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Téblick L, Lipovac M, Molenberghs F, Delputte P, De Vos WH, Vorsters A. HPV-specific antibodies in female genital tract secretions captured via first-void urine retain their neutralizing capacity. Hum Vaccin Immunother 2024; 20:2330168. [PMID: 38567541 PMCID: PMC10993920 DOI: 10.1080/21645515.2024.2330168] [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: 02/15/2024] [Accepted: 03/11/2024] [Indexed: 04/04/2024] Open
Abstract
Human papillomavirus (HPV) vaccines, primarily relying on neutralizing antibodies, have proven highly effective. Recently, HPV-specific antibodies have been detected in the female genital tract secretions captured by first-void urine (FVU), offering a minimally invasive diagnostic approach. In this study, we investigated whether HPV16-specific antibodies present in FVU samples retain their neutralizing capacity by using pseudovirion-based neutralization assays. Paired FVU and serum samples (vaccinated n = 25, unvaccinated n = 25, aged 18-25) were analyzed using two orthogonal pseudovirion-based neutralization assays, one using fluorescence microscopy and the other using luminescence-based spectrophotometry. Results were compared with HPV16-specific IgG concentrations and correlations between neutralizing antibodies in FVU and serum were explored. The study demonstrated the presence of neutralizing antibodies in FVU using both pseudovirion-based neutralization assays, with the luminescence-based assay showing higher sensitivity for FVU samples, while the fluorescence microscopy-based assay exhibited better specificity for serum and overall higher reproducibility. High Spearman correlation values were calculated between HPV16-IgG and HPV16-neutralizing antibodies for both protocols (rs: 0.54-0.94, p < .001). Significant Spearman correlations between FVU and serum concentrations were also established for all assays (rs: 0.44-0.91, p < .01). This study demonstrates the continued neutralizing ability of antibodies captured with FVU, supporting the hypothesis that HPV vaccination may reduce autoinoculation and transmission risk to the sexual partner. Although further protocol optimizations are warranted, these findings provide a foundation for future research and larger cohort studies that could have implications for the optimal design, evaluation, and implementation of HPV vaccination programs.
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Affiliation(s)
- Laura Téblick
- Centre for the Evaluation of Vaccination, Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Marijana Lipovac
- Centre for the Evaluation of Vaccination, Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
| | - Freya Molenberghs
- Laboratory of Cell Biology and Histology, University of Antwerp, Antwerp, Belgium
| | - Peter Delputte
- Laboratory for Microbiology, Parasitology and Hygiene, University of Antwerp, Antwerp, Belgium
| | - Winnok H. De Vos
- Laboratory of Cell Biology and Histology, University of Antwerp, Antwerp, Belgium
- Antwerp Centre for Advanced Microscopy, University of Antwerp, Antwerp, Belgium
- µNEURO Centre of Research Excellence, University of Antwerp, Antwerp, Belgium
| | - Alex Vorsters
- Centre for the Evaluation of Vaccination, Vaccine & Infectious Disease Institute, University of Antwerp, Antwerp, Belgium
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2
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Molenberghs F, Verschuuren M, Vandeweyer L, Peeters S, Bogers JJ, Novo CP, Vanden Berghe W, De Reu H, Cools N, Schelhaas M, De Vos WH. Lamin B1 curtails early human papillomavirus infection by safeguarding nuclear compartmentalization and autophagic capacity. Cell Mol Life Sci 2024; 81:141. [PMID: 38485766 PMCID: PMC10940392 DOI: 10.1007/s00018-024-05194-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 02/21/2024] [Accepted: 03/01/2024] [Indexed: 03/18/2024]
Abstract
Human papillomavirus (HPV) infection is a primary cause of cervical and head-and-neck cancers. The HPV genome enters the nucleus during mitosis when the nuclear envelope disassembles. Given that lamins maintain nuclear integrity during interphase, we asked to what extent their loss would affect early HPV infection. To address this question, we infected human cervical cancer cells and keratinocytes lacking the major lamins with a HPV16 pseudovirus (HP-PsV) encoding an EGFP reporter. We found that a sustained reduction or complete loss of lamin B1 significantly increased HP-PsV infection rate. A corresponding greater nuclear HP-PsV load in LMNB1 knockout cells was directly related to their prolonged mitotic window and extensive nuclear rupture propensity. Despite the increased HP-PsV presence, EGFP transcript levels remained virtually unchanged, indicating an additional defect in protein turnover. Further investigation revealed that LMNB1 knockout led to a substantial decrease in autophagic capacity, possibly linked to the persistent activation of cGAS by cytoplasmic chromatin exposure. Thus, the attrition of lamin B1 increases nuclear perviousness and attenuates autophagic capacity, creating an environment conducive to unrestrained accumulation of HPV capsids. Our identification of lower lamin B1 levels and nuclear BAF foci in the basal epithelial layer of several human cervix samples suggests that this pathway may contribute to an increased individual susceptibility to HPV infection.
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Affiliation(s)
- Freya Molenberghs
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
| | - Marlies Verschuuren
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
| | - Lauran Vandeweyer
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
| | - Sarah Peeters
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
| | - Johannes J Bogers
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium
| | - Claudina Perez Novo
- Cell Death Signaling Lab, Integrated Personalized and Precision Oncology Network (IPPON), Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Wim Vanden Berghe
- Cell Death Signaling Lab, Integrated Personalized and Precision Oncology Network (IPPON), Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Hans De Reu
- Laboratory of Experimental Hematology, Faculty Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Nathalie Cools
- Laboratory of Experimental Hematology, Faculty Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Mario Schelhaas
- Institute of Cellular Virology, University of Münster, Münster, Germany
| | - Winnok H De Vos
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Universiteitsplein 1, 2610, Antwerp, Belgium.
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3
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Molenberghs F, Verschuuren M, Barbier M, Bogers JJ, Cools N, Delputte P, Schelhaas M, De Vos WH. Cells infected with human papilloma pseudovirus display nuclear reorganization and heterogenous infection kinetics. Cytometry A 2022; 101:1035-1048. [PMID: 35668549 DOI: 10.1002/cyto.a.24663] [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] [Received: 01/17/2022] [Revised: 03/12/2022] [Accepted: 06/02/2022] [Indexed: 01/27/2023]
Abstract
Human papillomaviruses (HPV) are small, non-enveloped DNA viruses, which upon chronic infection can provoke cervical and head-and-neck cancers. Although the infectious life cycle of HPV has been studied and a vaccine is available for the most prevalent cancer-causing HPV types, there are no antiviral agents to treat infected patients. Hence, there is a need for novel therapeutic entry points and a means to identify them. In this work, we have used high-content microscopy to quantitatively investigate the early phase of HPV infection. Human cervical cancer cells and immortalized keratinocytes were exposed to pseudoviruses (PsV) of the widespread HPV type 16, in which the viral genome was replaced by a pseudogenome encoding a fluorescent reporter protein. Using the fluorescent signal as readout, we measured differences in infection between cell lines, which directly correlated with host cell proliferation rate. Parallel multiparametric analysis of nuclear organization revealed that HPV PsV infection alters nuclear organization and inflates promyelocytic leukemia protein body content, positioning these events at the early stage of HPV infection, upstream of viral replication. Time-resolved analysis revealed a marked heterogeneity in infection kinetics even between two daughter cells, which we attribute to differences in viral load. Consistent with the requirement for mitotic nuclear envelope breakdown, pharmacological inhibition of the cell cycle dramatically blunted infection efficiency. Thus, by systematic image-based single cell analysis, we revealed phenotypic alterations that accompany HPV PsV infection in individual cells, and which may be relevant for therapeutic drug screens.
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Affiliation(s)
- Freya Molenberghs
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Marlies Verschuuren
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Michaël Barbier
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Antwerp, Belgium.,Simply Complex Lab, UNAM, Bilkent University, Ankara, Turkey
| | - Johannes J Bogers
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Nathalie Cools
- Laboratory of Experimental Hematology, Faculty Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Peter Delputte
- Laboratory of Microbiology, Parasitology and Hygiene, Department of Biomedical Sciences, University of Antwerp, Antwerp, Belgium
| | - Mario Schelhaas
- Institute of Cellular Virology, University of Münster, Münster, Germany
| | - Winnok H De Vos
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences and Health Sciences, University of Antwerp, Antwerp, Belgium.,Antwerp Centre for Advanced Microscopy (ACAM), University of Antwerp, Antwerp, Belgium.,μNEURO Research Centre of Excellence, University of Antwerp, Antwerp, Belgium
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4
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Inalegwu A, Cuypers B, Claesen J, Janssen A, Coolkens A, Baatout S, Laukens K, De Vos WH, Quintens R. Fractionated irradiation of MCF7 breast cancer cells rewires a gene regulatory circuit towards a treatment-resistant stemness phenotype. Mol Oncol 2022; 16:3410-3435. [PMID: 35579852 PMCID: PMC9533694 DOI: 10.1002/1878-0261.13226] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 04/07/2022] [Accepted: 05/05/2022] [Indexed: 11/10/2022] Open
Abstract
Radiotherapy is the standard of care for breast cancer. However, surviving radioresistant cells can repopulate following treatment and provoke relapse. Better understanding of the molecular mechanisms of radiation resistance may help improve treatment of radioresistant tumors. To emulate radiation therapy at the cellular level, we exposed MCF7 breast cancer cells to daily radiation doses of 2 Gy up to an accumulated dose of 20 Gy. Fractionally irradiated cells (FIR20) displayed increased clonogenic survival and population doubling time as compared to age-matched sham-irradiated cells and untreated parental MCF7 cells. RNA-sequencing revealed a core signature of 229 mRNAs and 7 circular RNAs of which the expression was significantly altered in FIR20 cells. Dysregulation of several top genes was mirrored at the protein level. The FIR20 cell transcriptome overlapped significantly with canonical radiation response signatures and demonstrated a remarkable commonality with radiation and endocrine therapy resistance expression profiles, suggesting crosstalk between both acquired resistance pathways, as indicated by reduced sensitivity to tamoxifen cytotoxicity of FIR20 cells. Using predictive analyses and functional enrichment, we identified a gene-regulatory network that promotes stemness and inflammatory signaling in FIR20 cells. We propose that these phenotypic traits render breast cancer cells more radioresistant but may at the same time serve as potential targets for combination therapies.
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Affiliation(s)
- Auchi Inalegwu
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium.,Department of Veterinary Sciences, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, 2610, Antwerp, Belgium.,Adrem Data Lab, Department of Computer Science, University of Antwerp, 2020, Antwerp, Belgium.,Department of Biomedical Sciences, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, 2610, Antwerp, Belgium
| | - Bart Cuypers
- Adrem Data Lab, Department of Computer Science, University of Antwerp, 2020, Antwerp, Belgium
| | - Jürgen Claesen
- Department of Epidemiology and Data Science, Amsterdam UMC, VU, Amsterdam, Netherlands
| | - Ann Janssen
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
| | - Amelie Coolkens
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
| | - Sarah Baatout
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
| | - Kris Laukens
- Adrem Data Lab, Department of Computer Science, University of Antwerp, 2020, Antwerp, Belgium
| | - Winnok H De Vos
- Department of Veterinary Sciences, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, 2610, Antwerp, Belgium.,Antwerp Centre for Advanced Microscopy (ACAM), University of Antwerp, Antwerp, Belgium.,µNEURO Research Centre of Excellence, University of Antwerp, Antwerp, Belgium
| | - Roel Quintens
- Radiobiology Unit, SCK CEN, Belgian Nuclear Research Centre, 2400, Mol, Belgium
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Transient nuclear lamin A/C accretion aids in recovery from vapor nanobubble-induced permeabilisation of the plasma membrane. Cell Mol Life Sci 2022; 79:23. [PMID: 34984553 PMCID: PMC8727414 DOI: 10.1007/s00018-021-04099-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 11/23/2021] [Accepted: 12/15/2021] [Indexed: 01/14/2023]
Abstract
Vapor nanobubble (VNB) photoporation is a physical method for intracellular delivery that has gained significant interest in the past decade. It has successfully been used to introduce molecular cargo of diverse nature into different cell types with high throughput and minimal cytotoxicity. For translational purposes, it is important to understand whether and how photoporation affects cell homeostasis. To obtain a comprehensive view on the transcriptional rewiring that takes place after VNB photoporation, we performed a longitudinal shotgun RNA-sequencing experiment. Six hours after photoporation, we found a marked upregulation of LMNA transcripts as well as their protein products, the A-type lamins. At the same time point, we observed a significant increase in several heterochromatin marks, suggesting a global stiffening of the nucleus. These molecular features vanished 24 h after photoporation. Since VNB-induced chromatin condensation was prolonged in LMNA knockout cells, A-type lamins may be required for restoring the nucleus to its original state. Selective depletion of A-type lamins reduced cell viability after VNB photoporation, while pharmacological stimulation of LMNA transcription increased the percentage of successfully transfected cells that survived after photoporation. Therefore, our results suggest that cells respond to VNB photoporation by temporary upregulation of A-type lamins to facilitate their recovery.
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De Puysseleyr L, De Puysseleyr K, Rybarczyk J, Vander Donck P, De Vos WH, Vanrompay D. Transferrins Reduce Replication of Chlamydia suis in McCoy Cells. Pathogens 2021; 10:pathogens10070858. [PMID: 34358007 PMCID: PMC8308531 DOI: 10.3390/pathogens10070858] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 07/02/2021] [Accepted: 07/04/2021] [Indexed: 11/25/2022] Open
Abstract
Chlamydia suis (C. suis) resides in the intestines of pigs and tetracycline-resistant strains are emerging worldwide. Intestinal infections are often subclinical. However, the gut is regarded as a C. suis reservoir and clinical infections have been associated with enteritis, conjunctivitis, pneumonia and reproductive failure. C. suis was found in boar semen and venereal transmission occurred. We studied the anti-Chlamydia suis activity of ovotransferrin (ovoTF) and bovine lactoferrin (bLF). Pre-incubation of C. suis with bLF or ovoTF had no significant effect on overall chlamydia replication (mean fluorescence area) in McCoy cells. The addition of ovoTF to the culture medium had no effect on bacterial replication, but the addition of 0.5 or 5 mg/mL of bLF significantly reduced the inclusion size by 17% and 15% respectively. Egg components are used for cryopreservation of boar semen. When inoculating an ovoTF-containing and Chlamydia suis-spiked semen sample in McCoy cells, a significant reduction in inclusion number (by 7%) and overall replication (by 11%) was observed. Thus, we showed that transferrins possess anti-chlamydial activity. Moreover, ovoTF addition to semen extenders might reduce C. suis venereal transmission. Further research is needed to unravel the mechanisms behind the observations and to enhance the effect of transferrins on C. suis.
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Affiliation(s)
- Leentje De Puysseleyr
- Laboratory for Immunology and Animal Biotechnology, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; (L.D.P.); (K.D.P.); (J.R.); (P.V.D.)
| | - Kristien De Puysseleyr
- Laboratory for Immunology and Animal Biotechnology, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; (L.D.P.); (K.D.P.); (J.R.); (P.V.D.)
| | - Joanna Rybarczyk
- Laboratory for Immunology and Animal Biotechnology, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; (L.D.P.); (K.D.P.); (J.R.); (P.V.D.)
| | - Paulien Vander Donck
- Laboratory for Immunology and Animal Biotechnology, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; (L.D.P.); (K.D.P.); (J.R.); (P.V.D.)
| | - Winnok H. De Vos
- Laboratory of Cell Biology and Histology, Faculty of Pharmaceutical, Biomedical and Veterinary Sciences, University of Antwerp, 2610 Wilrijk, Belgium;
| | - Daisy Vanrompay
- Laboratory for Immunology and Animal Biotechnology, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; (L.D.P.); (K.D.P.); (J.R.); (P.V.D.)
- Correspondence:
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Kieckens E, Van den Broeck L, Van Gils M, Morré S, Vanrompay D. Co-Occurrence of Chlamydia suis DNA and Chlamydia suis-Specific Antibodies in the Human Eye. Vector Borne Zoonotic Dis 2018; 18:677-682. [PMID: 30251925 DOI: 10.1089/vbz.2017.2256] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Chlamydia suis is a swine pathogen that causes economic losses due to reproductive failure. Recently, C. suis has been detected in human eyes. However, knowledge of the zoonotic potential is still limited. C. suis infections in swine could present a risk for public health because (1) tetracycline-resistant C. suis strains are emerging in the pork industry, (2) tetracycline resistance gene transfers in vitro from C. suis to the human pathogen Chlamydia trachomatis and as previously demonstrated, (3) C. suis and C. trachomatis can be both present in the human eye. Pig farmers were sampled during a seminar in West-Flanders. Conjunctival swabs for detection of C. suis and C. trachomatis and for the detection of mucosal antibodies against C. suis and C. trachomatis were collected. The farmers completed a questionnaire designed to assess information on the following: (1) the health status of their pigs, (2) administration of veterinary drugs, (3) their professional and nonprofessional activities, (4) general health status, (5) smoking habits, (6) use of medication, (7) allergies, and (8) clinical signs/history. Thirty-three on 40 (82.5%) farmers participated. None of the conjunctival swabs contained C. trachomatis DNA and mucosal antibodies against C. trachomatis were not detected. Six of 33 (18.2%) farmers had C. suis DNA in their eyes and 22 of 33 (67%) swabs contained C. suis-specific mucosal antibodies. The older the farmer, higher the chance of finding C. suis antibodies in the eye. There was a significant correlation between the presence of conjunctivitis in the pigs and the occurrence of C. suis DNA in the eye of their owner. This study shows that C. suis may transfer from pigs to the human eye as specific mucosal antibodies were detected in conjunctivae of pig farmers. Veterinarians, general practitioners, and occupational physicians should be aware of the zoonotic potential of C. suis.
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Affiliation(s)
- Evelien Kieckens
- Laboratory for Immunology and Animal Biotechnology, Department of Animal Sciences and Aquatic Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Laura Van den Broeck
- Laboratory for Immunology and Animal Biotechnology, Department of Animal Sciences and Aquatic Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Mathias Van Gils
- Laboratory for Immunology and Animal Biotechnology, Department of Animal Sciences and Aquatic Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Servaas Morré
- Laboratory of Immunogenetics, Department of Medical Microbiology and Infection Control, VU University Medical Centre, Amsterdam, the Netherlands
- Faculty of Health, Medicine and Life Sciences, Department of Genetics and Cell Biology, Institute for Public Health Genomics, Research School GROW (School for Oncology and Developmental Biology), University of Maastricht, Maastricht, the Netherlands
| | - Daisy Vanrompay
- Laboratory for Immunology and Animal Biotechnology, Department of Animal Sciences and Aquatic Ecology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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8
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Yan K, Xue L, Wang S. Field of view scanning based quantitative interferometric microscopic cytometers for cellular imaging and analysis. Microsc Res Tech 2018; 81:397-407. [PMID: 29315973 DOI: 10.1002/jemt.22991] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 11/02/2017] [Accepted: 12/28/2017] [Indexed: 01/20/2023]
Abstract
Microimaging is of great significance in the biological and medical fields, since it can realize observations acting as important references for cellular research and disease diagnosis. However, traditional microscopy only offers qualitative sample contours; moreover, it is difficult to reach large-amount sample observations limited by the fixed field of view (FoV). To realize massive cellular measurements quantitatively, three designed quantitative interferometric microscopic cytometers based on the FoV scanning are introduced and compared in details in this article. These devices not only retrieve the quantitative sample phase distributions in the extended FoV, but also provide the detailed information of massive cells, such as cellular volume, area, and roundness. Considering their capabilities as quantitative imaging and large-amount sampling, it is believed that these quantitative interferometric microscopic cytometers (QIMCs) can be potentially adopted in high-throughput cell imaging and statistical analysis for both the biological and medical applications.
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Affiliation(s)
- Keding Yan
- School of Electronic Information Engineering, Xi'an Technological University, Xi'an, Shaanxi 710032, China.,Sinmotec LLC, Suzhou, Jiangsu, 215611, China
| | - Liang Xue
- College of Electronics and Information Engineering, Shanghai University of Electric Power, Shanghai 200090, China.,Sinmotec LLC, Suzhou, Jiangsu, 215611, China
| | - Shouyu Wang
- Computational Optics Laboratory, Department of Optoelectric Information Science and Technology, School of Science, Jiangnan University, Wuxi, Jiangsu 214122, China.,Single Molecule Nanometry Laboratory, Nanjing Agricultural University, Nanjing, Jiangsu, 210095, China.,Sinmotec LLC, Suzhou, Jiangsu, 215611, China
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9
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De Puysseleyr K, Kieckens E, De Puysseleyr L, Van den Wyngaert H, Ahmed B, Van Lent S, Creasy HH, Myers GSA, Vanrompay D. Development of a Chlamydia suis-specific antibody enzyme-linked immunosorbent assay based on the use of a B-cell epitope of the polymorphic membrane protein C. Transbound Emerg Dis 2018; 65:e457-e469. [PMID: 29314736 DOI: 10.1111/tbed.12783] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Indexed: 12/21/2022]
Abstract
Chlamydia suis infections lead to economic loss in the pork industry. Chlamydia suis infections could be successfully treated with tetracyclines until the appearance of a tetracycline resistant phenotype, which was acquired via horizontal gene transfer of the tet(C) gene. Given the importance of C. suis as a swine pathogen and as a recently emerged tetracycline resistant pathogen with zoonotic potential, our aim was to develop a sensitive C. suis-specific antibody ELISA based on the polymorphic membrane proteins (Pmps). Chlamydia Pmps are important virulence factors and candidate antigens for serodiagnosis. We identified nine Pmps (PmpA to I) in C. suis strain MD56 using a recently developed Hidden-Markov model. PmpC was the most promising candidate for the development of a C. suis-specific antibody ELISA as the protein was absent in C. abortus, C. pecorum and C. psittaci which also infect pigs and as the protein contained C. suis-specific amino acid regions, absent in C. trachomatis PmpC. We identified an immunodominant B-cell epitope in C. suis PmpC using experimental porcine sera. The sensitivity and specificity of the PmpC ELISA was compared to the complement fixation test (CFT) and to a recombinant MOMP ELISA using experimental sera. The PmpC ELISA detected all positive control sera and was in contrast to CFT and the rMOMP ELISA 100% C. suis specific as positive control sera against other Chlamydia species did not react in the PmpC ELISA. The test was successfully validated using slaughterhouse sera and sera from clinically affected pigs. The PmpC ELISA could assist in diminishing the spread of C. suis infections in the pork industry.
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Affiliation(s)
- K De Puysseleyr
- Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
| | - E Kieckens
- Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
| | - L De Puysseleyr
- Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
| | - H Van den Wyngaert
- Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
| | - B Ahmed
- Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
| | - S Van Lent
- Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
| | - H H Creasy
- Institute for Genome Sciences, University of Maryland School of Medicine, Baltimore, MD, USA
| | - G S A Myers
- i3 Institute, University of Technology, Sydney, NSW, Australia
| | - D Vanrompay
- Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Gent, Belgium
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