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Kan L, Zhang L, Dong LZ, Wang XH, Li RH, Guo C, Li X, Yan Y, Li SL, Lan YQ. Bridging the Homogeneous and Heterogeneous Catalysis by Supramolecular Metal-Organic Cages with Varied Packing Modes. Adv Mater 2024; 36:e2310061. [PMID: 38227292 DOI: 10.1002/adma.202310061] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Revised: 11/29/2023] [Indexed: 01/17/2024]
Abstract
Integrating the advantages of homogeneous and heterogeneous catalysis has proved to be an optimal strategy for developing catalytic systems with high efficiency, selectivity, and recoverability. Supramolecular metal-organic cages (MOCs), assembled by the coordination of metal ions with organic linkers into discrete molecules, have performed solvent processability due to their tunable packing modes, endowing them with the potential to act as homogeneous or heterogeneous catalysts in different solvent systems. Here, the design and synthesis of a series of stable {Cu3} cluster-based tetrahedral MOCs with varied packing structures are reported. These MOCs, as homogeneous catalysts, not only show high catalytic activity and selectivity regardless of substrate size during the CO2 cycloaddition reaction, but also can be easily recovered from the reaction media through separating products and co-catalysts by one-step work-up. This is because that these MOCs have varied solubilities in different solvents due to the tunable packing of MOCs in the solid state. Moreover, the entire catalytic reaction system is very clean, and the purity of cyclic carbonates is as high as 97% without further purification. This work provides a unique strategy for developing novel supramolecular catalysts that can be used for homogeneous catalysis and recycled in a heterogeneous manner.
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Affiliation(s)
- Liang Kan
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
| | - Lei Zhang
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
| | - Long-Zhang Dong
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
| | - Xiao-Han Wang
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
| | - Run-Han Li
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
| | - Chenxing Guo
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518055, P. R. China
| | - Xiaopeng Li
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518055, P. R. China
| | - Yong Yan
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
| | - Shun-Li Li
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
| | - Ya-Qian Lan
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
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Kan L, Huang Y, Liu Z. WITHDRAWN: JUN and ATF3 are deficient in prostate cancer patients and their delivery in vivo via lipid nanoparticles has therapeutic efficacy by enhancing immune surveillance. Pharmacol Res 2023; 194:106753. [PMID: 37011775 DOI: 10.1016/j.phrs.2023.106753] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Revised: 03/03/2023] [Accepted: 03/31/2023] [Indexed: 04/03/2023]
Abstract
This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at https://www.elsevier.com/about/policies/article-withdrawal.
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Affiliation(s)
- Liang Kan
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, 110004, Liaoning, PR China
| | - Yongye Huang
- College of Life and Health Sciences, Northeastern University, Shenyang, 110169, Liaoning, PR China
| | - Zhongyuan Liu
- Department of Urology, Shengjing Hospital of China Medical University, Shenyang, 110004, Liaoning, PR China.
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Kan L, Yang M, Zhang H. Long noncoding RNA PSMA3-AS1 functions as a competing endogenous RNA to promote gastric cancer progression by regulating the miR-329-3p/ALDOA axis. Biol Direct 2023; 18:36. [PMID: 37403106 PMCID: PMC10318671 DOI: 10.1186/s13062-023-00392-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 02/04/2023] [Accepted: 06/22/2023] [Indexed: 07/06/2023] Open
Abstract
LncRNA PSMA3-AS1 functions as an oncogene in several cancers, including ovarian cancer, lung cancer, and colorectal cancer. However, its role in gastric cancer (GC) progression remains unclear. In this study, the levels of PSMA3-AS1, miR-329-3p, and aldolase A (ALDOA) in 20 paired human GC tissues and adjacent nontumorous tissues were measured by real-time PCR. GC cells were transfected with recombinant plasmid carrying full-length PSMA3-AS1 or shRNA targeting PSMA3-AS1. The stable transfectants were selected by G418. Then, the effects of PSMA3-AS1 knockdown or overexpression on GC progression in vitro and in vivo were evaluated. The results showed that PSMA3-AS1 was highly expressed in human GC tissues. Stable knockdown of PSMA3-AS1 significantly restrained proliferation/migration/invasion, enhanced cell apoptosis, and induced oxidative stress in vitro. Tumor growth and matrix metalloproteinase expression in tumor tissues were markedly inhibited, while oxidative stress was enhanced in nude mice after stable PSMA3-AS1 knockdown. Additionally, PSMA3-AS1 negatively regulated miR-329-3p while positively regulated ALDOA expression. MiR-329-3p directly targeted ALDOA-3'UTR. Interestingly, miR-329-3p knockdown or ALDOA overexpression partially attenuated the tumor-suppressive effects of PSMA3-AS1 knockdown. Conversely, PSMA3-AS1 overexpression exhibited the opposite effects. PSMA3-AS1 promoted GC progression by regulating the miR-329-3p/ALDOA axis. PSMA3-AS1 might serve as a promising and effective target for GC treatment.
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Affiliation(s)
- Liang Kan
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, 110004, China
| | - Meiqi Yang
- Department of Endoscopy, The First Affiliated Hospital of China Medical University, 155 North Nanjing Street, Shenyang, 110001, China
| | - Huijing Zhang
- Department of Endoscopy, The First Affiliated Hospital of China Medical University, 155 North Nanjing Street, Shenyang, 110001, China.
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Yu X, Li X, Kan L, Pan P, Wang X, Liu W, Zhang J. Double network microcrystalline cellulose hydrogels with high mechanical strength and biocompatibility for cartilage tissue engineering scaffold. Int J Biol Macromol 2023; 238:124113. [PMID: 36963545 DOI: 10.1016/j.ijbiomac.2023.124113] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [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: 01/27/2023] [Revised: 03/15/2023] [Accepted: 03/17/2023] [Indexed: 03/26/2023]
Abstract
Cartilage tissue regeneration is tremendously tough, it has become a major clinical challenge for the orthopedic medical community. Because of their bionic structure, high water content, biocompatibility, and biodegradability, hydrogels derived from natural polysaccharide are excellent candidates for cartilage tissue engineering. However, these materials often face problems such as poor mechanical strength and excessive swelling, which limit their clinical application. This study used a chemical-physical multi-step cross-linking strategy to create double-network (DN) microcrystalline cellulose (MCC) hydrogels. The hydrogels' intrinsic biomimetic macroporous shape and high water content made them ideal for chondrocyte adhesion and proliferation. The performance requirements for cartilage tissue engineering scaffolds are met by DN hydrogels, which have a sufficiently high compressive strength (4.53 MPa), superior compression recovery, and fatigue resistance, compared to single-network (SN) hydrogels. According to in vitro findings, DN hydrogels could boost cell adhesion and proliferation due to their safe and non-toxic nature. Hydrogels were demonstrated to be stable over the long-term performance, to degrade slowly, and to have strong histocompatibility by in vivo implantation. To construct cartilage tissue engineering scaffold and conduct three-dimensional cell culture, DN hydrogels have significant potential.
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Affiliation(s)
- Xinding Yu
- School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, Liaoning, PR China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, PR China
| | - Xi Li
- Department of Sports Medicine and Joint Surgery, The People's Hospital of Liaoning Province, The People's Hospital of China Medical University, Shenyang 110067, Liaoning, PR China
| | - Liang Kan
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang 110004, Liaoning, PR China
| | - Peng Pan
- School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, Liaoning, PR China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, PR China
| | - Xi Wang
- Department of Emergency and Oral Medicine, School and Hospital of Stomatology, China Medical University, Shenyang 110002, Liaoning, PR China
| | - Wentao Liu
- School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, Liaoning, PR China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, PR China.
| | - Jinsong Zhang
- School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, Liaoning, PR China; Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, PR China.
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Xu T, Zhang P, Cui F, Li J, Kan L, Tang B, Zou X, Liu Y, Zhu G. Fine-Tuned Ultra-Microporous Metal-Organic Framework in Mixed-Matrix Membrane: Pore-Tailoring Optimization for C 2 H 2 /C 2 H 4 Separation. Adv Mater 2023; 35:e2204553. [PMID: 36573630 DOI: 10.1002/adma.202204553] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 10/27/2022] [Indexed: 06/18/2023]
Abstract
Effective separation of ethyne from ethyne/ethylene (C2 H2 /C2 H4 ) mixtures is a challenging and crucial industrial process. Herein, an ultra-microporous metal-organic framework (MOF) platform, Cd(dicarboxylate)2 (ditriazole), with triangular channels is proposed for high-efficiency separation of C2 H2 from C2 H4 . The targeted structures are constructed via a mixed-ligand strategy by selecting different-sized ligands, allowing for tunable pore sizes and volumes. The pore properties can be further optimized by additional modification via pore environment tailoring. This concept leads to the successful synthesis of three ultra-microporous Cd-MOFs (JLU-MOF87-89). As intended, C2 H2 uptake and C2 H2 /C2 H4 selectivity gradually increase with progressively optimizing the pore structure by adjusting ligand length and substituents. JLU-MOF89, functionalized with methyl groups, features the most optimal pore chemistry and shows selective recognition of C2 H2 over C2 H4 , owing to the framework-C2 H2 host-guest interactions. Furthermore, JLU-MOFs are fabricated into mixed-matrix membranes for C2 H2 /C2 H4 separation. C2 H2 permeability and C2 H2 /C2 H4 permselectivity are substantially enhanced by ≥400% and ≥200%, respectively, after hybridization of JLU-MOF88 and JLU-MOF89 with a polyimide polymer (6FDA-ODA). These membranes can work efficiently and are stable under different conditions, demonstrating their potential in actual ethyne separation.
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Affiliation(s)
- Tong Xu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Panpan Zhang
- Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
| | - Fengchao Cui
- Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
| | - Jiantang Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Liang Kan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Baobing Tang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Xiaoqin Zou
- Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
| | - Yunling Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, P. R. China
| | - Guangshan Zhu
- Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China
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Zhou J, Li J, Kan L, Zhang L, Huang Q, Yan Y, Chen Y, Liu J, Li SL, Lan YQ. Linking oxidative and reductive clusters to prepare crystalline porous catalysts for photocatalytic CO 2 reduction with H 2O. Nat Commun 2022; 13:4681. [PMID: 35948601 PMCID: PMC9365760 DOI: 10.1038/s41467-022-32449-z] [Citation(s) in RCA: 66] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 07/28/2022] [Indexed: 12/25/2022] Open
Abstract
Mimicking natural photosynthesis to convert CO2 with H2O into value-added fuels achieving overall reaction is a promising way to reduce the atmospheric CO2 level. Casting the catalyst of two or more catalytic sites with rapid electron transfer and interaction may be an effective strategy for coupling photocatalytic CO2 reduction and H2O oxidation. Herein, based on the MOF ∪ COF collaboration, we have carefully designed and synthesized a crystalline hetero-metallic cluster catalyst denoted MCOF-Ti6Cu3 with spatial separation and functional cooperation between oxidative and reductive clusters. It utilizes dynamic covalent bonds between clusters to promote photo-induced charge separation and transfer efficiency, to drive both the photocatalytic oxidative and reductive reactions. MCOF-Ti6Cu3 exhibits fine activity in the conversion of CO2 with water into HCOOH (169.8 μmol g−1h−1). Remarkably, experiments and theoretical calculations reveal that photo-excited electrons are transferred from Ti to Cu, indicating that the Cu cluster is the catalytic reduction center. A crystalline hetero-metallic cluster catalyst based on a covalent organic framework strategy is reported. The catalyst can facilitate both photocatalytic oxidative and reductive reactions leading to efficient production of HCOOH from CO2 and H2O.
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Affiliation(s)
- Jie Zhou
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China
| | - Jie Li
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China
| | - Liang Kan
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China
| | - Lei Zhang
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China
| | - Qing Huang
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China
| | - Yong Yan
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China.
| | - Yifa Chen
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China
| | - Jiang Liu
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China
| | - Shun-Li Li
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China
| | - Ya-Qian Lan
- School of Chemistry, South China Normal University, Guangzhou, 510006, P.R. China.
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Fu N, Jiang M, Li F, Guo P, Hou C, Wu M, Wu J, Wang Z, Kan L. Assessment of ZTD Derived from COSMIC Occultation Data with ECWMF, Radiosondes, and GNSS. Sensors (Basel) 2022; 22:5209. [PMID: 35890887 PMCID: PMC9319514 DOI: 10.3390/s22145209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 07/02/2022] [Accepted: 07/09/2022] [Indexed: 06/15/2023]
Abstract
Global Navigation Satellite System (GNSS) signals generate slant tropospheric delays when they pass through the atmosphere, which is recognized as the main source of error in many spatial geodetic applications. The zenith tropospheric delay (ZTD) derived from radio occultation data is of great significance to atmospheric research and meteorology and needs to be assessed in the use of precision positioning. Based on the atmPrf, sonPrf, and echPrf data from the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) Data Analysis and Archiving Center (CDAAC) from 1 January to 31 December 2008 and 2012, we obtained the ZTDs of the radio occultation data (occZTD) and the corresponding radiosonde (sonZTD) and ECWMF data (echZTD). The ZTDs derived from ground-based global positioning system (GPS) observations from the International GNSS Service (IGS) were corrected to the lowest tangent point height of the matched radio occultation profile by the barometric height formula (gnsZTD). The statistical results show that the absolute values of the bias between occZTD and echZTD, sonZTD, or gnsZTD are less than 5 mm, and the standard deviations are approximately 20 mm or less, indicating that occZTD had significant accuracy in the GNSS positioning model even when the local spherical symmetry assumption error was introduced when the Abel inversion algorithm was used to obtain the refractive index profile of atmPrf. The effects of the horizontal/vertical matching resolution and the variation in the station height/latitude on the biases of occZTD and gnsZTD were analyzed. The results can be used to quantify the performance of radio occultation data for tropospheric delay error correction in dynamic high-precision positioning.
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Affiliation(s)
- Naifeng Fu
- School of Marine Science and Technology, Tianjin University, Tianjin 300072, China;
| | - Mingbo Jiang
- Beijing Institute of Applied Meteorology, Beijing 100029, China;
| | - Fenghui Li
- School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China; (C.H.); (Z.W.); (L.K.)
| | - Peng Guo
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China; (P.G.); (M.W.); (J.W.)
| | - Chunping Hou
- School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China; (C.H.); (Z.W.); (L.K.)
| | - Mengjie Wu
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China; (P.G.); (M.W.); (J.W.)
| | - Jianming Wu
- Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China; (P.G.); (M.W.); (J.W.)
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhipeng Wang
- School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China; (C.H.); (Z.W.); (L.K.)
| | - Liang Kan
- School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China; (C.H.); (Z.W.); (L.K.)
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Chang L, Kan L. Mesenchymal Stem Cell-Originated Exosomal Circular RNA circFBXW7 Attenuates Cell Proliferation, Migration and Inflammation of Fibroblast-Like Synoviocytes by Targeting miR-216a-3p/HDAC4 in Rheumatoid Arthritis. J Inflamm Res 2021; 14:6157-6171. [PMID: 34853524 PMCID: PMC8627898 DOI: 10.2147/jir.s336099] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [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: 08/25/2021] [Accepted: 11/06/2021] [Indexed: 12/11/2022] Open
Abstract
Background Rheumatoid arthritis (RA) is a chronic autoimmune disease of articular joint damage and elevated synovial hyperplasia. Abnormal proliferation, invasion inflammatory response of rheumatoid fibroblast-like synoviocytes (RA-FLS) play a critical role in RA progression. Mesenchymal stem cell (MSC)–derived exosomal circular RNAs are promising therapeutic manner for disease treatment. This work aimed to decipher the role of exosomal circFBXW7 in RA. Methods The expression of circFBXW7, miR-216a-3p, and HDAC4 were detected in clinical RA samples. The RA rat model was established. Isolation and identification of exosomes from MSCs was conducted. The effects of exosomal circFBXW7 on RA was evaluated by qPCR, CCK-8, transwell assays, flow cytometry, Western blotting, ELISA, and immunohistochemical assay. Interaction between miR-216a-3p and circFBXW7 or HDAC4 was determined by luciferase reporter gene assay and RNA pulldown. Results Exosomal circFBXW7 treatment suppressed proliferation, migration and inflammatory response of RA-FLSs and damage of RA model. CircFBXW7 could directly sponge miR-216a-3p to upregulate the expression of HDAC4. Inhibition of HDAC4 or upregulation of miR-216a-3p abolished the therapeutic function of exosomal circFBXW7. Our data demonstrated that circFBXW7 and HDAC4 were decreased, and miR-216a-3p was elevated in clinical RA sample compared with healthy samples. Conclusion We concluded that MSC-derived exosomal circFBXW7 suppressed proliferation, migration and inflammatory response of RA-FLSs and damage of RA rats via sponging miR-216a-3p and release the activation of HDAC4. These findings may provide a novel therapeutic target for RA.
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Affiliation(s)
- Lihua Chang
- Department of Rheumatology and Immunology, Shengjing Hospital of China Medical University, Shenyang, Liaoning Province, People's Republic of China
| | - Liang Kan
- Department of Gerontology and Geriatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning Province, People's Republic of China
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Gong Z, Kan L. Segmentation and classification of renal tumors based on convolutional neural network. Journal of Radiation Research and Applied Sciences 2021. [DOI: 10.1080/16878507.2021.1984150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Zheng Gong
- Department of Urinary Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Liang Kan
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
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Wang R, Song Y, Hu T, Wang X, Jiang Y, Zhang D, Yu J, Han S, Kan L. Decreased CD8 + Lymphocytic Infiltration in Multifocal and Multicentric Glioblastomas. Front Oncol 2021; 11:748277. [PMID: 34646781 PMCID: PMC8503598 DOI: 10.3389/fonc.2021.748277] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 07/27/2021] [Accepted: 09/10/2021] [Indexed: 11/25/2022] Open
Abstract
Purpose Multifocal and multicentric glioblastomas (mGBMs) are associated with a poorer prognosis compared to unifocal glioblastoma (uGBM). The presence of CD8+ tumor-infiltrating lymphocytes (TILs) is predictive of clinical outcomes in human malignancies. Here, we examined the CD8+ lymphocytic infiltration in mGBMs. Methods The clinical data of 57 consecutive IDH wildtype primary mGBM patients with histopathological diagnoses were retrospectively reviewed. CD8+ TILs were quantitatively evaluated by immunohistochemical staining. The survival function of CD8+ TILs was assessed by Kaplan–Meier analysis and Cox proportional hazard models. Results No significant difference in the concentration of CD8+ TILs was observed among foci from the same patient (P>0.150). The presence of CD8+ TILs was similar between multifocal and multicentric GBMs (P=0.885). The concentration of CD8+ TILs was significantly lower in mGBMs than in uGBMs (P=0.002). In mGBM patients, the CD8+ TIL level was associated with preoperative KPS (P=0.018). The median overall survival (OS) of the 57 mGBMs was 9 months. A low CD8+ TIL level (multivariate HR 4.404, 95% CI 1.954-9.926, P=0.0004) was an independent predictor of poor OS, while postoperative temozolomide chemotherapy (multivariate HR 6.076, 95% CI 2.330-15.842, P=0.0002) was independently associated with prolonged OS in mGBMs. Conclusions Decreased CD8+ TIL levels potentially correlate with unfavorable clinical outcome in mGBMs, suggesting an influence of the local immuno-microenvironment on the progression of mGBMs.
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Affiliation(s)
- Run Wang
- Department of Neurosurgery, The First Hospital of China Medical University, Shenyang, China.,Department of Neurosurgery, Huazhong University of Science and Technology Union Shenzhen Hospital (Nanshan Hospital), Shenzhen, China
| | - Yifu Song
- Department of Neurosurgery, The First Hospital of China Medical University, Shenyang, China
| | - Tianhao Hu
- Department of Neurosurgery, The First Hospital of China Medical University, Shenyang, China
| | - Xiaoliang Wang
- Department of Neurosurgery, The First Hospital of China Medical University, Shenyang, China
| | - Yang Jiang
- Department of Neurosurgery, The First Hospital of China Medical University, Shenyang, China.,Department of Neurosurgery, Shanghai First People's Hospital of Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Di Zhang
- Department of Pathology, China Medical University, Shenyang, China
| | - Juanhan Yu
- Department of Pathology, China Medical University, Shenyang, China
| | - Sheng Han
- Department of Neurosurgery, The First Hospital of China Medical University, Shenyang, China
| | - Liang Kan
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
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Gu J, Sun X, Kan L, Qiao J, Li G, Liu Y. Structural Regulation and Light Hydrocarbon Adsorption/Separation of Three Zirconium-Organic Frameworks Based on Different V-Shaped Ligands. ACS Appl Mater Interfaces 2021; 13:41680-41687. [PMID: 34433263 DOI: 10.1021/acsami.1c11224] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
On the basis of different V-shaped ligands, three zirconium-organic frameworks (JLU-Liu45, Zr-SDBA, and Zr-OBBA) have been successfully constructed. By regulating spatial configuration and functional groups of organic ligands, these as-synthesized Zr-MOFs (MOF = metal-organic framework) display distinct structures and different light hydrocarbon adsorption/separation capabilities. JLU-Liu45, with a double-walled interpenetrated 3D primitive cubic (pcu) framework, exhibits good gas-adsorption capacity but not prominent selective separation ability. Through regulating sizes and torsion angles of the organic ligands, Zr-SDBA possesses a 2D square lattice (sql) network, while Zr-OBBA displays a non-interpenetrated 3D pcu framework. Furthermore, by regulating functional groups on the ligands, Zr-SDBA shows prominent C2H2 uptake (101.2 cm3·g-1) and the best C2H2/CH4 selectivity (230.5, 1:1) among the three Zr-MOFs, and Zr-OBBA shows a significant C3H8/CH4 selectivity (105.6, 1:1). This work demonstrates the feasibility of structural regulation for MOF materials in the light hydrocarbon adsorption/separation field.
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Affiliation(s)
- Jiaming Gu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Xiaodong Sun
- Institute of Clean Energy Chemistry, Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, College of Chemistry, Liaoning University, Shenyang 110036, P. R. China
| | - Liang Kan
- School of Chemistry, South China Normal University, Guangzhou 510006, P. R. China
| | - Junyi Qiao
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Guanghua Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Yunling Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
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Li J, Kan L, Li J, Liu Y, Eddaoudi M. Quest for Zeolite‐like Supramolecular Assemblies: Self‐Assembly of Metal–Organic Squares via Directed Hydrogen Bonding. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202006978] [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] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jiantang Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
- Functional Materials Design, Discovery & Development (FMD3) Advanced Membranes & Porous Materials Center Division of Physical Sciences and Engineering 4700 King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Kingdom of Saudi Arabia
| | - Liang Kan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Jiyang Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Yunling Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Mohamed Eddaoudi
- Functional Materials Design, Discovery & Development (FMD3) Advanced Membranes & Porous Materials Center Division of Physical Sciences and Engineering 4700 King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Kingdom of Saudi Arabia
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Li J, Kan L, Li J, Liu Y, Eddaoudi M. Quest for Zeolite‐like Supramolecular Assemblies: Self‐Assembly of Metal–Organic Squares via Directed Hydrogen Bonding. Angew Chem Int Ed Engl 2020; 59:19659-19662. [DOI: 10.1002/anie.202006978] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 06/16/2020] [Indexed: 11/08/2022]
Affiliation(s)
- Jiantang Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
- Functional Materials Design, Discovery & Development (FMD3) Advanced Membranes & Porous Materials Center Division of Physical Sciences and Engineering 4700 King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Kingdom of Saudi Arabia
| | - Liang Kan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Jiyang Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Yunling Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of Chemistry Jilin University Changchun 130012 P. R. China
| | - Mohamed Eddaoudi
- Functional Materials Design, Discovery & Development (FMD3) Advanced Membranes & Porous Materials Center Division of Physical Sciences and Engineering 4700 King Abdullah University of Science and Technology (KAUST) Thuwal 23955-6900 Kingdom of Saudi Arabia
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Kan L, Li G, Liu Y. Highly Selective Separation of C 3H 8 and C 2H 2 from CH 4 within Two Water-Stable Zn 5 Cluster-Based Metal-Organic Frameworks. ACS Appl Mater Interfaces 2020; 12:18642-18649. [PMID: 32227837 DOI: 10.1021/acsami.0c04538] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Adopting the mixed ligands approach, two water-stable Zn5 cluster-based MOFs, [Zn10(TZ)12(TADIPA)2(DMF)4]·DMF·6H2O (JLU-MOF66) and [Zn10(TZ)12(TPTA)2(DMA)2]·2DMA·4H2O (JLU-MOF67), have been constructed (H4TADIPA = 5,5'-(1H-1,2,4-triazole-3,5-diyl)diisophthalic acid, H4TPTA = [1,1':3',1″-terphenyl]-3,3″,5,5″-tetracarboxylic acid, and HTZ = 1H-[1,2,3]triazole). Both compounds with [Zn5(TZ)6] clusters exhibit extraordinary stability (pH = 2-11) and selectivity of C3H8/CH4 (308 for JLU-MOF66, and 287 for JLU-MOF67). Compared to JLU-MOF67, JLU-MOF66 with functional groups exhibits higher CO2 and C2H2 uptake capacity and excellent selective separation for C2H2/CH4 (86, 1:1). Such high separation and chemical stability render them as promising materials for industrial applications.
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Affiliation(s)
- Liang Kan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Guanghua Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Yunling Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
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Kan L, Li L, Li G, Zhang L, Liu Y. Three stable dinuclear [M2(OH)0.5(NO3)0.5(RCOO)2(RN)4] (M = Cu, Ni) based metal–organic frameworks with high CO2 adsorption and selective separation for O2/N2 and C3H8/CH4. Inorg Chem Front 2020. [DOI: 10.1039/c9qi01220f] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Three isostructural and stable MOFs have been constructed. All the three compounds with high-density OMSs exhibit high performances for CO2 capture and selective separation.
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Affiliation(s)
- Liang Kan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Lan Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Guanghua Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Lirong Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Yunling Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
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Zhou Y, Kan L, Eubank JF, Li G, Zhang L, Liu Y. Self-assembly of two robust 3D supramolecular organic frameworks from a geometrically non-planar molecule for high gas selectivity performance. Chem Sci 2019; 10:6565-6571. [PMID: 31367308 PMCID: PMC6615216 DOI: 10.1039/c9sc00290a] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [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: 01/18/2019] [Accepted: 05/27/2019] [Indexed: 02/03/2023] Open
Abstract
Two 3D SOFs were synthesized based on a ‘direction-oriented’ strategy. The unique and permanent porosity structures exhibit remarkable ability to separate CO2 from N2 and light hydrocarbons.
The synthesis of highly porous frameworks has received continuous research interest, but achieving the ability to target stable and selective materials remains challenging. Herein, by utilizing a ‘direction-oriented’ strategy and modulating reaction conditions, two novel 3D porous supramolecular organic framework (SOF) materials (JLU-SOF2 and JLU-SOF3, as isomers) are assembled from a non-planar building block (TMBTI = 2,4,6-trimethyl benzene-1,3,5-triyl-isophthalic acid) and they display permanent porosity, high thermal stability, and good recyclability. It is worth mentioning that the CO2 uptake values of JLU-SOF2 and JLU-SOF3 rank among the highest values for SOF-based materials under ambient conditions. Furthermore, these two materials exhibit preferential adsorption of CO2 over N2 and CH4, and can effectively separate the mixtures of light hydrocarbons. These studies indicate the possible application of JLU-SOF2 and JLU-SOF3 in trapping greenhouse gases and upgrading natural gas. In addition, this synthetic strategy introduces an effective method for developing remarkable 3D SOFs among other framework materials.
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Affiliation(s)
- Yue Zhou
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China . ; ; Tel: +86-431-85168614
| | - Liang Kan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China . ; ; Tel: +86-431-85168614
| | - Jarrod F Eubank
- Florida Southern College , 111 Lake Hollingsworth Dr , Lakeland , FL , USA 33801
| | - Guanghua Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China . ; ; Tel: +86-431-85168614
| | - Lirong Zhang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China . ; ; Tel: +86-431-85168614
| | - Yunling Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry , College of Chemistry , Jilin University , Changchun 130012 , P. R. China . ; ; Tel: +86-431-85168614
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Jia M, Li J, Che S, Kan L, Li G, Liu Y. Two CuxIy-based copper–organic frameworks with multiple secondary building units (SBUs): structure, gas adsorption and impressive ability of I2 sorption and release. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00233b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Two CuxIy-based copper–organic frameworks with multiple SBUs have been successfully synthesized. Both the compounds exhibit high performance for I2 sorption and release.
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Affiliation(s)
- Mingwei Jia
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Jiantang Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Songtian Che
- Department of Ocular Fundus Disease of the Second Clinical Hospital
- Jilin University
- Changchun 130022
- P. R. China
| | - Liang Kan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Guanghua Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Yunling Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
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Kan L, Cai J, Jin Z, Li G, Liu Y, Xu L. Two Stable Zn-Cluster-Based Metal–Organic Frameworks with Breathing Behavior: Synthesis, Structure, and Adsorption Properties. Inorg Chem 2018; 58:391-396. [DOI: 10.1021/acs.inorgchem.8b02507] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Liang Kan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Jun Cai
- Beijing Institute of Applied Meteorology, Beijing 100029, P. R. China
| | - Zhuwei Jin
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Guanghua Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Yunling Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Liren Xu
- Beijing Institute of Applied Meteorology, Beijing 100029, P. R. China
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Zhang Y, Xu X, Zhang M, Wang X, Bai X, Li H, Kan L, Zhou Y, Niu H, He P. MicroRNA-663a is downregulated in non-small cell lung cancer and inhibits proliferation and invasion by targeting JunD. BMC Cancer 2016; 16:315. [PMID: 27184257 PMCID: PMC4869303 DOI: 10.1186/s12885-016-2350-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [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: 02/21/2015] [Accepted: 05/11/2016] [Indexed: 12/31/2022] Open
Abstract
Background MicroRNA-663a expression is downregulated in several tumors. However, its functions and mechanisms in human non-small cell lung (NSCLC) cancer remain obscure. The present study aimed to identify the expression pattern, biological roles and potential mechanisms by which miR-663a dysregulation is associated with NSCLC. Methods We examined expression level of miR-663a in 62 cases of NSCLC tissues and 5 NSCLC cell lines by reverse transcription PCR. In vitro, gain-of-function and loss-of-function experiments were performed to examine the impact of miR-663a on proliferation, cell cycle progression and invasion of NSCLC cells. Using fluorescence reporter assays, we also explored the potential targets and possible mechanisms of miR-663a in NSCLC cells. Results Downregulation of miR-663a was observed in 42 of 62 of lung cancer tissues compared with paired normal tissues (mean cancer/normal value = 0.745) and its downregulation correlated with nodal metastasis. Transfection of miR-663a mimic suppressed cell proliferation, cell cycle progression and invasion, with downregulation of cyclin D1, cyclin E and MMP9 in both H460 and H1299 cell lines. Transfection of miR-663a inhibitor in both H460 and H1299 cell lines exhibited the opposite effects. In addition, we confirmed that miR-663a could inhibit AP-1 activity and AP-1 component JunD was a direct target of miR-663a in lung cancer cells. Transfection of miR-663a mimic downregulated JunD expression. In addition, JunD siRNA treatment abrogated miR-663a inhibitor-induced expression of cyclin D1, cyclin E and MMP9. Above all, both miRNA mimic and inhibitor in two different NSCLC cell lines demonstrated that miR-663a inhibits proliferation and invasion by targeting AP-1 transcription factor JunD. Conclusions This study indicates that miR-663a downregulation might be associated with NSCLC progression. MiR-663a suppresses proliferation and invasion by targeting AP-1 component JunD in NSCLC cells. Electronic supplementary material The online version of this article (doi:10.1186/s12885-016-2350-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yi Zhang
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China
| | - Xiaoman Xu
- Department of Respiratory Medicine, Shengjing Hospital of China Medical University, Shenyang, China
| | - Meng Zhang
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China
| | - Xin Wang
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China
| | - Xue Bai
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China
| | - Hui Li
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China
| | - Liang Kan
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China
| | - Yong Zhou
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China
| | - Huiyan Niu
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China
| | - Ping He
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China.
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Kan L, Zhang M, He P. [LRRC3B is Downregulated in Non-small Cell Lung Cancer and Connected with Cell Proliferation and Invasion]. Zhongguo Fei Ai Za Zhi 2016; 19:177-83. [PMID: 27118644 PMCID: PMC5999812 DOI: 10.3779/j.issn.1009-3419.2016.04.01] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
背景与目的 已有的研究表明:在许多恶性肿瘤细胞中,LRRC3B表达显著下调,被视为肿瘤抑制蛋白。然而,在非小细胞肺癌中它的表达模式和生物学作用缺乏研究。人类癌症微阵列的研究显示LRRC3B在乳腺癌和结肠直肠癌表达下调,提示LRRC3B参与致癌作用。本研究的目的是研究LRRC3B在非小细胞肺癌中的必到状态及其与肺癌增殖、侵袭和细胞周期间的相关性,探讨LRRC3B在调控肺癌细胞增殖、侵袭及细胞周期中的作用。 方法 应用Western blot和Realtime RT-PCR检测LRRC3B在几株肺癌细胞系中的mRNA和蛋白表达水平。应用MTT法检测对转染LRRC3B的A549和H460细胞系细胞增殖能力变化,应用集落形成实验以及细胞侵袭实验研究LRRC3B对细胞增殖和侵袭以及细胞周期进程的作用。肺癌细胞系H3255中转染LRRC3B siRAN验证LRRC3B对细胞的增殖以及侵袭能力和对细胞周期进程的影响。 结果 与正常NHBE细胞系相比,NSCLC细胞系中LRRC3B蛋白表达量显著下调,特别是H460、H358、HCC827以及A549。A549和H460细胞系转染LRRC3B后,细胞增殖和侵袭能力受到抑制。LRRC3B抑制细胞周期进程,并下调cyclin D1和MMP9的表达。H3255细胞中敲除LRRC3B,细胞增殖和侵袭能力显著增强,同时与细胞周期及侵袭能力相关的蛋白cyclin D1和MMP9表达略微上调。 结论 LRRC3B在肺癌细胞系中表达下调,而上调LRRC3B则能够抑制肺癌细胞增殖和侵袭能力,并抑制细胞周期进程,可能是未来肺癌治疗的一个新靶点。
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Affiliation(s)
- Liang Kan
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Meng Zhang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang 110004, China
| | - Ping He
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang 110004, China
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Kan L, Li H, Zhang Y, Wang J, Niu H, Jiang H, Zhang M, Bai X, He P. LRRC3B is downregulated in non-small-cell lung cancer and inhibits cancer cell proliferation and invasion. Tumour Biol 2015; 37:1113-20. [PMID: 26276358 DOI: 10.1007/s13277-015-3833-0] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Accepted: 07/21/2015] [Indexed: 01/06/2023] Open
Abstract
LRRC3B has emerged as a tumor suppressor in several human cancers. However, its expression pattern and biological roles in human non-small-cell lung cancer (NSCLC) have not been explored. In the present study, we investigated clinical significance of LRRC3B in 101 NSCLC specimens. We found that LRRC3B expression was downregulated in NSCLC tissues compared with normal bronchial epithelium and that its downregulation significantly correlated with tumor-node-metastasis (TNM) stage (p < 0.0001), nodal metastasis (p < 0.0001), and poor patient prognosis (p = 0.0016, log-rank test). We also checked LRRC3B levels in several lung cancer cell lines and found that its expression was downregulated in four of nine lung cancer cell lines compared with normal human bronchial epithelial (NHBE) cell line. We further explored the biological role of LRRC3B. LRRC3B plasmid transfection in H460 and A549 cell lines inhibited proliferation, colony formation ability, and invading ability. Furthermore, we identified that LRRC3B could inhibit cell cycle progression with downregulation of cyclin D1 and decreased MMP9 expression. In addition, LRRC3B depletion in HBE cells promoted proliferation and invasion. In conclusion, our data suggested that LRRC3B may serve as an important tumor suppressor in NSCLC.
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Affiliation(s)
- Liang Kan
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Hui Li
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Yi Zhang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Jiahe Wang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Huiyan Niu
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Hongfang Jiang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Meng Zhang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Xue Bai
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China
| | - Ping He
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China. .,Department of Geriatrics, Shengjing Hospital, 36 Sanhao Road, Shenyang, 110004, China.
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Zhang M, Bian ZG, Zhang Y, Wang JH, Kan L, Wang X, Niu HY, He P. Cucurbitacin B inhibits proliferation and induces apoptosis via STAT3 pathway inhibition in A549 lung cancer cells. Mol Med Rep 2014; 10:2905-11. [PMID: 25242136 PMCID: PMC4227420 DOI: 10.3892/mmr.2014.2581] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [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: 12/02/2013] [Accepted: 07/21/2014] [Indexed: 01/11/2023] Open
Abstract
Natural products are a great source of cancer chemotherapeutic agents. The present study was conducted to investigate whether cucurbitacin B (CuB), one of the most potent and widely used cucurbitacins, inhibits proliferation and induces apoptosis in the A549 lung cancer cell line. Furthermore, CuB induced apoptosis of A549 cells in a concentration-dependent manner, as determined by fluorescence microscopy, flow cytometry and transmission electron microscopy. The present study also demonstrated that CuB dose-dependently inhibited lung cancer cell proliferation, with cell cycle inhibition and cyclin B1 downregulation. Apoptosis induced by CuB was shown to be associated with cytochrome c release, B-cell lymphoma 2 downregulation and signal transducer and activator of transcription 3 pathway inhibition. CuB may prove to be a useful approach for the chemotherapy of lung cancer.
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Affiliation(s)
- Meng Zhang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Zhi-Gang Bian
- Department of Otolaryngology, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Yi Zhang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Jia-He Wang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Liang Kan
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Xin Wang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Hui-Yan Niu
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Ping He
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
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Zhang Y, Xu X, Zhang M, Bai X, Li H, Kan L, Niu H, He P. ARID1A is downregulated in non-small cell lung cancer and regulates cell proliferation and apoptosis. Tumour Biol 2014; 35:5701-7. [PMID: 24566899 DOI: 10.1007/s13277-014-1755-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 02/13/2014] [Indexed: 12/12/2022] Open
Abstract
ARID1A (AT-rich interactive domain 1A) is a key member of the SWI/SNF chromatin-modeling complex, and the gene has emerged as a tumor suppressor in various human cancers. In the present study, we investigated the expression and clinical significance of ARID1A in non-small cell lung cancer (NSCLC). We found that ARID1A expression was decreased in NSCLC tissues compared with normal bronchial epithelium and was significantly correlated with nodal metastasis, tumor, node, metastasis (TNM) stage, and poor differentiation. ARID1A expression was lower in lung cancer cell lines than normal bronchial epithelial HBE cell line. We also explored the involvement of ARID1A in biological behavior of lung cancer cell lines. ARID1A depletion by small interfering RNA (siRNA) in H460 and H1299 cell lines promoted proliferation, colony formation ability, and inhibited paclitaxel-induced apoptosis. Furthermore, we identified that ARID1A regulated several cell cycle and apoptosis-related targets such as cyclin D1 and Bcl-2. In addition, the activity of Akt phosphorylation was also enhanced after ARID1A depletion. In conclusion, our data suggested that ARID1A may serve as an important tumor suppressor in NSCLC.
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Affiliation(s)
- Yi Zhang
- Department of Geriatrics, Shengjing Hospital of China Medical University, 36 Sanhao Road, Shenyang, 110004, China
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Zhang Y, Xu XM, Zhang M, Qu D, Niu HY, Bai X, Kan L, He P. Effects of tubeimoside-1 on the proliferation and apoptosis of BGC823 gastric cancer cells in vitro. Oncol Lett 2013; 5:801-804. [PMID: 23425861 PMCID: PMC3576213 DOI: 10.3892/ol.2013.1117] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [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: 10/01/2012] [Accepted: 12/18/2012] [Indexed: 12/13/2022] Open
Abstract
Natural products isolated from Chinese medicinal herbs are useful sources of new drugs for cancer therapy. Tubeimoside-1 (TBMS1) is a natural compound isolated from the Chinese medicinal herb Bolbostemma paniculatum (Maxim.) Franquet (Cucurbitaceae). Studies have shown that TBMS1 has anticancer effects in various human cancer cell lines. However, the effect of TBMS1 on human gastric cancer cells is unknown. In the present study, it was observed that TBMS1 inhibited BGC823 gastric cancer cell proliferation in a concentration- and time-dependent manner. Fluorescent microscopy and flow cytometric analysis showed that TBMS1 induced BGC823 cell apoptosis in a concentration-dependent manner. Western blot analysis also showed that TBMS1 induced apoptosis by regulation of the Bcl-2 gene family in BGC823 cells. These findings indicate that TBMS1 may be developed as a possible therapeutic agent for the management of gastric cancer.
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Affiliation(s)
- Yi Zhang
- Departments of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
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Zhang Y, Zhang GB, Xu XM, Zhang M, Qu D, Niu HY, Bai X, Kan L, He P. Suppression of growth of A549 lung cancer cells by waltonitone and its mechanisms of action. Oncol Rep 2012; 28:1029-35. [PMID: 22710478 DOI: 10.3892/or.2012.1869] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Accepted: 05/28/2012] [Indexed: 11/06/2022] Open
Abstract
Natural compounds are a great source of cancer chemotherapeutic agents. Our investigation indicates that waltonitone, a triterpene extracted from medicinal plants, inhibits the proliferation of A549 cells in a concentration- and time-dependent manner. Waltonitone induced apoptosis of A549 cells in a concentration-dependent manner, as determined by fluorescence microscopy and flow cytometry. The apoptosis was accompanied by increased Bax protein levels and decreased Bcl-2 protein levels in A549 cells. Furthermore, the treatment of A549 cells with waltonitone altered the expression of miRNAs. We found that 27 miRNAs were differentially expressed in waltonitone-treated cells, of which 8 miRNAs target genes related to cell proliferation and apoptosis. In summary, our results demonstrate that waltonitone has a significant inhibitory effect on the proliferation of A549 cells. It is possible that upregulation of Bax/Bcl-2 and regulation of expression of specific miRNAs play a role in inhibition of proliferation and induction of apoptosis in waltonitone-treated cells. Waltonitone can be applied to lung carcinoma as a chemotherapeutic candidate.
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Affiliation(s)
- Yi Zhang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang 110004, PR China
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Wang JH, Zhou YJ, Zhang M, Kan L, He P. Active lipids of Ganoderma lucidum spores-induced apoptosis in human leukemia THP-1 cells via MAPK and PI3K pathways. J Ethnopharmacol 2012; 139:582-589. [PMID: 22172327 DOI: 10.1016/j.jep.2011.11.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Revised: 11/20/2011] [Accepted: 11/29/2011] [Indexed: 05/31/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Ganoderma lucidum (Lingzhi) is traditionally drug, which has been traditionally effective used in the treatment of chronic hepatopathy, hypertension, hyperglycemia and cancer. MATERIALS AND METHODS THP-1 and HL-60 apoptosis induced by active lipids of Ganoderma lucidum spores was quantified by flow cytometry using FITC-conjugated annexin V and PI; MAPK and Akt were measured by Western blot, and caspase-3, -8 and -9 activities were also detected by spectrophotometric assay. RESULTS Our results showed that active lipids of Ganoderma lucidum spores decreased phosphorylation-ERK1/2 (P-ERK1/2), P-Akt and increased P-JNK1/2, but did not affect expressions of P-p38 MAPK in THP-1 cells. Moreover, treatment of THP-1 cells with active lipids of Ganoderma lucidum spores resulted in activation of caspase-3, -8 and -9. Furthermore, LY294002 (Akt inhibitor) or PD98059 (ERK1/2 inhibitor) significantly enhanced active lipids of Ganoderma lucidum spores-induced apoptosis in THP-1 cells, whereas caspase inhibitors or SP600125 (JNK inhibitor), decreased apoptosis in THP-1 cells. CONCLUSION Taken together, our study for the first time suggests that active lipids of Ganoderma lucidum spores is able to enhance apoptosis in THP-1 cells, at least in part, through inhibition of ERK1/2, Akt and activation of JNK1/2 signaling pathways. Moreover, it also triggers caspase-3, -8 and -9 activation mediated apoptotic induction.
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Affiliation(s)
- Jia-He Wang
- Department of Geriatrics, Shengjing Hospital of China Medical University, Shenyang, China.
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Abstract
OBJECTIVES To determine the factors that influence risk of cervical cancer after three consecutive negative Pap smears. METHODS A cohort study was conducted using data from the British Columbia Cervical Cancer Screening Program and British Columbia Cancer Registry. Analysis was based on a one percent sample of women aged 20-69 years with Pap smears enriched with all invasive cervical cancer cases diagnosed between 1994-99. Screening intervals, after three negative screens, were created with the following variables: age at beginning of interval, interval length, previous cytologic abnormality and previous cervical procedure. The risk of cervical cancer by histologic type was calculated using survival analysis methods. RESULTS The sample consisted of 10,509 women, who contributed 28,309 intervals, and 371 cervical cancer cases. The incidence rate of invasive squamous cervical cancer increased with time since last screen up to six years. Women with a history of dysplasia remained at elevated risk for squamous cancer, hazard ratio=2.6 (95% confidence interval [CI]=1.9, 3.4) but age or previous procedure were not related to risk. No relationship between time since last screen and non-squamous cancer risk was found although history of a previous procedure was significant. The marginal effectiveness of Pap smears declined with increasing frequency of use. CONCLUSIONS This study confirmed the preventive effect of Pap smear screening and its dependency on frequency of use. Women with a history of dysplasia, prior to three consecutive negatives, were at increased risk of developing invasive squamous cervical cancer compared with women with no such history.
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Affiliation(s)
- A Coldman
- Division of Gynecologic Oncology, BC Cancer Agency,Vancouver, BC, Canada.
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Olivotto IA, Borugian MJ, Kan L, Harris SR, Rousseau EJ, Thorne SE, Vestrup JA, Wright CJ, Coldman AJ, Hislop TG. Improving the time to diagnosis after an abnormal screening mammogram. Can J Public Health 2001; 92:366-71. [PMID: 11702491 PMCID: PMC6979599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
INTRODUCTION Five community-specific interventions to reduce the time to diagnosis after an abnormal breast screen have been evaluated. METHODS Subjects with abnormal screening mammograms in 1998 were assessed through five community pilot projects (N = 1137) and a control random sample assessed elsewhere in BC (N = 1053). The number, types, dates and physician costs of breast-related interventions after an abnormal screen were compared between pilots and control. RESULTS The median time to diagnosis for women without a biopsy was reduced from 23 days to 7 days (p = 0.001) in the pilot with facilitated referral to diagnosis. The median time to diagnosis for women with a biopsy was reduced from 57 days to 22-43 days in the pilots. Median physician costs per subject were lower (p = 0.02) in pilots that more frequently used core biopsy to obtain a diagnosis. CONCLUSIONS Process changes can improve the time to diagnosis after an abnormal breast screen, with similar or lower physician costs per subject. Facilitating the referral process had the greatest impact.
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Affiliation(s)
- I A Olivotto
- Screening Mammography Program of British Columbia, Victoria, BC
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Olivotto IA, Bancej C, Goel V, Snider J, McAuley RG, Irvine B, Kan L, Mirsky D, Sabine MJ, McGilly R, Caines JS. Waiting times from abnormal breast screen to diagnosis in 7 Canadian provinces. CMAJ 2001; 165:277-83. [PMID: 11517642 PMCID: PMC81326] [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: 02/21/2023] Open
Abstract
BACKGROUND Delay to breast cancer diagnosis following an abnormal screening result is associated with anxiety and personal disruption. We assessed the patterns and timeliness of diagnostic follow-up after breast cancer screening for women with abnormal results who attended organized screening programs in 7 provinces. METHODS Using data from the Canadian Breast Cancer Screening Database, we identified 203,141 women aged 50-69 years who underwent screening in 1996 through provincially organized breast cancer screening programs in British Columbia, Alberta, Saskatchewan, Manitoba, Ontario, Nova Scotia and Newfoundland. We prospectively followed women with an abnormal screening result through to the completion of the assessment process. We evaluated the waiting times from screening examination to first assessment, from screening examination to first imaging, from screening examination to diagnosis and from first assessment to diagnosis for 13,958 women, stratified according to screening program, mode of detection, whether a biopsy was performed and whether cancer was diagnosed. RESULTS We observed considerable variations between and within programs in the time to diagnosis. The median time from screening examination to first assessment was 2.6 weeks. The median time from screening examination to diagnosis was 3.7 weeks; this time increased to 6.9 weeks for women undergoing biopsy. Even when no biopsy was performed, 10% of the women waited 9.6 weeks or longer for a diagnosis, as compared with 15.0 weeks or longer for 10% of the women undergoing biopsy. Among the women who had a biopsy, the use of core biopsy was associated with a shorter median time to diagnosis than was open biopsy, and those found to have cancer had shorter waiting times than women with benign biopsy findings. INTERPRETATION Women undergoing assessment of an abnormal breast cancer screening result waited many weeks for a diagnosis, especially when a biopsy was performed. To ensure that targets for timeliness, adopted nationally in 1999, are realized, improved models of care or dissemination of existing efficient techniques to reach a diagnosis will be needed.
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Affiliation(s)
- I A Olivotto
- Division of Radiation Oncology, University of British Columbia, Vancouver, BC
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Kaneko T, Okiji T, Kan L, Suda H, Takagi M. An immunoelectron-microscopic study of class II major histocompatibility complex molecule-expressing macrophages and dendritic cells in experimental rat periapical lesions. Arch Oral Biol 2001; 46:713-20. [PMID: 11389863 DOI: 10.1016/s0003-9969(01)00031-0] [Citation(s) in RCA: 11] [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: 11/16/2022]
Abstract
Previous studies have demonstrated that heterogeneous populations of class II major histocompatibility complex (MHC) molecule-expressing non-lymphoid cells, ultrastructurally classified as macrophages and dendritic cell (DC) cell-like cells, comprise the major immune cell population in experimental periapical lesions in rat molars. In this study, the temporal changes in relative proportions of the two types of cells were examined, on the hypothesis that they are involved in different aspects of the pathogenesis of the lesions. The lesions were induced by making surgical pulp exposures in mandibular first molars of 5-week-old Wistar rats. Observation periods were set at 0 (normal), 3, 14, 28, and 56 days. Non-lymphoid cells immunoreactive to OX6 (reactive to class II MHC molecules) were classified as macrophages and DC cell-like cells according to their ultrastructure, and the frequencies of the two types of cells were assessed at each time-point. ED1 (reactive to nearly all macrophages and DCs) was also used to identify macrophages and DC cell-like cells. At 3 days, most OX6+ cells and ED1+ cells in the periapical tissue had the ultrastructural appearance of newly recruited macrophages. At 14 days, when the lesion was actively expanding, there were significantly more OX6+ macrophages than OX6+ DC cell-like cells (P<0.01). However, at 28 days, when lesion expansion had ceased, DC cell-like cells significantly outnumbered OX6+ macrophages (P<0.01); this remained constant at 56 days. Cell-to-cell contact between OX6+ non-lymphoid cells and OX6- lymphocytes, suggesting a functional interaction, was most frequently seen at 28 days. These results support the notion that class II MHC molecule-expressing macrophages play some part in the initial lesion expansion, and suggest that DC cell-like cells may primarily be involved in immune defence against perpetuated antigenic challenges following lesion stabilization.
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Affiliation(s)
- T Kaneko
- Pulp Biology and Endodontics, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, 5-45 Yushima-1-chome, Bunkyo-ku, 113-8549, Tokyo, Japan.
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Abstract
The phenotypic distribution and density of macrophage-associated antigen-expressing cells in the periodontal ligament (PDL) of normal rat mandibular first molars was evaluated by immunohistochemistry, and an attempt made to identify dendritic cells (DCs) by immunoelectron microscopy. Cells immunopositive to ED1 (a general macrophage marker) were widely distributed throughout the PDL and were most common around blood vessels. A small number of T lymphocytes and OX62 (anti-veiled cells and gammadelta T cells)-positive DC-like cells were also found. The relative density of cells immunopositive to ED9 (CD14), OX42 (CD11b), OX6 (anti-class II MHC molecules), ED2 (anti-tissue-resident macrophages), 8A2 (CD11c) and WT.1 (CD11a) varied in the mesial, distal and periapical regions of the distal root and the furcal region. This finding suggests that there are several subpopulations of ED1-positive cells which express various combinations of these markers. Immunoelectron microscopy revealed that a small, but distinct, subpopulation of ED1- and OX6-positive cells did have a DC-like ultrastructure, although the majority of these cells were identified as macrophages. The DC-like cells were characterized by poorly developed lysosomal structures and an absence of phagocytic vesicles. It was concluded that the normal rat PDL is equipped with heterogeneous populations of macrophages with regional variations in density. The DC-like cells may function as antigen-presenting cells.
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Affiliation(s)
- L Kan
- Pulp Biology and Endodontics, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, 5-45, Yushima 1-chome, Bunkyo-ku, 113-8549, Tokyo, Japan
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Kaneko T, Okiji T, Kan L, Takagi M, Suda H. Ultrastructural analysis of MHC class II molecule-expressing cells in experimentally induced periapical lesions in the rat. J Endod 2001; 27:337-42. [PMID: 11485252 DOI: 10.1097/00004770-200105000-00007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [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: 11/26/2022]
Abstract
Periapical lesions were induced by making 28 days of unsealed pulp exposures in the lower first molars of Wistar rats. Major histocompatibility complex class II molecule-expressing cells were then demonstrated by means of immunoperoxidase staining using a monoclonal antibody OX6, and the ultrastructure of these cells was analyzed under electron microscopy. OX6+ cells were classified into two major populations, (i.e. macrophages and dendritic cell (DC)-like cells. DC-like cells had elongated cytoplasmic processes, contained a few lysosomal structures, lacked distinct phagosomes, and were the most predominant cell type in the established lesion. Some of lymphocytes and plasma cells also showed a positive immunoreactivity. Both OX6+ macrophages and DC-like cells often showed a cell-to-cell attachment with lymphocytes. These findings suggested that major histocompatibility complex class 11 molecule-expressing macrophages and DC-like cells may play a crucial role in periapical lesion development by acting as antigen-presenting cells to memory T lymphocytes.
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Affiliation(s)
- T Kaneko
- Department of Restorative Science, Graduate School, Tokyo Medical and Dental University, Japan
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Fox DA, He X, Abe A, Hollander T, Li LL, Kan L, Friedman AW, Shimizu Y, Shayman JA, Kozarsky K. The T lymphocyte structure CD60 contains a sialylated carbohydrate epitope that is expressed on both gangliosides and glycoproteins. Immunol Invest 2001; 30:67-85. [PMID: 11465673 DOI: 10.1081/imm-100104017] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [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: 11/03/2022]
Abstract
The CD60 antigen is expressed on a majority of T cells in autoimmune lesions, and anti-CD60 can activate T lymphocytes. CD60 has been defined as the GD3 ganglioside, and subsequently as the 9-O-acetylated form of GD3. However, other evidence suggests that anti-CD60 recognizes a glycoprotein or family of glycoproteins expressed by T lymphocytes. The current studies were undertaken to better define the identity of the CD60 antigen on both T cells and non-T cells. Treatment of intact cells with neuraminidases of various specificities confirmed that detection of the CD60 epitope depends on expression of an alpha2, 8-disialic acid carbohydrate linkage, as is found in GD3 and related gangliosides. However, the sialicacid polymer colominic acid inhibited anti-GD2 and anti-GD3, but not anti-CD60 from binding to cell surfaces. Expression of CD60 did not correlate with expression of GD3 on a variety of cell lines and T cell populations. Expression of CD60 and 9-O-acetyl-GD3 was roughly parallel on some non-T cell lines such as melanoma cells, but on T cells expression of CD60 was consistently greater. Antibodies to GD2, GD3 and 9-O-acetyl-GD3 were ineffective at inhibiting binding of anti-CD60 to CD60+ cells. Activation responses of T cells to anti-CD60 were inducible in either the presence or absence of a response to anti-GD3. A novel inhibitor of glucosyl ceramide synthesis, D-threo-1-phenyl-2-palmitoylamino-3-pyrrolidino-1-propanol (D-t-P4) reduced expression of GD3 much more than CD60 on activated T lymphocytes. Following biotinylation of HUT78 T cells, anti-CD60 immunoprecipitated a 70 kDa antigen. Taken together, the present data and previous findings suggest that anti-CD60 can recognize both a modified form of the GD3 ganglioside and a carbohydrate-dependent complex epitope present on one or more glycoproteins. This glycoprotein epitope may be the more abundant and functionally significant CD60 antigen on T lymphocytes, while 9-O-acetyl-GD3 is likely to be the principal structure recognized by anti-CD60 on melanoma cells. These findings emphasize the complexity of understanding the functional roles of carbohydrate epitopes in cell activation.
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MESH Headings
- Antigens, CD/chemistry
- Antigens, CD/immunology
- Antigens, CD/metabolism
- Antigens, Differentiation, T-Lymphocyte/chemistry
- Antigens, Differentiation, T-Lymphocyte/immunology
- Antigens, Differentiation, T-Lymphocyte/metabolism
- Carbohydrate Sequence
- E-Selectin/metabolism
- Epitopes, B-Lymphocyte/chemistry
- Epitopes, B-Lymphocyte/immunology
- Epitopes, B-Lymphocyte/metabolism
- Gangliosides/chemistry
- Gangliosides/immunology
- Gangliosides/metabolism
- Glucosylceramides/antagonists & inhibitors
- Glycoproteins/chemistry
- Glycoproteins/immunology
- Humans
- Jurkat Cells
- Molecular Sequence Data
- N-Acetylneuraminic Acid/chemistry
- N-Acetylneuraminic Acid/immunology
- N-Acetylneuraminic Acid/metabolism
- Propanolamines/pharmacology
- Pyrrolidines/pharmacology
- T-Lymphocytes/immunology
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Affiliation(s)
- D A Fox
- Division of Rheumatology, Multipurpose Arthritis and Musculoskeletal Diseases Center, University of Michigan Medical School, Ann Arbor 48109, USA
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Abstract
Titin is a family of giant elastic proteins that constitute an elastic sarcomere matrix in striated muscle. In the I-band region of the sarcomere, where titin extends and develops passive force upon stretch, titin is composed of tandem repeats of approximately 100 residue immunoglobin domains and approximately 28-residue PEVK modules. We have performed 2D NMR and circular dichroism (CD) studies of the conformations of one representative 28-mer PEVK module from human fetal titin (PEPPKEVVPEKKAPVAPPKKPEVPPVKV). NMR data of synthetic peptides of this module as well as three constituent peptides of 9 to 12 residues in aqueous solutions reveal distinguishing features for left-handed three-residue per turn PPII helices: the lack of NOE NN(i, i+1), very large NOE alphaN(i, i+1)/NN(i, i+1), no medium range NOE alphaN(i, i+2), and dihedral angles phi and psi values of -78 and 146, respectively. Structural determinations indicate the presence of three short stretches of PPII helices of 4, 5, and 6 residues that are interposed with an unordered, and presumably flexible, spacer region to give one "polyproline II helix-coil" or "PhC" motif for roughly every 10 residues. These peptides also display the characteristic PPII CD spectra: positive peak or negative shoulder band at 223 nm, negative CD band near 200 nm, and biphasic thermal titration curves that reflect varied stability of these PPII helices. We propose that this PhC motif is a fundamental feature and that the number, length, stability, and distribution of PPII is important in the understanding of the elasticity and protein interactions of the PEVK region of titin.
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Affiliation(s)
- K Ma
- Laboratory of Physical Biology, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA
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Olivotto IA, Kan L, d'Yachkova Y, Burhenne LJ, Hayes M, Hislop TG, Worth AJ, Basco VE, King S. Ten years of breast screening in the Screening Mammography Program of British Columbia, 1988-97. J Med Screen 2001; 7:152-9. [PMID: 11126165 DOI: 10.1136/jms.7.3.152] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [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: 11/03/2022]
Abstract
OBJECTIVES To evaluate 10 years outcomes of the Screening Mammography Program of British Columbia (SMPBC) and determine if breast screening targets were being achieved among women aged 40-80+ years. SETTING Organised breast screening programme in British Columbia, Canada. METHODS Rates of participation, abnormal referral, cancer detection, and interval cancer were calculated for asymptomatic women receiving an SMPBC mammography from 1988-97. RESULTS 895,849 screening mammographies were provided to 335,433 women. 51.3% of women were age 50-69 years. Abnormalities were identified on 57,454 screens (6.4%) from which 3304 cancers were detected. Abnormal call rates were higher on first (9.8%), compared with subsequent screens (4.4%) and declined with age: 7.7% at age < 40 to 5.4% for age 70-79 years. Cancer detection rates were higher on first (5.0 per 1000) compared with subsequent screens (2.8 per 1000) and increased smoothly with age from 1.4 to 8.2 per 1000 from age < 40 to age 80 years and older. Twenty per cent of cancers were non-invasive. The median size of invasive cancers was 14 mm and 81% had no axillary lymph node metastases. The 12 month interval cancer rate was 0.6 per 1000 and did not vary significantly with age or screening history. The prevalence to expected incidence ratio was 3.1 for women age 50-79 years. CONCLUSION Across a broad range of ages, surrogate indices of screening mammography success have been achieved in a population based, North American, organised breast cancer screening programme.
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Affiliation(s)
- I A Olivotto
- Screening Mammography Program of British Columbia (BC), 8th Floor, 686 West Broadway, Vancouver, BC, Canada V5Z 1G1.
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Zhu Y, Kan L, Qi C, Kanwar YS, Yeldandi AV, Rao MS, Reddy JK. Isolation and characterization of peroxisome proliferator-activated receptor (PPAR) interacting protein (PRIP) as a coactivator for PPAR. J Biol Chem 2000; 275:13510-6. [PMID: 10788465 DOI: 10.1074/jbc.275.18.13510] [Citation(s) in RCA: 153] [Impact Index Per Article: 6.4] [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: 11/06/2022] Open
Abstract
We previously isolated and identified steroid receptor coactivator-1 (SRC-1) and peroxisome proliferator-activated receptor (PPAR)-binding protein (PBP/PPARBP) as coactivators for PPAR, using the ligand-binding domain of PPARgamma as bait in a yeast two-hybrid screening. As part of our continuing effort to identify cofactors that influence the transcriptional activity of PPARs, we now report the isolation of a novel coactivator from mouse, designated PRIP (peroxisome proliferator-activated receptor interacting protein), a nuclear protein with 2068 amino acids and encoded by 13 exons. Northern analysis showed that PRIP mRNA is ubiquitously expressed in many tissues of adult mice. PRIP contains two LXXLL signature motifs. The amino-terminal LXXLL motif (amino acid position 892 to 896) of PRIP was found to be necessary for nuclear receptor interaction, but the second LXXLL motif (amino acid position 1496 to 1500) appeared unable to bind PPARgamma. Deletion of the last 12 amino acids from the carboxyl terminus of PPARgamma resulted in the abolition of the interaction between PRIP and PPARgamma. PRIP also binds to PPARalpha, RARalpha, RXRalpha, ER, and TRbeta1, and this binding is increased in the presence of specific ligands. PRIP acts as a strong coactivator for PPARgamma in the yeast and also potentiates the transcriptional activities of PPARgamma and RXRalpha in mammalian cells. A truncated form of PRIP (amino acids 786-1132) acts as a dominant-negative repressor, suggesting that PRIP is a genuine coactivator.
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Affiliation(s)
- Y Zhu
- Department of Pathology, Northwestern University Medical School, Chicago, Illinois 60611, USA
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Kan L, Olivotto IA, Warren Burhenne LJ, Sickles EA, Coldman AJ. Standardized abnormal interpretation and cancer detection ratios to assess reading volume and reader performance in a breast screening program. Radiology 2000; 215:563-7. [PMID: 10796940 DOI: 10.1148/radiology.215.2.r00ma42563] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.4] [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: 11/11/2022]
Abstract
PURPOSE To determine the relationship between annual screening volume and radiologist performance in the Screening Mammography Program of British Columbia, Canada. MATERIALS AND METHODS Standardized abnormal interpretation ratios and standardized cancer detection ratios were constructed for 35 readers with at least 3 years of experience with the Screening Mammography Program of British Columbia. The ratios were used to compare individual reader performance with the mean program performance after adjustment for the age and screening history (first versus subsequent screening examinations) of the women who underwent screening. RESULTS The mean standardized abnormal interpretation ratio was better for readers of 2,000-2,999 (n = 8) and 3,000-3,999 (n = 9) screening mammograms per year than for those of less than 2,000 (n = 9) and 4, 000-5,199 (n = 9) screening mammograms per year. Differences in the mean standardized abnormal interpretation ratios were significant (P <.05) between the readers of less than 2,000 and of 2,000-2,999 screening mammograms per year, between readers of less than 2,000 and of 3,000-3,999 screening mammograms per year and between readers of 3,000-3,999 and of 4,000-5,199 screening mammograms per year. The mean standardized cancer detection ratio improved gradually with increasing annual volume, but the differences between groups were not statistically significant. Five of the eight readers of 2,000-2, 999 mammograms were reading 2,475 or more screening mammograms per year. CONCLUSION Standardized abnormal interpretation ratios and standardized cancer detection ratios provide a method of comparing two important performance measures in a screening program. A minimum of 2,500 interpretations per year is associated with lower abnormal interpretation rates and average or better cancer detection rates.
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Affiliation(s)
- L Kan
- Screening Mammography Program of British Columbia, 8th Fl, 686 W Broadway, Vancouver, British Columbia, Canada V5Z 1G1
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Olivotto IA, Kan L, King S. Waiting for a diagnosis after an abnormal screening mammogram. SMPBC diagnostic process workgroup. Screening Mammography Program of British Columbia. Can J Public Health 2000; 91:113-7. [PMID: 10832174 PMCID: PMC6979627] [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] [Received: 05/06/1999] [Accepted: 10/08/1999] [Indexed: 02/16/2023]
Abstract
BACKGROUND Women with abnormal screening mammograms require diagnostic assessment and experience anxiety until a diagnosis is established. This report evaluated the timeliness of diagnosis after an abnormal screening mammogram in the Screening Mammography Program of British Columbia (SMPBC). METHODS Information on diagnostic interventions following an abnormal screen (N = 10,314) provided through 11 regional SMPBC services between January 1, 1993 and June 30, 1994 were abstracted and analyzed. RESULTS The median time from abnormal screen to diagnosis was 3.4 weeks with regional variation of 2.0 to 4.7 weeks; 10% waited 8.7 weeks or longer. For the 19% of women proceeding to open biopsy, the median diagnostic interval was 7.1 weeks with regional variation of 4.6 to 9.3 weeks; 10% waited 13.1 weeks or longer. INTERPRETATION After an abnormal screening mammogram, women waited many weeks for a definitive diagnosis, especially those proceeding to open biopsy. Opportunities for process improvement were identified.
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Abstract
OBJECTIVE To assess the spectrum of diagnoses, the use of CT scans of the brain, and pharmacological treatments in patients presenting to a pediatric emergency department with headaches as the chief complaint. METHODS A 1-year retrospective chart review of all children who presented to the emergency department with a headache as the chief complaint. RESULTS One hundred thirty patients (0.7% of all pediatric emergency department visits, mean age = 9.3 years) were included in the study. Primary headaches included 11 migraine (8.5%) and 2 tension headaches (1.5%). Most of the secondary nonneurological headaches were associated with viral and respiratory illnesses (n=37, 28.5%), while the majority of the secondary neurological headaches included 26 posttraumatic (20%), 15 possible ventriculoperitoneal shunt malfunctions (11.5%), and 3 cases of aseptic meningitis (2.3%). The neurological etiology in 9 of these children (6.9%) was found to be serious (subdural hematoma, epidural hematoma, proven ventriculoperitoneal shunt malfunction, brain abscess, pseudotumor cerebri, and aseptic meningitis). Fifteen patients could not be etiologically classified, either because no specific etiology was found or their discharge diagnoses could not clearly explain the headache. Approximately 10% (5/53) of the CT scans of the head that were performed showed new abnormal findings including hydrocephalus secondary to ventriculoperitoneal shunt malfunction (2), subdural hematoma (1), epidural hematoma (1), and skull fracture (1). Forty-two patients (32%) were treated pharmacologically. Thirty-nine of the 42 treated patients (93%) were given over-the-counter analgesics, and 9 (21%) were given prescribed analgesics. CONCLUSIONS The majority of the headaches in the pediatric emergency department were secondary to concurrent illness and minor head trauma, and required no pharmacological treatment or only treatment with minor analgesics. In a small minority of patients, headaches were secondary to serious neurological conditions, which required immediate medical attention. Computed tomography scans showed new abnormalities in a minority of patients and should be reserved for those with neurological diagnoses such as head trauma and ventriculoperitoneal shunt, as well as for those patients with recent onset of headaches with no clear etiological explanation, and for those with high-risk medical conditions, such as hypocoagulabilities. Future prospective studies are needed to assess the efficacy of the various pharmacological treatments in this population.
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Affiliation(s)
- L Kan
- Division of Pediatric Neurology, Schneider Children's Hospital, Long Island Jewish Medical Center, The Long Island Campus for the Albert Einstein College of Medicine, New Hyde Park, NY 11040, USA
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Newman J, Peat TS, Richard R, Kan L, Swanson PE, Affholter JA, Holmes IH, Schindler JF, Unkefer CJ, Terwilliger TC. Haloalkane dehalogenases: structure of a Rhodococcus enzyme. Biochemistry 1999; 38:16105-14. [PMID: 10587433 DOI: 10.1021/bi9913855] [Citation(s) in RCA: 130] [Impact Index Per Article: 5.2] [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: 11/29/2022]
Abstract
The hydrolytic haloalkane dehalogenases are promising bioremediation and biocatalytic agents. Two general classes of dehalogenases have been reported from Xanthobacter and Rhodococcus. While these enzymes share 30% amino acid sequence identity, they have significantly different substrate specificities and halide-binding properties. We report the 1.5 A resolution crystal structure of the Rhodococcus dehalogenase at pH 5.5, pH 7.0, and pH 5.5 in the presence of NaI. The Rhodococcus and Xanthobacter enzymes have significant structural homology in the alpha/beta hydrolase core, but differ considerably in the cap domain. Consistent with its broad specificity for primary, secondary, and cyclic haloalkanes, the Rhodococcus enzyme has a substantially larger active site cavity. Significantly, the Rhodococcus dehalogenase has a different catalytic triad topology than the Xanthobacter enzyme. In the Xanthobacter dehalogenase, the third carboxylate functionality in the triad is provided by D260, which is positioned on the loop between beta7 and the penultimate helix. The carboxylate functionality in the Rhodococcus catalytic triad is donated from E141. A model of the enzyme cocrystallized with sodium iodide shows two iodide binding sites; one that defines the normal substrate and product-binding site and a second within the active site region. In the substrate and product complexes, the halogen binds to the Xanthobacter enzyme via hydrogen bonds with the N(eta)H of both W125 and W175. The Rhodococcusenzyme does not have a tryptophan analogous to W175. Instead, bound halide is stabilized with hydrogen bonds to the N(eta)H of W118 and to N(delta)H of N52. It appears that when cocrystallized with NaI the Rhodococcus enzyme has a rare stable S-I covalent bond to S(gamma) of C187.
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Affiliation(s)
- J Newman
- Life Sciences Division, Los Alamos National Laboratory, New Mexico.
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Olivotto IA, Mates D, Kan L, Fung J, Samant R, Burhenne LJ. Prognosis, treatment, and recurrence of breast cancer for women attending or not attending the Screening Mammography Program of British Columbia. Breast Cancer Res Treat 1999; 54:73-81. [PMID: 10369083 DOI: 10.1023/a:1006152918283] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [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: 11/12/2022]
Abstract
Breast cancer screening programs have been initiated in many countries in the past decade. To determine the impact of the Screening Mammography Program of British Columbia (SMPBC), disease and treatment outcomes for women with breast cancer diagnosed in BC between 1989 and 1996 were compared on the basis of attendance at the SMPBC. An SMPBC attender was a women diagnosed with breast cancer within three years of an SMPBC screen, regardless whether the cancer was detected as a result of that screen. Of the 13,636 women aged 40-89 years diagnosed with breast cancer in BC during the study period, 2,647 (19.4%) were SMPBC attenders. 73.5% of SMPBC attenders (N = 1,946) and 74.2% of non-attenders (N = 8,149) were referred to the BC Cancer Agency and had pathology, staging, treatment, and outcome information available. SMPBC attenders compared with non-attenders were more likely to have in situ disease alone, and those with invasive cancers had smaller tumors which were less likely to have grade III histology and less likely to have spread to axillary lymph nodes (all P < 0.001). SMPBC attenders were more likely to be treated with breast conservation and less likely to receive adjuvant chemotherapy or tamoxifen (P < 0.001). Log-rank tests showed local (P = 0.017), distant (P < 0.001), and overall (P < 0.001) disease-free survival were better for SMPBC attenders. These favorable surrogate endpoints suggest that the benefits of breast screening as demonstrated by randomized trials can be translated into community practice by an organized breast screening program.
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Affiliation(s)
- I A Olivotto
- The Screening Mammography Program of British Columbia, British Columbia Cancer Agency, The University of British Columbia, Vancouver, Canada.
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Olivotto IA, Kan L, Mates D, King S. Screening Mammography Program of British Columbia: pattern of use and health care system costs. CMAJ 1999; 160:337-41. [PMID: 10065075 PMCID: PMC1230035] [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: 02/11/2023] Open
Abstract
BACKGROUND The use of mammography for screening asymptomatic women has increased dramatically in the past decade. This report describes the changes that have occurred in the use of bilateral mammography in British Columbia since the provincial breast cancer screening program began in 1988. METHODS Using province-wide databases from both the breast cancer screening program and the provincial health insurance plan in BC, the authors determined the number and costs of bilateral mammography services for women aged 40 years or older between Apr. 1, 1986, and Mar. 31, 1997. Unilateral mammography was excluded because it is used for investigating symptomatic disease and screening abnormalities, and for follow-up of women who have undergone mastectomy for cancer. RESULTS As the provincial breast cancer screening program expanded from 1 site in 1988 to 23 in 1997, it provided an increasing proportion of the bilateral mammographic examinations carried out each year in BC. In fiscal year 1996/97, 65% of bilateral mammographic examinations were performed through the screening program. The cost per examination within the screening program dropped as volume increased. Thirty percent more bilateral mammography examinations were done in 1996/97 than in 1991/92, but health care system expenditures for these services increased by only 4% during the same period. In calendar year 1996, 21% of new breast cancers were diagnosed as a result of a screening program visit. INTERPRETATION Substantial increases in health care expenditures have been avoided by shifting bilateral mammography services to the provincial screening program, which has a lower cost per screening visit.
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Affiliation(s)
- I A Olivotto
- Screening Mammography Program of British Columbia, Vancouver.
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Abstract
Purified colicin E7 was analyzed by CD spectrum and gel filtration chromatography in a mimicking membrane-translocation phase. It was found that the CD spectra of colicin E7 at pH 7 and pH 2.5 were similar. Although the melting temperature of the protein shifted from 54.5 degrees C to 34 degrees C at low pH, the thermal denaturation curves of colicin E7 at different pH conditions still fit a two-state model. These experimental results imply that a minor structural change, triggered by acidic pH, for instance, may reduce the energy required for protein melting. In contrast to the minor change in secondary structure at different pH conditions, we observed that, in vitro, all monomeric colicin E7s converted into multimer-like conformations after recovering from the partial unfolding process. This multimeric form of colicin can only be dissociated by formamide and guanidine hydrochloride, indicating that this protein complex is indeed formed by aggregation of the monomeric colicins. Most interestingly, the aggregated colicins still perform in vivo bacteriocidal activity. We suggest that in a partial unfolding state the colicin is prepared for binding to the specific targets for translocation through the membrane. However, in the absence of specific targets in vitro these unfold intermediates may therefore aggregate into the multimeric form of colicins.
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Affiliation(s)
- K F Chak
- Institute of Biochemistry, National Yang Ming University, Taipei, Taiwan, ROC.
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Abstract
Pseudotumor cerebri is an unusual presentation of Lyme disease. The case of an 8-year-old girl with pseudotumor cerebri secondary to acute neuroborreliosis is reported. She presented with acute onset of headache, papilledema, sixth nerve palsy, increased intracranial pressure, and cerebrospinal fluid pleocytosis. Serum and cerebrospinal fluid Lyme antibodies were positive. Twelve reported cases that mostly presented with systemic findings and signs of Lyme disease before development of pseudotumor cerebri were reviewed. We conclude that acute neuroborreliosis can present with pseudotumor cerebri as an initial manifestation. It is important to include Lyme disease in the differential diagnosis of pseudotumor cerebri in an area endemic for Lyme disease.
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Affiliation(s)
- L Kan
- Division of Pediatric Neurology, Schneider Children's Hospital, Long Island Jewish Medical Center, Long Island Campus for the Albert Einstein College of Medicine, New Hyde Park, New York 11040, USA
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Hislop TG, Worth AJ, Kan L, Rousseau E. Post screen-detected breast cancer within the Screening Mammography Program of British Columbia. Breast Cancer Res Treat 1997; 42:235-42. [PMID: 9065607 DOI: 10.1023/a:1005793707549] [Citation(s) in RCA: 12] [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: 02/03/2023]
Abstract
The histological characteristics and extent of mammographic density were compared between 170 post screen-detected (PSD) breast cancers and 466 screen-detected (SD) breast cancers in women attending the Screening Mammography Program of British Columbia. In addition, methods of detection and clinical presentation for the PSD cancers were examined. Invasive ductal, comedo, and medullary carcinoma were significantly more common in PSD cancer in women under age 50 years, and invasive ductal carcinoma in women over age 50 years. Mammographic density was more common in PSD cancers for all age groups under 70 years. The majority of PSD cancers were node negative with no evidence of metastases; however, they tended to be of more advanced stage than SD cancer. Most PSD cancers regardless of age were initially found by the woman herself, presenting as a palpable mass, and the likelihood of being detected within 12 months of the last screening mammogram was higher at younger ages.
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Affiliation(s)
- T G Hislop
- Division of Epidemiology and Cancer Prevention, BC Cancer Agency, Vancouver, Canada
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Johnson MM, Hislop TG, Kan L, Coldman AJ, Lai A. Compliance with the screening mammography program of British Columbia: will she return? Can J Public Health 1996; 87:176-80. [PMID: 8771920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To identify factors associated with compliance in the Screening Mammography Program of British Columbia (SMPBC). METHOD Factors associated with rescreening within 18 months (annual compliers) and between 18 to 36 months later (late compliers) were identified in a cohort of SMPBC screenees using a self-administered questionnaire. RESULTS Fewer than half of women initially screened within the SMPBC were annual compliers, nearly 40% not returning by 3 years. In women age 50+ years, annual compliers tended to have no prior mammography, no prior breast pain, a physician referral to SMPBC, and a normal initial SMPBC mammogram. Late compliers also tended to have no prior mammography, a physician referral, and a normal initial SMPBC mammogram. CONCLUSIONS Several modifiable factors associated with compliance were identified: a physician referral to the program and possibly subsequent referral back to the program after workup for an abnormal mammogram.
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Affiliation(s)
- M M Johnson
- Research Advisory Council, King Faisal Specialist Hospital and Research Centre, Riyadh, Kingdom of Saudi Arabia
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Fang Y, Bai C, Wei Y, Lin SB, Kan L. Effect of selective cytosine methylation and hydration on the conformations of DNA triple helices containing a TTTT loop structure by FT-IR spectroscopy. J Biomol Struct Dyn 1995; 13:471-82. [PMID: 8825727 DOI: 10.1080/07391102.1995.10508857] [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: 02/02/2023]
Abstract
5-Methylcytosines have been introduced into triplex-forming-oligonucleotides and shown to extend the pH range over which a triplex forms with a homopurine-homopyrimidine tract of duplex DNA. As a host strand, an oligodeoxypyrimidine with a base sequence of 5'-d(TC)3T4(CT)3 ([CC]) was designed to form a hairpin triplex with a 5'-d-A(GA)2G ([AG6]) purine strand at acidic pH (Tsay, et al., (1995) J. Biomol. Str. Dyn., 13, 1235-1245). We here present results obtained by FT-IR spectroscopy concerning the conformation of the hairpin triplex as a function of the selective substitution of cytosines by 5-methylcytosines in the host strand. Namely, cytosines are substituted by 5-methylcytosines in either the 3'-pyrimidine portion ([CM]) or the 5'-pyrimidine portion ([MC]) or in both ([MM]) of the host strand. The acidic-induced transitions of the equimolar mixtures of the purine target with either of the four pyrimidine oligomers gives rise to different apparent pK values, i.e., [MM].[AG6] (6.2) > [MC].[AG6] (6.0) > [CM].[AG6] (5.7) > [CC].[AG6] (5.2) > single-stranded oligopyrimidines (4.6 +/- 0.2), indicating that cytosine methylation expands the pH range compatible with the hairpin triplex formation regardless of whether the substitution is in the 5'-pyrimidine (Hoogsteen) portion or in the 3'-pyrimidine (Watson-Crick) portion. Thermal denaturation profiles indicated that all the triplexes denatured in a monophasic manner in the pH range of 4.0 to 7.0, and that cytosine methylations in any position of the 16-base pyrimidine oligomer increase the stability of the hairpin triplex DNA. IR spectra recorded in D2O and H2O solutions revealed that cytosine methylation does not significantly influence the conformation of triplex DNA in solution, i.e., all the four triplexes accept a similar sugar conformation, and predominately take on a S-type sugar pucker with a relative proportion of two S-type sugars for one N-type. Furthermore, we also investigated the effect of relative humidity (RH) on the conformation of triplex MC.AG6 in hydrated films, and found that the conformational change induced by the decrease of RH, from predominant S-type to primary N-type sugar pucker, might first occur in the purine strand at 86% RH.
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Affiliation(s)
- Y Fang
- Institute of Chemistry, Academia Sinica, Beijing, China
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Abstract
PURPOSE To demonstrate the ability of a mass mammography screening program to provide consistently high-quality mammography screening, while at the same time sustain a large volume of patients to keep the cost of mammography low. MATERIALS AND METHODS A public-funded, mass mammography screening program, begun in 1988, is currently being conducted in five Canadian provinces. For the Screening Mammography Program of British Columbia, complete follow-up data are available for the first 57 months of operation. During that time, the program expanded from one center with five radiologist screeners to 14 centers with 30 radiologist screeners. There were 201,937 examinations performed on 128,325 women, 35% of whom were younger than 50 years. RESULTS There were 802 cancers detected at an overall rate of 6.2 per 1,000 women (2.8 per 1,000 in women younger than 50 years and 8.1 per 1,000 in women older than 50 years). In the women younger than 50 years, 90 (72%) of the cancers were stage 0 or stage I, and the axillary lymph nodes were involved in 14 (11%). In the women 50 years or older, 496 (73%) of the cancers were stage 0 or stage 1, and the axillary lymph nodes were involved in 97 (14%). CONCLUSION If quality is carefully controlled, the results of a mass screening program can be either maintained or improved. For both age groups, the prognostic characteristics are similar.
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Affiliation(s)
- L J Burhenne
- Department of Radiology, University of British Columbia, Vancouver General Hospital, Canada
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Kochelaev BI, Kan L, Elschner B, Elschner S. Spin dynamics in La2-xSrxCuO4+ delta doped with Mn as revealed by an ESR study. Phys Rev B Condens Matter 1994; 49:13106-13118. [PMID: 10010225 DOI: 10.1103/physrevb.49.13106] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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