1
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Takahashi C, Sato M, Sato C. Biofilm formation of Staphylococcus epidermidis imaged using atmospheric scanning electron microscopy. Anal Bioanal Chem 2021; 413:7549-7558. [PMID: 34671824 DOI: 10.1007/s00216-021-03720-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 09/01/2021] [Accepted: 10/05/2021] [Indexed: 11/30/2022]
Abstract
Staphylococcus epidermidis are gram-positive bacteria that form a biofilm around implanted devices and develop an infection into a chronic state. Recently, it has been revealed that microvesicles have important roles in biofilm formation and intercellular communication among bacteria. However, biofilm formation of Staphylococcus epidermidis, and its relation to microvesicle secretion, is poorly understood because of the difficulty required to preserve the delicate water-rich morphology of biofilm for high-resolution observations. Here, we successfully imaged the microvesicles secreted from Staphylococcus epidermidis and the subsequent process of their integration into biofilm using liquid-phase imaging using atmospheric scanning electron microscopy (ASEM). In the biofilm, cells were connected by nanotube-like structures attached by microvesicles, and surrounded by extracellular polymeric substances. Cells cultured in the ASEM specimen holder were aldehyde-fixed and stained using positively charged nanogold labelling and/or using National Center for Microscopy and Imaging Research method. The samples immersed in aqueous radical scavenger glucose buffer were imaged by the inverted SEM of ASEM. Information regarding the morphologies of microvesicles, nanotube-like fibrils, and biofilm formed by Staphylococcus epidermidis is expected to be useful to elucidate the biological mechanism of biofilm formation and to develop a medicine against biofilms and their associated infections.
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Affiliation(s)
- Chisato Takahashi
- Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology, 2266-98, Anagahora, Shimoshidami, Moriyama-ku, Nagoya, Aichi, 463-8560, Japan.
| | - Mari Sato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, Higashi 1-1-1, Tsukuba, Ibaraki, 305-8568, Japan
| | - Chikara Sato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, Higashi 1-1-1, Tsukuba, Ibaraki, 305-8568, Japan
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2
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Nakamura J, Maruyama Y, Tajima G, Komeiji Y, Suwa M, Sato C. Ca 2+-ATPase Molecules as a Calcium-Sensitive Membrane-Endoskeleton of Sarcoplasmic Reticulum. Int J Mol Sci 2021; 22:ijms22052624. [PMID: 33807779 PMCID: PMC7961605 DOI: 10.3390/ijms22052624] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Revised: 02/13/2021] [Accepted: 02/24/2021] [Indexed: 11/16/2022] Open
Abstract
The Ca2+-transport ATPase of sarcoplasmic reticulum (SR) is an integral, transmembrane protein. It sequesters cytoplasmic calcium ions released from SR during muscle contraction, and causes muscle relaxation. Based on negative staining and transmission electron microscopy of SR vesicles isolated from rabbit skeletal muscle, we propose that the ATPase molecules might also be a calcium-sensitive membrane-endoskeleton. Under conditions when the ATPase molecules scarcely transport Ca2+, i.e., in the presence of ATP and ≤ 0.9 nM Ca2+, some of the ATPase particles on the SR vesicle surface gathered to form tetramers. The tetramers crystallized into a cylindrical helical array in some vesicles and probably resulted in the elongated protrusion that extended from some round SRs. As the Ca2+ concentration increased to 0.2 µM, i.e., under conditions when the transporter molecules fully carry out their activities, the ATPase crystal arrays disappeared, but the SR protrusions remained. In the absence of ATP, almost all of the SR vesicles were round and no crystal arrays were evident, independent of the calcium concentration. This suggests that ATP induced crystallization at low Ca2+ concentrations. From the observed morphological changes, the role of the proposed ATPase membrane-endoskeleton is discussed in the context of calcium regulation during muscle contraction.
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Affiliation(s)
- Jun Nakamura
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan; (Y.M.); (Y.K.)
- Correspondence: (J.N.); (C.S.)
| | - Yuusuke Maruyama
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan; (Y.M.); (Y.K.)
| | - Genichi Tajima
- Institute for Excellence in Higher Education, Tohoku University, 41 Kawauchi, Aoba-ku, Sendai, Miyagi 980-8576, Japan;
| | - Yuto Komeiji
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan; (Y.M.); (Y.K.)
| | - Makiko Suwa
- Biological Science Course, Graduate School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuou-ku, Sagamihara, Kanagawa 252-5258, Japan;
| | - Chikara Sato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan; (Y.M.); (Y.K.)
- Correspondence: (J.N.); (C.S.)
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3
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Naya M, Sato C. Pyrene Excimer-Based Fluorescent Labeling of Cysteines Brought into Close Proximity by Protein Dynamics: ASEM-Induced Thiol-Ene Click Reaction for High Spatial Resolution CLEM. Int J Mol Sci 2020; 21:E7550. [PMID: 33066147 PMCID: PMC7589919 DOI: 10.3390/ijms21207550] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 10/02/2020] [Accepted: 10/08/2020] [Indexed: 12/16/2022] Open
Abstract
Fluorescence microscopy (FM) has revealed vital molecular mechanisms of life. Mainly, molecules labeled by fluorescent probes are imaged. However, the diversity of labeling probes and their functions remain limited. We synthesized a pyrene-based fluorescent probe targeting SH groups, which are important for protein folding and oxidative stress sensing in cells. The labeling achieved employs thiol-ene click reactions between the probes and SH groups and is triggered by irradiation by UV light or an electron beam. When two tagged pyrene groups were close enough to be excited as a dimer (excimer), they showed red-shifted fluorescence; theoretically, the proximity of two SH residues within ~30 Å can thus be monitored. Moreover, correlative light/electron microscopy (CLEM) was achieved using our atmospheric scanning electron microscope (ASEM); radicals formed in liquid by the electron beam caused the thiol-ene click reactions, and excimer fluorescence of the labeled proteins in cells and tissues was visualized by FM. Since the fluorescent labeling is induced by a narrow electron beam, high spatial resolution labeling is expected. The method can be widely applied to biological fields, for example, to study protein dynamics with or without cysteine mutagenesis, and to beam-induced micro-fabrication and the precise post-modification of materials.
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Affiliation(s)
- Masami Naya
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8566, Japan;
| | - Chikara Sato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8566, Japan;
- Master’s and Doctoral Programs in Neuroscience, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba 305-8574, Japan
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4
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Komenami T, Yoshimura A, Matsuno Y, Sato M, Sato C. Network of Palladium-Based Nanorings Synthesized by Liquid-Phase Reduction Using DMSO-H2O: In Situ Monitoring of Structure Formation and Drying Deformation by ASEM. Int J Mol Sci 2020; 21:ijms21093271. [PMID: 32380757 PMCID: PMC7247573 DOI: 10.3390/ijms21093271] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 04/28/2020] [Accepted: 04/28/2020] [Indexed: 01/01/2023] Open
Abstract
We developed a liquid-phase synthesis method for Pd-based nanostructure, in which Pd dissolved in dimethyl sulfoxide (DMSO) solutions was precipitated using acid aqueous solution. In the development of the method, in situ monitoring using atmospheric scanning electron microscopy (ASEM) revealed that three-dimensional (3D) Pd-based nanonetworks were deformed to micrometer-size particles possibly by the surface tension of the solutions during the drying process. To avoid surface tension, critical point drying was employed to dry the Pd-based precipitates. By combining ASEM monitoring with critical point drying, the synthesis parameters were optimized, resulting in the formation of lacelike delicate nanonetworks using citric acid aqueous solutions. Precipitation using HCl acid aqueous solutions allowed formation of 500-nm diameter nanorings connected by nanowires. The 3D nanostructure formation was controllable and modifiable into various shapes using different concentrations of the Pd and Cl ions as the parameters.
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Affiliation(s)
- Takuki Komenami
- Graduate School of Science and Engineering, Chiba University, Chiba 263-8522, Japan; (T.K.); (A.Y.)
| | - Akihiro Yoshimura
- Graduate School of Science and Engineering, Chiba University, Chiba 263-8522, Japan; (T.K.); (A.Y.)
| | - Yasunari Matsuno
- Graduate School of Science and Engineering, Chiba University, Chiba 263-8522, Japan; (T.K.); (A.Y.)
- Correspondence: (Y.M.); (C.S.); Tel.: +81-43-290-3467 (Y.M.); +81- 29-861-5562 (C.S.)
| | - Mari Sato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8566, Japan;
| | - Chikara Sato
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8566, Japan;
- Correspondence: (Y.M.); (C.S.); Tel.: +81-43-290-3467 (Y.M.); +81- 29-861-5562 (C.S.)
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5
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Matsumoto H, Nagashima M. Shift in the function of netrin-1 from axon outgrowth to axon branching in developing cerebral cortical neurons. BMC Neurosci 2017; 18:74. [PMID: 29041904 PMCID: PMC5645936 DOI: 10.1186/s12868-017-0392-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 10/10/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Netrin-1, a multifunctional axon guidance cue, elicits axon outgrowth via one of its receptors deleted in colorectal cancer (DCC) in several types of neurons, including cerebral cortical neurons of embryonic mice. However, we and others have observed de novo formation of axon branches without axon outgrowth induced by netrin-1 in cortical culture of neonatal hamsters. These previous reports suggested the possibility that netrin-1 function might alter during development, which we here investigated using dissociated culture prepared from cerebral cortices of embryonic mice. RESULTS Imaging analysis revealed netrin-1-induced outgrowth in embryonic day (E) 14 axons and netrin-1-induced branching in E16 axons. Netrin-1-evoked filopodial protrusions, which sprouted on the shafts of E16 axons preceding branch formation, were visualized by a novel method called atmospheric scanning electron microscopy. Treatment with an anti-DCC function-blocking antibody affected both axon outgrowth and branching. CONCLUSIONS Morphological analyses suggested a possibility of a shift in the function of netrin-1 in cortical axons during development, from promotion of outgrowth to promotion of branch formation starting with filopodial protrusion. Function-blocking experiments suggested that DCC may contribute not only to axon outgrowth but branching.
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Affiliation(s)
- Hideko Matsumoto
- Department of Anatomy, Faculty of Medicine, Saitama Medical University, 38 Morohongo, Moroyama-machi, Iruma-gun, Saitama, 350-0495, Japan.
| | - Masabumi Nagashima
- Department of Anatomy, Faculty of Medicine, Saitama Medical University, 38 Morohongo, Moroyama-machi, Iruma-gun, Saitama, 350-0495, Japan
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6
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Miles BT, Greenwood AB, Benito-Alifonso D, Tanner H, Galan MC, Verkade P, Gersen H. Direct Evidence of Lack of Colocalisation of Fluorescently Labelled Gold Labels Used in Correlative Light Electron Microscopy. Sci Rep 2017; 7:44666. [PMID: 28317888 PMCID: PMC5357795 DOI: 10.1038/srep44666] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Accepted: 02/13/2017] [Indexed: 12/16/2022] Open
Abstract
Fluorescently labelled nanoparticles are routinely used in Correlative Light Electron Microscopy (CLEM) to combine the capabilities of two separate microscope platforms: fluorescent light microscopy (LM) and electron microscopy (EM). The inherent assumption is that the fluorescent label observed under LM colocalises well with the electron dense nanoparticle observed in EM. Herein we show, by combining single molecule fluorescent imaging with optical detection of the scattering from single gold nanoparticles, that for a commercially produced sample of 10 nm gold nanoparticles tagged to Alexa-633 there is in fact no colocalisation between the fluorescent signatures of Alexa-633 and the scattering associated with the gold nanoparticle. This shows that the attached gold nanoparticle quenches the fluorescent signal by ~95%, or less likely that the complex has dissociated. In either scenario, the observed fluorescent signal in fact arises from a large population of untagged fluorophores; rendering these labels potentially ineffective and misleading to the field.
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Affiliation(s)
- Benjamin T. Miles
- Nanophotonics and Nanophysics Group, H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
| | - Alexander B. Greenwood
- Nanophotonics and Nanophysics Group, H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
| | | | - Hugh Tanner
- Bristol Centre for Functional Nanomaterials, H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
- School of Biochemistry, University of Bristol, Bristol, BS8 1TD, UK
| | - M. Carmen Galan
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, UK
| | - Paul Verkade
- Wolfson Bioimaging Facility, University of Bristol, Bristol, BS8 1TD, UK
- School of Biochemistry, University of Bristol, Bristol, BS8 1TD, UK
| | - Henkjan Gersen
- Nanophotonics and Nanophysics Group, H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
- Bristol Centre for Functional Nanomaterials, H.H. Wills Physics Laboratory, University of Bristol, Bristol, BS8 1TL, UK
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7
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Sugimoto S, Okuda KI, Miyakawa R, Sato M, Arita-Morioka KI, Chiba A, Yamanaka K, Ogura T, Mizunoe Y, Sato C. Imaging of bacterial multicellular behaviour in biofilms in liquid by atmospheric scanning electron microscopy. Sci Rep 2016; 6:25889. [PMID: 27180609 PMCID: PMC4867632 DOI: 10.1038/srep25889] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Accepted: 04/25/2016] [Indexed: 02/04/2023] Open
Abstract
Biofilms are complex communities of microbes that attach to biotic or abiotic surfaces causing chronic infectious diseases. Within a biofilm, microbes are embedded in a self-produced soft extracellular matrix (ECM), which protects them from the host immune system and antibiotics. The nanoscale visualisation of delicate biofilms in liquid is challenging. Here, we develop atmospheric scanning electron microscopy (ASEM) to visualise Gram-positive and -negative bacterial biofilms immersed in aqueous solution. Biofilms cultured on electron-transparent film were directly imaged from below using the inverted SEM, allowing the formation of the region near the substrate to be studied at high resolution. We visualised intercellular nanostructures and the exocytosis of membrane vesicles, and linked the latter to the trafficking of cargos, including cytoplasmic proteins and the toxins hemolysin and coagulase. A thick dendritic nanotube network was observed between microbes, suggesting multicellular communication in biofilms. A universal immuno-labelling system was developed for biofilms and tested on various examples, including S. aureus biofilms. In the ECM, fine DNA and protein networks were visualised and the precise distribution of protein complexes was determined (e.g., straight curli, flagella, and excreted cytoplasmic molecular chaperones). Our observations provide structural insights into bacteria-substratum interactions, biofilm development and the internal microbe community.
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Affiliation(s)
- Shinya Sugimoto
- Department of Bacteriology, The Jikei University School of Medicine, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo 105-8461, Japan.,Jikei Center for Biofilm Science and Technology, The Jikei University School of Medicine, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo 105-8461, Japan
| | - Ken-Ichi Okuda
- Department of Bacteriology, The Jikei University School of Medicine, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo 105-8461, Japan.,Jikei Center for Biofilm Science and Technology, The Jikei University School of Medicine, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo 105-8461, Japan
| | - Reina Miyakawa
- Department of Bacteriology, The Jikei University School of Medicine, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo 105-8461, Japan
| | - Mari Sato
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba, Ibaraki 305-8566, Japan
| | - Ken-Ichi Arita-Morioka
- Department of Molecular Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, Chuo-Ku, Kumamoto, 860-0811, Japan
| | - Akio Chiba
- Department of Bacteriology, The Jikei University School of Medicine, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo 105-8461, Japan
| | - Kunitoshi Yamanaka
- Department of Molecular Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, Chuo-Ku, Kumamoto, 860-0811, Japan
| | - Teru Ogura
- Department of Molecular Cell Biology, Institute of Molecular Embryology and Genetics, Kumamoto University, Chuo-Ku, Kumamoto, 860-0811, Japan
| | - Yoshimitsu Mizunoe
- Department of Bacteriology, The Jikei University School of Medicine, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo 105-8461, Japan.,Jikei Center for Biofilm Science and Technology, The Jikei University School of Medicine, 3-25-8 Nishi-Shimbashi, Minato-ku, Tokyo 105-8461, Japan
| | - Chikara Sato
- Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Higashi 1-1-1, Tsukuba, Ibaraki 305-8566, Japan
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8
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Gradov OV, Gradova MA. Methods of electron microscopy of biological and abiogenic structures in artificial gas atmospheres. SURFACE ENGINEERING AND APPLIED ELECTROCHEMISTRY 2016. [DOI: 10.3103/s1068375516010063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Liu Y, Metzinger MN, Lewellen KA, Cripps SN, Carey KD, Harper EI, Shi Z, Tarwater L, Grisoli A, Lee E, Slusarz A, Yang J, Loughran EA, Conley K, Johnson JJ, Klymenko Y, Bruney L, Liang Z, Dovichi NJ, Cheatham B, Leevy WM, Stack MS. Obesity Contributes to Ovarian Cancer Metastatic Success through Increased Lipogenesis, Enhanced Vascularity, and Decreased Infiltration of M1 Macrophages. Cancer Res 2015; 75:5046-57. [PMID: 26573796 PMCID: PMC4668203 DOI: 10.1158/0008-5472.can-15-0706] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Accepted: 08/26/2015] [Indexed: 12/14/2022]
Abstract
Epithelial ovarian cancer (EOC) is the leading cause of death from gynecologic malignancy, with high mortality attributable to widespread intraperitoneal metastases. Recent meta-analyses report an association between obesity, ovarian cancer incidence, and ovarian cancer survival, but the effect of obesity on metastasis has not been evaluated. The objective of this study was to use an integrative approach combining in vitro, ex vivo, and in vivo studies to test the hypothesis that obesity contributes to ovarian cancer metastatic success. Initial in vitro studies using three-dimensional mesomimetic cultures showed enhanced cell-cell adhesion to the lipid-loaded mesothelium. Furthermore, in an ex vivo colonization assay, ovarian cancer cells exhibited increased adhesion to mesothelial explants excised from mice modeling diet-induced obesity (DIO), in which they were fed a "Western" diet. Examination of mesothelial ultrastructure revealed a substantial increase in the density of microvilli in DIO mice. Moreover, enhanced intraperitoneal tumor burden was observed in overweight or obese animals in three distinct in vivo models. Further histologic analyses suggested that alterations in lipid regulatory factors, enhanced vascularity, and decreased M1/M2 macrophage ratios may account for the enhanced tumorigenicity. Together, these findings show that obesity potently affects ovarian cancer metastatic success, which likely contributes to the negative correlation between obesity and ovarian cancer survival.
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Affiliation(s)
- Yueying Liu
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Matthew N Metzinger
- Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Kyle A Lewellen
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Stephanie N Cripps
- University of Toledo College of Medicine and Life Sciences, Toledo, Ohio
| | - Kyle D Carey
- Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | | | - Zonggao Shi
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Laura Tarwater
- Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Annie Grisoli
- Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana
| | - Eric Lee
- Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Ania Slusarz
- Department of Pathology and Anatomical Sciences, University of Missouri School of Medicine, Columbia, Missouri. Department of Medical Physiology and Pharmacology, University of Missouri School of Medicine, Columbia, Missouri
| | - Jing Yang
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Elizabeth A Loughran
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Kaitlyn Conley
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Jeff J Johnson
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Yuliya Klymenko
- Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana
| | - Lana Bruney
- Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Department of Medical Physiology and Pharmacology, University of Missouri School of Medicine, Columbia, Missouri
| | - Zhong Liang
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | - Norman J Dovichi
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana
| | | | - W Matthew Leevy
- Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana
| | - M Sharon Stack
- Department of Chemistry and Biochemistry, Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana. Harper Cancer Research Institute, University of Notre Dame, Notre Dame, Indiana.
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10
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Sun L, Zheng J, Wang Q, Song R, Liu H, Meng R, Tao T, Si Y, Jiang W, He J. NHERF1 regulates actin cytoskeleton organization through modulation of α-actinin-4 stability. FASEB J 2015; 30:578-89. [PMID: 26432781 DOI: 10.1096/fj.15-275586] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 09/21/2015] [Indexed: 01/12/2023]
Abstract
The actin cytoskeleton is composed of a highly dynamic network of filamentous proteins, yet the molecular mechanism that regulates its organization and remodeling remains elusive. In this study, Na(+)/H(+) exchanger regulatory factor (NHERF)-1 loss-of-function and gain-of-function experiments reveal that polymerized actin cytoskeleton (F-actin) in HeLa cells is disorganized by NHERF1, whereas actin protein expression levels exhibit no detectable change. To elucidate the molecular mechanism underlying actin cytoskeleton disorganization by NHERF1, a combined 2-dimensional electrophoresis-matrix-assisted laser desorption/ionization-time of flight mass spectrometry approach was used to screen for proteins regulated by NHERF1 in HeLa cells. α-Actinin-4, an actin cross-linking protein, was identified. Glutathione S-transferase pull-down and coimmunoprecipitation studies showed the α-actinin-4 carboxyl-terminal region specifically interacted with the NHERF1 postsynaptic density 95/disc-large/zona occludens-1 domain. The NHERF1/α-actinin-4 interaction increased α-actinin-4 ubiquitination and decreased its expression levels, resulting in actin cytoskeleton disassembly. Our study identified α-actinin-4 as a novel NHERF1 interaction partner and provided new insights into the regulatory mechanism of the actin cytoskeleton by NHERF1.
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Affiliation(s)
- Licui Sun
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Junfang Zheng
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Qiqi Wang
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Ran Song
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Hua Liu
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Ran Meng
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Tao Tao
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Yang Si
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Wenguo Jiang
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
| | - Junqi He
- *Department of Biochemistry and Molecular Biology, Capital Medical University, Beijing, China; Beijing Key Laboratory for Tumor Invasion and Metastasis, Capital Medical University-Cardiff University Joint Centre for Biomedical Research, Cancer Institute of Capital Medical University, Beijing, China; and Metastasis and Angiogenesis Research Group, Department of Surgery, Cardiff University School of Medicine, Heath Park, Cardiff, United Kingdom
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Cell protrusions induced by hyaluronan synthase 3 (HAS3) resemble mesothelial microvilli and share cytoskeletal features of filopodia. Exp Cell Res 2015; 337:179-91. [DOI: 10.1016/j.yexcr.2015.06.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 06/18/2015] [Accepted: 06/20/2015] [Indexed: 01/04/2023]
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Murai T. Cholesterol lowering: role in cancer prevention and treatment. Biol Chem 2015; 396:1-11. [PMID: 25205720 DOI: 10.1515/hsz-2014-0194] [Citation(s) in RCA: 140] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Accepted: 06/15/2014] [Indexed: 12/11/2022]
Abstract
The accumulation of cholesterol is a general feature of cancer tissue, and recent evidence suggests that cholesterol plays critical roles in the progression of cancers, including breast, prostate, and colorectal cancers. The dysregulation of metabolic pathways, including those involved in cholesterol biosynthesis, is implicated in tumor development and cancer progression. Lipid rafts are highly dynamic cholesterol-enriched domains of the cell membrane, involved in various cellular functions, including the regulation of transmembrane signaling at the cell surface. It was recently demonstrated that lipid rafts also play critical roles in cancer cell adhesion and migration. This review focuses on our current understanding of how cholesterol regulation, lipid rafts, and dysregulated cholesterol biosynthesis contribute to cancer development and progression, and the therapeutic potential of cholesterol lowering for cancer prevention and treatment.
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Zhang W, Hu J, Ma Q, Hu S, Wang Y, Wen X, Ma Y, Xu H, Qian H, Xu W. Cryopreserved mouse fetal liver stromal cells treated with mitomycin C are able to support the growth of human embryonic stem cells. Exp Ther Med 2014; 8:935-942. [PMID: 25120627 PMCID: PMC4113635 DOI: 10.3892/etm.2014.1801] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Accepted: 06/11/2014] [Indexed: 01/02/2023] Open
Abstract
An immortalized mouse fetal liver stromal cell line, named KM3, has demonstrated the potential to support the growth and maintenance of human embryonic stem cells (hESCs). In this study, the characteristics of KM3 cells were examined following cryopreservation at -70°C and in liquid nitrogen for 15, 30 and 60 days following treatment with 10 μg/ml mitomycin C. In addition, whether the KM3 cells were suitable for use as feeder cells to support the growth of hESCs was evaluated. The inhibition of mitosis without cell death was observed when the KM3 cells were treated with 10 μg/ml mitomycin C for 2 h. The morphology of the KM3 cells cryopreserved in liquid nitrogen for 60 days was not markedly changed, and the cell survival rate was 84.60±1.14%. By contrast, the survival rate of the KM3 cells was 66.40±2.88% following cryopreservation at -70°C for 60 days; the cells readily detached, were maintained for a shorter time, and had a reduced expression level of basic fibroblast growth factor. hESCs cultured on KM3 cells cryopreserved in liquid nitrogen for 60 days showed the typical bird's nest structure, with clear boundaries and a differentiation rate of 16.33±2.08%. The differentiation rate of hESCs cultured on KM3 cells cryopreserved at -70°C for 60 days was 37.67±3.51%. These results indicate that the cryopreserved KM3 cells treated with mitomycin C may be directly used in the subculture of hESCs, and the effect is relatively good with -70°C short-term or liquid nitrogen cryopreservation.
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Affiliation(s)
- Wei Zhang
- School of Medical Science and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Jiabo Hu
- School of Medical Science and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Quanhui Ma
- Department of Clinical Laboratory, Jiangsu Provincial Hospital on Integration of Chinese and Western Medicine, Nanjing, Jiangsu 210028, P.R. China
| | - Sanqiang Hu
- Maternal and Child Care Service Centre of Lianyungang, Lianyungang, Jiangsu 222006, P.R. China
| | - Yanyan Wang
- School of Medical Science and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Xiangmei Wen
- School of Medical Science and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China ; Department of Clinical Laboratory, Zhenjiang Centre for Disease Prevention and Control, Zhenjiang, Jiangsu 212003, P.R. China
| | - Yongbin Ma
- School of Medical Science and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Hong Xu
- Department of Clinical Laboratory, Zhenjiang Centre for Disease Prevention and Control, Zhenjiang, Jiangsu 212003, P.R. China
| | - Hui Qian
- School of Medical Science and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
| | - Wenrong Xu
- School of Medical Science and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu 212013, P.R. China
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