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Hybiske K, Paktinat S, Newman K, Patton D, Khosropour C, Roxby AC, Mugo NR, Oluoch L, Ngure K, Suchland R, Hladik F, Vojtech L. Antibodies from chlamydia-infected individuals facilitate phagocytosis via Fc receptors. Infect Immun 2024; 92:e0050323. [PMID: 38451079 PMCID: PMC11003224 DOI: 10.1128/iai.00503-23] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Accepted: 02/16/2024] [Indexed: 03/08/2024] Open
Abstract
Non-neutralizing functions of antibodies, including phagocytosis, may play a role in Chlamydia trachomatis (CT) infection, but these functions have not been studied and assays are lacking. We utilized a flow-cytometry-based assay to determine whether serum samples from a well-characterized cohort of CT-infected and naïve control individuals enhanced phagocytosis via Fc-receptor-expressing THP-1 cells, and whether this activity correlated with antibody titers. Fc-receptor-mediated phagocytosis was detected only in CT+ donors. Phagocytosis generally did not correlate well with antibody titer. In addition, we found that complement from both CT+ and negative individuals enhanced phagocytosis of CT into primary neutrophils. These results suggest that anti-CT antibodies can have functions that are not reflected by titer. This method could be used to quantitively measure Fc-receptor-mediated function of anti-CT antibodies or complement activity and could reveal new immune correlates of protection.
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Affiliation(s)
- Kevin Hybiske
- Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Shahrokh Paktinat
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, USA
| | - Katherine Newman
- Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Dorothy Patton
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, USA
| | | | - Alison C. Roxby
- Department of Medicine, University of Washington, Seattle, Washington, USA
- Department of Global Health, University of Washington, Seattle, Washington, USA
| | - Nelly R. Mugo
- Department of Global Health, University of Washington, Seattle, Washington, USA
- Centre for Clinical Research, Kenya Medical Research Institute, Nairobi, Kenya
| | - Lynda Oluoch
- Centre for Clinical Research, Kenya Medical Research Institute, Nairobi, Kenya
| | - Kenneth Ngure
- Department of Global Health, University of Washington, Seattle, Washington, USA
- School of Public Health, Jomo Kenyatta University of Agriculture and Technology, Nairobi, Kenya
| | - Robert Suchland
- Department of Medicine, University of Washington, Seattle, Washington, USA
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, USA
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, USA
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Vojtech L, Paktinat S, Luu T, Teichmann S, Soge OO, Suchland R, Barbee LA, Khosropour CM. Use of viability PCR for detection of live Chlamydia trachomatis in clinical specimens. Front Reprod Health 2023; 5:1199740. [PMID: 37601895 PMCID: PMC10436598 DOI: 10.3389/frph.2023.1199740] [Citation(s) in RCA: 2] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 07/18/2023] [Indexed: 08/22/2023] Open
Abstract
Background The current testing approach to diagnose Chlamydia trachomatis (CT) infection relies on nucleic acid amplification tests (NAATs). These tests are highly sensitive, but do not distinguish between active infection and residual bacterial nucleic acid which may remain after resolution of infection, or via cross-contamination. Better methods to assess the viability of CT detected in clinical samples would be useful in determining the relevance of CT detection in a variety of clinical settings. The goal of this study was to test viability PCR (vPCR) as a method to distinguish viable bacteria from non-viable CT. Methods The vPCR relies on a propidium monoazide dye (PMAxx), which intercalates into accessible DNA from dead organisms and prevents their detection in a PCR assay for the CT ompA gene. We used digital PCR to quantify absolute genome copy numbers from samples. We validated the vPCR approach using laboratory stocks of CT with known viability. Then, we tested total DNA, viable CT DNA, and culture results from 18 clinical vaginal specimens and 25 rectal clinical specimens, all of which had tested positive by NAAT. Results In laboratory stocks of CT, vPCR using defined ratios of heat-killed to live bacteria tracked closely with expected results. In vaginal clinical specimens, vPCR and total DNA results were correlated, though total DNA genomes outnumbered viable genomes by 2.2-52.6-fold more copies. As expected, vPCR detected more total genomes than culture results. Both vPCR and total DNA correlated with culture results (Spearman correlation R = 0.8425 for total DNA and 0.8056 for vPCR). Ten rectal NAAT positive specimens were negative by total DNA PCR, vPCR, and were negative or inconclusive by culture. Of the 6 rectal specimens that were culture positive, all were total DNA and vPCR positive. vPCR additionally detected viable bacterial DNA in 8 specimens which were NAAT + and culture negative, though levels were very low (mean 1,357 copies/ml). Conclusions vPCR is a fast and easy method to assess viability in clinical specimens and is more correlated with culture results than total DNA PCR. Inconsistent ratios between total DNA and vPCR results suggest that the amount of dead bacteria varies considerably in clinical specimens. Results from rectal specimens suggest that many NAAT positive specimens do not in fact represent live replicating bacteria, and likely result in significant overuse of unnecessary antibiotics.
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Affiliation(s)
- Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Shahrokh Paktinat
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Tiffany Luu
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Stella Teichmann
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Olusegun O. Soge
- Department of Medicine, University of Washington, Seattle, WA, United States
- Department of Global Health, University of Washington, Seattle, WA, United States
| | - Robert Suchland
- Department of Medicine, University of Washington, Seattle, WA, United States
| | - Lindley A. Barbee
- Department of Medicine, University of Washington, Seattle, WA, United States
- Public Health – Seattle and King County, HIV/STD Program, Seattle, WA, United States
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Echesabal-Chen J, Huang K, Vojtech L, Oladosu O, Esobi I, Sachdeva R, Vyavahare N, Jo H, Stamatikos A. Constructing Lipoparticles Capable of Endothelial Cell-Derived Exosome-Mediated Delivery of Anti-miR-33a-5p to Cultured Macrophages. Curr Issues Mol Biol 2023; 45:5631-5644. [PMID: 37504271 PMCID: PMC10378689 DOI: 10.3390/cimb45070355] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 06/26/2023] [Accepted: 07/01/2023] [Indexed: 07/29/2023] Open
Abstract
Atherosclerosis is driven by intimal arterial macrophages accumulating cholesterol. Atherosclerosis also predominantly occurs in areas consisting of proinflammatory arterial endothelial cells. At time of writing, there are no available clinical treatments that precisely remove excess cholesterol from lipid-laden intimal arterial macrophages. Delivery of anti-miR-33a-5p to macrophages has been shown to increase apoAI-mediated cholesterol efflux via ABCA1 upregulation but delivering transgenes to intimal arterial macrophages is challenging due to endothelial cell barrier integrity. In this study, we aimed to test whether lipoparticles targeting proinflammatory endothelial cells can participate in endothelial cell-derived exosome exploitation to facilitate exosome-mediated transgene delivery to macrophages. We constructed lipoparticles that precisely target the proinflammatory endothelium and contain a plasmid that expresses XMOTIF-tagged anti-miR-33a-5p (LP-pXMoAntimiR33a5p), as XMOTIF-tagged small RNA demonstrates the capacity to be selectively shuttled into exosomes. The cultured cells used in our study were immortalized mouse aortic endothelial cells (iMAECs) and RAW 264.7 macrophages. From our results, we observed a significant decrease in miR-33a-5p expression in macrophages treated with exosomes released basolaterally by LPS-challenged iMAECs incubated with LP-pXMoAntimiR33a5p when compared to control macrophages. This decrease in miR-33a-5p expression in the treated macrophages caused ABCA1 upregulation as determined by a significant increase in ABCA1 protein expression in the treated macrophages when compared to the macrophage control group. The increase in ABCA1 protein also simulated ABCA1-dependent cholesterol efflux in treated macrophages-as we observed a significant increase in apoAI-mediated cholesterol efflux-when compared to the control group of macrophages. Based on these findings, strategies that involve combining proinflammatory-targeting lipoparticles and exploitation of endothelial cell-derived exosomes appear to be promising approaches for delivering atheroprotective transgenes to lipid-laden arterial intimal macrophages.
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Affiliation(s)
- Jing Echesabal-Chen
- Department of Food, Nutrition and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
| | - Kun Huang
- Department of Food, Nutrition and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
| | - Lucia Vojtech
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA 98109, USA
| | - Olanrewaju Oladosu
- Department of Food, Nutrition and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
| | - Ikechukwu Esobi
- Department of Food, Nutrition and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
| | - Rakesh Sachdeva
- Department of Chemistry, Clemson University, Clemson, SC 29634, USA
| | - Naren Vyavahare
- Department of Bioengineering, Clemson University, Clemson, SC 29634, USA
| | - Hanjoong Jo
- Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30322, USA
| | - Alexis Stamatikos
- Department of Food, Nutrition and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
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Huang K, Pitman M, Oladosu O, Echesabal-Chen J, Vojtech L, Esobi I, Larsen J, Jo H, Stamatikos A. The Impact of MiR-33a-5p Inhibition in Pro-Inflammatory Endothelial Cells. Diseases 2023; 11:88. [PMID: 37489440 PMCID: PMC10366879 DOI: 10.3390/diseases11030088] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Revised: 06/18/2023] [Accepted: 06/21/2023] [Indexed: 07/26/2023] Open
Abstract
Evidence suggests cholesterol accumulation in pro-inflammatory endothelial cells (EC) contributes to triggering atherogenesis and driving atherosclerosis progression. Therefore, inhibiting miR-33a-5p within inflamed endothelium may prevent and treat atherosclerosis by enhancing apoAI-mediated cholesterol efflux by upregulating ABCA1. However, it is not entirely elucidated whether inhibition of miR-33a-5p in pro-inflammatory EC is capable of increasing ABCA1-dependent cholesterol efflux. In our study, we initially transfected LPS-challenged, immortalized mouse aortic EC (iMAEC) with either pAntimiR33a5p plasmid DNA or the control plasmid, pScr. We detected significant increases in both ABCA1 protein expression and apoAI-mediated cholesterol efflux in iMAEC transfected with pAntimiR33a5p when compared to iMAEC transfected with pScr. We subsequently used polymersomes targeting inflamed endothelium to deliver either pAntimiR33a5p or pScr to cultured iMAEC and showed that the polymersomes were selective in targeting pro-inflammatory iMAEC. Moreover, when we exposed LPS-challenged iMAEC to these polymersomes, we observed a significant decrease in miR-33a-5p expression in iMAEC incubated with polymersomes containing pAntimR33a5p versus control iMAEC. We also detected non-significant increases in both ABCA1 protein and apoAI-mediated cholesterol in iMAEC exposed to polymersomes containing pAntimR33a5p when compared to control iMAEC. Based on our results, inhibiting miR-33a-5p in pro-inflammatory EC exhibits atheroprotective effects, and so precisely delivering anti-miR-33a-5p to these cells is a promising anti-atherogenic strategy.
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Affiliation(s)
- Kun Huang
- Department of Food, Nutrition, and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
| | - Mark Pitman
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634, USA
| | - Olanrewaju Oladosu
- Department of Food, Nutrition, and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
| | - Jing Echesabal-Chen
- Department of Food, Nutrition, and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
| | - Lucia Vojtech
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA 98109, USA
| | - Ikechukwu Esobi
- Department of Food, Nutrition, and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
| | - Jessica Larsen
- Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, SC 29634, USA
- Department of Bioengineering, Clemson University, Clemson, SC 29634, USA
| | - Hanjoong Jo
- Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30322, USA
| | - Alexis Stamatikos
- Department of Food, Nutrition, and Packaging Sciences, Clemson University, Clemson, SC 29634, USA
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Jung SR, Kim J, Vojtech L, Vaughan JC, Chiu DT. Error-Correction Method for High-Throughput Sizing of Nanoscale Vesicles with Single-Molecule Localization Microscopy. J Phys Chem B 2023; 127:2701-2707. [PMID: 36944080 PMCID: PMC10224584 DOI: 10.1021/acs.jpcb.2c09053] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Single-molecule localization microscopy (SMLM) allows super-resolution imaging, mapping, counting, and sizing of biological nanostructures such as cell organelles and extracellular vesicles (EVs), but sizing structures smaller than ∼100 nm can be inaccurate due to single-molecule localization error caused by distortion of the point spread function and limited photon number. Here we demonstrate a method to correct localization error when sizing vesicles and other spherical nanoparticles with SMLM and compare sizing results using two vesicle labeling schemes. We use mean approximation theory to derive a simple equation using full width at half-maximum (FWHM) for correcting particle sizes measured by two-dimensional SMLM, validate the method by sizing streptavidin-coated polystyrene nanobeads with the SMLM technique dSTORM with and without error correction, using transmission electron microscopy (TEM) for comparison, and then apply the method to sizing small seminal EVs. Nanobead sizes measured by dSTORM became increasingly less accurate (larger than TEM values) for beads smaller than 50 nm. The error-correction method reduced the size difference versus TEM from 15% without error correction to 7% with error correction for 40 nm beads, from 44% to 9% for 30 nm beads, and from 66% to 15% for 20 nm beads. Seminal EVs were labeled with a lipophilic membrane dye (MemBright 700) and with an Alexa Fluor 488-anti-CD63 antibody conjugate, and were sized separately using both dyes by dSTORM. Error-corrected exosome diameters were smaller than uncorrected values: 72 nm vs 79 nm mean diameter with membrane dyes; 84 nm vs 97 nm with the antibody-conjugated dyes. The mean error-corrected diameter was 12 nm smaller when using the membrane dye than when using the antibody-conjugated dye likely due to the large size of the antibody. Thus, both the error-correction method and the compact membrane labeling scheme reduce overestimation of vesicle size by SMLM. This error-correction method has a low computational cost as it does not require correction of individual blinking events, and it is compatible with all SMLM techniques (e.g., PALM, STORM, and DNA-PAINT).
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Affiliation(s)
- Seung-Ryoung Jung
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
| | - James Kim
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
| | - Lucia Vojtech
- Departments of Obstetrics and Gynecology,University of Washington, Seattle, WA 98195, USA
| | - Joshua C. Vaughan
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
- Departments of Physiology and Biophysics, University of Washington, Seattle, WA 98195, USA
| | - Daniel T. Chiu
- Department of Chemistry, University of Washington, Seattle, WA 98195, USA
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
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6
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Gornalusse G, Spengler RM, Sandford E, Kim Y, Levy C, Tewari M, Hladik F, Vojtech L. Men who inject opioids exhibit altered tRNA-Gly-GCC isoforms in semen. Mol Hum Reprod 2023; 29:6994192. [PMID: 36661332 PMCID: PMC9976897 DOI: 10.1093/molehr/gaad003] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 12/05/2022] [Indexed: 01/21/2023] Open
Abstract
In addition to their role in protein translation, tRNAs can be cleaved into shorter, biologically active fragments called tRNA fragments (tRFs). Specific tRFs from spermatocytes can propagate metabolic disorders in second generations of mice. Thus, tRFs in germline cells are a mechanism of epigenetic inheritance. It has also been shown that stress and toxins can cause alterations in tRF patterns. We were therefore interested in whether injecting illicit drugs, a major stressor, impacts tRFs in germline cells. We sequenced RNA from spermatocytes and from semen-derived exosomes from people who inject illicit drugs (PWID) and from non-drug using controls, both groups of unknown fertility status. All PWID injected opioids daily, but most also used other illicit drugs. The tRF cleavage products from Gly-GCC tRNA were markedly different between spermatocytes from PWID compared to controls. Over 90% of reads in controls mapped to shorter Gly-GCC tRFs, while in PWID only 45% did. In contrast, only 4.1% of reads in controls mapped to a longer tRFs versus 45.6% in PWID. The long/short tRF ratio was significantly higher in PWID than controls (0.23 versus 0.16, P = 0.0128). We also report differential expression of a group of small nucleolar RNAs (snoRNAs) in semen-derived exosomes, including, among others, ACA14a, U19, and U3-3. Thus, PWID exhibited an altered cleavage pattern of tRNA-Gly-GCC in spermatocytes and an altered cargo of snoRNAs in semen-derived exosomes. Participants were not exclusively using opioids and were not matched with controls in terms of diet, chronic disease, or other stressors, so our finding are not conclusively linked to opioid use. However, all individuals in the PWID group did inject heroin daily. Our study indicates a potential for opioid injection and/or its associated multi-drug use habits and lifestyle changes to influence epigenetic inheritance.
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Affiliation(s)
- Germán Gornalusse
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Ryan M Spengler
- Division of Hematology and Oncology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Erin Sandford
- Division of Hematology and Oncology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Yeseul Kim
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Claire Levy
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Muneesh Tewari
- Division of Hematology and Oncology, Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA.,Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, USA.,Center for Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, USA.,VA Ann Arbor Healthcare System, Ann Arbor, MI, USA
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA.,Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.,Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, WA, USA
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
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7
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Calis P, Vojtech L, Hladik F, Gravett MG. A review of ex vivo placental perfusion models: an underutilized but promising method to study maternal-fetal interactions. J Matern Fetal Neonatal Med 2022; 35:8823-8835. [PMID: 34818981 PMCID: PMC9126998 DOI: 10.1080/14767058.2021.2005565] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 09/10/2021] [Accepted: 11/09/2021] [Indexed: 02/08/2023]
Abstract
Studying the placenta can provide information about the mechanistic pathways of pregnancy disease. However, analyzing placental tissues and manipulating placental function in real-time during pregnancy is not feasible. The ex vivo placental perfusion model allows observing important aspects of the physiology and pathology of the placenta, while maintaining its viability and functional integrity, and without causing harm to mother or fetus. In this review, we describe and compare setups for this technically complex model and summarize outcomes from various published studies. We hope that our review will encourage wider use of ex vivo placental perfusion, which in turn would generate more knowledge to improve pregnancy outcomes.
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Affiliation(s)
- Pinar Calis
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
- Department of Medicine, University of Washington, Seattle, WA, USA
| | - Michael G. Gravett
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
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8
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Mateescu B, Jones JC, Alexander RP, Alsop E, An JY, Asghari M, Boomgarden A, Bouchareychas L, Cayota A, Chang HC, Charest A, Chiu DT, Coffey RJ, Das S, De Hoff P, deMello A, D’Souza-Schorey C, Elashoff D, Eliato KR, Franklin JL, Galas DJ, Gerstein MB, Ghiran IH, Go DB, Gould S, Grogan TR, Higginbotham JN, Hladik F, Huang TJ, Huo X, Hutchins E, Jeppesen DK, Jovanovic-Talisman T, Kim BY, Kim S, Kim KM, Kim Y, Kitchen RR, Knouse V, LaPlante EL, Lebrilla CB, Lee LJ, Lennon KM, Li G, Li F, Li T, Liu T, Liu Z, Maddox AL, McCarthy K, Meechoovet B, Maniya N, Meng Y, Milosavljevic A, Min BH, Morey A, Ng M, Nolan J, De Oliveira Junior GP, Paulaitis ME, Phu TA, Raffai RL, Reátegui E, Roth ME, Routenberg DA, Rozowsky J, Rufo J, Senapati S, Shachar S, Sharma H, Sood AK, Stavrakis S, Stürchler A, Tewari M, Tosar JP, Tucker-Schwartz AK, Turchinovich A, Valkov N, Van Keuren-Jensen K, Vickers KC, Vojtech L, Vreeland WN, Wang C, Wang K, Wang Z, Welsh JA, Witwer KW, Wong DT, Xia J, Xie YH, Yang K, Zaborowski MP, Zhang C, Zhang Q, Zivkovic AM, Laurent LC. Phase 2 of extracellular RNA communication consortium charts next-generation approaches for extracellular RNA research. iScience 2022; 25:104653. [PMID: 35958027 PMCID: PMC9358052 DOI: 10.1016/j.isci.2022.104653] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The extracellular RNA communication consortium (ERCC) is an NIH-funded program aiming to promote the development of new technologies, resources, and knowledge about exRNAs and their carriers. After Phase 1 (2013-2018), Phase 2 of the program (ERCC2, 2019-2023) aims to fill critical gaps in knowledge and technology to enable rigorous and reproducible methods for separation and characterization of both bulk populations of exRNA carriers and single EVs. ERCC2 investigators are also developing new bioinformatic pipelines to promote data integration through the exRNA atlas database. ERCC2 has established several Working Groups (Resource Sharing, Reagent Development, Data Analysis and Coordination, Technology Development, nomenclature, and Scientific Outreach) to promote collaboration between ERCC2 members and the broader scientific community. We expect that ERCC2's current and future achievements will significantly improve our understanding of exRNA biology and the development of accurate and efficient exRNA-based diagnostic, prognostic, and theranostic biomarker assays.
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Affiliation(s)
- Bogdan Mateescu
- Brain Research Institute, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
- Institute for Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland
| | - Jennifer C. Jones
- Laboratory of Pathology Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | | | - Eric Alsop
- Neurogenomics Division, TGen, Phoenix, AZ 85004, USA
| | - Ji Yeong An
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Mohammad Asghari
- Institute for Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland
| | - Alex Boomgarden
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Laura Bouchareychas
- Department of Surgery, Division of Vascular and Endovascular Surgery, University of California, San Francisco, San Francisco, CA 94143, USA
- Northern California Institute for Research and Education, San Francisco, CA 94121, USA
| | - Alfonso Cayota
- Functional Genomics Unit, Institut Pasteur de Montevideo, Montevideo 11400, Uruguay
- University Hospital, Universidad de la República, Montevideo 11600, Uruguay
| | - Hsueh-Chia Chang
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Al Charest
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Daniel T. Chiu
- Department of Chemistry and Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Robert J. Coffey
- Department of Medicine/Gastroenterology and Epithelial Biology Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - Saumya Das
- Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA, USA
| | - Peter De Hoff
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, La Jolla, San Diego, CA 92093, USA
| | - Andrew deMello
- Institute for Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland
| | | | - David Elashoff
- Statistics Core, David Geffen School of Medicine, University of California, Los Angeles, CA, USA
| | - Kiarash R. Eliato
- Department of Molecular Medicine, Beckman Research Institute of the City of Hope Comprehensive Cancer Center, Duarte, CA 91010, USA
| | - Jeffrey L. Franklin
- Department of Medicine/Gastroenterology and Epithelial Biology Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
- Cell and Developmental Biology, Vanderbilt University, Nashville, TN 37235, USA
| | - David J. Galas
- Pacific Northwest Research Institute, Seattle, WA 98122, USA
| | - Mark B. Gerstein
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA
- Program in Computational Biology & Bioinformatics, Yale University, New Haven, CT 06520, USA
- Department of Computer Science, Yale University, New Haven, CT 06520, USA
| | - Ionita H. Ghiran
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - David B. Go
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Stephen Gould
- Department of Biological Chemistry, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA
| | - Tristan R. Grogan
- Department of Medicine Statistics Core, David Geffen School of Medicine at the University of California, Los Angeles, Los Angeles, CA, USA
| | - James N. Higginbotham
- Department of Medicine/Gastroenterology and Epithelial Biology Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Florian Hladik
- Departments of Obstetrics and Gynecology, and Medicine, University of Washington, Seattle, WA, USA
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Tony Jun Huang
- Department of Mechanical Engineering and Material Science, Duke University, Durham, NC 27708, USA
| | - Xiaoye Huo
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | | | - Dennis K. Jeppesen
- Department of Medicine/Gastroenterology and Epithelial Biology Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Tijana Jovanovic-Talisman
- Department of Molecular Medicine, Beckman Research Institute of the City of Hope Comprehensive Cancer Center, Duarte, CA 91010, USA
| | - Betty Y.S. Kim
- Department of Neurosurgery, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
| | - Sung Kim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Kyoung-Mee Kim
- Department of Pathology & Translational Genomics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Yong Kim
- Department of Oral Biology and Medicine, UCLA School of Dentistry, Los Angeles, CA 90095, USA
| | - Robert R. Kitchen
- Corrigan Minehan Heart Center and Cardiology Division, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Vaughan Knouse
- Laboratory of Pathology Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Emily L. LaPlante
- Bioinformatics Research Laboratory, Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | | | - L. James Lee
- Department of Chemical and Biomolecular Engineering and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA
| | - Kathleen M. Lennon
- Department of Molecular Medicine, Beckman Research Institute of the City of Hope Comprehensive Cancer Center, Duarte, CA 91010, USA
| | - Guoping Li
- Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA, USA
| | - Feng Li
- Department of Oral Biology and Medicine, UCLA School of Dentistry, Los Angeles, CA 90095, USA
| | - Tieyi Li
- Department of Materials Science & Engineering, University of California Los Angeles, Los Angeles, CA 90095-1595, USA
| | - Tao Liu
- Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Zirui Liu
- Department of Materials Science & Engineering, University of California Los Angeles, Los Angeles, CA 90095-1595, USA
| | - Adam L. Maddox
- Department of Molecular Medicine, Beckman Research Institute of the City of Hope Comprehensive Cancer Center, Duarte, CA 91010, USA
| | - Kyle McCarthy
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | | | - Nalin Maniya
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Yingchao Meng
- Institute for Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland
| | - Aleksandar Milosavljevic
- Bioinformatics Research Laboratory, Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
- Program in Quantitative and Computational Biosciences Baylor College of Medicine, Houston, TX 77030, USA
| | - Byoung-Hoon Min
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University, School of Medicine, Seoul, South Korea
| | - Amber Morey
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, La Jolla, San Diego, CA 92093, USA
| | - Martin Ng
- Northern California Institute for Research and Education, San Francisco, CA 94121, USA
| | - John Nolan
- Scintillon Institute, San Diego, CA, USA
| | | | - Michael E. Paulaitis
- Center for Nanomedicine at the Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Tuan Anh Phu
- Northern California Institute for Research and Education, San Francisco, CA 94121, USA
| | - Robert L. Raffai
- Department of Surgery, Division of Vascular and Endovascular Surgery, University of California, San Francisco, San Francisco, CA 94143, USA
- Northern California Institute for Research and Education, San Francisco, CA 94121, USA
- Department of Veterans Affairs, Surgical Service (112G), San Francisco VA Medical Center, San Francisco, CA 94121, USA
| | - Eduardo Reátegui
- Department of Chemical and Biomolecular Engineering and Comprehensive Cancer Center, The Ohio State University, Columbus, OH 43210, USA
| | - Matthew E. Roth
- Bioinformatics Research Laboratory, Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA
| | | | - Joel Rozowsky
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520, USA
| | - Joseph Rufo
- Department of Mechanical Engineering and Material Science, Duke University, Durham, NC 27708, USA
| | - Satyajyoti Senapati
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Sigal Shachar
- Meso Scale Diagnostics, LLC, Rockville, MD 20850, USA
| | - Himani Sharma
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Anil K. Sood
- Department of Gynecologic Oncology & Reproductive Medicine, University of Texas MD Aderson Cancer Center, Houston, TX 77030, USA
| | - Stavros Stavrakis
- Institute for Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland
| | - Alessandra Stürchler
- Brain Research Institute, University of Zürich, Winterthurerstrasse 190, CH-8057 Zürich, Switzerland
- Institute for Chemical and Bioengineering, ETH Zürich, Vladimir Prelog Weg 1, 8093 Zürich, Switzerland
| | - Muneesh Tewari
- Department of Internal Medicine, Hematology/Oncology Division, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
- Center for Computational Medicine and Bioinformatics, University of Michigan, Ann Arbor, MI, USA
- Rogel Comprehensive Cancer Center, University of Michigan, Ann Arbor, MI 48109, USA
| | - Juan P. Tosar
- Functional Genomics Unit, Institut Pasteur de Montevideo, Montevideo 11400, Uruguay
- Analytical Biochemistry Unit, School of Science, Universidad de la República, Montevideo 11400, Uruguay
| | | | - Andrey Turchinovich
- Cancer Genome Research (B063), German Cancer Research Center DKFZ, Heidelberg 69120, Germany
- Heidelberg Biolabs GmbH, Heidelberg 69120, Germany
| | - Nedyalka Valkov
- Cardiovascular Research Center, Massachusetts General Hospital, Boston, MA, USA
| | | | - Kasey C. Vickers
- Department of Medicine, Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA 98195, USA
| | - Wyatt N. Vreeland
- Bioprocess Measurement Group, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Ceming Wang
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Kai Wang
- Institute for Systems Biology, Seattle, WA 98109, USA
| | - ZeYu Wang
- Department of Mechanical Engineering and Material Science, Duke University, Durham, NC 27708, USA
| | - Joshua A. Welsh
- Laboratory of Pathology Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Kenneth W. Witwer
- Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - David T.W. Wong
- Department of Oral Biology and Medicine, UCLA School of Dentistry, Los Angeles, CA 90095, USA
| | - Jianping Xia
- Department of Mechanical Engineering and Material Science, Duke University, Durham, NC 27708, USA
| | - Ya-Hong Xie
- Department of Materials Science & Engineering, University of California Los Angeles, Los Angeles, CA 90095-1595, USA
| | - Kaichun Yang
- Department of Mechanical Engineering and Material Science, Duke University, Durham, NC 27708, USA
| | - Mikołaj P. Zaborowski
- Department of Gynecology, Obstetrics and Gynecologic Oncology, Division of Gynecologic Oncology, Poznan University of Medical Sciences, 60-535 Poznań, Poland
| | - Chenguang Zhang
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
| | - Qin Zhang
- Department of Medicine/Gastroenterology and Epithelial Biology Center, Vanderbilt University Medical Center, Nashville, TN 37232, USA
| | | | - Louise C. Laurent
- Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California, La Jolla, San Diego, CA 92093, USA
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9
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Gornalusse GG, Zhang M, Wang R, Rwigamba E, Kirby AC, Fialkow M, Nance E, Hladik F, Vojtech L. HSV-2 Infection Enhances Zika Virus Infection of Primary Genital Epithelial Cells Independently of the Known Zika Virus Receptor AXL. Front Microbiol 2022; 12:825049. [PMID: 35126336 PMCID: PMC8811125 DOI: 10.3389/fmicb.2021.825049] [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] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 12/31/2021] [Indexed: 01/05/2023] Open
Abstract
Zika virus (ZIKV) is transmitted to people by bite of an infected mosquito and by sexual contact. ZIKV infects primary genital epithelial cells, the same cells targeted by herpes simplex virus 2 (HSV-2). HSV-2 seroprevalence is high in areas where ZIKV is endemic, but it is unknown whether HSV-2 increases the risk for ZIKV infection. Here, we found that pre-infecting female genital tract epithelial cells with HSV-2 leads to enhanced binding of ZIKV virions. This effect did not require active replication by HSV-2, implying that the effect results from the immune response to HSV-2 exposure or to viral genes expressed early in the HSV-2 lifecycle. Treating cells with toll-like receptor-3 ligand poly-I:C also lead to enhanced binding by ZIKV, which was inhibited by the JAK-STAT pathway inhibitor ruxolitinib. Blocking or knocking down the well-studied ZIKV receptor AXL did not prevent binding of ZIKV to epithelial cells, nor prevent enhanced binding in the presence of HSV-2 infection. Blocking the α5 integrin receptor did not prevent ZIKV binding to cells either. Overall, our results indicate that ZIKV binding to genital epithelial cells is not mediated entirely by a canonical receptor, but likely occurs through redundant pathways that may involve lectin receptors and glycosaminoglycans. Our studies may pave the way to new interventions that interrupt the synergism between herpes and Zika viruses.
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Affiliation(s)
- Germán G. Gornalusse
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, United States
| | - Mengying Zhang
- Molecular Engineering and Sciences Institute, University of Washington, Seattle, WA, United States
| | - Ruofan Wang
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, United States
| | - Emery Rwigamba
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, United States
| | - Anna C. Kirby
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, United States
| | - Michael Fialkow
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, United States
| | - Elizabeth Nance
- Molecular Engineering and Sciences Institute, University of Washington, Seattle, WA, United States
- Department of Chemical Engineering, University of Washington, Seattle, WA, United States
| | - Florian Hladik
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, United States
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States
- Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, WA, United States
| | - Lucia Vojtech
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, United States
- *Correspondence: Lucia Vojtech,
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10
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Khosropour CM, Dombrowski JC, Vojtech L, Patton DL, Campbell LA, Barbee LA, Franzi MC, Hybiske K. Rectal Chlamydia trachomatis Infection: A Narrative Review of the State of the Science and Research Priorities. Sex Transm Dis 2021; 48:e223-e227. [PMID: 34475361 PMCID: PMC8595876 DOI: 10.1097/olq.0000000000001549] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
ABSTRACT Chlamydia trachomatis (CT) is the most commonly reported infection in the United States. Most chlamydial research to date has focused on urogenital infection, but a growing body of research has demonstrated that rectal chlamydia is a relatively common infection among clinic-attending men and women. We know that most rectal CT infections are asymptomatic, but the health implications of these infections, particularly for women, are unclear. In addition, there are key knowledge gaps related to the epidemiologic parameters of rectal chlamydia, the routes of acquisition, the duration of infection, and the clinical significance of a positive rectal CT test result. This lack of information has led to a blind spot in the potential role of rectal chlamydia in sustaining high levels of CT transmission in the United States. Furthermore, recent findings from animal models suggest that the immune response generated from gastrointestinal chlamydial infection can protect against urogenital infection; however, it remains to be determined whether rectal chlamydia similarly modulates anti-CT immunity in humans. This is a critical question in the context of ongoing efforts to develop a CT vaccine. In this narrative review, we summarize the state of the science for rectal chlamydia and discuss the key outstanding questions and research priorities in this neglected area of sexual health research.
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Affiliation(s)
| | - Julia C. Dombrowski
- Department of Epidemiology, University of Washington, Seattle, WA, USA
- Department of Medicine, University of Washington, Seattle, WA, USA
- Public Health – Seattle and King County HIV/STD Program, Seattle, WA, USA
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Dorothy L. Patton
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Lee Ann Campbell
- Department of Global Health, University of Washington, Seattle, WA, USA
| | - Lindley A. Barbee
- Department of Medicine, University of Washington, Seattle, WA, USA
- Public Health – Seattle and King County HIV/STD Program, Seattle, WA, USA
| | | | - Kevin Hybiske
- Department of Medicine, University of Washington, Seattle, WA, USA
- Department of Global Health, University of Washington, Seattle, WA, USA
- Department of Microbiology, University of Washington, Seattle, WA, USA
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11
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Wang R, Gornalusse GG, Kim Y, Pandey U, Hladik F, Vojtech L. Corrigendum: Potent Restriction of Sexual Zika Virus Infection by the Lipid Fraction of Extracellular Vesicles in Semen. Front Microbiol 2021; 12:707875. [PMID: 34211453 PMCID: PMC8240464 DOI: 10.3389/fmicb.2021.707875] [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] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 05/19/2021] [Indexed: 11/13/2022] Open
Abstract
[This corrects the article DOI: 10.3389/fmicb.2020.574054.].
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Affiliation(s)
- Ruofan Wang
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Germán G. Gornalusse
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Yeseul Kim
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Urvashi Pandey
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
- Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, WA, United States
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
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12
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Jiang Y, Andronico LA, Jung SR, Chen H, Fujimoto B, Vojtech L, Chiu DT. High-Throughput Counting and Superresolution Mapping of Tetraspanins on Exosomes Using a Single-Molecule Sensitive Flow Technique and Transistor-like Semiconducting Polymer Dots. Angew Chem Int Ed Engl 2021; 60:13470-13475. [PMID: 33797851 PMCID: PMC8215978 DOI: 10.1002/anie.202103282] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 03/31/2021] [Indexed: 12/22/2022]
Abstract
A method for high-throughput counting and superresolution mapping of surface proteins on exosomes is described. The method combines a single-molecule sensitive flow technique and an adaptive superresolution imaging method. Exosomes stained with membrane dye and dye-conjugated antibodies were analyzed using a microfluidic platform at a flow rate of 100 exosome s-1 to determine size and protein copy number. Superresolution mapping was performed with exosomes labeled with novel transistor-like, semiconducting polymer dots (Pdots), which exhibit spontaneous blinking with <5 nm localization error and a broad range of optical-adjustable duty cycles. Based on the copy numbers extracted from the flow analysis, the switch-on frequency of the Pdots were finely adjusted so that structures of hundreds of exosomes were obtained within five minutes. The high throughput and high sensitivity of this method offer clear advantages for characterization of exosomes and similar biological vesicles.
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Affiliation(s)
- Yifei Jiang
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington, 98195, USA
| | - Luca A Andronico
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington, 98195, USA
| | - Seung-Ryoung Jung
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington, 98195, USA
| | - Haobin Chen
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington, 98195, USA
| | - Bryant Fujimoto
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington, 98195, USA
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, 98195, USA
| | - Daniel T Chiu
- Department of Chemistry and Bioengineering, University of Washington, Seattle, Washington, 98195, USA
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13
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Jiang Y, Andronico LA, Jung S, Chen H, Fujimoto B, Vojtech L, Chiu DT. High‐Throughput Counting and Superresolution Mapping of Tetraspanins on Exosomes Using a Single‐Molecule Sensitive Flow Technique and Transistor‐like Semiconducting Polymer Dots. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103282] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Yifei Jiang
- Department of Chemistry and Bioengineering University of Washington Seattle Washington 98195 USA
| | - Luca A. Andronico
- Department of Chemistry and Bioengineering University of Washington Seattle Washington 98195 USA
| | - Seung‐Ryoung Jung
- Department of Chemistry and Bioengineering University of Washington Seattle Washington 98195 USA
| | - Haobin Chen
- Department of Chemistry and Bioengineering University of Washington Seattle Washington 98195 USA
| | - Bryant Fujimoto
- Department of Chemistry and Bioengineering University of Washington Seattle Washington 98195 USA
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology University of Washington Seattle Washington 98195 USA
| | - Daniel T. Chiu
- Department of Chemistry and Bioengineering University of Washington Seattle Washington 98195 USA
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14
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Andronico LA, Jiang Y, Jung SR, Fujimoto BS, Vojtech L, Chiu DT. Sizing Extracellular Vesicles Using Membrane Dyes and a Single Molecule-Sensitive Flow Analyzer. Anal Chem 2021; 93:5897-5905. [PMID: 33784071 DOI: 10.1021/acs.analchem.1c00253] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Extracellular vesicles (EVs) are membranous particles released by most cells in our body, which are involved in many cell-to-cell signaling processes. Given the nanometer sizes and heterogeneity of EVs, highly sensitive methods with single-molecule resolution are fundamental to investigating their biophysical properties. Here, we demonstrate the sizing of EVs using a fluorescence-based flow analyzer with single-molecule sensitivity. Using a dye that selectively partitions into the vesicle's membrane, we show that the fluorescence intensity of a vesicle is proportional to its diameter. We discuss the constraints in sample preparation which are inherent to sizing nanoscale vesicles with a fluorescent membrane dye and propose several guidelines to improve data consistency. After optimizing staining conditions, we were able to measure the size of vesicles in the range ∼35-300 nm, covering the spectrum of EV sizes. Lastly, we developed a method to correct the signal intensity from each vesicle based on its traveling speed inside the microfluidic channel, by operating at a high sampling rate (10 kHz) and measuring the time required for the particle to cross the laser beam. Using this correction, we obtained a threefold greater accuracy in EV sizing, with a precision of ±15-25%.
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Affiliation(s)
- Luca A Andronico
- Department of Chemistry, University of Washington, Seattle 98195, Washington, United States
| | - Yifei Jiang
- Department of Chemistry, University of Washington, Seattle 98195, Washington, United States
| | - Seung-Ryoung Jung
- Department of Chemistry, University of Washington, Seattle 98195, Washington, United States
| | - Bryant S Fujimoto
- Department of Chemistry, University of Washington, Seattle 98195, Washington, United States
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle 98195, Washington, United States
| | - Daniel T Chiu
- Department of Chemistry, University of Washington, Seattle 98195, Washington, United States
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15
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Xu S, Wu L, Qin Y, Jiang Y, Sun K, Holcomb C, Gravett MG, Vojtech L, Schiro PG, Chiu DT. Sequential Ensemble-Decision Aliquot Ranking Isolation and Fluorescence In Situ Hybridization Identification of Rare Cells from Blood by Using Concentrated Peripheral Blood Mononuclear Cells. Anal Chem 2021; 93:3196-3201. [PMID: 33528996 PMCID: PMC9901914 DOI: 10.1021/acs.analchem.0c04629] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Isolation and analysis of circulating rare cells is a promising approach for early detection of cancer and other diseases and for prenatal diagnosis. Isolation of rare cells is usually difficult due to their heterogeneity as well as their low abundance in peripheral blood. We previously reported a two-stage ensemble-decision aliquot ranking platform (S-eDAR) for isolating circulating tumor cells from whole blood with high throughput, high recovery rate (>90%), and good purity (>70%), allowing detection of low surface antigen-expressing cancer cells linked to metastasis. However, due to the scarcity of these cells, large sample volumes and large quantities of antibodies were required to isolate sufficient cells for downstream analysis. Here, we drastically increased the number of nucleated cells analyzed by first concentrating peripheral blood mononuclear cells (PBMCs) from whole blood by density gradient centrifugation. The S-eDAR platform was capable of isolating rare cells from concentrated PBMCs (108/mL, equivalent to processing ∼20 mL of whole blood in the 1 mL sample volume used by our instrument) at a high recovery rate (>85%). We then applied the S-eDAR platform for isolating rare fetal nucleated red blood cells (fNRBCs) from concentrated PBMCs spiked with umbilical cord blood cells and confirmed fNRBC recovery by immunostaining and fluorescence in situ hybridization, demonstrating the potential of the S-eDAR system for isolating rare fetal cells from maternal PBMCs to improve noninvasive prenatal diagnosis.
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Affiliation(s)
- Shihan Xu
- Department of Bioengineering, University of Washington, Seattle, WA, USA,Department of Chemistry, University of Washington, Seattle, WA, USA
| | - Li Wu
- Department of Chemistry, University of Washington, Seattle, WA, USA,School of Public Health, Nantong University, Nantong, Jiangsu, P. R. China
| | - Yuling Qin
- Department of Chemistry, University of Washington, Seattle, WA, USA,School of Public Health, Nantong University, Nantong, Jiangsu, P. R. China
| | - Yifei Jiang
- Department of Chemistry, University of Washington, Seattle, WA, USA
| | - Kai Sun
- Department of Chemistry, University of Washington, Seattle, WA, USA
| | - Chenee Holcomb
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, USA
| | - Michael G. Gravett
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, USA
| | - Lucia Vojtech
- Department of Obstetrics & Gynecology, University of Washington, Seattle, WA, USA
| | | | - Daniel T. Chiu
- Department of Bioengineering, University of Washington, Seattle, WA, USA,Department of Chemistry, University of Washington, Seattle, WA, USA
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16
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Wang R, Gornalusse GG, Kim Y, Pandey U, Hladik F, Vojtech L. Potent Restriction of Sexual Zika Virus Infection by the Lipid Fraction of Extracellular Vesicles in Semen. Front Microbiol 2020; 11:574054. [PMID: 33133043 PMCID: PMC7550675 DOI: 10.3389/fmicb.2020.574054] [Citation(s) in RCA: 8] [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: 06/23/2020] [Accepted: 09/07/2020] [Indexed: 12/31/2022] Open
Abstract
Sexual Zika virus (ZIKV) transmission from men to women occurs less frequently than the often-detected high viral loads in semen would suggest, but worries that this transmission route predisposes to fetal damage in pregnant women remain. To better understand sexual ZIKV pathogenesis, we studied the permissiveness of the human female genital tract to infection and the effect of semen on this process. ZIKV replicates in vaginal tissues and primary epithelial cells from the vagina, ectocervix, and endocervix and induces an innate immune response, but also continues to replicate without cytopathic effect. Infection of genital cells and tissues is strongly inhibited by extracellular vesicles (EV) in semen at physiological vesicle-to-virus ratios. Liposomes with the same composition as semen EVs also impair infection, indicating that the EV’s lipid fraction, rather than their protein or RNA cargo, is responsible for this anti-viral effect. Thus, EVs in semen potently restrict ZIKV transmission, but the virus propagates well once infection in the recipient mucosa has been established.
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Affiliation(s)
- Ruofan Wang
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Germán G Gornalusse
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Yeseul Kim
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Urvashi Pandey
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States.,Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, WA, United States.,Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, United States
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, United States
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17
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Hughes SM, Levy CN, Calienes FL, Stekler JD, Pandey U, Vojtech L, Berard AR, Birse K, Noël-Romas L, Richardson B, Golden JB, Cartwright M, Collier AC, Stevens CE, Curlin ME, Holtz TH, Mugo N, Irungu E, Katabira E, Muwonge T, Lama JR, Baeten JM, Burgener A, Lingappa JR, McElrath MJ, Mackelprang R, McGowan I, Cranston RD, Cameron MJ, Hladik F. Treatment with Commonly Used Antiretroviral Drugs Induces a Type I/III Interferon Signature in the Gut in the Absence of HIV Infection. Cell Rep Med 2020; 1:100096. [PMID: 33015651 PMCID: PMC7511692 DOI: 10.1016/j.xcrm.2020.100096] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 07/09/2020] [Accepted: 08/24/2020] [Indexed: 12/18/2022]
Abstract
Tenofovir disoproxil fumarate (TDF) and emtricitabine (FTC) are used for HIV treatment and prevention. Previously, we found that topical rectal tenofovir gel caused immunological changes in the mucosa. Here, we assess the effect of oral TDF/FTC in three HIV pre-exposure prophylaxis trials, two with gastrointestinal and one with cervicovaginal biopsies. TDF/FTC induces type I/III interferon-related (IFN I/III) genes in the gastrointestinal tract, but not blood, with strong correlations between the two independent rectal biopsy groups (Spearman r = 0.91) and between the rectum and duodenum (r = 0.81). Gene set testing also indicates stimulation of the type I/III pathways in the ectocervix and of cellular proliferation in the duodenum. mRNA sequencing, digital droplet PCR, proteomics, and immunofluorescence confirm IFN I/III pathway stimulation in the gastrointestinal tract. Thus, oral TDF/FTC stimulates an IFN I/III signature throughout the gut, which could increase antiviral efficacy but also cause chronic immune activation in HIV prevention and treatment settings. Tenofovir (TDF) and emtricitabine (FTC) are used for HIV treatment and prevention TDF/FTC induce a type I/III interferon-associated signature throughout the gut IFN I/III induction is confirmed in independent clinical cohorts and 5 assay types IFN I/III induction may contribute to anti-HIV efficacy and chronic immune activation
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Affiliation(s)
- Sean M Hughes
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Claire N Levy
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Fernanda L Calienes
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Joanne D Stekler
- Department of Epidemiology, University of Washington, Seattle, WA, USA.,Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA.,Department of Global Health, University of Washington, Seattle, WA, USA
| | - Urvashi Pandey
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA
| | - Alicia R Berard
- Departments of Obstetrics & Gynecology and Medical Microbiology, University of Manitoba, Winnipeg, MB, Canada
| | - Kenzie Birse
- Departments of Obstetrics & Gynecology and Medical Microbiology, University of Manitoba, Winnipeg, MB, Canada.,Center for Global Health and Diseases, Case Western Reserve University, Cleveland, OH, USA
| | - Laura Noël-Romas
- Departments of Obstetrics & Gynecology and Medical Microbiology, University of Manitoba, Winnipeg, MB, Canada.,Center for Global Health and Diseases, Case Western Reserve University, Cleveland, OH, USA
| | - Brian Richardson
- Department of Population and Quantitative Health Sciences, Case Western Reserve University, Cleveland, OH, USA
| | - Jackelyn B Golden
- Department of Population and Quantitative Health Sciences, Case Western Reserve University, Cleveland, OH, USA
| | - Michael Cartwright
- Department of Population and Quantitative Health Sciences, Case Western Reserve University, Cleveland, OH, USA
| | - Ann C Collier
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | - Claire E Stevens
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
| | - Marcel E Curlin
- Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA.,Thailand Ministry of Public Health-US Centers for Disease Control and Prevention Collaboration, Nonthaburi, Thailand.,Department of Medicine, Division of Infectious Diseases, Oregon Health and Sciences University, Portland, OR, USA
| | - Timothy H Holtz
- Division of HIV/AIDS Prevention, Centers for Disease Control and Prevention, Atlanta, GA, USA.,Thailand Ministry of Public Health-US Centers for Disease Control and Prevention Collaboration, Nonthaburi, Thailand
| | - Nelly Mugo
- Partners in Health Research and Development, Kenya Medical Research Institute, Thika, Kenya.,Center for Clinical Research (CCR), Kenya Medical Research Institute (KEMRI), Nairobi, Kenya.,Department of Global Health, University of Washington, Seattle, WA, USA
| | - Elizabeth Irungu
- Partners in Health Research and Development, Kenya Medical Research Institute, Thika, Kenya
| | - Elly Katabira
- Infectious Disease Institute, Makerere University, Kampala, Uganda
| | - Timothy Muwonge
- Infectious Disease Institute, Makerere University, Kampala, Uganda
| | - Javier R Lama
- Asociación Civil Impacta Salud y Educación, Lima, Peru
| | - Jared M Baeten
- Department of Epidemiology, University of Washington, Seattle, WA, USA.,Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA.,Department of Global Health, University of Washington, Seattle, WA, USA
| | - Adam Burgener
- Center for Global Health and Diseases, Case Western Reserve University, Cleveland, OH, USA.,Departments of Obstetrics & Gynecology and Medical Microbiology, University of Manitoba, Winnipeg, MB, Canada.,Unit of Infectious Diseases, Department of Medicine Solna, Centre for Molecular Medicine, Karolinska Institute, Karolinska University Hospital, Stockholm, Sweden
| | - Jairam R Lingappa
- Department of Pediatrics, University of Washington, Seattle, WA, USA.,Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA.,Department of Global Health, University of Washington, Seattle, WA, USA
| | - M Juliana McElrath
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.,Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA.,Department of Laboratory Medicine, University of Washington, Seattle, WA, USA.,Department of Global Health, University of Washington, Seattle, WA, USA
| | - Romel Mackelprang
- Department of Global Health, University of Washington, Seattle, WA, USA
| | - Ian McGowan
- Orion Biotechnology, Ottawa, ON, Canada.,Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Ross D Cranston
- Department of Infectious Diseases and Dermatology, University of Barcelona, Barcelona, Spain
| | - Mark J Cameron
- Department of Population and Quantitative Health Sciences, Case Western Reserve University, Cleveland, OH, USA
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, WA, USA.,Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA.,Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
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18
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Abstract
Extracellular vesicles (EVs) are important mediators of intercellular communication. Their role in disease processes, uncovered mostly over the last two decades, makes them potential biomarkers, leading to a need to fundamentally understand EV biology. Direct visualization of EVs can provide insights into EV behavior, but current labeling techniques are often restricted by false-positive signals and rapid photobleaching. Hence, we developed a method of labeling EVs through conjugation with quantum dots (QDs)-high photoluminescent nanosized semi-conductors-using click chemistry. We showed that QD-EV conjugation could be tailored by altering QD to EV ratio or by using a catalyst. This conjugation chemistry was stable in a biological environment and upon storage for up to a week. Using size-exclusion chromatography, QD-EV conjugates could be separated from unconjugated QDs, enabling EV-specific signal detection. We demonstrate that these QD-EV conjugates can be live- and fixed-imaged in high resolution on cells and in tissue sheets, and the conjugates have better photostability compared with the commonly used EV dye DiI. We labeled two distinct EV populations: human semen EVs (sEVs) from fresh semen samples donated by healthy volunteers and brain EVs (bEVs) from excised rat brain tissues. We visualized QD-sEVs in epithelial sheets isolated from human vaginal mucosa and time-lapse imaged QD-bEV interactions with microglial BV-2 cells. The development of the QD-EV conjugate will benefit the study of EV localization, movement, and function and accelerate their potential use as biomarkers, therapeutic agents, or drug-delivery vehicles.
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Affiliation(s)
- Mengying Zhang
- Molecular Engineering and Sciences Institute, University of Washington, Seattle, Washington 98195-1652, United States
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington 98195-6460, United States
| | - Ziming Ye
- Department of Chemical Engineering, University of Washington, Seattle, Washington 98195-1750, United States
| | - Florian Hladik
- Department of Obstetrics and Gynecology and Department of Medicine, Division of Allergy and Infectious Diseases, University of Washington, Seattle, Washington 98195-6460, United States
| | - Elizabeth Nance
- Molecular Engineering and Sciences Institute, Department of Chemical Engineering, Center on Human Development and Disability, and Department of Radiology, University of Washington, Seattle, Washington 98195-1652, United States
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19
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Stamatikos A, Knight E, Vojtech L, Bi L, Wacker BK, Tang C, Dichek DA. Exosome-Mediated Transfer of Anti-miR-33a-5p from Transduced Endothelial Cells Enhances Macrophage and Vascular Smooth Muscle Cell Cholesterol Efflux. Hum Gene Ther 2020; 31:219-232. [PMID: 31842627 DOI: 10.1089/hum.2019.245] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Atherosclerosis is a disease of large- and medium-sized arteries that is caused by cholesterol accumulation in arterial intimal cells, including macrophages and smooth muscle cells (SMC). Cholesterol accumulation in these cells can be prevented or reversed in preclinical models-and atherosclerosis reduced-by transgenesis that increases expression of molecules that control cholesterol efflux, including apolipoprotein AI (apoAI) and ATP-binding cassette subfamily A, member 1 (ABCA1). In a previous work, we showed that transduction of arterial endothelial cells (EC)-with a helper-dependent adenovirus (HDAd) expressing apoAI-enhanced EC cholesterol efflux in vitro and decreased atherosclerosis in vivo. Similarly, overexpression of ABCA1 in cultured EC increased cholesterol efflux and decreased inflammatory gene expression. These EC-targeted gene-therapy strategies might be improved by concurrent upregulation of cholesterol-efflux pathways in other intimal cell types. Here, we report modification of this strategy to enable delivery of therapeutic nucleic acids to cells of the sub-endothelium. We constructed an HDAd (HDAdXMoAntimiR33a5p) that expresses an antagomiR directed at miR-33a-5p (a microRNA that suppresses cholesterol efflux by silencing ABCA1). HDAdXMoAntimiR33a5p contains a sequence motif that enhances uptake of anti-miR-33a-5p into exosomes. Cultured EC release exosomes containing small RNA, including miR-33a-5p. After transduction with HDAdXMoAntimiR33a5p, EC-derived exosomes containing anti-miR-33a-5p accumulate in conditioned medium (CM). When this CM is added to macrophages or SMC, anti-miR-33a-5p is detected in these target cells. Exosome-mediated transfer of anti-miR-33a-5p reduces miR-33a-5p by ∼65-80%, increases ABCA1 protein by 1.6-2.2-fold, and increases apoAI-mediated cholesterol efflux by 1.4-1.6-fold (all p ≤ 0.01). These effects were absent in macrophages and SMC incubated in exosome-depleted CM. EC transduced with HDAdXMoAntimiR33a5p release exosomes that can transfer anti-miR-33a-5p to other intimal cell types, upregulating cholesterol efflux from these cells. This strategy provides a platform for genetic modification of intimal and medial cells, using a vector that transduces only EC.
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Affiliation(s)
- Alexis Stamatikos
- Department of Medicine, University of Washington, Seattle, Washington
| | - Ethan Knight
- Department of Medicine, University of Washington, Seattle, Washington
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington
| | - Lianxiang Bi
- Department of Medicine, University of Washington, Seattle, Washington
| | - Bradley K Wacker
- Department of Medicine, University of Washington, Seattle, Washington
| | - Chongren Tang
- Department of Medicine, University of Washington, Seattle, Washington
| | - David A Dichek
- Department of Medicine, University of Washington, Seattle, Washington
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20
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Vojtech L, Zhang M, Davé V, Levy C, Hughes SM, Wang R, Calienes F, Prlic M, Nance E, Hladik F. Extracellular vesicles in human semen modulate antigen-presenting cell function and decrease downstream antiviral T cell responses. PLoS One 2019; 14:e0223901. [PMID: 31622420 PMCID: PMC6797208 DOI: 10.1371/journal.pone.0223901] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [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: 06/12/2019] [Accepted: 10/01/2019] [Indexed: 02/06/2023] Open
Abstract
Human semen contains trillions of extracellular vesicles (SEV) similar in size to sexually transmitted viruses and loaded with potentially bioactive miRNAs, proteins and lipids. SEV were shown to inhibit HIV and Zika virus infectivity, but whether SEV are able also to affect subsequent immune responses is unknown. We found that SEV efficiently bound to and entered antigen-presenting cells (APC) and thus we set out to further dissect the impact of SEV on APC function and the impact on downstream T cell responses. In an APC–T cell co-culture system, SEV exposure to APC alone markedly reduced antigen-specific cytokine production, degranulation and cytotoxicity by antigen-specific memory CD8+ T cells. In contrast, inhibition of CD4+ T cell responses required both APC and T cell exposure to SEV. Surprisingly, SEV did not alter MHC or co-stimulatory receptor expression on APCs, but caused APCs to upregulate indoleamine 2,3 deoxygenase, an enzyme known to indirectly inhibit T cells. Thus, SEV reduce the ability of APCs to activate T cells. We propose here that these immune-inhibitory properties of SEV may be intended to prevent immune responses against semen-derived antigens, but can be hi-jacked by genitally acquired viral infections to compromise adaptive cellular immunity.
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Affiliation(s)
- Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
- * E-mail: (LV); (FH)
| | - Mengying Zhang
- Molecular Engineering and Sciences Institute, University of Washington, Seattle, Washington, United States of America
| | - Veronica Davé
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Global Health, University of Washington, Seattle, Washington, United States of America
| | - Claire Levy
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Sean M. Hughes
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Ruofan Wang
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Fernanda Calienes
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Martin Prlic
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Global Health, University of Washington, Seattle, Washington, United States of America
- Department of Immunology, University of Washington, Seattle, Washington, United States of America
| | - Elizabeth Nance
- Molecular Engineering and Sciences Institute, University of Washington, Seattle, Washington, United States of America
- Department of Chemical Engineering, University of Washington, Seattle, Washington, United States of America
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Medicine, Division of Allergy and Infectious Diseases, University of Washington, Seattle, Washington, United States of America
- * E-mail: (LV); (FH)
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21
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Stamatikos A, Vojtech L, Knight E, Bi L, Wacker B, Tang C, Dichek D. Abstract 884: Expression of Anti-mir-33a-5p in Cultured Endothelial Cells Increases Macrophage and Smooth Muscle Cell Cholesterol Efflux by Exosome-mediated Transfer of Anti-mir-33a-5p. Circ Res 2019. [DOI: 10.1161/res.125.suppl_1.884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
The microRNA miR-33a-5p impairs apoAI-mediated cholesterol efflux by silencing ABCA1 expression. Systemic injection of antagomirs to miR-33a-5p reduces atherosclerosis but can cause hepatic steatosis and hypertriglyceridemia. In contrast, local delivery of miR-33a-5p antagomirs to lipid-laden intimal cells [smooth muscle cells (SMC) and macrophages (Mϕ)] could potentially treat atherosclerosis without causing metabolic abnormalities. Helper-dependent adenoviral vectors (HDAd) provide durable transgene expression in endothelial cells (EC) in vivo; however, HDAd does not cross an intact large vessel EC layer and therefore cannot deliver antagomirs directly to SMC and Mϕ. We hypothesized that transducing EC with an HDAd expressing anti-miR-33a-5p (HDAdAnti) could result in packaging of anti-miR-33a-5p into EC-derived exosomes that, in turn, deliver anti-miR-33a-5p to neighboring SMC and Mϕ. Inhibition of miR-33a-5p in SMC and Mϕ would upregulate ABCA1, and enhance apoAI-mediated cholesterol efflux.
Methods:
We transduced cultured EC with either HDAdAnti or a control HDAd expressing a “scrambled” shRNA (HDAdScr), harvested conditioned medium (CM) from the EC, and treated SMC and Mϕ (some of which were cholesterol-loaded) with the CM. We measured levels of anti-miR-33a-5p and miR-33a-5p, ABCA1 protein, and apoAI-mediated cholesterol efflux in the treated SMC and Mϕ.
Results:
Exosomes containing anti-miR-33a-5p were present only in CM from HDAdAnti-transduced EC. Compared to Mϕ incubated with CM from EC transduced with HDAdScr, Mϕ incubated with CM from HDAdAnti-transduced EC had 80% lower levels of miR-33a-5p, a 2.2-fold increase in ABCA1 protein, and a 1.6-fold increase in apoAI-mediated cholesterol efflux (all P<0.001). Similar results were obtained with SMC: 65% lower levels of miR-33a-5p expression, 1.6-fold increase in ABCA1 protein, and 1.4-fold increase in apoAI-mediated cholesterol efflux (all P≤0.01).
Conclusions:
EC transduced with HDAdAnti release exosomes containing anti-miR-33a-5p. These exosomes transfer anti-miR-33a-5p to SMC and Mϕ, increasing cholesterol efflux. Application of this approach in vivo may accelerate vessel wall cholesterol efflux, preventing and reversing atherosclerosis.
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22
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Fink SL, Vojtech L, Wagoner J, Slivinski NSJ, Jackson KJ, Wang R, Khadka S, Luthra P, Basler CF, Polyak SJ. The Antiviral Drug Arbidol Inhibits Zika Virus. Sci Rep 2018; 8:8989. [PMID: 29895962 PMCID: PMC5997637 DOI: 10.1038/s41598-018-27224-4] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Accepted: 05/25/2018] [Indexed: 12/27/2022] Open
Abstract
There are many emerging and re-emerging globally prevalent viruses for which there are no licensed vaccines or antiviral medicines. Arbidol (ARB, umifenovir), used clinically for decades in several countries as an anti-influenza virus drug, inhibits many other viruses. In the current study, we show that ARB inhibits six different isolates of Zika virus (ZIKV), including African and Asian lineage viruses in multiple cell lines and primary human vaginal and cervical epithelial cells. ARB protects against ZIKV-induced cytopathic effects. Time of addition studies indicate that ARB is most effective at suppressing ZIKV when added to cells prior to infection. Moreover, ARB inhibits pseudoviruses expressing the ZIKV Envelope glycoprotein. Thus, ARB, a broadly acting anti-viral agent with a well-established safety profile, inhibits ZIKV, likely by blocking viral entry.
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Affiliation(s)
- Susan L Fink
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, USA
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, USA
| | - Jessica Wagoner
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, USA
| | - Natalie S J Slivinski
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, USA
| | - Konner J Jackson
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, USA
| | - Ruofan Wang
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, USA
| | - Sudip Khadka
- Center for Microbial Pathogenesis, Institute for Biomedical Sciences, Georgia State University, Atlanta, USA
| | - Priya Luthra
- Center for Microbial Pathogenesis, Institute for Biomedical Sciences, Georgia State University, Atlanta, USA
| | - Christopher F Basler
- Center for Microbial Pathogenesis, Institute for Biomedical Sciences, Georgia State University, Atlanta, USA
| | - Stephen J Polyak
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, USA.
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23
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Stamatikos A, Vojtech L, Dronadula N, Dichek D. Abstract 432: Endothelial Cells Express miR-33a-5p and Release Extracellular Vesicles Containing miR-33a-5p. Arterioscler Thromb Vasc Biol 2016. [DOI: 10.1161/atvb.36.suppl_1.432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background:
The microRNA miR-33a-5p increases cellular cholesterol by posttranscriptional silencing of genes involved in cholesterol efflux. Previous studies showed that miR-33a-5p inhibition protects against atherosclerosis. Atheroprotective effects of miR-33a-5p inhibition are attributed to actions in hepatocytes that raise plasma HDL and actions in macrophages that enhance cholesterol efflux. We hypothesized that miR-33a-5p is also expressed in primary arterial endothelial cells (EC) and that miR-33a-5p might contribute to atherosclerosis by promoting cholesterol accumulation in EC. We also hypothesized that EC could release miR-33a-5p in extracellular vesicles (EV; including exosomes and microvesicles) that transferred miR-33a-5p to neighboring vascular cells such as SMC and macrophages, inhibiting cholesterol efflux, promoting lipid accumulation in these cells, and accelerating atherosclerosis.
Methods:
We cultured bovine aortic endothelial cells (BAEC) in serum-free medium, collected the medium, and isolated EV by ultracentrifugation. To test whether we had isolated EV, we compared EV and BAEC lysates by SDS-PAGE, Coomassie blue staining, and immunoblotting. We measured EV size with nanoparticle tracking analysis and imaged the particles with transmission electron microscopy. We extracted total RNA from BAEC and EV, measured RNA size using BioAnalyzer, and detected miR-33a-5p expression using RT-PCR and restriction digestion as well as qRT-PCR.
Results:
Coomassie blue staining revealed large differences between BAEC and EV lysates. The exosome marker CD9 was present at higher levels in EV lysate compared to BAEC lysate. Most of the EV were in the size range of exosomes, and appeared as typical lipid membrane-bound spheres by electron microscopy. EV contained primarily small RNA (~25-200 nucleotides). miR-33a-5p was detected both in BAEC lysates and in detergent-soluble EV.
Conclusions:
Primary arterial EC express miR-33a-5p and release EV rich in small RNA, including miR-33a-5p. Manipulating miR-33a-5p expression in EC, for example with a miR-33a-5p antagomiR, may be an effective therapeutic approach for increasing cholesterol efflux from multiple vessel wall cell types and preventing/reversing atherosclerosis.
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Affiliation(s)
| | - Lucia Vojtech
- Dept of Obstetrics and Gynecology, Univ of Washington, Seattle, WA
| | | | - David Dichek
- Dept of Medicine, Univ of Washington, Seattle, WA
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24
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Hladik F, Burgener A, Ballweber L, Gottardo R, Vojtech L, Fourati S, Dai JY, Cameron MJ, Strobl J, Hughes SM, Hoesley C, Andrew P, Johnson S, Piper J, Friend DR, Ball TB, Cranston RD, Mayer KH, McElrath MJ, McGowan I. Correction: Musosal effects for tenofovir 1% gel. eLife 2015; 4. [PMID: 25803485 PMCID: PMC4371375 DOI: 10.7554/elife.07586] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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25
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Hladik F, Burgener A, Ballweber L, Gottardo R, Vojtech L, Fourati S, Dai JY, Cameron MJ, Strobl J, Hughes SM, Hoesley C, Andrew P, Johnson S, Piper J, Friend DR, Ball TB, Cranston RD, Mayer KH, McElrath MJ, McGowan I. Mucosal effects of tenofovir 1% gel. eLife 2015; 4. [PMID: 25647729 PMCID: PMC4391502 DOI: 10.7554/elife.04525] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [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: 08/27/2014] [Accepted: 02/02/2015] [Indexed: 02/07/2023] Open
Abstract
Tenofovir gel is being evaluated for vaginal and rectal pre-exposure prophylaxis against HIV transmission. Because this is a new prevention strategy, we broadly assessed its effects on the mucosa. In MTN-007, a phase-1, randomized, double-blinded rectal microbicide trial, we used systems genomics/proteomics to determine the effect of tenofovir 1% gel, nonoxynol-9 2% gel, placebo gel or no treatment on rectal biopsies (15 subjects/arm). We also treated primary vaginal epithelial cells from four healthy women with tenofovir in vitro. After seven days of administration, tenofovir 1% gel had broad-ranging effects on the rectal mucosa, which were more pronounced than, but different from, those of the detergent nonoxynol-9. Tenofovir suppressed anti-inflammatory mediators, increased T cell densities, caused mitochondrial dysfunction, altered regulatory pathways of cell differentiation and survival, and stimulated epithelial cell proliferation. The breadth of mucosal changes induced by tenofovir indicates that its safety over longer-term topical use should be carefully monitored.
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Affiliation(s)
- Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, United States
| | - Adam Burgener
- Department of Medical Microbiology, University of Manitoba, Winnipeg, Canada
| | - Lamar Ballweber
- Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Raphael Gottardo
- Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, United States
| | - Slim Fourati
- Vaccine and Gene Therapy Institute of Florida, Port Saint Lucie, United States
| | - James Y Dai
- Department of Biostatistics, University of Washington, Seattle, United States
| | - Mark J Cameron
- Vaccine and Gene Therapy Institute of Florida, Port Saint Lucie, United States
| | - Johanna Strobl
- Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Research Center, Seattle, United States
| | - Sean M Hughes
- Department of Obstetrics and Gynecology, University of Washington, Seattle, United States
| | - Craig Hoesley
- Department of Medicine, University of Alabama, Birmingham, United States
| | | | | | - Jeanna Piper
- Division of AIDS, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, United States
| | - David R Friend
- CONRAD, Eastern Virginia Medical School, Arlington, United States
| | - T Blake Ball
- Department of Medical Microbiology, University of Manitoba, Winnipeg, Canada
| | - Ross D Cranston
- University of Pittsburgh School of Medicine, Pittsburgh, United States
| | - Kenneth H Mayer
- Fenway Health, Beth Israel Deaconess Hospital, Harvard Medical School, Boston, United States
| | - M Juliana McElrath
- Department of Medicine, University of Washington, Seattle, United States
| | - Ian McGowan
- University of Pittsburgh School of Medicine, Pittsburgh, United States
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Seaton KE, Ballweber L, Lan A, Donathan M, Hughes S, Vojtech L, Moody MA, Liao HX, Haynes BF, Galloway CG, Richardson BA, Karim SA, Dezzutti CS, McElrath MJ, Tomaras GD, Hladik F. HIV-1 specific IgA detected in vaginal secretions of HIV uninfected women participating in a microbicide trial in Southern Africa are primarily directed toward gp120 and gp140 specificities. PLoS One 2014; 9:e101863. [PMID: 25054205 PMCID: PMC4108330 DOI: 10.1371/journal.pone.0101863] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [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: 03/04/2014] [Accepted: 06/12/2014] [Indexed: 11/18/2022] Open
Abstract
Background Many participants in microbicide trials remain uninfected despite ongoing exposure to HIV-1. Determining the emergence and nature of mucosal HIV-specific immune responses in such women is important, since these responses may contribute to protection and could provide insight for the rational design of HIV-1 vaccines. Methods and Findings We first conducted a pilot study to compare three sampling devices (Dacron swabs, flocked nylon swabs and Merocel sponges) for detection of HIV-1-specific IgG and IgA antibodies in vaginal secretions. IgG antibodies from HIV-1-positive women reacted broadly across the full panel of eight HIV-1 envelope (Env) antigens tested, whereas IgA antibodies only reacted to the gp41 subunit. No Env-reactive antibodies were detected in the HIV-negative women. The three sampling devices yielded equal HIV-1-specific antibody titers, as well as total IgG and IgA concentrations. We then tested vaginal Dacron swabs archived from 57 HIV seronegative women who participated in a microbicide efficacy trial in Southern Africa (HPTN 035). We detected vaginal IgA antibodies directed at HIV-1 Env gp120/gp140 in six of these women, and at gp41 in another three women, but did not detect Env-specific IgG antibodies in any women. Conclusion Vaginal secretions of HIV-1 infected women contained IgG reactivity to a broad range of Env antigens and IgA reactivity to gp41. In contrast, Env-binding antibodies in the vaginal secretions of HIV-1 uninfected women participating in the microbicide trial were restricted to the IgA subtype and were mostly directed at HIV-1 gp120/gp140.
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Affiliation(s)
- Kelly E. Seaton
- Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - Lamar Ballweber
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Audrey Lan
- Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - Michele Donathan
- Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - Sean Hughes
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - M. Anthony Moody
- Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - Hua-Xin Liao
- Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - Barton F. Haynes
- Duke Human Vaccine Institute, Durham, North Carolina, United States of America
| | - Christine G. Galloway
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Barbra A. Richardson
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Biostatistics, University of Washington, Seattle, Washington, United States of America
| | - Salim Abdool Karim
- CAPRISA - Centre for the AIDS Programme of Research in South Africa, Nelson R Mandela School of Medicine, University of KwaZulu-Natal, Durban, South Africa
- Department of Epidemiology, Columbia University, New York, New York, United States of America
| | - Charlene S. Dezzutti
- Department of Obstetrics, Gynecology and Reproductive Sciences, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, United States of America
| | - M. Juliana McElrath
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, United States of America
- Department of Global Health, University of Washington, Seattle, Washington, United States of America
| | - Georgia D. Tomaras
- Duke Human Vaccine Institute, Durham, North Carolina, United States of America
- * E-mail: (GDT); (FH)
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- * E-mail: (GDT); (FH)
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Vojtech L, Woo S, Hughes S, Levy C, Ballweber L, Sauteraud RP, Strobl J, Westerberg K, Gottardo R, Tewari M, Hladik F. Exosomes in human semen carry a distinctive repertoire of small non-coding RNAs with potential regulatory functions. Nucleic Acids Res 2014; 42:7290-304. [PMID: 24838567 PMCID: PMC4066774 DOI: 10.1093/nar/gku347] [Citation(s) in RCA: 401] [Impact Index Per Article: 40.1] [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: 12/17/2013] [Revised: 04/01/2014] [Accepted: 04/11/2014] [Indexed: 12/21/2022] Open
Abstract
Semen contains relatively ill-defined regulatory components that likely aid fertilization, but which could also interfere with defense against infection. Each ejaculate contains trillions of exosomes, membrane-enclosed subcellular microvesicles, which have immunosuppressive effects on cells important in the genital mucosa. Exosomes in general are believed to mediate inter-cellular communication, possibly by transferring small RNA molecules. We found that seminal exosome (SE) preparations contain a substantial amount of RNA from 20 to 100 nucleotides (nts) in length. We sequenced 20-40 and 40-100 nt fractions of SE RNA separately from six semen donors. We found various classes of small non-coding RNA, including microRNA (21.7% of the RNA in the 20-40 nt fraction) as well as abundant Y RNAs and tRNAs present in both fractions. Specific RNAs were consistently present in all donors. For example, 10 (of ∼2600 known) microRNAs constituted over 40% of mature microRNA in SE. Additionally, tRNA fragments were strongly enriched for 5'-ends of 18-19 or 30-34 nts in length; such tRNA fragments repress translation. Thus, SE could potentially deliver regulatory signals to the recipient mucosa via transfer of small RNA molecules.
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Affiliation(s)
- Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, USA
| | - Sangsoon Woo
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, USA
| | - Sean Hughes
- Department of Obstetrics and Gynecology, University of Washington, Seattle, USA
| | - Claire Levy
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, USA
| | - Lamar Ballweber
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, USA
| | - Renan P Sauteraud
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, USA
| | - Johanna Strobl
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, USA
| | - Katharine Westerberg
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, USA
| | - Raphael Gottardo
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, USA Department of Medicine, University of Washington, Seattle, USA
| | - Muneesh Tewari
- Department of Medicine, University of Washington, Seattle, USA Human Biology Division, Fred Hutchinson Cancer Research Center, Seattle, USA
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, USA Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, USA Department of Medicine, University of Washington, Seattle, USA
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28
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Vojtech L, Hughes S, Levy C, Tewari M, Hladik F. Exosomes in human semen impair antigen-presenting cell function and decrease antigen-specific T cell responses (MUC7P.767). The Journal of Immunology 2014. [DOI: 10.4049/jimmunol.192.supp.197.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Exposure to semen is the primary route of transmission for many sexually transmitted infections. Mounting evidence suggests that components in semen directly influence leukocytes, which could help to explain the difficulty of inducing vaccination-based protection in the genital mucosa. Exosomes, small microvesicles with demonstrated immunomodulatory functions, are present at an average concentration of 2.2 x 1013 particles per ejaculate (n = 18 healthy semen donors). These seminal exosomes (SE) efficiently and rapidly entered peripheral and vaginal dendritic cells (DCs), whereas T cell uptake of SE was poor. SE impaired the immune responses of DCs stimulated by bacterial lipopolysaccharide, where cytokine production was reduced at both the mRNA level in the cells and the protein level in supernatants. Preliminary experiments also indicated that SE down-regulate CD80 and CD83 expression on DCs. In PBMC cultures, SE impaired memory T cell function, reducing the production of TNF-alpha and/or IFN-gamma in response to virus-derived peptides an average of 73% for CD4+ T cells and 55% for CD8+ T cells, in a dose-responsive manner (n = 4 PBMC donors). Thus, SE likely inhibit antigen-specific T cell responses by affecting the co-stimulatory capacity of antigen-presenting cells. Understanding how programmed immune responses are altered by the presence of semen is important to developing the next generation of vaccine and preventative treatments against sexually transmitted disease.
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Affiliation(s)
- Lucia Vojtech
- 1Obstetrics and Gynecology, University of Washington, Seattle, WA
| | - Sean Hughes
- 1Obstetrics and Gynecology, University of Washington, Seattle, WA
| | - Claire Levy
- 2Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA
| | - Muneesh Tewari
- 4Human Biology Division, Fred Hutchinson Cancer Research Center, Seattle, WA
- 3Medicine, University of Wash, Seattle, WA
| | - Florian Hladik
- 1Obstetrics and Gynecology, University of Washington, Seattle, WA
- 3Medicine, University of Wash, Seattle, WA
- 2Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA
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McKinnon LR, Hughes SM, De Rosa SC, Martinson JA, Plants J, Brady KE, Gumbi PP, Adams DJ, Vojtech L, Galloway CG, Fialkow M, Lentz G, Gao D, Shu Z, Nyanga B, Izulla P, Kimani J, Kimwaki S, Bere A, Moodie Z, Landay AL, Passmore JAS, Kaul R, Novak RM, McElrath MJ, Hladik F. Optimizing viable leukocyte sampling from the female genital tract for clinical trials: an international multi-site study. PLoS One 2014; 9:e85675. [PMID: 24454917 PMCID: PMC3893217 DOI: 10.1371/journal.pone.0085675] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [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: 10/10/2013] [Accepted: 12/06/2013] [Indexed: 11/18/2022] Open
Abstract
Background Functional analysis of mononuclear leukocytes in the female genital mucosa is essential for understanding the immunologic effects of HIV vaccines and microbicides at the site of HIV exposure. However, the best female genital tract sampling technique is unclear. Methods and Findings We enrolled women from four sites in Africa and the US to compare three genital leukocyte sampling methods: cervicovaginal lavages (CVL), endocervical cytobrushes, and ectocervical biopsies. Absolute yields of mononuclear leukocyte subpopulations were determined by flow cytometric bead-based cell counting. Of the non-invasive sampling types, two combined sequential cytobrushes yielded significantly more viable mononuclear leukocytes than a CVL (p<0.0001). In a subsequent comparison, two cytobrushes yielded as many leukocytes (∼10,000) as one biopsy, with macrophages/monocytes being more prominent in cytobrushes and T lymphocytes in biopsies. Sample yields were consistent between sites. In a subgroup analysis, we observed significant reproducibility between replicate same-day biopsies (r = 0.89, p = 0.0123). Visible red blood cells in cytobrushes increased leukocyte yields more than three-fold (p = 0.0078), but did not change their subpopulation profile, indicating that these leukocytes were still largely derived from the mucosa and not peripheral blood. We also confirmed that many CD4+ T cells in the female genital tract express the α4β7 integrin, an HIV envelope-binding mucosal homing receptor. Conclusions CVL sampling recovered the lowest number of viable mononuclear leukocytes. Two cervical cytobrushes yielded comparable total numbers of viable leukocytes to one biopsy, but cytobrushes and biopsies were biased toward macrophages and T lymphocytes, respectively. Our study also established the feasibility of obtaining consistent flow cytometric analyses of isolated genital cells from four study sites in the US and Africa. These data represent an important step towards implementing mucosal cell sampling in international clinical trials of HIV prevention.
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Affiliation(s)
- Lyle R. McKinnon
- Department of Medicine, University of Toronto, Toronto, Canada
- Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
| | - Sean M. Hughes
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Stephen C. De Rosa
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, United States of America
| | - Jeffrey A. Martinson
- Department of Immunology and Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Jill Plants
- Department of Immunology and Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Kirsten E. Brady
- Department of Immunology and Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Pamela P. Gumbi
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Devin J. Adams
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Lucia Vojtech
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Christine G. Galloway
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Michael Fialkow
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Gretchen Lentz
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
| | - Dayong Gao
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, United States of America
| | - Zhiquan Shu
- Department of Mechanical Engineering, University of Washington, Seattle, Washington, United States of America
| | - Billy Nyanga
- Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
| | - Preston Izulla
- Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
| | - Joshua Kimani
- Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
| | - Steve Kimwaki
- Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
| | - Alfred Bere
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Zoe Moodie
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
| | - Alan L. Landay
- Department of Immunology and Microbiology, Rush University Medical Center, Chicago, Illinois, United States of America
| | - Jo-Ann S. Passmore
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
- National Health Laboratory Services, Cape Town, South Africa
| | - Rupert Kaul
- Department of Medicine, University of Toronto, Toronto, Canada
- Department of Medical Microbiology, University of Nairobi, Nairobi, Kenya
- Department of Medicine, University Health Network, Toronto, Canada
| | - Richard M. Novak
- College of Medicine, University of Illinois, Chicago, Illinois, United States of America
| | - M. Juliana McElrath
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- Department of Laboratory Medicine, University of Washington, Seattle, Washington, United States of America
- Department of Global Health, University of Washington, Seattle, Washington, United States of America
| | - Florian Hladik
- Department of Obstetrics and Gynecology, University of Washington, Seattle, Washington, United States of America
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
- * E-mail:
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Taylor JA, Vojtech L, Bahner I, Kohn DB, Laer DV, Russell DW, Richard RE. Foamy virus vectors expressing anti-HIV transgenes efficiently block HIV-1 replication. Mol Ther 2007; 16:46-51. [PMID: 17955023 DOI: 10.1038/sj.mt.6300335] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Gene therapy has the potential to control human immunodeficiency virus (HIV) in patients who do not respond to traditional antiviral therapy. In this study, we tested foamy virus (FV) vectors expressing three anti-HIV transgenes, both individually and in a combination vector. The transgenes tested in this study are RevM10, a dominant negative version of the viral rev protein, Sh1, a short hairpin RNA directed against a conserved overlapping sequence of tat and rev, and membrane-associated C46 (maC46), a membrane-attached peptide that blocks HIV cell entry. FV vectors efficiently transduce hematopoietic stem cells and, unlike lentivirus (LV) vectors, do not share viral proteins with HIV. The titers of the FV vectors described in this study were not affected by anti-HIV transgenes. On a direct comparison of FV vectors expressing the individual transgenes, entry inhibition using the maC46 transgene was found to be the most effective at blocking HIV replication. A clinically relevant FV vector expressing three anti-HIV transgenes effectively blocked HIV infection in primary macrophages derived from transduced, peripheral blood CD34-selected cells and in a cell line used for propagating HIV, CEMx174. These results suggest that there are potential benefits of using FV vectors in HIV gene therapy.
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Affiliation(s)
- Jason A Taylor
- Department of Medicine, University of Washington, Seattle, Washington, USA
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Jones-Engel L, Steinkraus KA, Murray SM, Engel GA, Grant R, Aggimarangsee N, Lee BPYH, May C, Schillaci MA, Somgird C, Sutthipat T, Vojtech L, Zhao J, Linial ML. Sensitive assays for simian foamy viruses reveal a high prevalence of infection in commensal, free-ranging Asian monkeys. J Virol 2007; 81:7330-7. [PMID: 17475645 PMCID: PMC1933339 DOI: 10.1128/jvi.00343-07] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [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] [Indexed: 11/20/2022] Open
Abstract
Foamy viruses (FV) are retroviruses that naturally infect many hosts, including most nonhuman primates (NHPs). Zoonotic infection by primate FV has been documented in people in Asia who reported contact with free-ranging macaques. FV transmission in Asia is a concern, given abundant human-NHP contact, particularly at monkey temples and in urban settings. We have developed three assays capable of detecting the presence of FV in Asian NHP species that are commensal with humans: enzyme-linked immunosorbent assay (ELISA), Western blot assays using recombinant viral Gag protein, and an indicator cell line that can detect macaque FV. The recombinant ELISA correlates very well with the presence of FV sequences detected by PCR. We have used these assays to demonstrate both that FV is highly prevalent among free-ranging NHPs and that seroconversion occurs at a young age in these animals. These assays should also prove useful for large-scale analysis of the prevalence of FV infections in human populations in Asia that are commensal with free-ranging NHPs.
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Affiliation(s)
- Lisa Jones-Engel
- Washington National Primate Research Center, University of Washington, Seattle, Washington, USA
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Burke B, Derby NR, Kraft Z, Saunders CJ, Dai C, Llewellyn N, Zharkikh I, Vojtech L, Zhu T, Srivastava IK, Barnett SW, Stamatatos L. Viral evolution in macaques coinfected with CCR5- and CXCR4-tropic SHIVs in the presence or absence of vaccine-elicited anti-CCR5 SHIV neutralizing antibodies. Virology 2006; 355:138-51. [PMID: 16920175 DOI: 10.1016/j.virol.2006.07.026] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [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: 03/28/2006] [Revised: 06/08/2006] [Accepted: 07/11/2006] [Indexed: 11/21/2022]
Abstract
Macaques were immunized with SF162 Env-based gp140 immunogens and challenged simultaneously with the CCR5-tropic homologous SHIV(SF162P4) and the CXCR4-tropic heterologous SHIV(SF33A) viruses. Both mock-immunized and immunized animals became dually infected. Prior immunization preferentially reduced the viral replication of the homologous virus during primary infection but the relative replication of the two coinfecting viruses during chronic infection was unaffected by prior immunization, despite the fact that five of six immunized animals maintained a significantly lower overall viral replication that the control animals. Neutralizing antibodies participated in controlling the replication of SHIV(SF162P4), but not that of SHIV(SF33A). Dual infection resulted in the emergence and predominance within the circulating CCR5 virus pool, of a variant with a distinct neutralization phenotype. The signature of this variant was the presence of three amino acid changes in gp120, two of which were located in the receptor and coreceptor binding sites. Also, a significant fraction of the viruses circulating in the blood, as early as two weeks post-infection, was recombinants and prior immunization did not prevent their emergence. These findings provide new insights into the dynamic interaction of CCR5- and CXCR4-tropic HIV isolates that are potentially relevant in better understanding HIV-mediated pathogenesis.
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Affiliation(s)
- Brian Burke
- Seattle Biomedical Research Institute, Seattle, WA 98109, USA
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Taylor JA, Vojtech L, Olson EM, Allen JM, Trobridge GD, Russell DW, Richard RE. 372. Optimizing Foamy Virus Vectors That Inhibit HIV Infection. Mol Ther 2006. [DOI: 10.1016/j.ymthe.2006.08.431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Buckner C, Gines LG, Saunders CJ, Vojtech L, Srivastava I, Gettie A, Bohm R, Blanchard J, Barnett SW, Safrit JT, Stamatatos L. Priming B cell-mediated anti-HIV envelope responses by vaccination allows for the long-term control of infection in macaques exposed to a R5-tropic SHIV. Virology 2004; 320:167-80. [PMID: 15003872 DOI: 10.1016/j.virol.2003.12.003] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [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: 09/24/2003] [Revised: 12/02/2003] [Accepted: 12/03/2003] [Indexed: 11/18/2022]
Abstract
The potential of vaccine-elicited anti-HIV envelope antibodies to control HIV-infection was evaluated by immunizing macaques with the HIV envelope protein and transiently depleting them of their CD8+ cells before intravenous challenge with the pathogenic CCR5-tropic SIV/HIV chimeric virus, SHIV(SF162P4). Although sterilizing immunity was not achieved, all vaccinated animals effectively controlled infection and remained free of disease for the duration of observation (over 3 years). In contrast, during the same period, the control animals progressed to disease. Both the vaccinees and the controls developed robust cell-mediated antiviral and neutralizing antibody responses following infection. A comparative analysis of these responses suggests that the more effective long-term control of infection by the vaccinated animals is due to the more rapid development of anti-HIV envelope antibodies. These studies suggest that priming by vaccination of B cell anti-HIV envelope responses maybe crucial for the long-term control of HIV infection.
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Affiliation(s)
- Clarisa Buckner
- Aaron Diamond AIDS Research Center, The Rockefeller University, New York, NY 10016, USA
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35
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Srivastava IK, Stamatatos L, Kan E, Vajdy M, Lian Y, Hilt S, Martin L, Vita C, Zhu P, Roux KH, Vojtech L, C Montefiori D, Donnelly J, Ulmer JB, Barnett SW. Purification, characterization, and immunogenicity of a soluble trimeric envelope protein containing a partial deletion of the V2 loop derived from SF162, an R5-tropic human immunodeficiency virus type 1 isolate. J Virol 2003; 77:11244-59. [PMID: 14512572 PMCID: PMC224963 DOI: 10.1128/jvi.77.20.11244-11259.2003] [Citation(s) in RCA: 127] [Impact Index Per Article: 6.0] [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] [Indexed: 11/20/2022] Open
Abstract
The envelope (Env) glycoprotein of human immunodeficiency virus type 1 (HIV-1) is the major target of neutralizing antibody responses and is likely to be a critical component of an effective vaccine against AIDS. Although monomeric HIV envelope subunit vaccines (gp120) have induced high-titer antibody responses and neutralizing antibodies against laboratory-adapted HIV-1 strains, they have failed to induce neutralizing antibodies against diverse heterologous primary HIV isolates. Most probably, the reason for this failure is that the antigenic structure(s) of these previously used immunogens does not mimic that of the functional HIV envelope, which is a trimer, and thus these immunogens do not elicit high titers of relevant functional antibodies. We recently reported that an Env glycoprotein immunogen (o-gp140SF162DeltaV2) containing a partial deletion in the second variable loop (V2) derived from the R5-tropic HIV-1 isolate SF162, when used in a DNA priming-protein boosting vaccine regimen in rhesus macaques, induced neutralizing antibodies against heterologous subtype B primary isolates as well as protection to the vaccinated animals upon challenge with pathogenic SHIV(SF162P4) virus. Here we describe the purification of this protein to homogeneity, its characterization as trimer, and its ability to induce primary isolate-neutralizing responses in rhesus macaques. Optimal mutations in the primary and secondary protease cleavage sites of the env gene were identified that resulted in the stable secretion of a trimeric Env glycoprotein in mammalian cell cultures. We determined the molecular mass and hydrodynamic radius (R(h)) using a triple detector analysis (TDA) system. The molecular mass of the oligomer was found to be 324 kDa, close to the expected M(w) of a HIV envelope trimer protein (330 kDa), and the hydrodynamic radius was 7.27 nm. Negative staining electron microscopy of o-gp140SF162DeltaV2 showed that it is a trimer with considerable structural flexibility and supported the data obtained by TDA. The structural integrity of the purified trimeric protein was also confirmed by determinations of its ability to bind the HIV receptor, CD4, and its ability to bind a panel of well-characterized neutralizing monoclonal antibodies. No deleterious effect of V2 loop deletion was observed on the structure and conformation of the protein, and several critical neutralization epitopes were preserved and well exposed on the purified o-gp140SF162DeltaV2 protein. In an intranasal priming and intramuscular boosting regimen, this protein induced high titers of functional antibodies, which neutralized the vaccine strain, i.e., SF162. These results highlight a potential role for the trimeric o-gp140SF162DeltaV2 Env immunogen in a successful HIV vaccine.
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Srivastava IK, VanDorsten K, Vojtech L, Barnett SW, Stamatatos L. Changes in the immunogenic properties of soluble gp140 human immunodeficiency virus envelope constructs upon partial deletion of the second hypervariable region. J Virol 2003; 77:2310-20. [PMID: 12551968 PMCID: PMC141106 DOI: 10.1128/jvi.77.4.2310-2320.2003] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.7] [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] [Indexed: 11/20/2022] Open
Abstract
Immunization of macaques with the soluble oligomeric gp140 form of the SF162 envelope (SF162gp140) or with an SF162gp140-derived construct lacking the central region of the V2 loop (DeltaV2gp140) results in the generation of high titers of antibodies capable of neutralizing the homologous human immunodeficiency virus type 1 (HIV-1), SF162 virus (Barnett et al. J. Virol. 75:5526-5540, 2001). However, the DeltaV2gp140 immunogen is more effective than the SF162gp140 immunogen in eliciting the generation of antibodies capable of neutralizing heterologous HIV-1 isolates. This indicates that deletion of the V2 loop alters the immunogenicity of the SF162gp140 protein. The present studies were aimed at identifying the envelope regions whose immunogenicity is altered following V2 loop deletion. We report that the antibodies elicited by the SF162gp140 immunogen recognize elements of the V1, V2, and V3 loops, the CD4-binding site, and the C1 and C2 regions on the homologous SF162 gp120. With the exception of the V1 and V2 loops, the same regions are recognized on heterologous gp120 proteins. Surprisingly, although a minority of the SF162gp140-elicited antibodies target the V3 loop on the homologous gp120, the majority of the antibodies elicited by this immunogen that are capable of binding to the heterologous gp120s tested recognize their V3 loops. Deletion of the V2 loop has two effects. First, it alters the immunogenicity of the V3 and V1 loops, and second, it renders the C5 region immunogenic. Although deletion of the V2 loop does not result in an increase in the immunogenicity of the CD4-binding site per se, the relative ratio of anti-CD4-binding site to anti-V3 loop antibodies that bind to the heterologous gp120s tested is higher in sera collected from the DeltaV2gp140-immunized animals than in the SF162gp140-immunized animals. Overall, our studies indicate that it is possible to alter the immunogenic structure of the HIV envelope by introducing specific modifications.
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