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Xia M, Shen Z, Zheng H, Yuan L, Hu J, Zhao Y, Zhou D, Bai X, Wang J, Li X, Dai W, Kang M, Zhou H, Wan R, Lu L, Hu B, Wan X, Cai X. Diagnostic Efficacy of a Novel Rotating Brush for Endoscopic Sampling of Malignant Biliary Strictures: A Multicenter Prospective Study. Am J Gastroenterol 2024:00000434-990000000-01062. [PMID: 38477473 DOI: 10.14309/ajg.0000000000002750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 03/06/2024] [Indexed: 03/14/2024]
Abstract
INTRODUCTION Although cytologic examination of biliary stricture brushings obtained by endoscopic retrograde cholangiopancreatography is commonly used for diagnosing malignant biliary strictures (MBSs), it has low sensitivity. Several new brushes have capabilities that are still being debated. We have developed a novel brush working from conventional back-and-forth movement to rotation in situ (RIS) that may be more efficient for MBS sampling. We aimed to compare the MBS detection sensitivity of our RIS brush with that of the conventional brush. METHODS In this multicenter prospective study, we enrolled patients who underwent endoscopic retrograde cholangiopancreatography for suspected MBSs involving biliary stricture brushings obtained using our RIS brush. The historical control group consisted of the 30-brushing arm of our previous randomized trial (patient inclusion, 2018-2020) that used the study design in the same centers and with the same endoscopists as were used in this study. The primary outcome was to compare the sensitivity and specificity of detecting MBSs by cytologic evaluation of biliary stricture brushings between the 2 groups. RESULTS We enrolled 155 patients in the intent-to-treat analysis. Using the same number of brushing cycles, the RIS brush showed a higher sensitivity than the conventional brush (0.73 vs 0.56, P = 0.003). In per-protocol population, the sensitivity was also higher in the RIS brush group than in the conventional brush group (0.75 vs 0.57, P = 0.002). Multivariate analysis revealed that the RIS brush was the only predictive factor for MBS detection. No significant differences were observed in procedure-related complications between the 2 groups. DISCUSSION The RIS brush was a promising tool for effective and safe MBS sampling and diagnosis. Further randomized studies are warranted to confirm our results (Chictr.org.cn, identifier: ChiCTR2100047270).
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Affiliation(s)
- Mingxing Xia
- Department of Gastroenterology and Endoscopy, The Third Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Zhenyang Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Haiming Zheng
- Department of Gastroenterology, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Lin Yuan
- Department of Pathology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai
| | - Jiangfeng Hu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yi Zhao
- Department of Gastroenterology and Endoscopy, The Third Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Dongxun Zhou
- Department of Gastroenterology and Endoscopy, The Third Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Xianghui Bai
- Department of Gastroenterology and Endoscopy, The Third Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Junjun Wang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaoman Li
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Weiming Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Mei Kang
- Clinical Research Center, Shanghai General Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Hui Zhou
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Rong Wan
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Lungen Lu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bing Hu
- Department of Gastroenterology and Endoscopy, The Third Affiliated Hospital of Naval Medical University, Shanghai, China
| | - Xinjian Wan
- Department of Gastroenterology, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaobo Cai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Zhou C, Shen Z, Shen B, Dai W, Sun Z, Guo Y, Xu X, Wang J, Lu J, Zhang Q, Luo X, Qu Y, Dong H, Lu L. FABP4 in LSECs promotes CXCL10-mediated macrophage recruitment and M1 polarization during NAFLD progression. Biochim Biophys Acta Mol Basis Dis 2023; 1869:166810. [PMID: 37487374 DOI: 10.1016/j.bbadis.2023.166810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 06/27/2023] [Accepted: 07/10/2023] [Indexed: 07/26/2023]
Abstract
BACKGROUND AND AIMS Non-alcoholic liver disease (NAFLD) is emerging as the leading cause of end-stage liver disease with a serious threat to global health burden. Fatty acid-binding protein 4 (FABP4) is closely associated with metabolic syndromes. We aimed to explore the potential mechanisms of FABP4 in NAFLD progression. MATERIALS AND METHODS For NAFLD mice, animals were fed with high fat diet (HFD) for 20 weeks. The assays of hematoxylin and eosin, Sirius Red, oil red O staining and immunohistology were performed to evaluate hepatic pathology. Flow cytometric analysis was used to distinguish macrophage subtypes. RESULTS Serum FABP4 level was positively correlate with the severity of hepatic steatosis in NAFLD patients. FABP4 expression was mainly distributed in liver sinusoidal endothelial cells (LSECs), which was significantly increased in HFD mice. The level of CXCL10 was positively correlated with FABP4 at mRNA and serum level. FABP4 inhibition resulted in decreased expression of CXCL10. The percentage of M1 macrophage and CXCR3+ cells in infiltrated macrophage was increased in liver of HFD mice. Inhibition of FABP4 ameliorated HFD-induced M1 macrophage polarization as well as CXCR3+ macrophages recruitment. Recombinant CXCL10 and co-culturing with TMNK-1 stimulated macrophage toward M1 polarization, which could be reversed by CXCR3 inhibitor. Palmitic acid treatment resulted in increased nuclear P65 expression, which could be reversed by inhibiting FABP4. Cxcl10 expression was dramatically suppressed by NF-κB inhibitor. CONCLUSIONS FABP4 in LSECs may play a pathogenic role in NAFLD course by promoting CXCL10-mediated macrophage M1 polarization and CXCR3+ macrophage infiltration via activating NF-κB/p65 signaling.
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Affiliation(s)
- Cui Zhou
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhenyang Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bo Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Weiming Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhongsang Sun
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yuecheng Guo
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xianjun Xu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Junjun Wang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Jingyi Lu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Qingqing Zhang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xin Luo
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Ying Qu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Hui Dong
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Lungen Lu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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Shen Z, Dai W, Guo Y, Wang J, Shen B, Li B, Lu L, Cai X. Yes-associated protein promotes the proliferation and differentiation of liver progenitor cells during liver fibrosis. FASEB J 2023; 37:e22916. [PMID: 37073611 DOI: 10.1096/fj.202201919r] [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] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 02/27/2023] [Accepted: 03/29/2023] [Indexed: 04/20/2023]
Abstract
Liver fibrosis is closely related to the proliferation and differentiation of liver progenitor cells (LPCs). Yes-associated protein (YAP) is a key effector molecule of the Hippo signaling pathway and plays an important role in regulating cell proliferation and liver homeostasis. However, its role in LPCs proliferation and differentiation during liver fibrosis are not well understood. Using immunohistochemistry, immunofluorescence staining, quantitative PCR and Western blotting, we discovered that LPCs expansion and enhanced YAP expression in LPCs in either choline-deficient, ethionine-supplemented (CDE) diet or 3,5-diethoxycarbonyl-1,4-dihydrocollidine (DDC) diet-induced fibrotic mice, as well as in patients with liver fibrosis. By injecting adeno-associated virus vectors under the transcriptional control of Lgr5 promoter, we found that targeted knockdown of YAP in LPCs attenuated the CDE/DDC diet-induced ductular reaction and liver fibrosis. Using EdU incorporation and Cell Counting Kit-8 assays, we demonstrated that YAP can modulate LPCs proliferation. Importantly, spleen transplantation of YAP-overexpressing LPCs improved their ability to differentiate into hepatocytes and alleviated carbon tetrachloride-induced liver fibrosis. Collectively, our findings indicate that LPCs expansion and differentiation during liver fibrosis could be modulated by YAP, further suggesting the possibility of manipulating YAP expression in LPCs as a potential treatment for chronic liver diseases.
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Affiliation(s)
- Zhenyang Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Weiming Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yuecheng Guo
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Junjun Wang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bo Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Binghang Li
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Lungen Lu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaobo Cai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Shen Z, Shen B, Dai W, Zhou C, Luo X, Guo Y, Wang J, Xu X, Sun Z, Cai X, Dong H, Lu L. Expansion of macrophage and liver sinusoidal endothelial cell subpopulations during non-alcoholic steatohepatitis progression. iScience 2023; 26:106572. [PMID: 37124414 PMCID: PMC10131129 DOI: 10.1016/j.isci.2023.106572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2022] [Revised: 12/19/2022] [Accepted: 03/28/2023] [Indexed: 04/08/2023] Open
Abstract
Liver non-parenchymal cells (NPCs) play a critical role in the progression of non-alcoholic steatohepatitis (NASH). We aimed to explore the heterogeneity of NPCs and identify NASH-specific subpopulations contributing to NASH progression. Through single-cell RNA sequencing, we uncovered a proinflammatory subpopulation of Itgadhi/Fcrl5hi macrophages with potential function of modulating macrophage accumulation and promoting NASH development. We also identified subpopulations of Egr1hi and Ly6ahi liver sinusoidal endothelial cells (LSECs), which might participate in pathological angiogenesis and inflammation regulation. The Itgadhi/Fcrl5hi macrophages, Egr1hi LSECs, and Ly6ahi LSECs emerged in the early stage and expanded significantly along with pathological progression of liver injury during NASH. Cell-cell interactions between hepatic stellate cells (HSCs) and Itgadhi/Fcrl5hi macrophages, Egr1hi LSECs or Ly6ahi LSECs were enhanced in NASH liver. Our results revealed that expansion of Itgadhi/Fcrl5hi macrophages, Egr1hi LSECs or Ly6ahi LSECs was strongly associated with NASH severity, suggesting these subpopulations might be involved in NASH progression.
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Dai W, Guo Y, Shen Z, Wang J, Lu L, Dong H, Cai X. Identification of LBH and SPP1 involved in hepatic stellate cell activation during liver fibrogenesis. Hum Cell 2023; 36:1054-1067. [PMID: 36917392 DOI: 10.1007/s13577-023-00889-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Accepted: 03/01/2023] [Indexed: 03/16/2023]
Abstract
Liver fibrosis is a pathological response driven by the activation of hepatic stellate cell (HSC). However, the mechanisms of liver fibrosis and HSC activation are complicated and far from being fully understood. We aimed to explore the candidate genes involved in HSC activation during liver fibrogenesis. Five genes (LBH, LGALS3, LOXL1, S100A6 and SPP1) were recurrent in the DEGs derived from the seven datasets. The expression of these genes gradually increased as liver fibrosis staging advanced, suggesting they might be candidate genes involved in HSC activation during hepatic fibrosis. These candidate genes were predicted to be coregulated by miRNAs such as hsa-miR-125a-5p and has-miR-125b, or by transcription factors including JUN, USF1, TP53 and TFAP2C. PPI analysis showed that LGALS3, LOXL1, S100A6 and SPP1 might interact with each other indirectly, but no interaction was found between them and LBH. The candidate genes and their interaction partners were enriched in focal adhesion, extracellular matrix organization and binding. Upregulation of LBH, S100A6 and SPP1 were further validated in TGF-β-treated LX-2 as well as in DDC or CCL4-treated mice models. Decreased LBH and SPP1 expression reduces the expression of HSC activation-related markers in TGF-β-treated LX-2. Our results indicated that LBH, LGALS3, LOXL1, S100A6 and SPP1 were candidate genes which may participate in the HSC activation during liver fibrosis.
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Affiliation(s)
- Weiming Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yuecheng Guo
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhenyang Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Junjun Wang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Lungen Lu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Hui Dong
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. .,Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Xiaobo Cai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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Shen B, Zhou C, Gu T, Shen Z, Guo Y, Dai W, Liu Y, Zhang J, Lu L, Dong H. Kuhuang alleviates liver fibrosis by modulating gut microbiota-mediated hepatic IFN signaling and bile acid synthesis. Front Pharmacol 2022; 13:1080226. [PMID: 36582518 PMCID: PMC9792617 DOI: 10.3389/fphar.2022.1080226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Accepted: 12/02/2022] [Indexed: 12/15/2022] Open
Abstract
Background: Liver fibrosis is a common outcome of the pathological progression of chronic liver disease; however, no specific and effective therapeutic agent has been approved for its treatment. We investigated the effects of Kuhuang on liver fibrosis and the underlying mechanisms of action. Materials and methods: To induce hepatic fibrosis, either 3,5-diethoxycarbonyl-1,4-dihydro-collidine (DDC) diet was administered, or bile duct ligation (BDL) surgery was performed on C57BL/6 mice. Kuhuang was orally administered to mice for 7 days before and after bile duct ligation or 4 weeks with a DDC diet. Hematoxylin and eosin, Sirius red staining, and immunohistochemical analyses were performed to evaluate hepatic pathology. Hepatic interferon-β (IFN-β) levels were measured using an enzyme-linked immunosorbent assay. RNA sequencing was performed to examine the gene expression profiles of liver tissues. The mRNA expression of inflammatory, profibrotic, and bile acid (BA)-related genes was further validated by qRT-PCR. A targeted metabolomics assay revealed the alteration of the hepatic bile acid (BA) composition. The composition of the gut microbiota was determined via 16S rRNA sequencing. Results: Treatment with Kuhuang attenuated liver fibrosis and reduced the inflammatory response in bile duct ligation and DDC mouse models. In addition, the hepatic IFN signaling pathway was activated following Kuhuang treatment. Kuhuang treatment also significantly decreased hepatic levels of both primary and secondary BAs. In addition, Kuhuang treatment altered gut microbiota composition, with an increased abundance of interferon-inducing Akkermansia and decreased abundance of bile salt hydrolase-producing Lactobacillus, Clostridium, and Bifidobacterium. Furthermore, the abundance of Akkermansia was positively correlated with the hepatic mRNA expression levels of Ifna4, Ifnb, and Isg15, whereas that of Lactobacillus, Clostridium - sensu - stricto - 1, and Bifidobacterium was positively correlated with levels of bile acid synthesis-related genes. Conclusion: Our results suggest that Kuhuang plays a protective role during the progression of liver fibrosis, potentially by altering the composition of the gut microbiota, which consequently activates interferon signaling and inhibits bile acid synthesis in the liver.
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Affiliation(s)
- Bo Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Cui Zhou
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Tianyi Gu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhenyang Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yuecheng Guo
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Weiming Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yang Liu
- Suzhou Leiyunshang Pharmacology Group, Shanghai, China
| | - Jie Zhang
- Suzhou Leiyunshang Pharmacology Group, Shanghai, China
| | - Lungen Lu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China,*Correspondence: Lungen Lu, ; Hui Dong,
| | - Hui Dong
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China,*Correspondence: Lungen Lu, ; Hui Dong,
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Wang J, Xia M, Jin Y, Zheng H, Shen Z, Dai W, Li X, Kang M, Wan R, Lu L, Hu B, Wan X, Cai X. More Endoscopy-Based Brushing Passes Improve the Detection of Malignant Biliary Strictures: A Multicenter Randomized Controlled Trial. Am J Gastroenterol 2022; 117:733-739. [PMID: 35108222 DOI: 10.14309/ajg.0000000000001666] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Accepted: 01/20/2022] [Indexed: 02/07/2023]
Abstract
INTRODUCTION Endoscopic biliary brushing is the most common method used for sampling in patients with malignant biliary strictures (MBSs); however, its sensitivity is relatively low. There is still no consensus on endoscopy-based biliary brushing, although brushing 10 times in 1 specimen is routinely performed. This study was designed to compare the sensitivity of brush cytology for 10, 20, or 30 brushing times of a pass in 1 specimen in patients with MBSs. METHODS In this multicenter, prospective, randomized controlled study, patients who underwent endoscopic retrograde cholangiopancreatography for suspected MBSs were enrolled. Patients were randomly assigned to receive 10, 20, and 30 brushing times of a pass. The primary outcome was to compare the sensitivity of brush cytology among the 3 groups. Patients were prospectively followed up for 6 months after endoscopic brushing for malignancy diagnosis. RESULTS A total of 443 patients were enrolled for intention-to-treat analysis (147, 148, and 148 patients in the 10-times, 20-times, and 30-time groups, respectively). The 3 groups were similar in baseline characteristics. The sensitivity of brush cytology was 38%, 47%, and 57% in the 10-times, 20-times, and 30-times groups, respectively, and the 30-times group showed significantly higher sensitivity than the 10-times group (P = 0.001). The multivariate analysis revealed that stricture length and the number of brushing passes were significant factors for the detection of biliary malignancy. No significant differences were observed in procedure-related complications among the 3 groups. DISCUSSION Brushing 30 times could increase the diagnostic sensitivity without increasing complications and seems to be preferred for the endoscopic sampling and diagnosis of MBSs (chictr.org.cn, identifier: ChiCTR1800015978).
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Affiliation(s)
- Junjun Wang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Mingxing Xia
- Department of Endoscopy, Eastern Hepatobiliary Hospital, Second Military Medical University, Shanghai, China
| | - Yubiao Jin
- Department of Pathology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Haiming Zheng
- Department of Gastroenterology, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhenyang Shen
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Weiming Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaoman Li
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Mei Kang
- Clinical Research Center, Shanghai General Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Rong Wan
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Lungen Lu
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bing Hu
- Department of Endoscopy, Eastern Hepatobiliary Hospital, Second Military Medical University, Shanghai, China
| | - Xinjian Wan
- Department of Gastroenterology, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xiaobo Cai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
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Wang J, Hu W, Shen Z, Liu T, Dai W, Shen B, Li X, Wu J, Lu L, Li S, Cai X. Dissecting the single-cell transcriptomeunderlying chronic liver injury. Mol Ther Nucleic Acids 2021; 26:1364-1373. [PMID: 34900395 PMCID: PMC8626669 DOI: 10.1016/j.omtn.2021.11.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 09/17/2021] [Accepted: 11/03/2021] [Indexed: 12/17/2022]
Abstract
Chronic liver disease (CLD) is currently a major health problem worldwide, which is accompanied by chronic liver injury and lack of clinically effective treatment; however, systematic characterization of chronic liver injury procedures at single-cell resolution is lacking. In the present study, we established chronic liver injury mouse models and conducted single-cell RNA sequencing (scRNA-seq), including choline-deficient, ethionine-supplemented (CDE) and 3,5-diethoxycarbonyl 1,4-dihydrocollidinen (DDC) mouse models. We captured in total 16,389 high-quality cells and identified 12 main cell types in scRNA-seq data. Macrophages and endothelial cells are the largest cell populations in our dataset. Transcriptional trajectory analysis revealed different expression patterns of cells between CDE and DDC models and identified potential liver injury markers, such as Ets1, Gda, Itgam, and Sparc. Differential analysis identified 25 and 152 differentially expressed genes in CDE and DDC macrophages, respectively. In addition, 413 genes were detected to exclusively express in specific pseudotime states of macrophages. These genes were found to participate in immune-related biological processes. Further cell-cell communication analysis found extensive receding of cell-cell interactions between different cell types in the liver injury process, especially in the DDC model. Our study characterized the single-cell transcriptional landscape in the process of chronic liver injury, promoting the understanding of the underlying molecular mechanisms and providing candidate clinical strategy for effective intervention of chronic liver diseases.
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Affiliation(s)
- Junjun Wang
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, Chin
| | - Wei Hu
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Zhenyang Shen
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, Chin
| | - Teng Liu
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Weiming Dai
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, Chin
| | - Bo Shen
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, Chin
| | - Xiaoman Li
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, Chin
| | - Jingni Wu
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Lungen Lu
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, Chin
| | - Shengli Li
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
| | - Xiaobo Cai
- Department of Gastroenterology, Precision Research Center for Refractory Diseases, Institute for Clinical Research, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, China
- Shanghai Key Laboratory of Pancreatic Diseases, Shanghai Jiao Tong University School of Medicine, Shanghai 201620, Chin
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9
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Li Z, Dai W, Yang L, Wan R, Cai X. Percutaneous-endoscopic rendezvous via cap-assisted adult colonoscope to deal with biliary and multiple intestine strictures after total gastrectomy. Endoscopy 2021; 53:E380-E381. [PMID: 33271618 DOI: 10.1055/a-1304-3304] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
- Zhenghong Li
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, China
| | - Weiming Dai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, China
| | - Lijuan Yang
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, China
| | - Rong Wan
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, China
| | - Xiaobo Cai
- Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiaotong University, School of Medicine, Shanghai, China
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10
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Hu JL, Tao H, Li JX, Dai WM, Song B, Sun JF, Liu P, Tang J, Liu WY, Wang SY, Zhu FC. Safety and immunogenocity of a novel combined Haemophilus influenzae type b-Neisseria meningitidis serogroups A and C-tetanus-toxoid conjugate vaccine in healthy Chinese children aged 6 months to 5 years old. Hum Vaccin Immunother 2015; 11:1120-8. [PMID: 25833163 PMCID: PMC4514299 DOI: 10.1080/21645515.2015.1033592] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Revised: 03/06/2015] [Accepted: 03/20/2015] [Indexed: 10/23/2022] Open
Abstract
A novel combined Haemophilus influenzae type b-Neisseria meningitidis serogroups A and C-tetanus-toxoid conjugate vaccine (Hib-MenAC vaccine) has been developed to protect children against diseases caused by Hib, MenA, and MenC. This study investigated the safety and immunogenicity of the Hib-MenAC vaccine administered in 2-dose series to children aged 6-23 months and in a single dose to children aged 2-5 y. A randomized, positive-controlled, non-inferiority clinical trial was conducted for 1200 healthy participants in each age group. Within each age group, participants were randomly allocated to the Hib-MenAC group or the control group at a ratio of 1:1. Adverse reactions were recorded within 28 d after each dose. Blood samples were obtained to assess immunogenicity on day 0 and at 28 d after a complete vaccination course. For the investigational vaccine, the incidence of total adverse reactions in vaccinees aged 6-23 months was 46.8% and that in vaccinees aged 2-5 y was 29.8%. Most adverse reactions were mild or moderate. One non-fatal serious adverse event occurred in the Hib-MenAC group, but was unrelated to vaccination. The seroconversion rate to the 3 components reached 94.0%, and the proportion of vaccinees with rSBA titers ≥ 1:8 and PRP ≥ 0.15 g/mL reached 97.0% in both age groups. The safety and immunogenicity of the Hib-MenAC vaccine were non-inferior when compared to the licensed vaccines. It was concluded that the novel vaccine would be expected to protect children against all of the targeted diseases.
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Key Words
- ATP, according to protocol
- CI, confidence interval
- EPI, Expanded Program on Immunization
- GMCs, geometric mean concentrations
- GMTs, geometric mean titers
- Haemophilus influenzae type b
- Hib, Haemophilus influenzae
- Hib-MenAC vaccine, combined Haemophilus influenzae
- MenA, Neisseria meningitidis serogroup A
- MenC, Neisseria meningitidis serogroup C
- Neisseria meningitidis
- PRP, polyribosylribitol phosphate
- RD, rate difference
- SAEs, serious adverse events
- children
- china
- conjugate vaccine
- rSBA, a serum bactericidal assay using baby rabbit complement
- type b
- type b–Neisseria meningitidis serogroups A and C-tetanus-toxoid conjugate vaccine
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MESH Headings
- Antibodies, Bacterial/blood
- Child, Preschool
- China
- Drug-Related Side Effects and Adverse Reactions/epidemiology
- Drug-Related Side Effects and Adverse Reactions/pathology
- Female
- Haemophilus Infections/prevention & control
- Haemophilus Vaccines/administration & dosage
- Haemophilus Vaccines/adverse effects
- Haemophilus Vaccines/immunology
- Haemophilus influenzae type b/immunology
- Humans
- Incidence
- Infant
- Male
- Meningococcal Infections/prevention & control
- Meningococcal Vaccines/administration & dosage
- Meningococcal Vaccines/adverse effects
- Meningococcal Vaccines/immunology
- Neisseria meningitidis, Serogroup A/immunology
- Neisseria meningitidis, Serogroup C/immunology
- Tetanus Toxoid/administration & dosage
- Tetanus Toxoid/immunology
- Vaccines, Combined/administration & dosage
- Vaccines, Combined/adverse effects
- Vaccines, Combined/immunology
- Vaccines, Conjugate/administration & dosage
- Vaccines, Conjugate/adverse effects
- Vaccines, Conjugate/immunology
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Affiliation(s)
- Jian-li Hu
- Jiangsu Province Center for Disease Control and Prevention; Nanjing, Jiangsu, China
| | - Hong Tao
- Jiangsu Province Center for Disease Control and Prevention; Nanjing, Jiangsu, China
| | - Jing-xin Li
- Jiangsu Province Center for Disease Control and Prevention; Nanjing, Jiangsu, China
- College of Pharmacy; Third Military Medical University & National Engineering Research Center for Immunological Products; Chongqing, China
| | - Wei-ming Dai
- Jiangsu Province Center for Disease Control and Prevention; Nanjing, Jiangsu, China
| | - Bin Song
- Royal (Wuxi) Biological Co., Ltd.; Wuxi, Jiangsu, China
| | - Jin-fang Sun
- School of Public Health in Southeast University; Nanjing, Jiangsu, China
| | - Pei Liu
- School of Public Health in Southeast University; Nanjing, Jiangsu, China
| | - Jie Tang
- Funing County Center for Disease Control and Prevention; Yancheng, Jiangsu, China
| | - Wen-yu Liu
- Funing County Center for Disease Control and Prevention; Yancheng, Jiangsu, China
| | - Shi-yuan Wang
- School of Public Health in Southeast University; Nanjing, Jiangsu, China
| | - Feng-cai Zhu
- Jiangsu Province Center for Disease Control and Prevention; Nanjing, Jiangsu, China
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11
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Li B, Wang C, Zhang Y, Zhao XY, Huang B, Wu PF, Li Q, Li H, Liu YS, Cao LY, Dai WM, Fang WG, Shang DS, Cao L, Zhao WD, Chen YH. Elevated PLGF contributes to small-cell lung cancer brain metastasis. Oncogene 2012; 32:2952-62. [DOI: 10.1038/onc.2012.313] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Lee RF, Dai W, Dix W. A decoupled circular-polarized volume head coil pair for studying two interacting human brains with MRI. Annu Int Conf IEEE Eng Med Biol Soc 2011; 2010:6645-8. [PMID: 21096733 DOI: 10.1109/iembs.2010.5627155] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
One of the major functions of the human brain is to mediate interactions with other people. Until recently, studying brain social interactions has not been possible due to the lack of measurable methods to observe two interacting minds simultaneously. We have developed a novel dual-head MRI coil that can scan two subjects' brains simultaneously while the subjects are socially interacting in one MRI scanner. Meanwhile, a novel scheme for decoupling two quadrature coils (not surface coils) is introduced and validated.
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Affiliation(s)
- Ray F Lee
- Princeton University, NJ 08540, USA.
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13
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Abstract
RNA editing of the pre-mRNA encoding the kainate receptor subtypes determines the Ca2+ permeability and the rectifying properties of the receptors in which these are assembled. GluR6 pre-mRNA contains three characterized editing sites: Q/R, IN and the Y/C, whereas GluR5 pre-mRNA contains only the (Q/R) site. Single cell RT-PCR was used on cultured cortical neurons to determine the relative expression and editing levels of the kainate receptor subunits encoding mRNA. The analysis showed a large intercellular variation in editing efficiency. The overall lower level of GluR5 editing, in the culture, compared to GluR6 editing is a result of an approximately 60% lower editing efficiency of GluR5 pre-mRNA, within single cells, compared with GluR6.
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Affiliation(s)
- K V Christensen
- Department of Molecular and Structural Biology C.F. Mollers Allé, University of Aarhus, Denmark
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14
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Zhou L, Ino A, Dai WM, Nishimoto S. Evidences for adduct formation between intracellular non-protein thiols and nitroazoles possessing an alpha,beta-unsaturated carbonyl side chain and the effects on radiosensitization of hypoxic cells. Bioorg Med Chem 1999; 7:2591-8. [PMID: 10632069 DOI: 10.1016/s0968-0896(99)00187-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [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: 11/28/2022]
Abstract
Reactivity of a number of nitroazole derivatives bearing an alpha,beta-unsaturated carbonyl group on the side chain toward non-protein thiols (NPSH) was examined both in the phosphate buffer solution and in the biological system. These alpha,beta-unsaturated compounds reacted with NPSH, such as glutathione (GSH) and L-cysteine (Cys), in the buffer solution to afford the 1,4-addition products. The reaction gave a second-order rate constant. The adducts of methyl 4-(2'-nitroimidazol-1'-yl)crotonate (1) with GSH and Cys were isolated and characterized as two diastereomers (7a,b and 8a,b) in ca. 1:1 ratio, respectively. Similarly, exposure of EMT6/KU cells to 1 at 1.0 mM for 1 h resulted in depletion of the intracellular NPSH by more than 80%. Over 50% of the depleted NPSH was attributed to the formation of the conjugated diastereomeric adducts. On the other hand, incubation of EMT6/KU cells with 1 at 1.0 mM under hypoxic conditions before X-ray irradiation caused concurrently a sharp reduction of the shoulder of the dose-survival curves (reduced the extrapolation number (n) from 8.0 to ca. 1.0) and an increase in the slope (decreased the mean lethal dose (Do) to ca. 50% of the control level). The observed effects of 1 on the dose-survival curves were due to the NPSH depletion through the Michael addition occurred in the cellular system. A fairly linear relationship was obtained between the n value and the reduced intracellular NPSH level. It indicated that the shoulder effect of the dose-survival curves of hypoxic cells should be the result of the NPSH depletion by the alpha,beta-unsaturated carbonyl group attached to the nitroazoles.
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Affiliation(s)
- L Zhou
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Japan.
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15
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Dai WM, Chow CW, Zhou L, Ishii A, Lau CW, Li Q, Hamaguchi W, Nishimoto S. Bifunctional 2-naphthyl propargylic sulfones exhibiting high DNA intercalating and alkylating activity. Bioorg Med Chem Lett 1999; 9:2789-94. [PMID: 10522692 DOI: 10.1016/s0960-894x(99)00475-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A number of novel 2-naphthyl propargylic sulfones were synthesized as nucleic base alkylating agents. Extremely high DNA cleavage activity was observed for the sulfones with a free omega-hydroxyl group in the carbon chain in contrast to the ester conjugates possessing an additional intercalating unit.
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Affiliation(s)
- W M Dai
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, China
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16
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Dai WM, Ebert B, Madsen U, Lambert JD. Studies of the antagonist actions of (RS)-2-amino-3-[5-tert-butyl-3-(phosphonomethoxy)-4-isoxazolyl] propionic acid (ATPO) on non-NMDA receptors in cultured rat neurones. Br J Pharmacol 1998; 125:1517-28. [PMID: 9884081 PMCID: PMC1565742 DOI: 10.1038/sj.bjp.0702236] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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] [Indexed: 11/08/2022] Open
Abstract
Whole-cell patch-clamp recordings from single cultured cortical neurones have been used to study the action of (RS)-2-amino-3-[5-tert-butyl-3-(phosphonomethoxy)-4-isoxazolyl+ ++]propionic acid (ATPO), which has previously been proposed to be a potent selective antagonist of 2-amino-3-(3-hydroxy-5-methyl-4-isoxazolyl)propionic acid (AMPA) receptors. ATPO competitively reduced peak responses evoked by semi-rapid applications of AMPA (Ki = 16 microM) but had variable effects on plateau responses, which were on average unchanged. Following blockade of AMPA receptor desensitization by cyclothiazide (CTZ, 100 microM), the plateau responses were reduced by ATPO to a similar extent as the peak responses, indicating that ATPO reduces desensitization of AMPA receptors. Semi-rapid application of kainic acid (KA) and the KA receptor-selective agonist, (2S,4R)-4-methylglutamic acid (MeGlu) evoked non-desensitizing responses which were competitively antagonized by ATPO (Ki values: 27 and 23 microM, respectively). Responses to MeGlu were unaffected by CTZ (100 microM), but potentiated 3 fold following blockade of KA receptor desensitization by concanavalin A (Con A, 300 microg ml(-1)). Responses of spinal cord neurones to MeGlu were blocked by ATPO to a similar extent before and after blockade of KA receptor desensitization by Con A. Although selectively potentiated by Con A, plateau responses to MeGlu were reduced by 69.6% by the AMPA selective antagonist, GYKI 53655 (10 microM). The remaining component was further reduced by ATPO with a Ki of 36 microM, which was not significantly different from that in the absence of GYKI 53655, but was greater than that on responses to AMPA. It is concluded that ATPO is a moderate-potency competitive inhibitor of naturally expressed non-NMDA receptors.
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Affiliation(s)
- W M Dai
- Department of Physiology, University of Aarhus, Denmark
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17
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Dai WM, Li Q, Fong KC, Chow CW, Zhou L, Hamaguchi W, Nishimoto S. Remarkable tethering effect on DNA cleavage of propargylic sulfone conjugates with intercalating moieties. Bioorg Med Chem Lett 1998; 8:169-74. [PMID: 9871648 DOI: 10.1016/s0960-894x(97)10203-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 11/25/2022]
Abstract
A number of novel propargylic sulfone conjugates 3 and 4 with intercalating moieties were synthesized and evaluated for DNA cleavage activity through nucleic base alkylation. A remarkable enhancement in DNA cleaving potency was observed with those conjugates 3 possessing a suitable spacer, a right attachment point at the aromatic ring, and a good intercalator.
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Affiliation(s)
- W M Dai
- Department of Chemistry, Hong Kong University of Science and Technology, Kowloon, China
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18
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Nicolaou KC, Dai WM, Tsay SC, Estevez VA, Wrasidlo W. Designed enediynes: a new class of DNA-cleaving molecules with potent and selective anticancer activity. Science 1992; 256:1172-8. [PMID: 1589797 DOI: 10.1126/science.256.5060.1172] [Citation(s) in RCA: 255] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The rational design and biological actions of a new class of DNA-cleaving molecules with potent and selective anticancer activity are reported. These relatively simple enediyne-type compounds were designed from basic chemical principles to mimic the actions of the rather complex naturally occurring enediyne anticancer antibiotics, particularly dynemicin A. Equipped with locking and triggering devices, these compounds damage DNA in vitro and in vivo on activation by chemical or biological means. Their damaging effects are manifested in potent anticancer activity with remarkable selectivities. Their mechanism of action involves intracellular unlocking and triggering of a Bergman reaction, leading to highly reactive benzenoid diradicals that cause severe DNA damage. The results of these studies demonstrate the potential of these de novo designed molecules as biotechnology tools and anticancer agents.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry, Scripps Research Institute, La Jolla, CA 92037
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