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Bowden LC, Evans JGW, Miller KM, Bowden AE, Jensen BD, Hope S, Berges BK. Carbon-infiltrated carbon nanotubes inhibit the development of Staphylococcus aureus biofilms. Sci Rep 2023; 13:19398. [PMID: 37938619 PMCID: PMC10632507 DOI: 10.1038/s41598-023-46748-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2023] [Accepted: 11/04/2023] [Indexed: 11/09/2023] Open
Abstract
Staphylococcus aureus forms biofilms that cause considerable morbidity and mortality in patients who receive implanted devices such as prosthetics or fixator pins. An ideal surface for such medical devices would inhibit biofilm growth. Recently, it was reported that surface modification of stainless steel materials with carbon-infiltrated carbon nanotubes (CICNT) inhibits the growth of S. aureus biofilms. The purpose of this study was to investigate this antimicrobial effect on titanium materials with CICNT coated surfaces in a variety of surface morphologies and across a broader spectrum of S. aureus isolates. Study samples of CICNT-coated titanium, and control samples of bare titanium, a common implant material, were exposed to S. aureus. Viable bacteria were removed from adhered biofilms and quantified as colony forming units. Scanning electron microscopy was used to qualitatively analyze biofilms both before and after removal of cells. The CICNT surface was found to have significantly fewer adherent bacteria than bare titanium control surfaces, both via colony forming unit and microscopic analyses. This effect was most pronounced on CICNT surfaces with an average nanotube diameter of 150 nm, showing a 2.5-fold reduction in adherent bacteria. Since S. aureus forms different biofilm structures by isolate and by growth conditions, we tested 7 total isolates and found a significant reduction in the biofilm load in six out of seven S. aureus isolates tested. To examine whether the anti-biofilm effect was due to the structure of the nanotubes, we generated an unstructured carbon surface. Significantly more bacteria adhered to a nonstructured carbon surface than to the 150 nm CICNT surface, suggesting that the topography of the nanotube structure itself has anti-biofilm properties. The CICNT surface possesses anti-biofilm properties that result in fewer adherent S. aureus bacteria. These anti-biofilm properties are consistent across multiple isolates of S. aureus and are affected by nanotube diameter. The experiments performed in this study suggest that this effect is due to the nanostructure of the CICNT surface.
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Affiliation(s)
- Lucy C Bowden
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, 84602, USA
| | - Jocelyn G W Evans
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, 84602, USA
| | - Katelyn M Miller
- Department of Statistics, Brigham Young University, Provo, UT, 84602, USA
| | - Anton E Bowden
- Department of Mechanical Engineering, Brigham Young University, Provo, UT, 84602, USA
| | - Brian D Jensen
- Department of Mechanical Engineering, Brigham Young University, Provo, UT, 84602, USA
| | - Sandra Hope
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, 84602, USA
| | - Bradford K Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, 84602, USA.
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2
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Scott TM, Solis-Leal A, Lopez JB, Robison RA, Berges BK, Pickett BE. Comparison of Intracellular Transcriptional Response of NHBE Cells to Infection with SARS-CoV-2 Washington and New York Strains. Front Cell Infect Microbiol 2022; 12:1009328. [PMID: 36204651 PMCID: PMC9530606 DOI: 10.3389/fcimb.2022.1009328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Accepted: 08/26/2022] [Indexed: 11/13/2022] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first reported in Wuhan, China in December 2019 and caused a global pandemic resulting in millions of deaths and tens of millions of patients positive tests. While studies have shown a D614G mutation in the viral spike protein are more transmissible, the effects of this and other mutations on the host response, especially at the cellular level, are yet to be fully elucidated. In this experiment we infected normal human bronchial epithelial (NHBE) cells with the Washington (D614) strain or the New York (G614) strains of SARS-CoV-2. We generated RNA sequencing data at 6, 12, and 24 hours post-infection (hpi) to improve our understanding of how the intracellular host response differs between infections with these two strains. We analyzed these data with a bioinformatics pipeline that identifies differentially expressed genes (DEGs), enriched Gene Ontology (GO) terms and dysregulated signaling pathways. We detected over 2,000 DEGs, over 600 GO terms, and 29 affected pathways between the two infections. Many of these entities play a role in immune signaling and response. A comparison between strains and time points showed a higher similarity between matched time points than across different time points with the same strain in DEGs and affected pathways, but found more similarity between strains across different time points when looking at GO terms. A comparison of the affected pathways showed that the 24hpi samples of the New York strain were more similar to the 12hpi samples of the Washington strain, with a large number of pathways related to translation being inhibited in both strains. These results suggest that the various mutations contained in the genome of these two viral isolates may cause distinct effects on the host transcriptional response in infected host cells, especially relating to how quickly translation is dysregulated after infection. This comparison of the intracellular host response to infection with these two SARS-CoV-2 isolates suggest that some of the mechanisms associated with more severe disease from these viruses could include virus replication, metal ion usage, host translation shutoff, host transcript stability, and immune inhibition.
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Affiliation(s)
- Tiana M. Scott
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States
| | - Antonio Solis-Leal
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States
- Population Health and Host-pathogen Interactions Programs, Texas Biomedical Research Institute, San Antonio, TX, United States
| | - J. Brandon Lopez
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States
| | - Richard A. Robison
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States
| | - Bradford K. Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States
| | - Brett E. Pickett
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States
- *Correspondence: Brett E. Pickett,
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3
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Gray M, Guerrero-Arguero I, Solis-Leal A, Robison RA, Berges BK, Pickett BE. Chikungunya virus time course infection of human macrophages reveals intracellular signaling pathways relevant to repurposed therapeutics. PeerJ 2022; 10:e13090. [PMID: 35341048 PMCID: PMC8944338 DOI: 10.7717/peerj.13090] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 02/18/2022] [Indexed: 01/12/2023] Open
Abstract
Background Chikungunya virus (CHIKV) is a mosquito-borne pathogen, within the Alphavirus genus of the Togaviridae family, that causes ~1.1 million human infections annually. CHIKV uses Aedes albopictus and Aedes aegypti mosquitoes as insect vectors. Human infections can develop arthralgia and myalgia, which results in debilitating pain for weeks, months, and even years after acute infection. No therapeutic treatments or vaccines currently exist for many alphaviruses, including CHIKV. Targeting the phagocytosis of CHIKV by macrophages after mosquito transmission plays an important role in early productive viral infection in humans, and could reduce viral replication and/or symptoms. Methods To better characterize the transcriptional response of macrophages during early infection, we generated RNA-sequencing data from a CHIKV-infected human macrophage cell line at eight or 24 hours post-infection (hpi), together with mock-infected controls. We then calculated differential gene expression, enriched functional annotations, modulated intracellular signaling pathways, and predicted therapeutic drugs from these sequencing data. Results We observed 234 pathways were significantly affected 24 hpi, resulting in six potential pharmaceutical treatments to modulate the affected pathways. A subset of significant pathways at 24 hpi includes AGE-RAGE, Fc epsilon RI, Chronic myeloid leukemia, Fc gamma R-mediated phagocytosis, and Ras signaling. We found that the MAPK1 and MAPK3 proteins are shared among this subset of pathways and that Telmisartan and Dasatinib are strong candidates for repurposed small molecule therapeutics that target human processes. The results of our analysis can be further characterized in the wet lab to contribute to the development of host-based prophylactics and therapeutics.
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Affiliation(s)
- Madison Gray
- Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, United States of America
| | - Israel Guerrero-Arguero
- Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, United States of America,Population Health and Host-pathogen Interactions Programs, Texas Biomedical Research Institute, San Antonio, Texas, United States of America
| | - Antonio Solis-Leal
- Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, United States of America,Population Health and Host-pathogen Interactions Programs, Texas Biomedical Research Institute, San Antonio, Texas, United States of America
| | - Richard A. Robison
- Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, United States of America
| | - Bradford K. Berges
- Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, United States of America
| | - Brett E. Pickett
- Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, United States of America
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4
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Guerrero-Arguero I, Tellez-Freitas CM, Weber KS, Berges BK, Robison RA, Pickett BE. Alphaviruses: Host pathogenesis, immune response, and vaccine & treatment updates. J Gen Virol 2021; 102. [PMID: 34435944 DOI: 10.1099/jgv.0.001644] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Human pathogens belonging to the Alphavirus genus, in the Togaviridae family, are transmitted primarily by mosquitoes. The signs and symptoms associated with these viruses include fever and polyarthralgia, defined as joint pain and inflammation, as well as encephalitis. In the last decade, our understanding of the interactions between members of the alphavirus genus and the human host has increased due to the re-appearance of the chikungunya virus (CHIKV) in Asia and Europe, as well as its emergence in the Americas. Alphaviruses affect host immunity through cytokines and the interferon response. Understanding alphavirus interactions with both the innate immune system as well as the various cells in the adaptive immune systems is critical to developing effective therapeutics. In this review, we summarize the latest research on alphavirus-host cell interactions, underlying infection mechanisms, and possible treatments.
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Affiliation(s)
- Israel Guerrero-Arguero
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA.,Texas Biomedical Research Institute, San Antonio, TX, USA
| | | | - K Scott Weber
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
| | - Bradford K Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
| | - Richard A Robison
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
| | - Brett E Pickett
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
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5
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Nandakumar V, Profaizer T, Lozier BK, Elgort MG, Larragoite ET, Williams ESCP, Solis-Leal A, Lopez JB, Berges BK, Planelles V, Rychert J, Slev PR, Delgado JC. Evaluation of a Surrogate ELISA- Based Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) cPass Neutralization Antibody Detection Assay and Correlation with IgG Commercial Serology Assays. Arch Pathol Lab Med 2021; 145:1212-1220. [PMID: 34181714 DOI: 10.5858/arpa.2021-0213-sa] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2021] [Indexed: 11/06/2022]
Abstract
CONTEXT Emerging evidence shows correlation between the presence of neutralization antibodies (nAbs) and protective immunity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Currently available commercial serology assays lack the ability to specifically identify nAbs. An ELISAbased nAb assay (GenScript cPass neutralization antibody assay) has recently received emergency use authorization from the Food and Drug Administration (FDA). OBJECTIVE To evaluate the performance characteristics of this assay and compare and correlate it with the commercial assays that detect SARS-CoV-2 specific IgG. DESIGN Specimens from SARS-COV-2 infected patients (n=124), healthy donors obtained pre-pandemic (n=100), and from patients with non-COVID (coronavirus disease 2019) respiratory infections (n=92) were analyzed using this assay. Samples with residual volume were also tested on three commercial serology platforms (Abbott, EUROIMMUN, Siemens). Twenty-eight randomly selected specimens from patients with COVID-19 and 10 healthy controls were subjected to a Plaque Reduction Neutralization Test (PRNT). RESULTS The cPass assay exhibited 96.1% (95% CI, 94.9%-97.3%) sensitivity (at >14 days post- positive PCR), 100% (95% CI, 98.0%-100.0%) specificity and zero cross-reactivity for the presence of non- COVID respiratory infections. When compared to the plaque reduction assay, 97.4% (95% CI, 96.2%-98.5%) qualitative agreement and a positive correlation (R2 =0.76) was observed. Comparison of IgG signals from each of the commercial assays with the nAb results from PRNT/cPass assays displayed >94.7% qualitative agreement and correlations with R2=0.43/0.68 (Abbott), R2=0.57/0.85 (EUROIMMUN) and R2=0.39/0.63 (Siemens), respectively. CONCLUSIONS The combined data support the use of cPass assay for accurate detection of the nAb response. Positive IgG results from commercial assays associated reasonably with nAbs presence and can serve as a substitute.
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Affiliation(s)
- Vijayalakshmi Nandakumar
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, Utah, USA (Nandakumar, Profaizer, Lozier, Elgort, Rychert, Slev, Delgado).,Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, USA (Nandakumar, Larragoite, Williams, Planelles, Rychert, Slev, Delgado)
| | - Tracie Profaizer
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, Utah, USA (Nandakumar, Profaizer, Lozier, Elgort, Rychert, Slev, Delgado)
| | - Bucky K Lozier
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, Utah, USA (Nandakumar, Profaizer, Lozier, Elgort, Rychert, Slev, Delgado)
| | - Marc G Elgort
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, Utah, USA (Nandakumar, Profaizer, Lozier, Elgort, Rychert, Slev, Delgado)
| | - Erin T Larragoite
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, USA (Nandakumar, Larragoite, Williams, Planelles, Rychert, Slev, Delgado)
| | - Elizabeth S C P Williams
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, USA (Nandakumar, Larragoite, Williams, Planelles, Rychert, Slev, Delgado)
| | - Antonio Solis-Leal
- Department of Microbiology & Molecular Biology, Brigham Young University, Provo, UTAH, USA (Solis-Leal, Lopez, Berges)
| | - J Brandon Lopez
- Department of Microbiology & Molecular Biology, Brigham Young University, Provo, UTAH, USA (Solis-Leal, Lopez, Berges)
| | - Bradford K Berges
- Department of Microbiology & Molecular Biology, Brigham Young University, Provo, UTAH, USA (Solis-Leal, Lopez, Berges)
| | - Vicente Planelles
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, USA (Nandakumar, Larragoite, Williams, Planelles, Rychert, Slev, Delgado)
| | - Jenna Rychert
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, Utah, USA (Nandakumar, Profaizer, Lozier, Elgort, Rychert, Slev, Delgado).,Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, USA (Nandakumar, Larragoite, Williams, Planelles, Rychert, Slev, Delgado)
| | - Patricia R Slev
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, Utah, USA (Nandakumar, Profaizer, Lozier, Elgort, Rychert, Slev, Delgado).,Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, USA (Nandakumar, Larragoite, Williams, Planelles, Rychert, Slev, Delgado)
| | - Julio C Delgado
- ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, Utah, USA (Nandakumar, Profaizer, Lozier, Elgort, Rychert, Slev, Delgado).,Department of Pathology, University of Utah School of Medicine, Salt Lake City, Utah, USA (Nandakumar, Larragoite, Williams, Planelles, Rychert, Slev, Delgado)
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6
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He W, Huang X, Berges BK, Wang Y, An N, Su R, Lu Y. Artesunate Regulates Neurite Outgrowth Inhibitor Protein B Receptor to Overcome Resistance to Sorafenib in Hepatocellular Carcinoma Cells. Front Pharmacol 2021; 12:615889. [PMID: 33716742 PMCID: PMC7946852 DOI: 10.3389/fphar.2021.615889] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2020] [Accepted: 01/19/2021] [Indexed: 12/24/2022] Open
Abstract
The multireceptor tyrosine kinase inhibitor sorafenib is a Food and Drug Administration-approved first-line drug for the treatment of advanced liver cancer that can reportedly extend overall survival in patients with advanced hepatocellular carcinoma (HCC). Primary and acquired resistance to sorafenib are gradually increasing however, leading to failure of HCC treatment with sorafenib. It is therefore crucial to study the potential mechanism of sorafenib resistance. The results of the current study indicate that neurite outgrowth inhibitor protein B receptor (NgBR) is overexpressed in cultured sorafenib-resistant cells, and that its expression is negatively correlated with the sensitivity of liver cancer cells to sorafenib. Artesunate can inhibit the expression of NgBR, and it may block sorafenib resistance. Herein we report that sorafenib treatment in combination with artesunate overcomes HCC resistance to sorafenib alone in a cell culture model.
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Affiliation(s)
- Wubin He
- Key laboratory of surgery of Liaoning Province of The First Affiliated Hospital of Jinzhou Medical University, Liaoning, China
| | - Xiaoxu Huang
- Key Laboratory of Molecular Cell Biology and New Drug Development of Jinzhou Medical University, Liaoning, Jinzhou, China
| | - Bradford K Berges
- Department of Microbiology and Molecular Biology of Brigham Young University, Provo, UT, United States
| | - Yue Wang
- Department of Pathlogy of The First Affiliated Hospital of Jinzhou Medical University, Liaoning, China
| | - Ni An
- Key Laboratory of Molecular Cell Biology and New Drug Development of Jinzhou Medical University, Liaoning, Jinzhou, China
| | - Rongjian Su
- Key Laboratory of Molecular Cell Biology and New Drug Development of Jinzhou Medical University, Liaoning, Jinzhou, China
| | - Yanyan Lu
- Department of Orthopedic Spine Surgery of The First Affiliated Hospital of Jinzhou Medical University, Liaoning, China
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7
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Ogilvie BH, Solis-Leal A, Lopez JB, Poole BD, Robison RA, Berges BK. Alcohol-free hand sanitizer and other quaternary ammonium disinfectants quickly and effectively inactivate SARS-CoV-2. J Hosp Infect 2020; 108:142-145. [PMID: 33259880 PMCID: PMC7700010 DOI: 10.1016/j.jhin.2020.11.023] [Citation(s) in RCA: 51] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 11/23/2020] [Accepted: 11/25/2020] [Indexed: 11/18/2022]
Abstract
BACKGROUND SARS-CoV-2 is the virus responsible for the current global pandemic, COVID-19. Because this virus is novel, little is known about its sensitivity to disinfection. METHODS We performed suspension tests against SARS-CoV-2 using three commercially available quaternary ammonium compound (Quat) disinfectants and one laboratory-made 0.2% benzalkonium chloride solution. FINDINGS Three of the four formulations completely inactivated the virus within 15 s of contact, even in the presence of a soil load or when diluted in hard water. CONCLUSION Quats rapidly inactivate SARS-CoV-2, making them potentially useful for controlling SARS-CoV-2 spread in hospitals and the community.
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Affiliation(s)
- B H Ogilvie
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
| | - A Solis-Leal
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
| | - J B Lopez
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
| | - B D Poole
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
| | - R A Robison
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
| | - B K Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA.
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8
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Pogue K, Jensen JL, Stancil CK, Ferguson DG, Hughes SJ, Mello EJ, Burgess R, Berges BK, Quaye A, Poole BD. Influences on Attitudes Regarding Potential COVID-19 Vaccination in the United States. Vaccines (Basel) 2020; 8:E582. [PMID: 33022917 PMCID: PMC7711655 DOI: 10.3390/vaccines8040582] [Citation(s) in RCA: 280] [Impact Index Per Article: 70.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Revised: 09/28/2020] [Accepted: 09/28/2020] [Indexed: 01/01/2023] Open
Abstract
The COVID-19 pandemic continues to ravage the world, with the United States being highly affected. A vaccine provides the best hope for a permanent solution to controlling the pandemic. However, to be effective, a vaccine must be accepted and used by a large majority of the population. The aim of this study was to understand the attitudes towards and obstacles facing vaccination with a potential COVID-19 vaccine. To measure these attitudes a survey was administered to 316 respondents across the United States by a survey corporation. Structural equation modeling was used to analyze the relationships of several factors with attitudes toward potential COVID-19 vaccination. Prior vaccine usage and attitudes predicted attitudes towards COVID-19 vaccination. Assessment of the severity of COVID-19 for the United States was also predictive. Approximately 68% of all respondents were supportive of being vaccinated for COVID-19, but side effects, efficacy and length of testing remained concerns. Longer testing, increased efficacy and development in the United States were significantly associated with increased vaccine acceptance. Messages promoting COVID-19 vaccination should seek to alleviate the concerns of those who are already vaccine-hesitant. Messaging directed at the benefits of vaccination for the United States as a country would address the second predictive factor. Enough time should be taken to allay concerns about both short- and long-term side effects before a vaccine is released.
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Affiliation(s)
- Kendall Pogue
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA; (K.P.); (C.K.S.); (S.J.H.); (E.J.M.); (R.B.); (B.K.B.); (A.Q.)
| | - Jamie L. Jensen
- Department of Biology, Brigham Young University, Provo, UT 84602, USA; (J.L.J.); (D.G.F.)
| | - Carter K. Stancil
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA; (K.P.); (C.K.S.); (S.J.H.); (E.J.M.); (R.B.); (B.K.B.); (A.Q.)
| | - Daniel G. Ferguson
- Department of Biology, Brigham Young University, Provo, UT 84602, USA; (J.L.J.); (D.G.F.)
| | - Savannah J. Hughes
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA; (K.P.); (C.K.S.); (S.J.H.); (E.J.M.); (R.B.); (B.K.B.); (A.Q.)
| | - Emily J. Mello
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA; (K.P.); (C.K.S.); (S.J.H.); (E.J.M.); (R.B.); (B.K.B.); (A.Q.)
| | - Ryan Burgess
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA; (K.P.); (C.K.S.); (S.J.H.); (E.J.M.); (R.B.); (B.K.B.); (A.Q.)
| | - Bradford K. Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA; (K.P.); (C.K.S.); (S.J.H.); (E.J.M.); (R.B.); (B.K.B.); (A.Q.)
| | - Abraham Quaye
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA; (K.P.); (C.K.S.); (S.J.H.); (E.J.M.); (R.B.); (B.K.B.); (A.Q.)
| | - Brian D. Poole
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA; (K.P.); (C.K.S.); (S.J.H.); (E.J.M.); (R.B.); (B.K.B.); (A.Q.)
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9
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Velazquez EJ, Brindley TD, Shrestha G, Bitter EE, Cress JD, Townsend MH, Berges BK, Robison RA, Weber KS, O’Neill KL. Novel monoclonal antibodies against thymidine kinase 1 and their potential use for the immunotargeting of lung, breast and colon cancer cells. Cancer Cell Int 2020; 20:127. [PMID: 32317865 PMCID: PMC7160906 DOI: 10.1186/s12935-020-01198-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 03/31/2020] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Thymidine kinase 1 (TK1) is a pyrimidine salvage pathway enzyme that is up-regulated in malignant tissues and elevated in the serum of cancer patients. While TK1 has been well established as a tumor biomarker, little has been done to explore its potential as a tumor target. Recently, we reported the membrane expression of TK1 on malignant cells, but not on normal cells. This study explores the possible use of monoclonal antibodies for the targeting of membrane associated TK1 in lung, breast, colon and prostate cancer cells. METHODS We generated and evaluated a panel of monoclonal antibodies against six different epitopes exposed in the tetrameric form of TK1. Antibodies were developed with hybridoma technology and validated with Western blot, siRNA TK1 knockdown, enzyme-linked immunosorbent assay (ELISA) and flow cytometry. The therapeutic potential of the antibodies was evaluated in vitro in antibody-dependent cell-mediated-cytotoxicity (ADCC) experiments. RESULTS Binding of the antibodies to TK1 was confirmed by Western blot in purified recombinant protein, cancer serum, and cell lysate. After a TK1 knockdown was performed, a reduction of TK1 expression was observed with five antibodies. Using indirect ELISA, we identified 3B2E11, 9C10, 7H2, 3B4, 8G2 among the most sensitive antibodies (LOD = 10.73-66.9 pg/ml). Surface expression of TK1 on the membrane of various cancer cell lines was analyzed with flow cytometry. Antibodies 8G2, 3B4, 7HD and 5F7G11 detected TK1 on the membrane of various cancer cell lines, including lung, prostate, colon and breast. No significant binding was detected on normal lymphocytes. Increased cytolysis of lung (~ 70%. p = 0.0001), breast (~ 70%, p = 0.0461) and colon (~ 50% p = 0.0216) cancer cells by effector cells was observed when anti-TK1 antibodies were added during ADCC experiments. CONCLUSIONS The antibodies developed showed potential to be used to detect and target TK1 on the membrane of various tumor cells. The targeting of TK1 in malignant cells using monoclonal antibodies may be a feasible approach for the elimination of high TK1 expressing tumor cells.
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Affiliation(s)
- Edwin J. Velazquez
- LSB 4007, Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602 USA
| | - Taylor D. Brindley
- LSB 4007, Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602 USA
| | | | - Eliza E. Bitter
- LSB 4007, Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602 USA
| | - Jordan D. Cress
- LSB 4007, Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602 USA
| | | | - Bradford K. Berges
- LSB 4007, Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602 USA
| | - Richard A. Robison
- LSB 4007, Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602 USA
| | - K. Scott Weber
- LSB 4007, Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602 USA
| | - Kim L. O’Neill
- LSB 4007, Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602 USA
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10
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Guerrero-Arguero I, Høj TR, Tass ES, Berges BK, Robison RA. A comparison of Chikungunya virus infection, progression, and cytokine profiles in human PMA-differentiated U937 and murine RAW264.7 monocyte derived macrophages. PLoS One 2020; 15:e0230328. [PMID: 32163514 PMCID: PMC7067478 DOI: 10.1371/journal.pone.0230328] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 02/27/2020] [Indexed: 11/29/2022] Open
Abstract
Chikungunya virus (CHIKV) is a mosquito-borne alphavirus that causes rash, fever and severe polyarthritis that can last for years in humans. Murine models display inflammation and macrophage infiltration only in the adjacent tissues at the site of inoculation, showing no signs of systemic polyarthritis. Monocyte-derived macrophages are one cell type suspected to contribute to a systemic CHIKV infection. The purpose of this study was to analyze differences in CHIKV infection in two different cell lines, human U937 and murine RAW264.7 monocyte derived macrophages. PMA-differentiated U937 and RAW264.7 macrophages were infected with CHIKV, and infectious virus production was measured by plaque assay and by reverse transcriptase quantitative PCR at various time points. Secreted cytokines in the supernatants were measured using cytometric bead arrays. Cytokine mRNA levels were also measured to supplement expression data. Here we show that CHIKV replicates more efficiently in human macrophages compared to murine macrophages. In addition, infected human macrophages produced around 10-fold higher levels of infectious virus when compared to murine macrophages. Cytokine induction by CHIKV infection differed between human and murine macrophages; IL-1, IL-6, IFN-γ, and TNF were significantly upregulated in human macrophages. This evidence suggests that CHIKV replicates more efficiently and induces a much greater pro-inflammatory cytokine profile in human macrophages, when compared to murine macrophages. This may shed light on the critical role that macrophages play in the CHIKV inflammatory response.
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Affiliation(s)
- Israel Guerrero-Arguero
- Department of Microbiology and Molecular Biology, College of Life Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Taalin R. Høj
- Department of Microbiology and Molecular Biology, College of Life Sciences, Brigham Young University, Provo, Utah, United States of America
| | - E. Shannon Tass
- Department of Statistics, College of Physical and Mathematical Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Bradford K. Berges
- Department of Microbiology and Molecular Biology, College of Life Sciences, Brigham Young University, Provo, Utah, United States of America
| | - Richard A. Robison
- Department of Microbiology and Molecular Biology, College of Life Sciences, Brigham Young University, Provo, Utah, United States of America
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11
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Haskell KJ, Schriever SR, Fonoimoana KD, Haws B, Hair BB, Wienclaw TM, Holmstead JG, Barboza AB, Berges ET, Heaton MJ, Berges BK. Antibiotic resistance is lower in Staphylococcus aureus isolated from antibiotic-free raw meat as compared to conventional raw meat. PLoS One 2018; 13:e0206712. [PMID: 30532208 PMCID: PMC6287829 DOI: 10.1371/journal.pone.0206712] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 11/23/2018] [Indexed: 12/18/2022] Open
Abstract
The frequent use of antibiotics contributes to antibiotic resistance in bacteria, resulting in an increase in infections that are difficult to treat. Livestock are commonly administered antibiotics in their feed, but there is current interest in raising animals that are only administered antibiotics during active infections. Staphylococcus aureus (SA) is a common pathogen of both humans and livestock raised for human consumption. SA has achieved high levels of antibiotic resistance, but the origins and locations of resistance selection are poorly understood. We determined the prevalence of SA and MRSA in conventional and antibiotic-free (AF) meat products, and also measured rates of antibiotic resistance in these isolates. We isolated SA from raw conventional turkey, chicken, beef, and pork samples and also from AF chicken and turkey samples. We found that SA contamination was common, with an overall prevalence of 22.6% (range of 2.8-30.8%) in conventional meats and 13.0% (range of 12.5-13.2%) in AF poultry meats. MRSA was isolated from 15.7% of conventional raw meats (range of 2.8-20.4%) but not from AF-free meats. The degree of antibiotic resistance in conventional poultry products was significantly higher vs AF poultry products for a number of different antibiotics, and while multi-drug resistant strains were relatively common in conventional meats none were detected in AF meats. The use of antibiotics in livestock contributes to high levels of antibiotic resistance in SA found in meat products. Our results support the use of AF conditions for livestock in order to prevent antibiotic resistance development in SA.
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Affiliation(s)
- Kyler J. Haskell
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Samuel R. Schriever
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Kenisi D. Fonoimoana
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Benjamin Haws
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Bryan B. Hair
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Trevor M. Wienclaw
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Joseph G. Holmstead
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Andrew B. Barboza
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Erik T. Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Matthew J. Heaton
- Department of Statistics, Brigham Young University, Provo, UT, United States of America
| | - Bradford K. Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
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12
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Fullwood RA, Low GM, Chase EP, Grasley M, Beal SS, McCrary IM, Daniels CW, Ingersoll K, Berges BK. The Kaposi's sarcoma-associated herpesvirus viral interleukin 6 gene affects metastasis and expression of B cell markers in a murine xenograft model. PLoS One 2018; 13:e0204947. [PMID: 30265712 PMCID: PMC6161906 DOI: 10.1371/journal.pone.0204947] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 09/16/2018] [Indexed: 12/16/2022] Open
Abstract
Kaposi’s sarcoma-associated herpesvirus (KSHV) is a cancer-causing virus in humans, primarily affecting AIDS patients. KSHV causes a range of cancers including Kaposi’s sarcoma, pleural effusion lymphoma and multicentric Castleman’s disease. Current methods available for treating these cancers are relatively ineffective, and new targets for therapy are needed. The KSHV viral homolog of interleukin-6 gene (vIL-6) may play a significant role in tumor development and may serve as a new anti-cancer target, but its role in tumor formation is only partially understood. Here, a novel animal model was used to study how vIL-6 affects tumor development. Highly immune-deficient Rag2-/-γc-/- mice were transplanted with an immortalized human B cell line (BJAB) harboring either wild-type (WT) KSHV or a mutant strain lacking vIL-6 ΔvIL-6). Solid tumors developed and total tumor mass and the number of tumors were characterized. The vIL-6 gene had no significant impact on tumor mass, but significantly more tumors were detected when vIL-6 was present. Significant differences in expression of B cell markers in cells from extracted tumors were detected based upon the presence of vIL-6. B cell markers in tumor cells were also compared to the same cell type in culture, prior to xenotransplantation; B cell markers were mostly downregulated during tumor formation and these changes did not differ based upon the presence of vIL-6. The only marker that significantly increased in expression during tumor development was CD30. Tumor blood vessels were quantified to determine if more angiogenesis occurred with vIL-6-expressing virus, but there was no significant difference. These data indicate that vIL-6 plays a role in KSHV tumor formation in B cells in vivo. Further investigation into how vIL-6 manipulates CD30 expression may shed insight into KSHV oncogenesis, and may identify how vIL-6 can be targeted.
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MESH Headings
- Animals
- B-Lymphocytes/metabolism
- B-Lymphocytes/pathology
- B-Lymphocytes/virology
- Biomarkers, Tumor/biosynthesis
- Biomarkers, Tumor/genetics
- Gene Expression Regulation, Neoplastic
- Herpesvirus 8, Human/genetics
- Herpesvirus 8, Human/metabolism
- Heterografts
- Humans
- Interleukin-6/biosynthesis
- Interleukin-6/genetics
- Mice
- Mice, Knockout
- Neoplasm Metastasis
- Neoplasm Proteins/biosynthesis
- Neoplasm Proteins/genetics
- Neoplasm Transplantation
- Neoplasms, Plasma Cell/genetics
- Neoplasms, Plasma Cell/metabolism
- Neoplasms, Plasma Cell/pathology
- Neoplasms, Plasma Cell/virology
- Viral Proteins/biosynthesis
- Viral Proteins/genetics
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Affiliation(s)
- R. Amy Fullwood
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Gregory M. Low
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Emily P. Chase
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Meagan Grasley
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Soren S. Beal
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Ian M. McCrary
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Christian W. Daniels
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Kayleigh Ingersoll
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
| | - Bradford K. Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, United States of America
- * E-mail:
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13
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Cornaby C, Tanner A, Stutz EW, Poole BD, Berges BK. Piracy on the molecular level: human herpesviruses manipulate cellular chemotaxis. J Gen Virol 2015; 97:543-560. [PMID: 26669819 DOI: 10.1099/jgv.0.000370] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Cellular chemotaxis is important to tissue homeostasis and proper development. Human herpesvirus species influence cellular chemotaxis by regulating cellular chemokines and chemokine receptors. Herpesviruses also express various viral chemokines and chemokine receptors during infection. These changes to chemokine concentrations and receptor availability assist in the pathogenesis of herpesviruses and contribute to a variety of diseases and malignancies. By interfering with the positioning of host cells during herpesvirus infection, viral spread is assisted, latency can be established and the immune system is prevented from eradicating viral infection.
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Affiliation(s)
- Caleb Cornaby
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - Anne Tanner
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - Eric W Stutz
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - Brian D Poole
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - Bradford K Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
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14
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Jensen KC, Hair BB, Wienclaw TM, Murdock MH, Hatch JB, Trent AT, White TD, Haskell KJ, Berges BK. Isolation and Host Range of Bacteriophage with Lytic Activity against Methicillin-Resistant Staphylococcus aureus and Potential Use as a Fomite Decontaminant. PLoS One 2015; 10:e0131714. [PMID: 26131892 PMCID: PMC4488860 DOI: 10.1371/journal.pone.0131714] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 06/04/2015] [Indexed: 11/29/2022] Open
Abstract
Staphylococcus aureus (SA) is a commensal bacterium and opportunistic pathogen commonly associated with humans and is capable of causing serious disease and death including sepsis, pneumonia, and meningitis. Methicillin-resistant SA (MRSA) isolates are typically resistant to many available antibiotics with the common exception of vancomycin. The presence of vancomycin resistance in some SA isolates combined with the current heavy use of vancomycin to treat MRSA infections indicates that MRSA may achieve broad resistance to vancomycin in the near future. New MRSA treatments are clearly needed. Bacteriophages (phages) are viruses that infect bacteria, commonly resulting in death of the host bacterial cell. Phage therapy entails the use of phage to treat or prevent bacterial infections. In this study, 12 phages were isolated that can replicate in human SA and/or MRSA isolates as a potential way to control these infections. 5 phage were discovered through mitomycin C induction of prophage and 7 others as extracellular viruses. Primary SA strains were also isolated from environmental sources to be used as tools for phage discovery and isolation as well as to examine the target cell host range of the phage isolates by spot testing. Primary isolates were tested for susceptibility to oxacillin in order to determine which were MRSA. Experiments were performed to assess the host range and killing potential of newly discovered phage, and significant reductions in bacterial load were detected. We explored the utility of some phage to decontaminate fomites (glass and cloth) and found a significant reduction in colony forming units of MRSA following phage treatment, including tests of a phage cocktail against a cocktail of MRSA isolates. Our findings suggest that phage treatment can be used as an effective tool to decontaminate human MRSA from both hard surfaces and fabrics.
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Affiliation(s)
- Kyle C. Jensen
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, 84602, United States of America
| | - Bryan B. Hair
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, 84602, United States of America
| | - Trevor M. Wienclaw
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, 84602, United States of America
| | - Mark H. Murdock
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, 84602, United States of America
| | - Jacob B. Hatch
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, 84602, United States of America
| | - Aaron T. Trent
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, 84602, United States of America
| | - Tyler D. White
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, 84602, United States of America
| | - Kyler J. Haskell
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, 84602, United States of America
| | - Bradford K. Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, Utah, 84602, United States of America
- * E-mail:
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15
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Tanner A, Hallam SJ, Nielsen SJ, Cuadra GI, Berges BK. Development of human B cells and antibodies following human hematopoietic stem cell transplantation to Rag2(-/-)γc(-/-) mice. Transpl Immunol 2015; 32:144-50. [PMID: 25843523 DOI: 10.1016/j.trim.2015.03.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 03/25/2015] [Accepted: 03/26/2015] [Indexed: 11/19/2022]
Abstract
Humanized mice represent a valuable model system to study the development and functionality of the human immune system. In the RAG-hu mouse model highly immunodeficient Rag2(-/-)γc(-/-) mice are transplanted with human CD34(+) hematopoietic stem cells, resulting in human hematopoiesis and a predominant production of B and T lymphocytes. Human adaptive immune responses have been detected towards a variety of antigens in humanized mice but both cellular and humoral immune responses tend to be weak and sporadically detected. The underlying mechanisms for inconsistent responses are poorly understood. Here, we analyzed the kinetics of human B cell development and antibody production in RAG-hu mice to better understand the lack of effective antibody responses. We found that T cell levels in blood did not significantly change from 8 to 28 weeks post-engraftment, while B cells reached a peak at 14 weeks. Concentrations of 3 antibody classes (IgM, IgG, IgA) were found to be at levels about 0.1% or less of normal human levels, but human antibodies were still detected up to 32 weeks after engraftment. Human IgM was detected in 92.5% of animals while IgG and IgA were detected in about half of animals. We performed flow cytometric analysis of human B cells in bone marrow, spleen, and blood to examine the presence of precursor B cells, immature B cells, naïve B cells, and plasma B cells. We detected high levels of surface IgM(+) B cells (immature and naïve B cells) and low levels of plasma B cells in these organs, suggesting that B cells do not mature properly in this model. Low levels of human T cells in the spleen were observed, and we suggest that the lack of T cell help may explain poor B cell development and antibody responses. We conclude that human B cells that develop in humanized mice do not receive the signals necessary to undergo class-switching or to secrete antibody effectively, and we discuss strategies to potentially overcome these barriers.
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Affiliation(s)
- Anne Tanner
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - Steven J Hallam
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - Stanton J Nielsen
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - German I Cuadra
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - Bradford K Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA.
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16
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Horvat B, Berges BK, Lusso P. Recent developments in animal models for human herpesvirus 6A and 6B. Curr Opin Virol 2014; 9:97-103. [PMID: 25462440 DOI: 10.1016/j.coviro.2014.09.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2014] [Revised: 09/18/2014] [Accepted: 09/23/2014] [Indexed: 12/30/2022]
Abstract
Progress in the identification of suitable animal models for human herpesvirus (HHV)-6A and HHV-6B infections has been slow. Recently, new models have been established, mainly for HHV-6A, which reproduce some pathological features seen in humans. Neuroinflammatory signs were observed in infected marmosets and CD46-transgenic mice; although viral replication was not prominent, persistence of viral DNA and specific immunologic responses were detected, suggesting an immune-mediated pathogenic mechanism. Pig-tailed macaques showed robust viral replication concomitant with acute-phase symptoms, and provided a model to study the effects of HHV-6A on AIDS progression. In humanized mice, viral replication was less evident, but infection led to T-cell alterations. Altogether, these recent developments have opened new perspectives for studying the pathogenic role of HHV-6A in humans.
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Affiliation(s)
- Branka Horvat
- CIRI, International Center for Infectiology Research, France; Inserm, U1111, Lyon, France; CNRS, UMR5308, Lyon, France; Université Lyon 1, Lyon, France; Ecole Normale Supérieure de Lyon, Lyon, France
| | - Bradford K Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - Paolo Lusso
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
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17
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Abstract
The human herpesviruses (HHVs) are remarkably successful human pathogens, with some members of the family successfully establishing infection in the vast majority of humans worldwide. Although many HHV infections result in asymptomatic infection or mild disease, there are rare cases of severe disease and death found with nearly every HHV. Many of the pathogenic mechanisms of these viruses are poorly understood, and in many cases, effective antiviral drugs are lacking. Only a single vaccine exists for the HHVs and researchers have been unable to develop treatments to cure the persistent infections associated with HHVs. A major hindrance to HHV research has been the lack of suitable animal models, with the notable exception of the herpes simplex viruses. One promising area for HHV research is the use of humanized mouse models, in which human cells or tissues are transplanted into immunodeficient mice. Current humanized mouse models mostly transplant human haematopoietic stem cells (HSCs), resulting in the production of a variety of human immune cells. Although all HHVs are thought to infect human immune cells, the beta- and gammaherpesviruses extensively infect and establish latency in these cells. Thus, mice humanized with HSCs hold great promise to study these herpesviruses. In this review, we provide a historical perspective on the use of both older and newer humanized mouse models to study HHV infections. The focus is on current developments in using humanized mice to study mechanisms of HHV-induced pathogenesis, human immune responses to HHVs and effectiveness of antiviral drugs.
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Affiliation(s)
- Bradford K Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
| | - Anne Tanner
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA
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18
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Abstract
Engraftment of immunodeficient mice with a human immune system (humanized mice) provides a model system to study pathogens that target human immune cells. Humanized Rag2(-/-)γc(-/-) mice produce the major target cells of HIV-1 and these cells can be detected in primary and secondary lymphoid tissues, as well as in the vaginal and rectal mucosa and brain tissues. This humanized model has already yielded important findings on HIV-1 transmission, mechanisms of pathogenesis, and testing of novel antiviral strategies in vivo. Here, we describe the methods used to infect humanized mice with HIV-1 and to characterize plasma viral load and blood CD4(+) T cell depletion.
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Affiliation(s)
- Freddy M Sanchez
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
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19
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Tanner A, Taylor SE, Decottignies W, Berges BK. Humanized mice as a model to study human hematopoietic stem cell transplantation. Stem Cells Dev 2013; 23:76-82. [PMID: 23962058 DOI: 10.1089/scd.2013.0265] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Hematopoietic stem cell (HSC) transplantation has the potential to treat a variety of human diseases, including genetic deficiencies, immune disorders, and to restore immunity following cancer treatment. However, there are several obstacles that prevent effective HSC transplantation in humans. These include finding a matched donor, having a sufficient number of cells for the transplant, and the potency of the cells in the transplant. Ethical issues prevent effective research in humans that could provide insight into ways to overcome these obstacles. Highly immunodeficient mice can be transplanted with human HSCs and this process is accompanied by HSC homing to the murine bone marrow. This is followed by stem cell expansion, multilineage hematopoiesis, long-term engraftment, and functional human antibody and cellular immune responses. As such, humanized mice serve as a model for human HSC transplantation. A variety of conditions have been analyzed for their impact on HSC transplantation to produce humanized mice, including the type and source of cells used in the transplant, the number of cells transplanted, the expansion of cells with various protocols, and the route of introduction of cells into the mouse. In this review, we summarize what has been learned about HSC transplantation using humanized mice as a recipient model and we comment on how these models may be useful to future preclinical research to determine more effective ways to expand HSCs and to determine their repopulating potential in vivo.
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Affiliation(s)
- Anne Tanner
- Department of Microbiology and Molecular Biology, Brigham Young University , Provo, Utah
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20
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Abstract
Mice reconstituted with human immune cells represent a model to study the development and functionality of the human immune system. Recent improvements in humanized mice have resulted in multi-lineage hematopoiesis, prolonged human cell engraftment that is detectable in many mouse organs, and the ability to generate de novo human innate and adaptive immune responses. Here, we describe the methods used to produce and characterize humanized Rag2(-/-)γc(-/-) mice.
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Affiliation(s)
- Freddy M Sanchez
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
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21
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Berges BK, Rowan MR. The utility of the new generation of humanized mice to study HIV-1 infection: transmission, prevention, pathogenesis, and treatment. Retrovirology 2011; 8:65. [PMID: 21835012 PMCID: PMC3170263 DOI: 10.1186/1742-4690-8-65] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Accepted: 08/11/2011] [Indexed: 11/10/2022] Open
Abstract
Substantial improvements have been made in recent years in the ability to engraft human cells and tissues into immunodeficient mice. The use of human hematopoietic stem cells (HSCs) leads to multi-lineage human hematopoiesis accompanied by production of a variety of human immune cell types. Population of murine primary and secondary lymphoid organs with human cells occurs, and long-term engraftment has been achieved. Engrafted cells are capable of producing human innate and adaptive immune responses, making these models the most physiologically relevant humanized animal models to date. New models have been successfully infected by a variety of strains of Human Immunodeficiency Virus Type 1 (HIV-1), accompanied by virus replication in lymphoid and non-lymphoid organs, including the gut-associated lymphoid tissue, the male and female reproductive tracts, and the brain. Multiple forms of virus-induced pathogenesis are present, and human T cell and antibody responses to HIV-1 are detected. These humanized mice are susceptible to a high rate of rectal and vaginal transmission of HIV-1 across an intact epithelium, indicating the potential to study vaccines and microbicides. Antiviral drugs, siRNAs, and hematopoietic stem cell gene therapy strategies have all been shown to be effective at reducing viral load and preventing or reversing helper T cell loss in humanized mice, indicating that they will serve as an important preclinical model to study new therapeutic modalities. HIV-1 has also been shown to evolve in response to selective pressures in humanized mice, thus showing that the model will be useful to study and/or predict viral evolution in response to drug or immune pressures. The purpose of this review is to summarize the findings reported to date on all new humanized mouse models (those transplanted with human HSCs) in regards to HIV-1 sexual transmission, pathogenesis, anti-HIV-1 immune responses, viral evolution, pre- and post-exposure prophylaxis, and gene therapeutic strategies.
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Affiliation(s)
- Bradford K Berges
- Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT 84602, USA.
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22
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Berges BK, Akkina SR, Remling L, Akkina R. Humanized Rag2(-/-)gammac(-/-) (RAG-hu) mice can sustain long-term chronic HIV-1 infection lasting more than a year. Virology 2009; 397:100-3. [PMID: 19922970 DOI: 10.1016/j.virol.2009.10.034] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2009] [Revised: 10/16/2009] [Accepted: 10/20/2009] [Indexed: 11/26/2022]
Abstract
HIV-1 infection is characterized by life-long viral persistence and continued decline of helper CD4 T cells. The new generation of humanized mouse models that encompass RAG-hu, hNOG and BLT mice have been shown to be susceptible to HIV-1 infection and display CD4 T cell loss. Productive infection has been demonstrated with both R5 and X4 tropic strains of HIV-1 via direct injection as well as mucosal exposure. However the duration of infection in these mice was evaluated for a limited time lasting only weeks post infection, and it is not established how long the viremia can be sustained, and if the CD4 T cell loss persists throughout the life of the infected humanized mice. In the present study we followed the HIV-1 infected RAG-hu mice to determine the long-term viral persistence and CD4 T cell levels. Our results showed that viremia persists life-long lasting for more than a year, and that CD4 T cell levels display a continuous declining trend as seen in the human. These studies provide a chronic HIV-1 infection humanized mouse model that can be used to dissect viral latency, long-term drug evaluation and immune-based therapies.
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Affiliation(s)
- Bradford K Berges
- Department of Microbiology, Immunology, and Pathology, Colorado State University, 329 Pathology, Fort Collins, CO 80523, USA.
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Abstract
An imposing obstacle to gene therapy is the inability to transduce all of the necessary cells in a target organ. This certainly applies to gene transfer to the brain, especially when one considers the challenges involved in scaling up transduction from animal models to use in the clinic. Non-neurotropic viral gene transfer vectors (e.g., adenovirus, adeno-associated virus, and lentivirus) do not spread very far in the nervous system, and consequently these vectors transduce brain regions mostly near the injection site in adult animals. This indicates that numerous, well-spaced injections would be required to achieve widespread transduction in a large brain with these vectors. In contrast, herpes simplex virus type 1 (HSV-1) is a promising vector for widespread gene transfer to the brain owing to the innate ability of the virus to spread through the nervous system and form latent infections in neurons that last for the lifetime of the infected individual. In this review, we summarize the published literature of the transduction patterns produced by attenuated HSV-1 vectors in small animals as a function of the injection site, and discuss the implications of the distribution for widespread gene transfer to the large animal brain.
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Affiliation(s)
- Bradford K Berges
- Department of Microbiology, School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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Berges BK, Akkina SR, Folkvord JM, Connick E, Akkina R. Mucosal transmission of R5 and X4 tropic HIV-1 via vaginal and rectal routes in humanized Rag2-/- gammac -/- (RAG-hu) mice. Virology 2008; 373:342-51. [PMID: 18207484 DOI: 10.1016/j.virol.2007.11.020] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2007] [Revised: 10/16/2007] [Accepted: 11/12/2007] [Indexed: 01/01/2023]
Abstract
Studies on HIV-1 mucosal transmission to evaluate early events in pathogenesis and the development of effective preventive/prophylactic methods have thus far been hampered by the lack of a suitable animal model susceptible to HIV-1 infection by either vaginal and/or rectal routes. In this regard, while primate-SIV/SHIV and cat-FIV models provided useful surrogate platforms to derive comparative data, these viruses are distinct and different from that of HIV-1. Therefore an optimal model that permits direct study of HIV-1 transmission via mucosal routes is highly desirable. The new generation of humanized NOD/SCID BLT, NOD/SCIDgammac(-/-), and Rag2(-/-)gammac(-/-) mouse models show great promise to achieve this goal. Here, we show that humanized Rag2(-/-)gammac(-/-) mice (RAG-hu) engrafted with CD34 hematopoietic progenitor cells harbor HIV-1-susceptible human cells in the rectal and vaginal mucosa and are susceptible to HIV-1 infection when exposed to cell-free HIV-1 either via vagina or rectum. Infection could be established without any prior hormonal conditioning or mucosal abrasion. Both R5 and X4 tropic viruses were capable of mucosal infection resulting in viremia and associated helper T cell depletion. There was systemic spread of the virus with infected cells detected in different organs including the intestinal mucosa. R5 virus was highly efficient in mucosal transmission by both routes whereas X4 virus was relatively less efficient in causing infection. HIV-1 infection of RAG-hu mice by vaginal and rectal routes as shown here represents the first in vivo model of HIV-1 transmission across intact mucosal barriers and as such may prove very useful for studying early events in HIV-1 pathogenesis in vivo, as well as the testing of microbicides, anti-HIV vaccines/therapeutics, and other novel strategies to prevent HIV-1 transmission.
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Affiliation(s)
- Bradford K Berges
- Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO 80523, USA
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Berges BK, Wheat WH, Palmer BE, Connick E, Akkina R. HIV-1 infection and CD4 T cell depletion in the humanized Rag2-/-gamma c-/- (RAG-hu) mouse model. Retrovirology 2006; 3:76. [PMID: 17078891 PMCID: PMC1635423 DOI: 10.1186/1742-4690-3-76] [Citation(s) in RCA: 136] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2006] [Accepted: 11/01/2006] [Indexed: 11/29/2022] Open
Abstract
Background The currently well-established humanized mouse models, namely the hu-PBL-SCID and SCID-hu systems played an important role in HIV pathogenesis studies. However, despite many notable successes, several limitations still exist. They lack multi-lineage human hematopoiesis and a functional human immune system. These models primarily reflect an acute HIV infection with rapid CD4 T cell loss thus limiting pathogenesis studies to a short-term period. The new humanized Rag2-/-γc-/- mouse model (RAG-hu) created by intrahepatic injection of CD34 hematopoietic stem cells sustains long-term multi-lineage human hematopoiesis and is capable of mounting immune responses. Thus, this model shows considerable promise to study long-term in vivo HIV infection and pathogenesis. Results Here we demonstrate that RAG-hu mice produce human cell types permissive to HIV-1 infection and that they can be productively infected by HIV-1 ex vivo. To assess the capacity of these mice to sustain long-term infection in vivo, they were infected by either X4-tropic or R5-tropic HIV-1. Viral infection was assessed by PCR, co-culture, and in situ hybridization. Our results show that both X4 and R5 viruses are capable of infecting RAG-hu mice and that viremia lasts for at least 30 weeks. Moreover, HIV-1 infection leads to CD4 T cell depletion in peripheral blood and thymus, thus mimicking key aspects of HIV-1 pathogenesis. Additionally, a chimeric HIV-1 NL4-3 virus expressing a GFP reporter, although capable of causing viremia, failed to show CD4 T cell depletion possibly due to attenuation. Conclusion The humanized RAG-hu mouse model, characterized by its capacity for sustained multi-lineage human hematopoiesis and immune response, can support productive HIV-1 infection. Both T cell and macrophage tropic HIV-1 strains can cause persistent infection of RAG-hu mice resulting in CD4 T cell loss. Prolonged viremia in the context of CD4 T cell depletion seen in this model mirrors the main features of HIV infection in the human. Thus, the RAG-hu mouse model of HIV-1 infection shows great promise for future in vivo pathogenesis studies, evaluation of new drug treatments, vaccines and novel gene therapy strategies.
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Affiliation(s)
- Bradford K Berges
- Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO 80523, USA
| | - William H Wheat
- Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO 80523, USA
| | - Brent E Palmer
- Department of Medicine, University of Colorado Health Sciences Center, Denver, CO 80262, USA
| | - Elizabeth Connick
- Division of Infectious Disease, University of Colorado Health Sciences Center, Denver, CO 80262, USA
| | - Ramesh Akkina
- Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO 80523, USA
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Berges BK, Yellayi S, Karolewski BA, Miselis RR, Wolfe JH, Fraser NW. Widespread Correction of Lysosomal Storage in the Mucopolysaccharidosis Type VII Mouse Brain with a Herpes Simplex Virus Type 1 Vector Expressing β-Glucuronidase. Mol Ther 2006; 13:859-69. [PMID: 16515890 DOI: 10.1016/j.ymthe.2005.12.017] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2005] [Revised: 12/14/2005] [Accepted: 12/22/2005] [Indexed: 11/19/2022] Open
Abstract
We have inoculated a herpes simplex virus type 1 (HSV-1) vector into a variety of sites in the mouse brain and assayed the regions of latency and expression of a beta-glucuronidase (GUSB) cDNA from the latency-associated transcript promoter. Injection sites used were somatosensory cortex, visual cortex, striatum, dorsal hippocampus, and CSF spaces. Latent vector was detected in regions at a distance from the respective injection sites, consistent with axonal transport of vector. Regions of GUSB activity varied by injection site and included cerebral cortex, striatum, thalamus, hypothalamus, substantia nigra, hippocampus, midbrain, pons, medulla, cerebellum, and spinal cord. After a single injection, GUSB enzymatic activity reached wild-type levels in several brain regions. GUSB was found in some areas without any detectable vector, indicative of axonal transport of GUSB enzyme. GUSB-deficient mice, which have the lysosomal storage disease mucopolysaccharidosis (MPS) VII, have lysosomal storage lesions in cells throughout the brain. Adult MPS VII mice treated by injection of vector into a single site on each side of the brain had correction of storage lesions in a large volume of brain. The potential for long-term, widespread correction of lysosomal storage diseases with HSV-1 vectors is discussed.
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Affiliation(s)
- Bradford K Berges
- Department of Microbiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
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Berges BK, Wolfe JH, Fraser NW. Stable Levels of Long-Term Transgene Expression Driven by the Latency-Associated Transcript Promoter in a Herpes Simplex Virus Type 1 Vector. Mol Ther 2005; 12:1111-9. [PMID: 16122987 DOI: 10.1016/j.ymthe.2005.06.478] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2005] [Revised: 06/24/2005] [Accepted: 06/24/2005] [Indexed: 10/25/2022] Open
Abstract
Previous gene transfer studies of the herpes simplex virus type 1 (HSV-1) using the latency-associated transcript (LAT) promoter have reported a decrease in transgene expression in the brain over time, but the extent of this decrease has not been measured and it is unknown if expression eventually stabilizes. We examined LAT promoter-mediated transgene expression in the mouse brain for 1 year following intracranial injection with a HSV-1 vector expressing human beta-glucuronidase (GUSB). The vector genome copy number remained stable from 2 to 52 weeks. Quantitative reverse transcriptase PCR detected a peak of LAT intron expression at 2 weeks (corresponding to the end of the acute phase of viral infection), followed by stable expression during latency (13-52 weeks). The number of GUSB-positive cells also had a peak in the acute phase and then was stable during latency (13-52 weeks). GUSB enzymatic activity was maintained at 11% of normal at 6 and 12 months, indicating that the LAT promoter is capable of driving stable transgene expression in the brain.
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Affiliation(s)
- B K Berges
- Department of Microbiology, School of Medicine, 319 Johnson Pavilion, University of Pennsylvania, Philadelphia, PA 19104, USA
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