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Tong YH, Bai Y, Feng JM, Ya JD. Agapetesheana, a new species of A.ser.Longifiles (Ericaceae) from Yunnan, China. PhytoKeys 2021; 180:133-139. [PMID: 34408536 PMCID: PMC8367934 DOI: 10.3897/phytokeys.180.69667] [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] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 07/15/2021] [Indexed: 06/13/2023]
Abstract
Agapetesheana Y. H. Tong & J. D. Ya (Ericaceae), a new species from Lüchun Xian, Yunnan Province, China is described and illustrated. This new species is assigned to Agapetessect.Agapetesser.Longifiles Airy Shaw. It is closest to A.inopinata Airy Shaw and A.oblonga Craib, but differs in having bead-like tubers, leaf blade with a wholly serrulate margin, subulate and much longer calyx lobes, much larger corollas that are carmine, green at the apex and maroon on angles, and longer stamens without spurs on the back.
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Affiliation(s)
- Yi-Hua Tong
- Key Laboratory of Plant Resources Conservation and Sustainable Utilization & Key Laboratory of Digital Botanical Garden of Guangdong Province, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China South China Botanical Garden, Chinese Academy of Sciences Guangzhou China
- Center of Conservation Biology, Core Botanical Gardens, Chinese Academy of Sciences, Guangzhou, 510650, China Core Botanical Gardens, Chinese Academy of Sciences Guangzhou China
| | - Ying Bai
- Forestry and Grassland Bureau of Honghe Prefecture, Honghe Avenue, Mengzi, Yunnan, 661100, China Forestry and Grassland Bureau of Honghe Prefecture Mengzi China
| | - Jian-Ming Feng
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, Heilongtan, Kunming, Yunnan, 650201, China Kunming Institute of Botany, Chinese Academy of Sciences Kunming China
| | - Ji-Dong Ya
- Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Lanhei Road 132, Heilongtan, Kunming, Yunnan, 650201, China Kunming Institute of Botany, Chinese Academy of Sciences Kunming China
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2
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Zhang JN, Qu HY, Zhang JM, Feng JM, Song WJ, Yuan FH. [Polysaccharide from Phellinus igniarius alleviates oxidative stress and hepatic fibrosis in Schistosoma japonicum-infected mice]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2019; 31:615-621. [PMID: 32064805 DOI: 10.16250/j.32.1374.2018287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE To evaluate the role of polysaccharide from Phellinus igniarius (PPI) in the improvement of oxidative stress, hepatic granuloma and hepatic fibrosis in Schistosoma japonicum-iniected in mice. METHODS The mouse model of schistosomiasis was established by S. japonicum cercariae infection via the abdomen. Balb/c mice were randomly assigned into 5 groups, including the healthy control group (Group A), infection control group (Group B), PPI treatment group (Group C), praziquantel treatment group (Group D) and PPI-praziquantel combination group (Group E), of 10 mice in each group. Each mouse in groups B, C, D and E was infected with (30 ± 2) S. japonicum cercariae. Then, mice in groups D and E were given praziquantel by gavage at a dose of 500 mg/kg for successive two days on day 42 post-infection, while mice in groups C and E were given PPI by gavage at a dose of 400 mg/kg for successive 30 days on day 42 post-infection. Histopathological changes of hepatic tissues were observed using hematoxylin-eosin (HE) staining, and serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), hyaluronic acid (HA), laminin (LN) were determined, while the activities of malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), glutathione reductase (GSH-R) and glutathione (GSH) were detected in Mouse liver homogenates. The expression of transforming growth factor-beta (TGF-β) and alpha-smooth muscle actin (α-SMA) was quantified in hepatic tissues using immunohistochemistry, and the Nrf2 and Gsta4 gene expression was quantified using quantitative real-time PCR (qPCR) assay. RESULTS Untreated mice presented typical pathological changes of schistosomal hepatic disorders, while PPI treatment effectively alleviated hepatic egg granulomas and collagen deposition. S. japonicum infection resulted in aggravation of hepatic lipid peroxidation, induction of oxidative stress, elevated serum MDA level and a reduction in the activity of GSH and antioxidant enzymes activities in mice. As compared to infected but untreated mice, PPI treatment suppressed hepatic lipid peroxidation, increased the GSH activity and restored the activity of antioxidant enzymes. In addition, PPI treatment inhibited the TGF-β signaling pathway and up-regulated the Nrf2 and Gsta4 gene expression. CONCLUSIONS PPI plays a critical role in the treatment of schistosomiasis-induced hepatic fibrosis. It may improve oxidative stress damages through up-regulating Nrf2 and Gsta4 gene expression, thereby suppressing the development of hepatic egg granulomas and hepatic fibrosis.
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Affiliation(s)
- J N Zhang
- School of Medcine, Jianghan University, Wuhan 430056, China
| | - H Y Qu
- School of Medcine, Jianghan University, Wuhan 430056, China
| | - J M Zhang
- School of Medcine, Jianghan University, Wuhan 430056, China
| | - J M Feng
- School of Medcine, Jianghan University, Wuhan 430056, China
| | - W J Song
- School of Medcine, Jianghan University, Wuhan 430056, China
| | - F H Yuan
- School of Medcine, Jianghan University, Wuhan 430056, China
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Liu XG, Bai XC, Chen FP, Cheng YF, Dai KS, Fang MY, Feng JM, Gong YP, Guo T, Guo XH, Han Y, Hong LJ, Hu Y, Hua BL, Huang RB, Li Y, Peng J, Shu MM, Sun J, Sun PY, Sun YQ, Wang CS, Wang SJ, Wang XM, Wu CM, Wu WM, Yan ZY, Yang FE, Yang LH, Yang RC, Yang TH, Ye X, Zhang GS, Zhang L, Zheng CC, Zhou H, Zhou M, Zhou RF, Zhou ZP, Zhu HL, Zhu TN, Hou M. Chinese guidelines for treatment of adult primary immune thrombocytopenia. Int J Hematol 2018; 107:615-623. [PMID: 29619624 DOI: 10.1007/s12185-018-2445-z] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [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: 11/28/2017] [Revised: 03/22/2018] [Accepted: 03/22/2018] [Indexed: 02/05/2023]
Abstract
Primary immune thrombocytopenia (ITP) is a bleeding disorder commonly encountered in clinical practice. The International Working Group (IWG) on ITP has published several landmark papers on terminology, definitions, outcome criteria, bleeding assessment, diagnosis, and management of ITP. The Chinese consensus reports for diagnosis and management of adult ITP have been updated to the 4th edition. Based on current consensus positions and new emerging clinical evidence, the thrombosis and hemostasis group of the Chinese Society of Hematology issued Chinese guidelines for management of adult ITP, which aim to provide evidence-based recommendations for clinical decision making.
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Affiliation(s)
- Xin-Guang Liu
- Department of Hematology, Qilu Hospital, Shandong University, Jinan, 250012, China
| | - Xiao-Chuan Bai
- General Hospital of Ningxia Medical University, Yinchuan, China
| | - Fang-Ping Chen
- Xiangya Hospital, Centre South University, Changsha, China
| | | | - Ke-Sheng Dai
- The First Affiliated Hospital of Soochow University, Suzhou, China
| | - Mei-Yun Fang
- The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | | | - Yu-Ping Gong
- West China Hospital, Sichuan University, Chengdu, China
| | - Tao Guo
- Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xin-Hong Guo
- The First Affiliated Hospital of Xinjiang Medical University, Ürümqi, China
| | - Yue Han
- The First Affiliated Hospital of Soochow University, Suzhou, China
| | | | - Yu Hu
- Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Bao-Lai Hua
- Northern Jiangsu People's Hospital, Yangzhou, China
| | - Rui-Bing Huang
- The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Yan Li
- The First Hospital of Chinese Medical University, Shenyang, China
| | - Jun Peng
- Department of Hematology, Qilu Hospital, Shandong University, Jinan, 250012, China
| | - Mi-Mi Shu
- Xijing Hospital, The Fourth Military Medical University, Xi'an, China
| | - Jing Sun
- Nanfang Hospital, Nanfang Medical University, Guangzhou, China
| | - Pei-Yan Sun
- Xinqiao Hospital, The Third Military Medical University, Chongqing, China
| | - Yu-Qian Sun
- Peking University People's Hospital, Beijing, China
| | - Chun-Sen Wang
- Sichuan Provincial People's Hospital, Chengdu, China
| | - Shu-Jie Wang
- Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiao-Min Wang
- People's Hospital of Xinjiang Uygur Autonomous Region, Ürümqi, China
| | - Cong-Ming Wu
- Hainan Provincial People's Hospital, Haikou, China
| | - Wen-Man Wu
- Ruijin Hospital, Shanghai Jiao Tong University, Shanghai, China
| | - Zhen-Yu Yan
- Affiliated Hospital of North China University of Science and Technology, Tangshan, China
| | - Feng-E Yang
- Union Hospital of Fujian Medical University, Fuzhou, China
| | - Lin-Hua Yang
- The Second Hospital of Shanxi Medical University, Taiyuan, China
| | - Ren-Chi Yang
- Institute of Haematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Tong-Hua Yang
- The First People's Hospital of Yunnan Province, Kunming, China
| | - Xu Ye
- The Second Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Guang-Sen Zhang
- The Second Xiangya Hospital, Central South University, Changsha, China
| | - Lei Zhang
- Institute of Haematology and Blood Diseases Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | | | - Hu Zhou
- Henan Cancer Hospital, Zhengzhou, China
| | - Min Zhou
- Chengdu Women and Children's Hospital, Chengdu, China
| | | | - Ze-Ping Zhou
- The Second Affiliated Hospital of Kunming Medical University, Kunming, China
| | - Hong-Li Zhu
- Chinese PLA General Hospital, Beijing, China
| | - Tie-Nan Zhu
- Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Ming Hou
- Department of Hematology, Qilu Hospital, Shandong University, Jinan, 250012, China.
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Bian Y, Liu MS, Zhang LY, Li GC, Feng JM, Liang X, Zheng YG, Wang J. [Determination of six active ingredients in different parts of Belamcanda chinensis and Iris tectorum and their anti-inflammatory activity]. Zhongguo Zhong Yao Za Zhi 2018; 43:119-122. [PMID: 29552821 DOI: 10.19540/j.cnki.cjcmm.20171027.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 09/07/2017] [Indexed: 06/08/2023]
Abstract
In order to explore the anti-inflammatory activity and active ingredient basis from the leaves of the Belamcanda chinensis and Iris tectorum, we established an HPLC method for simultaneous determination of six anti-inflammatory active ingredient contents in the root of the B. chinensis and I. tectorum as well as their leaves with different dry methods, and the anti-inflammatory effects of the extract were studied by the mouse ear swelling experiment. The HPLC analysis was performed on an Agilent WondaSil© C₁₈-WR(4.6 mm×250 mm,5 μm),with isocratic elution of acetonitrile-0.1% ortho-phosphoric acid solution at a flow rate of 1. 0 mL·min⁻¹ and the detection was carried out at 265 nm. The chemical compositions of the B. chinensis and I. tectorum are similar but the contents of them are obviously different. Both rhizome and leaf extract of B. chinensis and I. tectorum had inhibitory effects on inflamed mice induced by dimethylbenzene and had anti-inflammatory effects by animal experiment, which could lay the material and active foundation for the development of the non-medicinal parts of the B. chinensis and I. tectorum.
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Affiliation(s)
- Ya Bian
- Hebei University of Chinese Medical, Shijiazhuang 050200, China
| | | | - Li-Yuan Zhang
- Hebei University of Chinese Medical, Shijiazhuang 050200, China
| | - Guo-Chuan Li
- Hebei University of Chinese Medical, Shijiazhuang 050200, China
| | - Jian-Ming Feng
- Hebei University of Chinese Medical, Shijiazhuang 050200, China
| | - Xia Liang
- Hebei University of Chinese Medical, Shijiazhuang 050200, China
| | - Yu-Guang Zheng
- Hebei University of Chinese Medical, Shijiazhuang 050200, China
| | - Jing Wang
- Hebei University of Chinese Medical, Shijiazhuang 050200, China
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Dai X, Li JP, Li WQ, Feng JM. [Changes of Neutrophil CD64 in Patients with Hematological Mali-gnancies Combined with Bacterial Infections]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2017; 25:577-581. [PMID: 28446314 DOI: 10.7534/j.issn.1009-2137.2017.02.048] [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 changes of CD64 on surface of neutrophils in patients with hematological malignancies combined with bacterial infections. METHODS Ninety-seven patients with hematological tumor admitted in our hospital from August 2014 to February 2016 were selected and divided into 2 groups: infection group(50 cases) and noninfection group(47 cases) according to their symptoms, physical sings and blood culture results for microbiologic detection. The CD46 index on surface of neutrophils, serum C- reactive protein (CRP), neutrophil count (NC) and procalcitonin (PCT) level were detected by flow cytometry. After treatment of infection patients, the CD46 index, CRP, PCT and NC were detected again. RESULTS Before antibacterial treatment of patients, the CD64 index in infection group was significantly higher than that in noninfection group, the CRP, PCT and NC levels in infection group also were higher than those in noninfection group; after antibacterial treatment, the CD64 index, CRP, PCT and NC levels in infection group decresed. CONCLUSION The CD64 index in hematologic malignancy patients complicated with bacterial infections significantly increased, after antibacterial treatment these indexes decreases, confirming the value of CD64 in the diagnosis of bacterial infections for patients with hematologic malignancies.
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Affiliation(s)
- Xin Dai
- Department of Hematology and Rheumatology, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China
| | - Jian-Ping Li
- Department of Hematology and Rheumatology, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China
| | - Wen-Qian Li
- Department of Hematology and Rheumatology, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China
| | - Jian-Ming Feng
- Department of Hematology and Rheumatology, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China.E-mail:
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Dai X, Li WQ, Li JP, Feng JM. [Significance of Plasma HMGB1, IFN-γ, IL-4 and TLR4 Expression on CD4 +T Cell Surface in Patients with Immune Thrombocytopenia]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2016; 24:1837-1841. [PMID: 28024504 DOI: 10.7534/j.issn.1009-2137.2016.06.040] [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 investigate the effects of plasma HMGB1, IFN-γ, IL-4 and CD4+T cell surface TLR4 expression on the immune thrombocytopenia(ITP). METHODS Twenty-five patients diagnosed as ITP in our hospital from October 2014 to October 2015, and 20 healthy persons as controls were selected. The ELISA was used to detect the plasma levels of HMGB1, IFN-γ and IL-4 in 2 groups; the flow cytometry was used to detect the expression level of TLR4 on the surface of CD4+ cells. The relatienship between different parameters was analyzed. RESULTS Before treatment, the plasma HMGB1 level in ITP group was significantly higher than that in control group (t=4.259, P<0.01), while after treatment it significantly decreased and close to level in control group (t=1.267, P>0.05). The plasma IFN-γ level detected in ITP group before and after treatment was not significantly different from level in control group (P>0.05), while the IL-4 level in ITP group before treatment was significantly lower than that in control grup (t=2.107, P<0.05), but the IL-4 level in ITP group after treatment was significantly higher than that in control group (t=2.107, P<0.05). The plasma IFN-γ/IL-4 ratio in ITP group before treatment was significantly higher than that in control group (t=5.436, P<0.01), but it obviously decreased and was slightly lower than that in control group after treatment. The expression level of TLR4 in ITP group before and after treatment was all significantly lower than that in control group (P<0.01). The HMGB1 level in ITP group was directly proportional to the CD3+ content (r=0.824, P<0.01), however it not significantly related with CD4+ content (r=0.074, P>0.05), but than the HMGB1 level in ITP group was directly proportional to CD8+ content (r=0.844, P<0.01) and to IL-4 content (r=0.784, P<0.01), and was inversely proportional to IFN-γ level(r=-0.814,P<0.01),and also was inversely proportional to IFN-γ /IL-4 ratio(r=-0.887,P<0.01),and directly proportional to TLR4 expression level(r=0.772,P<0.01). CONCLUSION The HMGB1 and TLR4 expression levels in ITP patients are higher, and clinical therapy can relieve the disease by targetly control in HMGB1 and TLR4 expression.
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Affiliation(s)
- Xin Dai
- Department of Hematology and Rheumatism, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China
| | - Wen-Qian Li
- Department of Hematology and Rheumatism, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China
| | - Jian-Ping Li
- Department of Hematology and Rheumatism, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China
| | - Jian-Ming Feng
- Department of Hematology and Rheumatism, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China. E-mail:
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Zhang RY, Yang W, Zhang K, Feng J, Zhu CX, Xia XC, He S, Feng JM, Liu ZY, Yang MB. An unusual transition from point-like to fibrillar crystals in injection-molded polyethylene articles induced by lightly cross-linking and melt penetration. RSC Adv 2015. [DOI: 10.1039/c4ra16444j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Recently, an unusual transition from point-like to fibrillar crystals has been realized by lightly cross-linking structure and melt penetration.
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8
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Feng JM, Liu XQ, Bao RY, Yang W, Xie BH, Yang MB. Suppressing phase coarsening in immiscible polymer blends using nano-silica particles located at the interface. RSC Adv 2015. [DOI: 10.1039/c5ra13637g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Coalescence suppressing effect of nanoparticles at the interface of polymer blends.
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Affiliation(s)
- Jian-Ming Feng
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Xi-Qiang Liu
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Rui-Ying Bao
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Wei Yang
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Bang-Hu Xie
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
| | - Ming-Bo Yang
- College of Polymer Science and Engineering
- Sichuan University
- State Key Laboratory of Polymer Materials Engineering
- Chengdu
- China
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Jiang BL, Li JP, Li WQ, Feng JM. [Role of CD8(+)T cells and their secreted cytokines in the pathogenesis of aplastic anemia]. Zhongguo Shi Yan Xue Ye Xue Za Zhi 2014; 22:569-72. [PMID: 24763045 DOI: 10.7534/j.issn.1009-2137.2014.02.057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Aplastic anemia(AA) is mostly considered as an immune-mediated bone marrow failure syndrome, characterized by pancytopenia and bone marrow hypoplasia. The pathogenesis of AA is complicated, until now it is not fully understood. Further study on the pathological mechanism will be helpful for the diagnosis and treatment of AA. CD8(+) T cells and their secreted cytokines play important roles in the abnormal immunity during the process of AA. Thus, this review focuses on the role of CD8(+) T cells and their secreted cytokines in the pathogenesis of AA.
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Affiliation(s)
- Bai-Li Jiang
- Medical College of Qinghai University, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China
| | - Jian-Ping Li
- Department of Hematology, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China
| | - Wen-Qian Li
- Department of Hematology, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China
| | - Jian-Ming Feng
- Department of Hematology, Qinghai Provincial People's Hospital, Xining 810007, Qinghai Province, China. E-mail:
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Zhang RY, Yang W, Wu JJ, Feng J, Feng JM, Xie BH, Yang MB. Hierarchically oriented crystalline structures of HDPE induced by strong second melt penetration. RSC Adv 2014. [DOI: 10.1039/c4ra03404j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Xia XC, Zhang QP, Wang L, He S, Feng JM, Yang MB. Extension of the orientation region of high density polyethylene molded by gas-assisted injection molding: control of the thermal field. POLYM INT 2014. [DOI: 10.1002/pi.4743] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Xiao-Chao Xia
- College of Polymer Science and Engineering and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 Sichuan PR China
| | - Quan-Ping Zhang
- College of Polymer Science and Engineering and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 Sichuan PR China
| | - Long Wang
- College of Polymer Science and Engineering and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 Sichuan PR China
| | - Shan He
- College of Polymer Science and Engineering and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 Sichuan PR China
| | - Jian-Ming Feng
- College of Polymer Science and Engineering and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 Sichuan PR China
| | - Ming-Bo Yang
- College of Polymer Science and Engineering and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 Sichuan PR China
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Xia XC, Zhang QP, Wang L, Feng JM, Fu XR, Yang MB. Role of gas cooling time on crystalline morphology and mechanical property of the HDPE parts prepared by gas-assisted injection molding. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-013-3152-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Wang L, Yang B, Yin B, Sun N, Feng JM, Yang MB. Thermorheology and Crystallization Behaviors of Polyethylenes: Effect of Molecular Attributes. J MACROMOL SCI B 2013. [DOI: 10.1080/00222348.2012.660094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Long Wang
- a College of Polymer Science & Engineering, and State Key Laboratory of Polymer, Materials Engineering , Sichuan University , Chengdu , P.R. China
| | - Bin Yang
- b College of Chemistry and Chemical Engineering , Anhui University , Hefei , P.R. China
| | - Bo Yin
- a College of Polymer Science & Engineering, and State Key Laboratory of Polymer, Materials Engineering , Sichuan University , Chengdu , P.R. China
| | - Nan Sun
- a College of Polymer Science & Engineering, and State Key Laboratory of Polymer, Materials Engineering , Sichuan University , Chengdu , P.R. China
| | - Jian-Ming Feng
- a College of Polymer Science & Engineering, and State Key Laboratory of Polymer, Materials Engineering , Sichuan University , Chengdu , P.R. China
| | - Ming-Bo Yang
- a College of Polymer Science & Engineering, and State Key Laboratory of Polymer, Materials Engineering , Sichuan University , Chengdu , P.R. China
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14
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Wang L, Zhang QP, Wang JH, Yang B, Yang MB, Feng JM. Effects of annealing on the hierarchical crystalline structures and mechanical properties of injection-molded bars of high-density polyethylene. POLYM INT 2013. [DOI: 10.1002/pi.4505] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Long Wang
- College of Polymer Science and Engineering, and State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 PR China
| | - Quan-Ping Zhang
- College of Polymer Science and Engineering, and State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 PR China
| | - Jia-Hui Wang
- College of Polymer Science and Engineering, and State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 PR China
| | - Bin Yang
- College of Chemistry and Chemical Engineering, and Key Laboratory of Environment Friendly Polymeric Materials of Anhui Province; Anhui University; Hefei 230601 PR China
| | - Ming-Bo Yang
- College of Polymer Science and Engineering, and State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 PR China
| | - Jian-Ming Feng
- College of Polymer Science and Engineering, and State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 PR China
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Xu L, Feng JM, Li JX, Zhu JM, Song SS, Tong LJ, Chen Y, Lian FL, Lin DH, Ding J, Miao ZH. Abstract 878: Tanshinone-1 kills multidrug resistant tumor cells via reducing phospho-705-Stat3, potentiated by inhibiting secondary activation of signaling networks. Cancer Res 2013. [DOI: 10.1158/1538-7445.am2013-878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
One of the severest hurdles in cancer treatment is multidrug resistance (MDR), resulting from overexpression of drug transporters and/or deregulation of cellular signaling transduction. Persistent efforts have been made to find new agents and strategies to overcome MDR. MDR involves almost all clinically-used anticancer drugs with natural origins. In this study, however, we found that the natural product tanshinone-1 could circumvent MDR via reducing phospho-705-Stat3, potentiated by inhibiting secondary activation of signaling networks. Tanshinone-1 is a bioactive ingredient in traditional Chinese medicine that exhibits diverse biologic properties, including anticancer properties. Tanshinone-1 displayed equipotent or even more potent cytotoxicity in three MDR tumor cell lines than in their corresponding parental cell lines. Tanshinone-1 induced apoptosis of the MDR cells by activating the intrinsic apoptotic pathway via disturbing mitochondria membrane potential and eliciting the cleavage of caspase-9 and caspase-3. The killing of MDR cells by tanshinone-1 was independent of drug transporters, but correlated tightly with its decreasing phospho-705-Stat3, highly possibly via activating certain phosphatase(s). The expression of the target genes of Stat3 including Mcl-1, cyclin D1, cIAP-2 and c-myc, was downregulated by the treatment with tanshinone-1. Knockdown of stat3 expression with specific small interfering RNA led to reduced sensitivity of the tested MDR cells to tanshinone-1. Treatment with Na3VO4, a pan inhibitor of phosphatases, completely reversed tanshinone-1-induced decrease of phospho-705-Stat3 and significantly lowered its cytotoxicity. Knockdown of phosphatase SHP-2 or PTP1B prevented reduction of phospho-705-Stat3 and induction of cell apoptosis driven by tanshinone-1. Further investigation revealed that tanshinone-1 activated signaling networks involving Akt, p38 and Erk pathways, possibly secondary to its reducing phospho-705-Stat3. Notably, simultaneous suppression of those pathways enhanced the cytotoxic effect of tanshinone-1 against the tested MDR cells. Cotreatment of the PI3K inhibitor PI103, the p38 inhibitor SB203580 and/or the MEK inhibitor AZD6244 with tanshinone-1 potentiated its apoptotic induction. However, PI103 and SB580203 appeared to show more potent synergism than AZD6244 when combined with tanshinone-1. Together, this study presents tanshinone-1 as an MDR-overcoming natural product, and more importantly, from our results, a therapeutic strategy of targeting signaling network(s) may evolve for MDR cancer therapy.
Citation Format: Lei Xu, Jian-Ming Feng, Jia-Xin Li, Jin-Mei Zhu, Shan-Shan Song, Lin-Jiang Tong, Yi Chen, Fu-Lin Lian, Dong-Hai Lin, Jian Ding, Ze-Hong Miao. Tanshinone-1 kills multidrug resistant tumor cells via reducing phospho-705-Stat3, potentiated by inhibiting secondary activation of signaling networks. [abstract]. In: Proceedings of the 104th Annual Meeting of the American Association for Cancer Research; 2013 Apr 6-10; Washington, DC. Philadelphia (PA): AACR; Cancer Res 2013;73(8 Suppl):Abstract nr 878. doi:10.1158/1538-7445.AM2013-878
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Affiliation(s)
- Lei Xu
- 1Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Jian-Ming Feng
- 1Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Jia-Xin Li
- 1Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Jin-Mei Zhu
- 1Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Shan-Shan Song
- 1Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Lin-Jiang Tong
- 1Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Yi Chen
- 1Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Fu-Lin Lian
- 2NMR Laboratory, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Dong-Hai Lin
- 2NMR Laboratory, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Jian Ding
- 1Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
| | - Ze-Hong Miao
- 1Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
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Wang L, Yang MB, Zhang QP, Zhang RY, Wu JJ, Feng JM. Hierarchical crystalline structures and dynamic mechanical properties of injection-molded bars of HDPE: attributes of temperature field. POLYM ADVAN TECHNOL 2013. [DOI: 10.1002/pat.3114] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Long Wang
- College of Polymer Science and Engineering, and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 P.R. China
| | - Ming-Bo Yang
- College of Polymer Science and Engineering, and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 P.R. China
| | - Quan-Ping Zhang
- College of Polymer Science and Engineering, and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 P.R. China
| | - Rui-Yan Zhang
- College of Polymer Science and Engineering, and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 P.R. China
| | - Jing-Jing Wu
- College of Polymer Science and Engineering, and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 P.R. China
| | - Jian-Ming Feng
- College of Polymer Science and Engineering, and the State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 P.R. China
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17
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Feng JM, Miao ZH, Jiang Y, Chen Y, Li JX, Tong LJ, Zhang J, Huang YR, Ding J. Characterization of the conversion between CD133+ and CD133- cells in colon cancer SW620 cell line. Cancer Biol Ther 2012; 13:1396-406. [PMID: 22954703 DOI: 10.4161/cbt.22000] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
The state of cancer stem cells (CSC) under reversible fluctuations, which has been revealed in breast cancer cells most recently, suggests that subpopulations with distinct phenotypes and functions within cancer cells can undergo inter-conversion. To investigate the possibility in colon cancer cells, we employed CD133 as the CSC marker, and characterized CD133 expression pattern and the biological features of the CD133 (+) and CD133 (-) subsets. Flow cytometry revealed that CD133 was bimodally expressed in SW620 cells among eight colon cancer cell lines. The CD133 (+) clonal SW620 cells displayed a differential gene expression profile, higher cellular reactive oxygen species (ROS), enhanced tumorigenesis and resistance to 5-fluorouracil. The conversion in term of the CD133 phenotype of the sorted cells was observed in vitro and in vivo. The fraction of the CD133 (+) cells decreased from 99% to 80% in the sorted CD133 (+) population while rising from 5 to 10% in the sorted CD133 (-) population during the first 20-day cultivation and then stayed almost unchanged. A fraction (about 20%) of the CD133 (+) clonal cells lost their CD133 marker while about 10% of the CD133 (-) clonal cells acquired the CD133 marker. 5-Azacytidine enhanced the fraction of the CD133 (+) cells in both of the CD133 (+) and CD133 (-) clonal cells. Our data demonstrate that CD133 expression is dynamic and reversible, and reveal the inter-conversion between the CD133 (+) and the CD133 (-) SW620 cells, suggesting that the CD133 phenotype of SW620 cell population is retained by the conversion between the two cell subsets.
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Affiliation(s)
- Jian-Ming Feng
- Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai, China
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18
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Sun N, Yang B, Wang L, Feng JM, Yin B, Zhang K, Yang MB. Crystallization behavior and molecular orientation of high density polyethylene parts prepared by gas-assisted injection molding. POLYM INT 2012. [DOI: 10.1002/pi.3221] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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19
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Nelson PL, Zolochevska O, Figueiredo ML, Soliman A, Hsu WH, Feng JM, Zhang H, Cheng H. Regulation of Ca(2+)-entry in pancreatic α-cell line by transient receptor potential melastatin 4 plays a vital role in glucagon release. Mol Cell Endocrinol 2011; 335:126-34. [PMID: 21238535 DOI: 10.1016/j.mce.2011.01.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 01/04/2011] [Accepted: 01/06/2011] [Indexed: 10/18/2022]
Abstract
Elevation in the intracellular Ca(2+) concentration stimulates glucagon secretion from pancreatic α-cells. The Transient Receptor Potential Melastatin 4 channel (TRPM4) is critical for Ca(2+) signaling. However, its role in glucagon secreting α-cells has not been investigated. We identified TRPM4 gene expression and protein in the αTC1-6 cell line using RT-PCR and immunocytochemistry. Furthermore, we performed a detailed biophysical characterization of the channel using the patch-clamp technique to confirm that currents typical for TRPM4 were present in αTC1-6 cells. To investigate TRPM4 function, we generated a stable knockdown clone using shRNA and a lentiviral vector. Inhibition of TRPM4 significantly reduced the responses to different agonists during Ca(2+) imaging analysis with Fura-2AM. The reduction in the magnitude of Ca(2+) signals resulted in decreased glucagon secretion. These results suggested that depolarization by TRPM4 may play an important role in controlling glucagon secretion from α-cells and perhaps glucose homeostasis.
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Affiliation(s)
- P L Nelson
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Skip Bertman Drive, Baton Rouge, LA 70803, USA
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Zhou ZL, Luo ZG, Yu B, Jiang Y, Chen Y, Feng JM, Dai M, Tong LJ, Li Z, Li YC, Ding J, Miao ZH. Increased accumulation of hypoxia-inducible factor-1α with reduced transcriptional activity mediates the antitumor effect of triptolide. Mol Cancer 2010; 9:268. [PMID: 20932347 PMCID: PMC2958983 DOI: 10.1186/1476-4598-9-268] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2010] [Accepted: 10/11/2010] [Indexed: 01/08/2023] Open
Abstract
Background Hypoxia-inducible factor-1α (HIF-1α), a critical transcription factor to reduced O2 availability, has been demonstrated to be extensively involved in tumor survival, aggressive progression, drug resistance and angiogenesis. Thus it has been considered as a potential anticancer target. Triptolide is the main principle responsible for the biological activities of the Traditional Chinese Medicine tripterygium wilfordii Hook F. Triptolide possesses great chemotherapy potential for cancer with its broad-spectrum anticancer, antiangiogenesis, and drug-resistance circumvention activities. Numerous biological molecules inhibited by triptolide have been viewed as its possible targets. However, the anticancer action mechanisms of triptolide remains to be further investigated. Here we used human ovarian SKOV-3 cancer cells as a model to probe the effect of triptolide on HIF-1α. Results Triptolide was observed to inhibit the proliferation of SKOV-3 cells, and meanwhile, to enhance the accumulation of HIF-1α protein in SKOV-3, A549 and DU145 cells under different conditions. Triptolide did not change the kinetics or nuclear localization of HIF-1α protein or the 26 S proteasome activity in SKOV-3 cells. However, triptolide was found to increase the levels of HIF-1α mRNA. Unexpectedly, the HIF-1α protein induced by triptolide appeared to lose its transcriptional activity, as evidenced by the decreased mRNA levels of its target genes including VEGF, BNIP3 and CAIX. The results were further strengthened by the lowered secretion of VEGF protein, the reduced sprout outgrowth from the rat aorta rings and the inhibitory expression of the hypoxia responsive element-driven luciferase reporter gene. Moreover, the silencing of HIF-1α partially prevented the cytotoxicity and apoptosis triggered by triptolide. Conclusions The potent induction of HIF-1α protein involved in its cytotoxicity, together with the suppression of HIF-1 transcriptional activity, indicates the great therapeutic potential of triptolide as an anticancer drug. Meanwhile, our data further stress the possibility that HIF-1α functions in an unresolved nature or condition.
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Affiliation(s)
- Zhao-Li Zhou
- Division of Antitumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China
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21
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Marigo V, Courville K, Hsu WH, Feng JM, Cheng H. TRPM4 impacts on Ca2+ signals during agonist-induced insulin secretion in pancreatic beta-cells. Mol Cell Endocrinol 2009; 299:194-203. [PMID: 19063936 DOI: 10.1016/j.mce.2008.11.011] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 10/02/2008] [Accepted: 11/06/2008] [Indexed: 12/22/2022]
Abstract
TRPM4 is a Ca(2+)-activated non-selective cation (CAN) channel that functions in cell depolarization, which is important for Ca(2+) influx and insulin secretion in pancreatic beta-cells. We investigated TRPM4 expression and function in the beta-cell lines HIT-T15 (hamster), RINm5F (rat), beta-TC3 (mouse), MIN-6 (mouse) and the alpha-cell line INR1G9 (hamster). By RT-PCR, we identified TRPM4 transcripts in alpha- and beta-cells. Patch-clamp recordings with increasing Ca(2+) concentrations resulted in a dose-dependent activation of TRPM4 with the greatest depolarizing currents recorded from hamster-derived cells. Further, Ca(2+) imaging experiments revealed that inhibition of TRPM4 by a dominant-negative effect significantly decreased the magnitude of the Ca(2+) signals generated by agonist stimulation compared to control cells. The decrease in the [Ca(2+)](i) resulted in reduced insulin secretion. Our data suggest that depolarizing currents generated by TRPM4 are an important component in the control of intracellular Ca(2+) signals necessary for insulin secretion and perhaps glucagon from alpha-cells.
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Affiliation(s)
- V Marigo
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
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22
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Feng JM, Zhu H, Zhang XW, Ding J, Miao ZH. Proteasome-dependent degradation of Chk1 kinase induced by the topoisomerase II inhibitor R16 contributes to its anticancer activity. Cancer Biol Ther 2008; 7:1726-31. [PMID: 18787399 DOI: 10.4161/cbt.7.11.6728] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The novel naphthalimide derivative R16 has been demonstrated to exhibit potent in vitro and in vivo anticancer activity by inhibiting topoisomerase II (Top2). R16 induces G(2) arrest via an ATM-activated Chk2-executed pathway, accompanied by reducing Chk1. In this study, R16 was demonstrated to trigger time and concentration-dependent Chk1 reduction which was unrelated to the mRNA level and HSP90-involved degradation. Pretreatment of HCT116 cells with the proteasome inhibitors MG132 or lactacystin prevented Chk1 decline induced by R16, accompanied by significant accumulation of ubiquitinated Chk1 protein, indicating the involvement of ubiquitin-proteasome pathway. Meanwhile, R16 also resulted in loss of Chk1 function. By site-specifically mutating the phosphorylation sites of Chk1 protein at Ser317 or at Ser345, we further demonstrated that R16-triggered Chk1 reduction was associated with its apoptotic induction and cell killing. In conclusion, the data reveal that the novel Top2 inhibitor R16 induces degradation of Chk1 via the ubiquitin-proteasome pathway, impairing the function of Chk1 and thus contributing to the anticancer activity of R16.
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Affiliation(s)
- Jian-Ming Feng
- Division of Anti-tumor Pharmacology, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, PR China
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23
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Feng JM, Givogri IM, Bongarzone ER, Campagnoni C, Jacobs E, Handley VW, Schonmann V, Campagnoni AT. Thymocytes express the golli products of the myelin basic protein gene and levels of expression are stage dependent. J Immunol 2000; 165:5443-50. [PMID: 11067896 DOI: 10.4049/jimmunol.165.10.5443] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The golli products of the myelin basic protein gene have been shown to be expressed in mouse thymus and brain. The full repertoire of thymic cell types expressing golli products has not yet been determined, although immunoreactivity has been found in some macrophages. We have analyzed the cellular expression of golli mRNAs and proteins in the thymus. The results showed that MTS5(+) cortical/MTS10(+) medullary epithelial cells and NLDC145(+) dendritic cells did not express golli, while some macrophages did exhibit strong immunoreactivity. GOLLI: mRNAs were not detected in macrophages by in situ hybridization. Thymocytes expressed significant levels of golli mRNAs and proteins by in situ hybridization and immunohistochemistry. Interestingly, golli immunoreactivity varied with thymocyte stage of differentiation. For example, CD4(-)CD8(-) (double-negative) thymocytes expressed relatively high levels of golli. Upon further differentiation into CD4(-)CD8(-) (double-positive) thymocytes, golli protein expression declined dramatically. When thymocytes developed into CD8(-) or CD4(+) (single-positive) thymocytes, golli protein expression increased again, but it never achieved the levels found in double-negative thymocytes. Thus, the altered levels of expression of golli proteins in developing thymocytes correlated with the transitions from double-negative to double-positive and double-positive to single-positive stages. The lack of significant golli expression in thymic stromal cells may offer an alternative explanation for the mechanism of inefficient negative selection of those autoreactive thymocytes with specificity for myelin basic proteins.
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Affiliation(s)
- J M Feng
- Developmental Biology Group, Neuropsychiatric Institute, and Brain Research Institute, University of California Medical School, Los Angeles, CA 90024, USA
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Yang BC, Weng J, Li XD, Yang ZJ, Feng JM, Chen JY, Zhang XD. Preliminary study on HA coating percutaneously implanted in bone. Int J Artif Organs 1999; 22:713-8. [PMID: 10585137] [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: 02/14/2023]
Abstract
A comparative investigation on the possibility of hydroxyapatite (HA) coating and pure Ti column to form biological sealing with skin tissue was completed in this study. HA coating and pure Ti column were percutaneously implanted in the tibia of rabbits. Compared with titanium (Ti) implant, HA coating forms epithelial sealing with skin tissue at 6 weeks postoperatively, while the Ti implant may loosen from the implanted site and be lost. The Ti column loosing rate at this time was 50%. However, once the Ti implant becomes fixed with the bone tissue, it can form epithelial sealing with skin tissue just like the HA coating, at 8 weeks postoperatively. At 8 weeks postoperatively, the epithelial sealing is not destroyed in spite of the fact that the HA coating is biodegraded. Our results show that the HA coating can become fixed with the bone faster than the Ti, which is beneficial for epithelial sealing formation. The main role of HA coating for epithelial sealing is beneficial for sealing at the initial period after it is implanted.
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Affiliation(s)
- B C Yang
- Institute of Materials Science and Technology, Sichuan University, Chengdu, China.
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25
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Feng JM, Wu JS. [Morphological evidence for thymocytes apoptosis outside the thymus]. Shi Yan Sheng Wu Xue Bao 1998; 31:29-39. [PMID: 12014110] [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: 02/25/2023]
Abstract
In vitro thymus explants culture designed in this paper can mimic the thymic microenvironment as it were in vivo. Theoretically, thymus explants are cut off free from blood stream. So if some developing or developed thymocytes had the inclination to migrate into the periphery, they would only be accumulated in the blood vessels within thymus explants. After 3-day's culture, under transmission electron microscope we observed the migrating thymocytes accumulated in the blood vessels of C57BL/6 mice thymus explants, and these thymocytes were occurring apoptosis at different stage. To our knowledge, this findings offers the first morphological evidence that thymocytes do not necessarily die inside the thymus in situ, and that having acquired the death signals thymocytes can migrate into the blood stream and die quickly outside the thymus. But this is not to say that we deny the intrathymic death hypothesis. On the contrary, we found the number of thymocytes occurring in situ apoptosis on the surfaces of stromal cells is far more than that of migrating into the blood vessels. So, our proposal is that there are two sites for thymocytes apoptosis, some die inside the thymus and the others die outside the thymus.
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Affiliation(s)
- J M Feng
- Department of Histology and Embryology, Beijing Medical University, Beijing 100083, P. R. China
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