LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 140

Search options

  1. Article ; Online: Mass cytometry and type 1 diabetes research in the age of single-cell data science.

    Rahman, Adeeb H / Homann, Dirk

    Current opinion in endocrinology, diabetes, and obesity

    2020  Volume 27, Issue 4, Page(s) 231–239

    Abstract: Purpose of review: New single-cell tec. hnologies developed over the past decade have considerably reshaped the biomedical research landscape, and more recently have found their way into studies probing the pathogenesis of type 1 diabetes (T1D). In this ...

    Abstract Purpose of review: New single-cell tec. hnologies developed over the past decade have considerably reshaped the biomedical research landscape, and more recently have found their way into studies probing the pathogenesis of type 1 diabetes (T1D). In this context, the emergence of mass cytometry in 2009 revolutionized immunological research in two fundamental ways that also affect the T1D world: first, its ready embrace by the community and rapid dissemination across academic and private science centers alike established a new standard of analytical complexity for the high-dimensional proteomic stratification of single-cell populations; and second, the somewhat unexpected arrival of mass cytometry awoke the flow cytometry field from its seeming sleeping beauty stupor and precipitated substantial technological advances that by now approach a degree of analytical dimensionality comparable to mass cytometry.
    Recent findings: Here, we summarize in detail how mass cytometry has thus far been harnessed for the pursuit of discovery studies in T1D science; we provide a succinct overview of other single-cell analysis platforms that already have been or soon will be integrated into various T1D investigations; and we briefly consider how effective adoption of these technologies requires an adjusted model for expense allocation, prioritization of experimental questions, division of labor, and recognition of scientific contributions.
    Summary: The introduction of contemporary single-cell technologies in general, and of mass cytometry, in particular, provides important new opportunities for current and future T1D research; the necessary reconfiguration of research strategies to accommodate implementation of these technologies, however, may both broaden research endeavors by fostering genuine team science, and constrain their actual practice because of the need for considerable investments into infrastructure and technical expertise.
    MeSH term(s) Animals ; Biomedical Research/history ; Biomedical Research/methods ; Biomedical Research/trends ; Data Science/history ; Data Science/methods ; Data Science/trends ; Diabetes Mellitus, Type 1/etiology ; Diabetes Mellitus, Type 1/pathology ; Flow Cytometry/history ; Flow Cytometry/methods ; Flow Cytometry/trends ; History, 21st Century ; Humans ; Mass Spectrometry/history ; Mass Spectrometry/methods ; Mass Spectrometry/trends ; Proteomics/history ; Proteomics/methods ; Proteomics/trends ; Single-Cell Analysis/history ; Single-Cell Analysis/methods ; Single-Cell Analysis/trends
    Language English
    Publishing date 2020-07-03
    Publishing country England
    Document type Historical Article ; Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2272017-0
    ISSN 1752-2978 ; 1752-296X
    ISSN (online) 1752-2978
    ISSN 1752-296X
    DOI 10.1097/MED.0000000000000549
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Mass Cytometry Analysis of Whole Blood Response to an Allergen.

    Geanon, Daniel / Agashe, Charuta / Rahman, Adeeb / Berin, M Cecilia

    Methods in molecular biology (Clifton, N.J.)

    2022  Volume 2506, Page(s) 269–280

    Abstract: Mass cytometry allows for the use of highly multiplexed antibody panels due to the lack of spill-over between channels detected by mass spectrometry. An advantage over fluorescence cytometry is the relative lack of background, which provides excellent ... ...

    Abstract Mass cytometry allows for the use of highly multiplexed antibody panels due to the lack of spill-over between channels detected by mass spectrometry. An advantage over fluorescence cytometry is the relative lack of background, which provides excellent resolution for detection of phosphoproteins and quantification of cell signaling. We have applied mass cytometry to the analysis of whole blood staining after ex vivo stimulation with peanut allergen (Tordesillas et al., J Allergy Clin Immunol 138:1741-4.e9, 2016). This allows for high-dimensional analysis of basophil activation, and analysis of the entire composition of the blood compartment in response to allergen exposure. Here, we describe our optimized protocol for activation and staining of whole blood for mass cytometry analysis that is currently in use in multicenter clinical trials. The protocol can be easily adopted to analyze blood leukocytes in other diseases, including asthma.
    MeSH term(s) Allergens ; Asthma ; Basophils ; Flow Cytometry/methods ; Humans ; Staining and Labeling
    Chemical Substances Allergens
    Language English
    Publishing date 2022-06-30
    Publishing country United States
    Document type Journal Article ; Multicenter Study ; Research Support, N.I.H., Extramural
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-0716-2364-0_19
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Acquisition, Processing, and Quality Control of Mass Cytometry Data.

    Lee, Brian H / Rahman, Adeeb H

    Methods in molecular biology (Clifton, N.J.)

    2019  Volume 1989, Page(s) 13–31

    Abstract: Mass cytometry uniquely combines the principles of mass spectrometry and flow cytometry for high dimensional profiling of immune cells at a single cell level. Using isotopically conjugated antibodies, mass cytometry overcomes the limitations of spectral ... ...

    Abstract Mass cytometry uniquely combines the principles of mass spectrometry and flow cytometry for high dimensional profiling of immune cells at a single cell level. Using isotopically conjugated antibodies, mass cytometry overcomes the limitations of spectral overlap associated with flow cytometry and allows for deeper single cell characterization of complex biospecimens using more cellular markers. However, the nature of mass spectrometry-based single cell measurements requires specific considerations in acquiring and processing data. This chapter provides an overview of how to optimally acquire mass cytometry data and how to process this data for subsequent analysis and characterization of cell populations.
    MeSH term(s) Biomarkers/analysis ; Cells/cytology ; Flow Cytometry/methods ; Humans ; Mass Spectrometry/methods ; Quality Control ; Single-Cell Analysis/methods ; Staining and Labeling/methods
    Chemical Substances Biomarkers
    Language English
    Publishing date 2019-05-10
    Publishing country United States
    Document type Journal Article
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-4939-9454-0_2
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Influence of virus-host interactions on plant response to abiotic stress.

    Rahman, Adeeb / Sinha, Kumari Veena / Sopory, Sudhir K / Sanan-Mishra, Neeti

    Plant cell reports

    2021  Volume 40, Issue 11, Page(s) 2225–2245

    Abstract: Environmental factors play a significant role in controlling growth, development and defense responses of plants. Changes in the abiotic environment not only significantly alter the physiological and molecular pathways in plants, but also result in ... ...

    Abstract Environmental factors play a significant role in controlling growth, development and defense responses of plants. Changes in the abiotic environment not only significantly alter the physiological and molecular pathways in plants, but also result in attracting the insect pests that carry a payload of viruses. Invasion of plants by viruses triggers the RNA silencing based defense mechanism in plants. In counter defense the viruses have gained the ability to suppress the host RNA silencing activities. A new paradigm has emerged, with the recognition that plant viruses also have the intrinsic capacity to modulate host plant response to environmental cues, in an attempt to favour their own survival. Thus, plant-virus interactions provide an excellent system to understand the signals in crosstalk between biotic (virus) and abiotic stresses. In this review, we have summarized the basal plant defense responses to pathogen invasion while emphasizing on the role of RNA silencing as a front line of defense response to virus infection. The emerging knowledge indicates overlap between RNA silencing with the innate immune responses during antiviral defense. The suppressors of RNA silencing serve as Avr proteins, which can be recognized by the host R proteins. The defense signals also function in concert with the phytohormones to influence plant responses to abiotic stresses. The current evidence on the role of virus induced host tolerance to abiotic stresses is also discussed.
    MeSH term(s) Host-Pathogen Interactions/physiology ; Plant Diseases/genetics ; Plant Diseases/immunology ; Plant Diseases/virology ; Plant Growth Regulators/metabolism ; Plant Immunity ; Plant Physiological Phenomena ; Plant Viruses/pathogenicity ; Plants/genetics ; Plants/immunology ; Plants/virology ; RNA, Plant ; Stress, Physiological/physiology
    Chemical Substances Plant Growth Regulators ; RNA, Plant
    Language English
    Publishing date 2021-05-29
    Publishing country Germany
    Document type Journal Article ; Review
    ZDB-ID 8397-5
    ISSN 1432-203X ; 0721-085X ; 0721-7714
    ISSN (online) 1432-203X
    ISSN 0721-085X ; 0721-7714
    DOI 10.1007/s00299-021-02718-0
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Flow cytometric methods for the assessment of allergic disease.

    Rahman, Adeeb H

    Methods in molecular biology (Clifton, N.J.)

    2013  Volume 1032, Page(s) 297–313

    Abstract: Multiparametric flow cytometry is a powerful technique that allows the quantification and characterization of heterogeneous populations of cells. Advances in flow cytometric instrumentation, software, and reagents are occurring at a rapid pace, and flow ... ...

    Abstract Multiparametric flow cytometry is a powerful technique that allows the quantification and characterization of heterogeneous populations of cells. Advances in flow cytometric instrumentation, software, and reagents are occurring at a rapid pace, and flow cytometric methods are increasingly being applied to better understand cellular responses associated with a diverse array of disease conditions. This chapter provides an overview of some common applications of flow cytometry in characterizing mouse models of allergic airway disease.
    MeSH term(s) Allergens/immunology ; Animals ; Disease Models, Animal ; Flow Cytometry/methods ; Humans ; Hypersensitivity/immunology ; Hypersensitivity/pathology ; Mice
    Chemical Substances Allergens
    Language English
    Publishing date 2013
    Publishing country United States
    Document type Journal Article
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-62703-496-8_23
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article: Experimental Validation and Evaluation of the Bending Properties of Additively Manufactured Metallic Cellular Scaffold Structures for Bone Tissue Engineering.

    Al-Barqawi, Mohammad O / Church, Benjamin / Thevamaran, Mythili / Thoma, Dan J / Rahman, Adeeb

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 10

    Abstract: The availability of additive manufacturing enables the fabrication of cellular bone tissue engineering scaffolds with a wide range of structural and architectural possibilities. The purpose of bone tissue engineering scaffolds is to repair critical size ... ...

    Abstract The availability of additive manufacturing enables the fabrication of cellular bone tissue engineering scaffolds with a wide range of structural and architectural possibilities. The purpose of bone tissue engineering scaffolds is to repair critical size bone defects due to extreme traumas, tumors, or infections. This research study presented the experimental validation and evaluation of the bending properties of optimized bone scaffolds with an elastic modulus that is equivalent to the young's modulus of the cortical bone. The specimens were manufactured using laser powder bed fusion technology. The morphological properties of the manufactured specimens were evaluated using both dry weighing and Archimedes techniques, and minor variations in the relative densities were observed in comparison with the computer-aided design files. The bending modulus of the cubic and diagonal scaffolds were experimentally investigated using a three-point bending test, and the results were found to agree with the numerical findings. A higher bending modulus was observed in the diagonal scaffold design. The diagonal scaffold was substantially tougher, with considerably higher energy absorption before fracture. The shear modulus of the diagonal scaffold was observed to be significantly higher than the cubic scaffold. Due to bending, the pores at the top side of the diagonal scaffold were heavily compressed compared to the cubic scaffold due to the extensive plastic deformation occurring in diagonal scaffolds and the rapid fracture of struts in the tension side of the cubic scaffold. The failure in struts in tension showed signs of ductility as necking was observed in fractured struts. Moreover, the fractured surface was observed to be rough and dull as opposed to being smooth and bright like in brittle fractures. Dimple fracture was observed using scanning electron microscopy as a result of microvoids emerging in places of high localized plastic deformation. Finally, a comparison of the mechanical properties of the studied BTE scaffolds with the cortical bone properties under longitudinal and transverse loading was investigated. In conclusion, we showed the capabilities of finite element analysis and additive manufacturing in designing and manufacturing promising scaffold designs that can replace bone segments in the human body.
    Language English
    Publishing date 2022-05-11
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15103447
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article: Design and Validation of Additively Manufactured Metallic Cellular Scaffold Structures for Bone Tissue Engineering.

    Al-Barqawi, Mohammad O / Church, Benjamin / Thevamaran, Mythili / Thoma, Dan J / Rahman, Adeeb

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 9

    Abstract: Bone-related defects that cannot heal without significant surgical intervention represent a significant challenge in the orthopedic field. The use of implants for these critical-sized bone defects is being explored to address the limitations of autograft ...

    Abstract Bone-related defects that cannot heal without significant surgical intervention represent a significant challenge in the orthopedic field. The use of implants for these critical-sized bone defects is being explored to address the limitations of autograft and allograft options. Three-dimensional cellular structures, or bone scaffolds, provide mechanical support and promote bone tissue formation by acting as a template for bone growth. Stress shielding in bones is the reduction in bone density caused by the difference in stiffness between the scaffold and the surrounding bone tissue. This study aimed to reduce the stress shielding and introduce a cellular metal structure to replace defected bone by designing and producing a numerically optimized bone scaffold with an elastic modulus of 15 GPa, which matches the human's cortical bone modulus. Cubic cell and diagonal cell designs were explored. Strut and cell dimensions were numerically optimized to achieve the desired structural modulus. The resulting scaffold designs were produced from stainless steel using laser powder bed fusion (LPBF). Finite element analysis (FEA) models were validated through compression testing of the printed scaffold designs. The structural configuration of the scaffolds was characterized with scanning electron microscopy (SEM). Cellular struts were found to have minimal internal porosity and rough surfaces. Strut dimensions of the printed scaffolds were found to have variations with the optimized computer-aided design (CAD) models. The experimental results, as expected, were slightly less than FEA results due to structural relative density variations in the scaffolds. Failure of the structures was stretch-dominated for the cubic scaffold and bending-dominated for the diagonal scaffold. The torsional and bending stiffnesses were numerically evaluated and showed higher bending and torsional moduli for the diagonal scaffold. The study successfully contributed to minimizing stress shielding in bone tissue engineering. The study also produced an innovative metal cellular structure that can replace large bone segments anywhere in the human body.
    Language English
    Publishing date 2022-05-05
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15093310
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Imprinted immune abnormalities in liver transplant patients cured of hepatitis C with antiviral drugs.

    Doyle, Erin H / Aloman, Costica / El-Shamy, Ahmed / Eng, Francis J / Kim-Schulze, Seunghee / Rahman, Adeeb / Schiano, Thomas / Heeger, Peter / Branch, Andrea D

    Liver transplantation : official publication of the American Association for the Study of Liver Diseases and the International Liver Transplantation Society

    2024  

    Abstract: Chronic HCV infection induces interferon and dysregulates immune responses through inflammation and chronic antigenic stimulation. Antiviral drugs can cure HCV, providing a unique opportunity to examine the immunological restoration that does and does ... ...

    Abstract Chronic HCV infection induces interferon and dysregulates immune responses through inflammation and chronic antigenic stimulation. Antiviral drugs can cure HCV, providing a unique opportunity to examine the immunological restoration that does and does not occur when a chronic viral infection is eradicated. We quantified blood cytokines levels and used mass cytometry to immunophenotype peripheral blood mononuclear cells before and after HCV cure in 2 groups of patients and controls. At baseline, serum interferon α and soluble CD163 (a macrophage product) were elevated in both liver transplant and nonliver transplant patients compared to controls; the frequencies of several peripheral blood mononuclear cell populations differed from controls; and programmed death protein 1-positivity was increased in nearly all T cell subsets. Many abnormalities persisted after HCV cure, including elevated programmed death protein 1 expression on CD4 naïve and central memory T cells, elevated soluble CD163, and expansion of the plasmablast/plasma cell compartment. Several myeloid-lineage subsets, including Ag-presenting dendritic cells, remained dysregulated. In mechanistic studies, interferon α treatment increased programmed death protein 1 on human T cells and increased T cell receptor signaling. The data identify immunological abnormalities that persist after curative HCV treatment. Before cure, high levels of interferon α may stimulate programmed death protein 1 expression on human T cells, causing persistent functional changes.
    Language English
    Publishing date 2024-02-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2006866-9
    ISSN 1527-6473 ; 1527-6465
    ISSN (online) 1527-6473
    ISSN 1527-6465
    DOI 10.1097/LVT.0000000000000342
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article: Influence of virus–host interactions on plant response to abiotic stress

    Rahman, Adeeb / Sinha, Kumari Veena / Sopory, Sudhir K. / Sanan-Mishra, Neeti

    Plant cell reports. 2021 Nov., v. 40, no. 11

    2021  

    Abstract: Environmental factors play a significant role in controlling growth, development and defense responses of plants. Changes in the abiotic environment not only significantly alter the physiological and molecular pathways in plants, but also result in ... ...

    Abstract Environmental factors play a significant role in controlling growth, development and defense responses of plants. Changes in the abiotic environment not only significantly alter the physiological and molecular pathways in plants, but also result in attracting the insect pests that carry a payload of viruses. Invasion of plants by viruses triggers the RNA silencing based defense mechanism in plants. In counter defense the viruses have gained the ability to suppress the host RNA silencing activities. A new paradigm has emerged, with the recognition that plant viruses also have the intrinsic capacity to modulate host plant response to environmental cues, in an attempt to favour their own survival. Thus, plant–virus interactions provide an excellent system to understand the signals in crosstalk between biotic (virus) and abiotic stresses. In this review, we have summarized the basal plant defense responses to pathogen invasion while emphasizing on the role of RNA silencing as a front line of defense response to virus infection. The emerging knowledge indicates overlap between RNA silencing with the innate immune responses during antiviral defense. The suppressors of RNA silencing serve as Avr proteins, which can be recognized by the host R proteins. The defense signals also function in concert with the phytohormones to influence plant responses to abiotic stresses. The current evidence on the role of virus induced host tolerance to abiotic stresses is also discussed.
    Keywords RNA ; abiotic stress ; host plants ; plant hormones ; plant response ; viruses
    Language English
    Dates of publication 2021-11
    Size p. 2225-2245.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    Note Review
    ZDB-ID 8397-5
    ISSN 1432-203X ; 0721-085X ; 0721-7714
    ISSN (online) 1432-203X
    ISSN 0721-085X ; 0721-7714
    DOI 10.1007/s00299-021-02718-0
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  10. Article ; Online: Introduction to the Special Issue.

    Rahman, Adeeb H / O'Gorman, Maurice R G

    Journal of immunological methods

    2018  Volume 453, Page(s) 1–2

    MeSH term(s) Animals ; Cell Separation ; Flow Cytometry/methods ; Fluorescent Antibody Technique ; High-Throughput Screening Assays ; Humans ; Mass Spectrometry/methods ; Single-Cell Analysis
    Language English
    Publishing date 2018-04-26
    Publishing country Netherlands
    Document type Editorial ; Introductory Journal Article
    ZDB-ID 120142-6
    ISSN 1872-7905 ; 0022-1759
    ISSN (online) 1872-7905
    ISSN 0022-1759
    DOI 10.1016/j.jim.2018.01.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top