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Reeves PM, Raju Paul S, Baeten L, Korek SE, Yi Y, Hess J, Sobell D, Scholzen A, Garritsen A, De Groot AS, Moise L, Brauns T, Bowen R, Sluder AE, Poznansky MC. Novel multiparameter correlates of Coxiella burnetii infection and vaccination identified by longitudinal deep immune profiling. Sci Rep 2020; 10:13311. [PMID: 32770104 PMCID: PMC7414860 DOI: 10.1038/s41598-020-69327-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 06/05/2020] [Indexed: 12/12/2022] Open
Abstract
Q-fever is a flu-like illness caused by Coxiella burnetii (Cb), a highly infectious intracellular bacterium. There is an unmet need for a safe and effective vaccine for Q-fever. Correlates of immune protection to Cb infection are limited. We proposed that analysis by longitudinal high dimensional immune (HDI) profiling using mass cytometry combined with other measures of vaccination and protection could be used to identify novel correlates of effective vaccination and control of Cb infection. Using a vaccine-challenge model in HLA-DR transgenic mice, we demonstrated significant alterations in circulating T-cell and innate immune populations that distinguished vaccinated from naïve mice within 10 days, and persisted until at least 35 days post-vaccination. Following challenge, vaccinated mice exhibited reduced bacterial burden and splenomegaly, along with distinct effector T-cell and monocyte profiles. Correlation of HDI data to serological and pathological measurements was performed. Our data indicate a Th1-biased response to Cb, consistent with previous reports, and identify Ly6C, CD73, and T-bet expression in T-cell, NK-cell, and monocytic populations as distinguishing features between vaccinated and naïve mice. This study refines the understanding of the integrated immune response to Cb vaccine and challenge, which can inform the assessment of candidate vaccines for Cb.
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Affiliation(s)
- P M Reeves
- Vaccine and Immunotherapy Center, Massachusetts General Hospital, Boston, MA, USA.
| | - S Raju Paul
- Vaccine and Immunotherapy Center, Massachusetts General Hospital, Boston, MA, USA
| | - L Baeten
- Colorado State University, Fort Collins, CO, USA
| | - S E Korek
- Vaccine and Immunotherapy Center, Massachusetts General Hospital, Boston, MA, USA
| | - Y Yi
- Vaccine and Immunotherapy Center, Massachusetts General Hospital, Boston, MA, USA
| | - J Hess
- Vaccine and Immunotherapy Center, Massachusetts General Hospital, Boston, MA, USA
| | - D Sobell
- Vaccine and Immunotherapy Center, Massachusetts General Hospital, Boston, MA, USA
| | - A Scholzen
- InnatOss Laboratories B.V, Oss, The Netherlands
| | - A Garritsen
- InnatOss Laboratories B.V, Oss, The Netherlands
| | - A S De Groot
- EpiVax, Inc, Providence, RI, USA.,Center for Vaccines and Immunology, University of Georgia, Athens, GA, USA
| | - L Moise
- EpiVax, Inc, Providence, RI, USA.,Institute for Immunology and Informatics, Department of Cell and Molecular Biology, University of Rhode Island, Providence, RI, USA
| | - T Brauns
- Vaccine and Immunotherapy Center, Massachusetts General Hospital, Boston, MA, USA
| | - R Bowen
- Colorado State University, Fort Collins, CO, USA
| | - A E Sluder
- Vaccine and Immunotherapy Center, Massachusetts General Hospital, Boston, MA, USA
| | - M C Poznansky
- Vaccine and Immunotherapy Center, Massachusetts General Hospital, Boston, MA, USA.
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Hashim Arrifin N, Yuan J, Kashiwagi S, Nguyen M, Jean-Mary G, Nezivar J, Yang Y, Leblanc P, Brauns T, Poznansky M. A mycobacterial heat shock protein 70-based fusion protein targeting mesothelin induces dendritic cell maturation and cross-presentation in a murine model of ovarian carcinoma. Gynecol Oncol 2014. [DOI: 10.1016/j.ygyno.2014.03.241] [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: 11/27/2022]
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Schneider JP, Krohmer S, Brauns T, Kahn T, Zimmer C. Gehirnparenchymveränderungen im MRT bei akuter arterieller Hypertonie - posterior, reversibel und enzephalopathisch? ROFO-FORTSCHR RONTG 2005. [DOI: 10.1055/s-2005-868337] [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]
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Brauns T, Prinz H, Kimball SD, Haugland RP, Striessnig J, Glossmann H. L-type calcium channels: binding domains for dihydropyridines and benzothiazepines are located in close proximity to each other. Biochemistry 1997; 36:3625-31. [PMID: 9132014 DOI: 10.1021/bi9613584] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We investigated the binding of a fluorescent diltiazem analogue (3R,4S)-cis-1-[2-[[3-[[3-[4,4-difluoro-3a,4-dihydro-5,7-dimethyl-4-bo ra-3a,4a-diaza-s-indacen-3-yl]propionyl]amino]propyl]amin o]ethy]-1,3,4,5-tetrahydro-3-hydroxy-4-(4-methoxyphenyl)-6-(triflu oromethyl)-2H-1-benzazepin-2-one (DMBODIPY-BAZ) to L-type Ca2+ channels in the presence of different 1,4-dihydropyridines (DHPs) by using fluorescence resonance energy transfer (FRET) [Brauns, T., Cai, Z.-W., Kimball, S. D., Kang, H.-C., Haugland, R. P., Berger, W., Berjukov, S., Hering, S., Glossmann, H., & Striessnig, J. (1995) Biochemistry 34, 3461]. When channels are occupied with DMBODIPY-BAZ, a rapid fluorescence change occurred upon addition of different DHPs. The direction of this intensity modulation was found to be only dependent on the chemical composition of the dihydropyridine employed. DHPs containing a nitro group decreased, whereas others (e.g., isradipine) enhanced the fluorescence signal. In addition, all DHPs markedly decreased the association rate constant for DMBODIPY-BAZ without affecting equilibrium binding. Both observations together are best explained by a steric model where the DHP binding site is located in close proximity to the accession pathway of DMBODIPY-BAZ.
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Affiliation(s)
- T Brauns
- Institut fur Biochemische Pharmakologie, Innsbruck, Austria
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Brauns T, Cai ZW, Kimball SD, Kang KC, Haugland RP, Berger W, Berjukov S, Hering S, Glossmann H, Striessnig J. Benzothiazepine binding domain of purified L-type calcium channels: direct labeling using a novel fluorescent diltiazem analogue. Biochemistry 1995; 34:3461-9. [PMID: 7880840 DOI: 10.1021/bi00010a039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We have synthesized a series of N-propylamino-substituted benzazepinones (NPSBs) as specific probes for the benzothiazepinone (BTZ) binding domain of muscle L-type calcium channels (LTCCs). NPSBs were identified which possess high affinity for the channel after purification. We synthesized a fluorescent NPSB, DMBODIPY-BAZ, as the first benz(othi)azepinone derivative known to reversibly label partially purified LTCCs. DMBODIPY-BAZ binds to the partially purified channel with high affinity (Kd = 25 nM, Bmax = 580 pmol/mg of protein). Fluorescence resonance energy transfer (FRET) occurred between tryptophan residues of the channel protein and the DMBODIPY fluorophore upon specific drug binding. FRET was exploited to allow highly time-resolved detection of specific drug binding kinetics. We found that the dissociation half-life (t1/2) of DMBODIPY-BAZ decreased with the concentration of an unlabeled competitor, which indicates ligand-induced accelerated dissociation. In contrast, t1/2 was concentration-dependently increased by the dihydropyridine (DHP) (+)-isradipine. These kinetic properties of DMBODIPY-BAZ indicate that a high-affinity BTZ binding domain also exists on purified LTCCs. NPSBs represent novel tools to provide further insight into the molecular pharmacology of the BTZ binding domain on LTCCs.
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Affiliation(s)
- T Brauns
- Institut für Biochemische Pharmakologie, Innsbruck, Australia
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