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Liu Z, Zhang X, Xiong S, Huang S, Ding X, Xu M, Yao J, Liu S, Zhao F. Endothelial dysfunction of syphilis: Pathogenesis. J Eur Acad Dermatol Venereol 2024; 38:1478-1490. [PMID: 38376088 DOI: 10.1111/jdv.19899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Accepted: 01/19/2024] [Indexed: 02/21/2024]
Abstract
Treponema pallidum is the causative factor of syphilis, a sexually transmitted disease (STD) characterized by perivascular infiltration of inflammatory cells, vascular leakage, swelling and proliferation of endothelial cells (ECs). The endothelium lining blood and lymphatic vessels is a key barrier separating body fluids from host tissues and is a major target of T. pallidum. In this review, we focus on how T. pallidum establish intimate interactions with ECs, triggering endothelial dysfunction such as endothelial inflammation, abnormal repairment and damage of ECs. In addition, we summarize that migration and invasion of T. pallidum across vascular ECs may occur through two pathways. These two mechanisms of transendothelial migration are paracellular and cholesterol-dependent, respectively. Herein, clarifying the relationship between T. pallidum and endothelial dysfunction is of great significance to provide novel strategies for diagnosis and prevention of syphilis, and has a great potential prospect of clinical application.
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Affiliation(s)
- Zhaoping Liu
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Hengyang Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Xiaohong Zhang
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Hengyang Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Shun Xiong
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Hengyang Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Shaobin Huang
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Hengyang Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Xuan Ding
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Hengyang Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Man Xu
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Hengyang Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Jiangchen Yao
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Hengyang Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Shuangquan Liu
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Hengyang Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Feijun Zhao
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Hengyang Medical College, University of South China, Hengyang, China
- Department of Clinical Laboratory Medicine, The First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
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Scott C, Dias AP, De Buck J. Adherence and metal-ion acquisition gene expression increases during infection with Treponema phagedenis strains from bovine digital dermatitis. Infect Immun 2024:e0011724. [PMID: 38940601 DOI: 10.1128/iai.00117-24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Accepted: 05/16/2024] [Indexed: 06/29/2024] Open
Abstract
Digital dermatitis (DD) is an ulcerative foot lesion on the heel bulbs of dairy cattle. DD is a polymicrobial disease with no precise etiology, although Treponema spirochetes are found disproportionally abundant in diseased tissue. Within Treponema, several different species are found in DD; however, the species Treponema phagedenis is uniformly found in copious quantities and deep within the skin layers of the active, ulcerative stages of disease. The pathogenic mechanisms these bacteria use to persist in the skin and the precise role they play in the pathology of DD are widely unknown. To explore the pathogenesis and virulence of Treponema phagedenis, newly isolated strains of this species were investigated in a subcutaneous murine abscess model. In the first trial, a dosage study was conducted to compare the pathogenicity of different strains across three different treponemes per inoculum (TPI) doses based on abscess volumes. In the second trial, the expression levels of 11 putative virulence genes were obtained to gain insight into their involvement in pathogenesis. During the RT-qPCR analysis, it was determined that genes encoding for two metal-ion import lipoproteins and two adherence genes were found highly upregulated during infection. Conversely, two genes involved in motility and chemotaxis were found to not be significantly upregulated or utilized during infection. These results were supported by gene expression data from natural M2 lesions of dairy cattle. This gene expression analysis could highlight the preference in strategy for T. phagedenis to persist and adhere in the host rather than engage in motility and disseminate.
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Affiliation(s)
- Colton Scott
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Angelica P Dias
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Jeroen De Buck
- Faculty of Veterinary Medicine, University of Calgary, Calgary, Alberta, Canada
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3
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Reid TB, Godornes C, Campbell VL, Laing KJ, Tantalo LC, Gomez A, Pholsena TN, Lieberman NAP, Krause TM, Cegielski VI, Culver LA, Nguyen N, Tong DQ, Hawley KL, Greninger AL, Giacani L, Cameron CE, Dombrowski JC, Wald A, Koelle DM. Treponema pallidum Periplasmic and Membrane Proteins Are Recognized by Circulating and Skin CD4+ T Cells. J Infect Dis 2024:jiae245. [PMID: 38932740 DOI: 10.1093/infdis/jiae245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Indexed: 06/28/2024] Open
Abstract
BACKGROUND Histologic and serologic studies suggest the induction of local and systemic Treponema pallidum-specific CD4+ T-cell responses to T. pallidum infection. We hypothesized that T. pallidum-specific CD4+ T cells are detectable in blood and in the skin rash of secondary syphilis and persist in both compartments after treatment. METHODS Peripheral blood mononuclear cells collected from 67 participants were screened by interferon-γ (IFN-γ) ELISPOT response to T. pallidum sonicate. T. pallidum-reactive T-cell lines from blood and skin were probed for responses to 89 recombinant T. pallidum antigens. Peptide epitopes and HLA class II restriction were defined for selected antigens. RESULTS We detected CD4+ T-cell responses to T. pallidum sonicate ex vivo. Using T. pallidum-reactive T-cell lines we observed recognition of 14 discrete proteins, 13 of which localize to bacterial membranes or the periplasmic space. After therapy, T. pallidum-specific T cells persisted for at least 6 months in skin and 10 years in blood. CONCLUSIONS T. pallidum infection elicits an antigen-specific CD4+ T-cell response in blood and skin. T. pallidum-specific CD4+ T cells persist as memory in both compartments long after curative therapy. The T. pallidum antigenic targets we identified may be high-priority vaccine candidates.
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Affiliation(s)
- Tara B Reid
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Charmie Godornes
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Victoria L Campbell
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Kerry J Laing
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Lauren C Tantalo
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Alloysius Gomez
- Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia, Canada
| | - Thepthara N Pholsena
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Nicole A P Lieberman
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
| | - Taylor M Krause
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Victoria I Cegielski
- Department of Medicine, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri, USA
| | - Lauren A Culver
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Nhi Nguyen
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Denise Q Tong
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
| | - Kelly L Hawley
- Department of Medicine and Pediatrics, UConn Health, Farmington, Connecticut, USA
- Division of Infectious Diseases, Connecticut Children's, Hartford, Connecticut, USA
| | - Alexander L Greninger
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
- Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Center, Seattle, Washington, USA
| | - Lorenzo Giacani
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
- Department of Global Health, University of Washington, Seattle, Washington, USA
| | - Caroline E Cameron
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
- Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia, Canada
| | - Julia C Dombrowski
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
- Department of Epidemiology, University of Washington School of Medicine, Seattle, Washington, USA
| | - Anna Wald
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
- Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Center, Seattle, Washington, USA
- Department of Global Health, University of Washington, Seattle, Washington, USA
- Department of Epidemiology, University of Washington School of Medicine, Seattle, Washington, USA
| | - David M Koelle
- Department of Medicine, University of Washington School of Medicine, Seattle, Washington, USA
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, Washington, USA
- Vaccine and Infectious Diseases Division, Fred Hutchinson Cancer Center, Seattle, Washington, USA
- Department of Global Health, University of Washington, Seattle, Washington, USA
- Center for Translational Immunology, Benaroya Research Institute, Seattle, Washington, USA
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Cao Q, Li Y, Hu Y, He B, Tang Y, Cao T, Peng B, Zhou X, Liu S. Serofast status in syphilis: Pathogenesis to therapeutics. Clin Chim Acta 2024; 560:119754. [PMID: 38815665 DOI: 10.1016/j.cca.2024.119754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2024] [Revised: 05/25/2024] [Accepted: 05/27/2024] [Indexed: 06/01/2024]
Abstract
Syphilis, a sexually transmitted infection caused by Treponema pallidum, has been experiencing a rise in prevalence in recent years. "Syphilis serofast" describes a unique serological reaction in patients with syphilis whose clinical symptoms have resolved following consistent anti-syphilitic therapy, but the non-Treponema pallidum antigen serologic test is still positive. Syphilis serofast is a risk factor for syphilis recurrence, neurosyphilis, and multisystem involvement. Considering the current lack of comprehensive knowledge about the epidemiological characteristics, pathogenesis, and therapies of syphilis serofast, we conducted an online search of research relating to syphilis serofast over the last twenty years. Previous research has shown that the pathogenesis of syphilis serofast is mainly related to clinical factors, immune factors, syphilis subtypes, and T.pallidum membrane protein repeat gene antigen. There are two distinct viewpoints on the treatment of serofast: no excessive treatment and active treatment. In addition, serofast patients also showed two clinical outcomes: syphilis recurrence and persistent serofast status. This article systematically reviews the related factors, treatment, and clinical outcomes of syphilis serofast, provides a theoretical basis for its research, diagnosis, and treatment, and helps clinicians develop a follow-up treatment management plan for syphilis serofast.
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Affiliation(s)
- Qian Cao
- Department of Clinical Laboratory Medicine, Institution of microbiology and infectious diseases, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China.
| | - Yue Li
- Department of Clinical Laboratory Medicine, Institution of microbiology and infectious diseases, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China.
| | - Yibao Hu
- Department of Clinical Laboratory Medicine, Institution of microbiology and infectious diseases, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China.
| | - Bisha He
- Department of Clinical Laboratory Medicine, Institution of microbiology and infectious diseases, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China.
| | - Yun Tang
- Department of Clinical Laboratory Medicine, Institution of microbiology and infectious diseases, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China.
| | - Ting Cao
- Department of Clinical Laboratory Medicine, Institution of microbiology and infectious diseases, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China.
| | - Binfeng Peng
- Center of Laboratory Medicine and Pathology, The First Affiliated Hospital of Hunan University of Chinese Medicine, Changsha 410007, China.
| | - Xiangping Zhou
- Department of Clinical Laboratory Medicine, Institution of microbiology and infectious diseases, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China.
| | - Shuangquan Liu
- Department of Clinical Laboratory Medicine, Institution of microbiology and infectious diseases, The First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, Hunan 421001, China.
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Ridgway R, Lu H, Blower TR, Evans NJ, Ainsworth S. Genomic and taxonomic evaluation of 38 Treponema prophage sequences. BMC Genomics 2024; 25:549. [PMID: 38824509 PMCID: PMC11144348 DOI: 10.1186/s12864-024-10461-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 05/28/2024] [Indexed: 06/03/2024] Open
Abstract
BACKGROUND Despite Spirochetales being a ubiquitous and medically important order of bacteria infecting both humans and animals, there is extremely limited information regarding their bacteriophages. Of the genus Treponema, there is just a single reported characterised prophage. RESULTS We applied a bioinformatic approach on 24 previously published Treponema genomes to identify and characterise putative treponemal prophages. Thirteen of the genomes did not contain any detectable prophage regions. The remaining eleven contained 38 prophage sequences, with between one and eight putative prophages in each bacterial genome. The prophage regions ranged from 12.4 to 75.1 kb, with between 27 and 171 protein coding sequences. Phylogenetic analysis revealed that 24 of the prophages formed three distinct sequence clusters, identifying putative myoviral and siphoviral morphology. ViPTree analysis demonstrated that the identified sequences were novel when compared to known double stranded DNA bacteriophage genomes. CONCLUSIONS In this study, we have started to address the knowledge gap on treponeme bacteriophages by characterising 38 prophage sequences in 24 treponeme genomes. Using bioinformatic approaches, we have been able to identify and compare the prophage-like elements with respect to other bacteriophages, their gene content, and their potential to be a functional and inducible bacteriophage, which in turn can help focus our attention on specific prophages to investigate further.
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Affiliation(s)
- Rachel Ridgway
- Department of Infection Biology and Microbiomes, University of Liverpool, Leahurst Campus, Chester High Road, Neston, Cheshire, CH64 7TE, UK.
| | - Hanshuo Lu
- Department of Infection Biology and Microbiomes, University of Liverpool, Biosciences Building, Crown Street, Liverpool, L69 7BE, UK
| | - Tim R Blower
- Department of Biosciences, Durham University, Stockton Road, Durham, DH1 3LE, UK
| | - Nicholas James Evans
- Department of Infection Biology and Microbiomes, University of Liverpool, Leahurst Campus, Chester High Road, Neston, Cheshire, CH64 7TE, UK
| | - Stuart Ainsworth
- Department of Infection Biology and Microbiomes, University of Liverpool, Liverpool Science Park IC2, 146 Brownlow Hill, Liverpool, L3 5RF, UK
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Víquez-R L, Henrich M, Riegel V, Bader M, Wilhelm K, Heurich M, Sommer S. A taste of wilderness: supplementary feeding of red deer (Cervus elaphus) increases individual bacterial microbiota diversity but lowers abundance of important gut symbionts. Anim Microbiome 2024; 6:28. [PMID: 38745212 PMCID: PMC11094858 DOI: 10.1186/s42523-024-00315-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Accepted: 05/09/2024] [Indexed: 05/16/2024] Open
Abstract
The gut microbiome plays a crucial role in the health and well-being of animals. It is especially critical for ruminants that depend on this bacterial community for digesting their food. In this study, we investigated the effects of management conditions and supplemental feeding on the gut bacterial microbiota of red deer (Cervus elaphus) in the Bavarian Forest National Park, Germany. Fecal samples were collected from free-ranging deer, deer within winter enclosures, and deer in permanent enclosures. The samples were analyzed by high-throughput sequencing of the 16 S rRNA gene. The results showed that the gut bacterial microbiota differed in diversity, abundance, and heterogeneity within and between the various management groups. Free-ranging deer exhibited lower alpha diversity compared with deer in enclosures, probably because of the food supplementation available to the animals within the enclosures. Free-living individuals also showed the highest beta diversity, indicating greater variability in foraging grounds and plant species selection. Moreover, free-ranging deer had the lowest abundance of potentially pathogenic bacterial taxa, suggesting a healthier gut microbiome. Winter-gated deer, which spent some time in enclosures, exhibited intermediate characteristics between free-ranging and all-year-gated deer. These findings suggest that the winter enclosure management strategy, including supplementary feeding with processed plants and crops, has a significant impact on the gut microbiome composition of red deer. Overall, this study provides important insights into the effects of management conditions, particularly winter enclosure practices, on the gut microbiome of red deer. Understanding these effects is crucial for assessing the potential health implications of management strategies and highlights the value of microbiota investigations as health marker.
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Affiliation(s)
- Luis Víquez-R
- Institute of Evolutionary Ecology and Conservation Genomics, Ulm University, Ulm, Baden-Württemberg, Germany.
- Department of Biology, Bucknell University, Lewisburg, PA, USA.
| | - Maik Henrich
- Department of National Park Monitoring and Animal Management, Bavarian Forest National Park, Grafenau, Bayern, Germany
- Chair of Wildlife Ecology and Wildlife Management, University of Freiburg, Freiburg, Baden-Württemberg, Germany
| | - Vanessa Riegel
- Institute of Evolutionary Ecology and Conservation Genomics, Ulm University, Ulm, Baden-Württemberg, Germany
| | - Marvin Bader
- Institute of Evolutionary Ecology and Conservation Genomics, Ulm University, Ulm, Baden-Württemberg, Germany
- Albert-Ludwigs University, Freiburg, Baden-Württemberg, Germany
| | - Kerstin Wilhelm
- Institute of Evolutionary Ecology and Conservation Genomics, Ulm University, Ulm, Baden-Württemberg, Germany
| | - Marco Heurich
- Department of National Park Monitoring and Animal Management, Bavarian Forest National Park, Grafenau, Bayern, Germany
- Chair of Wildlife Ecology and Wildlife Management, University of Freiburg, Freiburg, Baden-Württemberg, Germany
- Institute for Forest and Wildlife Management, Inland Norway University of Applied Sciences, Koppang, NO-34, Norway
| | - Simone Sommer
- Institute of Evolutionary Ecology and Conservation Genomics, Ulm University, Ulm, Baden-Württemberg, Germany.
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Houston S, Gomez A, Geppert A, Goodyear MC, Cameron CE. In-Depth Proteome Coverage of In Vitro-Cultured Treponema pallidum and Quantitative Comparison Analyses with In Vivo-Grown Treponemes. J Proteome Res 2024; 23:1725-1743. [PMID: 38636938 PMCID: PMC11077495 DOI: 10.1021/acs.jproteome.3c00891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 03/14/2024] [Accepted: 03/22/2024] [Indexed: 04/20/2024]
Abstract
Previous mass spectrometry (MS)-based global proteomics studies have detected a combined total of 86% of all Treponema pallidum proteins under infection conditions (in vivo-grown T. pallidum). Recently, a method was developed for the long-term culture of T. pallidum under in vitro conditions (in vitro-cultured T. pallidum). Herein, we used our previously reported optimized MS-based proteomics approach to characterize the T. pallidum global protein expression profile under in vitro culture conditions. These analyses provided a proteome coverage of 94%, which extends the combined T. pallidum proteome coverage from the previously reported 86% to a new combined total of 95%. This study provides a more complete understanding of the protein repertoire of T. pallidum. Further, comparison of the in vitro-expressed proteome with the previously determined in vivo-expressed proteome identifies only a few proteomic changes between the two growth conditions, reinforcing the suitability of in vitro-cultured T. pallidum as an alternative to rabbit-based treponemal growth. The MS proteomics data have been deposited in the MassIVE repository with the data set identifier MSV000093603 (ProteomeXchange identifier PXD047625).
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Affiliation(s)
- Simon Houston
- Department
of Biochemistry and Microbiology, University
of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - Alloysius Gomez
- Department
of Biochemistry and Microbiology, University
of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - Andrew Geppert
- Department
of Biochemistry and Microbiology, University
of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - Mara C. Goodyear
- Department
of Biochemistry and Microbiology, University
of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - Caroline E. Cameron
- Department
of Biochemistry and Microbiology, University
of Victoria, Victoria, British Columbia V8P 5C2, Canada
- Department
of Medicine, Division of Allergy and Infectious Diseases, University of Washington, Seattle, Washington 98195, United States
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Wu MY, Chen L, Liu LC, Liu MJ, Li YF, Zheng HY, Leng L, Zou YJ, Chen WJ, Li J. Using circulating microbial cell-free DNA to identify persistent Treponema pallidum infection in serofast syphilis patients. iScience 2024; 27:109399. [PMID: 38523794 PMCID: PMC10959656 DOI: 10.1016/j.isci.2024.109399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 01/06/2024] [Accepted: 02/28/2024] [Indexed: 03/26/2024] Open
Abstract
The question of whether serofast status of syphilis patients indicates an ongoing low-grade Treponema pallidum (T. pallidum) infection remains unanswered. To address this, we developed a machine learning model to identify T. pallidum in cell-free DNA (cfDNA) using next-generation sequencing (NGS). Our findings showed that a TP_rate cut-off of 0.033 demonstrated superior diagnostic performance for syphilis, with a specificity of 92.3% and a sensitivity of 71.4% (AUROC = 0.92). This diagnosis model predicted that 20 out of 92 serofast patients had a persistent low-level infection. Based on these predictions, re-treatment was administered to these patients and its efficacy was evaluated. The results showed a statistically significant decrease in RPR titers in the prediction-positive group compared to the prediction-negative group after re-treatment (p < 0.05). These findings provide evidence for the existence of T. pallidum under serofast status and support the use of intensive treatment for serofast patients at higher risk in clinical practice.
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Affiliation(s)
- Meng Yin Wu
- Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
| | - Lu Chen
- Beijing Macro & Micro-test Bio-Tech Co., Ltd, Beijing 100083, China
| | - Li Cheng Liu
- Beijing Macro & Micro-test Bio-Tech Co., Ltd, Beijing 100083, China
| | - Ming Juan Liu
- Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
| | - Yan Feng Li
- Department of Neurology, Peking Union Medical College Hospital, Beijing 100730, China
| | - He Yi Zheng
- Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
| | - Ling Leng
- State Key Laboratory of Complex Severe and Rare Diseases, Translational Medicine Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
| | - Yi Jun Zou
- College of Life Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei Jun Chen
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jun Li
- Department of Dermatology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100730, China
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Nieuwenburg SA, Jongen VW, Schim van der Loeff M, de Vries H, van Dam A. Seroconversion in syphilis screening without positive confirmatory tests points at early infection. Sex Transm Infect 2024; 100:138-142. [PMID: 38253515 DOI: 10.1136/sextrans-2023-055973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Accepted: 12/02/2023] [Indexed: 01/24/2024] Open
Abstract
INTRODUCTION The chemiluminescence immunoassay (CLIA) is a widely used screening test for syphilis. A CLIA seroconversion in the absence of a positive line immunoassay (LIA) or rapid plasma reagin (RPR) could indicate either an early incubating syphilis or a false positive result. We aimed to evaluate the diagnostic value of such seroconversions. METHODS We retrospectively analysed data of clients visiting the Centre for Sexual Health Amsterdam between July 2013 and August 2021 with a positive CLIA and a negative RPR and negative or indeterminate LIA (at time To), and a preceding visit (T-1) with a negative CLIA <6 months of To ('unconfirmed CLIA seroconversion'). If available, data of follow-up visits (T1) <2 months of To were also included. A syphilis diagnosis was confirmed if darkfield microscopy or PCR for Treponema pallidum was positive at T0 or T1, or if RPR and/or LIA were positive at T1. RESULTS We included data of 107 clients with unconfirmed CLIA seroconversion. The value of CLIA seroconversion could not be established in 13 (12.1%) clients. In the remaining 94 clients, the unconfirmed CLIA seroconversion was confirmed as early syphilis in 72 (76.6%) clients and probable syphilis in 6 (6.4%) clients. In 16 (17.0%) clients, the unconfirmed CLIA seroconversion was regarded as a false positive reaction of whom 4 (5.3%) clients had a seroreversion of the CLIA at T1. CONCLUSION The majority of unconfirmed CLIA seroconversions represented early syphilis infections. Therefore, additional T. pallidum PCR, a follow-up consultation or early treatment is recommended.
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Affiliation(s)
- Silvia Achia Nieuwenburg
- Department of Infectious Diseases, Public Health Service Amsterdam, Amsterdam, the Netherlands
- Amsterdam UMC location University of Amsterdam, Amsterdam Institute for Infection and Immunity, Meibergdreef 9, Amsterdam, the Netherlands
| | - Vita Willemijn Jongen
- Department of Infectious Diseases, Public Health Service Amsterdam, Amsterdam, the Netherlands
- Stichting HIV Monitoring, Amsterdam, the Netherlands
| | - Maarten Schim van der Loeff
- Department of Infectious Diseases, Public Health Service Amsterdam, Amsterdam, the Netherlands
- Amsterdam UMC location University of Amsterdam, Amsterdam Institute for Infection and Immunity, Meibergdreef 9, Amsterdam, the Netherlands
- Amsterdam UMC location University of Amsterdam, Department of Internal Medicine, Division of Infectious Diseases, Amsterdam, Meibergdreef 9, Amsterdam, the Netherlands
| | - Henry de Vries
- Department of Infectious Diseases, Public Health Service Amsterdam, Amsterdam, the Netherlands
- Amsterdam UMC location University of Amsterdam, Amsterdam Institute for Infection and Immunity, Meibergdreef 9, Amsterdam, the Netherlands
- Amsterdam UMC location University of Amsterdam, Department of Dermatology, Meibergdreef 9, Amsterdam, Amsterdam UMC location University of Amsterdam, Department of Dermatology, the Netherlands
| | - Alje van Dam
- Department of Infectious Diseases, Public Health Service Amsterdam, Amsterdam, the Netherlands
- Amsterdam UMC location University of Amsterdam, Department of Medical Microbiology, Amsterdam Health Service, Mebergdreef 9, Amsterdam, the Netherlands
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10
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Xie Q, Tang Y, Shen L, Yang D, Zhang J, Luo Q. Immunophenotypic variations in syphilis: insights from Mendelian randomization analysis. Front Immunol 2024; 15:1380720. [PMID: 38694502 PMCID: PMC11061532 DOI: 10.3389/fimmu.2024.1380720] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Accepted: 04/04/2024] [Indexed: 05/04/2024] Open
Abstract
Background Infection with Treponema pallidum instigates complex immune responses. Prior research has suggested that persistent Treponema pallidum infection can manipulate host immune responses and circumvent host defenses. However, the precise role of immune cells in Treponema pallidum infection across different stages remains a contentious issue. Methods Utilizing summary data from genome-wide association studies, we employed a two-sample Mendelian randomization method to investigate the association between 731 immunophenotypes and syphilis. Syphilis was categorized into early and late stages in this study to establish a more robust correlation and minimize bias in database sources. Results Our findings revealed that 33, 36, and 27 immunophenotypes of peripheral blood were associated with syphilis (regardless of disease stage), early syphilis and late syphilis, respectively. Subsequent analysis demonstrated significant variations between early and late syphilis in terms of immunophenotypes. Specifically, early syphilis showcased activated, secreting, and resting regulatory T cells, whereas late syphilis was characterized by resting Treg cells. More B cells subtypes emerged in late syphilis. Monocytes in early syphilis exhibited an intermediate and non-classical phenotype, transitioning to classical in late syphilis. Early syphilis featured naive T cells, effector memory T cells, and terminally differentiated T cells, while late syphilis predominantly presented terminally differentiated T cells. Immature myeloid-derived suppressor cells were evident in early syphilis, whereas the dendritic cell immunophenotype was exclusive to late syphilis. Conclusion Multiple immunophenotypes demonstrated associations with syphilis, showcasing substantial disparities between the early and late stages of the disease. These findings hold promise for informing immunologically oriented treatment strategies, paving the way for more effective and efficient syphilis interventions.
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Affiliation(s)
| | | | | | | | | | - Qingqiong Luo
- Department of Clinical Laboratory Medicine, Shanghai Skin Disease Hospital, School of Medicine, Tongji University, Shanghai, China
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11
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Li J, Ma J, Liu M, Li M, Zhang M, Yin W, Wu M, Li X, Zhang Q, Zhang H, Zheng H, Mao C, Sun J, Wang W, Lyu W, Yue X, Weng W, Li J, Chen F, Zhu Y, Leng L. Large-Scale Proteome Profiling Identifies Biomarkers Associated with Suspected Neurosyphilis Diagnosis. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2307744. [PMID: 38380496 DOI: 10.1002/advs.202307744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Revised: 02/01/2024] [Indexed: 02/22/2024]
Abstract
Neurosyphilis (NS) is a central nervous system (CNS) infection caused by Treponema pallidum (T. pallidum). NS can occur at any stage of syphilis and manifests as a broad spectrum of clinical symptoms. Often referred to as "the great imitator," NS can be easily overlooked or misdiagnosed due to the absence of standard diagnostic tests, potentially leading to severe and irreversible organ dysfunction. In this study, proteomic and machine learning model techniques are used to characterize 223 cerebrospinal fluid (CSF) samples to identify diagnostic markers of NS and provide insights into the underlying mechanisms of the associated inflammatory responses. Three biomarkers (SEMA7A, SERPINA3, and ITIH4) are validated as contributors to NS diagnosis through multicenter verification of an additional 115 CSF samples. We anticipate that the identified biomarkers will become effective tools for assisting in diagnosis of NS. Our insights into NS pathogenesis in brain tissue may inform therapeutic strategies and drug discoveries for NS patients.
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Affiliation(s)
- Jun Li
- Department of Dermatology, Institute of Clinical Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, 100730, China
- Stem cell and Regenerative Medicine Lab, Department of Medical Science Research Center, Institute of Clinical Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Translational Medicine Center, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, 100730, China
| | - Jie Ma
- State Key Laboratory of Medical Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, 102206, China
| | - MingJuan Liu
- Department of Dermatology, Institute of Clinical Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, 100730, China
| | - Mansheng Li
- State Key Laboratory of Medical Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, 102206, China
| | - Ming Zhang
- Department of Dermatology, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China
| | - Wenhao Yin
- The First Hospital of Jiaxing, The Affiliated Hospital of Jiaxing University, Zhejiang, 314001, China
| | - Mengyin Wu
- Department of Dermatology, Institute of Clinical Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, 100730, China
| | - Xiao Li
- State Key Laboratory of Medical Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, 102206, China
| | - Qiyu Zhang
- Department of Dermatology, Institute of Clinical Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, 100730, China
- Stem cell and Regenerative Medicine Lab, Department of Medical Science Research Center, Institute of Clinical Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Translational Medicine Center, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, 100730, China
| | - Hanlin Zhang
- Department of Dermatology, Institute of Clinical Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, 100730, China
| | - Heyi Zheng
- Department of Dermatology, Institute of Clinical Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, National Clinical Research Center for Dermatologic and Immunologic Diseases, Beijing, 100730, China
| | - Chenhui Mao
- Department of Neurology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Science, Beijing, 100730, China
| | - Jian Sun
- Department of Pathology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China
| | - Wenze Wang
- Department of Pathology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China
| | - Wei Lyu
- Department of Infectious Disease, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, 100730, China
| | - Xueping Yue
- Department of Dermatology and Venereology, Beijing Tiantan Hospital, Capital Medical University, Beijing, 100050, China
| | - Wenjia Weng
- Department of Dermatology, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China
| | - Juan Li
- Department of Dermatology, Beijing Youan Hospital, Capital Medical University, Beijing, 100069, China
| | - Fengxin Chen
- Infections Disease Center, Beijing Ditan Hospital, Capital Medical University, Beijing, 100102, China
| | - Yunping Zhu
- State Key Laboratory of Medical Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences (Beijing), Beijing Institute of Lifeomics, Beijing, 102206, China
- Basic Medical School, Anhui Medical University, Anhui, 230032, China
| | - Ling Leng
- Stem cell and Regenerative Medicine Lab, Department of Medical Science Research Center, Institute of Clinical Medicine, State Key Laboratory of Complex Severe and Rare Diseases, Translational Medicine Center, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, 100730, China
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12
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Adhikari EH. Update on syphilis in pregnancy: marrying basic science advances and clinical perseverance to solve an ancient public health problem. Curr Opin Obstet Gynecol 2024; 36:67-74. [PMID: 38205786 DOI: 10.1097/gco.0000000000000939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2024]
Abstract
PURPOSE OF REVIEW While the clinical disease of syphilis, its consequences in pregnancy, and its sensitivity to penicillin treatment have remained relatively unchanged for a century or more, new technologies and basic discoveries in syphilis research have translated into tangible advances in clinical diagnosis, treatment, and prevention. The purpose of this review is to help the reader understand some of the recent relevant scientific publications on syphilis and its causative organism in a clinical obstetric context. RECENT FINDINGS Rates of adult and congenital syphilis have risen dramatically in the last decade despite public health efforts. Penicillin shortages and lack of screening or adequate treatment have all contributed to global disease burden. Advances in genomic and microbiological characterization of this spirochete have led to new developments in serologic and molecular diagnosis as well as evaluation of potential vaccine candidates. Until a syphilis vaccine is available, substance use disorders and lack of screening in pregnancy are associated with increased congenital syphilis, and these challenges will require novel solutions to fully address this public health crisis. SUMMARY Addressing the burden of congenital syphilis demands that obstetricians stay well informed of new tools and resources for diagnosis, treatment, and prevention of syphilis now and in the future.
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Affiliation(s)
- Emily H Adhikari
- Department of Obstetrics and Gynecology, Division of Maternal-Fetal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, USA
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13
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Majander K, Pla-Díaz M, du Plessis L, Arora N, Filippini J, Pezo-Lanfranco L, Eggers S, González-Candelas F, Schuenemann VJ. Redefining the treponemal history through pre-Columbian genomes from Brazil. Nature 2024; 627:182-188. [PMID: 38267579 PMCID: PMC10917687 DOI: 10.1038/s41586-023-06965-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 12/12/2023] [Indexed: 01/26/2024]
Abstract
The origins of treponemal diseases have long remained unknown, especially considering the sudden onset of the first syphilis epidemic in the late 15th century in Europe and its hypothesized arrival from the Americas with Columbus' expeditions1,2. Recently, ancient DNA evidence has revealed various treponemal infections circulating in early modern Europe and colonial-era Mexico3-6. However, there has been to our knowledge no genomic evidence of treponematosis recovered from either the Americas or the Old World that can be reliably dated to the time before the first trans-Atlantic contacts. Here, we present treponemal genomes from nearly 2,000-year-old human remains from Brazil. We reconstruct four ancient genomes of a prehistoric treponemal pathogen, most closely related to the bejel-causing agent Treponema pallidum endemicum. Contradicting the modern day geographical niche of bejel in the arid regions of the world, the results call into question the previous palaeopathological characterization of treponeme subspecies and showcase their adaptive potential. A high-coverage genome is used to improve molecular clock date estimations, placing the divergence of modern T. pallidum subspecies firmly in pre-Columbian times. Overall, our study demonstrates the opportunities within archaeogenetics to uncover key events in pathogen evolution and emergence, paving the way to new hypotheses on the origin and spread of treponematoses.
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Affiliation(s)
- Kerttu Majander
- Institute of Evolutionary Medicine, University of Zurich, Zurich, Switzerland.
- Department of Evolutionary Anthropology, University of Vienna, Vienna, Austria.
- Department of Environmental Sciences, University of Basel, Basel, Switzerland.
| | - Marta Pla-Díaz
- Unidad Mixta Infección y Salud Pública, FISABIO/Universidad de Valencia-I2SysBio, Valencia, Spain
- CIBER in Epidemiology and Public Health, Instituto de Salud Carlos III, Madrid, Spain
| | - Louis du Plessis
- Department of Biosystems Science and Engineering, ETH Zürich, Basel, Switzerland
- Swiss Institute of Bioinformatics, Quartier Sorge, Lausanne, Switzerland
| | - Natasha Arora
- Zurich Institute of Forensic Medicine, University of Zurich, Zurich, Switzerland
| | - Jose Filippini
- Department of Genetic and Evolutionary Biology, University of São Paulo, São Paulo, Brazil
| | - Luis Pezo-Lanfranco
- Department of Genetic and Evolutionary Biology, University of São Paulo, São Paulo, Brazil
- Institute of Environmental Science and Technology (ICTA) and Prehistory Department, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Sabine Eggers
- Department of Genetic and Evolutionary Biology, University of São Paulo, São Paulo, Brazil
- Department of Anthropology, Natural History Museum Vienna, Vienna, Austria
| | - Fernando González-Candelas
- Unidad Mixta Infección y Salud Pública, FISABIO/Universidad de Valencia-I2SysBio, Valencia, Spain.
- CIBER in Epidemiology and Public Health, Instituto de Salud Carlos III, Madrid, Spain.
| | - Verena J Schuenemann
- Institute of Evolutionary Medicine, University of Zurich, Zurich, Switzerland.
- Department of Evolutionary Anthropology, University of Vienna, Vienna, Austria.
- Department of Environmental Sciences, University of Basel, Basel, Switzerland.
- Human Evolution and Archaeological Sciences (HEAS), University of Vienna, Vienna, Austria.
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14
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Reid TB, Godornes C, Campbell VL, Laing KJ, Tantalo LC, Gomez A, Pholsena TN, Lieberman NAP, Krause TM, Cegielski VI, Culver LA, Nguyen N, Tong DQ, Hawley KL, Greninger AL, Giacani L, Cameron CE, Dombrowski JC, Wald A, Koelle DM. Treponema pallidum periplasmic and membrane proteins are recognized by circulating and skin CD4+ T cells. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.27.581790. [PMID: 38464313 PMCID: PMC10925203 DOI: 10.1101/2024.02.27.581790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Background Histologic and serologic studies suggest the induction of local and systemic Treponema pallidum ( Tp )-specific CD4+ T cell responses to Tp infection. We hypothesized that Tp -specific CD4+ T cells are detectable in blood and in the skin rash of secondary syphilis and persist in both compartments after treatment. Methods PBMC collected from 67 participants were screened by IFNγ ELISPOT response to Tp sonicate. Tp -reactive T cell lines from blood and skin were probed for responses to 88 recombinant Tp antigens. Peptide epitopes and HLA class II restriction were defined for selected antigens. Results We detected CD4+ T cell responses to Tp sonicate ex vivo. Using Tp -reactive T cell lines we observed recognition of 14 discrete proteins, 13 of which localize to bacterial membranes or the periplasmic space. After therapy, Tp -specific T cells persisted for at least 6 months in skin and 10 years in blood. Conclusions Tp infection elicits an antigen-specific CD4+ T cell response in blood and skin. Tp -specific CD4+ T cells persist as memory in both compartments long after curative therapy. The Tp antigenic targets we identified may be high priority vaccine candidates.
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15
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Zhai L, Bonds AC, Smith CA, Oo H, Chou JCC, Welander PV, Dassama LMK. Novel sterol binding domains in bacteria. eLife 2024; 12:RP90696. [PMID: 38329015 PMCID: PMC10942540 DOI: 10.7554/elife.90696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2024] Open
Abstract
Sterol lipids are widely present in eukaryotes and play essential roles in signaling and modulating membrane fluidity. Although rare, some bacteria also produce sterols, but their function in bacteria is not known. Moreover, many more species, including pathogens and commensal microbes, acquire or modify sterols from eukaryotic hosts through poorly understood molecular mechanisms. The aerobic methanotroph Methylococcus capsulatus was the first bacterium shown to synthesize sterols, producing a mixture of C-4 methylated sterols that are distinct from those observed in eukaryotes. C-4 methylated sterols are synthesized in the cytosol and localized to the outer membrane, suggesting that a bacterial sterol transport machinery exists. Until now, the identity of such machinery remained a mystery. In this study, we identified three novel proteins that may be the first examples of transporters for bacterial sterol lipids. The proteins, which all belong to well-studied families of bacterial metabolite transporters, are predicted to reside in the inner membrane, periplasm, and outer membrane of M. capsulatus, and may work as a conduit to move modified sterols to the outer membrane. Quantitative analysis of ligand binding revealed their remarkable specificity for 4-methylsterols, and crystallographic structures coupled with docking and molecular dynamics simulations revealed the structural bases for substrate binding by two of the putative transporters. Their striking structural divergence from eukaryotic sterol transporters signals that they form a distinct sterol transport system within the bacterial domain. Finally, bioinformatics revealed the widespread presence of similar transporters in bacterial genomes, including in some pathogens that use host sterol lipids to construct their cell envelopes. The unique folds of these bacterial sterol binding proteins should now guide the discovery of other proteins that handle this essential metabolite.
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Affiliation(s)
- Liting Zhai
- Department of Chemistry and Sarafan ChEM-H, Stanford UniversityStanfordUnited States
| | - Amber C Bonds
- Department of Earth System Science, Stanford UniversityStanfordUnited States
| | - Clyde A Smith
- Department of Chemistry and Stanford Synchrotron Radiation Lightsource, Stanford UniversityStanfordUnited States
| | - Hannah Oo
- Department of Chemistry and Sarafan ChEM-H, Stanford UniversityStanfordUnited States
| | | | - Paula V Welander
- Department of Earth System Science, Stanford UniversityStanfordUnited States
| | - Laura MK Dassama
- Department of Chemistry and Sarafan ChEM-H, Stanford UniversityStanfordUnited States
- Department of Microbiology and Immunology, Stanford University School of MedicineStanfordUnited States
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16
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Papp JR, Park IU, Fakile Y, Pereira L, Pillay A, Bolan GA. CDC Laboratory Recommendations for Syphilis Testing, United States, 2024. MMWR Recomm Rep 2024; 73:1-32. [PMID: 38319847 PMCID: PMC10849099 DOI: 10.15585/mmwr.rr7301a1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2024] Open
Abstract
This report provides new CDC recommendations for tests that can support a diagnosis of syphilis, including serologic testing and methods for the identification of the causative agent Treponema pallidum. These comprehensive recommendations are the first published by CDC on laboratory testing for syphilis, which has traditionally been based on serologic algorithms to detect a humoral immune response to T. pallidum. These tests can be divided into nontreponemal and treponemal tests depending on whether they detect antibodies that are broadly reactive to lipoidal antigens shared by both host and T. pallidum or antibodies specific to T. pallidum, respectively. Both types of tests must be used in conjunction to help distinguish between an untreated infection or a past infection that has been successfully treated. Newer serologic tests allow for laboratory automation but must be used in an algorithm, which also can involve older manual serologic tests. Direct detection of T. pallidum continues to evolve from microscopic examination of material from lesions for visualization of T. pallidum to molecular detection of the organism. Limited point-of-care tests for syphilis are available in the United States; increased availability of point-of-care tests that are sensitive and specific could facilitate expansion of screening programs and reduce the time from test result to treatment. These recommendations are intended for use by clinical laboratory directors, laboratory staff, clinicians, and disease control personnel who must choose among the multiple available testing methods, establish standard operating procedures for collecting and processing specimens, interpret test results for laboratory reporting, and counsel and treat patients. Future revisions to these recommendations will be based on new research or technologic advancements for syphilis clinical laboratory science.
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17
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Zhang X, Duan J, Wang Y, Xie B, Zhou J, Zhao S, Yin W, Liu P, Zhao F. Insight into the invasion process and immune-protective evaluation of Tp0971, a membrane lipoprotein from Treponema pallidum. Microbiol Spectr 2023; 11:e0004723. [PMID: 37855609 PMCID: PMC10714829 DOI: 10.1128/spectrum.00047-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 09/01/2023] [Indexed: 10/20/2023] Open
Abstract
IMPORTANCE The past two decades have seen a worldwide resurgence in infections caused by Treponema pallidum (T. pallidum) subsp. pallidum, the syphilis spirochete. The well-recognized capacity of the syphilis spirochete for early dissemination and immune evasion has earned it the designation "the stealth pathogen." There are many hurdles to studying syphilis pathogenesis, most notably the difficulty of culturing and genetically manipulating T. pallidum, as well as the absence of an effective vaccine for T. pallidum prevention. T. pallidum infection in humans is a complex and lengthy process. In this study, we investigated the invasion process and the function of the infection-dependent antigen Tp0971 as an immunogen to inhibit the dissemination of T. pallidum in an animal infection model. This enables a better understanding of the specific pathogenic mechanism of this pathogen, syphilis pathogenesis, and vaccine research.
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Affiliation(s)
- Xiaohong Zhang
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Department of Clinical Laboratory Medicine of the First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Junxia Duan
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Department of Clinical Laboratory Medicine of the First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Yali Wang
- Department of Clinical Medicine Undergraduate, Hengyang Medical College, University of South China, Hengyang, China
| | - Bibo Xie
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Department of Clinical Laboratory Medicine of the First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Jie Zhou
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Department of Clinical Laboratory Medicine of the First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Sisi Zhao
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Department of Clinical Laboratory Medicine of the First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Weiguo Yin
- Laboratory Department, Qingyuan People’s Hospital, Qingyuan, China
| | - Peng Liu
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Department of Clinical Laboratory Medicine of the First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
| | - Feijun Zhao
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan Province, Department of Clinical Laboratory Medicine of the First Affiliated Hospital, Hengyang Medical College, University of South China, Hengyang, China
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18
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Li W, Yuan W, Huang S, Zou L, Zheng K, Xie D. Research progress on the mechanism of Treponema pallidum breaking through placental barrier. Microb Pathog 2023; 185:106392. [PMID: 37852552 DOI: 10.1016/j.micpath.2023.106392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/12/2023] [Accepted: 10/12/2023] [Indexed: 10/20/2023]
Abstract
Congenital syphilis, a significant cause of fetal mortality worldwide, is a congenital infectious disease instigated by the vertical transmission of Treponema pallidum during pregnancy. Clinical manifestations include preterm delivery, stillbirth, neonatal skin lesions, skeletal abnormalities, and central nervous system aberrations. The ongoing increase in the incidence of congenital syphilis, coupled with complexities in diagnosis, necessitates a detailed understanding of its pathogenesis for the development of improved diagnostic approaches, and to interrupt the route of vertical transmission. Drawing from the broader body of research associated with vertical transmission pathogens, we aim to clarify the potential mechanisms by which Treponema pallidum breaches the placental barrier to infect the fetus.
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Affiliation(s)
- Weiwei Li
- Department of Clinical Laboratory, The Second People's Hospital of Foshan, China
| | - Wei Yuan
- The Fourth Affiliated Hospital of Nanchang University, China
| | - Shaobin Huang
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Lin Zou
- Department of Clinical Laboratory, The Second People's Hospital of Foshan, China
| | - Kang Zheng
- Department of Clinical Laboratory, Hengyang Central Hospital, Hengyang, China.
| | - Dongde Xie
- Department of Clinical Laboratory, The Second People's Hospital of Foshan, China.
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19
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Lynch MJ, Deshpande M, Kurniyati K, Zhang K, James M, Miller M, Zhang S, Passalia FJ, Wunder EA, Charon NW, Li C, Crane BR. Lysinoalanine cross-linking is a conserved post-translational modification in the spirochete flagellar hook. PNAS NEXUS 2023; 2:pgad349. [PMID: 38047041 PMCID: PMC10691653 DOI: 10.1093/pnasnexus/pgad349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2023] [Accepted: 10/17/2023] [Indexed: 12/05/2023]
Abstract
Spirochetes cause Lyme disease, leptospirosis, syphilis, and several other human illnesses. Unlike other bacteria, spirochete flagella are enclosed within the periplasmic space where the filaments distort and push the cell body by the action of the flagellar motors. We previously demonstrated that the oral pathogen Treponema denticola (Td) and Lyme disease pathogen Borreliella burgdorferi (Bb) form covalent lysinoalanine (Lal) cross-links between conserved cysteine and lysine residues of the FlgE protein that composes the flagellar hook. In Td, Lal is unnecessary for hook assembly but is required for motility, presumably due to the stabilizing effect of the cross-link. Herein, we extend these findings to other, representative spirochete species across the phylum. We confirm the presence of Lal cross-linked peptides in recombinant and in vivo-derived samples from Treponema spp., Borreliella spp., Brachyspira spp., and Leptospira spp. As was observed with Td, a mutant strain of Bb unable to form the cross-link has greatly impaired motility. FlgE from Leptospira spp. does not conserve the Lal-forming cysteine residue which is instead substituted by serine. Nevertheless, Leptospira interrogans FlgE also forms Lal, with several different Lal isoforms being detected between Ser-179 and Lys-145, Lys-148, and Lys-166, thereby highlighting species or order-specific differences within the phylum. Our data reveal that the Lal cross-link is a conserved and necessary posttranslational modification across the spirochete phylum and may thus represent an effective target for the development of spirochete-specific antimicrobials.
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Affiliation(s)
- Michael J Lynch
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA
| | - Maithili Deshpande
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA
| | - Kurni Kurniyati
- Philips Institute for Oral Health Research, Virginia Commonwealth University School of Dentistry, Richmond, VA 23298, USA
| | - Kai Zhang
- Philips Institute for Oral Health Research, Virginia Commonwealth University School of Dentistry, Richmond, VA 23298, USA
| | - Milinda James
- Department of Microbiology, Immunology, and Cell Biology, Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV 26505, USA
| | - Michael Miller
- Department of Biochemistry, Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV 26505, USA
| | - Sheng Zhang
- Proteomics and Metabolomics Facility, Institute of Biotechnology, Cornell University, Ithaca, NY 14853, USA
| | - Felipe J Passalia
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA
| | - Elsio A Wunder
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT 06510, USA
- Department of Pathobiology and Veterinary Science, University of Connecticut, Storrs, CT 06269, USA
| | - Nyles W Charon
- Department of Microbiology, Immunology, and Cell Biology, Robert C. Byrd Health Sciences Center, West Virginia University, Morgantown, WV 26505, USA
| | - Chunhao Li
- Philips Institute for Oral Health Research, Virginia Commonwealth University School of Dentistry, Richmond, VA 23298, USA
| | - Brian R Crane
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA
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Zhang Y, Wang K, Zhu J, Wu J. A network suspected infectious disease model for the development of syphilis transmission from 2015 to 2021 in Hubei province, China. J Appl Microbiol 2023; 134:lxad311. [PMID: 38130214 DOI: 10.1093/jambio/lxad311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Revised: 12/10/2023] [Accepted: 12/20/2023] [Indexed: 12/23/2023]
Abstract
AIMS Understanding the transmission mode of syphilis is essential to prevent and predict its future prevalence and to develop effective control measures. This study aimed to develop a network suspected infectious disease model to simulate the syphilis transmission. METHODS AND RESULTS The number of syphilis cases in Wuhan's Fourth Hospital, Hubei province, China, from October 2015 to July 2021 was collected. The simulation was carried out by interpersonal network-SI (suspected infectious) model based on temporal exponential family random graph models. Late latent syphilis and tertiary syphilis are predicted by December 2025. The validity of simulated value and real data was tested, including determination coefficient (R2), root means square error (RMSE), and means relative error (MRE). Moreover, we developed an online app that can more easily predict the number of syphilis infections in different scenarios by setting different parameters. Results showed that R2, RMSE, and MRE were 0.995, 36.19, and 6.31, respectively. Speed from latent infection to primary syphilis, primary syphilis to secondary syphilis, and susceptible group to latent infection decreased rapidly. The speed of transformation from secondary syphilis to early incubation period and early latent to late latent experienced a process from increase to decreased. Late latent to tertiary syphilis patients increased steadily. The number of late latent patients, early latent, invisible infection, primary syphilis, and secondary syphilis all increased at first and turn to decreased. However, tertiary syphilis continuously kept rising in the whole process. To better make use of the transmission model, an online application was developed (https://alanwu.shinyapps.io/MD-shiny/). CONCLUSIONS Based on the simulation that late latent and tertiary syphilis were steadily increasing, the prevention and treatment for syphilis were imperative.
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Affiliation(s)
- Yue Zhang
- School of Public Health, Department of Epidemiology, Shanxi Medical University, Key Laboratory of Coal Environmental Pathogenicity and Prevention, Ministry Education, Taiyuan 030001, China
| | - Kai Wang
- Department of Public Health, Wuhan Fourth Hospital, Wuhan 430000, China
| | - Junjie Zhu
- Department of Epidemiology and Health Statistics, School of Public Health, Dali University, Dali 671000, China
| | - Jinyi Wu
- Department of Public Health, Wuhan Fourth Hospital, Wuhan 430000, China
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21
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Li W, Li S, Wang J, Yu M, Yang H, He Z, Tang Y, Liu J, Guo N, Xie D, Liu Z, Zheng K, Xu M, Wu Y. The outer membrane protein Tp92 of Treponema pallidum delays human neutrophil apoptosis via the ERK, PI3K/Akt, and NF-κB pathways. Mol Microbiol 2023; 120:684-701. [PMID: 37718557 DOI: 10.1111/mmi.15164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2023] [Revised: 09/01/2023] [Accepted: 09/03/2023] [Indexed: 09/19/2023]
Abstract
Syphilis is a persistent sexually transmitted disease caused by infiltration of the elusive pathogen Treponema pallidum. Despite the prevalence of human polymorphonuclear neutrophils (hPMNs) within cutaneous lesions, which are characteristic of incipient syphilis, their role in T. pallidum infection remains unclear. Tp92 is the only T. pallidum helical outer membrane protein that exhibits structural features similar to those of outer membrane proteins in other gram-negative bacteria. However, the functional mechanism of this protein in immune cells remains unclear. Neutrophils are short-lived cells that undergo innate apoptosis in response to external stimuli that typically influence this process. In this study, we determined that Tp92 impedes the activation of procaspase-3 via the ERK MAPK, PI3K/Akt, and NF-κB signaling pathways, consequently suppressing caspase-3 activity within hPMNs, and thereby preventing hPMNs apoptosis. Furthermore, Tp92 could also modulate hPMNs apoptosis by enhancing the expression of the anti-apoptotic protein Mcl-1, stimulating IL-8 secretion, and preserving the mitochondrial membrane potential. These findings provide valuable insights into the molecular mechanisms underlying T. pallidum infection and suggest potential therapeutic targets for syphilis treatment.
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Affiliation(s)
- Weiwei Li
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
- Department of Clinical Laboratory, The Second People's Hospital of Foshan, Foshan, China
| | - Sijia Li
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Jianye Wang
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
- Key Laboratory of Immune Microenvironment and Disease of the Ministry of Education, Department of Immunology, School of Basic Medical Sciences, Tianjin Medical University, Tianjin, China
| | - Maoying Yu
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Hongyu Yang
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Zhangping He
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Yuanyuan Tang
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Jie Liu
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Ningyuan Guo
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Dongde Xie
- Department of Clinical Laboratory, The Second People's Hospital of Foshan, Foshan, China
| | - Zhaoping Liu
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Kang Zheng
- Department of Clinical Laboratory, Hengyang Central Hospital, Hengyang, China
| | - Man Xu
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Yimou Wu
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
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22
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Jun T, Zhimin L, Xi D, Hua W, Huilong S, Jiaofeng P, Kang Z, Xie Q. Immunisation with the glycolytic enzyme enolase inhibits dissemination of Treponema pallidum in C57BL/6 mice. Microb Pathog 2023; 184:106374. [PMID: 37802159 DOI: 10.1016/j.micpath.2023.106374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 09/21/2023] [Accepted: 09/22/2023] [Indexed: 10/08/2023]
Abstract
Treponema pallidum (T. pallidum), an obligate extracellular bacterium, is the causative agent of sexually transmitted bacterial diseases. In this study, the glycolytic enzyme enolase (Tp Eno) of T. pallidum were injected intramuscularly into C57BL/6 mice, resulting in higher levels of specific anti-Tp Eno antibodies and Tp Eno-specific splenocyte proliferation than those in the mice immunized with recombinant protein Tp Eno. Cytokine (IL-4, IL-6, IL-10, IFN-γ, and TNF-α) analysis of splenocytes showed that the Tp Eno could slightly trigger the Th1-biased immune response. Furthermore, immunization of mice with Tp Eno elicited a significant production of IFN-γ by CD4+ T-cells in the spleen. Subsequently, mice were inoculated intradermally (between the scapulae), intraperitoneally, intrarectally and via the corpora cavernosa with 2.5 × 106 organisms per site (1 × 107 total organisms). The bacterial organ burden detected in the blood, spleen, liver, testes or brain of immunized mice suggested that Tp Eno enhances protective immunity to inhibit T. pallidum colonization in distal tissues. Therefore, Tp Eno vaccination enhances Tp Eno-specific immunogenicity and provides protection against T. pallidum dissemination.
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Affiliation(s)
- Tang Jun
- Department of Laboratory Medicine, Hunan People's Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, 410000, HuNan, China
| | - Liu Zhimin
- Clinical Laboratory, Affiliated Hengyang Hospital, Southern Medical University (Hengyang Central Hospital), 12# Yancheng Road, Hengyang, 421001, Hunan, China
| | - Deng Xi
- Clinical Laboratory, Affiliated Hengyang Hospital, Southern Medical University (Hengyang Central Hospital), 12# Yancheng Road, Hengyang, 421001, Hunan, China
| | - Wu Hua
- Clinical Laboratory, Affiliated Hengyang Hospital, Southern Medical University (Hengyang Central Hospital), 12# Yancheng Road, Hengyang, 421001, Hunan, China
| | - Shen Huilong
- Clinical Laboratory, Affiliated Hengyang Hospital, Southern Medical University (Hengyang Central Hospital), 12# Yancheng Road, Hengyang, 421001, Hunan, China
| | - Peng Jiaofeng
- Clinical Laboratory, Affiliated Hengyang Hospital, Southern Medical University (Hengyang Central Hospital), 12# Yancheng Road, Hengyang, 421001, Hunan, China
| | - Zheng Kang
- Clinical Laboratory, Affiliated Hengyang Hospital, Southern Medical University (Hengyang Central Hospital), 12# Yancheng Road, Hengyang, 421001, Hunan, China.
| | - Qinghua Xie
- The Affiliated Changsha Central Hospital, Department of Laboratory Medicine, Hengyang Medical School, University of South China, Changsha, 410004, HuNan, China.
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23
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Kędzierska-Mieszkowska S. Sigma factors of RNA polymerase in the pathogenic spirochaete Leptospira interrogans, the causative agent of leptospirosis. FASEB J 2023; 37:e23163. [PMID: 37688587 DOI: 10.1096/fj.202300252rrr] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Revised: 07/13/2023] [Accepted: 08/14/2023] [Indexed: 09/11/2023]
Abstract
The aim of this review is to summarize the current knowledge on the role of σ factors in a highly invasive spirochaete Leptospira interrogans responsible for leptospirosis that affects many mammals, including humans. This disease has a significant impact on public health and the economy worldwide. In bacteria, σ factors are the key regulators of gene expression at the transcriptional level and therefore play an important role in bacterial adaptative response to different environmental stimuli. These factors form a holoenzyme with the RNA polymerase core enzyme and then direct it to specific promoters, which results in turning on selected genes. Most bacteria possess several different σ factors that enable them to maintain basal gene expression, as well as to regulate gene expression in response to specific environmental signals. Recent comparative genomics and in silico genome-wide analyses have revealed that the L. interrogans genome, consisting of two circular chromosomes, encodes a total of 14 σ factors. Among them, there is one putative housekeeping σ70 -like factor, and three types of alternative σ factors, i.e., one σ54 , one σ28 and 11 putative ECF (extracytoplasmic function) σE -type factors. Here, characteristics of these putative σ factors and their possible role in the L. interrogans gene regulation (especially in this pathogen's adaptive response to various environmental conditions, an important determinant of leptospiral virulence), are presented.
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Liu PY, Xia D, McGonigle K, Carroll AB, Chiango J, Scavello H, Martins R, Mehta S, Krespan E, Lunde E, LeVine D, Fellman CL, Goggs R, Beiting DP, Garden OA. Immune-mediated hematological disease in dogs is associated with alterations of the fecal microbiota: a pilot study. Anim Microbiome 2023; 5:46. [PMID: 37770990 PMCID: PMC10540429 DOI: 10.1186/s42523-023-00268-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 09/20/2023] [Indexed: 09/30/2023] Open
Abstract
BACKGROUND The dog is the most popular companion animal and is a valuable large animal model for several human diseases. Canine immune-mediated hematological diseases, including immune-mediated hemolytic anemia (IMHA) and immune thrombocytopenia (ITP), share many features in common with autoimmune hematological diseases of humans. The gut microbiome has been linked to systemic illness, but few studies have evaluated its association with immune-mediated hematological disease. To address this knowledge gap, 16S rRNA gene sequencing was used to profile the fecal microbiota of dogs with spontaneous IMHA and ITP at presentation and following successful treatment. In total, 21 affected and 13 healthy control dogs were included in the study. RESULTS IMHA/ITP is associated with remodeling of fecal microbiota, marked by decreased relative abundance of the spirochete Treponema spp., increased relative abundance of the pathobionts Clostridium septicum and Escherichia coli, and increased overall microbial diversity. Logistic regression analysis demonstrated that Treponema spp. were associated with decreased risk of IMHA/ITP (odds ratio [OR] 0.24-0.34), while Ruminococcaceae UCG-009 and Christensenellaceae R-7 group were associated with increased risk of disease (OR = 6.84 [95% CI 2-32.74] and 8.36 [95% CI 1.85-71.88] respectively). CONCLUSIONS This study demonstrates an association of immune-mediated hematological diseases in dogs with fecal dysbiosis, and points to specific bacterial genera as biomarkers of disease. Microbes identified as positive or negative risk factors for IMHA/ITP represent an area for future research as potential targets for new diagnostic assays and/or therapeutic applications.
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Affiliation(s)
- P-Y Liu
- Department of Pathobiology and Population Sciences, The Royal Veterinary College, Royal College Street, London, NW1 0TU, UK
- School of Medicine, College of Medicine, National Sun Yat-sen University, Kaohsiung, 804201, Taiwan
| | - D Xia
- Department of Pathobiology and Population Sciences, The Royal Veterinary College, Royal College Street, London, NW1 0TU, UK
| | - K McGonigle
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, 3900 Spruce Street, Philadelphia, PA, 19104, USA
| | - A B Carroll
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, 3900 Spruce Street, Philadelphia, PA, 19104, USA
| | - J Chiango
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, 3900 Spruce Street, Philadelphia, PA, 19104, USA
| | - H Scavello
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, 3900 Spruce Street, Philadelphia, PA, 19104, USA
| | - R Martins
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, 3900 Spruce Street, Philadelphia, PA, 19104, USA
| | - S Mehta
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, 380 South University Avenue, Philadelphia, 19104, USA
| | - E Krespan
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, 380 South University Avenue, Philadelphia, 19104, USA
| | - E Lunde
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, 1809 South Riverside Drive, Ames, IA, 50011, USA
| | - D LeVine
- Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, 1809 South Riverside Drive, Ames, IA, 50011, USA
- Department of Clinical Sciences, College of Veterinary Medicine, Auburn University, 1220 Wire Road, Auburn, AL, 36849, USA
| | - C L Fellman
- Department of Clinical Sciences, Cummings School of Veterinary Medicine, Tufts University, North Grafton, MA, 01536, USA
| | - R Goggs
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, 930 Campus Road, Box 31, Ithaca, NY, 14853, USA
| | - D P Beiting
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, 380 South University Avenue, Philadelphia, 19104, USA
| | - O A Garden
- Department of Clinical Sciences and Advanced Medicine, School of Veterinary Medicine, University of Pennsylvania, 3900 Spruce Street, Philadelphia, PA, 19104, USA.
- Dean's Office, School of Veterinary Medicine, Louisiana State University, Skip Bertman Drive, Baton Rouge, LA, 70803, USA.
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25
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Liu D, Chen R, Wang YJ, Li W, Liu LL, Lin LR, Yang TC, Tong ML. Insights into the protective immune response by immunization with full-length recombinant TprK protein: cellular and humoral responses. NPJ Vaccines 2023; 8:146. [PMID: 37773233 PMCID: PMC10542339 DOI: 10.1038/s41541-023-00748-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 09/19/2023] [Indexed: 10/01/2023] Open
Abstract
Syphilis has resurged in many countries, which has called attention to vaccine development. Based on the immunization-based rabbit model of infection with the Nichols strain, this study explored the protective immune response of a controversial syphilis vaccine candidate, TprK, and found that immunization with full-length rTprK was effective in attenuating lesion development and accelerating lesion resolution, which could reduce the probability of the pathogen spreading to distant tissue sites to prevent the progression of the disease to some extent. Furthermore, the results revealed that immunization with rTprK not only rapidly induced a strong Th1-like cellular response but also elicited a humoral immune response to produce opsonic antibodies to enhance macrophage-mediated opsonophagocytosis. Although complete protection against infection was not achieved, the study provided a comprehensive and in-depth exploration of the immunogenicity of TprK and highlighted the importance of TprK as a promising syphilis vaccine component.
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Affiliation(s)
- Dan Liu
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Rui Chen
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Yong-Jing Wang
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Wei Li
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Li-Li Liu
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Li-Rong Lin
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Tian-Ci Yang
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China.
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China.
| | - Man-Li Tong
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China.
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China.
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Chauhan K, Fonollosa A, Giralt L, Artaraz J, Randerson EL, Goldstein DA, Furtado JM, Smith JR, Sudharshan S, Ahmed AS, Nair N, Joseph J, Pavesio C, Westcott M, Trepatchayakorn S, Sallam AB, Elhusseiny AM, Tyagi M. Demystifying Ocular Syphilis - A Major Review. Ocul Immunol Inflamm 2023; 31:1425-1439. [PMID: 37307579 DOI: 10.1080/09273948.2023.2217246] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 05/16/2023] [Accepted: 05/18/2023] [Indexed: 06/14/2023]
Abstract
Syphilis, caused by the spirochaete, Treponema pallidum, continues to be a public health challenge globally with its rates steadily increasing in the past few years. The disease is transmitted through small breaks in the skin during sexual contact, or via congenital transmission in utero, either across the placenta or by contact with an active genital lesion during delivery. Estimated 5.7-6 million new cases are detected every year worldwide in the 15-49 years age group. An increased incidence has been reported in most populations with particular clusters in special groups like men who have sex with men, female sex workers, and their male clients. Ocular syphilis has a varied presentation and is considered a great mimicker in all cases of uveitis. The laboratory diagnosis of syphilis is predominantly based on serological tests including TPHA and VDRL. Parenteral penicillin is the cornerstone of treatment for all stages of ocular syphilis.
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Affiliation(s)
- Khushboo Chauhan
- Uveitis and Ocular Immunology Services, L V Prasad Eye Institute, Hyderabad, India
- Smt. Kanuri Santhamma Centre for Vitreo-Retinal Diseases, L V Prasad Eye Institute, Hyderabad, India
| | - Alex Fonollosa
- Department of Ophthalmology, Biocruces Bizkaia Health Research Institute, Cruces University Hospital, University of the Basque Country, Barakaldo, Spain
- Department of Retina, Instituto Oftalmológico Bilbao, Bilbao, Spain
| | - Lena Giralt
- Department of Ophthalmology, Biocruces Bizkaia Health Research Institute, Cruces University Hospital, University of the Basque Country, Barakaldo, Spain
| | - Joseba Artaraz
- Department of Ophthalmology, Biocruces Bizkaia Health Research Institute, Cruces University Hospital, University of the Basque Country, Barakaldo, Spain
| | | | - Debra A Goldstein
- Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - João M Furtado
- Division of Ophthalmology, Ribeirão Preto Medical School, São Paulo, Brazil
| | - Justine R Smith
- Division of Ophthalmology, Ribeirão Preto Medical School, São Paulo, Brazil
- Flinders University College of Medicine & Public Health, Adelaide, Australia
| | - Sridharan Sudharshan
- Department of Uveitis, Medical Research Foundation, Sankara Nethralaya, Chennai, India
| | - Arshee S Ahmed
- Department of Uveitis, Medical Research Foundation, Sankara Nethralaya, Chennai, India
| | - Nivedita Nair
- Department of Uveitis, Medical Research Foundation, Sankara Nethralaya, Chennai, India
| | - Joveeta Joseph
- Jhaveri Microbiology Center, L V Prasad Eye Institute, Hyderabad, India
| | | | | | | | - Ahmed B Sallam
- Department of Ophthalmology, Harvey and Bernice Jones Eye Institute, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Abdelrahman M Elhusseiny
- Department of Ophthalmology, Harvey and Bernice Jones Eye Institute, University of Arkansas for Medical Sciences, Little Rock, Arkansas, USA
| | - Mudit Tyagi
- Uveitis and Ocular Immunology Services, L V Prasad Eye Institute, Hyderabad, India
- Smt. Kanuri Santhamma Centre for Vitreo-Retinal Diseases, L V Prasad Eye Institute, Hyderabad, India
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27
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Ferguson MR, Delgado KN, McBride S, Orbe IC, La Vake CJ, Caimano MJ, Mendez Q, Moraes TF, Schryvers AB, Moody MA, Radolf JD, Weiner MP, Hawley KL. Use of Epivolve phage display to generate a monoclonal antibody with opsonic activity directed against a subdominant epitope on extracellular loop 4 of Treponema pallidum BamA (TP0326). Front Immunol 2023; 14:1222267. [PMID: 37675118 PMCID: PMC10478084 DOI: 10.3389/fimmu.2023.1222267] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Accepted: 07/19/2023] [Indexed: 09/08/2023] Open
Abstract
Introduction Syphilis, a sexually transmitted infection caused by the spirochete Treponema pallidum (Tp), is resurging globally. Tp's repertoire of outer membrane proteins (OMPs) includes BamA (β-barrel assembly machinery subunit A/TP0326), a bipartite protein consisting of a 16-stranded β-barrel with nine extracellular loops (ECLs) and five periplasmic POTRA (polypeptide transport-associated) domains. BamA ECL4 antisera promotes internalization of Tp by rabbit peritoneal macrophages. Methods Three overlapping BamA ECL4 peptides and a two-stage, phage display strategy, termed "Epivolve" (for epitope evolution) were employed to generate single-chain variable fragments (scFvs). Additionally, antisera generated by immunizing mice and rabbits with BamA ECL4 displayed by a Pyrococcus furiosus thioredoxin scaffold (PfTrxBamA/ECL4). MAbs and antisera reactivities were evaluated by immunoblotting and ELISA. A comparison of murine and rabbit opsonophagocytosis assays was conducted to evaluate the functional ability of the Abs (e.g., opsonization) and validate the mouse assay. Sera from Tp-infected mice (MSS) and rabbits (IRS) were evaluated for ECL4-specific Abs using PfTrxBamA/ECL4 and overlapping ECL4 peptides in immunoblotting and ELISA assays. Results Each of the five mAbs demonstrated reactivity by immunoblotting and ELISA to nanogram amounts of PfTrxBamA/ECL4. One mAb, containing a unique amino acid sequence in both the light and heavy chains, showed activity in the murine opsonophagocytosis assay. Mice and rabbits hyperimmunized with PfTrxBamA/ECL4 produced opsonic antisera that strongly recognized the ECL presented in a heterologous scaffold and overlapping ECL4 peptides, including S2. In contrast, Abs generated during Tp infection of mice and rabbits poorly recognized the peptides, indicating that S2 contains a subdominant epitope. Discussion Epivolve produced mAbs target subdominant opsonic epitopes in BamA ECL4, a top syphilis vaccine candidate. The murine opsonophagocytosis assay can serve as an alternative model to investigate the opsonic potential of vaccinogens. Detailed characterization of BamA ECL4-specific Abs provided a means to dissect Ab responses elicited by Tp infection.
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Affiliation(s)
- Mary R. Ferguson
- Department of Molecular Sciences, Abbratech, Branford, CT, United States
| | | | | | - Isabel C. Orbe
- Department of Pediatrics, UConn Health, Farmington, CT, United States
| | - Carson J. La Vake
- Department of Pediatrics, UConn Health, Farmington, CT, United States
| | - Melissa J. Caimano
- Department of Medicine, UConn Health, Farmington, CT, United States
- Department of Pediatrics, UConn Health, Farmington, CT, United States
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT, United States
| | - Qiana Mendez
- Department of Molecular Sciences, Abbratech, Branford, CT, United States
| | - Trevor F. Moraes
- Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Anthony B. Schryvers
- Department of Microbiology, Immunology and Infectious Diseases, University of Calgary, Calgary, AB, Canada
| | - M. Anthony Moody
- Duke Human Vaccine Institute, Durham, NC, United States
- Department of Pediatrics, Duke University Medical Center, Durham, NC, United States
- Department of Integrative Immunobiology, Duke University Medical Center, Durham, NC, United States
| | - Justin D. Radolf
- Department of Medicine, UConn Health, Farmington, CT, United States
- Department of Pediatrics, UConn Health, Farmington, CT, United States
- Department of Molecular Biology and Biophysics, UConn Health, Farmington, CT, United States
- Department of Immunology, UConn Health, Farmington, CT, United States
- Department of Genetics and Genome Sciences, UConn Health, Farmington, CT, United States
| | - Michael P. Weiner
- Department of Molecular Sciences, Abbratech, Branford, CT, United States
| | - Kelly L. Hawley
- Department of Medicine, UConn Health, Farmington, CT, United States
- Department of Pediatrics, UConn Health, Farmington, CT, United States
- Department of Immunology, UConn Health, Farmington, CT, United States
- Division of Infectious Diseases and Immunology, Connecticut Children’s, Hartford, CT, United States
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Li S, Li W, Jin Y, Wu B, Wu Y. Advancements in the development of nucleic acid vaccines for syphilis prevention and control. Hum Vaccin Immunother 2023; 19:2234790. [PMID: 37538024 PMCID: PMC10405752 DOI: 10.1080/21645515.2023.2234790] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 06/12/2023] [Accepted: 07/05/2023] [Indexed: 08/05/2023] Open
Abstract
Syphilis, a chronic systemic sexually transmitted disease, is caused by the bacterium Treponema pallidum (T. pallidum). Currently, syphilis remains a widespread infectious disease with significant disease burden in many countries. Despite the absence of identified penicillin-resistant strains, challenges in syphilis treatment persist due to penicillin allergies, supply issues, and the emergence of macrolide-resistant strains. Vaccines represent the most cost-effective strategy to prevent and control the syphilis epidemic. In light of the ongoing global coronavirus disease 2019 (COVID-19) pandemic, nucleic acid vaccines have gained prominence in the field of vaccine research and development, owing to their superior efficiency compared to traditional vaccines. This review summarizes the current state of the syphilis epidemic and the preliminary findings in T. pallidum nucleic acid vaccine research, discusses the challenges associated with the development of T. pallidum nucleic acid vaccines, and proposes strategies and measures for future T. pallidum vaccine development.
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Affiliation(s)
- Sijia Li
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Weiwei Li
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
- Department of Clinical Laboratory, The Second People’s Hospital of Foshan, Foshan, China
| | - Yinqi Jin
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
| | - Bin Wu
- First Affiliated Hospital, Guangdong Medical University, Zhanjiang, Guangdong, China
| | - Yimou Wu
- Hunan Province Cooperative Innovation Center for Molecular Target New Drug Study, Hengyang Medical College, Institution of Pathogenic Biology, University of South China, Hengyang, China
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Hu YT, Wu KX, Wang XT, Zhao YY, Jiang XY, Liu D, Tong ML, Liu LL. Treponema pallidum promoted microglia apoptosis and prevented itself from clearing by human microglia via blocking autophagic flux. PLoS Pathog 2023; 19:e1011594. [PMID: 37611054 PMCID: PMC10446187 DOI: 10.1371/journal.ppat.1011594] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 08/02/2023] [Indexed: 08/25/2023] Open
Abstract
Treponema pallidum (Tp) has a well-known ability to evade the immune system and can cause neurosyphilis by invading the central nervous system (CNS). Microglia are resident macrophages of the CNS that are essential for host defense against pathogens, this study aims to investigate the interaction between Tp and microglia and the potential mechanism. Here, we found that Tp can exert significant toxic effects on microglia in vivo in Tg (mpeg1: EGFP) transgenic zebrafish embryos. Single-cell RNA sequencing results showed that Tp downregulated autophagy-related genes in human HMC3 microglial cells, which is negatively associated with apoptotic gene expression. Biochemical and cell biology assays further established that Tp inhibits microglial autophagy by interfering with the autophagosome-lysosome fusion process. Transcription factor EB (TFEB) is a master regulator of lysosome biogenesis, Tp activates the mechanistic target of rapamycin complex 1 (mTORC1) signaling to inhibit the nuclear translocation of TFEB, leading to decreased lysosomal biogenesis and accumulated autophagosome. Importantly, the inhibition of autophagosome formation reversed Tp-induced apoptosis and promoted microglial clearance of Tp. Taken together, these findings show that Tp blocks autophagic flux by inhibiting TFEB-mediated lysosomal biosynthesis in human microglia. Autophagosome accumulation was demonstrated to be a key mechanism underlying the effects of Tp in promoting apoptosis and preventing itself from clearing by human microglia. This study offers novel perspectives on the potential mechanism of immune evasion employed by Tp within CNS. The results not only establish the pivotal role of autophagy dysregulation in the detrimental effects of Tp on microglial cells but also bear considerable implications for the development of therapeutic strategies against Tp, specifically involving mTORC1 inhibitors and autophagosome formation inhibitors, in the context of neurosyphilis patients.
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Affiliation(s)
- Yun-Ting Hu
- Center of Clinical Laboratory, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China
| | - Kai-Xuan Wu
- Department of Clinical Laboratory, Qilu Hospital (Qingdao), Cheeloo College of Medicine, Shandong University, China
| | - Xiao-Tong Wang
- Center of Clinical Laboratory, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China
- Department of Laboratory, Tianjin Medical University Cancer Institute and Hospital, Tianjin’s Clinical Research Center for Cancer, Key Laboratory of Cancer Prevention and Therapy, National Clinical Research Center for Cancer, Tianjin, China
| | - Yuan-Yi Zhao
- Center of Clinical Laboratory, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China
| | - Xiao-Yong Jiang
- Department of Dermatology, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China
| | - Dan Liu
- Center of Clinical Laboratory, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China
| | - Man-Li Tong
- Center of Clinical Laboratory, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China
| | - Li-Li Liu
- Center of Clinical Laboratory, Zhongshan Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China
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Seña AC, Matoga MM, Yang L, Lopez-Medina E, Aghakanian F, Chen JS, Bettin EB, Caimano MJ, Chen W, Garcia-Luna JA, Hennelly CM, Jiang Y, Juliano JJ, Pospíšilová P, Ramirez L, Šmajs D, Tucker JD, Cely FV, Zheng H, Hoffman IF, Yang B, Moody MA, Hawley KL, Salazar JC, Radolf JD, Parr JB. Clinical and genomic diversity of Treponema pallidum subsp. pallidum: A global, multi-center study of early syphilis to inform vaccine research. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2023:2023.07.19.23291250. [PMID: 37546832 PMCID: PMC10402240 DOI: 10.1101/2023.07.19.23291250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/08/2023]
Abstract
Background The continuing increase in syphilis rates worldwide necessitates development of a vaccine with global efficacy. We conducted a multi-center, observational study to explore Treponema pallidum subsp. pallidum ( TPA ) molecular epidemiology essential for vaccine research by analyzing clinical data and specimens from early syphilis patients using whole-genome sequencing (WGS) and publicly available WGS data. Methods We enrolled patients with primary (PS), secondary (SS) or early latent (ELS) syphilis from clinics in China, Colombia, Malawi and the United States between November 2019 - May 2022. Inclusion criteria included age ≥18 years, and syphilis confirmation by direct detection methods and/or serological testing. TPA detection and WGS were conducted on lesion swabs, skin biopsies/scrapings, whole blood, and/or rabbit-passaged isolates. We compared our WGS data to publicly available genomes, and analysed TPA populations to identify mutations associated with lineage and geography. Findings We screened 2,820 patients and enrolled 233 participants - 77 (33%) with PS, 154 (66%) with SS, and two (1%) with ELS. Median age of participants was 28; 66% were cis -gender male, of which 43% reported identifying as "gay", "bisexual", or "other sexuality". Among all participants, 56 (24%) had HIV co-infection. WGS data from 113 participants demonstrated a predominance of SS14-lineage strains with geographic clustering. Phylogenomic analysis confirmed that Nichols-lineage strains are more genetically diverse than SS14-lineage strains and cluster into more distinct subclades. Differences in single nucleotide variants (SNVs) were evident by TPA lineage and geography. Mapping of highly differentiated SNVs to three-dimensional protein models demonstrated population-specific substitutions, some in outer membrane proteins (OMPs) of interest. Interpretation Our study involving participants from four countries substantiates the global diversity of TPA strains. Additional analyses to explore TPA OMP variability within strains will be vital for vaccine development and improved understanding of syphilis pathogenesis on a population level. Funding National Institutes of Health, Bill and Melinda Gates Foundation.
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Peeling RW, Mabey D, Chen XS, Garcia PJ. Syphilis. Lancet 2023; 402:336-346. [PMID: 37481272 DOI: 10.1016/s0140-6736(22)02348-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Revised: 09/16/2022] [Accepted: 11/10/2022] [Indexed: 07/24/2023]
Abstract
Syphilis is a sexually and vertically transmitted bacterial infection caused by the bacterium Treponema pallidum. Its prevalence is high in low-income and middle-income countries, and its incidence has increased in high-income countries in the last few decades among men who have sex with men. Syphilis is a major cause of adverse pregnancy outcomes in low-income and middle-income countries. Clinical features include a primary chancre at the point of inoculation, followed weeks later by the rash of secondary syphilis, a latent period, and in some cases, involvement of the eyes, CNS, and cardiovascular systems. It is diagnosed serologically. A single intramuscular dose of long-acting benzathine penicillin is recommended for people who have had syphilis for less than 1 year and longer courses for people with late latent syphilis. Control strategies include screening and treatment of all pregnant women, and targeted interventions for groups at high risk. Vaccine development, research on antibiotic prophylaxis, and digital messaging as prevention strategies are ongoing.
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Affiliation(s)
- Rosanna W Peeling
- London School of Hygiene & Tropical Medicine, London, UK; University of Manitoba, Winnipeg, MB, Canada.
| | - David Mabey
- London School of Hygiene & Tropical Medicine, London, UK
| | - Xiang-Sheng Chen
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China; National Center for STD Control, Nanjing, China; Center for Global Health, Southern Medical University, Guangzhou, China
| | - Patricia J Garcia
- School of Public Health, Universidad Peruana Cayetano Heredia, Lima, Peru; University of Washington, Seattle, WA, USA
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Liu D, Liu LL, Zheng XQ, Chen R, Lin LR, Yang TC, Tong ML. Genetic Profiling of the Full-Length tprK Gene in Patients with Primary and Secondary Syphilis. Microbiol Spectr 2023; 11:e0493122. [PMID: 37036342 PMCID: PMC10269439 DOI: 10.1128/spectrum.04931-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Accepted: 03/17/2023] [Indexed: 04/11/2023] Open
Abstract
TprK antigenic variation is acknowledged as an important strategy developed by Treponema pallidum to achieve immune evasion. Previous studies applied short-read sequencing to explore tprK gene sequence diversity in clinical samples; however, due to the limitations of short-read sequencing, it was difficult to determine the linkage between the seven V regions, and crucial information about full-length tprK variants was lost. Although two recent studies explored complete tprK gene profiles in natural human syphilis infection, there are still too few profiled full-length tprK variants among clinical T. pallidum isolates to fully understand the characteristics of TprK coding diversity. Here, Pacific Biosciences (PacBio) long-read sequencing was applied to examine the diversity of full-length tprK variants in 21 clinical T. pallidum isolates from 11 patients with primary syphilis and 10 patients with secondary syphilis. A total of 398 high-confidence full-length sequences, which presented remarkable sequence heterogeneity, were found. However, these full-length tprK variants exhibited limited variation in length and GC content, showing 24 length types and average GC content of 51.5 ± 0.42% and 51.6 ± 0.26% for primary and secondary syphilis samples, respectively. Additionally, the combined patterns of mutated V regions generating new tprK variants were obviously different in primary and secondary syphilis samples. The diversity of tprK gene sequences in primary syphilis samples may represent the underlying variability of the bacterium; conversely, the variability of the tprK gene in secondary syphilis samples may more accurately reflect how T. pallidum escapes host immune clearance. These data highlight the tprK gene as an important coding gene that shows conflicting genetic characteristics but underlies the persistence of spirochete infection. IMPORTANCE The resurgence of syphilis in both low- and high-income countries has attracted attention, and persistent infection by the pathogen has long been a research focus. The tprK gene, encoding the hypervariable outer membrane protein, is thought to be responsible for pathogen immune evasion and persistent infection. Here, PacBio long-read sequencing was applied to examine the diversity of full-length tprK variants in 21 clinical T. pallidum isolates from 11 patients with primary syphilis and 10 patients with secondary syphilis. The results showed that the sequences of the tprK gene were remarkably heterogeneous; however, the sequences presented limited variation in length and GC content. The investigation of the combined patterns of the V regions allowed us to gain insight into the features of the tprK gene generating new variants at different clinical stages. The findings of this study will be helpful for further exploration of the pathogenesis of syphilis.
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Affiliation(s)
- Dan Liu
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Li-Li Liu
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Xin-Qi Zheng
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Rui Chen
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Li-Rong Lin
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Tian-Ci Yang
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
| | - Man-Li Tong
- Center of Clinical Laboratory, Zhongshan Hospital, School of Medicine, Xiamen University, Xiamen, China
- Institute of Infectious Disease, School of Medicine, Xiamen University, Xiamen, China
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Lynch MJ, Deshpande M, Kyrniyati K, Zhang K, James M, Miller M, Zhang S, Passalia FJ, Wunder EA, Charon NW, Li C, Crane BR. Lysinoalanine crosslinking is a conserved post-translational modification in the spirochete flagellar hook. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.13.544825. [PMID: 37398457 PMCID: PMC10312707 DOI: 10.1101/2023.06.13.544825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Spirochete bacteria cause Lyme disease, leptospirosis, syphilis and several other human illnesses. Unlike other bacteria, spirochete flagella are enclosed within the periplasmic space where the filaments distort and push the cell body by action of the flagellar motors. We previously demonstrated that the oral pathogen Treponema denticola (Td) catalyzes the formation of covalent lysinoalanine (Lal) crosslinks between conserved cysteine and lysine residues of the FlgE protein that composes the flagellar hook. Although not necessary for hook assembly, Lal is required for motility of Td, presumably due to the stabilizing effect of the crosslink. Herein, we extend these findings to other, representative spirochete species across the phylum. We confirm the presence of Lal crosslinked peptides in recombinant and in vivo -derived samples from Treponema spp., Borreliella spp., Brachyspira spp., and Leptospira spp.. Like with Td, a mutant strain of the Lyme disease pathogen Borreliella burgdorferi unable to form the crosslink has impaired motility. FlgE from Leptospira spp. does not conserve the Lal-forming cysteine residue which is instead substituted by serine. Nevertheless, Leptospira interrogans also forms Lal, with several different Lal isoforms being detected between Ser-179 and Lys-145, Lys-148, and Lys-166, thereby highlighting species or order-specific differences within the phylum. Our data reveals that the Lal crosslink is a conserved and necessary post-translational modification across the spirochete phylum and may thus represent an effective target for spirochete-specific antimicrobials. Significance Statement The phylum Spirochaetota contains bacterial pathogens responsible for a variety of diseases, including Lyme disease, syphilis, periodontal disease, and leptospirosis. Motility of these pathogens is a major virulence factor that contributes to infectivity and host colonization. The oral pathogen Treponema denticola produces a post-translational modification (PTM) in the form of a lysinoalanine (Lal) crosslink between neighboring subunits of the flagellar hook protein FlgE. Herein, we demonstrate that representative spirochetes species across the phylum all form Lal in their flagellar hooks. T. denticola and B. burgdorferi cells incapable of forming the crosslink are non-motile, thereby establishing the general role of the Lal PTM in the unusual type of flagellar motility evolved by spirochetes.
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Brautigam CA, Deka RK, Tso SC, Liu WZ, Norgard MV. Biophysical and biochemical studies support TP0094 as a phosphotransacetylase in an acetogenic energy-conservation pathway in Treponema pallidum. PLoS One 2023; 18:e0283952. [PMID: 37200262 PMCID: PMC10194888 DOI: 10.1371/journal.pone.0283952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2023] [Accepted: 03/21/2023] [Indexed: 05/20/2023] Open
Abstract
The mechanisms of energy generation and carbon-source utilization in the syphilis spirochete Treponema pallidum have remained enigmatic despite complete genomic sequence information. Whereas the bacterium harbors enzymes for glycolysis, the apparatus for more efficient use of glucose catabolites, namely the citric-acid cycle, is apparently not present. Yet, the organism's energy needs likely exceed the modest output from glycolysis alone. Recently, building on our structure-function studies of T. pallidum lipoproteins, we proposed a "flavin-centric" metabolic lifestyle for the organism that partially resolves this conundrum. As a part of the hypothesis, we have proposed that T. pallidum contains an acetogenic energy-conservation pathway that catabolizes D-lactate, yielding acetate, reducing equivalents for the generation and maintenance of chemiosmotic potential, and ATP. We already have confirmed the D-lactate dehydrogenase activity in T. pallidum necessary for this pathway to operate. In the current study, we focused on another enzyme ostensibly involved in treponemal acetogenesis, phosphotransacetylase (Pta). This enzyme is putatively identified as TP0094 and, in this study, we determined a high-resolution (1.95 Å) X-ray crystal structure of the protein, finding that its fold comports with other known Pta enzymes. Further studies on its solution behavior and enzyme activity confirmed that it has the properties of a Pta. These results are consistent with the proposed acetogenesis pathway in T. pallidum, and we propose that the protein be referred to henceforth as TpPta.
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Affiliation(s)
- Chad A. Brautigam
- Department of Biophysics, UT Southwestern Medical Center, Dallas, Texas, United States of America
- Department of Microbiology, UT Southwestern Medical Center, Dallas, Texas, United States of America
| | - Ranjit K. Deka
- Department of Microbiology, UT Southwestern Medical Center, Dallas, Texas, United States of America
| | - Shih-Chia Tso
- Department of Biophysics, UT Southwestern Medical Center, Dallas, Texas, United States of America
| | - Wei Z. Liu
- Department of Microbiology, UT Southwestern Medical Center, Dallas, Texas, United States of America
| | - Michael V. Norgard
- Department of Microbiology, UT Southwestern Medical Center, Dallas, Texas, United States of America
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Sadoghi B, Stary G, Wolf P. Syphilis. J Dtsch Dermatol Ges 2023; 21:504-517. [PMID: 37183747 DOI: 10.1111/ddg.14999] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 12/28/2022] [Indexed: 05/16/2023]
Abstract
Syphilis is a curable systemic infectious disease with a clear increase in incidence in recent years. The disease presents with a broad clinical spectrum and challenges clinicians due to the long incubation period and the sometimes complex interpretation of serological test results. Penicillin G remains the treatment of choice in all stages of syphilis.
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Affiliation(s)
- Birgit Sadoghi
- Department of Dermatology and Venereology, Medical University of Graz, Graz, Austria
| | - Georg Stary
- Department of Dermatology, Medical University Vienna, Vienna, Austria
| | - Peter Wolf
- Department of Dermatology and Venereology, Medical University of Graz, Graz, Austria
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36
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Sadoghi B, Stary G, Wolf P. Syphilis. J Dtsch Dermatol Ges 2023; 21:504-519. [PMID: 37183735 DOI: 10.1111/ddg.14999_g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 12/28/2022] [Indexed: 05/16/2023]
Affiliation(s)
- Birgit Sadoghi
- Universitätsklink für Dermatologie und Venerologie, Medizinische Universität Graz, Graz, Österreich
| | - Georg Stary
- Universiätsklinik für Dermatologie, Medizinische Universität Wien, Wien, Österreich
| | - Peter Wolf
- Universitätsklink für Dermatologie und Venerologie, Medizinische Universität Graz, Graz, Österreich
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Ávila-Nieto C, Pedreño-López N, Mitjà O, Clotet B, Blanco J, Carrillo J. Syphilis vaccine: challenges, controversies and opportunities. Front Immunol 2023; 14:1126170. [PMID: 37090699 PMCID: PMC10118025 DOI: 10.3389/fimmu.2023.1126170] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Accepted: 03/27/2023] [Indexed: 04/25/2023] Open
Abstract
Syphilis is a sexually or vertically (mother to fetus) transmitted disease caused by the infection of Treponema pallidum subspecie pallidum (TPA). The incidence of syphilis has increased over the past years despite the fact that this bacterium is an obligate human pathogen, the infection route is well known, and the disease can be successfully treated with penicillin. As complementary measures to preventive campaigns and early treatment of infected individuals, development of a syphilis vaccine may be crucial for controlling disease spread and/or severity, particularly in countries where the effectiveness of the aforementioned measures is limited. In the last century, several vaccine prototypes have been tested in preclinical studies, mainly in rabbits. While none of them provided protection against infection, some prototypes prevented bacteria from disseminating to distal organs, attenuated lesion development, and accelerated their healing. In spite of these promising results, there is still some controversy regarding the identification of vaccine candidates and the characteristics of a syphilis-protective immune response. In this review, we describe what is known about TPA immune response, and the main mechanisms used by this pathogen to evade it. Moreover, we emphasize the importance of integrating this knowledge, in conjunction with the characterization of outer membrane proteins (OMPs), to expedite the development of a syphilis vaccine that can protect against TPA infection.
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Affiliation(s)
- Carlos Ávila-Nieto
- IrsiCaixa AIDS Research Institute, Badalona, Spain
- Autonomous University of Barcelona, Cerdanyola del Vallès, Catalonia, Spain
| | | | - Oriol Mitjà
- Skin Neglected Tropical Diseases and Sexually Transmitted Infections Department, Germans Trias i Pujol Hospital, Badalona, Spain
- Fight Infections Foundation, Germans Trias i Pujol Hospital, Badalona, Catalonia, Spain
- Centre for Health and Social Care Research (CESS), Faculty of Medicine, University of Vic – Central University of Catalonia (UVic – UCC), Vic, Catalonia, Spain
| | - Bonaventura Clotet
- IrsiCaixa AIDS Research Institute, Badalona, Spain
- Fight Infections Foundation, Germans Trias i Pujol Hospital, Badalona, Catalonia, Spain
- Centre for Health and Social Care Research (CESS), Faculty of Medicine, University of Vic – Central University of Catalonia (UVic – UCC), Vic, Catalonia, Spain
- Germans Trias i Pujol Research Institute (IGTP), Badalona, Spain
- CIBERINFEC, Instituto de Salut Carlos III (ISCIII), Madrid, Spain
| | - Julià Blanco
- IrsiCaixa AIDS Research Institute, Badalona, Spain
- Centre for Health and Social Care Research (CESS), Faculty of Medicine, University of Vic – Central University of Catalonia (UVic – UCC), Vic, Catalonia, Spain
- Germans Trias i Pujol Research Institute (IGTP), Badalona, Spain
- CIBERINFEC, Instituto de Salut Carlos III (ISCIII), Madrid, Spain
| | - Jorge Carrillo
- IrsiCaixa AIDS Research Institute, Badalona, Spain
- Germans Trias i Pujol Research Institute (IGTP), Badalona, Spain
- CIBERINFEC, Instituto de Salut Carlos III (ISCIII), Madrid, Spain
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Lan LY, Hong QX, Gao SM, Li Q, You YY, Chen W, Fan PF. Gut microbiota of skywalker hoolock gibbons (Hoolock tianxing) from different habitats and in captivity: Implications for gibbon health. Am J Primatol 2023; 85:e23468. [PMID: 36691713 DOI: 10.1002/ajp.23468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2022] [Revised: 01/10/2023] [Accepted: 01/12/2023] [Indexed: 01/25/2023]
Abstract
The gut microbiota plays an integral role in the metabolism and immunity of animal hosts, and provides insights into the health and habitat assessment of threatened animals. The skywalker hoolock gibbon (Hoolock tianxing) is a newly described gibbon species, and is considered an endangered species. Here, we used 16S rRNA amplicon sequencing to describe the fecal bacterial community of skywalker hoolock gibbons from different habitats and in captivity. Fecal samples (n = 5) from two captive gibbons were compared with wild populations (N = 6 gibbons, n = 33 samples). At the phylum level, Spirochetes, Proteobacteria, Firmicutes, Bacteroidetes dominated in captive gibbons, while Firmicutes, Bacteroidetes, and Tenericutes dominated in wild gibbons. At the genus level, captive gibbons were dominated by Treponema-2, followed by Succinivibrio and Cerasicoccus, while wild gibbons were dominated by Anaeroplasma, Prevotellaceae UCG-001, and Erysipelotrichaceae UCG-004. Captive rearing was significantly associated with lower taxonomic alpha-diversity, and different relative abundance of some dominant bacteria compared to wild gibbons. Predicted Kyoto Encyclopedia of Genes and Genomes pathway analyses showed that captive gibbons have significantly lower total pathway diversity and higher relative abundance of bacterial functions involved in "drug resistance: antimicrobial" and "carbohydrate metabolism" than wild gibbons. This study reveals the potential influence of captivity and habitat on the gut bacterial community of gibbons and provides a basis for guiding the conservation management of captive populations.
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Affiliation(s)
- Li-Ying Lan
- School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Qi-Xuan Hong
- School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Shao-Ming Gao
- School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Qi Li
- School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Yu-Yan You
- Beijing Key Laboratory of Captive Wildlife Technologies, Beijing Zoo, Beijing, China
| | - Wu Chen
- Guangzhou Zoo, Guangzhou, China
| | - Peng-Fei Fan
- School of Life Sciences, Sun Yat-sen University, Guangzhou, China
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Edmondson DG, De Lay BD, Hanson BM, Kowis LE, Norris SJ. Clonal isolates of Treponema pallidum subsp. pallidum Nichols provide evidence for the occurrence of microevolution during experimental rabbit infection and in vitro culture. PLoS One 2023; 18:e0281187. [PMID: 36917571 PMCID: PMC10013896 DOI: 10.1371/journal.pone.0281187] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 01/17/2023] [Indexed: 03/15/2023] Open
Abstract
The recent development of a system for long-term in vitro culture of the syphilis spirochete, Treponema pallidum subsp. pallidum, has introduced the possibility of detailed genetic analysis of this bacterium. In this study, the in vitro culture system was used to isolate and characterize clonal populations of T. pallidum subsp. pallidum Nichols, the most widely studied strain. In limiting dilutions experiments, it was possible to establish cultures with inocula as low as 0.5 T. pallidum per well despite the long generation time (~35 to 40 hours) of this organism. Six Nichols strain clones isolated by limiting dilution were characterized in detail. All clones exhibited indistinguishable morphology and motility, highly similar in vitro multiplication rates, and comparable infectivity in the rabbit model (ID50 ≤ 100 bacteria). Genomic sequencing revealed sequence heterogeneity in the form of insertions or deletions at 5 sites, single nucleotide variations at 20 sites, and polynucleotide (polyG/C) tract length differences at 22 locations. Genomic sequences of the uncloned Nichols strain preparations propagated in rabbits or in vitro cultures exhibited substantial heterogeneity at these locations, indicating coexistence of many varied 'clonotypes' within these populations. Nearly all genetic variations were specific for the Nichols strain and were not detected in the >280 T. pallidum genomic sequences that are currently available. We hypothesize that these Nichols strain-specific sequence variations arose independently either during human infection or within the 110 years since the strain's initial isolation, and thus represent examples of microevolution and divergence.
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Affiliation(s)
- Diane G. Edmondson
- Department of Pathology & Laboratory Medicine, McGovern Medical School, University of Texas Health Science Center, Houston, Texas, United States of America
| | - Bridget D. De Lay
- Department of Pathology & Laboratory Medicine, McGovern Medical School, University of Texas Health Science Center, Houston, Texas, United States of America
| | - Blake M. Hanson
- Department of Pediatrics, McGovern Medical School, University of Texas Health Science Center, Houston, Texas, United States of America
- Department of Epidemiology, Human Genetics & Environmental Sciences, Center for Infectious Diseases, School of Public Health, University of Texas Health Science Center, Houston, Texas, United States of America
| | - Lindsay E. Kowis
- Houston Methodist Research Institute, Infectious Disease, Houston, Texas, United States of America
| | - Steven J. Norris
- Department of Pathology & Laboratory Medicine, McGovern Medical School, University of Texas Health Science Center, Houston, Texas, United States of America
- Department of Microbiology & Molecular Genetics, McGovern Medical School, University of Texas Health Science Center, Houston, Texas, United States of America
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Karanfilian KM, Almohssen AA, Kapila R, Schwartz RA. Malignant syphilis: a new and revised definition. Int J Dermatol 2023; 62:369-375. [PMID: 36250867 DOI: 10.1111/ijd.16444] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Revised: 08/07/2022] [Accepted: 09/22/2022] [Indexed: 12/01/2022]
Abstract
Malignant syphilis is a rare, severe variant of secondary syphilis that primarily affects immunocompromised patients. Historically, the clinical presentation included a prodrome of constitutional symptoms followed by the development of characteristic skin lesions. The definition of malignant syphilis has not been updated since it was first described as only a cutaneous manifestation. In recent years, syphilis has reemerged as a major public health issue, particularly in men who have sex with men (MSM) and patients with HIV. With increasing rates of syphilis in the HIV-positive population, the systemic manifestations of malignant syphilis have become more apparent. We propose a revised definition and elucidate why the term malignant syphilis should be expanded to include systemic manifestations, stressing musculoskeletal, central nervous system, ocular, ear, cardiovascular, rectal, liver, lung, and renal involvement. This updated definition is dramatically expanded to reflect its systemic manifestations. Recognition of these manifestations may prevent devastating long-term effects.
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Affiliation(s)
| | | | - Rajendra Kapila
- Infectious Disease, Rutgers New Jersey Medical School, Newark, NJ, USA
| | - Robert A Schwartz
- Dermatology and Pathology, Rutgers New Jersey Medical School, Newark, NJ, USA
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Kurniyati K, Chang Y, Guo W, Liu J, Malkowski MG, Li C. Anti-σ 28 Factor FlgM Regulates Flagellin Gene Expression and Flagellar Polarity of Treponema denticola. J Bacteriol 2023; 205:e0046322. [PMID: 36715541 PMCID: PMC9945498 DOI: 10.1128/jb.00463-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 01/07/2023] [Indexed: 01/31/2023] Open
Abstract
FlgM, an antagonist of FliA (also known as σ28), inhibits transcription of bacterial class 3 flagellar genes. It does so primarily through binding to free σ28 to prevent it from forming a complex with core RNA polymerase. We recently identified an FliA homolog (FliATd) in the oral spirochete Treponema denticola; however, its antagonist FlgM remained uncharacterized. Herein, we provide several lines of evidence that TDE0201 functions as an antagonist of FliATd. TDE0201 is structurally similar to FlgM proteins, although its sequence is not conserved. Heterologous expression of TDE0201 in Escherichia coli inhibits its flagellin gene expression and motility. Biochemical and mutational analyses demonstrate that TDE0201 binds to FliATd and prevents it from binding to the σ28-dependent promoter. Deletions of flgM genes typically enhance bacterial class 3 flagellar gene expression; however, deletion of TDE0201 has an opposite effect (e.g., the mutant has a reduced level of flagellins). Follow-up studies revealed that deletion of TDE0201 leads to FliATd turnover, which in turn impairs the expression of flagellin genes. Swimming plate, cell tracking, and cryo-electron tomography analyses further disclosed that deletion of TDE0201 impairs spirochete motility and alters flagellar number and polarity: i.e., instead of having bipolar flagella, the mutant has flagella only at one end of cells. Collectively, these results indicate that TDE0201 is a FlgM homolog but acts differently from its counterparts in other bacteria. IMPORTANCE Spirochetes are a group of bacteria that cause several human diseases. A unique aspect of spirochetes is that they have bipolar periplasmic flagella (PFs), which bestow on the spirochetes a unique spiral shape and distinct swimming behaviors. While the structure and function of PFs have been extensively studied in spirochetes, the molecular mechanism that regulates the PFs' morphogenesis and assembly is poorly understood. In this report, FlgM, an anti-σ28 factor, is identified and functionally characterized in the oral spirochete Treponema denticola. Our results show that FlgM regulates the number and polarity of PFs via a unique mechanism. Identification of FliA and FlgM in T. denticola sets a benchmark to investigate their roles in other spirochetes.
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Affiliation(s)
- Kurni Kurniyati
- Department of Oral Craniofacial Molecular Biology, Virginia Commonwealth University, Richmond, Virginia, USA
- Department of Microbiology and Immunology, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Yunjie Chang
- Department of Microbial Pathogenesis, Yale University, School of Medicine, New Haven, Connecticut, USA
- Microbial Sciences Institute, Yale University, School of Medicine, New Haven, Connecticut, USA
| | - Wangbiao Guo
- Department of Microbial Pathogenesis, Yale University, School of Medicine, New Haven, Connecticut, USA
- Microbial Sciences Institute, Yale University, School of Medicine, New Haven, Connecticut, USA
| | - Jun Liu
- Department of Microbial Pathogenesis, Yale University, School of Medicine, New Haven, Connecticut, USA
- Microbial Sciences Institute, Yale University, School of Medicine, New Haven, Connecticut, USA
| | - Michael G. Malkowski
- Department of Structural Biology, Jacobs School of Medicine and Biomedical Sciences, University of Buffalo, Buffalo, New York, USA
| | - Chunhao Li
- Department of Oral Craniofacial Molecular Biology, Virginia Commonwealth University, Richmond, Virginia, USA
- Department of Microbiology and Immunology, Virginia Commonwealth University, Richmond, Virginia, USA
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Transcriptome-wide assessment of N6-methyladenosine modification identifies different gene expression and infection-associated pathways in Treponema pallidum-infected macrophage. J Dermatol Sci 2023; 109:108-116. [PMID: 36841722 DOI: 10.1016/j.jdermsci.2023.02.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2022] [Revised: 12/18/2022] [Accepted: 02/16/2023] [Indexed: 02/21/2023]
Abstract
BACKGROUND Treponema pallidum (Tp) is a widespread and destructive pathogen that leads to syphilis. As the acknowledged executor of host immunity, macrophage plays vital roles in combating the invasion and migration of Tp. However, the mechanisms of these processes are largely unknown, especially the critical driver genes and associated modifications. OBJECTIVE We aimed to systematically dissect the global N6-methyladenosine (m6A) RNA modification patterns in Tp-infected macrophages. METHODS The RNA of Tp-infected/non-infected macrophage was extracted, followed by mRNA sequencing and methylated RNA immunoprecipitation (MeRIP) sequencing. Bioinformatics analysis was executed by m6A peaks and motifs identification, Gene ontology and signaling pathways analysis of differentially expressed genes, and comprehensive comparison. The m6A levels were measured by RNA Methylation Assay, and m6A modified genes were determined by qPCR. RESULTS Totally, 2623 unique and 3509 common m6A peaks were proved along with related transcripts in Tp-infected macrophages. The common m6A-related genes were enriched in the signals of oxidative stress, cell differentiation, and angiogenesis, while unique genes in those of metabolism, inflammation, and infection. And differentially expressed transcripts revealed various biological processes and pathways associated with catabolic and infection. They also experienced comprehensive analysis due to hyper-/hypo-methylation. And the m6A level of macrophage was elevated, along with qPCR validation of specific genes. CONCLUSION With a particular m6A transcriptome-wide map, our study provides unprecedented insights into the RNA modification of macrophage stimulated by Tp in vitro, which partially differs from other infections and may provide clues to explore the immune process for syphilis.
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Cantisani C, Rega F, Ambrosio L, Grieco T, Kiss N, Meznerics FA, Bánvölgyi A, Vespasiani G, Arienzo F, Rossi G, Soda G, Pellacani G. Syphilis, the Great Imitator-Clinical and Dermoscopic Features of a Rare Presentation of Secondary Syphilis. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:1339. [PMID: 36674095 PMCID: PMC9859468 DOI: 10.3390/ijerph20021339] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 01/04/2023] [Accepted: 01/09/2023] [Indexed: 06/17/2023]
Abstract
Syphilis is characterized by a wide range of variable clinical symptoms; therefore, it is often referred to as "The Great Imitator". Here, we report the case of a 69-year-old hepatitis-C-positive MSM patient, who was admitted to our clinic due to a solitary firm painless erythematous maculopapular lesion with a central crater-like crust on the upper right thigh that occurred two months prior. The dermoscopy showed an erythematous, copper-colored, oval lesion with diffuse monomorphic dotted and glomerular vessels, central crust, and circular scaling (Biett's sign). The histological findings ruled out neoplasia and described a plasma cell infiltrate and endothelial swelling. Finally, the combination of the dermoscopic image, histological findings and the additionally acquired knowledge about the sexual history of the patient at the second visit led to the diagnosis, which was then confirmed with serological tests. Dermoscopy may become a supportive tool to facilitate the recognition of secondary syphilis; however, the reporting of these atypical cases is crucial to highlight the many faces of the disease so that clinicians consider syphilis as part of the differential diagnosis of non-specific lesions.
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Affiliation(s)
- Carmen Cantisani
- Dermatology Unit, Department of Clinical Internal Anesthesiologic Cardiovascular Sciences, “Sapienza Medical School” University of Rome, 00185 Rome, Italy
| | - Federica Rega
- Dermatology Unit, Department of Clinical Internal Anesthesiologic Cardiovascular Sciences, “Sapienza Medical School” University of Rome, 00185 Rome, Italy
| | - Luca Ambrosio
- Dermatology Unit, Department of Clinical Internal Anesthesiologic Cardiovascular Sciences, “Sapienza Medical School” University of Rome, 00185 Rome, Italy
| | - Teresa Grieco
- Dermatology Unit, Department of Clinical Internal Anesthesiologic Cardiovascular Sciences, “Sapienza Medical School” University of Rome, 00185 Rome, Italy
| | - Norbert Kiss
- Department of Dermatology, Venereoslogy and Dermatooncology, Semmelweis University, H-1085 Budapest, Hungary
| | - Fanni Adél Meznerics
- Department of Dermatology, Venereoslogy and Dermatooncology, Semmelweis University, H-1085 Budapest, Hungary
| | - András Bánvölgyi
- Department of Dermatology, Venereoslogy and Dermatooncology, Semmelweis University, H-1085 Budapest, Hungary
| | - Giordano Vespasiani
- Dermatology Unit, Department of Clinical Internal Anesthesiologic Cardiovascular Sciences, “Sapienza Medical School” University of Rome, 00185 Rome, Italy
| | - Francesca Arienzo
- Department of Radiological, Oncological and Pathological Sciences, “Sapienza Medical School” University of Rome, 00161 Rome, Italy
| | - Giovanni Rossi
- Dermatology Unit, Department of Clinical Internal Anesthesiologic Cardiovascular Sciences, “Sapienza Medical School” University of Rome, 00185 Rome, Italy
| | - Giuseppe Soda
- Department of Radiological, Oncological and Pathological Sciences, “Sapienza Medical School” University of Rome, 00161 Rome, Italy
| | - Giovanni Pellacani
- Dermatology Unit, Department of Clinical Internal Anesthesiologic Cardiovascular Sciences, “Sapienza Medical School” University of Rome, 00185 Rome, Italy
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Isler MF, Hoskins S, Esparza EM, Ruhoy SM. Syphilitic Folliculitis: A Case Report With Demonstration of Spirochetes Showing Follicular Epitheliotropism. Am J Dermatopathol 2022; 44:837-839. [PMID: 35925589 DOI: 10.1097/dad.0000000000002260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
ABSTRACT We report a case of a 59-year-old man presenting with a widespread follicular-based papular rash with a several-month history of myalgias, lymphadenopathy, fatigue, and weight loss who was diagnosed with acute syphilitic folliculitis by tissue biopsy analysis with immunohistochemical demonstration of spirochetes in hair follicle epithelium. Serologic analysis also showed evidence of Treponema sp. infection. Owing to the rising number of syphilis cases in the last decade, it is important to recognize classic cutaneous findings of syphilis in addition to unusual presentations such as syphilitic folliculitis.
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Affiliation(s)
| | - Sidney Hoskins
- Division of Dermatology, University of Washington, Seattle, WA
| | - Edward M Esparza
- Department of Dermatology, Virginia Mason Medical Center, Seattle, WA; and
| | - Steven M Ruhoy
- Department of Pathology, Virginia Mason Medical Center, Seattle, WA
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45
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Luo Y, Xie Y, Chen J, Zhou J, Zhao F, Liu S, Zeng T, Xu M, Xiao Y. Treponema pallidum FlaA2 inducing the release of pro-inflammatory cytokines is mediated via TLR2 in keratinocytes. Microb Pathog 2022; 173:105879. [DOI: 10.1016/j.micpath.2022.105879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 11/01/2022] [Accepted: 11/09/2022] [Indexed: 11/14/2022]
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46
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Tang Y, Zhou Y, He B, Cao T, Zhou X, Ning L, Chen E, Li Y, Xie X, Peng B, Hu Y, Liu S. Investigation of the immune escape mechanism of Treponema pallidum. Infection 2022; 51:305-321. [PMID: 36260281 DOI: 10.1007/s15010-022-01939-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 10/07/2022] [Indexed: 11/25/2022]
Abstract
BACKGROUND Syphilis is a chronic sexually transmitted disease caused by Treponema pallidum subspecies pallidum (T. pallidum), which is a public health problem that seriously affects human health worldwide. T. pallidum is characterized by early transmission and immune escape and is therefore termed an "invisible pathogen". METHODS This review systematically summarizes the host's innate and adaptive immune responses to T. pallidum infection as well as the escape mechanisms of T. pallidum. PURPOSE To lay the foundation for assessing the pathogenic mechanism and the systematic prevention and treatment of syphilis. CONCLUSION The immune escape mechanism of T. pallidum plays an important role in its survival. Exploring the occurrence and development of these mechanisms has laid the foundation for the development of syphilis vaccine.
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Affiliation(s)
- Yun Tang
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Yingjie Zhou
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Bisha He
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Ting Cao
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Xiangping Zhou
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Lichang Ning
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - En Chen
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Yumeng Li
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Xiaoping Xie
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Binfeng Peng
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Yibao Hu
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China
| | - Shuangquan Liu
- Department of Clinical Laboratory Medicine, Institution of Microbiology and Infectious Diseases, Hengyang Medical School, The First Affiliated Hospital, University of South China, No. 69, Chuanshan Road, Hengyang City, 421000, Hunan, China.
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Morando N, Vrbová E, Melgar A, Rabinovich RD, Šmajs D, Pando MA. High frequency of Nichols-like strains and increased levels of macrolide resistance in Treponema pallidum in clinical samples from Buenos Aires, Argentina. Sci Rep 2022; 12:16339. [PMID: 36175452 PMCID: PMC9522787 DOI: 10.1038/s41598-022-20410-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Accepted: 09/13/2022] [Indexed: 11/16/2022] Open
Abstract
Globally, 94% of Treponema pallidum subsp. pallidum (TPA) clinical strains belong to the SS14-like group and 6% to the Nichols-like group, with a prevalence of macrolide resistance of 90%. Our goal was to determine whether local TPA strain distribution and macrolide resistance frequency have changed significantly since our last report, which revealed that Buenos Aires had a high frequency of Nichols-like strains (27%) and low levels of macrolide resistance (14%). Swab samples from patients with suspected syphilis were collected during 2015–2019 and loci TP0136, TP0548, TP0705 were sequenced in order to perform multilocus sequence typing. Strains were classified as Nichols-like or SS14-like. The presence of macrolide resistance-associated mutations was determined by examination of the 23S rDNA gene sequence. Of 46 typeable samples, 37% were classified as Nichols-like and 63% as SS14-like. Macrolide resistance prevalence was 45.7%. Seven allelic profiles were found, five were SS14-like and two were Nichols-like. The frequency of Nichols-like strains increased between studies (26.8% vs. 37%, p = 0.36). A dramatic increase was found in the frequency of macrolide resistant strains between studies (14.3% vs. 45.7%, p = 0.005). Our results are in agreement with international trends and underscore the need to pursue further TPA molecular typing studies in South America.
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Affiliation(s)
- Nicolas Morando
- CONICET-Universidad de Buenos Aires, Instituto de Investigaciones Biomédicas en Retrovirus y Sida (INBIRS), Buenos Aires, Argentina
| | - Eliška Vrbová
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - Asunta Melgar
- Programa de Enfermedades de Transmisión Sexual (PETS), Hospital de Clínicas "José de San Martín", Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Roberto Daniel Rabinovich
- CONICET-Universidad de Buenos Aires, Instituto de Investigaciones Biomédicas en Retrovirus y Sida (INBIRS), Buenos Aires, Argentina
| | - David Šmajs
- Department of Biology, Faculty of Medicine, Masaryk University, Brno, Czech Republic
| | - María A Pando
- CONICET-Universidad de Buenos Aires, Instituto de Investigaciones Biomédicas en Retrovirus y Sida (INBIRS), Buenos Aires, Argentina.
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Identification and Characterization of the Alternative σ 28 Factor in Treponema denticola. J Bacteriol 2022; 204:e0024822. [PMID: 36043861 PMCID: PMC9487585 DOI: 10.1128/jb.00248-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
FliA (also known as σ28), a member of the bacterial σ70 family of transcription factors, directs RNA polymerase to flagellar late (class 3) promoters and initiates transcription. FliA has been studied in several bacteria, yet its role in spirochetes has not been established. In this report, we identify and functionally characterize a FliA homolog (TDE2683) in the oral spirochete Treponema denticola. Computational, genetic, and biochemical analyses demonstrated that TDE2683 has a structure similar to that of the σ28 of Escherichia coli, binds to σ28-dependent promoters, and can functionally replace the σ28 of E. coli. However, unlike its counterparts from other bacteria, TDE2683 cannot be deleted, suggesting its essential role in the survival of T. denticola. In vitro site-directed mutagenesis revealed that E221 and V231, two conserved residues in the σ4 region of σ28, are indispensable for the binding activity of TDE2683 to the σ28-dependent promoter. We then mutated these two residues in T. denticola and found that the mutations impair the expression of flagellin and chemotaxis genes and bacterial motility as well. Cryo-electron tomography analysis further revealed that the mutations disrupt the flagellar symmetry (i.e., number and placement) of T. denticola. Collectively, these results indicate that TDE2683 is a σ28 transcription factor that regulates the class 3 gene expression and controls the flagellar symmetry of T. denticola. To the best of our knowledge, this is the first report establishing the functionality of FliA in spirochetes. IMPORTANCE Spirochetes are a group of medically important but understudied bacteria. One of the unique aspects of spirochetes is that they have periplasmic flagella (PF, also known as endoflagella) which give rise to their unique spiral shape and distinct swimming behaviors and play a critical role in the pathophysiology of spirochetes. PF are structurally similar to external flagella, but the underpinning mechanism that regulates PF biosynthesis and assembly remains largely unknown. By using the oral spirochete Treponema denticola as a model, this report provides several lines of evidence that FliA, a σ28 transcriptional factor, regulates the late flagellin gene (class 3) expression, PF assembly, and flagellar symmetry as well, which provides insights into flagellar regulation and opens an avenue to investigate the role of σ28 in spirochetes.
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Wenner B, Park T, Mitchell K, Kvidera S, Griswold K, Horst E, Baumgard L. Effect of zinc source (zinc sulfate or zinc hydroxychloride) on relative abundance of fecal Treponema spp. in lactating dairy cows. JDS COMMUNICATIONS 2022; 3:334-338. [PMID: 36340900 PMCID: PMC9623701 DOI: 10.3168/jdsc.2022-0238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 05/23/2022] [Indexed: 11/29/2022]
Abstract
Cows (n = 24) were fed typical lactating diets that only differed in zinc source inclusion. Fecal samples collected from cows were extracted for prokaryotic 16S gene DNA. Feeding zinc hydroxychloride decreased the Treponema spp. recovered from fecal samples compared with cows fed zinc sulfate.
Previous research revealed a potential effect of dietary trace mineral source on both ruminal and fecal microbiota. However, the effect of Zn source, specifically, has not previously been considered. Based on reported postruminal solubility, we hypothesized that Zn hydroxychloride would decrease Treponema spp. fecal excretion relative to cows fed Zn sulfate. To test this hypothesis, lactating Holstein cows (n = 24; 685 ± 9 kg of body weight; 159 ± 8 d in milk; parity 3 ± 0.2) were randomly assigned to 1 of 2 dietary treatments: control (75 mg/kg Zn from ZnSO4) or Zn hydroxychloride (HYD; 75 mg/kg IntelliBond Z; Micronutrients USA LLC). Single fecal grab samples were collected on d 1 before dietary treatments and on d 27 after dietary treatments were applied. Fecal microbial DNA was extracted and sequenced to establish taxonomy using a universal primer for the 16S rRNA gene. Supplementation of HYD decreased the relative abundance of Treponema 2 by 3-fold (14.7% vs. 4.9%). Poor sequencing resolution at the species level limited inference of Treponema spp. toward management or gut health implications of HYD supplementation. However, the inclusion of pathogenic species among Treponema spp. indicates a potential implication of HYD feeding to reduce environmental exposure of the dairy cow to Treponema spp.
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Affiliation(s)
- B.A. Wenner
- Department of Animal Sciences, The Ohio State University, Columbus 43210
- Corresponding author
| | - T. Park
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Gyeonggi-do, Korea
| | - K. Mitchell
- Department of Animal Sciences, The Ohio State University, Columbus 43210
| | | | | | - E.A. Horst
- Department of Animal Science, Iowa State University, Ames 50011
| | - L.H. Baumgard
- Department of Animal Science, Iowa State University, Ames 50011
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Kurniyati K, Chang Y, Liu J, Li C. Transcriptional and functional characterizations of multiple flagellin genes in spirochetes. Mol Microbiol 2022; 118:175-190. [PMID: 35776658 PMCID: PMC9481697 DOI: 10.1111/mmi.14959] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2022] [Revised: 06/28/2022] [Accepted: 06/28/2022] [Indexed: 11/28/2022]
Abstract
The flagellar filament is a helical propeller for bacterial locomotion. In external flagellates, the filaments are mostly homopolymers of a single flagellin protein. By contrast, the flagellar filaments of spirochetes are mostly heteropolymers of multiple flagellin proteins. This report seeks to investigate the role of multiple flagellin proteins using the oral spirochete Treponema denticola as a model. First, biochemical and genetic studies uncover that the flagellar filaments of T. denticola mainly comprise four proteins, FlaA, FlaB1, FlaB2, and FlaB3, in a defined stoichiometry. Second, transcriptional analyses reveal that the genes encoding these four proteins are regulated by two different transcriptional factors, sigma28 and sigma70 . Third, loss-of-function studies demonstrate that each individual flagellin protein contributes to spirochete motility, but none of them is absolutely required. Last, we provide genetic and structural evidence that FlaA forms a "seam"-like structure around the core and that deletion of individual flagellin protein alters the flagellar homeostasis. Collectively, these results demonstrate that T. denticola has evolved a unique mechanism to finely regulate its flagellar filament gene expression and assembly which renders the organelle with the right number, shape, strength, and structure for its distinct motility.
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Affiliation(s)
- Kurni Kurniyati
- Department of Oral Craniofacial Molecular Biology, School of DentistryVirginia Commonwealth UniversityRichmondVirginiaUSA
| | - Yunjie Chang
- Microbial Sciences InstituteYale UniversityWest HavenConnecticutUSA
- Department of Microbial PathogenesisYale School of MedicineNew HavenConnecticutUSA
| | - Jun Liu
- Microbial Sciences InstituteYale UniversityWest HavenConnecticutUSA
- Department of Microbial PathogenesisYale School of MedicineNew HavenConnecticutUSA
| | - Chunhao Li
- Department of Oral Craniofacial Molecular Biology, School of DentistryVirginia Commonwealth UniversityRichmondVirginiaUSA
- Department of Microbiology and Immunology, School of MedicineVirginia Commonwealth UniversityRichmondVirginiaUSA
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