LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 53

Search options

  1. Article ; Online: High-throughput quantification of red blood cell deformability and oxygen saturation to probe mechanisms of sickle cell disease.

    Williams, Dillon C / Wood, David K

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 120, Issue 48, Page(s) e2313755120

    Abstract: The complex, systemic pathology of sickle cell disease is driven by multiple mechanisms including red blood cells (RBCs) stiffened by polymerized fibers of deoxygenated sickle hemoglobin. A critical step toward understanding the pathologic role of ... ...

    Abstract The complex, systemic pathology of sickle cell disease is driven by multiple mechanisms including red blood cells (RBCs) stiffened by polymerized fibers of deoxygenated sickle hemoglobin. A critical step toward understanding the pathologic role of polymer-containing RBCs is quantifying the biophysical changes in these cells in physiologically relevant oxygen environments. We have developed a microfluidic platform capable of simultaneously measuring single RBC deformability and oxygen saturation under controlled oxygen and shear stress. We found that RBCs with detectable amounts of polymer have decreased oxygen affinity and decreased deformability. Surprisingly, the deformability of the polymer-containing cells is oxygen-independent, while the fraction of these cells increases as oxygen decreases. We also find that some fraction of these cells is present at most physiologic oxygen tensions, suggesting a role for these cells in the systemic pathologies. Additionally, the ability to measure these pathological cells should provide clearer targets for evaluating therapies.
    MeSH term(s) Humans ; Oxygen Saturation ; Anemia, Sickle Cell ; Erythrocytes ; Erythrocyte Deformability ; Polymers ; Oxygen
    Chemical Substances Polymers ; Oxygen (S88TT14065)
    Language English
    Publishing date 2023-11-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2313755120
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Simultaneous quantification of blood rheology and oxygen saturation to evaluate affinity-modifying therapies in sickle cell disease.

    Hansen, Scott / Wood, David K

    Lab on a chip

    2022  Volume 22, Issue 21, Page(s) 4141–4150

    Abstract: Sickle cell blood demonstrates oxygen-dependent flow behavior as a result of HbS polymerization during hypoxia, and these rheological changes provide a biophysical metric that can be used to quantify the pathological behavior of the blood. Relating these ...

    Abstract Sickle cell blood demonstrates oxygen-dependent flow behavior as a result of HbS polymerization during hypoxia, and these rheological changes provide a biophysical metric that can be used to quantify the pathological behavior of the blood. Relating these rheological changes directly to hemoglobin oxygen saturation would improve our understanding of SCD pathogenesis and the potential effects of therapeutic drugs. Towards this end, we have developed a microfluidic platform capable of spectrophotometric quantification of Hb-O
    MeSH term(s) Humans ; Oxygen Saturation ; Anemia, Sickle Cell/drug therapy ; Oxygen ; Rheology ; Hemoglobins ; Hemoglobin, Sickle/metabolism ; Hemoglobin, Sickle/therapeutic use
    Chemical Substances voxelotor (3ZO554A4Q8) ; Oxygen (S88TT14065) ; Hemoglobins ; Hemoglobin, Sickle
    Language English
    Publishing date 2022-10-25
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, N.I.H., Extramural
    ZDB-ID 2056646-3
    ISSN 1473-0189 ; 1473-0197
    ISSN (online) 1473-0189
    ISSN 1473-0197
    DOI 10.1039/d2lc00623e
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: A scalable 3D tissue culture pipeline to enable functional therapeutic screening for pulmonary fibrosis.

    Cummins, Katherine A / Bitterman, Peter B / Tschumperlin, Daniel J / Wood, David K

    APL bioengineering

    2021  Volume 5, Issue 4, Page(s) 46102

    Abstract: Idiopathic pulmonary fibrosis (IPF) is a lethal lung disease targeting the alveolar gas exchange apparatus, leading to death by asphyxiation. IPF progresses on a tissue scale through aberrant matrix remodeling, enhanced cell contraction, and subsequent ... ...

    Abstract Idiopathic pulmonary fibrosis (IPF) is a lethal lung disease targeting the alveolar gas exchange apparatus, leading to death by asphyxiation. IPF progresses on a tissue scale through aberrant matrix remodeling, enhanced cell contraction, and subsequent microenvironment densification. Although two pharmaceuticals modestly slow progression, IPF patient survival averages less than 5 years. A major impediment to therapeutic development is the lack of high-fidelity models that account for the fibrotic microenvironment. Our goal is to create a three-dimensional (3D) platform to enable lung fibrosis studies and recapitulate IPF tissue features. We demonstrate that normal lung fibroblasts encapsulated in collagen microspheres can be pushed toward an activated phenotype, treated with FDA-approved therapies, and their fibrotic function quantified using imaging assays (extracellular matrix deposition, contractile protein expression, and microenvironment compaction). Highlighting the system's utility, we further show that fibroblasts isolated from IPF patient lungs maintain fibrotic phenotypes and manifest reduced fibrotic function when treated with epigenetic modifiers. Our system enables enhanced screening due to improved predictability and fidelity compared to 2D systems combined with superior tractability and throughput compared to 3D systems.
    Language English
    Publishing date 2021-11-16
    Publishing country United States
    Document type Journal Article
    ISSN 2473-2877
    ISSN (online) 2473-2877
    DOI 10.1063/5.0054967
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Extracellular Vesicles Mediate the Intercellular Exchange of Nanoparticles.

    Wu, Xian / Tang, Tang / Wei, Yushuang / Cummins, Katherine A / Wood, David K / Pang, Hong-Bo

    Advanced science (Weinheim, Baden-Wurttemberg, Germany)

    2022  Volume 9, Issue 7, Page(s) e2102441

    Abstract: To exert their therapeutic effects, nanoparticles (NPs) often need to travel into the tissues composed of multilayered cells. Accumulative evidence has revealed the crucial role of transcellular transport route (entry into one cell, exocytosis, and re- ... ...

    Abstract To exert their therapeutic effects, nanoparticles (NPs) often need to travel into the tissues composed of multilayered cells. Accumulative evidence has revealed the crucial role of transcellular transport route (entry into one cell, exocytosis, and re-entry into another) in this process. While NP endocytosis and subcellular transport are intensively characterized, the exocytosis and re-entry steps are poorly understood, which becomes a barrier for NP delivery into complex tissues. Here, the authors term the exocytosis and re-entry steps together as intercellular exchange. A collagen-based three-dimension assay is developed to specifically quantify the intercellular exchange of NPs, and distinguish the contributions of several potential mechanisms. The authors show that NPs can be exocytosed freely or enclosed inside extracellular vesicles (EVs) for re-entry, while direct cell-cell contact is hardly involved. EVs account for a significant fraction of NP intercellular exchange, and its importance in NP transport is demonstrated in vitro and in vivo. While freely released NPs engage with the same receptors for re-entry, EV-enclosed ones bypass this dependence. These studies provide an easy and precise system to investigate the intercellular exchange stage of NP delivery, and shed the first light in the importance of EVs in NP transport between cells and into complex tissues.
    MeSH term(s) Endocytosis ; Exocytosis ; Extracellular Vesicles/metabolism ; Nanoparticles ; Transcytosis
    Language English
    Publishing date 2022-01-17
    Publishing country Germany
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 2808093-2
    ISSN 2198-3844 ; 2198-3844
    ISSN (online) 2198-3844
    ISSN 2198-3844
    DOI 10.1002/advs.202102441
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Microfluidic methods to advance mechanistic understanding and translational research in sickle cell disease.

    Azul, Melissa / Vital, Eudorah F / Lam, Wilbur A / Wood, David K / Beckman, Joan D

    Translational research : the journal of laboratory and clinical medicine

    2022  Volume 246, Page(s) 1–14

    Abstract: Sickle cell disease (SCD) is caused by a single point mutation in the β-globin gene of hemoglobin, which produces an altered sickle hemoglobin (HbS). The ability of HbS to polymerize under deoxygenated conditions gives rise to chronic hemolysis, ... ...

    Abstract Sickle cell disease (SCD) is caused by a single point mutation in the β-globin gene of hemoglobin, which produces an altered sickle hemoglobin (HbS). The ability of HbS to polymerize under deoxygenated conditions gives rise to chronic hemolysis, oxidative stress, inflammation, and vaso-occlusion. Herein, we review recent findings using microfluidic technologies that have elucidated mechanisms of oxygen-dependent and -independent induction of HbS polymerization and how these mechanisms elicit the biophysical and inflammatory consequences in SCD pathophysiology. We also discuss how validation and use of microfluidics in SCD provides the opportunity to advance development of numerous therapeutic strategies, including curative gene therapies.
    MeSH term(s) Anemia, Sickle Cell/drug therapy ; Anemia, Sickle Cell/therapy ; Hemoglobin, Sickle ; Hemolysis ; Humans ; Microfluidics ; Translational Research, Biomedical
    Chemical Substances Hemoglobin, Sickle
    Language English
    Publishing date 2022-03-27
    Publishing country United States
    Document type Journal Article ; Review ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S. ; Research Support, N.I.H., Extramural
    ZDB-ID 2246684-8
    ISSN 1878-1810 ; 1532-6543 ; 1931-5244
    ISSN (online) 1878-1810 ; 1532-6543
    ISSN 1931-5244
    DOI 10.1016/j.trsl.2022.03.010
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: Rapid and inefficient kinetics of sickle hemoglobin fiber growth.

    Castle, Brian T / Odde, David J / Wood, David K

    Science advances

    2019  Volume 5, Issue 3, Page(s) eaau1086

    Abstract: In sickle cell disease, the aberrant assembly of hemoglobin fibers induces changes in red blood cell morphology and stiffness, which leads to downstream symptoms of the disease. Therefore, understanding of this assembly process will be important for the ... ...

    Abstract In sickle cell disease, the aberrant assembly of hemoglobin fibers induces changes in red blood cell morphology and stiffness, which leads to downstream symptoms of the disease. Therefore, understanding of this assembly process will be important for the treatment of sickle cell disease. By performing the highest spatiotemporal resolution measurements (55 nm at 1 Hz) of single sickle hemoglobin fiber assembly to date and combining them with a model that accounts for the multistranded structure of the fibers, we show that the rates of sickle hemoglobin addition and loss have been underestimated in the literature by at least an order of magnitude. These results reveal that the sickle hemoglobin self-assembly process is very rapid and inefficient (4% efficient versus 96% efficient based on previous analyses), where net growth is the small difference between over a million addition-loss events occurring every second.
    MeSH term(s) Anemia, Sickle Cell/blood ; Buffers ; Erythrocytes/chemistry ; Hemoglobin, Sickle/chemistry ; Hemoglobin, Sickle/ultrastructure ; Humans ; Image Processing, Computer-Assisted/statistics & numerical data ; Microscopy, Interference/methods ; Solutions ; Sulfites/chemistry
    Chemical Substances Buffers ; Hemoglobin, Sickle ; Solutions ; Sulfites ; sodium metabisulfite (4VON5FNS3C)
    Language English
    Publishing date 2019-03-13
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.aau1086
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: 5-(Hydroxymethyl)furfural restores low-oxygen rheology of sickle trait blood in vitro.

    Hansen, Scott / Wood, David K / Higgins, John M

    British journal of haematology

    2019  Volume 188, Issue 6, Page(s) 985–993

    Abstract: Sickle cell trait (SCT) is the benign heterozygous carrier state for the sickle variant of the HBB gene. Most of the ~300 million people with SCT worldwide will not experience any significant complications. However, accumulating evidence finds SCT ... ...

    Abstract Sickle cell trait (SCT) is the benign heterozygous carrier state for the sickle variant of the HBB gene. Most of the ~300 million people with SCT worldwide will not experience any significant complications. However, accumulating evidence finds SCT associated with increased risk for the common conditions of chronic kidney disease and venous thromboembolism, and severe but rare renal medullary carcinoma and exercise-induced rhabdomyolysis. The mechanism is uncertain, but probably involves pathological rheology of SCT blood in regions of low oxygen tension, resulting from sickle haemoglobin polymerization in SCT red cells and leading to reduced blood flow and further tissue hypoxia and damage. Here, we used an in vitro microfluidic flow system to study the oxygen-dependent rheology of SCT blood and show that 5-(hydroxymethyl)furfural, a natural breakdown product of glucose and fructose-containing foods, such as fruit juices, can reduce the effects of hypoxia on SCT blood rheology in vitro, restoring near-normal flow velocities at very low oxygen. While opinions regarding the clinical significance of the risks associated with SCT are still evolving, these results suggest that a compound present in some food may provide a potential approach for managing risks that may be associated with SCT.
    MeSH term(s) Blood Viscosity ; Furaldehyde/analogs & derivatives ; Furaldehyde/pharmacology ; Furaldehyde/therapeutic use ; Humans ; Oxygen/blood ; Rheology ; Sickle Cell Trait/blood ; Sickle Cell Trait/drug therapy
    Chemical Substances 5-hydroxymethylfurfural (70ETD81LF0) ; Furaldehyde (DJ1HGI319P) ; Oxygen (S88TT14065)
    Language English
    Publishing date 2019-12-30
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 80077-6
    ISSN 1365-2141 ; 0007-1048
    ISSN (online) 1365-2141
    ISSN 0007-1048
    DOI 10.1111/bjh.16251
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Microscale Collagen and Fibroblast Interactions Enhance Primary Human Hepatocyte Functions in Three-Dimensional Models.

    Kukla, David A / Crampton, Alexandra L / Wood, David K / Khetani, Salman R

    Gene expression

    2020  Volume 20, Issue 1, Page(s) 1–18

    Abstract: Human liver models that are three-dimensional (3D) in architecture are indispensable for compound metabolism/toxicity screening, to model liver diseases for drug discovery, and for cell-based therapies; however, further development of such models is ... ...

    Abstract Human liver models that are three-dimensional (3D) in architecture are indispensable for compound metabolism/toxicity screening, to model liver diseases for drug discovery, and for cell-based therapies; however, further development of such models is needed to maintain high levels of primary human hepatocyte (PHH) functions for weeks to months. Therefore, here we determined how microscale 3D collagen I presentation and fibroblast interaction affect the longevity of PHHs. High-throughput droplet microfluidics was utilized to generate reproducibly sized (∼300-μm diameter) microtissues containing PHHs encapsulated in collagen I ± supportive fibroblasts, namely, 3T3-J2 murine embryonic fibroblasts or primary human hepatic stellate cells (HSCs); self-assembled spheroids and bulk collagen gels (macrogels) containing PHHs served as controls. Hepatic functions and gene expression were subsequently measured for up to 6 weeks. We found that microtissues placed within multiwell plates rescued PHH functions at 2- to 30-fold higher levels than spheroids or macrogels. Further coating of PHH microtissues with 3T3-J2s led to higher hepatic functions than when the two cell types were either coencapsulated together or when HSCs were used for the coating instead. Importantly, the 3T3-J2-coated PHH microtissues displayed 6+ weeks of relatively stable hepatic gene expression and function at levels similar to freshly thawed PHHs. Lastly, microtissues responded in a clinically relevant manner to drug-mediated cytochrome P450 induction or hepatotoxicity. In conclusion, fibroblast-coated collagen microtissues containing PHHs display high hepatic functions for 6+ weeks and are useful for assessing drug-mediated CYP induction and hepatotoxicity. Ultimately, microtissues may find utility for modeling liver diseases and as building blocks for cell-based therapies.
    MeSH term(s) 3T3 Cells/cytology ; Animals ; Cell Encapsulation ; Cells, Cultured ; Coculture Techniques/methods ; Collagen Type I/chemistry ; Cytochrome P-450 Enzyme System/biosynthesis ; Enzyme Induction/drug effects ; Gels ; Gene Expression ; Hepatic Stellate Cells/cytology ; Hepatocytes/cytology ; Humans ; Lab-On-A-Chip Devices ; Mice ; Omeprazole/pharmacology ; Polymerization ; Rifampin/pharmacology ; Spheroids, Cellular ; Tissue Engineering/instrumentation ; Tissue Engineering/methods
    Chemical Substances Collagen Type I ; Gels ; Cytochrome P-450 Enzyme System (9035-51-2) ; Omeprazole (KG60484QX9) ; Rifampin (VJT6J7R4TR)
    Language English
    Publishing date 2020-04-14
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 1151108-4
    ISSN 1555-3884 ; 1052-2116
    ISSN (online) 1555-3884
    ISSN 1052-2116
    DOI 10.3727/105221620X15868728381608
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: An Experimental-Computational Approach to Quantify Blood Rheology in Sickle Cell Disease.

    Bazzi, Marisa S / Valdez, José M / Barocas, Victor H / Wood, David K

    Biophysical journal

    2020  Volume 119, Issue 11, Page(s) 2307–2315

    Abstract: In sickle cell disease, aberrant blood flow due to oxygen-dependent changes in red cell biomechanics is a key driver of pathology. Most studies to date have focused on the potential role of altered red cell deformability and blood rheology in ... ...

    Abstract In sickle cell disease, aberrant blood flow due to oxygen-dependent changes in red cell biomechanics is a key driver of pathology. Most studies to date have focused on the potential role of altered red cell deformability and blood rheology in precipitating vaso-occlusive crises. Numerous studies, however, have shown that sickle blood flow is affected even at high oxygen tensions, suggesting a potentially systemic role for altered blood flow in driving pathologies, including endothelial dysfunction, ischemia, and stroke. In this study, we applied a combined experimental-computation approach that leveraged an experimental platform that quantifies sickle blood velocity fields under a range of oxygen tensions and shear rates. We computationally fitted a continuum model to our experimental data to generate physics-based parameters that capture patient-specific rheological alterations. Our results suggest that sickle blood flow is altered systemically, from the arterial to the venous circulation. We also demonstrated the application of this approach as a tool to design patient-specific transfusion regimens. Finally, we demonstrated that patient-specific rheological parameters can be combined with patient-derived vascular models to identify patients who are at higher risk for cerebrovascular complications such as aneurysm and stroke. Overall, this study highlights that sickle blood flow is altered systemically, which can drive numerous pathologies, and this study demonstrates the potential utility of an experimentally parameterized continuum model as a predictive tool for patient-specific care.
    MeSH term(s) Anemia, Sickle Cell ; Erythrocyte Deformability ; Erythrocytes ; Humans ; Rheology
    Language English
    Publishing date 2020-10-20
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 218078-9
    ISSN 1542-0086 ; 0006-3495
    ISSN (online) 1542-0086
    ISSN 0006-3495
    DOI 10.1016/j.bpj.2020.10.011
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: A high-throughput microtissue platform to probe endothelial function in vitro.

    Crampton, Alexandra L / Cummins, Katherine A / Wood, David K

    Integrative biology : quantitative biosciences from nano to macro

    2018  Volume 10, Issue 9, Page(s) 555–565

    Abstract: A critical role of vascular endothelium is as a semi-permeable barrier, dynamically regulating the flux of solutes between blood and the surrounding tissue. Existing platforms that quantify endothelial function in vitro are either significantly ... ...

    Abstract A critical role of vascular endothelium is as a semi-permeable barrier, dynamically regulating the flux of solutes between blood and the surrounding tissue. Existing platforms that quantify endothelial function in vitro are either significantly throughput limited or overlook physiologically relevant extracellular matrix (ECM) interactions and thus do not recapitulate in vivo function. Leveraging droplet microfluidics, we developed a scalable platform to measure endothelial function in nanoliter-volume, ECM-based microtissues. In this study, we describe our high-throughput method for fabricating endothelial-coated collagen microtissues that incorporate physiologically relevant cell-ECM interactions. We showed that the endothelial cells had characteristic morphology, expressed tight junction proteins, and remodeled the ECM via compaction and deposition of basement membrane. We also measured macromolecular permeability using two optical modalities, and found the cell layers: (1) had permeability values comparable to in vivo measurements and (2) were responsive to physiologically-relevant modulators of endothelial permeability (TNF-α and TGF-β). This is the first demonstration, to the authors' knowledge, of high-throughput assessment (n > 150) of endothelial permeability on natural ECM. Additionally, this technology is compatible with standard cell culture equipment (e.g. multi-well plates) and could be scaled up further to be integrated with automated liquid handling systems and automated imaging platforms. Overall, this platform recapitulates the functions of traditional transwell inserts, but extends application to high-throughput studies and introduces new possibilities for interrogating cell-cell and cell-matrix interactions.
    MeSH term(s) Animals ; Anisotropy ; Basement Membrane/physiology ; Cell Communication ; Cell Culture Techniques/methods ; Cells, Cultured ; Endothelial Cells/cytology ; Endothelium, Vascular/physiology ; Extracellular Matrix/physiology ; Macromolecular Substances ; Microfluidics ; Permeability ; Rats ; Transforming Growth Factor beta/metabolism ; Tumor Necrosis Factor-alpha/metabolism
    Chemical Substances Macromolecular Substances ; Transforming Growth Factor beta ; Tumor Necrosis Factor-alpha
    Language English
    Publishing date 2018-08-23
    Publishing country England
    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.
    ZDB-ID 2480063-6
    ISSN 1757-9708 ; 1757-9694
    ISSN (online) 1757-9708
    ISSN 1757-9694
    DOI 10.1039/c8ib00111a
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top