LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 159

Search options

  1. Article: Theranostic gold in a gold cage nanoparticle for photothermal ablation and photoacoustic imaging of skin and oral infections.

    Hajfathalian, Maryam / de Vries, Christiaan R / Hsu, Jessica C / Amirshaghaghi, Ahmad / Dong, Yuxi C / Ren, Zhi / Liu, Yuan / Huang, Yue / Li, Yong / Knight, Simon / Jonnalagadda, Pallavi / Zlitni, Aimen / Grice, Elizabeth / Bollyky, Paul L / Koo, Hyun / Cormode, David P

    bioRxiv : the preprint server for biology

    2023  

    Abstract: Biofilms are structured communities of microbial cells embedded in a self-produced matrix of extracellular polymeric substances. Biofilms are associated with many health issues in humans, including chronic wound infections and tooth decay. Current ... ...

    Abstract Biofilms are structured communities of microbial cells embedded in a self-produced matrix of extracellular polymeric substances. Biofilms are associated with many health issues in humans, including chronic wound infections and tooth decay. Current antimicrobials are often incapable of disrupting the polymeric biofilm matrix and reaching the bacteria within. Alternative approaches are needed. Here, we describe a unique structure of dextran coated gold in a gold cage nanoparticle that enables photoacoustic and photothermal properties for biofilm detection and treatment. Activation of these nanoparticles with a near infrared laser can selectively detect and kill biofilm bacteria with precise spatial control and in a short timeframe. We observe a strong biocidal effect against both Streptococcus mutans and Staphylococcus aureus biofilms in mouse models of oral plaque and wound infections respectively. These effects were over 100 times greater than that seen with chlorhexidine, a conventional antimicrobial agent. Moreover, this approach did not adversely affect surrounding tissues. We conclude that photothermal ablation using theranostic nanoparticles is a rapid, precise, and non-toxic method to detect and treat biofilm-associated infections.
    Language English
    Publishing date 2023-05-08
    Publishing country United States
    Document type Preprint
    DOI 10.1101/2023.05.05.539604
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Theranostic gold-in-gold cage nanoparticles enable photothermal ablation and photoacoustic imaging in biofilm-associated infection models.

    Hajfathalian, Maryam / de Vries, Christiaan R / Hsu, Jessica C / Amirshaghaghi, Ahmad / Dong, Yuxi C / Ren, Zhi / Liu, Yuan / Huang, Yue / Li, Yong / Knight, Simon Ab / Jonnalagadda, Pallavi / Zlitni, Aimen / Grice, Elizabeth A / Bollyky, Paul L / Koo, Hyun / Cormode, David P

    The Journal of clinical investigation

    2023  Volume 133, Issue 21

    Abstract: Biofilms are structured communities of microbial cells embedded in a self-produced matrix of extracellular polymeric substances. Biofilms are associated with many health issues in humans, including chronic wound infections and tooth decay. Current ... ...

    Abstract Biofilms are structured communities of microbial cells embedded in a self-produced matrix of extracellular polymeric substances. Biofilms are associated with many health issues in humans, including chronic wound infections and tooth decay. Current antimicrobials are often incapable of disrupting the polymeric biofilm matrix and reaching the bacteria within. Alternative approaches are needed. Here, we described a complex structure of a dextran-coated gold-in-gold cage nanoparticle that enabled photoacoustic and photothermal properties for biofilm detection and treatment. Activation of these nanoparticles with a near infrared laser could selectively detect and kill biofilm bacteria with precise spatial control and in a short timeframe. We observed a strong biocidal effect against both Streptococcus mutans and Staphylococcus aureus biofilms in mouse models of oral plaque and wound infections, respectively. These effects were over 100 times greater than those seen with chlorhexidine, a conventional antimicrobial agent. Moreover, this approach did not adversely affect surrounding tissues. We concluded that photothermal ablation using theranostic nanoparticles is a rapid, precise, and nontoxic method to detect and treat biofilm-associated infections.
    MeSH term(s) Animals ; Mice ; Anti-Bacterial Agents ; Biofilms ; Gold/pharmacology ; Gold/chemistry ; Nanoparticles/chemistry ; Photoacoustic Techniques ; Precision Medicine ; Wound Infection
    Chemical Substances Anti-Bacterial Agents ; Gold (7440-57-5)
    Language English
    Publishing date 2023-11-01
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, N.I.H., Extramural
    ZDB-ID 3067-3
    ISSN 1558-8238 ; 0021-9738
    ISSN (online) 1558-8238
    ISSN 0021-9738
    DOI 10.1172/JCI168485
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Phages in vaccine design and immunity; mechanisms and mysteries.

    de Vries, Christiaan R / Chen, Qingquan / Demirdjian, Sally / Kaber, Gernot / Khosravi, Arya / Liu, Dan / Van Belleghem, Jonas D / Bollyky, Paul L

    Current opinion in biotechnology

    2020  Volume 68, Page(s) 160–165

    Abstract: Bacteriophages have attracted extensive interest in vaccine design. This includes the use of phage display technology to select antigens, the use of engineered phages displaying target antigens in vaccine formulations, and phage DNA vaccines. However, ... ...

    Abstract Bacteriophages have attracted extensive interest in vaccine design. This includes the use of phage display technology to select antigens, the use of engineered phages displaying target antigens in vaccine formulations, and phage DNA vaccines. However, the development of these approaches is limited in part by uncertainty regarding the underlying mechanisms by which phages elicit immunity. This has stymied the clinical development of this technology. Here we review the immunology of phage vaccines and highlight the gaps in our knowledge regarding the underlying mechanisms. First, we review the basic biology of phages and their use in vaccines. Next we discuss what is known about the mechanisms of immunity against engineered phages and phage DNA. Finally, we highlight the gaps in our understanding regarding the immunogenicity of these preparations. We argue that mechanistic insight into the immunology of phage vaccines is essential for the further development and clinical utility of these technologies.
    MeSH term(s) Bacteriophages/genetics ; Cell Surface Display Techniques ; Vaccines
    Chemical Substances Vaccines
    Language English
    Publishing date 2020-12-11
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 1052045-4
    ISSN 1879-0429 ; 0958-1669
    ISSN (online) 1879-0429
    ISSN 0958-1669
    DOI 10.1016/j.copbio.2020.11.002
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Theranostic gold-in-gold cage nanoparticles enable photothermal ablation and photoacoustic imaging in biofilm-associated infection models

    Maryam Hajfathalian / Christiaan R. de Vries / Jessica C. Hsu / Ahmad Amirshaghaghi / Yuxi C. Dong / Zhi Ren / Yuan Liu / Yue Huang / Yong Li / Simon A.B. Knight / Pallavi Jonnalagadda / Aimen Zlitni / Elizabeth A. Grice / Paul L. Bollyky / Hyun Koo / David P. Cormode

    The Journal of Clinical Investigation, Vol 133, Iss

    2023  Volume 21

    Abstract: Biofilms are structured communities of microbial cells embedded in a self-produced matrix of extracellular polymeric substances. Biofilms are associated with many health issues in humans, including chronic wound infections and tooth decay. Current ... ...

    Abstract Biofilms are structured communities of microbial cells embedded in a self-produced matrix of extracellular polymeric substances. Biofilms are associated with many health issues in humans, including chronic wound infections and tooth decay. Current antimicrobials are often incapable of disrupting the polymeric biofilm matrix and reaching the bacteria within. Alternative approaches are needed. Here, we described a complex structure of a dextran-coated gold-in-gold cage nanoparticle that enabled photoacoustic and photothermal properties for biofilm detection and treatment. Activation of these nanoparticles with a near infrared laser could selectively detect and kill biofilm bacteria with precise spatial control and in a short timeframe. We observed a strong biocidal effect against both Streptococcus mutans and Staphylococcus aureus biofilms in mouse models of oral plaque and wound infections, respectively. These effects were over 100 times greater than those seen with chlorhexidine, a conventional antimicrobial agent. Moreover, this approach did not adversely affect surrounding tissues. We concluded that photothermal ablation using theranostic nanoparticles is a rapid, precise, and nontoxic method to detect and treat biofilm-associated infections.
    Keywords Infectious disease ; Therapeutics ; Medicine ; R
    Subject code 616
    Language English
    Publishing date 2023-11-01T00:00:00Z
    Publisher American Society for Clinical Investigation
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  5. Article ; Online: A Delayed Inoculation Model of Chronic Pseudomonas aeruginosa Wound Infection.

    de Vries, Christiaan R / Sweere, Johanna M / Ishak, Heather / Sunkari, Vivekananda / Bach, Michelle S / Liu, Dan / Manasherob, Robert / Bollyky, Paul L

    Journal of visualized experiments : JoVE

    2020  , Issue 156

    Abstract: Pseudomonas aeruginosa (P. aeruginosa) is a major nosocomial pathogen of increasing relevance to human health and disease, particularly in the setting of chronic wound infections in diabetic and hospitalized patients. There is an urgent need for chronic ... ...

    Abstract Pseudomonas aeruginosa (P. aeruginosa) is a major nosocomial pathogen of increasing relevance to human health and disease, particularly in the setting of chronic wound infections in diabetic and hospitalized patients. There is an urgent need for chronic infection models to aid in the investigation of wound pathogenesis and the development of new therapies against this pathogen. Here, we describe a protocol that uses delayed inoculation 24 hours after full-thickness excisional wounding. The infection of the provisional wound matrix present at this time forestalls either rapid clearance or dissemination of infection and instead establishes chronic infection lasting 7-10 days without the need for implantation of foreign materials or immune suppression. This protocol mimics a typical temporal course of post-operative infection in humans. The use of a luminescent P. aeruginosa strain (PAO1:lux) allows for quantitative daily assessment of bacterial burden for P. aeruginosa wound infections. This novel model may be a useful tool in the investigation of bacterial pathogenesis and the development of new therapies for chronic P. aeruginosa wound infections.
    MeSH term(s) Animals ; Disease Models, Animal ; Mice ; Mice, Inbred C57BL ; Pseudomonas Infections/microbiology ; Pseudomonas Infections/pathology ; Pseudomonas aeruginosa/pathogenicity ; Wound Infection/microbiology ; Wound Infection/pathology
    Language English
    Publishing date 2020-02-20
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Video-Audio Media
    ZDB-ID 2259946-0
    ISSN 1940-087X ; 1940-087X
    ISSN (online) 1940-087X
    ISSN 1940-087X
    DOI 10.3791/60599
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: The Safety and Toxicity of Phage Therapy: A Review of Animal and Clinical Studies.

    Liu, Dan / Van Belleghem, Jonas D / de Vries, Christiaan R / Burgener, Elizabeth / Chen, Qingquan / Manasherob, Robert / Aronson, Jenny R / Amanatullah, Derek F / Tamma, Pranita D / Suh, Gina A

    Viruses

    2021  Volume 13, Issue 7

    Abstract: Increasing rates of infection by antibiotic resistant bacteria have led to a resurgence of interest in bacteriophage (phage) therapy. Several phage therapy studies in animals and humans have been completed over the last two decades. We conducted a ... ...

    Abstract Increasing rates of infection by antibiotic resistant bacteria have led to a resurgence of interest in bacteriophage (phage) therapy. Several phage therapy studies in animals and humans have been completed over the last two decades. We conducted a systematic review of safety and toxicity data associated with phage therapy in both animals and humans reported in English language publications from 2008-2021. Overall, 69 publications met our eligibility criteria including 20 animal studies, 35 clinical case reports or case series, and 14 clinical trials. After summarizing safety and toxicity data from these publications, we discuss potential approaches to optimize safety and toxicity monitoring with the therapeutic use of phage moving forward. In our systematic review of the literature, we found some adverse events associated with phage therapy, but serious events were extremely rare. Comprehensive and standardized reporting of potential toxicities associated with phage therapy has generally been lacking in the published literature. Structured safety and tolerability endpoints are necessary when phages are administered as anti-infective therapeutics.
    MeSH term(s) Animals ; Bacterial Infections/therapy ; Bacteriophages/pathogenicity ; Clinical Trials as Topic ; Disease Models, Animal ; Humans ; Mice ; Phage Therapy/adverse effects ; Phage Therapy/methods
    Language English
    Publishing date 2021-06-29
    Publishing country Switzerland
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2516098-9
    ISSN 1999-4915 ; 1999-4915
    ISSN (online) 1999-4915
    ISSN 1999-4915
    DOI 10.3390/v13071268
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Microbial Cell-Free DNA Identifies the Causative Pathogen in Infective Endocarditis and Remains Detectable Longer Than Conventional Blood Culture in Patients with Prior Antibiotic Therapy.

    Eichenberger, Emily M / Degner, Nicholas / Scott, Erick R / Ruffin, Felicia / Franzone, John / Sharma-Kuinkel, Batu / Shah, Pratik / Hong, David / Dalai, Sudeb C / Blair, Lily / Hollemon, Desiree / Chang, Eliza / Ho, Carine / Wanda, Lisa / de Vries, Christiaan R / Fowler, Vance G / Ahmed, Asim A

    Clinical infectious diseases : an official publication of the Infectious Diseases Society of America

    2022  Volume 76, Issue 3, Page(s) e1492–e1500

    Abstract: Background: The diagnosis of infective endocarditis (IE) can be difficult, particularly if blood cultures fail to yield a pathogen. This study evaluates the potential utility of microbial cell-free DNA (mcfDNA) as a tool to identify the microbial ... ...

    Abstract Background: The diagnosis of infective endocarditis (IE) can be difficult, particularly if blood cultures fail to yield a pathogen. This study evaluates the potential utility of microbial cell-free DNA (mcfDNA) as a tool to identify the microbial etiology of IE.
    Methods: Blood samples from patients with suspected IE were serially collected. mcfDNA was extracted from plasma and underwent next-generation sequencing. Reads were aligned against a library containing DNA sequences belonging to >1400 different pathogens. mcfDNA from organisms present above a statistical threshold were reported and quantified in molecules per milliliter (MPM). Additional mcfDNA was collected on each subject every 2-3 days for a total of 7 collections or until discharge.
    Results: Of 30 enrolled patients with suspected IE, 23 had definite IE, 2 had possible IE, and IE was rejected in 5 patients by modified Duke Criteria. Only the 23 patients with definite IE were included for analysis. Both mcfDNA and blood cultures achieved a sensitivity of 87%. The median duration of positivity from antibiotic treatment initiation was estimated to be approximately 38.1 days for mcfDNA versus 3.7 days for blood culture (proportional odds, 2.952; P = .02771), using a semiparametric survival analysis. mcfDNA (log10) levels significantly declined (-0.3 MPM log10 units, 95% credible interval -0.45 to -0.14) after surgical source control was performed (pre- vs postprocedure, posterior probability >0.99).
    Conclusion: mcfDNA accurately identifies the microbial etiology of IE. Sequential mcfDNA levels may ultimately help to individualize therapy by estimating a patient's burden of infection and response to treatment.
    MeSH term(s) Humans ; Blood Culture ; Anti-Bacterial Agents/therapeutic use ; Cell-Free Nucleic Acids ; Endocarditis, Bacterial/diagnosis ; Endocarditis/diagnosis ; Endocarditis/drug therapy
    Chemical Substances Anti-Bacterial Agents ; Cell-Free Nucleic Acids
    Language English
    Publishing date 2022-06-09
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 1099781-7
    ISSN 1537-6591 ; 1058-4838
    ISSN (online) 1537-6591
    ISSN 1058-4838
    DOI 10.1093/cid/ciac426
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article: A delayed inoculation model of chronic Pseudomonas aeruginosa wound infection

    de Vries, Christiaan R / Sweere, Johanna M / Ishak, Heather / Sunkari, Vivekananda / Bach, Michelle S / Liu, Dan / Manasherob, Robert / Bollyky, Paul L

    Journal of visualized experiments. 2020 Feb. 20, , no. 156

    2020  

    Abstract: Pseudomonas aeruginosa (P. aeruginosa) is a major nosocomial pathogen of increasing relevance to human health and disease, particularly in the setting of chronic wound infections in diabetic and hospitalized patients. There is an urgent need for chronic ... ...

    Abstract Pseudomonas aeruginosa (P. aeruginosa) is a major nosocomial pathogen of increasing relevance to human health and disease, particularly in the setting of chronic wound infections in diabetic and hospitalized patients. There is an urgent need for chronic infection models to aid in the investigation of wound pathogenesis and the development of new therapies against this pathogen. Here, we describe a protocol that uses delayed inoculation 24 hours after full-thickness excisional wounding. The infection of the provisional wound matrix present at this time forestalls either rapid clearance or dissemination of infection and instead establishes chronic infection lasting 7–10 days without the need for implantation of foreign materials or immune suppression. This protocol mimics a typical temporal course of post-operative infection in humans. The use of a luminescent P. aeruginosa strain (PAO1:lux) allows for quantitative daily assessment of bacterial burden for P. aeruginosa wound infections. This novel model may be a useful tool in the investigation of bacterial pathogenesis and the development of new therapies for chronic P. aeruginosa wound infections.
    Keywords Pseudomonas aeruginosa ; cross infection ; human diseases ; human health ; luminescence ; microbial load ; models ; pathogenesis ; pathogens ; patients
    Language English
    Dates of publication 2020-0220
    Size p. e60599.
    Publishing place Journal of Visualized Experiments
    Document type Article
    ZDB-ID 2259946-0
    ISSN 1940-087X
    ISSN 1940-087X
    DOI 10.3791/60599
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  9. Article ; Online: Hormonal control during infancy and testicular adrenal rest tumor development in males with congenital adrenal hyperplasia: a retrospective multicenter cohort study.

    Schröder, Mariska A M / Neacşu, Mihaela / Adriaansen, Bas P H / Sweep, Fred C G J / Ahmed, S Faisal / Ali, Salma R / Bachega, Tânia A S S / Baronio, Federico / Birkebæk, Niels Holtum / de Bruin, Christiaan / Bonfig, Walter / Bryce, Jillian / Clemente, Maria / Cools, Martine / Elsedfy, Heba / Globa, Evgenia / Guran, Tulay / Güven, Ayla / Amr, Nermine Hussein /
    Janus, Dominika / Taube, Nina Lenherr / Markosyan, Renata / Miranda, Mirela / Poyrazoğlu, Şükran / Rees, Aled / Salerno, Mariacarolina / Stancampiano, Marianna Rita / Vieites, Ana / de Vries, Liat / Yavas Abali, Zehra / Span, Paul N / Claahsen-van der Grinten, Hedi L

    European journal of endocrinology

    2023  Volume 189, Issue 4, Page(s) 460–468

    Abstract: Importance: Testicular adrenal rest tumors (TARTs), often found in male patients with congenital adrenal hyperplasia (CAH), are benign lesions causing testicular damage and infertility. We hypothesize that chronically elevated adrenocorticotropic ... ...

    Abstract Importance: Testicular adrenal rest tumors (TARTs), often found in male patients with congenital adrenal hyperplasia (CAH), are benign lesions causing testicular damage and infertility. We hypothesize that chronically elevated adrenocorticotropic hormone exposure during early life may promote TART development.
    Objective: This study aimed to examine the association between commencing adequate glucocorticoid treatment early after birth and TART development.
    Design and participants: This retrospective multicenter (n = 22) open cohort study collected longitudinal clinical and biochemical data of the first 4 years of life using the I-CAH registry and included 188 male patients (median age 13 years; interquartile range: 10-17) with 21-hydroxylase deficiency (n = 181) or 11-hydroxylase deficiency (n = 7). All patients underwent at least 1 testicular ultrasound.
    Results: TART was detected in 72 (38%) of the patients. Prevalence varied between centers. When adjusted for CAH phenotype, a delayed CAH diagnosis of >1 year, compared with a diagnosis within 1 month of life, was associated with a 2.6 times higher risk of TART diagnosis. TART onset was not predicted by biochemical disease control or bone age advancement in the first 4 years of life, but increased height standard deviation scores at the end of the 4-year study period were associated with a 27% higher risk of TART diagnosis.
    Conclusions and relevance: A delayed CAH diagnosis of >1 year vs CAH diagnosis within 1 month after birth was associated with a higher risk of TART development, which may be attributed to poor disease control in early life.
    MeSH term(s) Adolescent ; Humans ; Male ; Adrenal Hyperplasia, Congenital/genetics ; Adrenal Rest Tumor/epidemiology ; Adrenal Rest Tumor/etiology ; Cohort Studies ; Testicular Neoplasms/epidemiology ; Testicular Neoplasms/complications ; Child
    Language English
    Publishing date 2023-10-30
    Publishing country England
    Document type Multicenter Study ; Journal Article
    ZDB-ID 1183856-5
    ISSN 1479-683X ; 0804-4643
    ISSN (online) 1479-683X
    ISSN 0804-4643
    DOI 10.1093/ejendo/lvad143
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Pf Bacteriophage and Their Impact on Pseudomonas Virulence, Mammalian Immunity, and Chronic Infections.

    Secor, Patrick R / Burgener, Elizabeth B / Kinnersley, M / Jennings, Laura K / Roman-Cruz, Valery / Popescu, Medeea / Van Belleghem, Jonas D / Haddock, Naomi / Copeland, Conner / Michaels, Lia A / de Vries, Christiaan R / Chen, Qingquan / Pourtois, Julie / Wheeler, Travis J / Milla, Carlos E / Bollyky, Paul L

    Frontiers in immunology

    2020  Volume 11, Page(s) 244

    Abstract: Pf bacteriophage are temperate phages that infect the ... ...

    Abstract Pf bacteriophage are temperate phages that infect the bacterium
    MeSH term(s) Animals ; Bacteriophages/physiology ; Biofilms ; Chronic Disease ; Drug Resistance, Microbial ; Humans ; Mammals ; Pseudomonas Infections/immunology ; Pseudomonas Infections/transmission ; Pseudomonas Infections/virology ; Pseudomonas aeruginosa/physiology ; Virulence
    Language English
    Publishing date 2020-02-21
    Publishing country Switzerland
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2606827-8
    ISSN 1664-3224 ; 1664-3224
    ISSN (online) 1664-3224
    ISSN 1664-3224
    DOI 10.3389/fimmu.2020.00244
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top