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Tost M, Andler O, Kazmaier U. A Matteson Homologation‐Based Synthesis of Doliculide and Derivatives. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101345] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Markus Tost
- Organic Chemistry Saarland University P.O. Box 151150 66041 Saarbrücken Germany
| | - Oliver Andler
- Organic Chemistry Saarland University P.O. Box 151150 66041 Saarbrücken Germany
| | - Uli Kazmaier
- Organic Chemistry Saarland University P.O. Box 151150 66041 Saarbrücken Germany
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Yang K, Luo M, Li H, Abdulrehman G, Kang L. Effects of jasplakinolide on cytotoxicity, cytoskeleton and apoptosis in two different colon cancer cell lines treated with m-THPC-PDT. Photodiagnosis Photodyn Ther 2021; 35:102425. [PMID: 34214686 DOI: 10.1016/j.pdpdt.2021.102425] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 04/25/2021] [Accepted: 06/25/2021] [Indexed: 12/28/2022]
Abstract
Colorectal cancer (CRC) is a common malignant tumor, and metastasis is one of the most important challenges in the treatment of CRC. Photodynamic therapy (PDT) is a novel and non-invasive treatment that influence cytoskeleton and to reduce cancer metastases. In addition, cytoskeleton is related to cancer metastases. Two isogenic colorectal cancer cell lines SW480 and SW620 were used in the present study, we found that m-THPC mediated PDT changed the cytotoxicity, apoptosis and cytoskeleton in both cell lines. Interestingly, the expression of intermediate filaments protein cytokeratin18 were different in the two cell lines. In order to further confirm the relationship between cytoskeleton and cell migration, we combined with microfilament stabilizer jasplakinolide (JASP) to observe the effects of microfilaments on cell migration, cytotoxicity and apoptosis. Taken together, these findings suggest that m-THPC-PDT could induce cytoplasmic cytoskeleton destruction in both types of cells, especially on microfilaments and microtubules. Moreover, in SW480 cells, microtubules may participate in the apoptosis process induced by m-THPC-PDT, while microfilaments may participate in the process of m-THPC-PDT inhibiting cell migration. But in SW620 cells, only microfilaments may be involved in m-THPC-PDT induced apoptosis and inhibition of cell migration.
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Affiliation(s)
- Kaizhen Yang
- Teaching & Research Department, The First People's Hospital of Urumqi, 1 Jiankang Road, Urumqi, Xinjiang Uygur Autonomous Region, China.
| | - Mengyu Luo
- School of Public Health, Xinjiang Medical University, 567 SHangde North Road, Urumqi, Xinjiang Uygur Autonomous Region, China.
| | - Hongxia Li
- School of Public Health, Xinjiang Medical University, 567 SHangde North Road, Urumqi, Xinjiang Uygur Autonomous Region, China.
| | - Gulinur Abdulrehman
- Cancer Hospital of The Third Affiliated Hospital of Xinjiang Medical University, 789 Suzhou East Road, Urumqi, Xinjiang Uygur Autonomous Region, China.
| | - Ling Kang
- School of Public Health, Xinjiang Medical University, 567 SHangde North Road, Urumqi, Xinjiang Uygur Autonomous Region, China.
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Zou JL, Sun JH, Qiu S, Chen SH, He FL, Li JC, Mao HQ, Liu XL, Quan DP, Zeng YS, Zhu QT. Spatial distribution affects the role of CSPGs in nerve regeneration via the actin filament-mediated pathway. Exp Neurol 2018; 307:37-44. [PMID: 29852179 DOI: 10.1016/j.expneurol.2018.05.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 05/24/2018] [Accepted: 05/27/2018] [Indexed: 11/28/2022]
Abstract
CSPGs are components of the extracellular matrix in the nervous system, where they serve as cues for axon guidance during development. After a peripheral nerve injury, CSPGs switch roles and become axon inhibitors and become diffusely distributed at the injury site. To investigate whether the spatial distribution of CSPGs affects their role, we combined in vitro DRG cultures with CSPG stripe or coverage assays to simulate the effect of a patterned substrate or dispersive distribution of CSPGs on growing neurites. We observed neurite steering at linear CSPG interfaces and neurite inhibition when diffused CSPGs covered the distal but not the proximal segment of the neurite. The repellent and inhibitory effects of CSPGs on neurite outgrowth were associated with the disappearance of focal actin filaments on growth cones. The application of an actin polymerization inducer, jasplakinolide, allowed neurites to break through the CSPG boundary and grow on CSPG-coated surfaces. The results of our study collectively reveal a novel mechanism that explains how the spatial distribution of CSPGs determines whether they act as a cue for axon guidance or as an axon-inhibiting factor. Increasing our understanding of this issue may promote the development of novel therapeutic strategies that regulate the spatial distributions of CSPGs to use them as an axon guidance cue.
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Affiliation(s)
- Jian-Long Zou
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, No. 58, Zhongshan 2nd Road, Guangzhou 510080, China
| | - Jia-Hui Sun
- Key Laboratory for Stem Cells and Tissue Engineering, Sun Yat-sen University, Ministry of Education, Guangzhou, Guangdong 510080, China
| | - Shuai Qiu
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, No. 58, Zhongshan 2nd Road, Guangzhou 510080, China
| | - Shi-Hao Chen
- PCFM Lab, GD HPPC Lab, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510127, China
| | - Fu-Lin He
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, No. 58, Zhongshan 2nd Road, Guangzhou 510080, China
| | - Jia-Chun Li
- Orthopedics Department, The Third Affiliated Hospital, Sun Yat-sen University, 600 Tianhe Road, Guangzhou, Guangdong 510630, China
| | - Hai-Quan Mao
- Institute for NanoBioTechnology, Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
| | - Xiao-Lin Liu
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, No. 58, Zhongshan 2nd Road, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue-engineering and Technology Research Center, Guangzhou 510080, China
| | - Da-Ping Quan
- PCFM Lab, GD HPPC Lab, School of Chemistry, Sun Yat-sen University, Guangzhou, Guangdong 510127, China
| | - Yuan-Shan Zeng
- Key Laboratory for Stem Cells and Tissue Engineering, Sun Yat-sen University, Ministry of Education, Guangzhou, Guangdong 510080, China
| | - Qing-Tang Zhu
- Department of Microsurgery, Orthopedic Trauma and Hand Surgery, The First Affiliated Hospital, Sun Yat-sen University, No. 58, Zhongshan 2nd Road, Guangzhou 510080, China; Guangdong Provincial Peripheral Nerve Tissue-engineering and Technology Research Center, Guangzhou 510080, China.
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Aida N, Ushikubo T, Kobayashi F, Sako R, Suehara M, Furusawa M, Muramatsu T. Actin stabilization induces apoptosis in cultured porcine epithelial cell rests of Malassez. Int Endod J 2015; 49:663-9. [PMID: 26118334 DOI: 10.1111/iej.12494] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 06/23/2015] [Indexed: 11/29/2022]
Abstract
AIM To test whether actin stabilization by jasplakinolide induces inhibition of cell viability and apoptosis in epithelial cell rests of Malassez (ERM). METHODOLOGY ERM derived from porcine were spread in a 96-well dish (5 × 10(4) /well) using Dulbecco's modified Eagle's medium. The actin-specific stabilization reagent, jasplakinolide, was incorporated into the culture medium and incubated for 24 h. To evaluate cell viability, the WST-1 assay was carried out and absorption (450 nm) was measured. To detect apoptotic cells, monoclonal antibody to single-strand DNA (ssDNA) was used and absorption (405 nm) was measured. Actin stabilization and apoptosis induced by jasplakinolide were morphologically investigated by staining with Alexa Fluor 568 phalloidin and observed under a fluorescent microscope. As a negative control, DMSO was used instead of jasplakinolide. Differences between the jasplakinolide-treated group and the control group were analysed statistically using the Student's t-test. RESULTS Cell viability decreased in a concentration-dependent manner, and cell viability in the jasplakinolide-treated ERM was lower than that in nontreated ERM (n = 16, P < 0.01). Apoptotic cells in the jasplakinolide-treated ERM were more frequently detected compared to that in nontreated ERM (n = 16, P < 0.01). Morphologically, shrinkage, irregular forms and fragmentation of nuclei suggesting apoptotic bodies were observed in jasplakinolide-treated ERM, whilst actin filaments were extended in non-treated ERM. CONCLUSION Actin stabilization by jasplakinolide inhibited cell viability and induced apoptosis in epithelial cell rests of Malassez.
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Affiliation(s)
- N Aida
- Department of Endodontics and Clinical Cariology, Tokyo Dental College, Tokyo, Japan
| | - T Ushikubo
- Department of Endodontics and Clinical Cariology, Tokyo Dental College, Tokyo, Japan
| | - F Kobayashi
- Department of Endodontics and Clinical Cariology, Tokyo Dental College, Tokyo, Japan
| | - R Sako
- Department of Endodontics and Clinical Cariology, Tokyo Dental College, Tokyo, Japan
| | - M Suehara
- Department of Endodontics and Clinical Cariology, Tokyo Dental College, Tokyo, Japan
| | - M Furusawa
- Department of Endodontics and Clinical Cariology, Tokyo Dental College, Tokyo, Japan
| | - T Muramatsu
- Department of Endodontics and Clinical Cariology, Tokyo Dental College, Tokyo, Japan
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Austin P, Freeman SA, Gray CA, Gold MR, Vogl AW, Andersen RJ, Roberge M, Roskelley CD. The invasion inhibitor sarasinoside A1 reverses mesenchymal tumor transformation in an E-cadherin-independent manner. Mol Cancer Res 2013; 11:530-40. [PMID: 23399642 DOI: 10.1158/1541-7786.mcr-12-0385] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
During metastatic progression, an aberrant epithelial-to-mesenchymal transformation (EMT) that is most often driven by the loss of the cell-cell adhesion molecule E-cadherin generates noncohesive tumor cells that are highly invasive. We used mesenchymally transformed, E-cadherin-negative MDA-MB-231 breast carcinoma cells in a natural product screen and determined that the triterpenoid saponin sarasinoside A1 inhibited their invasion and the invasion of a number of other tumor cell lines. Sarasinoside A1 also caused MDA-MB-231 cells to become cohesive in a three-dimensional basement membrane and collagen gel cultures. In two-dimensional culture, sarasinoside A1 initiated a morphologic re-epithelialization of MDA-MB-231 cells wherein preexisting nonepithelial cadherins and the junction-associated proteins β-catenin and ZO-1 all relocalized to sites of cell-cell contact. In addition, the intercellular space between neighboring cells narrowed considerably, the stability of polymerized actin at cell-cell contact sites increased, and there was a recruitment and stabilization of nectin-based adhesion complexes to these sites, all of which strongly suggested that functional cell-cell junctions had formed. Importantly, sarasinoside A1 induced nascent cell-cell junction formation that did not require changes in gene expression and was not associated with an induction of E-cadherin but resulted in increased activation of Rap GTPases. Therefore, our findings with sarasinoside A1 suggest that it may be possible to re-epithelialize metastatic tumor cells with phenotypic consequence even when E-cadherin is completely absent.
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Affiliation(s)
- Pamela Austin
- Department of Cellular and Physiological Sciences, Life Sciences Institute, University of British Columbia, Vancouver, BC, Canada
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