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Zhao Q, Yang LJ, Zheng YB, Gong JH. [Programmed Necrosis Inducers for Cancer Treatment]. Zhongguo Yi Xue Ke Xue Yuan Xue Bao 2022; 44:338-347. [PMID: 35538772 DOI: 10.3881/j.issn.1000-503x.13241] [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] [Indexed: 06/14/2023]
Abstract
Programmed necrosis,a mode of cell death independent of Caspase,is mainly mediated by receptor-interacting protein kinase-1 (RIPK1),receptor-interacting protein kinase-3 (RIPK3),and mixed lineage kinase domain-like protein (MLKL).Studies have demonstrated that programmed necrosis has the dual role of promoting and inhibiting tumor growth and thus we can control the development of tumor by regulating programmed necrosis.The drugs capable of inducing programmed necrosis show potential anti-tumor activity.In addition,inducing programmed necrosis is an effective way to overcome tumor resistance to apoptosis.This paper summarized the mechanisms of programmed necrosis and its relationship with tumors.We focused on the antitumor activity of programmed necrosis inducers including natural products,chemotherapeutic drugs,death receptor ligands,kinase inhibitors,inorganic salts,metal complexes,and metal nanoparticles.These agents will provide new therapeutic candidates for the treatment of tumors,especially the tumors acquiring resistance to apoptosis.
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Affiliation(s)
- Qi Zhao
- Department of Pharmacology,Shanxi Medical University,Taiyuan 030001,China
| | - Li-Jun Yang
- Department of Pharmacology,Shanxi Medical University,Taiyuan 030001,China
| | - Yan-Bo Zheng
- Department of Oncology,Institute of Medicinal Biotechnology,CAMS and PUMC,Beijing 100050,China
| | - Jian-Hua Gong
- Department of Oncology,Institute of Medicinal Biotechnology,CAMS and PUMC,Beijing 100050,China
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Zheng YB, Dong YQ, Si SY, Zhen YS, Gong JH. IMB5476, a novel microtubule inhibitor, induces mitotic catastrophe and overcomes multidrug resistance in tumors. Eur J Pharmacol 2022; 919:174802. [PMID: 35143830 DOI: 10.1016/j.ejphar.2022.174802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2021] [Revised: 01/22/2022] [Accepted: 02/02/2022] [Indexed: 02/07/2023]
Abstract
IMB5046 is a nitrobenzoate microtubule inhibitor we reported previously. During screening of its structural analogues, we identified a novel compound IMB5476 with increased aqueous solubility. Here, its antitumor activity and the underlying mechanism were investigated. IMB5476 disrupted microtubule networks in cells and arrested cell cycle at G2/M phase. It inhibited purified tubulin polymerization in vitro. Competition assay indicated that it bound to tubulin at the colchicine pocket. Further experiments proved that it induced cell death by mitotic catastrophe and apoptosis. Notably, it was a poor substrate of P-glycoprotein and exhibited potent cytotoxicity against drug-resistant tumor cells. In addition, IMB5476 could inhibit angiogenesis in vitro. IMB5476 also inhibited the growth of drug-resistant KBV200 xenografts in mice. Conclusively, our data reveal a novel nitrobenzoate microtubule inhibitor with improved aqueous solubility and can overcome multidrug resistance.
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Affiliation(s)
- Yan-Bo Zheng
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Yan-Qun Dong
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Shu-Yi Si
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yong-Su Zhen
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jian-Hua Gong
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
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Wang X, Auyeung B, Pan N, Lin LZ, Chen Q, Chen JJ, Liu SY, Dai MX, Gong JH, Li XH, Jing J. Empathy, Theory of Mind, and Prosocial Behaviors in Autistic Children. Front Psychiatry 2022; 13:844578. [PMID: 35401285 PMCID: PMC8990907 DOI: 10.3389/fpsyt.2022.844578] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 03/04/2022] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Previous research has suggested that children with autism spectrum disorder (ASD) display fewer prosocial behaviors, and the role of empathy or Theory of Mind (ToM) in prosocial behaviors of autistic children remains unclear. METHODS Data were obtained from an ongoing longitudinal study in Guangzhou, China. A total of 96 autistic children and 167 typically developing (TD) children were enrolled. Prosocial behaviors were assessed using a subscale of the Strength and Difficulties Questionnaire and Dictator Game (DG) paradigm with stickers as incentives. Empathic traits and ToM ability were measured using the children's Empathy Quotient and the Chinese version of ToM toolkit. Generalized linear models were used to assess the differences of prosocial behaviors and empathic traits, ToM ability between the two groups and the associations between empathic traits, ToM ability and prosocial behaviors in autistic children. RESULTS Compared with TD children, autistic children exhibited worse ToM ability and performed less pro-socially in the DG paradigm, while there were no differences regarding empathic traits. In autistic children, empathic traits especially affective empathy, were positively associated with parent-reported prosocial behaviors [β = 0.17, 95% confidence interval (CI): 0.07-0.27; β = 0.47, 95%CI: 0.33-0.60]. ToM ability was associated with DG paradigm (β = 1.03, 95%CI: 0.16-1.89). CONCLUSION Autistic children showed less pro-sociality and ToM ability than TD children. In autistic children, empathic trait was associated with parent-reported prosocial behaviors while their ToM ability was associated with prosocial behaviors in experimental condition. Our findings indicated that better ToM ability and empathic trait might promote prosocial behaviors in autistic children.
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Affiliation(s)
- Xin Wang
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Bonnie Auyeung
- Department of Psychology, School of Philosophy, Psychology and Language Sciences, University of Edinburgh, Edinburgh, United Kingdom.,Autism Research Centre, Department of Psychiatry, University of Cambridge, Cambridge, United Kingdom
| | - Ning Pan
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Li-Zi Lin
- Guangdong Provincial Engineering Technology Research Center of Environmental Pollution and Health Risk Assessment, Department of Occupational and Environmental Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Qian Chen
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Jia-Jie Chen
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Si-Yu Liu
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Mei-Xia Dai
- Department of Children's Healthcare and Mental Health Center, Shenzhen Children's Hospital, Shenzhen, China
| | - Jian-Hua Gong
- Maternity and Children Health Care Hospital of Luohu District, Shenzhen, China
| | - Xiu-Hong Li
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
| | - Jin Jing
- Department of Maternal and Child Health, School of Public Health, Sun Yat-sen University, Guangzhou, China
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Shan CK, Du YB, Zhai XT, Wang YX, Li Y, Gong JH, Ge ZJ, Liu XJ, Zhen YS. Pingyangmycin enhances the antitumor efficacy of anti-PD-1 therapy associated with tumor-infiltrating CD8 + T cell augmentation. Cancer Chemother Pharmacol 2021; 87:425-436. [PMID: 33388950 DOI: 10.1007/s00280-020-04209-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 11/20/2020] [Indexed: 11/28/2022]
Abstract
PURPOSE To investigate the antitumor efficacy of pingyangmycin (PYM) in combination with anti-PD-1 antibody and determine the capability of PYM to induce immunogenic cell death (ICD) in cancer cells. METHODS The murine 4T1 breast cancer and B16 melanoma models were used for evaluation of therapeutic efficacy of the combination of PYM with anti-PD-1 antibody. The ELISA kits were used to quantify the ICD related ATP and HMGB1 levels. The Transwell assay was conducted to determine the chemotaxis ability of THP-1 cell in vitro. The flow cytometry was used to measure reactive oxygen species level and analyze the ratio of immune cell subsets. RESULTS PYM induced ICD in murine 4T1 breast cancer and B16 melanoma cells and increased the release of nucleic acid fragments that may further promote the monocytic chemotaxis. In the 4T1 murine breast cancer model, PYM alone, anti-PD-1 antibody alone, and their combination suppressed tumor growth by 66.3%, 16.1% and 77.6%, respectively. PYM markedly enhanced the therapeutic efficacy of anti-PD-1 antibody against 4T1 breast cancer. The calculated CDI (coefficient of drug interaction) indicated synergistic effect. Evaluated by graphic analysis, the nucleated cells intensity in the femur bone marrow remained unchanged. Histopathological observations revealed no noticeable toxico-pathological changes in the lung and various organs, indicating that the PYM and anti-PD-1 antibody combination exerted enhanced efficacy at well-tolerated dosage level. By the combination treatment, a panel of immunological changes emerged. The ratio of CD3+ cells, NK cells and NKT cells increased and Tregs decreased in peripheral blood. The DCs increased in the spleen. Prominent changes occurred in tumor infiltrating lymphocytes. The ratio of CD8+ cells increased, while that of CD4+ cells decreased; however, the ratio of CD3+ cells remained unchanged, implying that certain immunological responses emerged in the tumor microenvironment. PYM alone could also increase CD8+ cells and reduce CD4+ cells in tumor infiltrating lymphocytes. CONCLUSIONS The studies indicate that PYM, as an ICD inducer with mild myelosuppression effect, may enhance the therapeutic efficacy of anti-PD-1 antibody in association with tumor infiltrating CD8+ T cell augmentation.
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Affiliation(s)
- Chuan-Kun Shan
- NHC Key Laboratory of Biotechnology of Antibiotics, Laboratory of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yi-Bo Du
- NHC Key Laboratory of Biotechnology of Antibiotics, Laboratory of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiao-Tian Zhai
- NHC Key Laboratory of Biotechnology of Antibiotics, Laboratory of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yue-Xuan Wang
- NHC Key Laboratory of Biotechnology of Antibiotics, Laboratory of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yi Li
- NHC Key Laboratory of Biotechnology of Antibiotics, Laboratory of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jian-Hua Gong
- NHC Key Laboratory of Biotechnology of Antibiotics, Laboratory of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Zhi-Juan Ge
- NHC Key Laboratory of Biotechnology of Antibiotics, Laboratory of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiu-Jun Liu
- NHC Key Laboratory of Biotechnology of Antibiotics, Laboratory of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
| | - Yong-Su Zhen
- NHC Key Laboratory of Biotechnology of Antibiotics, Laboratory of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
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He L, Feng QQ, Zhang Q, Zhang B, Wu SS, Gong JH. Protective role of overexpressed MUC5AC against fibrosis in MHV-68-induced combined pulmonary fibrosis and emphysema mouse model. J Med Virol 2020; 92:3726-3735. [PMID: 32557739 DOI: 10.1002/jmv.26094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 03/22/2020] [Revised: 05/19/2020] [Accepted: 05/28/2020] [Indexed: 11/05/2022]
Abstract
Mucins have long been regarded to play a role as a barrier to prevent mucosal infections; however, some studies report that overexpression of mucins induces obstruction and inflammation of airways. We investigated whether the secretion of overexpressed mucin, mucin5ac (MUC5AC), could improve protection against pathogens. To examine the possible roles of mucin hypersecretion in augmenting host defense against disease-promoting muco-obstructive lung disease, a mouse model that overexpressed MUC5AC was generated. We had previously proved that murine gammaherpesvirus-68 (MHV-68) infection could induce emphysema in mice, which later developed into combined pulmonary fibrosis and emphysema (CPFE). We further explored whether increased MUC5AC secretion could provide benefits against MHV-68 induced fibrosis. We initially developed a pcDNA3.1-MUC5AC mouse model. Next, the experimental mice were randomly divided into five groups: normal control, pcDNA3.1 control, pcDNA3.1-MUC5AC, CPFE, and pcDNA3.1- MUC5AC + CPFE. Morphometric analysis of each group was performed by hematoxylin and eosin staining and Masson trichrome staining. MUC5AC levels in lung tissues were analyzed by immunohistochemical staining, real-time polymerase chain reaction, and Western blot analysis. The airway inflammation was determined by differential cell counts of bronchoalveolar lavage fluid (BALF) and measurement of cytokines and chemokines in BALF by enzyme-linked immunosorbent assay. MUC5AC hypersecretion alone was not sufficient to drive goblet cell metaplasia to induce obvious mucus plugging and airway inflammation. However, MUC5AC overexpression served as a protective barrier against MHV-68 virus infection in vivo. Infectivity of MHV-68 was decreased in the pcDNA3.1-MUC5AC + CPFE group compared with that in CPFE group. Meanwhile, a reduction of MHV-68 virus attenuated the expressions of chemokine (C-C motif) ligand 2 (CCL2), chemokine (C-X-C motif) ligand 5 (CXCL5), interleukin-13 (IL-13), and transforming growth factor-β1 (TGF-β1), and weakened airway inflammation and fibrosis in the pcDNA3.1-MUC5AC + CPFE group. Overexpression of MUC5AC appears to exhibit a protective role against MHV-68 infection in mice with emphysema that subsequently developed into CPFE and to further decrease airway inflammation and fibrosis induced by MHV-68 by decreasing the expressions of CCL2, CXCL5, IL-13, and TGF-β1.
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Affiliation(s)
- Li He
- Department of Respiratory and Critical Care Medicine, Jingzhou Hospital of Tongji Medical College, Huazhong University of Science and Technology, Jingzhou, Hubei, China
- Department of Respiratory and Critical Care Medicine, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Qian-Qian Feng
- Department of Respiratory and Critical Care Medicine, Jingzhou Hospital of Tongji Medical College, Huazhong University of Science and Technology, Jingzhou, Hubei, China
| | - Qiao Zhang
- Department of Respiratory and Critical Care Medicine, Jingzhou Hospital of Tongji Medical College, Huazhong University of Science and Technology, Jingzhou, Hubei, China
| | - Bo Zhang
- Department of Respiratory and Critical Care Medicine, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
- Department of Respiratory and Critical Care Medicine, Wuhan Fourth Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Si-Si Wu
- Department of Respiratory and Critical Care Medicine, Tongji Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
- Department of ICU, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Jian-Hua Gong
- Department of Respiratory and Critical Care Medicine, Jingzhou Hospital of Tongji Medical College, Huazhong University of Science and Technology, Jingzhou, Hubei, China
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Zheng YB, Gong JH, Zhen YS. Focal adhesion kinase is activated by microtubule-depolymerizing agents and regulates membrane blebbing in human endothelial cells. J Cell Mol Med 2020; 24:7228-7238. [PMID: 32452639 PMCID: PMC7339229 DOI: 10.1111/jcmm.15273] [Citation(s) in RCA: 4] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Revised: 03/01/2020] [Accepted: 03/27/2020] [Indexed: 12/17/2022] Open
Abstract
Microtubule‐depolymerizing agents can selectively disrupt tumor vessels via inducing endothelial membrane blebbing. However, the mechanism regulating blebbing is largely unknown. IMB5046 is a newly discovered microtubule‐depolymerizing agent. Here, the functions of focal adhesion kinase (FAK) during IMB5046‐induced blebbing and the relevant mechanism are studied. We found that IMB5046 induced membrane blebbing and reassembly of focal adhesions in human vascular endothelial cells. Both FAK inhibitor and knock‐down expression of FAK inhibited IMB5046‐induced blebbing. Mechanism study revealed that IMB5046 induced the activation of FAK via GEF‐H1/ Rho/ ROCK/ MLC2 pathway. cRGD peptide, a ligand of integrin, also blocked IMB5046‐induced blebbing. After activation, FAK further promoted the phosphorylation of MLC2. This positive feedback loop caused more intensive actomyosin contraction and continuous membrane blebbing. FAK inhibitor blocked membrane blebbing via inhibiting actomyosin contraction, and stimulated stress fibre formation via promoting the phosphorylation of HSP27. Conclusively, these results demonstrate that FAK is a molecular switch controlling endothelial blebbing and stress fibre formation. Our study provides a new molecular mechanism for microtubule‐depolymerizing agents to be used as vascular disrupting agents.
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Affiliation(s)
- Yan-Bo Zheng
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Jian-Hua Gong
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Yong-Su Zhen
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
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Gong JH, Zheng YB, Zhang MR, Wang YX, Yang SQ, Wang RH, Miao QF, Liu XJ, Zhen YS. Dexamethasone enhances the antitumor efficacy of Gemcitabine by glucocorticoid receptor signaling. Cancer Biol Ther 2020; 21:332-343. [PMID: 31906826 DOI: 10.1080/15384047.2019.1702399] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Gemcitabine (Gem) is currently used as the first-line therapy for liver and pancreatic cancer but has limited efficacy in most cases. Dexamethasone (Dex) have been applied as a chemoprotectant and chemosensitizer in cancer chemotherapy. This study further explored the potential of combination of Gem and Dex and tested the hypothesis that glucocorticoid receptor signaling is essential for the synergistic antitumor activity. In the HepG2 and AsPC-1 xenograft models, the combination treatment showed a significantly synergistic antitumor activity. Immunohistochemistry of post-treatment tumors showed a significant decrease in proliferation and angiogenesis as compared to either of the treatments alone. Dex alone and the combination with Gem inhibited the expression of glucocorticoid receptor. The combination of Dex and Gem showed synergistic cytotoxicity in cell lines in vitro. The antiproliferative synergism is prevented by used glucocorticoid receptor (GR) small interfering RNA, demonstrating that the glucocorticoid receptor is required for the antiproliferative synergism of Gem and Dex. The inhibition of glucocorticoid receptor signaling pathway and induction of apoptosis via activation of caspases 3, 8 and 9, PARP, contributed to the synergistic effect of this combination therapy. These results demonstrate that Dex could potentiate the antitumor efficacy of Gem. The synergistic antitumor activity of the combination of Dex and Gem was through glucocorticoid receptor signaling. Taken together, a combination of Dex and Gem shows a significant synergistic antitumor activity and lesser toxicity both in vitro and in vivo and could be a combination chemotherapy for the treatment of highly expression of glucocorticoid receptor patients.
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Affiliation(s)
- Jian-Hua Gong
- NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Yan-Bo Zheng
- NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Meng-Ran Zhang
- NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Yue-Xuan Wang
- NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Si-Qi Yang
- NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Rui-Hai Wang
- NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Qing-Fang Miao
- NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Xiu-Jun Liu
- NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Yong-Su Zhen
- NHC Key Laboratory of Biotechnology of Antibiotics, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
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Dong JY, Gong JH, Ji XY, Tian M, Liu YK, Qing C, Lu SL, Song F. [Preliminary evaluation and mechanism of adipose-derived stem cell transplantation from allogenic diabetic rats in the treatment of diabetic rat wounds]. Zhonghua Shao Shang Za Zhi 2019; 35:645-654. [PMID: 31594182 DOI: 10.3760/cma.j.issn.1009-2587.2019.09.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate whether adipose-derived stem cells (ASCs) from allogeneic diabetic rats can promote wound healing in diabetic rats or not and the mechanism. Methods: (1) Fifty-six male Wistar rats aged 12-16 weeks were divided into diabetic group and healthy group according to the random number table (the same grouping method below), with 28 rats in each group. Rats in healthy group were not treated with any treatment. Rats in diabetic group were injected with 10 g/L streptozotocin 60 mg/kg intraperitoneally in one time to establish the diabetic model. Four rats in diabetic group and 4 rats in healthy group were selected according to the random number table, and the adipose tissue in the inguinal region was taken to culture and purify ASCs, so as to obtain healthy rat-derived ASCs (hereinafter referred to as nASCs) and diabetic rat-derived ASCs (hereinafter referred to as dASCs). The third passage of nASCs (n=3) and dASCs (n=3) were taken, and the positive expression rates of cell surface differentiation antigens CD105, CD31, CD34, and CD44 were detected with flow cytometer for defining ASCs purity. (2) The rest 24 rats in healthy group and 24 rats in diabetic group were used to make three round full-thickness skin defect wounds with a diameter of 12 mm on the back of each rat. Immediately after injury, phosphate buffer saline (PBS), nASCs of 2×10(7)/mL, and dASCs of 2×10(7)/mL each in the volume of 0.5 mL were subcutaneously injected into three wounds and their margins of each rat, respectively. On post injury day (PID) 1, 3, 7, and 12, 6 rats in each group were selected according to the random number table to calculate the wound area, and the wound tissue was stained with hematoxylin-eosin to observe the histological morphology of the wound. (3) Human ASCs (hASCs) were subcultured, and the 4th to 7th passage of cells were used for the subsequent experiments. The hASCs were divided into 7 groups, with 12 samples in each group. Cells in blank control group were cultured with mesenchymal stem cell culture medium, and cells in simple advanced glycation end products (AGEs) group, simple protein group, simple high glucose group, simple high osmotic pressure group, AGEs-high glucose combination group, and protein-high osmotic pressure combination group were cultured with mesenchymal stem cell culture medium containing a final mass concentration of 100 mg/L AGEs, 100 mg/L bovine serum albumin (BSA), 28 mmol/L D-glucose, 28 mmol/L mannitol, 100 mg/L AGEs+ 28 mmol/L D-glucose, 100 mg/L BSA+ 28 mmol/L mannitol, respectively. Cell proliferation was detected by cell counting kit 8 at post culture hour (PCH) 2 and on post culture day (PCD) 2, 4 and 6. (4) The hASCs were divided into blank control group, simple AGE group, simple high glucose group, and AGE-high glucose combination group, with 12 samples in each group, which were treated the same as corresponding groups in experiment (3). On PCD 0, 2, 4, and 6, the positive expression rates of cell surface differentiation antigens CD105, CD44, and CD45 were detected by flow cytometer to estimate their homeostasis. (5) The hASCs were divided into AGE-high glucose combination group and protein-high osmotic pressure combination group, with 9 samples in each group, which were treated the same as corresponding groups in experiment (3). On PCD 2, 4, and 6, the expression of intracellular protein was detected by cyanine 3-streptavidin double-antibody sandwich technique. Data were processed with analysis of variance for factorial design, least significant difference test, and Bonferroni correction. Results: (1) The positive expression rates of CD44 in nASCs and dASCs were both higher than 96%, the positive expression rates of CD31 and CD34 were low, and the positive expression rates of CD105 were about 40%, which basically met the purity requirements. (2) The areas of wounds treated by three methods in rats of healthy group and diabetic group were similar on PID 1 (P>0.05). In healthy group, compared with (0.682 1±0.078 9), (0.314 3±0.113 7), and (0.064 3±0.002 1) cm(2) of the PBS-treated wounds in rats, the area of nASCs-treated wounds in rats decreased significantly on PID 3, 7, and 12 [(0.464 1±0.092 6), (0.223 9±0.072 7), and (0.034 3±0.012 5) cm(2), P<0.05], the area of dASCs-treated wounds in rats decreased significantly on PID 3 and 12 [(0.514 1±0.124 1) and (0.043 7±0.032 8) cm(2), P<0.05] but was not obviously changed on PID 7 [(0.274 2±0.062 5) cm(2), P>0.05]. Compared with those of the dASCs-treated wounds of rats within the same group, the area of the nASCs-treated wounds of rats in healthy group decreased significantly on PID 3 and 7 (P<0.05) but was not obviously changed on PID 12 (P>0.05). In diabetic group, compared with (0.853 5±0.204 8), (0.670 5±0.164 8), and (0.131 4±0.074 4) cm(2) of the PBS-treated wounds in rats, the area of nASCs-treated wounds in rats decreased significantly on PID 3, 7, and 12 [(0.633 4±0.132 5), (0.331 8±0.023 5), and (0.074 2±0.003 8) cm(2), P<0.05], the area of dASCs-treated wounds in rats decreased significantly on PID 3 [(0.773 6±0.182 2) cm(2), P<0.05] but was not obviously changed on PID 7 and 12 [(0.510 6±0.192 2) and (0.114 4±0.003 1) cm(2), P>0.05]. Compared with the dASCs-treated wounds of rats within the same group, the area of the nASCs-treated wounds of rats in diabetic group was not obviously changed on PID 3 and 7 (P>0.05) but decreased significantly on PID 12 (P<0.05). There was no obvious difference in histological morphology of the wounds treated with three methods in rats of each group on PID 1. On PID 3, a small amount of microvessels were formed in the wounds treated with nASCs and dASCs of rats in both groups, but microvessel formation was almost undetected in the PBS-treated wounds. On PID 7, more small blood vessels and fibroblasts (Fbs) were observed in the wounds treated with nASCs and dASCs of rats in both groups, but the small blood vessels and Fbs were slightly less in the PBS-treated wounds. On PID 12, the wounds treated with nASCs and dASCs of rats in the two groups were covered by epithelial tissue, the granulation tissue in the PBS-treated wounds of rats in healthy group was not obvious, and the PBS-treated wounds of rats in diabetic group were not completely epithelialized. (3) Compared with those of blank control group, the cell number of hASCs in simple AGEs group decreased significantly on PCD 2, 4, and 6 (P<0.05), which increased significantly on PCD 2 and 4 in simple high glucose group (P<0.05), and that in AGEs-high glucose combination group decreased significantly on PCD 4 and 6 (P<0.05). (4) Compared with that on PCD 4 within the same group, the positive expression rate of CD105 in hASCs decreased significantly in blank control group, simple AGEs group, and AGEs-high glucose combination group on PCD 6 (P<0.05). The positive expression rate of CD44 was higher than 95%, and that of CD45 was less than 2% in hASCs of each group at each time point. (5) Detection values of 7 proteins were located in the confidence interval. The expression levels of basic fibroblast growth factor and tissue inhibitor of metalloproteinase-1 in hASCs of AGEs-high glucose combination group and protein-high osmotic pressure combination group showed increasing trend with the prolongation of culture time. The expression level of human monocyte chemoattractant protein 1 (MCP-1) in hASCs of AGEs-high glucose combination group showed increasing trend with the prolongation of culture time, while the expression level of growth-regulated oncogene (GRO) on PCD 6 was significantly higher than that on PCD 4 within the same group (P<0.05); the expression levels of MCP-1 and GRO in hASCs of protein-high osmotic pressure combination group showed decreasing trend with the prolongation of culture time. The expression level of follistatin in hASCs of protein-high osmotic pressure combination group decreased obviously on PCD 4, while that in hASCs of AGEs-high glucose combination group was significantly lower on PCD 6 than that on PCD 4 (P<0.05). The expression level of vascular endothelial growth factor (VEGF) in hASCs of protein-high osmotic pressure combination group decreased gradually with the prolongation of culture time, while that in hASCs of AGEs-high glucose combination group on PCD 4 decreased significantly as compared with that on PCD 2 (P<0.05). The expression level of urokinase-type plasminogen activator receptor in hASCs of protein-high osmotic pressure combination group on PCD 6 was significantly higher than that on PCD 4 within the same group (P<0.05) and that of AGEs-high glucose combination group on PCD 6 (P<0.05). Conclusions: Both nASCs and dASCs can promote wound healing in rats with simple defect injury, but dASCs have no significant effect on wound healing in rats with diabetes mellitus, which may be related to the inhibition of ASCs proliferation and the influence of high glucose and AGEs intervention on their homeostasis and secretory function.
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Affiliation(s)
- J Y Dong
- Wound Repair Center, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - J H Gong
- Department of Orthopaedics, United Family Healthcare, Shanghai 200336, China
| | - X Y Ji
- Wound Repair Center, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - M Tian
- Wound Repair Center, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Y K Liu
- Wound Repair Center, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - C Qing
- Wound Repair Center, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - S L Lu
- Wound Repair Center, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - F Song
- Wound Repair Center, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
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Zheng JL, Wen HY, Zhang B, Gong JH, Teng Y, Li ZY. Development of Integrated Device of Trace Bloodstains Imaging and Age Analysis. Fa Yi Xue Za Zhi 2019; 35:230-233. [PMID: 31135120 DOI: 10.12116/j.issn.1004-5619.2019.02.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Indexed: 11/30/2022]
Abstract
Abstract Objective To develop a device of trace bloodstains imaging and age analysis, so as to provide a non-destructive, simple and objective method for age estimation of bloodstains at the crime scene. Methods Based on the principle of digital imaging and color pattern analysis, the mobile terminal of the device was used to collect images of bloodstains of different ages. The time-dependent pattern of 6 parameters (R, G, B, C, Y, M) reflecting the changes of color of images of different ages was obtained by computer image analysis. A multiparameter comprehensive inference equation of bloodstains age was established and embedded into the device software to realize the intelligent inference of the bloodstains age. Then the capability and reliability of the device was verified. Results This integrated device of bloodstains imaging and age analysis could quickly collect bloodstains at the crime scene and automatically analyze and infer the age of bloodstains combined with related intelligence software. In the blind test, the detection accuracy of this device was 95% in both natural light airtight group and dark airtight group, and 80% in the natural light ventilation group. Conclusion The integrated device of trace bloodstains imaging and age analysis can be used in a simple manner, which provides a new objective method for bloodstains age estimation.
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Affiliation(s)
- J L Zheng
- Department of Forensic Medicine, Criminal Investigation Police University of China, Shenyang 110035, China
| | - H Y Wen
- Network Information Center, Criminal Investigation Police University of China, Shenyang 110035, China
| | - B Zhang
- Forensic Department of Criminal Technology Center, CID of Shanghai Public Security Bureau, Shanghai 200000, China
| | - J H Gong
- Department of Criminal Technology, Guizhou Police College, Guiyang 550005, China
| | - Y Teng
- Department of Forensic Medicine, Criminal Investigation Police University of China, Shenyang 110035, China
| | - Z Y Li
- Department of Forensic Medicine, Criminal Investigation Police University of China, Shenyang 110035, China.,Raohe Public Security Bureau, Shuangyashan 155700, Heilongjiang Province, China
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10
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Zhang C, Guo LY, Mu D, Gong JH, Chen J. Induction of apoptosis and erythroid differentiation of human chronic myelogenous leukemia K562 cells by low concentrations of lidamycin. Oncol Rep 2018; 41:475-482. [PMID: 30542729 DOI: 10.3892/or.2018.6849] [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] [Received: 04/25/2018] [Accepted: 10/30/2018] [Indexed: 11/06/2022] Open
Abstract
Apoptosis induction and differentiation of promyelocytic leukemic cells into mature cells are major strategies for the drug-based treatment of leukemia. Lidamycin (LDM) which is a member of the enediyne antibiotic family exhibits extreme cytotoxicity. In the present study, the induction of apoptosis and differentiation in human chronic myeloid leukemia K562 cells by low concentrations of lidamycin were investigated. K562 cells were treated with lidamycin at various concentrations for 48 h, and accumulated in the metaphase as determined in previous experiments. Cell viability was determined using a Cell Counting Kit-8 (CCK-8) assay and the IC50 value of lidamycin was 0.1±3.2 nM. Induction of apoptosis was investigated morphologically by acridine orange/ethidium bromide (AO/EtBr) staining. Growth inhibition and apoptosis induction were observed in cells treated with low concentrations of lidamycin. In addition, western blot analysis revealed that treatment of the K562 cells with lidamycin at low concentrations upregulated the expression of caspase-8 and caspase-3. The induction of differentiation in human chronic myeloid leukemia K562 cells by lidamycin at low concentrations was also investigated. The nitroblue tetrazolium reduction ability of K562 cells was increased following treatment with lidamycin. Low concentrations of lidamycin triggered erythroid differentiation among K562 cells, indicated by morphological changes, increased hemoglobin content, and the expression of cell surface antigens such as CD71. Additionally the expression of GATA-binding factor 1 (GATA-1) protein in low concentration lidamycin-treated K562 cells was increased. The results of the present study suggest that a low-concentration lidamycin exerts effects on apoptosis and erythroid differentiation induction by increasing the expression of caspases and GATA-1 protein. Lidamycin may serve a positive role in relevant targeted chemotherapy and may represent a potential candidate for chronic myelogenous leukemia differentiation-inducing treatment.
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Affiliation(s)
- Chu Zhang
- School of Pharmacy, China Pharmaceutical University, Nanjing, Jiangsu 210009, P.R. China
| | - Lu-Ying Guo
- College of Life Sciences, North China University of Science and Technology, Tangshan, Hebei 063210, P.R. China
| | - Dan Mu
- College of Life Sciences, North China University of Science and Technology, Tangshan, Hebei 063210, P.R. China
| | - Jian-Hua Gong
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 210009, P.R. China
| | - Jing Chen
- College of Life Sciences, North China University of Science and Technology, Tangshan, Hebei 063210, P.R. China
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Zhang H, Feng QQ, Gong JH, Ma JP. Anticancer effects of isofraxidin against A549 human lung cancer cells via the EGFR signaling pathway. Mol Med Rep 2018; 18:407-414. [PMID: 29750303 DOI: 10.3892/mmr.2018.8950] [Citation(s) in RCA: 7] [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] [Received: 08/13/2017] [Accepted: 03/15/2018] [Indexed: 11/05/2022] Open
Abstract
Lung cancer is the leading cause of mortality due to tumor malignancy worldwide. In recent years, the treatment of lung cancer with chemotherapy has demonstrated notable resistance and insensitivity. Therefore, it is of great importance to investigate anti‑lung cancer drugs with high efficiency and low toxicity. In the present study, the effects of isofraxidin on lung cancer cells and the associated mechanisms were investigated. The results revealed that, in vivo and in vitro, isofraxidin exhibited marked inhibitory effects on the A549 lung cancer cell line. The results of Cell Counting kit‑8, Transwell migration and Matrigel invasion assays, and flow cytometry to determine apoptosis, revealed that isofraxidin significantly inhibited the proliferation, migration and invasion of A549 cells, and induced the cell apoptosis. Furthermore, western blot analysis demonstrated that isofraxidin treatment led to effects on the expression of apoptosis‑associated proteins, including members of the Bcl‑2 protein family, and invasion‑associated proteins, including matrix metallopeptidase (MMP)‑2 and MMP‑9, which may occur via inhibition of the expression of phosphorylated (p)‑epidermal growth factor receptor, p‑AKT and p‑extracellular signal‑regulated kinase. This regulation of protein expression may contribute to the inhibition of proliferation, migration and invasion of A549lung cancer cells by isofraxidin. In addition, despite the inhibitory effects on the A549 lung cancer cell line, the present study revealed that isofraxidin exhibited low toxicity towards BEAS‑2B normal lung epithelial cells within a certain dose range (0‑160 µM), indicating that isofraxidin may be employed for lung cancer treatment with hypotoxicity and fewer side effects. In conclusion, isofraxidin may be a novel candidate for anti‑lung cancer chemotherapy.
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Affiliation(s)
- Han Zhang
- Breath Internal Medicine Department, The Second Clinical Medical College, Jingzhou Central Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology and Yangtze University, Jingzhou, Hubei 434100, P.R. China
| | - Qian-Qian Feng
- Breath Internal Medicine Department, The Second Clinical Medical College, Jingzhou Central Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology and Yangtze University, Jingzhou, Hubei 434100, P.R. China
| | - Jian-Hua Gong
- Breath Internal Medicine Department, The Second Clinical Medical College, Jingzhou Central Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology and Yangtze University, Jingzhou, Hubei 434100, P.R. China
| | - Jing-Ping Ma
- Breath Internal Medicine Department, The Second Clinical Medical College, Jingzhou Central Hospital Affiliated to Tongji Medical College of Huazhong University of Science and Technology and Yangtze University, Jingzhou, Hubei 434100, P.R. China
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Zheng YB, Gong JH, Liu XJ, Li Y, Zhen YS. A CD13-targeting peptide integrated protein inhibits human liver cancer growth by killing cancer stem cells and suppressing angiogenesis. Mol Carcinog 2017; 56:1395-1404. [PMID: 27991698 DOI: 10.1002/mc.22600] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [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: 07/08/2016] [Revised: 12/02/2016] [Accepted: 12/15/2016] [Indexed: 12/20/2022]
Abstract
CD13 is a marker of angiogenic endothelial cells, and recently it is proved to be a biomarker of human liver cancer stem cells (CSCs). Herein, the therapeutic effects of NGR-LDP-AE, a fusion protein composed of CD13-targeting peptide NGR and antitumor antibiotic lidamycin, on human liver cancer and its mechanism were studied. Western blot and immunofluorescence assay demonstrated that CD13 (WM15 epitope) was expressed in both human liver cancer cell lines and vascular endothelial cells, while absent in normal liver cells. MTT assay showed that NGR-LDP-AE displayed potent cytotoxicity to cultured tumor cell lines with IC50 values at low nanomolar level. NGR-LDP-AE inhibited tumorsphere formation of liver cancer cells, and the IC50 values were much lower than that in MTT assay, indicating selectively killing of CSCs. In endothelial tube formation assay, NGR-LDP-AE at low cytotoxic dose significantly inhibited the formation of intact tube networks. Animal experiment demonstrated that NGR-LDP-AE inhibited the growth of human liver cancer xenograft. Immunohistochemical analysis showed that NGR-LDP-AE induced the down-regulation of CD13. In vitro experiment using cultured tumor cells also confirmed this result. NGR-LDP-AE activated both apoptotic and autophagic pathways in cultured tumor cells, while the induced autophagy protected cells from death. Conclusively, NGR-LDP-AE exerts its antitumor activity via killing liver CSCs and inhibiting angiogenesis. With one targeting motif, NGR-LDP-AE acts on both liver CSCs and angiogenic endothelial cells. It is a promising dual targeting fusion protein for liver cancer therapy, especially for advanced or relapsed cancers.
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Affiliation(s)
- Yan-Bo Zheng
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Tiantan Xili, Beijing, China
| | - Jian-Hua Gong
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Tiantan Xili, Beijing, China
| | - Xiu-Jun Liu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Tiantan Xili, Beijing, China
| | - Yi Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Tiantan Xili, Beijing, China
| | - Yong-Su Zhen
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, 1 Tiantan Xili, Beijing, China
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Zheng YB, Gong JH, Liu XJ, Wu SY, Li Y, Xu XD, Shang BY, Zhou JM, Zhu ZL, Si SY, Zhen YS. A Novel Nitrobenzoate Microtubule Inhibitor that Overcomes Multidrug Resistance Exhibits Antitumor Activity. Sci Rep 2016; 6:31472. [PMID: 27510727 PMCID: PMC4980604 DOI: 10.1038/srep31472] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [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: 05/10/2016] [Accepted: 07/20/2016] [Indexed: 12/21/2022] Open
Abstract
Multidrug resistance is a major limitation for microtubule-binding agents in cancer treatment. Here we report a novel microtubule inhibitor (2-morpholin-4-yl-5-nitro-benzoic acid 4-methylsulfanyl-benzyl ester, IMB5046), its cytotoxicity against multidrug-resistant cell lines and its antitumor efficacy in animal models. IMB5046 disrupted microtubule structures in cells and inhibited purified tubulin polymerization in vitro. It bound to the colchicine pocket of tubulin. IMB5046 displayed potent cytotoxicity against multiple tumor cell lines with an IC50 range of 0.037–0.426 μM. Notably, several multidrug-resistant cell lines which were resistant to colchicine, vincristine and paclitaxel remained sensitive to IMB5046. IMB5046 was not a P-glycoprotein substrate. IMB5046 blocked cell cycle at G2/M phase and induced cell apoptosis. Microarray assay indicated that the differentially expressed genes after IMB5046 treatment were highly related to immune system, cell death and cancer. In a mouse xenograft model IMB5046 inhibited the growth of human lung tumor xenograft by 83% at a well-tolerated dose. It is concluded that IMB5046 is a tubulin polymerization inhibitor with novel chemical structure and can overcome multidrug resistance. It is a promising lead compound for cancer chemotherapy, especially for treatment of multidrug-resistant tumors.
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Affiliation(s)
- Yan-Bo Zheng
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Jian-Hua Gong
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Xiu-Jun Liu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Shu-Ying Wu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Yi Li
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Xian-Dong Xu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Bo-Yang Shang
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Jin-Ming Zhou
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Zhi-Ling Zhu
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Shu-Yi Si
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
| | - Yong-Su Zhen
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, P.R.China
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Xu Q, Gong JH, Yuan H, Qin YF, Liu JJ, Lu L, Gao D. [Effect of Rhubarb Combined Medicinal Activated Carbon on Levels of Serum Phosphorus, Calci- um-Phosphorus Product, and Parathyroid Hormone in Hemodialysis Patients with Hyperphosphatemia]. Zhongguo Zhong Xi Yi Jie He Za Zhi 2016; 36:797-800. [PMID: 30634204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Objective To study the effect of rhubarb combined medicinal activated carbon on levels of serum phosphorus and calcium-phosphorus product, as well as parathyroid hormone in hemodi- alysis patients with hyperphosphatemia. Methods Totally 126 hemodialysis patients with hyperphos- phatemia who had received treatment of calcium containing phosphorus binders were assigned to the treatment group and the control group according to random digit table, 63 in each group. Patients in the treatment group took rhubarb (80 mg/kg, twice per day, soaked in 150 mL boiled water, taken before dinner) combined with medicinal activated carbon (1. 5 g each time, thrice per day, taken during dinner). Those in the control group took medicinal activated carbon (1. 5 g each time, thrice per day, taken during dinner). The therapeutic course for all was 8 weeks. Levels of serum calcium , phosphorus, calcium- phosphorus product and parathyroid hormone were detected in the two groups before treatment, and at week 2, 4, 6, and 8 after treatment. Adverse reactions of gastrointestinal tract were observed as well. Results Twelve patients dropped out in the treatment group and the rest 51 completed the study. Nine patients dropped out in the treatment group and the rest 54 completed the study. Compared with before treatment in the same group, levels of serum phosphorus , calcium-phosphorus product, parathyroid hor- mone began to decline from week 2 to 8 in the treatment group (P <0. 05) ; and they began to decline from week 4 to 8 in the control group (P <0. 05). Compared with the control group, levels of serum phos- phorus, calcium-phosphorus product, parathyroid hormone obviously decreased in the treatment group (P <0.05). But there was no statistical difference in serum calcium level (P >0.05) between the two groups. Main adverse reactions of gastrointestinal tract mainly included abdominal distention, diarrhea, anal pedant expansion, and constipation. Compared with the control group, the incidence of abdominal distention and constipation, as well as the total incidence of gastrointestinal reactions all decreased in the treatment group (X2 =6. 815,7. 011 ,7.077, P <0. 05). Conclusion In addition to previous phosphorus binders therapy, rhubarb combined medicinal activated carbon could effectively reduce levels of serum phosphorus, calcium-phosphorus product, parathyroid hormone in hemodialysis patients with hyperphos- phatemia, and lessen complications of gastrointestinal tract.
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Wang J, Li L, Shao SS, He Z, Chen YL, Kong R, Zhang XH, Gong JH, Song RR. Association analysis of genetic variant of rs13331 in PSD95 gene with autism spectrum disorders: A case-control study in a Chinese population. ACTA ACUST UNITED AC 2016; 36:285-288. [PMID: 27072977 DOI: 10.1007/s11596-016-1581-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Revised: 10/27/2015] [Indexed: 11/26/2022]
Abstract
Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by high heritability. Recently, autism, the most profound form of ASD, has been increasingly attributed to synaptic abnormalities. Postsynaptic density 95 (PSD95), encoding PSD protein-95, was found essential for synaptic formation, maturation and plasticity at a PSD of excitatory synapse. It is possibly a crucial candidate gene for the pathogenesis of ASD. To identify the relationship between the rs13331 of PSD95 gene and ASD, we performed a case-control study in 212 patients and 636 controls in a Chinese population by using a polymerase chain reaction-restriction fragment length polymerase (PCR-RFLP) assay. The results showed that in genetic analysis of the heterozygous model, an association between the T allele of the rs13331 and ASD was found in the dominant model (OR=1.709, 95% CI 1.227-2.382, P=0.002) and the additive model (OR=1.409, 95% CI=1.104-1.800, P=0.006). Our data indicate that the genetic mutation C>T at the rs13331 in the PSD95 gene is strikingly associated with an increased risk of ASD.
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Affiliation(s)
- Jia Wang
- Department of Maternal and Child Health and MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Li Li
- Maternity and Children Health Care Hospital of Luohu District, Shenzhen, 518019, China
| | - Shan-Shan Shao
- Department of Maternal and Child Health and MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Zhen He
- Central Hospital of Longhua New District, Shenzhen, 518000, China
| | - Yan-Lin Chen
- Maternity and Children Health Care Hospital of Luohu District, Shenzhen, 518019, China
| | - Rui Kong
- Department of Maternal and Child Health and MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Xiao-Hui Zhang
- Department of Maternal and Child Health and MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Jian-Hua Gong
- Department of Maternal and Child Health and MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China.
- Maternity and Children Health Care Hospital of Luohu District, Shenzhen, 518019, China.
| | - Ran-Ran Song
- Department of Maternal and Child Health and MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
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Song MH, Zhu GJ, Ma L, Chen GL, Yang D, Gong JH, Xie YX, Yan Y, Wang MC. Comparative analysis of bilirubin in correlation to albumin between nephrotic syndrome patients and postoperative gastroparesis syndrome patients. Genet Mol Res 2014; 13:9403-11. [PMID: 24615116 DOI: 10.4238/2014.february.14.13] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This study aimed to disclose the potential causality of low bilirubin in patients with nephrotic syndrome (NS). Correlation analysis was carried out on total bilirubin (TBIL) to serum albumin (ALB), urine protein (Upr), and urinary microalbumin/creatinine (Umalb/cr) for three groups in a case-control study. P < 0.001 was observed for TBIL, ALB, Umalb/cr, and Upr between the NS and chronic nephritis (CN) groups, and P values of 0.0001, 1.000, 0.0001, and 0.0001 were observed for TBIL, ALB, Umalb/cr, and Upr, respectively, between the postoperative gastroparesis (PGS) and CN groups. The values of r and P in correlation to TBIL were 0.549 and 0.000 for ALB, -0.405 and 0.000 for Umalb/cr, and -0.448 and 0.000 for Upr in the NS group; -0.007 and 0.959 for ALB, 0.213 and 0.091 for Umalb/cr, and -0.082 and 0.519 for Upr in the PGS group; and 0.509 and 0.000 for ALB, -0.431 and 0.000 for Umalb/cr, and -0.362 and 0.002 for Upr in the CN group. A probable causality is implied between the low level of blood bilirubin and its loss in urine in NS patients. This conclusion may provide a theoretical basis for the feasibility of therapies against oxidative stress in NS patients.
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Affiliation(s)
- M H Song
- Integrated Chinese and Western Medicine Treatment of Renal Disease Centre, Beidaihe Sanatorium of Beijing Military Area Command, Chinese PLA, Qinhuangdao, China
| | - G J Zhu
- Integrated Chinese and Western Medicine Treatment of Renal Disease Centre, Beidaihe Sanatorium of Beijing Military Area Command, Chinese PLA, Qinhuangdao, China
| | - L Ma
- Integrated Chinese and Western Medicine Treatment of Renal Disease Centre, Beidaihe Sanatorium of Beijing Military Area Command, Chinese PLA, Qinhuangdao, China
| | - G L Chen
- Integrated Chinese and Western Medicine Treatment of Renal Disease Centre, Beidaihe Sanatorium of Beijing Military Area Command, Chinese PLA, Qinhuangdao, China
| | - D Yang
- Integrated Chinese and Western Medicine Treatment of Renal Disease Centre, Beidaihe Sanatorium of Beijing Military Area Command, Chinese PLA, Qinhuangdao, China
| | - J H Gong
- Integrated Chinese and Western Medicine Treatment of Renal Disease Centre, Beidaihe Sanatorium of Beijing Military Area Command, Chinese PLA, Qinhuangdao, China
| | - Y X Xie
- Integrated Chinese and Western Medicine Treatment of Renal Disease Centre, Beidaihe Sanatorium of Beijing Military Area Command, Chinese PLA, Qinhuangdao, China
| | - Y Yan
- Integrated Chinese and Western Medicine Treatment of Renal Disease Centre, Beidaihe Sanatorium of Beijing Military Area Command, Chinese PLA, Qinhuangdao, China
| | - M C Wang
- Integrated Chinese and Western Medicine Treatment of Renal Disease Centre, Beidaihe Sanatorium of Beijing Military Area Command, Chinese PLA, Qinhuangdao, China
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Zheng YB, Gong JH, Li Y, Zhen YS. [Inhibition of tumor cell invasion and induction of apoptosis by ubenimex]. Yao Xue Xue Bao 2012; 47:1593-1598. [PMID: 23460963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
This study is to investigate the effects of ubenimex on tumor cell invasion and apoptosis, dose relationship and mechanism. Immunofluorescence staining was performed to detect the expression of CD13 in HT-1080 cells. MTT assay was used to analyze the effect of ubenimex on cell proliferation. Annexin V-EGFP/PI was used to detect apoptotic cells by flow cytometry. Cell cycle was analyzed using flow cytometry. Ala-pNA was used as substrate to evaluate the effect of ubenimex on the aminopeptidase activity. Transwell assay was used to analyze the effect of ubenimex on cell invasion and migration ability. Western blotting was used to detect the expression level of CD13. MMP activity was analyzed using gelatin zymography. The results showed that ubenimex at high concentration inhibited the proliferation of HT-1080 cells (IC50: 3.8 mg x mL(-1)), and induced cell apoptosis. Cell cycle was blocked at G1 phase. Ubenimex at low concentration inhibited the aminopeptidase activity of HT-1080 cells (IC50: 8.3 microg x mL(-1)) and inhibited cell invasion, but it had no effects on the cell migration and proliferation. Ubenimex had no effects on CD13 expression and MMP activity. In conclusion, ubenimex at low concentration can inhibit the invasion ability of tumor cells by directly inhibiting the aminopeptidase activity; ubenimex at high concentration can inhibit the proliferation of tumor cells and induce cell apoptosis by a CD13-independent pathway.
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Affiliation(s)
- Yan-Bo Zheng
- Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050, China
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Hu B, Gong J, Sun J, Zhou J. Exploring the epidemic transmission network of SARS in-out flow in mainland China. Chin Sci Bull 2012; 58:1818-1831. [PMID: 32214741 PMCID: PMC7089103 DOI: 10.1007/s11434-012-5501-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2012] [Accepted: 09/04/2012] [Indexed: 11/25/2022]
Abstract
The changing spatiotemporal patterns of the individual susceptible-infected-symptomatic-treated-recovered epidemic process and the interactions of information/material flows between regions, along with the 2002-2003 Severe Acute Respiratory Syndrome (SARS) epidemiological investigation data in mainland China, including three typical locations of individuals (working unit/home address, onset location and reporting unit), are used to define the in-out flow of the SARS epidemic spread. Moreover, the input/output transmission networks of the SARS epidemic are built according to the definition of in-out flow. The spatiotemporal distribution of the SARS in-out flow, spatial distribution and temporal change of node characteristic parameters, and the structural characteristics of the SARS transmission networks are comprehensively and systematically explored. The results show that (1) Beijing and Guangdong had the highest risk of self-spread and output cases, and prevention/control measures directed toward self-spread cases in Beijing should have focused on the later period of the SARS epidemic; (2) the SARS transmission networks in mainland China had significant clustering characteristics, with two clustering areas of output cases centered in Beijing and Guangdong; (3) Guangdong was the original source of the SARS epidemic, and while the infected cases of most other provinces occurred mainly during the early period, there was no significant spread to the surrounding provinces; in contrast, although the input/output interactions between Beijing and the other provinces countrywide began during the mid-late epidemic period, SARS in Beijing showed a significant capacity for spatial spreading; (4) Guangdong had a significant range of spatial spreading throughout the entire epidemic period, while Beijing and its surrounding provinces formed a separate, significant range of high-risk spreading during the mid-late period; especially in late period, the influence range of Beijing's neighboring provinces, such as Hebei, was even slightly larger than that of Beijing; and (5) the input network had a low-intensity spread capacity and middle-level influence range, while the output network had an extensive high-intensity spread capacity and influence range that covered almost the entire country, and this spread and influence indicated that significant clustering characteristics increased gradually. This analysis of the epidemic in-out flow and its corresponding transmission network helps reveal the potential spatiotemporal characteristics and evolvement mechanism of the SARS epidemic and provides more effective theoretical support for prevention and control measures.
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Affiliation(s)
- BiSong Hu
- Geography and Environment Department, Jiangxi Normal University, Nanchang, 330022 China
- Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Jiangxi Normal University, Nanchang, 330022 China
| | - JianHua Gong
- State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing, 100101 China
- Zhejiang-CAS Application Center for Geoinformatics, Jiaxing, 314100 China
| | - Jun Sun
- State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing, 100101 China
| | - JiePing Zhou
- State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing, 100101 China
- Zhejiang-CAS Application Center for Geoinformatics, Jiaxing, 314100 China
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Hu B, Gong J, Zhou J, Sun J, Yang L, Xia Y, Ibrahim AN. Spatial-temporal characteristics of epidemic spread in-out flow-Using SARS epidemic in Beijing as a case study. Sci China Earth Sci 2012; 56:1380-1397. [PMID: 32288762 PMCID: PMC7104600 DOI: 10.1007/s11430-012-4479-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Accepted: 08/27/2012] [Indexed: 05/19/2023]
Abstract
For better detecting the spatial-temporal change mode of individual susceptible-infected-symptomatic-treated-recovered epidemic progress and the characteristics of information/material flow in the epidemic spread network between regions, the epidemic spread mechanism of virus input and output was explored based on individuals and spatial regions. Three typical spatial information parameters including working unit/address, onset location and reporting unit were selected and SARS epidemic spread in-out flow in Beijing was defined based on the SARS epidemiological investigation data in China from 2002 to 2003 while its epidemiological characteristics were discussed. Furthermore, by the methods of spatial-temporal statistical analysis and network characteristic analysis, spatial-temporal high-risk hotspots and network structure characteristics of Beijing outer in-out flow were explored, and spatial autocorrelation/heterogeneity, spatial-temporal evolutive rules and structure characteristics of the spread network of Beijing inner in-out flow were comprehensively analyzed. The results show that (1) The outer input flow of SARS epidemic in Beijing concentrated on Shanxi and Guangdong provinces, but the outer output flow was disperse and mainly includes several north provinces such as Guangdong and Shandong. And the control measurement should focus on the early and interim progress of SARS breakout. (2) The inner output cases had significant positive autocorrelative characteristics in the whole studied region, and the high-risk population was young and middle-aged people with ages from 20 to 60 and occupations of medicine and civilian labourer. (3) The downtown districts were main high-risk hotspots of SARS epidemic in Beijing, the northwest suburban districts/counties were secondary high-risk hotspots, and northeast suburban areas were relatively safe. (4) The district/county nodes in inner spread network showed small-world characteristics and information/material flow had notable heterogeneity. The suburban Tongzhou and Changping districts were the underlying high-risk regions, and several suburban districts such as Shunyi and Huairou were the relatively low-risk safe regions as they carried out minority information/material flow. The exploration and analysis based on epidemic spread in-out flow help better detect and discover the potential spatial-temporal evolutive rules and characteristics of SARS epidemic, and provide a more effective theoretical basis for emergency/control measurements and decision-making.
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Affiliation(s)
- BiSong Hu
- Geography and Environment Department, Jiangxi Normal University/Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Nanchang, 330022 China
- Institute of Remote Sensing Applications, Chinese Academy of Sciences/State Key Laboratory of Remote Sensing Science, Beijing, 100101 China
| | - JianHua Gong
- Institute of Remote Sensing Applications, Chinese Academy of Sciences/State Key Laboratory of Remote Sensing Science, Beijing, 100101 China
- Zhejiang-CAS Application Center for Geoinformatics, Jiaxing, 314100 China
| | - JiePing Zhou
- Institute of Remote Sensing Applications, Chinese Academy of Sciences/State Key Laboratory of Remote Sensing Science, Beijing, 100101 China
- Zhejiang-CAS Application Center for Geoinformatics, Jiaxing, 314100 China
| | - Jun Sun
- Institute of Remote Sensing Applications, Chinese Academy of Sciences/State Key Laboratory of Remote Sensing Science, Beijing, 100101 China
| | - LiYang Yang
- Institute of Remote Sensing Applications, Chinese Academy of Sciences/State Key Laboratory of Remote Sensing Science, Beijing, 100101 China
| | - Yu Xia
- Geography and Environment Department, Jiangxi Normal University/Key Laboratory of Poyang Lake Wetland and Watershed Research, Ministry of Education, Nanchang, 330022 China
| | - Abdoul Nasser Ibrahim
- Institute of Remote Sensing Applications, Chinese Academy of Sciences/State Key Laboratory of Remote Sensing Science, Beijing, 100101 China
- Zhejiang-CAS Application Center for Geoinformatics, Jiaxing, 314100 China
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20
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Abstract
Potassium channels are essential for the regulation of cell proliferation. As reported, HERG protein is overexpressed in a wide range of human tumors, including colon carcinoma. The aim of this study was to investigate the effects of antibacterial agents sparfloxacin (SPFX), a blocker of HERG channel, on HERG K+ channel highly expressing colon cancer cells. Expression of HERG and apoptosis correlative proteins was examined by Western blotting. The MTT assay was used to detect the cytotoxicity of drugs and drug combination in vitro. Gene transfection was used to examine the changes in herg-related chemosensitivity. Cell apoptosis was analyzed by flow cytometry. The migration and invasion capacity of tumor cells by SPFX was determined by gelatin zymography assay and Boyden chamber. The in vivo efficacy of SPFX was assessed in murine colon carcinoma C26 in BALB/c mice and human colon carcinoma HCT116 xenografts in nude mice. High expression of HERG protein was detected in colon cancer C26, HCT116 and HT-29 cells. The cell viability of the colon cancer cells was inhibited by SPFX in a dose-dependent manner. SPFX induced apoptosis and inhibited migration and invasion of colon cancer HCT116 cells. The increase in apoptosis was associated with a decrease in procaspase-3 and Bcl-2 protein expression. Study with herg-transfected HEK293 cells and siRNA-knock down HCT116 cells confirmed that the cell viability inhibition by SPFX was correlated with HERG expression. When combined with 5-fluorouracil, SPFX showed synergistic anti-proliferation activity in HCT116 and HT-29 cells. Furthermore, SPFX inhibited the growth of human colon carcinoma HCT116 xenografts and showed synergistic effect with 5-fluorouracil in vivo. Our finding suggested that SPFX could be a biochemical modulator in treatment of colon cancer with chemotherapeutic drugs.
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Affiliation(s)
- Jian-Hua Gong
- Department of Oncology, Institute of Medicinal Biotechnology, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, PR China
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Huang MX, Wang K, Shi Z, Gong JH, Li HY, Chen JL. [Quantitative evaluation of soil hyperspectra denoising with different filters]. Guang Pu Xue Yu Guang Pu Fen Xi 2009; 29:722-725. [PMID: 19455808] [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: 05/27/2023]
Abstract
The noise distribution of soil hyperspectra measured by ASD FieldSpec Pro FR was described, and then the quantitative evaluation of spectral denoising with six filters was compared. From the interpretation of soil hyperspectra, the continuum removed, first-order differential and high frequency curves, the UV/VNIR (350-1 050 nm) exhibit hardly noise except the coverage of 40 nm in the beginning 350 nm. However, the SWIR (1 000-2 500 nm) shows different noise distribution. Especially, the latter half of SWIR 2(1 800-2 500 nm) showed more noise, and the intersection spectrum of three spectrometers has more noise than the neighbor spectrum. Six filters were chosen for spectral denoising. The smoothing indexes (SI), horizontal feature reservation index (HFRI) and vertical feature reservation index (VFRI) were designed for evaluating the denoising performance of these filters. The comparison of their indexes shows that WD and MA filters are the optimal choice to filter the noise, in terms of balancing the contradiction between the smoothing and feature reservation ability. Furthermore the first-order differential data of 66 denoising soil spectra by 6 filters were respectively used as the input of the same PLSR model to predict the sand content. The different prediction accuracies caused by the different filters show that compared to the feature reservation ability, the filter's smoothing ability is the principal factor to influence the accuracy. The study can benefit the spectral preprocessing and analyzing, and also provide the scientific foundation for the related spectroscopy applications.
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Affiliation(s)
- Ming-Xiang Huang
- Institute of Agricultural Remote Sensing and Information System, College of Environmental and Resources Science, Zhejiang University, Hangzhou 310029, China.
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Guo XW, Wang GL, Gong JH. [Culture conditions and analysis of amanitins on Amanita spissa]. Wei Sheng Wu Xue Bao 2006; 46:373-8. [PMID: 16933604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Isolate of Amanita spissa was obtained from basidiome stipe material collected from environment. It could utilize a broad range of carbon and nitrogen resources. Study on the influence of different conditions for solid culture was carried out. Optimal culture conditions were at 28 degrees C, pH6, in the dark. A. spissa was then fermentated in liquid culture for more mycelia. In flask and Airlift/ff bioreactor, maximum dry mycelia weight of A. spissa reached 0.893 g/L and 2.33 g/L, respectively. Mycelia obtained from solid culture and Airlift/ff bioreactor were then analyzed by HPLC. The results showed that mycelia from both cultures contained amatoxins but no phallotoxins. alpha-Amanitin in mycelia reached 26.02 microg/DWg under solid culture condition, and 15.25 microg/DWg under liquid culture condition. The amanitins were also confirmed by bud-inhibited assay. The results revealed that the effect of amanitin on mung bean cell was identical to that of authentic amanitins. This work suggests that it is possible to produce amatoxin by liquid culturing of A. spissa.
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Affiliation(s)
- Xue-Wu Guo
- Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, China.
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23
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Yang C, Jiang Y, Huang K, Zhu C, Yin Y, Gong JH, Yu H. A real-time PCR assay for the detection and quantitation of Campylobacter jejuni using SYBR Green I and the LightCycler. Yale J Biol Med 2004; 77:125-32. [PMID: 15989741 PMCID: PMC2259121] [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] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Campylobacter jejuni is recognized as a leading human food-borne pathogen. Traditional biochemical identification for C. jejuni is not reliable due to special growth requirements and the possibility that this bacterium can enter a viable but nonculturable (VNC) state. Nucleic acid-based tests have emerged as a useful alternative to traditional testing. In this article, we present fluorescent quantitative PCR assay for quantitative detection of C. jejuni, the assay was carried out using a LightCycler instrument and product formation was monitored continuously with the fluorescent double-stranded DNA binding dye SYBR Green I. When this assay was applied, the assay positive for all of the isolates of C. jejuni tested (11 isolates, including type strain ATCC33560) and negative for all other Campylobacter spp. (three isolates) and several other bacteria (five species tested). The total assay could be completed in 60 min with a detection limit of approximately 1 CFU, and a correlation coefficient was 1.000. Result indicated that fluorescent quantitative detection methods provided a special, sensitive, rapid, reproducible and accurate method for quantitative detection of C. jejuni.
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Affiliation(s)
- Chengbo Yang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, PR China
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24
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McQuibban GA, Butler GS, Gong JH, Bendall L, Power C, Clark-Lewis I, Overall CM. Matrix metalloproteinase activity inactivates the CXC chemokine stromal cell-derived factor-1. J Biol Chem 2001; 276:43503-8. [PMID: 11571304 DOI: 10.1074/jbc.m107736200] [Citation(s) in RCA: 513] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Chemokines provide directional cues for leukocyte migration and activation that are essential for normal leukocytic trafficking and for host responses during processes such as inflammation, infection, and cancer. Recently we reported that matrix metalloproteinases (MMPs) modulate the activity of the CC chemokine monocyte chemoattractant protein-3 by selective proteolysis to release the N-terminal tetrapeptide. Here we report the N-terminal processing, also at position 4-5, of the CXC chemokines stromal cell-derived factor (SDF)-1alpha and beta by MMP-2 (gelatinase A). Robustness of the MMP family for chemokine cleavage was revealed from identical cleavage site specificity of MMPs 1, 3, 9, 13, and 14 (MT1-MMP) toward SDF-1; selectivity was indicated by absence of cleavage by MMPs 7 and 8. Efficient cleavage of SDF-1alpha by MMP-2 is the result of a strong interaction with the MMP hemopexin C domain at an exosite that overlaps the monocyte chemoattractant protein-3 binding site. The association of SDF-1alpha with different glycosaminoglycans did not inhibit cleavage. MMP cleavage of SDF-1alpha resulted in loss of binding to its cognate receptor CXCR-4. This was reflected in a loss of chemoattractant activity for CD34(+) hematopoietic progenitor stem cells and pre-B cells, and unlike full-length SDF-1alpha, the MMP-cleaved chemokine was unable to block CXCR-4-dependent human immunodeficiency virus-1 infection of CD4(+) cells. These data suggest that MMPs may be important regulatory proteases in attenuating SDF-1 function and point to a deep convergence of two important networks, chemokines and MMPs, to regulate leukocytic activity in vivo.
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Affiliation(s)
- G A McQuibban
- Department of Biochemistry and Molecular Biology, Oral Biological and Medical Sciences, Biomedical Research Centre, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
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Wei F, Cheng F, Gong JH, Tang ST. [High performance liquid chromatographic determination of domoic acid in shellfish samples]. Se Pu 2001; 19:248-50. [PMID: 12541809] [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: 02/28/2023] Open
Abstract
Domoic acid in shellfish samples was determined by HPLC with DAD/UV detector at 242 nm. Samples were extracted with methanol-water followed by clean-up of the extracts with strong anion exchange solid phase extraction cartridge(3 mL LC-SAX). Zorbax SB-C18 column, 150 mm x 4.6 mm i.d., and mobile phase of acetonitrile-0.1% aqueous trifluoroacetic acid(13:87, V/V) were used for the assay. The quantitative analysis was performed with external standard. The calibration curve of domoic acid was linear in the range of 1.0 m/L-25.0 mg/L and the detection limit was ca. 0.2 microgram/g.
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Affiliation(s)
- F Wei
- Liaoning Entry-Exit Inspection and Quarantine Bureau of China, Dalian 116001, China
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26
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Loetscher P, Pellegrino A, Gong JH, Mattioli I, Loetscher M, Bardi G, Baggiolini M, Clark-Lewis I. The ligands of CXC chemokine receptor 3, I-TAC, Mig, and IP10, are natural antagonists for CCR3. J Biol Chem 2001; 276:2986-91. [PMID: 11110785 DOI: 10.1074/jbc.m005652200] [Citation(s) in RCA: 227] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Th1 and Th2 lymphocytes express a different repertoire of chemokine receptors (CCRs). CXCR3, the receptor for I-TAC (interferon-inducible T cell alpha-chemoattractant), Mig (monokine induced by gamma-interferon), and IP10 (interferon-inducible protein 10), is expressed preferentially on Th1 cells, whereas CCR3, the receptor for eotaxin and several other CC chemokines, is characteristic of Th2 cells. While studying responses that are mediated by these two receptors, we found that the agonists for CXCR3 act as antagonists for CCR3. I-TAC, Mig, and IP10 compete for the binding of eotaxin to CCR3-bearing cells and inhibit migration and Ca(2+) changes induced in such cells by stimulation with eotaxin, eotaxin-2, MCP-2 (monocyte chemottractant protein-2), MCP-3, MCP-4, and RANTES (regulated on activation normal T cell expressed and secreted). A hybrid chemokine generated by substituting the first eight NH(2)-terminal residues of eotaxin with those of I-TAC bound CCR3 with higher affinity than eotaxin or I-TAC (3- and 10-fold, respectively). The hybrid was 5-fold more potent than I-TAC as an inhibitor of eotaxin activity and was effective at concentrations as low as 5 nm. None of the antagonists described induced the internalization of CCR3, indicating that they lack agonistic effects and thus qualify as pure antagonists. These results suggest that chemokines that attract Th1 cells via CXCR3 can concomitantly block the migration of Th2 cells in response to CCR3 ligands, thus enhancing the polarization of T cell recruitment.
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Affiliation(s)
- P Loetscher
- Theodor-Kocher Institute, University of Bern, P. O. Box 99, CH-3000 Bern 9, Switzerland.
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27
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McQuibban GA, Gong JH, Tam EM, McCulloch CA, Clark-Lewis I, Overall CM. Inflammation dampened by gelatinase A cleavage of monocyte chemoattractant protein-3. Crit Rev Biochem Mol Biol 2000; 48:222-72. [PMID: 10947989 DOI: 10.3109/10409238.2013.770819] [Citation(s) in RCA: 536] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Tissue degradation by the matrix metalloproteinase gelatinase A is pivotal to inflammation and metastases. Recognizing the catalytic importance of substrate-binding exosites outside the catalytic domain, we screened for extracellular substrates using the gelatinase A hemopexin domain as bait in the yeast two-hybrid system. Monocyte chemoattractant protein-3 (MCP-3) was identified as a physiological substrate of gelatinase A. Cleaved MCP-3 binds to CC-chemokine receptors-1, -2, and -3, but no longer induces calcium fluxes or promotes chemotaxis, and instead acts as a general chemokine antagonist that dampens inflammation. This suggests that matrix metalloproteinases are both effectors and regulators of the inflammatory response.
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Affiliation(s)
- G A McQuibban
- Department of Biochemistry and Molecular Biology, Biomedical Research Centre, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
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28
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Abstract
Tissue degradation by the matrix metalloproteinase gelatinase A is pivotal to inflammation and metastases. Recognizing the catalytic importance of substrate-binding exosites outside the catalytic domain, we screened for extracellular substrates using the gelatinase A hemopexin domain as bait in the yeast two-hybrid system. Monocyte chemoattractant protein-3 (MCP-3) was identified as a physiological substrate of gelatinase A. Cleaved MCP-3 binds to CC-chemokine receptors-1, -2, and -3, but no longer induces calcium fluxes or promotes chemotaxis, and instead acts as a general chemokine antagonist that dampens inflammation. This suggests that matrix metalloproteinases are both effectors and regulators of the inflammatory response.
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Affiliation(s)
- G A McQuibban
- Department of Biochemistry and Molecular Biology, Biomedical Research Centre, University of British Columbia, Vancouver, BC V6T 1Z3, Canada
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29
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Loetscher P, Gong JH, Dewald B, Baggiolini M, Clark-Lewis I. N-terminal peptides of stromal cell-derived factor-1 with CXC chemokine receptor 4 agonist and antagonist activities. J Biol Chem 1998; 273:22279-83. [PMID: 9712844 DOI: 10.1074/jbc.273.35.22279] [Citation(s) in RCA: 116] [Impact Index Per Article: 4.5] [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
Peptides corresponding to the N-terminal 9 residues of stromal cell-derived factor-1 (SDF-1) have SDF-1 activity. SDF-1, 1-8, 1-9, 1-9 dimer, and 1-17 induced intracellular calcium and chemotaxis in T lymphocytes and CEM cells and bound to CXC chemokine receptor 4 (CXCR4). The peptides had similar activities to SDF-1 but were less potent. Whereas native SDF-1 had half-maximal chemoattractant activity at 5 nM, the 1-9 dimer required 500 nM and was therefore 100-fold less potent. The 1-17 and a 1-9 monomer analog were 4- and 36-fold, respectively, less potent than the 1-9 dimer. Both the chemotactic and calcium response of the 1-9 dimer was inhibited by an antibody to CXCR4. The basis for the enhanced activity of the dimer form of SDF-1, 1-9 is uncertain, but it could involve an additional fortuitous binding site on the 1-9 peptide in addition to the normal SDF-1, 1-9 site. A 1-9 analog, 1-9[P2G] dimer, was found to be a CXCR4 antagonist. Overall this study shows that the N-terminal peptides are CXCR4 agonists or antagonists, and these could be leads for high affinity ligands.
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Affiliation(s)
- P Loetscher
- Theodor-Kocher Institute, University of Bern, CH 3000 Bern, Switzerland
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30
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Crump MP, Gong JH, Loetscher P, Rajarathnam K, Amara A, Arenzana-Seisdedos F, Virelizier JL, Baggiolini M, Sykes BD, Clark-Lewis I. Solution structure and basis for functional activity of stromal cell-derived factor-1; dissociation of CXCR4 activation from binding and inhibition of HIV-1. EMBO J 1997; 16:6996-7007. [PMID: 9384579 PMCID: PMC1170303 DOI: 10.1093/emboj/16.23.6996] [Citation(s) in RCA: 597] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The three-dimensional structure of stromal cell-derived factor-1 (SDF-1) was determined by NMR spectroscopy. SDF-1 is a monomer with a disordered N-terminal region (residues 1-8), and differs from other chemokines in the packing of the hydrophobic core and surface charge distribution. Results with analogs showed that the N-terminal eight residues formed an important receptor binding site; however, only Lys-1 and Pro-2 were directly involved in receptor activation. Modification to Lys-1 and/or Pro-2 resulted in loss of activity, but generated potent SDF-1 antagonists. Residues 12-17 of the loop region, which we term the RFFESH motif, unlike the N-terminal region, were well defined in the SDF-1 structure. The RFFESH formed a receptor binding site, which we propose to be an important initial docking site of SDF-1 with its receptor. The ability of the SDF-1 analogs to block HIV-1 entry via CXCR4, which is a HIV-1 coreceptor for the virus in addition to being the receptor for SDF-1, correlated with their affinity for CXCR4. Activation of the receptor is not required for HIV-1 inhibition.
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Affiliation(s)
- M P Crump
- Protein Engineering Network of Centers of Excellence (PENCE) and Department of Biochemistry, 713 Heritage Medical Research Center, University of Alberta, Edmonton, Alberta, Canada T6G 2S2
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31
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Gong JH, Ratkay LG, Waterfield JD, Clark-Lewis I. An antagonist of monocyte chemoattractant protein 1 (MCP-1) inhibits arthritis in the MRL-lpr mouse model. J Exp Med 1997; 186:131-7. [PMID: 9207007 PMCID: PMC2198969 DOI: 10.1084/jem.186.1.131] [Citation(s) in RCA: 322] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/1996] [Revised: 04/02/1997] [Indexed: 02/04/2023] Open
Abstract
An antagonist of human monocyte chemoattractant protein (MCP)-1, which consists of MCP-1(9-76), had previously been characterized and shown to inhibit MCP-1 activity in vitro. To test the hypothesis that, by inhibiting endogenous MCP-1, the antagonist has antiinflammatory activity in vivo, we examined its effect in the MRL-lpr mouse model of arthritis. This strain spontaneously develops a chronic inflammatory arthritis that is similar to human rheumatoid arthritis. Daily injection of the antagonist, MCP-1(9-76), prevented the onset of arthritis as monitored by measuring joint swelling and by histopathological evaluation of the joints. In contrast, controls treated with native MCP-1 had enhanced arthritis symptoms, indicating that the inhibitory effect is specific to the antagonist. In experiments where the antagonist was given only after the disease had already developed, there was a marked reduction in symptoms and histopathology, although individuals varied in the magnitude of the response. The mechanism of inhibition of disease is not known, although the results suggest that it could be more complex than the competitive inhibition of ligand binding that is observed in vitro. The demonstration of the beneficial effects of an MCP-1 antagonist in arthritis suggests that chemokine receptor antagonists could have therapeutic application in inflammatory diseases.
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Affiliation(s)
- J H Gong
- Biomedical Research Centre and Department of Biochemistry and Molecular Biology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
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32
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Mehra V, Gong JH, Iyer D, Lin Y, Boylen CT, Bloom BR, Barnes PF. Immune response to recombinant mycobacterial proteins in patients with tuberculosis infection and disease. J Infect Dis 1996; 174:431-4. [PMID: 8699083 DOI: 10.1093/infdis/174.2.431] [Citation(s) in RCA: 38] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The capacity of four Mycobacterium tuberculosis recombinant antigens to elicit proliferation and cytokine production by human T cells was evaluated. Proliferative responses of peripheral blood mononuclear cells (PBMC) to all antigens were greater in healthy tuberculin reactors than in pulmonary tuberculosis patients, and proliferative responses of pleural fluid cells were greater than those of PBMC from patients with tuberculous pleuritis. The proliferative responses to the four recombinant antigens were similar in all patient groups, and there was no selective unresponsiveness to any antigen in pulmonary tuberculosis patients. The 38-kDa antigen induced less interferon-gamma than did the 10-, 30-, and 65-kDa antigens, and all four antigens induced similar amounts of interleukin-10. These results suggest that none of the four recombinant antigens are immunodominant, and that the 10-, 30-, and 65-kDa antigens are similar in their capacity to induce a potentially protective Th1-like response.
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Affiliation(s)
- V Mehra
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, New York, New York, USA
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33
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Abstract
Antagonists of multiple chemokines could be more effective than inhibitors of specific chemokines for controlling cell migration and inflammation. To attempt to identify such antagonists we characterized a number of truncated analogs of regulated on activation normal T cell expressed protein (RANTES), monocyte chemoattractant protein (MCP)-3, and MCP-1. On the basis of their ability to compete for binding of their parent chemokines, three analogs were selected for cross-reactivity studies: RANTES (9-68), MCP-3 (10-76), and MCP-1 (9-76). These analogs bound to THP-1 monocytic cells with dissociation constants that were within 4-6-fold of their native counterparts, but they did not promote detectable chemotaxis of THP-1 cells or enzyme release from purified human monocytes. The RANTES (9-68) analog competed for the binding and inhibited the activities of all three chemokines. In contrast, native RANTES was specific for RANTES binding sites. However, truncation of either MCP-1 or MCP-3 did not change their respective binding specificity. MCP-3 and MCP-3 (10-76) competed for binding of all three labeled chemokines. MCP-1 (9-76) competed strongly for binding of labeled MCP-1, but only weakly for the other two labeled ligands and inhibited the activities induced by MCP-1 and MCP-3 but not RANTES. Although RANTES (9-68) and MCP-3 (10-76) inhibited all three chemokines, the RANTES analog was significantly more potent for RANTES-induced activity. The results indicate that NH2-terminal residues partly determine the receptor specificity of RANTES, and deletions within this region permit binding to multiple chemokine receptors. The findings suggest the feasibility of design of high affinity multi-specific CC chemokine antagonists.
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Affiliation(s)
- J H Gong
- Biomedical Research Centre, University of British Columbia, Vancouver, Canada
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34
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Gong JH, Zhang M, Modlin RL, Linsley PS, Iyer D, Lin Y, Barnes PF. Interleukin-10 downregulates Mycobacterium tuberculosis-induced Th1 responses and CTLA-4 expression. Infect Immun 1996; 64:913-8. [PMID: 8641800 PMCID: PMC173856 DOI: 10.1128/iai.64.3.913-918.1996] [Citation(s) in RCA: 155] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
To characterize the mechanism by which interleukin 10 (IL-10) inhibits Th1 responses to intracellular pathogens, we evaluated the interaction between IL-10 and Mycobacterium tuberculosis-induced gamma interferon (IFN-gamma) production by peripheral blood mononuclear cells from persons across the spectrum of tuberculous infection. M. tuberculosis-induced IFN-gamma production was highest in healthy tuberculin reactors, intermediate in human immunodeficiency virus (HIV)-negative tuberculosis patients, and lowest in HIV-infected tuberculosis patients. Neutralizing antibodies to IL-10 increased IFN-gamma production in HIV-infected and HIV-negative tuberculosis patients by enhancing monocyte IL-12 production. Expression of the T-cell-costimulatory molecule CTLA-4 was depressed in M. tuberculosis-stimulated peripheral blood mononuclear cells from tuberculosis patients, and anti-IL-10 and Il-12 upregulated expression of CTLA-4. These findings provide evidence that intracellular pathogens can inhibit Th1 responses and downregulate expression of specific costimulatory molecules.
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Affiliation(s)
- J H Gong
- Department of Medicine, University of Southern California School of Medicine, Los Angeles, 90033, USA
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35
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Abstract
Structural analysis of chemokines has revealed that the alpha/beta structural-fold is highly conserved among both the CXC and CC chemokine classes. Although dimerization and aggregation is often observed, the chemokines function as monomers. The critical receptor binding regions are in the NH2-terminal 20 residues of the protein and are the least ordered in solution. The flexible NH2-terminal region is the most critical receptor binding site and a second site also exists in the loop that follows the two disulfides. The well-ordered regions are not directly involved in receptor binding but, along with the disulfides, they provide a scaffold that determines the conformation of the sites that are critical for receptor binding. These general requirements for function are common to all the chemokines. For the CC chemokines, receptor activation and receptor binding regions are separate within the 10 residue NH2-terminal region. This has allowed identification of high affinity analogs that do not activate the receptor and are potent antagonists.
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Affiliation(s)
- I Clark-Lewis
- Biomedical Research Centre, University of British Columbia, Vancouver, Canada
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36
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Abstract
Monocyte chemoattractant protein (MCP)-1 analogues were designed to determine the role of the NH2-terminal region in structure and function. The NH2-terminal residue was important for function and receptor binding, as it could not be deleted or extended. However the NH2-terminal pyroglutamate residue of the wild type was not essential as it could be replaced by several other noncyclic amino acids without loss of activity. Residues 7-10 were essential for receptor desensitization, but were not sufficient for function, and the integrity of residues 1-6 were required for functional activity. A peptide corresponding to MCP-1, 1-10 lacked detectable receptor-binding activities, indicating that residues 1-10 are essential for MCP-1 function, but that other residues are also involved. Several truncated analogues, including 8-76, 9-76, and 10-76, desensitized MCP-1-induced Ca2+ induction, but were not significantly active. These analogues were antagonists of MCP-1 activity with the most potent being the 9-76 analogue (IC50 = 20 nM) The 9-76 specifically bound to MCP-1 receptors with a Kd of 8.3 nM, which was three-fold higher than MCP-1 (Kd 2.8 nM). The 9-76 analogue desensitized the Ca2+ response to MCP-1 and MCP-3, but not to other CC chemokines, suggesting that it is MCP receptor specific. The availability of these compounds will be helpful in evaluating MCP receptor antagonists as anti-inflammatory therapeutics.
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Affiliation(s)
- J H Gong
- Biomedical Research Centre, University of British Columbia, Vancouver, Canada
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37
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Wang L, Jiang W, Gong JH, Zheng XY. Saturation diving with heliox to 350 meters. Observation on hearing threshold, brainstem evoked response and acoustic impedance. Chin Med J (Engl) 1994; 107:934-8. [PMID: 7882734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Four divers were compressed to 350 m to observe changes in hearing threshold, brainstem evoked response and acoustic impedance. The divers experienced no tinnitus, impairment of hearing, earache during compression. Examination showed that the threshold of lower frequency range of hearing was elevated because of the masking effect of the noise in the hyperbaric chamber. Changes in waveform and latency of brainstem evoked response were due to changes in sound wave transmission affected by the chamber pressure and a poor ratio of signal to noise in the hyperbaric environment with heliox. All these changes were transient. After leaving the chamber, the hearing threshold and brainstem evoked response returned to normal. Besides, there were no changes in tympanogram, acoustic compliance and stapedius reflex before and after diving. This indicated the designed speed of compression and decompression in the experiment caused no damage to the divers' acoustic system, and the functions of their Eustachain tubes, middle and inner ears were normal during the diving test.
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Affiliation(s)
- L Wang
- Navy General Hospital, Beijing
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38
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Gong JH, Maki G, Klingemann HG. Characterization of a human cell line (NK-92) with phenotypical and functional characteristics of activated natural killer cells. Leukemia 1994; 8:652-8. [PMID: 8152260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The cell line described here was established for a 50-year-old male patient with rapidly progressive non-Hodgkin's lymphoma whose marrow was diffusely infiltrated with large granular lymphocytes (LGL). Immunophenotyping of marrow blasts and peripheral lymphocytes was positive for CD56, CD2 and CD7, and negative for CD3. Cytotoxicity of peripheral blood mononuclear cells at an effector: target (E:T) cell ratio of 50:1 was 79% against K562 cells and 48% against Daudi cells. To establish the line, cells from the peripheral blood were placed into enriched alpha medium containing 12.5% fetal calf serum, 12.5% horse serum, 10(-4) M beta-mercaptoethanol and 10(-6) M hydrocortisone. Growth of the line (termed NK-92) is dependent on the presence of recombinant IL-2 and a dose as low as 10 U/ml is sufficient to maintain proliferation. Conversely, cells die within 72 h when deprived of IL-2; IL-7 and IL-12 do not maintain long-term growth, although IL-7 induces short-term proliferation measured by 3H-thymidine incorporation. None of the other cytokines tested (IL-1 alpha, IL-6, TNF-alpha, IFN-alpha, IFN-gamma) supported growth of NK-92 cells which have the following characteristics: surface marker positive for CD2, CD7, CD11a, CD28, CD45, CD54, CD56bright; surface marker negative for CD1, CD3, CD4, CD5, CD8, CD10, CD14, CD16, CD19, CD20, CD23, CD34, HLA-DR. DNA analysis showed germline configuration for T-cell receptor beta and gamma genes. CD25 (p55 IL-2 receptor) is expressed on about 50% of all cells when tested at 100 U/ml of IL-2 and its expression correlates inversely with the IL-2 concentration. The p75 IL-2 receptor is expressed on about half of the cells at low density irrespective of the IL-2 concentration. NK-92 cells kill both K562 and Daudi cells very effectively in a 4 h51-chromium release assay (84 and 86% respectively, at an E:T cell ratio of 5:1). The cell line described here thus displays characteristics of activated NK-cells and could be a valuable tool to study their biology.
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Affiliation(s)
- J H Gong
- Leukemia/Bone Marrow Transplant Program of British Columbia, BC Cancer Agency, Vancouver
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39
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Gong JH, Gao L, Zhang LY. [Pulmonary lymphangiomyomatosis: report of a case]. Zhonghua Nei Ke Za Zhi 1993; 32:313-5. [PMID: 8269759] [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: 01/29/2023]
Abstract
A case of pulmonary lymphangiomyomatosis in a 28-year-old woman with dyspnea, hemoptysis, chylothorax and irregular menstruation as presenting symptoms was reported. Chest CT scan showed the presence of pleural effusion on right side and a honeycomb pattern throughout the lung parenchyma bilaterally. The diagnosis was confirmed histologically by transbronchial lung biopsy. Medroxyprogesterone was administered; improvement in arterial blood gas analysis and reduction of the amount of pleural effusion were noted after one month. The etiology, clinical manifestations, pathological characteristics and treatment of this disease were discussed.
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Affiliation(s)
- J H Gong
- Department of Internal Medicine, Beijing Hospital
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40
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Bender A, Sprenger H, Gong JH, Henke A, Bolte G, Spengler HP, Nain M, Gemsa D. The potentiating effect of LPS on tumor necrosis factor-alpha production by influenza A virus-infected macrophages. Immunobiology 1993; 187:357-71. [PMID: 7687236 DOI: 10.1016/s0171-2985(11)80350-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Infection of murine PU5-1.8 macrophages and human monocytes by influenza A virus was associated with virus replication, release of tumor necrosis factor-alpha (TNF-alpha) and subsequent cell death. In the presence of small and by itself rather inefficient concentrations of lipopolysaccharide (LPS) or free lipid A (1 to 10 ng/ml), TNF-alpha production of virus-infected macrophages was strongly potentiated. LPS-triggered and enhanced TNF-alpha release from virus-infected macrophages was neither due to increased cell survival nor altered virus replication, potentiated TNF-alpha gene transcription, release of intracellularly stored TNF-alpha or shifts in the kinetics of TNF-alpha secretion. Influenza A virus infection alone induced a massive TNF-alpha mRNA accumulation which, however, was only weakly translated into bioactive TNF-alpha protein. When these virus-primed macrophages were exposed to LPS either simultaneously or up to 4 h after infection, an efficient and high translation into TNF-alpha protein occurred. Although the LPS-induced biochemical pathways leading to an augmented TNF-alpha production by virus-infected macrophages still remains unsolved, the findings suggest that the frequently observed serious clinical complications in the course of combined influenza A virus and bacterial infections may be due, at least in part, to an excessive release of cytokines such as TNF-alpha.
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Affiliation(s)
- A Bender
- Institute of Immunology, Philipps University, Marburg, Germany
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41
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Zheng XY, Gong JH. Cochlear degeneration in guinea pigs after repeated hyperbaric exposures. Aviat Space Environ Med 1992; 63:360-3. [PMID: 1599382] [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 effects of repeated hyperbaric exposures on inner ear function and morphology in guinea pigs were investigated with auditory electrophysiological testing, histopathological and electron microscopic techniques associated with enzyme histochemical method. The results showed that repeated hyperbaric exposures, though considered "safe," did cause damage to the cochlear system. Possible causes of the pathology include direct effects of repeated compression and decompression on the ear, and the possibility of inner ear decompression sickness and barotrauma cannot be excluded.
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Affiliation(s)
- X Y Zheng
- Department of Diving Medicine, Naval Medical Research Institute, Shanghai, China
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42
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Gong JH. [Preterm delivery and its risk factors]. Zhonghua Fu Chan Ke Za Zhi 1992; 27:22-4, 58. [PMID: 1505273] [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
A case-control study on preterm delivery was conducted in Jianan and Jianhan District, Wuhan City in 1988. 130 singleton preterm infants were included with 260 term infants as control. The results showed that the risk factors in prematurity were edema-proteinuria-hypertension syndrome (OR 1.8), maternal diseases in pregnancy (OR 1.6), hyperemesis gravidarum (OR 5.1), vaginal bleeding during pregnancy (OR 2.4), premature rupture of membranes (OR 3.6), low weight gain and low average weight gain per week during pregnancy, psychosocial stress during pregnancy, inadequate prenatal care, maternal stature less than 158 cm (OR 1.7), menarche before age 12 (OR 4.3), multi-gravida (OR 2.1), previous induced abortion (OR 2.1) and passive cigarette smoking during pregnancy. The author suggests that early treatment of complications of pregnancy and forcing prenatal care should be emphasized in order to reduce the incidence of preterm births.
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Affiliation(s)
- J H Gong
- Children Health Care Guiding Centre of China, Wuhan
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43
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Gong JH, Sprenger H, Hinder F, Bender A, Schmidt A, Horch S, Nain M, Gemsa D. Influenza A virus infection of macrophages. Enhanced tumor necrosis factor-alpha (TNF-alpha) gene expression and lipopolysaccharide-triggered TNF-alpha release. The Journal of Immunology 1991. [DOI: 10.4049/jimmunol.147.10.3507] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
We have previously shown that infection of macrophages by influenza A virus is capable of priming for a high TNF-alpha production in response to LPS. The present study was designed to examine in more detail TNF-alpha gene expression and TNF-alpha protein release of virus-infected, murine PU5-1.8 macrophages in the presence or absence of low and by itself rather inefficient concentrations of LPS (10 ng/ml). Although influenza A virus infection alone induced a massive TNF-alpha mRNA accumulation, translation into the bioactive TNF-alpha protein was low as intra- and extracellularly determined by bioassay, specific ELISA and Western blot. However, when LPS was added simultaneously or up to 4 h after infection, a high TNF-alpha production was initiated. The virus-induced TNF-alpha mRNA accumulation appeared to be due to both transcriptional and post-transcriptional changes: an enhanced TNF-alpha gene transcription as determined by nuclear run-on transcription assay and a markedly prolonged half-life of TNF-alpha mRNA as shown in actinomycin D-treated macrophages. These findings imply that influenza A virus may 1) either directly or indirectly stimulate TNF-alpha gene transcription activators or may interfere with labile transcription repressor proteins and 2) may stabilize TNF-alpha mRNA by delaying its degradation. Both mechanisms, taken together, prime influenza A virus-infected macrophages for a high TNF-alpha release in response to LPS which, as clinical cases show, may adversely affect patients with combined influenza A virus and bacterial infections.
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Affiliation(s)
- J H Gong
- Institute of Immunology, Philipps University, Marburg, Germany
| | - H Sprenger
- Institute of Immunology, Philipps University, Marburg, Germany
| | - F Hinder
- Institute of Immunology, Philipps University, Marburg, Germany
| | - A Bender
- Institute of Immunology, Philipps University, Marburg, Germany
| | - A Schmidt
- Institute of Immunology, Philipps University, Marburg, Germany
| | - S Horch
- Institute of Immunology, Philipps University, Marburg, Germany
| | - M Nain
- Institute of Immunology, Philipps University, Marburg, Germany
| | - D Gemsa
- Institute of Immunology, Philipps University, Marburg, Germany
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44
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Gong JH, Sprenger H, Hinder F, Bender A, Schmidt A, Horch S, Nain M, Gemsa D. Influenza A virus infection of macrophages. Enhanced tumor necrosis factor-alpha (TNF-alpha) gene expression and lipopolysaccharide-triggered TNF-alpha release. J Immunol 1991; 147:3507-13. [PMID: 1940351] [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: 12/29/2022]
Abstract
We have previously shown that infection of macrophages by influenza A virus is capable of priming for a high TNF-alpha production in response to LPS. The present study was designed to examine in more detail TNF-alpha gene expression and TNF-alpha protein release of virus-infected, murine PU5-1.8 macrophages in the presence or absence of low and by itself rather inefficient concentrations of LPS (10 ng/ml). Although influenza A virus infection alone induced a massive TNF-alpha mRNA accumulation, translation into the bioactive TNF-alpha protein was low as intra- and extracellularly determined by bioassay, specific ELISA and Western blot. However, when LPS was added simultaneously or up to 4 h after infection, a high TNF-alpha production was initiated. The virus-induced TNF-alpha mRNA accumulation appeared to be due to both transcriptional and post-transcriptional changes: an enhanced TNF-alpha gene transcription as determined by nuclear run-on transcription assay and a markedly prolonged half-life of TNF-alpha mRNA as shown in actinomycin D-treated macrophages. These findings imply that influenza A virus may 1) either directly or indirectly stimulate TNF-alpha gene transcription activators or may interfere with labile transcription repressor proteins and 2) may stabilize TNF-alpha mRNA by delaying its degradation. Both mechanisms, taken together, prime influenza A virus-infected macrophages for a high TNF-alpha release in response to LPS which, as clinical cases show, may adversely affect patients with combined influenza A virus and bacterial infections.
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Affiliation(s)
- J H Gong
- Institute of Immunology, Philipps University, Marburg, Germany
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45
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Hinder F, Schmidt A, Gong JH, Bender A, Sprenger H, Nain M, Gemsa D. Influenza A virus infects macrophages and stimulates release of tumor necrosis factor-alpha. Pathobiology 1991; 59:227-31. [PMID: 1883518 DOI: 10.1159/000163651] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The clinical picture of influenza A virus infections indicates that release of tumor necrosis factor-alpha (TNF-alpha) may be involved. In the present study we exposed the murine macrophage line PU5-1.8 to influenza A virus and observed a productive infection which was followed by subsequent cell death. Infection of macrophages was accompanied by TNF-alpha mRNA accumulation and TNF-alpha release. TNF-alpha production could only be induced by live virus whereas interferon release was also stimulated by inactivated virus. When virus-infected macrophages were exposed to low amounts of lipopolysaccharide (LPS; 1-10 ng/ml) TNF-alpha production was strongly potentiated. These data show that low LPS concentrations could readily trigger a high TNF-alpha release from influenza-A-virus-infected macrophages which could, at least partially, explain the serious complications of combined influenza A virus and bacterial infections.
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Affiliation(s)
- F Hinder
- Institute of Immunology, Philipps University, Marburg, FRG
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46
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Gong JH, Renz H, Sprenger H, Nain M, Gemsa D. Enhancement of tumor necrosis factor-alpha gene expression by low doses of prostaglandin E2 and cyclic GMP. Immunobiology 1990; 182:44-55. [PMID: 1965895 DOI: 10.1016/s0171-2985(11)80582-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Macrophage-derived PGE2 is usually considered to be a down-regulator of TNF-alpha production. However, we recently demonstrated that PGE2 may display dual activities in that low concentrations stimulated whereas higher doses suppressed TNF-alpha synthesis in resident peritoneal macrophages. To examine the underlying molecular mechanisms, we studied TNF-alpha gene expression in rat peritoneal macrophages and the murine PU5-1.8 macrophage line. In both macrophage types, PGE2 enhanced TNF-alpha gene transcription and production at an optimal concentration of 1 ng/ml. Furthermore, evidence was obtained that PGE2 may stimulate TNF-alpha mRNA accumulation via a rise of the intracellular messenger cGMP. Both, exogenously added as well as endogenously, by sodium nitroprusside generated cGMP were found to enhance TNF-alpha gene expression and production. These findings lend further support to the concept that cGMP may represent one of the positive signals for TNF-alpha synthesis.
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Affiliation(s)
- J H Gong
- Institute of Immunology, Philipps University, Marburg, Germany
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47
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Nain M, Hinder F, Gong JH, Schmidt A, Bender A, Sprenger H, Gemsa D. Tumor necrosis factor-alpha production of influenza A virus-infected macrophages and potentiating effect of lipopolysaccharides. The Journal of Immunology 1990. [DOI: 10.4049/jimmunol.145.6.1921] [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] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Influenza A virus infections are commonly associated with symptoms that suggest involvement of TNF-alpha. In this study, we exposed human monocytes, rat alveolar macrophages, and murine PU5-1.8 macrophages to influenza A virus, strain Puerto Rico 8. We observed a productive infection that was accompanied by TNF-alpha mRNA accumulation, TNF-alpha release and subsequent cell death. TNF-alpha production was dependent on exposure to live virus, in contrast to IFN release that was also induced by UV-inactivated virus. Most strikingly, low amounts of LPS (1 to 10 ng/ml) from Escherichia coli or Haemophilus influenzae were capable of strongly potentiating TNF-alpha production from virus-infected macrophages. The potentiating effect of LPS was neither due to increased survival of macrophages nor to altered virus multiplication, enhanced TNF-alpha gene expression, discharge of intracellular TNF-alpha stores, or shifts in the kinetics of TNF-alpha release. Thus, low amounts of LPS, which could easily be present in vivo, may serve as a potent trigger signal for TNF-alpha production from macrophages that have been primed by influenza A virus infection. These data suggest that the frequently observed serious complications of combined influenza A virus and bacterial infections may be partially due to a high TNF-alpha production.
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Affiliation(s)
- M Nain
- Institute of Immunology, Philipps University, Marburg, West Germany
| | - F Hinder
- Institute of Immunology, Philipps University, Marburg, West Germany
| | - J H Gong
- Institute of Immunology, Philipps University, Marburg, West Germany
| | - A Schmidt
- Institute of Immunology, Philipps University, Marburg, West Germany
| | - A Bender
- Institute of Immunology, Philipps University, Marburg, West Germany
| | - H Sprenger
- Institute of Immunology, Philipps University, Marburg, West Germany
| | - D Gemsa
- Institute of Immunology, Philipps University, Marburg, West Germany
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48
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Nain M, Hinder F, Gong JH, Schmidt A, Bender A, Sprenger H, Gemsa D. Tumor necrosis factor-alpha production of influenza A virus-infected macrophages and potentiating effect of lipopolysaccharides. J Immunol 1990; 145:1921-8. [PMID: 2391423] [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: 12/31/2022]
Abstract
Influenza A virus infections are commonly associated with symptoms that suggest involvement of TNF-alpha. In this study, we exposed human monocytes, rat alveolar macrophages, and murine PU5-1.8 macrophages to influenza A virus, strain Puerto Rico 8. We observed a productive infection that was accompanied by TNF-alpha mRNA accumulation, TNF-alpha release and subsequent cell death. TNF-alpha production was dependent on exposure to live virus, in contrast to IFN release that was also induced by UV-inactivated virus. Most strikingly, low amounts of LPS (1 to 10 ng/ml) from Escherichia coli or Haemophilus influenzae were capable of strongly potentiating TNF-alpha production from virus-infected macrophages. The potentiating effect of LPS was neither due to increased survival of macrophages nor to altered virus multiplication, enhanced TNF-alpha gene expression, discharge of intracellular TNF-alpha stores, or shifts in the kinetics of TNF-alpha release. Thus, low amounts of LPS, which could easily be present in vivo, may serve as a potent trigger signal for TNF-alpha production from macrophages that have been primed by influenza A virus infection. These data suggest that the frequently observed serious complications of combined influenza A virus and bacterial infections may be partially due to a high TNF-alpha production.
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Affiliation(s)
- M Nain
- Institute of Immunology, Philipps University, Marburg, West Germany
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Heidenreich S, Gong JH, Schmidt A, Nain M, Gemsa D. Macrophage activation by granulocyte/macrophage colony-stimulating factor. Priming for enhanced release of tumor necrosis factor-alpha and prostaglandin E2. J Immunol 1989; 143:1198-205. [PMID: 2473121] [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: 01/01/2023]
Abstract
The macrophage-activating properties of murine recombinant granulocyte-macrophage (GM)-CSF were studied in murine peritoneal macrophages with respect to metabolism, endocytosis, PGE2 and TNF-alpha release, and tumor cytotoxicity. GM-CSF was found to be a potent stimulus for RNA and protein synthesis, glucose consumption, pinocytosis, and FcR-independent phagocytosis. Macrophages were activated by GM-CSF to kill TNF-alpha-insensitive Eb lymphoma cells but failed to generate cytotoxicity against TNF-alpha-sensitive L929 cells. Although GM-CSF alone was incapable of stimulating TNF-alpha release, it primed macrophages for elevated TNF-alpha production in response to IFN-gamma plus LPS. The priming effect of GM-CSF disappeared upon longer incubation (greater than 12 h) and was followed by a strongly reduced responsiveness to stimuli that release TNF-alpha. Late-stage suppression could be reverted by treatment with the cyclooxygenase blocker indomethacin, and GM-CSF-induced priming for enhanced TNF-alpha release was entirely restored. The responsible arachidonic acid product mediating suppression was found to be PGE2, because 1) GM-CSF-primed macrophages released enhanced amounts of PGE2 and 2) indomethacin-restored macrophages were again suppressed when exogenous PGE2 was added back in amounts produced by GM-CSF-primed macrophages. Although GM-CSF potently induced TNF-alpha gene transcription by 20 h of treatment, PGE2 interfered with translation into the secreted TNF-alpha protein. These data show that GM-CSF is capable of priming for the enhanced release of two factors, initially for TNF-alpha and subsequently for PGE2. The temporally delayed generation of these two mediators suggests an autoregulatory circuit in which the later produced PGE2 limits GM-CSF-induced macrophage activation.
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Affiliation(s)
- S Heidenreich
- Institute of Immunology, University of Marburg, West Germany
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Heidenreich S, Gong JH, Schmidt A, Nain M, Gemsa D. Macrophage activation by granulocyte/macrophage colony-stimulating factor. Priming for enhanced release of tumor necrosis factor-alpha and prostaglandin E2. The Journal of Immunology 1989. [DOI: 10.4049/jimmunol.143.4.1198] [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] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
The macrophage-activating properties of murine recombinant granulocyte-macrophage (GM)-CSF were studied in murine peritoneal macrophages with respect to metabolism, endocytosis, PGE2 and TNF-alpha release, and tumor cytotoxicity. GM-CSF was found to be a potent stimulus for RNA and protein synthesis, glucose consumption, pinocytosis, and FcR-independent phagocytosis. Macrophages were activated by GM-CSF to kill TNF-alpha-insensitive Eb lymphoma cells but failed to generate cytotoxicity against TNF-alpha-sensitive L929 cells. Although GM-CSF alone was incapable of stimulating TNF-alpha release, it primed macrophages for elevated TNF-alpha production in response to IFN-gamma plus LPS. The priming effect of GM-CSF disappeared upon longer incubation (greater than 12 h) and was followed by a strongly reduced responsiveness to stimuli that release TNF-alpha. Late-stage suppression could be reverted by treatment with the cyclooxygenase blocker indomethacin, and GM-CSF-induced priming for enhanced TNF-alpha release was entirely restored. The responsible arachidonic acid product mediating suppression was found to be PGE2, because 1) GM-CSF-primed macrophages released enhanced amounts of PGE2 and 2) indomethacin-restored macrophages were again suppressed when exogenous PGE2 was added back in amounts produced by GM-CSF-primed macrophages. Although GM-CSF potently induced TNF-alpha gene transcription by 20 h of treatment, PGE2 interfered with translation into the secreted TNF-alpha protein. These data show that GM-CSF is capable of priming for the enhanced release of two factors, initially for TNF-alpha and subsequently for PGE2. The temporally delayed generation of these two mediators suggests an autoregulatory circuit in which the later produced PGE2 limits GM-CSF-induced macrophage activation.
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Affiliation(s)
- S Heidenreich
- Institute of Immunology, University of Marburg, West Germany
| | - J H Gong
- Institute of Immunology, University of Marburg, West Germany
| | - A Schmidt
- Institute of Immunology, University of Marburg, West Germany
| | - M Nain
- Institute of Immunology, University of Marburg, West Germany
| | - D Gemsa
- Institute of Immunology, University of Marburg, West Germany
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