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  1. Article: Multiplexed 3D Analysis of Immune States and Niches in Human Tissue.

    Yapp, Clarence / Nirmal, Ajit J / Zhou, Felix / Maliga, Zoltan / Tefft, Juliann B / Llopis, Paula Montero / Murphy, George F / Lian, Christine G / Danuser, Gaudenz / Santagata, Sandro / Sorger, Peter K

    bioRxiv : the preprint server for biology

    2024  

    Abstract: Tissue homeostasis and the emergence of disease are controlled by changes in the proportions of resident and recruited cells, their organization into cellular neighbourhoods, and their interactions with acellular tissue components. Highly multiplexed ... ...

    Abstract Tissue homeostasis and the emergence of disease are controlled by changes in the proportions of resident and recruited cells, their organization into cellular neighbourhoods, and their interactions with acellular tissue components. Highly multiplexed tissue profiling (spatial omics)
    Language English
    Publishing date 2024-03-28
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.11.10.566670
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Cell wall synthesis and remodelling dynamics determine division site architecture and cell shape in Escherichia coli.

    Navarro, Paula P / Vettiger, Andrea / Ananda, Virly Y / Llopis, Paula Montero / Allolio, Christoph / Bernhardt, Thomas G / Chao, Luke H

    Nature microbiology

    2022  Volume 7, Issue 10, Page(s) 1621–1634

    Abstract: The bacterial division apparatus catalyses the synthesis and remodelling of septal peptidoglycan (sPG) to build the cell wall layer that fortifies the daughter cell poles. Understanding of this essential process has been limited by the lack of native ... ...

    Abstract The bacterial division apparatus catalyses the synthesis and remodelling of septal peptidoglycan (sPG) to build the cell wall layer that fortifies the daughter cell poles. Understanding of this essential process has been limited by the lack of native three-dimensional views of developing septa. Here, we apply state-of-the-art cryogenic electron tomography (cryo-ET) and fluorescence microscopy to visualize the division site architecture and sPG biogenesis dynamics of the Gram-negative bacterium Escherichia coli. We identify a wedge-like sPG structure that fortifies the ingrowing septum. Experiments with strains defective in sPG biogenesis revealed that the septal architecture and mode of division can be modified to more closely resemble that of other Gram-negative (Caulobacter crescentus) or Gram-positive (Staphylococcus aureus) bacteria, suggesting that a conserved mechanism underlies the formation of different septal morphologies. Finally, analysis of mutants impaired in amidase activation (ΔenvC ΔnlpD) showed that cell wall remodelling affects the placement and stability of the cytokinetic ring. Taken together, our results support a model in which competition between the cell elongation and division machineries determines the shape of cell constrictions and the poles they form. They also highlight how the activity of the division system can be modulated to help generate the diverse array of shapes observed in the bacterial domain.
    MeSH term(s) Amidohydrolases ; Cell Division ; Cell Shape ; Cell Wall ; Escherichia coli/physiology ; Peptidoglycan
    Chemical Substances Peptidoglycan ; Amidohydrolases (EC 3.5.-)
    Language English
    Publishing date 2022-09-12
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ISSN 2058-5276
    ISSN (online) 2058-5276
    DOI 10.1038/s41564-022-01210-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Toxicity, uptake, and nuclear translocation of ingested micro-nanoplastics in an in vitro model of the small intestinal epithelium

    DeLoid, Glen M. / Cao, Xiaoqiong / Bitounis, Dimitrios / Singh, Dilpreet / Llopis, Paula Montero / Buckley, Brian / Demokritou, Philip

    Food and chemical toxicology. 2021 Dec., v. 158

    2021  

    Abstract: Despite mounting evidence of increasing micro- and nanoplastics (MNPs) in natural environments, food, and drinking water, little is known of the potential health hazards of MNPs ingestion. We assessed toxicity and uptake of environmentally relevant MNPs ... ...

    Abstract Despite mounting evidence of increasing micro- and nanoplastics (MNPs) in natural environments, food, and drinking water, little is known of the potential health hazards of MNPs ingestion. We assessed toxicity and uptake of environmentally relevant MNPs in an in vitro small intestinal epithelium (SIE). Test MNPs included 25 and 1000 nm polystyrene (PS) microspheres (PS25 and PS1K); 25, 100, and 1000 nm carboxyl modified PS spheres (PS25C, PS100C, and PS1KC), and secondary MNPs from incinerated polyethylene (PEI). MNPs were subjected to 3-phase digestion to mimic transformations in the gastrointestinal tract (GIT) and digestas applied to the SIE. Carboxylated MNPs significantly reduced viability and increased permeability to 3 kD dextran. Uptake of carboxyl PS materials was size dependent, with significantly greater uptake of PS25C. Fluorescence confocal imaging showed some PS25C agglomerates entering cells independent of endosomes (suggesting diffusion), others within actin shells (suggesting phagocytosis), and many free within the epithelial cells, including agglomerates within nuclei. Pre-treatment with the dynamin inhibitor Dyngo partially reduced PS25 translocation, suggesting a potential role for endocytosis. These findings suggest that ingestion exposures to MNPs could have serious health consequences and underscore the urgent need for additional detailed studies of the potential hazards of ingested MNPs.
    Keywords actin ; carboxylation ; dextran ; digestion ; digestive tract ; dynamins ; endosomes ; fluorescence ; ingestion ; intestinal mucosa ; microparticles ; models ; nanoplastics ; permeability ; phagocytosis ; polyethylene ; polystyrenes ; toxicity ; toxicology ; viability
    Language English
    Dates of publication 2021-12
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 782617-5
    ISSN 1873-6351 ; 0278-6915
    ISSN (online) 1873-6351
    ISSN 0278-6915
    DOI 10.1016/j.fct.2021.112609
    Database NAL-Catalogue (AGRICOLA)

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  4. Article ; Online: Toxicity, uptake, and nuclear translocation of ingested micro-nanoplastics in an in vitro model of the small intestinal epithelium.

    DeLoid, Glen M / Cao, Xiaoqiong / Bitounis, Dimitrios / Singh, Dilpreet / Llopis, Paula Montero / Buckley, Brian / Demokritou, Philip

    Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association

    2021  Volume 158, Page(s) 112609

    Abstract: Despite mounting evidence of increasing micro- and nanoplastics (MNPs) in natural environments, food, and drinking water, little is known of the potential health hazards of MNPs ingestion. We assessed toxicity and uptake of environmentally relevant MNPs ... ...

    Abstract Despite mounting evidence of increasing micro- and nanoplastics (MNPs) in natural environments, food, and drinking water, little is known of the potential health hazards of MNPs ingestion. We assessed toxicity and uptake of environmentally relevant MNPs in an in vitro small intestinal epithelium (SIE). Test MNPs included 25 and 1000 nm polystyrene (PS) microspheres (PS25 and PS1K); 25, 100, and 1000 nm carboxyl modified PS spheres (PS25C, PS100C, and PS1KC), and secondary MNPs from incinerated polyethylene (PEI). MNPs were subjected to 3-phase digestion to mimic transformations in the gastrointestinal tract (GIT) and digestas applied to the SIE. Carboxylated MNPs significantly reduced viability and increased permeability to 3 kD dextran. Uptake of carboxyl PS materials was size dependent, with significantly greater uptake of PS25C. Fluorescence confocal imaging showed some PS25C agglomerates entering cells independent of endosomes (suggesting diffusion), others within actin shells (suggesting phagocytosis), and many free within the epithelial cells, including agglomerates within nuclei. Pre-treatment with the dynamin inhibitor Dyngo partially reduced PS25 translocation, suggesting a potential role for endocytosis. These findings suggest that ingestion exposures to MNPs could have serious health consequences and underscore the urgent need for additional detailed studies of the potential hazards of ingested MNPs.
    MeSH term(s) Actins ; Biological Transport ; Caco-2 Cells ; Cell Nucleus ; Endocytosis ; Environmental Exposure/adverse effects ; Epithelial Cells/metabolism ; HT29 Cells ; Humans ; Intestinal Mucosa/metabolism ; Intestine, Small/metabolism ; Microplastics/metabolism ; Microplastics/toxicity ; Microspheres ; Nanostructures ; Optical Imaging ; Particle Size ; Permeability ; Polyethylene/chemistry ; Polystyrenes/metabolism ; Polystyrenes/toxicity ; Water Pollutants, Chemical/metabolism ; Water Pollutants, Chemical/toxicity
    Chemical Substances Actins ; Microplastics ; Polystyrenes ; Water Pollutants, Chemical ; Polyethylene (9002-88-4)
    Language English
    Publishing date 2021-10-18
    Publishing country England
    Document type Journal Article
    ZDB-ID 782617-5
    ISSN 1873-6351 ; 0278-6915
    ISSN (online) 1873-6351
    ISSN 0278-6915
    DOI 10.1016/j.fct.2021.112609
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: A biologist's guide to planning and performing quantitative bioimaging experiments.

    Senft, Rebecca A / Diaz-Rohrer, Barbara / Colarusso, Pina / Swift, Lucy / Jamali, Nasim / Jambor, Helena / Pengo, Thomas / Brideau, Craig / Llopis, Paula Montero / Uhlmann, Virginie / Kirk, Jason / Gonzales, Kevin Andrew / Bankhead, Peter / Evans, Edward L / Eliceiri, Kevin W / Cimini, Beth A

    PLoS biology

    2023  Volume 21, Issue 6, Page(s) e3002167

    Abstract: Technological advancements in biology and microscopy have empowered a transition from bioimaging as an observational method to a quantitative one. However, as biologists are adopting quantitative bioimaging and these experiments become more complex, ... ...

    Abstract Technological advancements in biology and microscopy have empowered a transition from bioimaging as an observational method to a quantitative one. However, as biologists are adopting quantitative bioimaging and these experiments become more complex, researchers need additional expertise to carry out this work in a rigorous and reproducible manner. This Essay provides a navigational guide for experimental biologists to aid understanding of quantitative bioimaging from sample preparation through to image acquisition, image analysis, and data interpretation. We discuss the interconnectedness of these steps, and for each, we provide general recommendations, key questions to consider, and links to high-quality open-access resources for further learning. This synthesis of information will empower biologists to plan and execute rigorous quantitative bioimaging experiments efficiently.
    MeSH term(s) Microscopy ; Image Processing, Computer-Assisted
    Language English
    Publishing date 2023-06-27
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 2126776-5
    ISSN 1545-7885 ; 1544-9173
    ISSN (online) 1545-7885
    ISSN 1544-9173
    DOI 10.1371/journal.pbio.3002167
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: MethodsJ2: a software tool to capture metadata and generate comprehensive microscopy methods text.

    Ryan, Joel / Pengo, Thomas / Rigano, Alex / Llopis, Paula Montero / Itano, Michelle S / Cameron, Lisa A / Marqués, Guillermo / Strambio-De-Castillia, Caterina / Sanders, Mark A / Brown, Claire M

    Nature methods

    2021  Volume 18, Issue 12, Page(s) 1414–1416

    MeSH term(s) Cell Nucleus/ultrastructure ; Chromatin/ultrastructure ; Humans ; Image Processing, Computer-Assisted/methods ; Image Processing, Computer-Assisted/standards ; Medical Informatics/statistics & numerical data ; Metadata/statistics & numerical data ; Microscopy/methods ; Software
    Chemical Substances Chromatin
    Language English
    Publishing date 2021-10-28
    Publishing country United States
    Document type Letter ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2169522-2
    ISSN 1548-7105 ; 1548-7091
    ISSN (online) 1548-7105
    ISSN 1548-7091
    DOI 10.1038/s41592-021-01290-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Hepatitis C virus NS3-4A protease regulates the lipid environment for RNA replication by cleaving host enzyme 24-dehydrocholesterol reductase.

    Tallorin, Lorillee / Villareal, Valerie A / Hsia, Chih-Yun / Rodgers, Mary A / Burri, Dominique J / Pfeil, Marc-Philipp / Llopis, Paula Montero / Lindenbach, Brett D / Yang, Priscilla L

    The Journal of biological chemistry

    2020  Volume 295, Issue 35, Page(s) 12426–12436

    Abstract: Many RNA viruses create specialized membranes for genome replication by manipulating host lipid metabolism and trafficking, but in most cases, we do not know the molecular mechanisms responsible or how specific lipids may impact the associated membrane ... ...

    Abstract Many RNA viruses create specialized membranes for genome replication by manipulating host lipid metabolism and trafficking, but in most cases, we do not know the molecular mechanisms responsible or how specific lipids may impact the associated membrane and viral process. For example, hepatitis C virus (HCV) causes a specific, large-fold increase in the steady-state abundance of intracellular desmosterol, an immediate precursor of cholesterol, resulting in increased fluidity of the membrane where HCV RNA replication occurs. Here, we establish the mechanism responsible for HCV's effect on intracellular desmosterol, whereby the HCV NS3-4A protease controls activity of 24-dehydrocholesterol reductase (DHCR24), the enzyme that catalyzes conversion of desmosterol to cholesterol. Our cumulative evidence for the proposed mechanism includes immunofluorescence microscopy experiments showing co-occurrence of DHCR24 and HCV NS3-4A protease; formation of an additional, faster-migrating DHCR24 species (DHCR24*) in cells harboring a HCV subgenomic replicon RNA or ectopically expressing NS3-4A; and biochemical evidence that NS3-4A cleaves DHCR24 to produce DHCR24*
    MeSH term(s) Cell Line, Tumor ; Hepacivirus/enzymology ; Hepacivirus/genetics ; Humans ; Lipid Metabolism ; Membrane Lipids/genetics ; Membrane Lipids/metabolism ; Nerve Tissue Proteins/genetics ; Nerve Tissue Proteins/metabolism ; Oxidoreductases Acting on CH-CH Group Donors/genetics ; Oxidoreductases Acting on CH-CH Group Donors/metabolism ; Proteolysis ; RNA, Viral/biosynthesis ; RNA, Viral/genetics ; Serine Proteases/genetics ; Serine Proteases/metabolism ; Viral Nonstructural Proteins/genetics ; Viral Nonstructural Proteins/metabolism
    Chemical Substances Membrane Lipids ; Nerve Tissue Proteins ; RNA, Viral ; Viral Nonstructural Proteins ; Oxidoreductases Acting on CH-CH Group Donors (EC 1.3.-) ; DHCR24 protein, human (EC 1.3.1.-) ; NS3-4A serine protease, Hepatitis C virus (EC 3.4.-) ; Serine Proteases (EC 3.4.-)
    Language English
    Publishing date 2020-07-08
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2997-x
    ISSN 1083-351X ; 0021-9258
    ISSN (online) 1083-351X
    ISSN 0021-9258
    DOI 10.1074/jbc.RA120.013455
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: CAR T cell killing requires the IFNγR pathway in solid but not liquid tumours.

    Larson, Rebecca C / Kann, Michael C / Bailey, Stefanie R / Haradhvala, Nicholas J / Llopis, Paula Montero / Bouffard, Amanda A / Scarfó, Irene / Leick, Mark B / Grauwet, Korneel / Berger, Trisha R / Stewart, Kai / Anekal, Praju Vikas / Jan, Max / Joung, Julia / Schmidts, Andrea / Ouspenskaia, Tamara / Law, Travis / Regev, Aviv / Getz, Gad /
    Maus, Marcela V

    Nature

    2022  Volume 604, Issue 7906, Page(s) 563–570

    Abstract: Chimeric antigen receptor (CAR) therapy has had a transformative effect on the treatment of haematologic ... ...

    Abstract Chimeric antigen receptor (CAR) therapy has had a transformative effect on the treatment of haematologic malignancies
    MeSH term(s) Cell Death ; Glioblastoma/genetics ; Glioblastoma/therapy ; Humans ; Immunotherapy, Adoptive ; Receptors, Chimeric Antigen ; T-Lymphocytes/pathology
    Chemical Substances Receptors, Chimeric Antigen
    Language English
    Publishing date 2022-04-13
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-022-04585-5
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Suppression of amber codons in Caulobacter crescentus by the orthogonal Escherichia coli histidyl-tRNA synthetase/tRNAHis pair.

    Ko, Jae-hyeong / Llopis, Paula Montero / Heinritz, Jennifer / Jacobs-Wagner, Christine / Söll, Dieter

    PloS one

    2013  Volume 8, Issue 12, Page(s) e83630

    Abstract: While translational read-through of stop codons by suppressor tRNAs is common in many bacteria, archaea and eukaryotes, this phenomenon has not yet been observed in the α-proteobacterium Caulobacter crescentus. Based on a previous report that C. ... ...

    Abstract While translational read-through of stop codons by suppressor tRNAs is common in many bacteria, archaea and eukaryotes, this phenomenon has not yet been observed in the α-proteobacterium Caulobacter crescentus. Based on a previous report that C. crescentus and Escherichia coli tRNA(His) have distinctive identity elements, we constructed E. coli tRNA(His) CUA, a UAG suppressor tRNA for C. crescentus. By examining the expression of three UAG codon- containing reporter genes (encoding a β-lactamase, the fluorescent mCherry protein, or the C. crescentus xylonate dehydratase), we demonstrated that the E. coli histidyl-tRNA synthetase/tRNA(His) CUA pair enables in vivo UAG suppression in C. crescentus. E. coli histidyl-tRNA synthetase (HisRS) or tRNA(His) CUA alone did not achieve suppression; this indicates that the E. coli HisRS/tRNA(His) CUA pair is orthogonal in C. crescentus. These results illustrate that UAG suppression can be achieved in C. crescentus with an orthogonal aminoacyl-tRNA synthetase/suppressor tRNA pair.
    MeSH term(s) Ampicillin Resistance/genetics ; Caulobacter crescentus/genetics ; Caulobacter crescentus/metabolism ; Codon, Terminator ; Escherichia coli/genetics ; Escherichia coli/metabolism ; Gene Expression ; Gene Expression Regulation, Bacterial ; Histidine-tRNA Ligase/metabolism ; RNA, Transfer, His/genetics ; RNA, Transfer, His/metabolism
    Chemical Substances Codon, Terminator ; RNA, Transfer, His ; Histidine-tRNA Ligase (EC 6.1.1.21)
    Language English
    Publishing date 2013-12-30
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 1932-6203
    ISSN (online) 1932-6203
    DOI 10.1371/journal.pone.0083630
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: VLDLR and ApoER2 are receptors for multiple alphaviruses.

    Clark, Lars E / Clark, Sarah A / Lin, ChieYu / Liu, Jianying / Coscia, Adrian / Nabel, Katherine G / Yang, Pan / Neel, Dylan V / Lee, Hyo / Brusic, Vesna / Stryapunina, Iryna / Plante, Kenneth S / Ahmed, Asim A / Catteruccia, Flaminia / Young-Pearse, Tracy L / Chiu, Isaac M / Llopis, Paula Montero / Weaver, Scott C / Abraham, Jonathan

    Nature

    2021  Volume 602, Issue 7897, Page(s) 475–480

    Abstract: Alphaviruses, like many other arthropod-borne viruses, infect vertebrate species and insect vectors separated by hundreds of millions of years of evolutionary history. Entry into evolutionarily divergent host cells can be accomplished by recognition of ... ...

    Abstract Alphaviruses, like many other arthropod-borne viruses, infect vertebrate species and insect vectors separated by hundreds of millions of years of evolutionary history. Entry into evolutionarily divergent host cells can be accomplished by recognition of different cellular receptors in different species, or by binding to receptors that are highly conserved across species. Although multiple alphavirus receptors have been described
    MeSH term(s) Animals ; LDL-Receptor Related Proteins ; Ligands ; Mice ; Mosquito Vectors ; Receptors, LDL ; Semliki forest virus/metabolism ; Sindbis Virus/physiology
    Chemical Substances LDL-Receptor Related Proteins ; Ligands ; Receptors, LDL ; VLDL receptor ; low density lipoprotein receptor-related protein 8
    Language English
    Publishing date 2021-12-20
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/s41586-021-04326-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

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