LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 11

Search options

  1. Article ; Online: Machine learning analysis of human skin by optoacoustic mesoscopy for automated extraction of psoriasis and aging biomarkers.

    He, Hailong / Paetzold, Johannes C / Borner, Nils / Riedel, Erik / Gerl, Stefan / Schneider, Simon / Fisher, Chiara / Ezhov, Ivan / Shit, Suprosanna / Li, Hongwei / Ruckert, Daniel / Aguirre, Juan / Biedermann, Tilo / Darsow, Ulf / Menze, Bjoern / Ntziachristos, Vasilis

    IEEE transactions on medical imaging

    2024  Volume PP

    Abstract: Ultra-wideband raster-scan optoacoustic mesoscopy (RSOM) is a novel modality that has demonstrated unprecedented ability to visualize epidermal and dermal structures in-vivo. However, an automatic and quantitative analysis of three-dimensional RSOM ... ...

    Abstract Ultra-wideband raster-scan optoacoustic mesoscopy (RSOM) is a novel modality that has demonstrated unprecedented ability to visualize epidermal and dermal structures in-vivo. However, an automatic and quantitative analysis of three-dimensional RSOM datasets remains unexplored. In this work we present our framework: Deep Learning RSOM Analysis Pipeline (DeepRAP), to analyze and quantify morphological skin features recorded by RSOM and extract imaging biomarkers for disease characterization. DeepRAP uses a multi-network segmentation strategy based on convolutional neural networks with transfer learning. This strategy enabled the automatic recognition of skin layers and subsequent segmentation of dermal microvasculature with an accuracy equivalent to human assessment. DeepRAP was validated against manual segmentation on 25 psoriasis patients under treatment and our biomarker extraction was shown to characterize disease severity and progression well with a strong correlation to physician evaluation and histology. In a unique validation experiment, we applied DeepRAP in a time series sequence of occlusion-induced hyperemia from 10 healthy volunteers. We observe how the biomarkers decrease and recover during the occlusion and release process, demonstrating accurate performance and reproducibility of DeepRAP. Furthermore, we analyzed a cohort of 75 volunteers and defined a relationship between aging and microvascular features in-vivo. More precisely, this study revealed that fine microvascular features in the dermal layer have the strongest correlation to age. The ability of our newly developed framework to enable the rapid study of human skin morphology and microvasculature in-vivo promises to replace biopsy studies, increasing the translational potential of RSOM.
    Language English
    Publishing date 2024-01-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 622531-7
    ISSN 1558-254X ; 0278-0062
    ISSN (online) 1558-254X
    ISSN 0278-0062
    DOI 10.1109/TMI.2024.3356180
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Regionally Altered Immunosignals of Surfactant Protein-G, Vascular and Non-Vascular Elements of the Neurovascular Unit after Experimental Focal Cerebral Ischemia in Mice, Rats, and Sheep.

    Michalski, Dominik / Reimann, Willi / Spielvogel, Emma / Mages, Bianca / Biedermann, Bernd / Barthel, Henryk / Nitzsche, Björn / Schob, Stefan / Härtig, Wolfgang

    International journal of molecular sciences

    2022  Volume 23, Issue 11

    Abstract: The surfactant protein-G (SP-G) has recently been discovered in the brain and linked to fluid balance regulations. Stroke is characterized by impaired vessel integrity, promoting water influx and edema formation. The neurovascular unit concept (NVU) has ... ...

    Abstract The surfactant protein-G (SP-G) has recently been discovered in the brain and linked to fluid balance regulations. Stroke is characterized by impaired vessel integrity, promoting water influx and edema formation. The neurovascular unit concept (NVU) has been generated to cover not only ischemic affections of neurons or vessels but also other regionally associated cells. This study provides the first spatio-temporal characterization of SP-G and NVU elements after experimental stroke. Immunofluorescence labeling was applied to explore SP-G, vascular and cellular markers in mice (4, 24, and 72 h of ischemia), rats (24 h of ischemia), and sheep (two weeks of ischemia). Extravasated albumin indicated vascular damage within ischemic areas. Quantifications revealed decreasing SP-G signals in the ischemia-affected neocortex and subcortex. Inverse immunosignals of SP-G and vascular elements existed throughout all models. Despite local associations between SP-G and the vasculature, a definite co-localization was not seen. Along with a decreased SP-G-immunoreactivity in ischemic areas, signals originating from neurons, glial elements, and the extracellular matrix exhibited morphological alterations or changed intensities. Collectively, this study revealed regional alterations of SP-G, vascular, and non-vascular NVU elements after ischemia, and may thus stimulate the discussion about the role of SP-G during stroke.
    MeSH term(s) Animals ; Brain Ischemia ; Cerebral Infarction ; Mice ; Neocortex ; Rats ; Sheep ; Stroke ; Surface-Active Agents
    Chemical Substances Surface-Active Agents
    Language English
    Publishing date 2022-05-24
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms23115875
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Regionally Altered Immunosignals of Surfactant Protein-G, Vascular and Non-Vascular Elements of the Neurovascular Unit after Experimental Focal Cerebral Ischemia in Mice, Rats, and Sheep

    Dominik Michalski / Willi Reimann / Emma Spielvogel / Bianca Mages / Bernd Biedermann / Henryk Barthel / Björn Nitzsche / Stefan Schob / Wolfgang Härtig

    International Journal of Molecular Sciences, Vol 23, Iss 5875, p

    2022  Volume 5875

    Abstract: The surfactant protein-G (SP-G) has recently been discovered in the brain and linked to fluid balance regulations. Stroke is characterized by impaired vessel integrity, promoting water influx and edema formation. The neurovascular unit concept (NVU) has ... ...

    Abstract The surfactant protein-G (SP-G) has recently been discovered in the brain and linked to fluid balance regulations. Stroke is characterized by impaired vessel integrity, promoting water influx and edema formation. The neurovascular unit concept (NVU) has been generated to cover not only ischemic affections of neurons or vessels but also other regionally associated cells. This study provides the first spatio-temporal characterization of SP-G and NVU elements after experimental stroke. Immunofluorescence labeling was applied to explore SP-G, vascular and cellular markers in mice (4, 24, and 72 h of ischemia), rats (24 h of ischemia), and sheep (two weeks of ischemia). Extravasated albumin indicated vascular damage within ischemic areas. Quantifications revealed decreasing SP-G signals in the ischemia-affected neocortex and subcortex. Inverse immunosignals of SP-G and vascular elements existed throughout all models. Despite local associations between SP-G and the vasculature, a definite co-localization was not seen. Along with a decreased SP-G-immunoreactivity in ischemic areas, signals originating from neurons, glial elements, and the extracellular matrix exhibited morphological alterations or changed intensities. Collectively, this study revealed regional alterations of SP-G, vascular, and non-vascular NVU elements after ischemia, and may thus stimulate the discussion about the role of SP-G during stroke.
    Keywords surfactant protein-G ; vasculature ; collagen IV ; neurovascular unit ; stroke ; focal cerebral ischemia ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Subject code 610
    Language English
    Publishing date 2022-05-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  4. Article ; Online: High-pressure phase behavior of SrCO3

    Nicole Biedermann / S. Speziale / Björn Winkler / Hans-Josef Reichmann / M. Koch-Müller / Gerhard Heide

    Physics and Chemistry of Minerals

    an experimental and computational Raman scattering study

    2017  

    Publishing country de
    Document type Article ; Online
    DOI 10.1007/s00269-016-0861-2
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  5. Article ; Online: The Quaking family of RNA-binding proteins: coordinators of the cell cycle and differentiation.

    Biedermann, Bjoern / Hotz, Hans-Rudolf / Ciosk, Rafal

    Cell cycle (Georgetown, Tex.)

    2010  Volume 9, Issue 10, Page(s) 1929–1933

    Abstract: Transcriptional and epigenetic control of gene expression is critical for cell fate specification, commitment and terminal differentiation during development. However, also regulatory RNAs and RNA-binding proteins have emerged as critical developmental ... ...

    Abstract Transcriptional and epigenetic control of gene expression is critical for cell fate specification, commitment and terminal differentiation during development. However, also regulatory RNAs and RNA-binding proteins have emerged as critical developmental regulators. They control various aspects of mRNA metabolism such as stability, translation, and localization, and similar to some transcriptional regulators, such as PAX5 and MYC, they can affect gene expression on a massive scale. Consistently, defects in many mRNA regulators have been implicated in a number of human disorders, including cancer. Quaking-related (QR) proteins are conserved RNA-binding proteins of the STAR (signal transduction and activation of RNA) family. QR proteins regulate expression of diverse mRNA targets by various mechanisms, play essential roles in a whole host of developmental decisions, and function as tumor suppressors. This review discusses several best-studied members of the QR family, their developmental functions, molecular mechanisms, representative mRNA targets, and their intriguing ability to coordinately control the cell cycle and a wide range of differentiation pathways.
    MeSH term(s) Animals ; Cell Cycle/genetics ; Cell Cycle/physiology ; Cell Differentiation/genetics ; Cell Differentiation/physiology ; Humans ; Models, Biological ; Phylogeny ; RNA-Binding Proteins/classification ; RNA-Binding Proteins/genetics ; RNA-Binding Proteins/metabolism
    Chemical Substances RNA-Binding Proteins
    Language English
    Publishing date 2010-05-15
    Publishing country United States
    Document type Journal Article ; Review
    ZDB-ID 2146183-1
    ISSN 1551-4005 ; 1538-4101 ; 1554-8627
    ISSN (online) 1551-4005
    ISSN 1538-4101 ; 1554-8627
    DOI 10.4161/cc.9.10.11533
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Thesis ; Book: Dokumentation der Fußball-Europameisterschaft 2000

    Biedermann, Björn

    unter besonderer Berücksichtigung der deutschen Teilnahme

    2000  

    Author's details von Björn Biedermann
    Size III, 282 Blatt: zahlreiche Illustrationen
    Document type Thesis ; Book
    Thesis / German Habilitation thesis Köln, Deutsche Sporthochschule, Diplomarbeit 2000
    HBZ-ID HT012912737
    Database Central Library of Sport Science of the German Sport University Cologne

    More links

    Kategorien

  7. Article: Analysis of the CD33-related siglec family reveals that Siglec-9 is an endocytic receptor expressed on subsets of acute myeloid leukemia cells and absent from normal hematopoietic progenitors.

    Biedermann, Bjoern / Gil, Diana / Bowen, David T / Crocker, Paul R

    Leukemia research

    2007  Volume 31, Issue 2, Page(s) 211–220

    Abstract: CD33 (Siglec-3) is expressed on most acute myeloid leukemia (AML) cells and is currently being exploited as a therapeutic target. The purpose of this study was to investigate the expression pattern and potential utility of the seven recently described ... ...

    Abstract CD33 (Siglec-3) is expressed on most acute myeloid leukemia (AML) cells and is currently being exploited as a therapeutic target. The purpose of this study was to investigate the expression pattern and potential utility of the seven recently described CD33-related siglecs as markers in AML. Besides CD33, Siglec-9 was the most highly expressed, particularly on AML cells with features of monocytic differentiation that also expressed Siglecs-5 and -7. Siglec-9 was absent from normal bone marrow myeloid progenitors but present on monocytic precursors. Using primary AML cells or transfected rat basophilic leukemia cells, Siglec-9 mediated rapid endocytosis of anti-Siglec-9 mAb. In contrast to CD33 and Siglec-5, levels of soluble Siglec-9 were low or undetectable in bone marrow plasma from AML patients and serum from normal donors. These features suggest that Siglec-9 provides not only a useful marker for certain subsets of AML, but also a potential therapeutic target.
    MeSH term(s) Acute Disease ; Antigens, CD/analysis ; Antigens, CD/biosynthesis ; Antigens, Differentiation, Myelomonocytic/analysis ; Antigens, Differentiation, Myelomonocytic/biosynthesis ; Biomarkers, Tumor/analysis ; Biomarkers, Tumor/biosynthesis ; Flow Cytometry/methods ; Hematopoietic Stem Cells/immunology ; Humans ; Lectins/analysis ; Lectins/biosynthesis ; Leukemia, Myeloid/immunology ; Sialic Acid Binding Ig-like Lectin 3 ; Sialic Acid Binding Immunoglobulin-like Lectins
    Chemical Substances Antigens, CD ; Antigens, Differentiation, Myelomonocytic ; Biomarkers, Tumor ; CD33 protein, human ; Lectins ; SIGLEC5 protein, human ; SIGLEC7 protein, human ; SIGLEC9 protein, human ; Sialic Acid Binding Ig-like Lectin 3 ; Sialic Acid Binding Immunoglobulin-like Lectins
    Language English
    Publishing date 2007-02
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 752396-8
    ISSN 1873-5835 ; 0145-2126
    ISSN (online) 1873-5835
    ISSN 0145-2126
    DOI 10.1016/j.leukres.2006.05.026
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Factory packed and expired - about emergency insect sting kits.

    Fischer, Jörg / Knaudt, Björn / Caroli, Ulrich M / Biedermann, Tilo

    Journal der Deutschen Dermatologischen Gesellschaft = Journal of the German Society of Dermatology : JDDG

    2008  Volume 6, Issue 9, Page(s) 729–733

    Abstract: Background: Patients allergic to insect venom are instructed to always carry emergency medication-an emergency kit. According to the current guidelines, these emergency kits should contain a H1-receptor-blocking antihistamine and corticosteroid for oral ...

    Abstract Background: Patients allergic to insect venom are instructed to always carry emergency medication-an emergency kit. According to the current guidelines, these emergency kits should contain a H1-receptor-blocking antihistamine and corticosteroid for oral use, as well as an epinephrine inhaler and in particular situations an epinephrine auto-injector.
    Patients and methods: For quality management reasons patients with wasp venom allergy who presented for sting challenge provocation test were told to demonstrate their emergency kits. Concomitantly, constituents of the patient's emergency kits were checked for date of expiry of the medication and the patients were interviewed on storage and use of the emergency kits.
    Results: In total 42 patients with a median duration time of systemic immunotherapy of 2.5 year were evaluated. Medication post date of expiration was found in 54% of the kits (n = 39). Only 31% of the patients could demonstrate how to use the kits correctly. Problems were especially evident concerning for using the application of the inhaler and auto-injector. 50% of the patients demonstrated using epinephrine auto-injectors in such way that an accidental injection into the fingers would have resulted.
    Conclusion: To assure safe and effective handling of all components of the emergency kit, continuous training and repeated supervised practice is necessary.
    MeSH term(s) Adolescent ; Adult ; Aged ; Anaphylaxis/prevention & control ; Animals ; Bites and Stings/epidemiology ; Bites and Stings/therapy ; Child ; Drug Packaging/statistics & numerical data ; Drug Stability ; Drug Storage ; Emergency Medical Services/statistics & numerical data ; Female ; First Aid/instrumentation ; First Aid/methods ; Germany/epidemiology ; Humans ; Male ; Middle Aged ; Wasps ; Young Adult
    Language German
    Publishing date 2008-09
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2093479-8
    ISSN 1610-0387 ; 1610-0379
    ISSN (online) 1610-0387
    ISSN 1610-0379
    DOI 10.1111/j.1610-0387.2008.06650.x
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Translational repression of cyclin E prevents precocious mitosis and embryonic gene activation during C. elegans meiosis.

    Biedermann, Bjoern / Wright, Jane / Senften, Mathias / Kalchhauser, Irene / Sarathy, Gautham / Lee, Min-Ho / Ciosk, Rafal

    Developmental cell

    2009  Volume 17, Issue 3, Page(s) 355–364

    Abstract: Germ cells, the cells that give rise to sperm and egg, maintain the potential to recreate all cell types in a new individual. This wide developmental potential, or totipotency, is manifested in unusual tumors called teratomas, in which germ cells undergo ...

    Abstract Germ cells, the cells that give rise to sperm and egg, maintain the potential to recreate all cell types in a new individual. This wide developmental potential, or totipotency, is manifested in unusual tumors called teratomas, in which germ cells undergo somatic differentiation. Although recent studies have implicated RNA regulation, the mechanism that normally prevents the loss of germ cell identity remains unexplained. In C. elegans, a teratoma is induced in the absence of the conserved RNA-binding protein GLD-1. Here, we demonstrate that GLD-1 represses translation of CYE-1/cyclin E during meiotic prophase, which prevents germ cells from re-entering mitosis and inducing embryonic-like transcription. We describe a mechanism that prevents precocious mitosis in germ cells undergoing meiosis, propose that this mechanism maintains germ cell identity by delaying the onset of embryonic gene activation until after fertilization, and provide a paradigm for the possible origin of human teratomas.
    MeSH term(s) 3' Untranslated Regions ; Animals ; Animals, Genetically Modified ; Caenorhabditis elegans ; Caenorhabditis elegans Proteins/chemistry ; Caenorhabditis elegans Proteins/physiology ; Cell Cycle ; Cyclin B/metabolism ; Cyclin E/biosynthesis ; Cyclin E/metabolism ; Fertilization ; Gene Expression Regulation ; Germ Cells/metabolism ; Meiosis ; Mitosis ; Models, Biological ; Protein Biosynthesis
    Chemical Substances 3' Untranslated Regions ; Caenorhabditis elegans Proteins ; Cyclin B ; Cyclin E ; GLD-1 protein, C elegans
    Language English
    Publishing date 2009-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2054967-2
    ISSN 1878-1551 ; 1534-5807
    ISSN (online) 1878-1551
    ISSN 1534-5807
    DOI 10.1016/j.devcel.2009.08.003
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: The murine inhibitory receptor mSiglec-E is expressed broadly on cells of the innate immune system whereas mSiglec-F is restricted to eosinophils.

    Zhang, Jiquan Q / Biedermann, Björn / Nitschke, Lars / Crocker, Paul R

    European journal of immunology

    2003  Volume 34, Issue 4, Page(s) 1175–1184

    Abstract: Murine (m) Siglec-E and mSiglec-F are recently discovered murine sialic acid-binding Ig-like lectins with tyrosine-based inhibitory signaling motifs. They are postulated to be the orthologs of human (h) siglec-7, -8 or -9 and siglec-5, respectively. We ... ...

    Abstract Murine (m) Siglec-E and mSiglec-F are recently discovered murine sialic acid-binding Ig-like lectins with tyrosine-based inhibitory signaling motifs. They are postulated to be the orthologs of human (h) siglec-7, -8 or -9 and siglec-5, respectively. We report here the first detailed characterization of mSiglec-E, and compare its expression pattern with mSiglec-F. Similar to hSiglec-7, mSiglec-E preferred alpha 2-8-linked disialic acid over alpha 2-3- and alpha 2-6-linked sialic acids. Using a specific Ab, FACS analysis demonstrated that mSiglec-E was expressed mainly on neutrophils in blood and their immature precursors in bone marrow. mSiglec-E was present on peritoneal cavity macrophages and on subsets of mature NK cells and splenic dendritic cells. mSiglec-E was also found ona novel population of peritoneal cavity B-1a-like cells and a subset of splenic B cells enriched in transitional T2 and marginal zone B cells. In striking contrast to mSiglec-E, mSiglec-F was expressed predominantly on eosinophils in blood and their precursors in the bone marrow. The distinct and largely non-overlapping expression profiles of mSiglec-E and mSiglec-F suggest that they play non-redundant roles in the innate immune system. mSiglec-E is likely to modulate the functions of several types of effector cells, whereas mSiglec-F is likely to be more restricted to eosinophil biology.
    MeSH term(s) Animals ; Antigens, CD/immunology ; Antigens, CD/metabolism ; Antigens, Differentiation, B-Lymphocyte/immunology ; Antigens, Differentiation, B-Lymphocyte/metabolism ; Antigens, Differentiation, Myelomonocytic/immunology ; Antigens, Differentiation, Myelomonocytic/metabolism ; B-Lymphocytes/immunology ; B-Lymphocytes/metabolism ; Base Sequence ; Bone Marrow Cells/immunology ; Bone Marrow Cells/metabolism ; Dendritic Cells/immunology ; Dendritic Cells/metabolism ; Eosinophils/immunology ; Eosinophils/metabolism ; Flow Cytometry ; Humans ; Immunity, Innate ; Killer Cells, Natural/immunology ; Killer Cells, Natural/metabolism ; Macrophages/immunology ; Macrophages/metabolism ; Mice ; Molecular Sequence Data ; Neutrophils/immunology ; Neutrophils/metabolism ; Peritoneal Cavity/cytology ; Sequence Homology, Nucleic Acid ; Spleen/cytology ; Spleen/immunology ; Stem Cells/immunology ; Stem Cells/metabolism
    Chemical Substances Antigens, CD ; Antigens, Differentiation, B-Lymphocyte ; Antigens, Differentiation, Myelomonocytic ; Siglece protein, mouse ; Siglecf protein, mouse
    Language English
    Publishing date 2003-10-08
    Publishing country Germany
    Document type Comparative Study ; Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 120108-6
    ISSN 1521-4141 ; 0014-2980
    ISSN (online) 1521-4141
    ISSN 0014-2980
    DOI 10.1002/eji.200324723
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top