongji University, Shanghai, China
| | - L F Wang
- Department of Medical Ultrasound, Shanghai Skin Disease Hospital, Ultrasound Research and Education Institute, School of Medicine, Tongji University, Shanghai, China.,Center of Minimally Invasive Treatment for Tumor, Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Shanghai, China.,Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment, National Clinical Research Center for Interventional Medicine, Shanghai, China.,Ultrasound Research and Education Institute, Clinical Research Center for Interventional Medicine, School of Medicine, Tongji University, Shanghai, China
| | - Y Q Liu
- Department of Pathology, Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai, China
| | - L P Sun
- Department of Medical Ultrasound, Shanghai Skin Disease Hospital, Ultrasound Research and Education Institute, School of Medicine, Tongji University, Shanghai, China.,Center of Minimally Invasive Treatment for Tumor, Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Shanghai, China.,Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment, National Clinical Research Center for Interventional Medicine, Shanghai, China.,Ultrasound Research and Education Institute, Clinical Research Center for Interventional Medicine, School of Medicine, Tongji University, Shanghai, China
| | - L H Guo
- Department of Medical Ultrasound, Shanghai Skin Disease Hospital, Ultrasound Research and Education Institute, School of Medicine, Tongji University, Shanghai, China.,Center of Minimally Invasive Treatment for Tumor, Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Shanghai, China.,Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment, National Clinical Research Center for Interventional Medicine, Shanghai, China.,Ultrasound Research and Education Institute, Clinical Research Center for Interventional Medicine, School of Medicine, Tongji University, Shanghai, China
| | - H X Xu
- Department of Medical Ultrasound, Shanghai Skin Disease Hospital, Ultrasound Research and Education Institute, School of Medicine, Tongji University, Shanghai, China.,Center of Minimally Invasive Treatment for Tumor, Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Shanghai, China.,Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment, National Clinical Research Center for Interventional Medicine, Shanghai, China.,Ultrasound Research and Education Institute, Clinical Research Center for Interventional Medicine, School of Medicine, Tongji University, Shanghai, China
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Wu NH, Ye Y, Wan BB, Yu YD, Liu C, Chen QJ. Emerging Benefits: Pathophysiological Functions and Target Drugs of the Sigma-1 Receptor in Neurodegenerative Diseases. Mol Neurobiol 2021; 58:5649-5666. [PMID: 34383254 DOI: 10.1007/s12035-021-02524-5] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 08/05/2021] [Indexed: 02/06/2023]
Abstract
The sigma-1 receptor (Sig-1R) is encoded by the SIGMAR1 gene and is a nonopioid transmembrane receptor located in the mitochondrial-associated endoplasmic reticulum membrane (MAM). It helps to locate endoplasmic reticulum calcium channels, regulates calcium homeostasis, and acts as a molecular chaperone to control cell fate and participate in signal transduction. It plays an important role in protecting neurons through a variety of signaling pathways and participates in the regulation of cognition and motor behavior closely related to neurodegenerative diseases. Based on its neuroprotective effects, Sig-1R has now become a breakthrough target for alleviating Alzheimer's disease and other neurodegenerative diseases. This article reviews the most cutting-edge research on the function of Sig-1R under normal or pathologic conditions and target drugs of the sigma-1 receptor in neurodegenerative diseases.
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Affiliation(s)
- Ning-Hua Wu
- Hubei Key Laboratory of Diabetes and Angiopathy, Hubei University of Science and Technology, Xianning, 437000, Hubei, China
- Basic Medical College, Hubei University of Science and Technology, Xianning, 437000, Hubei, China
| | - Yu Ye
- Hubei Key Laboratory of Diabetes and Angiopathy, Hubei University of Science and Technology, Xianning, 437000, Hubei, China
| | - Bin-Bin Wan
- Hubei Key Laboratory of Diabetes and Angiopathy, Hubei University of Science and Technology, Xianning, 437000, Hubei, China
| | - Yuan-Dong Yu
- Department of Oncology, Renmin Hospital, Hubei University of Medicine, Shiyan, 442000, Hubei, China
| | - Chao Liu
- Hubei Key Laboratory of Diabetes and Angiopathy, Hubei University of Science and Technology, Xianning, 437000, Hubei, China.
| | - Qing-Jie Chen
- Hubei Key Laboratory of Diabetes and Angiopathy, Hubei University of Science and Technology, Xianning, 437000, Hubei, China.
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Wang S, He B, Hang W, Wu N, Xia L, Wang X, Zhang Q, Zhou X, Feng Z, Chen Q, Chen J. Berberine Alleviates Tau Hyperphosphorylation and Axonopathy-Associated with Diabetic Encephalopathy via Restoring PI3K/Akt/GSK3β Pathway. J Alzheimers Dis 2019; 65:1385-1400. [PMID: 30175975 DOI: 10.3233/jad-180497] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [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: 02/06/2023]
Abstract
BACKGROUND Axonopathy is closely linked to the development of diabetic encephalopathy induced by type II diabetes (T2D). Berberine has been shown to cross the blood-brain barrier and holds promising effect for neuronal damage in diabetes. OBJECTIVE The present study investigated the protective effect and the underlying mechanism of berberine on neuronal axonopathy in both in vitro and in vivo models. METHODS High glucose/high fat diet and streptozotocin injection-induced T2D rat model was used. Berberine was administered p.o. to T2D rat model for 10 weeks. Morris water maze test, in vivo neuronal tracing, immunohistochemistry, and western blot analysis were performed to evaluate the protective effects of berberine in T2D-induced diabetic encephalopathy rats. Primary cultured neurons were used to further explore the underlying mechanisms in vitro. RESULTS Berberine dramatically reduced blood glucose and serum insulin levels and alleviated insulin resistance. Berberine significantly attenuated memory impairment, axonopathy, and tau hyperphosphorylation, and also restored PI3K/Akt/GSK3β signaling pathway in T2D rats. In vitro, berberine induced an increase in the phosphorylation of PI3K/Akt as well as GSK3β in high glucose-treated primary neurons. Furthermore, berberine-induced PI3K/Akt activation also resulted in the dephosphorylation of tau protein, which could improve axonal transport impairment in high glucose-treated primary neurons. Pretreated neurons with LY294002, an inhibitor of PI3K, partially blocked berberine-inhibited tau phosphorylation and berberine-activated PI3K/Akt signaling pathway. CONCLUSIONS Berberine exerts the protective effect against cognitive deficits by improving tau hyperphosphorylation and the axonal damage through restoring PI3K/Akt/GSK3β signaling pathway.
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Affiliation(s)
- Shanshan Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Benhong He
- Department of Cardiovascular Medicine, Lichuan People's Hospital, Lichuan, Hubei, China
| | - Weijian Hang
- Department of Biochemistry and Molecular Biology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - NingHua Wu
- Hubei Key Laboratory of Cardiovascular, Cerebrovascular, and Metabolic Disorders, Hubei University of Science and Technology, Xianning, Hubei, China
| | - Liangtao Xia
- Department of Biochemistry and Molecular Biology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xu Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Qianying Zhang
- Department of Biochemistry and Molecular Biology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xinwen Zhou
- Institute for Brain Research, Huazhong University of Science and Technology, Wuhan, Hubei, China.,Key Laboratory of Neurological Disease of National Education Ministry, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Zuohua Feng
- Department of Biochemistry and Molecular Biology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Qingjie Chen
- Department of Biochemistry and Molecular Biology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China.,New products of TCM Senile Diseases Co-Innovation Center of Hubei, Basic Medical Sciences College, Hubei University of Chinese Medicine, Wuhan, Hubei, China
| | - Juan Chen
- Department of Biochemistry and Molecular Biology, School of Basic Medicine and the Collaborative Innovation Center for Brain Science, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China.,Institute for Brain Research, Huazhong University of Science and Technology, Wuhan, Hubei, China.,Key Laboratory of Neurological Disease of National Education Ministry, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
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Tang XF, Jing YF, Lu W, Huang YZ, Wu NH, Luan Z. [A clinical study of haploidentical hematopoietic stem cell transplantation in the treatment of pediatric patients with acquired severe aplastic anemia: single center experience]. Zhonghua Xue Ye Xue Za Zhi 2019; 40:301-305. [PMID: 31104441 PMCID: PMC7343012 DOI: 10.3760/cma.j.issn.0253-2727.2019.04.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
目的 探讨单倍型造血干细胞移植(haplo-HSCT)治疗儿童获得性重型再生障碍性贫血(SAA)的疗效。 方法 回顾性分析2011年12月1日至2017年12月1日接受haplo-HSCT的59例SAA患者。 结果 ①全部59例SAA患儿中男37例、女22例,中位年龄4.5(1.2~14.8)岁,中位体重43(12~80)kg;SAA-Ⅰ型47例,SAA-Ⅱ型12例,26例为极重型再生障碍性贫血(VSAA);首次移植56例,二次移植3例。②预处理选用白消安+环磷酰胺+抗胸腺细胞球蛋白(ATG)方案或白消安+氟达拉滨+环磷酰胺+ATG方案;采用环孢素A(CsA)+霉酚酸酯+甲氨蝶呤方案预防急性GVHD;回输单个核细胞中位数为15.60(7.74~21.04)×108/kg,CD34+细胞中位数为4.86(3.74~7.14)×106/kg。③全部59例患儿均获得中性粒细胞和血小板植入。中性粒细胞植入中位时间为13(10~19)d,血小板植入中位时间为19(9~62)d。④Ⅰ~Ⅱ、Ⅲ/Ⅳ度急性GVHD发生率分别为45.76%(27/59)、13.56%(8/59),慢性GVHD发生率为8.47%(5/59)。巨细胞病毒血症发生率为59.32%(35/59)、EB病毒血症发生率为28.81%(17/59)。⑤中位随访时间30(8~80)个月,57例无病存活,2例死亡(均死于GVHD),5年总生存率、无失败生存率均为(96.4±2.5)%。 结论 haplo-HSCT是儿童SAA疗效较好的治疗方法。
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Affiliation(s)
- X F Tang
- Department of Paediatrics, Sixth Medical Center of PLA General Hospital of the People Liberation Army. Beijing 100048, China
| | - Y F Jing
- Department of Paediatrics, Sixth Medical Center of PLA General Hospital of the People Liberation Army. Beijing 100048, China
| | - W Lu
- Department of Paediatrics, Sixth Medical Center of PLA General Hospital of the People Liberation Army. Beijing 100048, China
| | - Y Z Huang
- Hematology Department Laboratory, Sixth Medical Center of PLA General Hospital of the People Liberation Army, Beijing 100048, China
| | - N H Wu
- Department of Paediatrics, Sixth Medical Center of PLA General Hospital of the People Liberation Army. Beijing 100048, China
| | - Z Luan
- Department of Paediatrics, Sixth Medical Center of PLA General Hospital of the People Liberation Army. Beijing 100048, China
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Gao X, Pan WS, Dai H, Zhang Y, Wu NH, Shen YF. CARM1 activates myogenin gene via PCAF in the early differentiation of TPA-induced rhabdomyosarcoma-derived cells. J Cell Biochem 2010; 110:162-70. [PMID: 20213728 DOI: 10.1002/jcb.22522] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
CARM1/PRMT4 is a member of the protein arginine methyltransferase (PRMT) family. CARM1 as a transcriptional coactivator plays an active role on mammalian genes. Here, we show that CARM1 can be recruited to the promoter of myogenin gene to enhance its transcriptional activation via PCAF at the early stage of TPA-induced RD cell differentiation. By adding adenosine dialdehyde, AdOx, to inhibit the PRMT in RD cells, the TPA-induced recruiting of p300, PCAF and the Brg1 at the myogenin promoter is abolished and myogenic differentiation is blocked. More specifically, the expression of PCAF and its nucleation are prohibited when CARM1 is knockdown by its specific siRNA. We suggest that the physical interaction of CARM1 and PCAF is likely pivotal for the activation of PCAF in the downstream of CARM1 pathway for inducing myogenin under TPA-induced differentiation. The findings shed lights on novel therapeutic targets in the treatment of rhabdomyosarcoma patients.
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Affiliation(s)
- Xin Gao
- National Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
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Shen JH, Zhang Y, Wu NH, Shen YF. Resistance to geldanamycin-induced apoptosis in differentiated neuroblastoma SH-SY5Y cells. Neurosci Lett 2007; 414:110-4. [PMID: 17293044 DOI: 10.1016/j.neulet.2006.06.050] [Citation(s) in RCA: 9] [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] [Received: 05/08/2006] [Revised: 06/15/2006] [Accepted: 06/16/2006] [Indexed: 10/23/2022]
Abstract
Geldanamycin (GA) is a specific inhibitor of the 90 kDs heat shock protein (Hsp90) in the cytoplasm of mammalian cells, which binds directly to Hsp90 and promotes proteolytic degradation of its client proteins. As an antitumor drug, GA antagonizes the protecting effects of Hsp90 on cell survival, while its mechanisms remain unclear. Here, we show that GA induces apoptosis in a human neuroblastoma cell line, SH-SY5Y. Treatment of the cells with all trans retinoic acid (RA) generates a neuron-like, morphological change of differentiation, and results in the activation of ERK and Akt pathways, an inhibition of the nuclear translocation of p53 induced by GA, and induces higher resistance to the GA-induced apoptosis. These results provide the first evidence for the requirement of p53 nucleation in SH-SY5Y cells to counteract GA in neuron survival.
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MESH Headings
- Active Transport, Cell Nucleus/drug effects
- Active Transport, Cell Nucleus/physiology
- Antibiotics, Antineoplastic/pharmacology
- Apoptosis/drug effects
- Apoptosis/physiology
- Benzoquinones/pharmacology
- Brain Neoplasms/drug therapy
- Brain Neoplasms/metabolism
- Brain Neoplasms/physiopathology
- Cell Differentiation/drug effects
- Cell Differentiation/physiology
- Cell Line, Tumor
- Cell Survival/drug effects
- Drug Resistance, Neoplasm/drug effects
- Drug Resistance, Neoplasm/physiology
- Extracellular Signal-Regulated MAP Kinases/drug effects
- Extracellular Signal-Regulated MAP Kinases/metabolism
- Ganglia, Sympathetic/drug effects
- Ganglia, Sympathetic/metabolism
- Ganglia, Sympathetic/physiopathology
- Humans
- Lactams, Macrocyclic/pharmacology
- Neuroblastoma/drug therapy
- Neuroblastoma/metabolism
- Neuroblastoma/physiopathology
- Neurons/drug effects
- Neurons/metabolism
- Proto-Oncogene Proteins c-akt/drug effects
- Proto-Oncogene Proteins c-akt/metabolism
- Tretinoin/pharmacology
- Tumor Suppressor Protein p53/drug effects
- Tumor Suppressor Protein p53/metabolism
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Affiliation(s)
- Jin-Hua Shen
- National Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, 5 Dongdan Santiao, Beijing 100005, China
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Lu Y, Sheng DQ, Mo ZC, Li HF, Wu NH, Shen YF. A negative regulatory element-dependent inhibitory role of ITF2B on IL-2 receptor alpha gene. Biochem Biophys Res Commun 2005; 336:142-9. [PMID: 16126178 DOI: 10.1016/j.bbrc.2005.08.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [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: 08/03/2005] [Accepted: 08/05/2005] [Indexed: 11/23/2022]
Abstract
Despite the fact that the negative regulatory element (NRE) within the upstream regulatory region of human IL-2 receptor alpha (IL-2Ralpha) gene has been identified two decades ago, mechanisms of the NRE function on the gene are hitherto unknown. In this paper, we report for the first time that the immunoglobulin transcription factor 2B (ITF2B) encoded by transcription factor 4 (TCF4) gene is a NRE binding protein. The full-length TCF4 cDNA clone was obtained from a HTLV-1 transformed human peripheral T cell MACHERMAKER cDNA library with NRE as the bait in yeast one-hybrid system. The NRE binding ability of ITF2B was further confirmed in chromatin-immunoprecipitation assay. Competitive RT-PCR-based promoter activity assay showed that over-expression of ITF2B protein inhibited the expression of IL-2Ralpha gene in Jurkat cells in an NRE-dependent manner. The function of ITF2B on the inhibition of both the IL-2Ralpha and the 5'LTR activity of HIV-1 shed light on the essence of NRE binding protein as a potential target for immune therapy and treatment in AIDS patients.
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Affiliation(s)
- Yu Lu
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100005, China
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Zhang Y, Wang JS, Chen LL, Zhang Y, Cheng XK, Heng FY, Wu NH, Shen YF. Repression of hsp90β Gene by p53 in UV Irradiation-induced Apoptosis of Jurkat Cells. J Biol Chem 2004; 279:42545-51. [PMID: 15284248 DOI: 10.1074/jbc.m314213200] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [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: 11/06/2022] Open
Abstract
Tumor suppressor p53 has been implicated in cell stress response and determines cell fate of either growth arrest or apoptosis. Heat shock proteins (Hsps) expressed under stress usually confer survival protection to the cell or interruption in the apoptotic pathways. Although Hsp90 can physically interact with p53, whether or not the hsp90 gene is influenced downstream of p53 in UV irradiation-induced apoptosis remains unclear. We have found that the level of p53 is elevated with the decline of Hsp90 in UV-irradiated cells and that malfunction of Hsp90, as inhibited by geldanamycin, enhances the p53-involved UV irradiation-induced apoptosis. In addition, the expression of the hsp90beta gene was reduced in both UV-irradiated and wild type p53-transfected cells. These results suggest a negative correlation between the trans factor p53 and a chaperone gene hsp90beta in apoptotic cells. Mutation analysis demonstrated that the p53 binding site in the first exon was indispensable for p53 regulation on the hsp90beta gene. In addition, with p53 bound at the promoter of the hsp90beta gene, mSin3a and p300 were differentially recruited in UV irradiation-treated or untreated Jurkat cells in vivo. The evidence of p53-repressed hsp90beta gene expression in UV-irradiated cells shed light on a novel pathway of Hsp90 in the survival control of the stressed cells.
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Affiliation(s)
- Ye Zhang
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100005, China
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10
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Abstract
An early event in cellular heat shock response is the transmittance of stress signals from the cell surface into the nuclei, resulting in the induction of heat shock proteins (Hsps). Protein kinase C (PKC) has been implicated as a key player in transducing stress signals. However, mechanism(s) by which PKC regulates heat shock-induced events remains largely unknown. Here we present data that pan-PKC inhibitor GF109203X, but not classic PKC inhibitor Gö6976, specifically repressed heat shock-induced accumulation of mRNA as well as promoter activity of hsp90 beta, but not hsp90 alpha, in Jurkat cells. Subcellular fractionation studies revealed that heat shock exclusively induced PKC-epsilon membrane translocation. Consistently, expression of a constitutively active PKC-epsilon(A159E) resulted in an enhanced promoter activity of hsp90 beta upon heat shock, whereas a dominant-negative PKC-epsilon(K437R) abolished this effect. In contrast, constitutively active-PKC-alpha or dominant-negative-PKC-alpha had no effects on heat shock induction of the gene. The effect of PKC-epsilon on hsp90 beta expression seems to be stimuli-specific, as phorbol myristate acetate-mediated hsp90 beta expression was PKC-epsilon-independent. We conclude that PKC-epsilon is specifically required in the signaling pathway leading to the induction of hsp90 beta gene in response to heat shock.
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Affiliation(s)
- Jian-Min Wu
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100005, China
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11
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Chen XS, Wu NH, Shen YF. [Role of STAT1 on the regulation the human hsp90 alpha gene expression]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2001; 23:356-60. [PMID: 12940076] [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: 03/04/2023]
Abstract
OBJECTIVE To investigate the role of STAT1 on the regulation of human hsp90 alpha gene expression. METHODS We first transfected Jurkat cells with the STAT1 expression construct and analyzed the expression of hsp90 alpha gene expression via quantitative RT-PCR system. Then we co-transfected the STAT1 expression construct and the CAT reporter gene driven by different length of 5' flanking sequence of hsp90 alpha gene. Western blot was carried out to detect the level of tyrosine phosphorylation in Jurkat cells with and without heat shock treatment (42 degrees C 1 h). By electrophoretic mobility shift assays (EMSA), we evaluated the DNA binding activity of a STAT1 responsible element located in the regulatory region of hsp90 alpha gene in Jurkat cell nuclear extracts. RESULTS The mRNA level of hsp90 alpha gene in Jurkat cells was decreased when transfected by STAT1 expression construct, over-expression of STAT1 down-regulates the expression of CAT reporter gene with the present of a distal fragment from -1756 to -1463 within the 5' flanking regulatory sequences of hsp90 alpha gene. The tyrosine phosphorylation of STAT1 was detectable in Jurkat cells and increased when subjected to heat shock. Electrophoretic mobility shift assays (EMSA) results showed that STAT1 could bind to its responsible element in the regulatory region of hsp90 alpha gene. CONCLUSION STAT1 could negatively regulate the human hsp90 alpha gene expression.
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Affiliation(s)
- X S Chen
- National Laboratory of Medical Molecular Biology, CAMS and PUMC, Beijing 100005, China
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12
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Wang TY, Wu NH, Shen YF. [Gene expression changes after heat shock by cDNA array analysis]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2001; 23:361-4. [PMID: 12940077] [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: 03/04/2023]
Abstract
OBJECTIVE To study gene expression changes of cells in response to heat stress, we isolated total RNA from Jurkat cells before and after heat shock treatment. METHODS cDNA was labeled with alpha-32P-dATP during reverse transcription of RNA and then used as probe to cDNA expression array. Autoradiogram images were analyzed by ESTblot software. RESULTS After heat shock, the expression level of some forty genes increased while that of sixteen genes decreased. In addition to the elevated expression of heat shock genes, expression of c-Jun and CLK-1 increased most remarkably. The genes with notably decreased expression were integrin alpha-4 and transforming growth factor beta. The elevated expression of c-Jun and hsp90 alpha was further confirmed by Northern blot analysis. CONCLUSIONS The expression of some genes in Jurkat cells changes after heat shock treatment. Heat shock induces elevated expression of hsp, c-Jun, CLK-1 gene while decreases expression of integrin alpha-4 and transforming growth factor beta.
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Affiliation(s)
- T Y Wang
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, CAMS and PUMC, Beijing 100005, China
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13
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Abstract
BACKGROUND/AIMS Possible pathogenic differences among hepatitis B virus (HBV) genotypes have been observed; however, the response to interferon therapy among HBV genotypes remains unknown. We therefore analyzed the efficacy of interferon alfa in the treatment of chronic hepatitis B patients with different HBV genotypes. METHODS Fifty-eight genotype B or C infected chronic hepatitis B patients who had been treated with interferon alfa-2b were retrospectively studied. The response to interferon was defined as normalization of serum aminotransferase level, loss of hepatitis B e antigen and HBV DNA 48 weeks post-treatment. RESULTS Baseline data of both groups of patients were comparable; however, genotype C patients had a higher serum aminotransferase level and a higher frequency of core promoter mutation. The response rate was 41% and 15% in genotype B and C patients, respectively (p=0.045). In those with higher serum aminotransferase levels, the response rate was 50% and 17%, respectively (p=0.025). Additionally, younger age and genotype B infection may predict a better response to interferon alfa. CONCLUSIONS HBV genotype C, compared to genotype B, is associated with a higher frequency of core promoter mutation, and a lower response rate to interferon alfa therapy.
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Affiliation(s)
- J H Kao
- Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei
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Affiliation(s)
- N H Wu
- Departments of Internal Medicine and Emergency Medicine, College of Medicine, National Taiwan University, Department of Internal Medicine, En Chu Kong Hospital, Taipei, Taiwan
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Wu NH, Wang CC, Huang GT, Yang PM, Sheu JC, Chen DS. A different experience of hepatic adenoma in Taiwan with emphasis on clinical manifestations and ultrasonographic features. Hepatogastroenterology 1999; 46:3197-200. [PMID: 10626185] [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: 02/15/2023]
Abstract
BACKGROUND/AIMS Hepatic adenoma is a rare benign hepatic tumor and it is difficult to differentiate it from other focal hepatic tumors. Ultrasonography has become the choice of methods to detect focal hepatic lesions. The study aims at analyzing ultrasonographic features of hepatic adenoma. METHODOLOGY A total of 8 patients with pathologically proven hepatic adenoma were studied retrospectively during an 8-year period. The ultrasound scanners used were Toshiba SSA-100A, Toshiba SSA-240 and Aloka 630. The ultrasonographic features and clinical data were analyzed. RESULTS There were 7 males and 1 female. The mean age was 50 years. Of the 8 cases, 2 symptomatic cases had a tumor larger than 10 cm. The remaining 6 cases were asymptomatic and had tumors smaller than 5 cm. The echogenicity was variable in these tumors. An irregular sonolucent was only noted in a 15 cm tumor and was histologically proven to be internal bleeding. All the tumors were well-defined, however, a hypoechoic rim was obvious only in the isoechoic and hyperechoic tumors. CONCLUSIONS Ultrasonographic features of some hepatic adenomas are different from those of hepatocellular carcinomas and hemangiomas, although the differential diagnosis cannot be made in small hypoechoic tumors. When ultrasonography is used more widely, more asymptomatic patients with small-sized hepatic adenoma will be detected, even in male subjects. The concept about the pathogenesis of hepatic adenomas may be changed.
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Affiliation(s)
- N H Wu
- Department of Internal Medicine, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan
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Abstract
Mammalian HSP90alpha and HSP90beta are encoded by two individual genes. On the basis of the upstream sequences of the human hsp90alpha gene, GenBank accession number U25822, we have constructed CAT reporter plasmids driven by individual fragments of the hsp90alpha gene. We found that (1) the proximal heat shock element complex located at -96/-60 enhances hsp90alpha promoter expression; (2) heat shock induction depends upon the coexistence of distal heat shock element at -1031/-1022 and the proximal heat shock element complex of the hsp90alpha gene; (3) unlike hsp90beta, downstream sequences of the transcription start site inhibit hsp90alpha expression. We conclude that the regulatory mechanisms for the expression of hsp90alpha and hsp90beta genes are different.
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Affiliation(s)
- S L Zhang
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing
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17
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Abstract
Random Amplified Polymorphic DNA (RAPD) analysis is a new technology of molecular marking which has proved very powerful in detecting genetic diversity at the level of population. The genomic DNAs used in our experiment were extracted from fresh leaves taken from 59 individuals sampled from three natural populations in Yan An, Shanxi Province. Through more than 2,000 PCRs, deep-going RAPD analysis was carried out on DNA samples from 49 individuals. The percentage of polymorphic RAPD loci found in these three populations were respectively 27.2%, 18.6% and 5.4%; the average genetic distances within population, 0.055, 0.036 and 0.008; the average genetic distances between populations (I-II), (I-III) and (II-III), 0.105, 0.096 and 0.060. The genetic diversity of A. brachypus within and between populations was found, for the first time, to be rather poor, thus revealing innate factors as the cause contributing to its endangered status. In addition, our work also provides basic materials for elucidating the underlying cause of its endangerment and for its protection biology.
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Affiliation(s)
- H J Yan
- Institute of Developmental Biology, Chinese Academy of Sciences, Beijing
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18
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Abstract
Factors associated with orthostatic hypotension are heterogeneous, and some of the factors are interrelated and interdependent, which may confound their relationships to orthostatic hypotension. To investigate the factors that were most likely related to orthostatic hypotension, a study of community-dwelling persons (419 men and 309 women) was conducted. Blood pressures and heart rates were measured after the subjects had been recumbent for 5 min and upright for 1 min. A total of 119 persons (16.3%) experienced orthostatic hypotension. Univariate analysis showed that orthostatic hypotension was associated with the following variables: hypertension, diabetes mellitus, cerebrovascular disease, proteinuria, abnormal renal function, or medications use. Those patients with orthostatic hypotension were older in age and had a higher body mass index, seated blood pressure, plasma creatinine, hemoglobin A1c, fasting and 2-h postload glucose levels than those without orthostatic hypotension. Multivariate analysis revealed that diabetes mellitus, hypertension, and age were independently associated factors for orthostatic hypotension. The higher the level of plasma hemoglobin A1c (%) elevation, the higher the likelihood of orthostatic hypotension manifestation. Clinically, elderly persons or patients with hypertension or diabetes mellitus should receive regular monitoring of supine and upright blood pressure in order to detect orthostatic hypotension and prevent its complications.
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Affiliation(s)
- J S Wu
- Department of Family Medicine, National Cheng Kung University Hospital, Tainan, Republic of China, Taiwan
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Mi ZY, Liu LX, Wang GF, Wu NH. [A novel conservative structure found in the carp mitochondrial tRNA(phe) gene]. Shi Yan Sheng Wu Xue Bao 1996; 29:269-72. [PMID: 9639812] [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: 02/07/2023]
Abstract
A nucleotide sequence for the tRNA(phe) gene of Carp mitochondria was determined. Sequence data comparisons made among the whale, human, Xenopus laevis, bovine, mouse, chicken and carp, showed that a novel conservative structure was found in the D. stem (dihydrouridine stem), which was known had variant nucleotides in any other vertebrate mitochondrial tRNA and cytoplasmic tRNA genes. This conservative structures contains 13 bp. When we compared the front 7 bp of the conservative structure with the eukaryotic RNA Pol III recognitive A domain, we found these two kinds of different species had partly homologue. As the mitochondrial tRNA(phe) gene is located between the displacement loop and mitochondrial rRNA gene, we inferred that the novel conservative structure might have some extra interesting functions.
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Affiliation(s)
- Z Y Mi
- Institute of Developmental Biology, Academia Sinica, Beijing
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20
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Abstract
Using IgH and TCR gamma gene rearrangements as gene markers, we detected minimal residual disease (MRD) by means of the polymerase chain reaction (PCR) and restriction analysis. Of 18 children with acute lymphoblastic leukemia (ALL), MRDs were detected in 9 patients after termination of therapy. All 18 patients had been followed for 1.5 to 102 months after detection. Three of the nine MRD-positive patients relapsed within 3 to 6 months; none of the nine MRD-negative patients relapsed. We suggest that MRD negativity at the end of therapy might be an important factor for long-term disease-free survival, because the negative cases had a very low risk of relapse. Because the outcome for MRD-positive cases is more difficult to evaluate, patients with MRD after termination of therapy should be monitored.
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Affiliation(s)
- N H Wu
- Department of Pediatrics, Yanjing Hospital, Beijing, China
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21
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Zhou LW, Feng Y, Wang GF, Wu NH. [Structure analysis of the mitochondrial tRNA(Cys) gene and the original region of light-strand replication from carp]. Shi Yan Sheng Wu Xue Bao 1993; 26:463-8. [PMID: 8023638] [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: 01/28/2023]
Abstract
In this study, we have determined the nucleotide sequences of the cysteine tRNA gene and the original region of light-strand replication from carp (Cyprinus carpio L.) mitochondrion, which were further represented respectively in cloverleaf secondary structure and stem loop structure. By comparing the nucleotide sequences of 5 vertebrate tRNA(Cys) genes, it is found that carp mitochondrial tRNA(Cys) gene have many unusual structural features differing from those of cytoplasmic tRNA(Cys) gene. The carp mitochondrial original region of light-strand replication consists of 36 bases which include 11 base pairs in its stem and 14 bases in its loop. By making a comparison between the nucleotide sequences of the carp original region of light-strand replication and those of other 10 vertebrates, it is further found that stem sequence of carp is very conservative while loop sequence is very variable. This result indicates that stem structure may play an important role in the replication of light strand.
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Affiliation(s)
- L W Zhou
- Institute of Developmental Biology, Academia Sinica, Beijing
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22
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Wang GF, Wu NH. Structure of the mitochondrial URFA6L gene and tRNA(Lys) gene from CARP. Sci China B 1992; 35:155-61. [PMID: 1580999] [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: 12/27/2022]
Abstract
The carp mitochondrial URFA6L gene consists of 165 base pairs. The overall structural organization of the gene is very similar to that of the Xenopus URFA6L gene. Their nucleotide sequences exhibit 68% homology. The carp URFA6L gene encodes a protein of 54 amino acids. The amino acid composition of the protein is unusual because almost half of the residues consist of 5 hydrophobic amino acids (proline, tryptophan, leucine, isoleucine and tyrosine). A comparison between the amino acid sequences of 5 vertebrate URFA6L proteins and the yeast ATPase 8 showed that they have weak but very important common structural features, suggesting that the vertebrate URFA6L proteins may function as ATPase8. The nucleotide sequence of the lysine tRNA gene from carp has been determined and represented in clover-leaf secondary structure. Similar to amphibian and mammalian mitochondrial tRNA(Lys) genes, the carp mitochondrial tRNA(Lys) gene also has some unusual structural features as compared with its cytoplasmic counterpart. A comparison between the nucleotide sequences of the tRNA(Lys) gene from 7 vertebrates showed that the most conservative portions are the anticodon loop, nucleotides 8 and 9, the variable loop, the anticodon stem and the aminoacyl stem. The least conservative portions are the D-loop and the T-loop. These structural features may show that the mitochondrial tRNA(Lys) has a different interaction with mitochondrial ribosome.
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Affiliation(s)
- G F Wang
- Institute of Developmental Biology, Academia Sinica, Beijing, PRC
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23
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Liu ZJ, Wu NH, Shen YF. A method for simultaneous detection of the transcripts of different cellular genes. J Biochem Biophys Methods 1989; 19:349-52. [PMID: 2482308 DOI: 10.1016/0165-022x(89)90066-3] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In this paper, a method for preparing radioactive-labelled first-strand cDNA has been described and the major procedures and reaction conditions have been studied. Some advantages provided by this method for simultaneously detecting the expression of multiple cellular genes are discussed.
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Affiliation(s)
- Z J Liu
- Department of Molecular Biology and Biochemistry, Chinese Academy of Medical Sciences, Beijing
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Côté JC, Wu NH, Wu R. Nucleotide sequence of the rice chloroplast apocytochrome b6 gene (petB). Plant Mol Biol 1988; 11:873-874. [PMID: 24272638 DOI: 10.1007/bf00019528] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/1988] [Accepted: 09/19/1988] [Indexed: 06/02/2023]
Affiliation(s)
- J C Côté
- Section of Biochemistry, Molecular and Cell Biology, Cornell University, 14853, Ithaca, NY, USA
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Delaney R, Wong RN, Meng GZ, Wu NH, Tang J. Amino acid sequence of rhizopuspepsin isozyme pI 5. J Biol Chem 1987; 262:1461-7. [PMID: 3027093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The complete amino acid sequence of an aspartic protease from Rhizopus chinensis, rhizopuspepsin isozyme pI 5, has been determined. Partial sequences were first obtained from the isolated isozyme by a combination of chemical and proteolytic enzyme cleavages, peptide purifications, and Edman degradations. About one-half of the sequence was revealed by this approach. To complete the amino acid sequence, a cDNA library of R. chinensis in pBR322 was constructed. An oligonucleotide probe was synthesized based on the sequence Trp-Trp-Gly-Ile-Thr, and about 40 positive clones were identified by colony hybridization. A clone, 33E2, which had an insert size of about 1.1 kilobase pairs, was found to contain the entire coding region of rhizopuspepsin isozyme pI 5. The sequence of rhizopuspepsin contains 325 amino acid residues. The alignment of the rhizopuspepsin sequence against other aspartic proteases revealed expected homology, with the closest similarity to penicillopepsin which shares 39% identical residues. Porcine pepsin shares about 36% identical residues with rhizopuspepsin.
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Wu DL, Zhang LM, Sun J, Chen Q, Wu NH, Gao ZF, Mao QW. [Absorption and distribution of 125I-modified snake neurotoxin in rats]. Zhongguo Yao Li Xue Bao 1986; 7:300-2. [PMID: 2954386] [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: 01/03/2023]
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Shen YF, Cheng XK, Wu NH, Zhang YR, Liu Y, Wang SZ. [Studies on Lymphokines. II. A preliminary study on alkaline lymphokines (author's transl)]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 1980; 2:213-9. [PMID: 6458370] [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: 01/20/2023]
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