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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] [What about the content of this article? (0)] [Affiliation(s)] [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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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] [What about the content of this article? (0)] [Affiliation(s)] [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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3
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Molenberghs F, Bogers JJ, De Vos WH. Confined no more: Viral mechanisms of nuclear entry and egress. Int J Biochem Cell Biol 2020; 129:105875. [PMID: 33157236 DOI: 10.1016/j.biocel.2020.105875] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 10/27/2020] [Accepted: 10/29/2020] [Indexed: 12/14/2022]
Abstract
Viruses are obligatory intracellular parasites. For their efficient replication, many require access to the nuclear interior. Yet, only few viral particles are small enough to passively diffuse through the nuclear pore complexes, calling for alternative strategies to bypass the nuclear envelope barrier. Some viruses will await mitotic nuclear envelope breakdown to gain access, whereas others will exploit more active means, for instance by hijacking nuclear pore transport or by directly targeting constituents of the nuclear envelope so as to remodel and temporarily perturb its integrity. After replication, newly produced viral DNA complexes need to cross the same barrier to exit the nucleus and enter the cytoplasm, where the final stages of virion maturation take place. There are also different flavours to the feat of nuclear egress that vary in delicacy and intensity. In this review, we define the major entry and egress strategies that are exploited by different viruses and describe the molecular details thereof. Ultimately, a deeper understanding of these pathways may help identifying molecular targets for blocking viral reproduction or spreading.
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Affiliation(s)
- Freya Molenberghs
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences/Medicine and Health Sciences, University of Antwerp, Belgium
| | - Johannes J Bogers
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences/Medicine and Health Sciences, University of Antwerp, Belgium
| | - Winnok H De Vos
- Laboratory of Cell Biology and Histology, Department of Veterinary Sciences/Medicine and Health Sciences, University of Antwerp, Belgium.
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Depuydt CE, Thys S, Beert J, Jonckheere J, Salembier G, Bogers JJ. Linear viral load increase of a single HPV-type in women with multiple HPV infections predicts progression to cervical cancer. Int J Cancer 2016; 139:2021-32. [PMID: 27339821 DOI: 10.1002/ijc.30238] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 05/01/2016] [Accepted: 06/06/2016] [Indexed: 01/21/2023]
Abstract
Persistent high-risk human papillomavirus (HPV) infection is strongly associated with development of high-grade cervical intraepithelial neoplasia or cancer (CIN3+). In single type infections, serial type-specific viral-load measurements predict the natural history of the infection. In infections with multiple HPV-types, the individual type-specific viral-load profile could distinguish progressing HPV-infections from regressing infections. A case-cohort natural history study was established using samples from untreated women with multiple HPV-infections who developed CIN3+ (n = 57) or cleared infections (n = 88). Enriched cell pellet from liquid based cytology samples were subjected to a clinically validated real-time qPCR-assay (18 HPV-types). Using serial type-specific viral-load measurements (≥3) we calculated HPV-specific slopes and coefficient of determination (R(2) ) by linear regression. For each woman slopes and R(2) were used to calculate which HPV-induced processes were ongoing (progression, regression, serial transient, transient). In transient infections with multiple HPV-types, each single HPV-type generated similar increasing (0.27copies/cell/day) and decreasing (-0.27copies/cell/day) viral-load slopes. In CIN3+, at least one of the HPV-types had a clonal progressive course (R(2) ≥ 0.85; 0.0025copies/cell/day). In selected CIN3+ cases (n = 6), immunostaining detecting type-specific HPV 16, 31, 33, 58 and 67 RNA showed an even staining in clonal populations (CIN3+), whereas in transient virion-producing infections the RNA-staining was less in the basal layer compared to the upper layer where cells were ready to desquamate and release newly-formed virions. RNA-hybridization patterns matched the calculated ongoing processes measured by R(2) and slope in serial type-specific viral-load measurements preceding the biopsy. In women with multiple HPV-types, serial type-specific viral-load measurements predict the natural history of the different HPV-types and elucidates HPV-genotype attribution.
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Affiliation(s)
- Christophe E Depuydt
- Department of Clinical and Molecular Pathology, AML, Sonic Healthcare, Antwerp, Belgium
| | - Sofie Thys
- Laboratory for Cell Biology and Histology, University of Antwerp, Antwerp, Belgium
| | - Johan Beert
- Department of Clinical and Molecular Pathology, AML, Sonic Healthcare, Antwerp, Belgium.,Intermediate Structure for Human Body Material, AML, Sonic Healthcare, Antwerp, Belgium
| | - Jef Jonckheere
- Department of Clinical and Molecular Pathology, AML, Sonic Healthcare, Antwerp, Belgium
| | - Geert Salembier
- Department of Clinical and Molecular Pathology, AML, Sonic Healthcare, Antwerp, Belgium
| | - Johannes J Bogers
- Department of Clinical and Molecular Pathology, AML, Sonic Healthcare, Antwerp, Belgium.,Laboratory for Cell Biology and Histology, University of Antwerp, Antwerp, Belgium
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Lebelo RL, Bogers JJ, Thys S, Depuydt C, Benoy I, Selabe S, Bida MN, Mphahlele M. Detection, genotyping and quantitation of multiple hpv infections in south african women with cervical squamous cell carcinoma. J Med Virol 2015; 87:1594-600. [DOI: 10.1002/jmv.24132] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/28/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Ramokone L. Lebelo
- HIV and Hepatitis Research Unit; Department of Virology; University of Limpopo; Medunsa campus/National Health Laboratory Service; Pretoria South Africa
| | - Johannes J. Bogers
- Applied Molecular Biology Research Group; University of Antwerp; Antwerp Belgium
- Department of Molecular Diagnostics; Laboratory for Clinical Pathology AML; Sonic HealthCare Benelux; Antwerp Belgium
| | - Sofie Thys
- Applied Molecular Biology Research Group; University of Antwerp; Antwerp Belgium
- Laboratory for Cell Biology and Histology; University of Antwerp; Antwerp Belgium
| | - Christophe Depuydt
- Department of Molecular Diagnostics; Laboratory for Clinical Pathology AML; Sonic HealthCare Benelux; Antwerp Belgium
| | - Ina Benoy
- Department of Molecular Diagnostics; Laboratory for Clinical Pathology AML; Sonic HealthCare Benelux; Antwerp Belgium
| | - S.Gloria Selabe
- HIV and Hepatitis Research Unit; Department of Virology; University of Limpopo; Medunsa campus/National Health Laboratory Service; Pretoria South Africa
| | - Meshack N. Bida
- Department of Anatomical Pathology; University of Limpopo; Medunsa campus/National Health Laboratory Service; Pretoria South Africa
| | - M.Jeffrey Mphahlele
- HIV and Hepatitis Research Unit; Department of Virology; University of Limpopo; Medunsa campus/National Health Laboratory Service; Pretoria South Africa
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6
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Depuydt CE, Jonckheere J, Berth M, Salembier GM, Vereecken AJ, Bogers JJ. Serial type-specific human papillomavirus (HPV) load measurement allows differentiation between regressing cervical lesions and serial virion productive transient infections. Cancer Med 2015; 4:1294-302. [PMID: 25991420 PMCID: PMC4559041 DOI: 10.1002/cam4.473] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 03/25/2015] [Accepted: 04/16/2015] [Indexed: 11/07/2022] Open
Abstract
Persistent high-risk human papillomavirus (HPV) infection is strongly associated with the development of high-grade cervical intraepithelial neoplasia (CIN) or cancer. Not all persistent infections lead to cancer. Viral load measured at a single time-point is a poor predictor of the natural history of HPV infections. However the profile of viral load evolution over time could distinguish nonprogressive from progressive (carcinogenic) infections. A retrospective natural history study was set up using a Belgian laboratory database including more than 800,000 liquid cytology specimens. All samples were submitted to qPCR identifying E6/E7 genes of 18 HPV types. Viral load changes over time were assessed by the linear regression slope. Database search identified 261 untreated women with persistent type-specific HPV DNA detected (270 infections) in at least three of the last smears for a average period of 3.2 years. Using the coefficient of determination (R²) infections could be subdivided in a latency group (n = 143; R² < 0.85) and a regressing group (n = 127; R² ≥ 0.85). In (≥ 3) serial viral load measurements, serial transient infections with latency is characterized by a nonlinear limited difference in decrease or increase of type-specific viral load (R² < 0.85 and slopes between 2 measurements 0.0010 and -0.0010 HPV copies/cell per day) over a longer period of time (1553 days), whereas regression of a clonal cell population is characterized by a linear (R² ≥ 0.85) decrease (-0.0033 HPV copies/cell per day) over a shorter period of time (708 days; P < 0.001). Using serial HPV type-specific viral load measurements we could for the first time identify regressing CIN2 and CIN3 lesions. Evolution of the viral load is an objective measurable indicator of the natural history of HPV infections and could be used for future triage in HPV-based cervical screening programs.
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Affiliation(s)
| | - Jef Jonckheere
- Department of Molecular Diagnostics, AML, Sonic Healthcare, Antwerp, Belgium
| | - Mario Berth
- Department of Immunology, AML, Sonic Healthcare, Antwerp, Belgium
| | - Geert M Salembier
- Department of Molecular Diagnostics, AML, Sonic Healthcare, Antwerp, Belgium
| | - Annie J Vereecken
- Department of Molecular Diagnostics, AML, Sonic Healthcare, Antwerp, Belgium
| | - Johannes J Bogers
- Department of Molecular Diagnostics, AML, Sonic Healthcare, Antwerp, Belgium.,Laboratory for Cell Biology and Histology, University of Antwerp, Antwerp, Belgium
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7
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Dochez C, Bogers JJ, Verhelst R, Rees H. HPV vaccines to prevent cervical cancer and genital warts: an update. Vaccine 2014; 32:1595-601. [DOI: 10.1016/j.vaccine.2013.10.081] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 10/24/2013] [Accepted: 10/24/2013] [Indexed: 12/12/2022]
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8
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Depuydt CE, Criel AM, Benoy IH, Arbyn M, Vereecken AJ, Bogers JJ. Changes in type-specific human papillomavirus load predict progression to cervical cancer. J Cell Mol Med 2014; 16:3096-104. [PMID: 22978795 PMCID: PMC4393737 DOI: 10.1111/j.1582-4934.2012.01631.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Accepted: 09/03/2012] [Indexed: 11/28/2022] Open
Abstract
Persistent high-risk human papillomavirus (HPV) infection is strongly associated with the development of high-grade cervical intraepithelial neoplasia or cancer (CIN3+). However, HPV infection is common and usually transient. Viral load measured at a single time-point is a poor predictor of the natural history of HPV infection. The profile of viral load evolution over time could distinguish HPV infections with carcinogenic potential from infections that regress. A case-cohort natural history study was set-up using a Belgian laboratory database processing more than 100,000 liquid cytology specimens annually. All cytology leftovers were submitted to real-time PCR testing identifying E6/E7 genes of 17 HPV types, with viral load expressed as HPV copies/cell. Samples from untreated women who developed CIN3+ (n = 138) and women with transient HPV infection (n = 601) who contributed at least three viral load measurements were studied. Only single-type HPV infections were selected. The changes in viral load over time were assessed by the linear regression slope for the productive and/or clearing phase of infection in women developing CIN3+ and women with transient infection respectively. Transient HPV infections generated similar increasing (0.21 copies/cell/day) and decreasing (−0.28 copies/cell/day) viral load slopes. In HPV infections leading to CIN3+, the viral load increased almost linearly with a slope of 0.0028 copies/cell/day. Difference in slopes between transient infections and infections leading to CIN3+ was highly significant (P < .0001). Serial type-specific viral load measurements predict the natural history of HPV infections and could be used to triage women in HPV-based cervical cancer screening.
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Affiliation(s)
- Christophe E Depuydt
- RIATOL, Department of Molecular Diagnostics, Sonic Healthcare Benelux, Antwerp, Belgium.
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9
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Micalessi MI, Boulet GA, Pillet S, Jacquet J, Pozzetto B, Bogers JJ, Bourlet T. Comparison of SPF10 real-time PCR and conventional PCR in combination with the INNO-LiPA HPV Genotyping Extra assay for the detection and typing of human papillomavirus in cervical samples. J Virol Methods 2013; 194:113-7. [PMID: 23978605 DOI: 10.1016/j.jviromet.2013.08.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Revised: 08/12/2013] [Accepted: 08/15/2013] [Indexed: 11/18/2022]
Abstract
The novel SPF10 real-time PCR assay allows the simultaneous amplification and detection of the HPV target. That way, LiPA analysis of the HPV-negative samples can be avoided, reducing workload and cost. This study aims to evaluate the performance of the SPF10 real-time PCR in combination with the LiPA assay for HPV detection and typing in cervical samples. Thirty-nine cervical samples were subjected to the SPF10 conventional PCR in combination with the LiPA assay. Subsequently, the SPF10 real-time PCR was performed to enable the comparison between the SPF10 conventional and the real-time PCR results. In case of discrepancy, the samples were subjected to the CLART HPV2 assay. As a result, 27 out of 39 samples were identified as HPV-positive by the SPF10 real-time PCR and were genotyped further by the LiPA assay. Twenty samples (74.1%) showed an absolute agreement between the conventional and real-time SPF10 PCR (concordant), three (11.1%) displayed additional or fewer types (compatible), two (7.4%) did not show any similarity between both assays (discordant) and the remaining two (7.4%) were LiPA-negative. The two assays showed an excellent strength of agreement for individual (κ=0.932) and multiple genotype detection (κ=0.834). In conclusion, the two SPF10 PCR methods are comparable. Therefore, the SPF10 real-time PCR with subsequent LiPA could be used for the detection and genotyping of HPV in cervical samples.
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Affiliation(s)
- M I Micalessi
- Applied Molecular Biology Research (AMBIOR) Group, Laboratory of Cell Biology and Histology, University of Antwerp, Groenenborgerlaan 171, B2020 Antwerp, Belgium; Vaccine & Infectious Diseases Institute (VAXINFECTIO), University of Antwerp, Universiteitsplein 1, B2610 Antwerp, Belgium.
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10
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Ledeganck KJ, Boulet GA, Bogers JJ, Verpooten GA, De Winter BY. The TRPM6/EGF pathway is downregulated in a rat model of cisplatin nephrotoxicity. PLoS One 2013; 8:e57016. [PMID: 23457647 PMCID: PMC3574071 DOI: 10.1371/journal.pone.0057016] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Accepted: 01/17/2013] [Indexed: 12/11/2022] Open
Abstract
Cisplatin-induced hypomagnesemia is described in humans and rats, but the underlying mechanisms are still unclear. Recent studies have shown that epidermal growth factor (EGF) stimulates Mg2+ re-absorption in the distal convoluted tubule via the Mg2+ channel TRPM6. This study investigates the role of TRPM Mg2+ channels, claudines, and EGF in the Mg2+ homeostasis in a rat model of cisplatin-induced nephrotoxicity. Wistar rats were given 2.5 mg/kg cisplatin per week for 3 weeks and were euthanized 4 or 9 weeks after the first administration. The cisplatin treatment significantly increased the fractional excretion of Mg2+. Real-time RT-PCR and/or Western blots were performed to assess the renal expression TRPM6, TRPM7, claudin-16, claudin-19, EGF, EGF receptor (EGFR) and EGFR-pathway components. The renal mRNA expression of TRPM6 and EGF showed a significant decrease after cisplatin treatment, while the TRPM7, claudin-16 and EGFR expressions remained stable. The claudin-19 mRNA expression was significantly upregulated after cisplatin treatment. Western blotting confirmed the mRNA expression data for the claudins, but an showed upregulation of EGFR only at week 9. The role of the EGFR pathway, involving Pi3-AKT-Rac1, in cisplatin-induced nephropathy, could not be substantiated in further detail. This study shows that cisplatin treatment results in EGF and TRPM6 downregulation in the rat kidney, causing renal Mg2+ loss. Our results are in line with the hypothesis that EGF influences the renal expression or activation of TRPM6 and plays a significant role in Mg2+ loss in medication-induced nephropathy.
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Affiliation(s)
- Kristien J. Ledeganck
- Laboratory of Experimental Medicine and Pediatrics, University of Antwerp, Antwerp, Belgium
| | - Gaëlle A. Boulet
- Applied Molecular Biology Research Group, University of Antwerp, Antwerp, Belgium
| | - Johannes J. Bogers
- Applied Molecular Biology Research Group, University of Antwerp, Antwerp, Belgium
| | - Gert A. Verpooten
- Laboratory of Experimental Medicine and Pediatrics, University of Antwerp, Antwerp, Belgium
- Department of Nephrology-Hypertension, Antwerp University Hospital, Edegem, Belgium
| | - Benedicte Y. De Winter
- Laboratory of Experimental Medicine and Pediatrics, University of Antwerp, Antwerp, Belgium
- * E-mail:
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Micalessi MI, Boulet GA, Vorsters A, De Wit K, Jannes G, Mijs W, Ieven M, Van Damme P, Bogers JJ. WITHDRAWN: A real-time PCR approach based on SPF10 primers and the INNO-LiPA HPV Genotyping Extra assay for the detection and typing of human papillomavirus. J Virol Methods 2012:S0166-0934(12)00167-X. [PMID: 22626567 DOI: 10.1016/j.jviromet.2012.05.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 05/13/2012] [Accepted: 05/15/2012] [Indexed: 10/28/2022]
Abstract
This article has been withdrawn at the request of the author(s) and/or editor. The Publisher apologizes for any inconvenience this may cause. The full Elsevier Policy on Article Withdrawal can be found at http://www.elsevier.com/locate/withdrawalpolicy.
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Affiliation(s)
- M I Micalessi
- Applied Molecular Biology Research (AMBIOR) Group, Laboratory of Cell Biology and Histology, University of Antwerp, Groenenborgerlaan 171, B2020Antwerp,Belgium; Vaccine & Infectious Diseases Institute (VAXINFECTIO), University of Antwerp, Universiteitsplein 1, B2610Antwerp,Belgium
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12
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Micalessi IM, Boulet GA, Bogers JJ, Benoy IH, Depuydt CE. High-throughput detection, genotyping and quantification of the human papillomavirus using real-time PCR. Clin Chem Lab Med 2012; 50:655-61. [DOI: 10.1515/cclm.2011.835] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Accepted: 11/28/2011] [Indexed: 11/15/2022]
Abstract
AbstractThe establishment of the causal relationship between high-risk human papillomavirus (HR-HPV) infection and cervical cancer and its precursors has resulted in the development of HPV DNA detection systems. Currently, real-time PCR assays for the detection of HPV, such as the RealTime High Risk (HR) HPV assay (Abbott) and the cobas® 4800 HPV Test (Roche Molecular Diagnostics) are commercially available. However, none of them enables the detection and typing of all HR-HPV types in a clinical high-throughput setting. This paper describes the laboratory workflow and the validation of a type-specific real-time quantitative PCR (qPCR) assay for high-throughput HPV detection, genotyping and quantification. This assay is routinely applied in a liquid-based cytology screening setting (700 samples in 24 h) and was used in many epidemiological and clinical studies.The TaqMan-based qPCR assay enables the detection of 17 HPV genotypes and β-globin in seven multiplex reactions. These HPV types include all 12 high-risk types (HPV16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59), three probably high-risk types (HPV53, 66 and 68), one low-risk type (HPV6) and one undetermined risk type (HPV67).An analytical sensitivity of ≤100 copies was obtained for all the HPV types. The analytical specificity of each primer pair was 100% and an intra- and inter-run variability of <6.4% was observed.The type-specific real-time PCR approach enables detection of 17 HPV types, identification of the HPV type and determination of the viral load in a single sensitive assay suitable for high-throughput screening.
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Benoy IH, Vanden Broeck D, Ruymbeke MJ, Sahebali S, Arbyn M, Bogers JJ, Temmerman M, Depuydt CE. Prior knowledge of HPV status improves detection of CIN2+ by cytology screening. Am J Obstet Gynecol 2011; 205:569.e1-7. [PMID: 21903190 DOI: 10.1016/j.ajog.2011.06.101] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2010] [Revised: 03/02/2011] [Accepted: 06/28/2011] [Indexed: 10/18/2022]
Abstract
OBJECTIVE The objective of the study was to investigate whether knowledge of human papillomavirus (HPV) deoxyribonucleic acid test results increases sensitivity of guided cytology screening for the detection of cervical intraepithelial neoplasia (CIN)-2 or higher-grade cervical lesions. STUDY DESIGN This was a prospective colposcopy-controlled study of 2905 BD SurePath samples to identify cases with CIN2+ within a 24 month follow-up period. Sensitivity and specificity to detect CIN2+ was evaluated, comparing guided cytology screening with and without prior knowledge of HPV status. RESULTS Prior knowledge of HPV status resulted in significantly higher detection rate of CIN2+ compared with screening blinded to HPV status (P = .005) with limited loss of specificity (P = .026). Gain in sensitivity is higher in older women (43.8%, P = .008) vs in younger women (10.2%, P = .317), whereas loss of specificity is more pronounced in younger women (P < .001) vs older women (P = .729). CONCLUSION Guided cytological screening performed with prior knowledge of HPV status results in an improved detection of CIN2 or higher-grade lesions.
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Ledeganck KJ, Boulet GA, Horvath CA, Vinckx M, Bogers JJ, Van Den Bossche R, Verpooten GA, De Winter BY. Expression of renal distal tubule transporters TRPM6 and NCC in a rat model of cyclosporine nephrotoxicity and effect of EGF treatment. Am J Physiol Renal Physiol 2011; 301:F486-93. [DOI: 10.1152/ajprenal.00116.2011] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Renal magnesium (Mg2+) and sodium (Na+) loss are well-known side effects of cyclosporine (CsA) treatment in humans, but the underlying mechanisms still remain unclear. Recently, it was shown that epidermal growth factor (EGF) stimulates Mg2+ reabsorption in the distal convoluted tubule (DCT) via TRPM6 (Thébault S, Alexander RT, Tiel Groenestege WM, Hoenderop JG, Bindels RJ. J Am Soc Nephrol 20: 78–85, 2009). In the DCT, the final adjustment of renal sodium excretion is regulated by the thiazide-sensitive Na+-Cl− cotransporter (NCC), which is activated by the renin-angiotensin-aldosterone system (RAAS). The aim of this study was to gain more insight into the molecular mechanisms of CsA-induced hypomagnesemia and hyponatremia. Therefore, the renal expression of TRPM6, TRPM7, EGF, EGF receptor, claudin-16, claudin-19, and the NCC, and the effect of the RAAS on NCC expression, were analyzed in vivo in a rat model of CsA nephrotoxicity. Also, the effect of EGF administration on these parameters was studied. CsA significantly decreased the renal expression of TRPM6, TRPM7, NCC, and EGF, but not that of claudin-16 and claudin-19. Serum aldosterone was significantly lower in CsA-treated rats. In control rats treated with EGF, an increased renal expression of TRPM6 together with a decreased fractional excretion of Mg2+ (FE Mg2+) was demonstrated. EGF did not show this beneficial effect on TRPM6 and FE Mg2+ in CsA-treated rats. These data suggest that CsA treatment affects Mg2+ homeostasis via the downregulation of TRPM6 in the DCT. Furthermore, CsA downregulates the NCC in the DCT, associated with an inactivation of the RAAS, resulting in renal sodium loss.
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Affiliation(s)
| | | | | | | | | | | | - Gert A. Verpooten
- Laboratory of Experimental Medicine and Pediatrics,
- Department of Nephrology-Hypertension, Antwerp University Hospital, Edegem, Antwerp, Belgium
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Depuydt CE, Makar AP, Ruymbeke MJ, Benoy IH, Vereecken AJ, Bogers JJ. BD-ProExC as Adjunct Molecular Marker for Improved Detection of CIN2+ after HPV Primary Screening. Cancer Epidemiol Biomarkers Prev 2011; 20:628-37. [DOI: 10.1158/1055-9965.epi-10-0818] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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Boulet GA, Benoy IH, Depuydt CE, Horvath CA, Aerts M, Hens N, Vereecken AJ, Bogers JJ. Human Papillomavirus 16 Load and E2/E6 Ratio in HPV16-Positive Women: Biomarkers for Cervical Intraepithelial Neoplasia ≥2 in a Liquid-Based Cytology Setting? Cancer Epidemiol Biomarkers Prev 2009; 18:2992-9. [DOI: 10.1158/1055-9965.epi-09-0025] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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17
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Depuydt CE, Arbyn M, Benoy IH, Vandepitte J, Vereecken AJ, Bogers JJ. Quality control for normal liquid-based cytology: rescreening, high-risk HPV targeted reviewing and/or high-risk HPV detection? J Cell Mol Med 2008; 13:4051-60. [PMID: 18544049 PMCID: PMC4516552 DOI: 10.1111/j.1582-4934.2008.00379.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The objective of this prospective study was to compare the number of CIN2+cases detected in negative cytology by different quality control (QC) methods. Full rescreening, high-risk (HR) human papillomavirus (HPV)-targeted reviewing and HR HPV detection were compared. Randomly selected negative cytology detected by BD FocalPoint™ (NFR), by guided screening of the prescreened which needed further review (GS) and by manual screening (MS) was used. A 3-year follow-up period was available. Full rescreening of cytology only detected 23.5% of CIN2+ cases, whereas the cytological rescreening of oncogenic positive slides (high-risk HPV-targeted reviewing) detected 7 of 17 CIN2+ cases (41.2%). Quantitative real-time PCR for 15 oncogenic HPV types detected all CIN2+ cases. Relative sensitivity to detect histological CIN2+ was 0.24 for full rescreening, 0.41 for HR-targeted reviewing and 1.00 for HR HPV detection. In more than half of the reviewed negative cytological preparations associated with histological CIN2+cases no morphologically abnormal cells were detected despite a positive HPV test. The visual cut-off for the detection of abnormal cytology was established at 6.5 HR HPV copies/cell. High-risk HPV detection has a higher yield for detection of CIN2+ cases as compared to manual screening followed by 5% full review, or compared to targeted reviewing of smears positive for oncogenic HPV types, and show diagnostic properties that support its use as a QC procedure in cytologic laboratories.
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Affiliation(s)
- Christophe E Depuydt
- Laboratory for Clinical Pathology, Labo Lokeren, campus RIATOL, Amerikalei, Antwerp, Belgium.
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Boulet GAV, Horvath CAJ, Berghmans S, Moeneclaey LM, Duys ISM, Arbyn M, Depuydt CE, Vereecken AJ, Sahebali S, Bogers JJ. Cervical cytology biobanking: quality of DNA from archival cervical Pap-stained smears. J Clin Pathol 2008; 61:637-41. [DOI: 10.1136/jcp.2007.052688] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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19
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Depuydt CE, Boulet GAV, Horvath CAJ, Benoy IH, Vereecken AJ, Bogers JJ. Comparison of MY09/11 consensus PCR and type-specific PCRs in the detection of oncogenic HPV types. J Cell Mol Med 2007; 11:881-91. [PMID: 17760847 PMCID: PMC3823264 DOI: 10.1111/j.1582-4934.2007.00073.x] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
The causal relationship between persistent infection with high-risk HPV and cervical cancer has resulted in the development of HPV DNA detection systems. The widely used MY09/11 consensus PCR targets a 450bp conserved sequence in the HPV L1 gene, and can therefore amplify a broad spectrum of HPV types. However, limitations of these consensus primers are evident, particularly in regard to the variability in detection sensitivity among different HPV types. This study compared MY09/11 PCR with type-specific PCRs in the detection of oncogenic HPV types. The study population comprised 15, 774 patients. Consensus PCR failed to detect 522 (10.9%) HPV infections indicated by type-specific PCRs. A significant correlation between failure of consensus PCR and HPV type was found. HPV types 51, 68 and 45 were missed most frequently. The clinical relevance of the HPV infections missed by MY09/11 PCR was reflected in the fraction of cases with cytological abnormalities and in follow-up, showing 104 (25.4%) CIN2+ cases. The MY09/11 false negativity could be the result of poor sensitivity, mismatch of MY09/11 primers or disruption of L1 target by HPV integration or DNA degradation. Furthermore, MY09/11 PCR lacked specificity for oncogenic HPVs. Diagnostic accuracy of the PCR systems, in terms of sensitivity (MY09/11 PCR: 87.9%; type-specific PCRs: 98.3%) and specificity (MY09/11 PCR: 38.7%; type-specific PCRs: 76.14%), and predictive values for histologically confirmed CIN2+, suggest that type-specific PCRs could be used in a clinical setting as a reliable screening tool.
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Affiliation(s)
- C E Depuydt
- Laboratory for Clinical Pathology (Labo Lokeren, campus RIATOL), Antwerp, Belgium
- *Correspondence to: Gaëlle BOULET University of Antwerp (Campus Groenenborger) AMBIOR, Laboratory for Cell Biology and Histology Groenenborgerlaan 171, B-2020 Antwerp, Belgium. Tel.: +32 32 65 33 25; Fax.: +32 32 65 33 26 E-mail:
| | - G A V Boulet
- Applied Molecular Biology Research (AMBIOR) group, Laboratory for Cell Biology and Histology, University of Antwerp, Antwerp, Belgium
- *Correspondence to: Gaëlle BOULET University of Antwerp (Campus Groenenborger) AMBIOR, Laboratory for Cell Biology and Histology Groenenborgerlaan 171, B-2020 Antwerp, Belgium. Tel.: +32 32 65 33 25; Fax.: +32 32 65 33 26 E-mail:
| | - C A J Horvath
- Applied Molecular Biology Research (AMBIOR) group, Laboratory for Cell Biology and Histology, University of Antwerp, Antwerp, Belgium
| | - I H Benoy
- Laboratory for Clinical Pathology (Labo Lokeren, campus RIATOL), Antwerp, Belgium
| | - A J Vereecken
- Laboratory for Clinical Pathology (Labo Lokeren, campus RIATOL), Antwerp, Belgium
| | - J J Bogers
- Laboratory for Clinical Pathology (Labo Lokeren, campus RIATOL), Antwerp, Belgium
- Applied Molecular Biology Research (AMBIOR) group, Laboratory for Cell Biology and Histology, University of Antwerp, Antwerp, Belgium
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Boulet GAV, Schrauwen I, Sahebali S, Horvath C, Depuydt CE, Vereecken A, Broeck DV, Van Marck EA, Bogers JJ. Correlation between laminin-5 immunohistochemistry and human papillomavirus status in squamous cervical carcinoma. J Clin Pathol 2007; 60:896-901. [PMID: 17660333 PMCID: PMC1994496 DOI: 10.1136/jcp.2006.037549] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/01/2006] [Indexed: 11/04/2022]
Abstract
BACKGROUND Human papillomavirus (HPV) plays a critical role in the carcinogenesis of squamous cervical carcinoma. Integration of viral DNA into the host genome is a major contributing factor to malignant transformation. Viral load may influence integration. AIMS To compare HPV status (type, viral load, integration status) between normal samples, carcinoma in situ and invasive carcinoma in order to elucidate the role of HPV in progression to invasive lesions. METHODS The study population comprised 10 biopsy samples from each diagnostic group. Laminin-5 immunohistochemistry was performed to distinguish invasive carcinoma from non-invasive high-grade lesions. Real-time PCR was used to detect specific HPV types, viral load and integrated HPV, with quantification of viral E2 and E6 genes. RESULTS Invasive carcinomas contained a higher number of laminin-5 immunoreactive cells as compared to non-invasive lesions. Almost all samples contained HPV, with a higher viral load and copy number of HPV16 integrated in E2 in cases of laminin-5 immunoreactivity and cases of invasive carcinoma. High HPV16 viral load was associated with more integrated copies in E2. CONCLUSIONS HPV is important in progression from carcinoma in situ to invasive carcinoma. Viral load and HPV integration influence the development of cervical cancer towards invasiveness. Overall HPV status may be more predictive of patient outcome and may influence patient management.
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Affiliation(s)
- G A V Boulet
- Ambior-IX, Laboratory of Cell Biology & Histology, University of Antwerp, Antwerp, Belgium
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Depuydt CE, Benoy IH, Bailleul EJ, Vandepitte J, Vereecken AJ, Bogers JJ. Improved endocervical sampling and HPV viral load detection by Cervex-Brush Combi. Cytopathology 2007; 17:374-81. [PMID: 17168921 DOI: 10.1111/j.1365-2303.2006.00386.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVE Liquid-based cytology (LBC) for cervical screening is becoming increasingly used. Together with SurePath LBC, various collecting devices can be utilized, among which the Cervex-Brush is the most widely used. The new Rovers Cervex-Brush Combi combines the advantages of the Cervex-Brush with the EndoCervex-Brush increasing sampling of the endocervical canal. The objective of this study was to analyse and to compare the Cervex-Brush Combi with the Cervex-Brush for the collection of squamous and endocervical cells, human papillomavirus (HPV) typing/quantification and disease detection in SurePath LBC. METHODS Using either the Cervex-Brush or the Cervex-Brush Combi 100 consecutive SurePath LBC samples were collected using each brush type. All 200 slides were read by the FocalPoint and screened by guided screening using slide wizards. The viral load of HPV type 16 E7, 18 E7, 31 E6, 33 L1, 33 E6, 35 E4, 39 E7, 45 E7, 51 E6, 52 L1, 52 E7, 53 E6, 56 E7, 58 L1, 58 E6, 59 E7, 66 E6 and 68 E7 was determined using a TaqMan-based real-time quantitative PCR analysis. RESULTS The mean number of sampled squamous cells did not differ between the two brush types (54 963 versus 54 595 cells). The use of the Cervex-Brush Combi, however, resulted in a two- to threefold increase in the number of sampled endocervical cells (P < 0.00001). Using the Cervex-Brush Combi slightly more lesions were detected (three versus two low-grade squamous intraepithelial lesions), and resulted in the detection of more atypical squamous cells of undetermined significance (six versus three). In the Cervex-Brush group, 60% (3/5) of abnormal smears were positive for oncogenic HPV types, whereas 66.7% (6/9) of abnormal smears in the Cervex-Brush Combi group tested positive. The median HPV viral load for samples taken with the Cervex-Brush Combi was 0.1825 copies/cell and was significantly higher than in samples taken with the Cervex-Brush (0.0042 copies/cell) (P = 0.02). CONCLUSION Sampling with the Cervex-Brush Combi resulted in the collection of the same amount of squamous cells, but in a two to threefold harvest of endocervical cells. This led to the detection of a higher viral load for oncogenic HPV and an increase in the number of detected abnormal smears.
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Affiliation(s)
- C E Depuydt
- Laboratory for Clinical Pathology (Labo RIATOL), Antwerp, Belgium.
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Sahebali S, Depuydt CE, Boulet GAV, Arbyn M, Moeneclaey LM, Vereecken AJ, Van Marck EA, Bogers JJ. Immunocytochemistry in liquid-based cervical cytology: analysis of clinical use following a cross-sectional study. Int J Cancer 2006; 118:1254-60. [PMID: 16161049 DOI: 10.1002/ijc.21489] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Cytological screening for cervical cancer is hampered by imperfect sensitivity and low inter-observer reproducibility. Human papillomavirus (HPV) testing lacks specificity as a primary screening method. Studies indicate that immunocytochemical detection of alterations caused by HPV in the host cells can optimise screening. Here, the potential of p16(INK4a) (cyclin-dependent kinase inhibitor p16) and MIB-1 (Ki-67 proliferation marker) as adjunct molecular markers for cervical lesions was investigated in a prospective, cross-sectional study of 500 samples in the framework of opportunistic screening in Flanders, Belgium. A consecutive series of 200 samples and 100 samples from the cytological categories ASC, LSIL and HSIL were investigated. Surepath samples were interpreted according to the Bethesda 2001 reporting system. HPV testing was done with MY09/MY11 consensus PCR. Immunocytochemistry for p16(INK4a) and MIB-1 was performed with an automated staining protocol. The number of immunoreactive cells/1,000 cervical cells was assessed. There was a higher mean number of p16(INK4A) and MIB-1 immunoreactive cells/1,000 cells in HSIL (4.06 +/- 1.93 and 11.13 +/- 2.83, respectively) compared to other cytological categories. Both markers showed a large spread in counts, for all categories. In cases of HSIL without immunoreactive cells for either marker, low cellularity and long-term storage in water were often the cause of false negativity. This study confirms that positive staining for p16(INK4a) and MIB-1 is highly correlated with presence of high-grade lesions. These markers could be used as adjuncts to increase the sensitivity of cytological screening as well as the specificity of the HPV test. However, clear methodological standards are needed for optimal performance of immunocytochemistry in a clinical setting.
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Affiliation(s)
- Shaira Sahebali
- Department of Pathology, University of Antwerp, Groenenborgerlaan 171, BE-2020 Antwerp, Belgium.
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Tjalma WAA, Arbyn M, Paavonen J, van Waes TR, Bogers JJ. Prophylactic human papillomavirus vaccines: the beginning of the end of cervical cancer. Int J Gynecol Cancer 2004; 14:751-61. [PMID: 15361181 DOI: 10.1111/j.1048-891x.2004.014505.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Persistent infection with one of the oncogenic human papillomavirus (HPV) types is a necessity for the development of cervical cancer. By HPV vaccination, cervical cancer could become a very rare disease. Two types of HPV vaccines can be distinguished: (i) therapeutic vaccines which induce cellular immunity targeted against epithelial cells infected with HPV and (ii) prophylactic vaccines inducing virus-neutralizing antibodies protecting against new but not against established infections. At present, several vaccines have been developed and tested in clinical trials. The vaccines are generally well tolerated and highly immunogenic. The current clinical data indicate that prophylactic vaccines are very effective against new persistent infections and the development of cervical intraepithelial lesions. The protection is type specific. However, the follow-up of the vaccination trials is still short. The effect of HPV vaccines on future cancer incidence will only be known after decades of follow-up. This article will address the status of recently terminated phase II and currently running phase III trials with prophylactic HPV vaccines.
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Affiliation(s)
- W A A Tjalma
- Department of Gynecology and Gynecologic Oncology, University Hospital Antwerp, University Antwerp, 2650 Edegem, Antwerp, Belgium
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Trinh XB, Bogers JJ, Van Marck EA, Tjalma WAA. Treatment policy of neuroendocrine small cell cancer of the cervix. EUR J GYNAECOL ONCOL 2004; 25:40-4. [PMID: 15053060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Small cell cancers of the cervix are very rare and aggressive tumours. It is difficult to manage these tumours. They are often diagnosed in an advanced stage and their prognosis is generally poor. There are no clinical trials, due to their rarity, that would suggest optimal treatment. The present report describes a patient with a neuroendocrine small cell cancer of the cervix Stage IB2 with a positive lymph node. The treatment consisted of radical hysterectomy and node dissection, adjuvant chemotherapy, chemoradiation and brachytherapy. Currently, after 52 months, the patient is well and free of disease. Since 1996, there has been a classification for neuroendocrine tumours (NETs) of the cervix in four categories (large cell, small cell, typical carcinoid and atypical carcinoid). The aggressive behaviour of neuroendocrine small cell cancer is demonstrated by the high percentage of early lymphatic node and vessel invasion (68 and 90%). Almost half of the patients with Stage I and II will recur with an estimated 5-year survival from 14% to a maximum of 55%. Multimodal therapy for these tumours appears to give good response but often implies severe side-effects.
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Affiliation(s)
- X B Trinh
- University Hospital Antwerp, Department of Gynaecologic Oncology, Edegem, Belgium
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Sahebali S, Depuydt CE, Segers K, Moeneclaey LM, Vereecken AJ, Van Marck E, Bogers JJ. P16INK4a as an adjunct marker in liquid-based cervical cytology. Int J Cancer 2004; 108:871-6. [PMID: 14712490 DOI: 10.1002/ijc.11589] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Cytological screening for cervical cancer is hampered by high false negative rates. Inter-observer reproducibility needs optimizing. The potential of p16(INK4a) as a biomarker for cervical lesions was examined in a study of liquid-based cytology (LBC), HPV DNA testing by MY09/MY11 consensus PCR and type-specific PCRs and p16(INK4a) immunocytochemistry on a series of 291 patients selected from routine screening. Comparison of the number of p16(INK4a) immunoreactive cells/1,000 cells exhibited a significantly higher mean count in HSIL (8.80 +/- 1.13) than other cytological groups. The mean count of LSIL (1.09 +/- 0.18) was significantly higher than that of the negative group (0.82 +/- 0.40). ASC-H and HSIL combined showed a significantly higher mean count (6.46 +/- 1.17) than negative, ASC, ASC-US and LSIL. The mean count of immunoreactive cells/1,000 cells was significantly higher in HPV16 positive samples (3.22 +/- 0.72) than in samples containing infections with types of unknown malignant potential (0.83 +/- 0.26) or HPV negative samples (1.17 +/- 0.41). The mean count in infections with other high-risk HPV types (2.55 +/- 0.52) was significantly higher than that in HPV negative samples. Receiver-operating characteristic curves yielded a test accuracy (area under curve) of 0.76, 0.79, 0.88 and 0.95 for ASCUS, LSIL, ASC-H/HSIL and HSIL, respectively. Thresholds for 95% sensitivity were at 0.005, 0.007, 0.098 and 0.445 immunopositive cells/1,000 cells for ASCUS, LSIL, ASC-H/HSIL and HSIL, respectively. The 95% specificity threshold for the detection of HSIL was at 1.87 immunopositive cells/1,000 cells. P16(INK4a) immunocytochemistry can be used as an adjunct to LBC in cervical screening, because it has a good diagnostic accuracy to discriminate HSIL and ASC-H from other lesions. It could be used as a surrogate marker of high-risk HPV infections.
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Affiliation(s)
- Shaira Sahebali
- Department of Pathology, University of Antwerp, Wilrijkstraat 10, B-2650 Antwerp (Edegem), Belgium
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Sahebali S, Depuydt CE, Segers K, Vereecken AJ, Van Marck E, Bogers JJ. Ki-67 immunocytochemistry in liquid based cervical cytology: useful as an adjunctive tool? J Clin Pathol 2003; 56:681-6. [PMID: 12944552 PMCID: PMC1770061 DOI: 10.1136/jcp.56.9.681] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
AIMS To test the ability of Ki-67 to detect cytological lesions in a screening setting and its use as a surrogate marker of human papillomavirus (HPV) infection. METHODS A study of liquid based cytology, HPV DNA testing by MY09/MY11 consensus polymerase chain reaction (PCR), type specific PCRs, and Ki-67 immunocytochemistry on a randomly selected series of 147 patients. RESULTS Comparison of the number of Ki-67 immunoreactive cells/1000 cells in the different cytological groups showed that the HSIL group yielded a significantly higher mean count than did the other groups. The number of Ki-67 immunoreactive cells/1000 cells was significantly higher in HPV-16 positive samples than in samples containing infections with other high risk types. Receiver operating characteristic curves indicated a test accuracy (area under curve) of 0.68, 0.72, and 0.86 for atypical squamous cells of undetermined significance (ASCUS), low grade squamous intraepithelial lesions (LSIL), and high grade squamous intraepithelial lesions (HSIL), respectively. Thresholds for 95% sensitivity were 0.07, 0.08, and 0.15 Ki-67 immunopositive cells/1000 cells for ASCUS, LSIL and HSIL, respectively. The threshold for 95% specificity was 1.9 Ki-67 immunopositive cells/1000 cells. CONCLUSIONS Ki-67 immunocytochemistry can be applied to liquid based cytology. The accuracy and diagnostic indices of the test are good when compared with those of other techniques. As part of a panel of screening procedures, it could be used as an adjunct to liquid based cytology to identify HSIL, and as a surrogate marker of HPV-16 infection.
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Affiliation(s)
- S Sahebali
- Department of Pathology, University of Antwerp, B-2610 Antwerp, Belgium
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Abstract
The causal relationship between genital human papillomavirus (HPV) infection and cervical dysplasia/carcinoma has been recognised for some time. The aim of this study was to document the occurrence and distribution of HPV infection in the five provinces of the Flemish region in Belgium and to correlate the HPV DNA test results with the cytological results on simultaneously performed thin layer preparations of cervical cells. Out of a total screened group of 105107 samples, 1978 samples with cytological abnormalities were tested for HPV DNA using the MY09/MY11 consensus PCR. The mean age of the whole group was 36.9 years. The LSIL group, with a mean age of 33.6 years, was significantly younger than the other groups. There was no significant difference in HPV prevalence among the provinces. In four out of five provinces the HPV prevalence reached 100% in high-grade lesions. There is a significant increase in predominance of high-risk HPV types, with increasing abnormal cytology (17.9% WNL < 51.1% ASCUS < 83.8% LSIL < 97.2% HSIL). Three peaks of HPV DNA positivity were observed, a first at 22 yrs (82%), a second at 47 yrs (60%) and a third in women older than 65 yrs (52%). These results shed more light on HPV prevalence in Flanders and show that the MY09/MY11 consensus primer based detection system is very suitable for the detection of HPV infections in Flanders.
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Affiliation(s)
- S Sahebali
- Dienst Anatomo-pathologie, Universiteit Antwerpen, 2610 Wilrijk, België
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Depuydt CE, Vereecken AJ, Salembier GM, Vanbrabant AS, Boels LA, van Herck E, Arbyn M, Segers K, Bogers JJ. Thin-layer liquid-based cervical cytology and PCR for detecting and typing human papillomavirus DNA in Flemish women. Br J Cancer 2003; 88:560-6. [PMID: 12592370 PMCID: PMC2377161 DOI: 10.1038/sj.bjc.6600756] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
The objective of this study was to document the occurrence and to correlate the prevalence of different human papillomavirus (HPV) types with the cytological results on simultaneously performed thin-layer preparations in a large population of Flemish women. During 1 year, 69 290 thin-layer preparations were interpreted using the Bethesda classification system. Using an algorithm for HPV testing based on consensus primers and type-specific PCRs in combination with liquid-based cytology, we determined the occurrence and distribution of 14 different oncogenic HPV types (16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, 66 and 68). Reflex HPV testing was performed on cytologically abnormal samples and on an age matched randomly selected control group with normal cervical cytology (n=1351). Correlation between cytology, age and prevalence for the 14 different high-risk HPV types is given. There is a significant increase in predominance of high-risk HPV types, with increasing abnormal cytology. Coinfection with multiple HPV types also increased with cytological abnormalities, and was highest in HSIL (16.7%). In Flanders, HSIL was most often associated with HPV types 16, 33, 35, 31, 18 and 51. Using thin-layer liquid-based cytology and PCR to detect HPV, it is feasible to screen large numbers of women.
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Affiliation(s)
- C E Depuydt
- Laboratory for Clinical Pathology (Labo RIATOL), Antwerp, Belgium.
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Tjalma WA, Weyler JJ, Bogers JJ, Pollefliet C, Baay M, Goovaerts GC, Vermorken JB, van Dam PA, van Marck EA, Buytaert PM. The importance of biological factors (bcl-2, bax, p53, PCNA, MI, HPV and angiogenesis) in invasive cervical cancer. Eur J Obstet Gynecol Reprod Biol 2001; 97:223-30. [PMID: 11451553 DOI: 10.1016/s0301-2115(00)00541-8] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVE The present study was designed to analyse the relationship between apoptosis related proteins (bcl-2 and bax), tumour suppressor protein p53, proliferation markers (PCNA and mitotic index), human papillomavirus (HPV) and angiogenesis in cervical cancer and their impact on clinical outcome. STUDY DESIGN Tumours from 111 patients were assessed by immunohistochemistry for the expression of bcl-2, bax, p53 and PCNA, by PCR for the presence of HPV-DNA, for the quantification of the mitotic index and the microvessel density (CD 31). The results were correlated with various histopathologic characteristics and survival. RESULTS The multiple Cox's regression analysis for overall survival of all prognostic variables gave as best model: bcl-2 (P<0.001), lymphovascular permeation (P=0.004), mitotic index (P=0.019), tumour grade (P=0.048) and FIGO stage (P=0.070). Subanalysis was performed for the patients where the lymph node status was known (n=79). Adding the lymph node status gave as best model for overall survival bcl-2 (P=0.001), lymphovascular permeation (P=0.003) and mitotic index (P=0.044). However, they hardly influenced the association. CONCLUSION In the apoptotic pathway of cervical cancer, bcl-2 is one of most important proteins. It can probably not only mediate cell death but also regulate cell growth. A better understanding of their relations will probably provide the basis for more rational cancer therapies in the future.
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Affiliation(s)
- W A Tjalma
- Laboratory of Cancer Research and Clinical Oncology, Antwerp University, Antwerp, Belgium.
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De Man JG, Moreels TG, De Winter BY, Bogers JJ, Van Marck EA, Herman AG, Pelckmans PA. Disturbance of the prejunctional modulation of cholinergic neurotransmission during chronic granulomatous inflammation of the mouse ileum. Br J Pharmacol 2001; 133:695-707. [PMID: 11429394 PMCID: PMC1572829 DOI: 10.1038/sj.bjp.0704115] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The effect of chronic granulomatous inflammation of the intestine was studied on the prejunctional modulation of cholinergic nerve activity in the mouse ileum. Contractions to carbachol (0.01 - 0.3 microM) and to electrical field stimulation (EFS, 0.25 - 8 Hz) of enteric neurons were higher in inflamed ileum as compared to control ileum. However, when the neurally-mediated contractions to EFS were expressed as percentage of the direct smooth muscle contraction to carbachol, the responses to EFS were similar in control and inflamed ileum. Atropine (1 microM) abolished all contractions to EFS and carbachol in control and inflamed ileum. DMPP (3 - 30 microM), a nicotinic receptor agonist, induced concentration-dependent contractions that were more pronounced in inflamed ileum as compared to control ileum. Hexamethonium (100 microM), a nicotinic receptor blocker, significantly inhibited the contractions to EFS in inflamed ileum but not in control ileum. In control ileum, histamine (10 - 100 microM) and the histamine H(1) receptor agonist HTMT (3 - 10 microM) inhibited the contractions to EFS concentration-dependently without affecting the contractions to carbachol. The inhibitory effect of histamine and HTMT was prevented by the histamine H(1) antagonist mepyramine (5 - 10 microM) but not by the H(2)- and H(3)-receptor antagonists cimetidine and thioperamide (both 10 microM). In chronically inflamed ileum however, histamine (10 - 100 microM) and HTMT (3 - 10 microM) failed to inhibit the contractions to EFS. The histamine H(2) and H(3) receptor agonists dimaprit and R(-)-alpha-methylhistamine did not affect the contractions to EFS in control and inflamed ileum. The alpha(2)-receptor agonist UK 14.304 (0.01 - 0.1 microM) inhibited the contractions to EFS in control and inflamed ileum without affecting the contractions to carbachol. The effect of UK 14.304 was reversed by the alpha(2)-receptor antagonist yohimbine (1 microM). The inhibitory effect of UK 14.304 on contractions to EFS was of similar potency in control and inflamed ileum. Our results suggest that the prejunctional modulation of cholinergic nerve activity by nicotinic and histaminic H(1) receptors is disturbed during chronic intestinal inflammation whereas the modulation by alpha(2)-receptors is preserved. Such a disturbance of cholinergic nerve activity may contribute to the motility disturbances that are often observed during chronic intestinal diseases in humans.
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Affiliation(s)
- Joris G De Man
- Division of Gastroenterology, Faculty of Medical and Pharmaceutical Sciences, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Tom G Moreels
- Division of Gastroenterology, Faculty of Medical and Pharmaceutical Sciences, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Benedicte Y De Winter
- Division of Gastroenterology, Faculty of Medical and Pharmaceutical Sciences, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Johannes J Bogers
- Division of Pathology, Faculty of Medical and Pharmaceutical Sciences, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Eric A Van Marck
- Division of Pathology, Faculty of Medical and Pharmaceutical Sciences, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Arnold G Herman
- Division of Pharmacology, Faculty of Medical and Pharmaceutical Sciences, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Paul A Pelckmans
- Division of Gastroenterology, Faculty of Medical and Pharmaceutical Sciences, University of Antwerp (UIA), Universiteitsplein 1, B-2610 Wilrijk, Belgium
- Author for correspondence: .
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Bogers JJ, Storey PA, Faile G, Hewitt E, Yelifari L, Polderman A, Van Marck EA. Human oesophagostomiasis: a histomorphometric study of 13 new cases in northern Ghana. Virchows Arch 2001; 439:21-6. [PMID: 11499836 DOI: 10.1007/s004280100436] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Oesophagostomiasis is an infrequently described and recognised parasitic infection in humans, caused by Oesophagostomum bifurcum. Although the disease is most often found in the northern part of Togo and the neighbouring part of Ghana, sporadic cases have been described in other parts of Africa and in Asia and South America: Uganda, Ivory Coast, Sudan, Kenya, Ethiopia, Indonesia, Malaysia and Brazil. Infection probably occurs by way of the ingestion of L3 larvae. These larvae penetrate the intestinal wall, especially that of the colon. Some of these larvae develop into young adult worms and return to the bowel lumen. Other larvae, however, develop into immature worms, which fail to settle in the lumen, forming abscesses in the bowel wall and causing pathology. In the literature 105 human cases have been described, many originating in the northern regions of Ghana and Togo. The present study was performed to evaluate 13 new cases originating in the northern part of Ghana (7 female and 6 male patients, aged between 2 and 60 years). Histopathologically, the patients could be divided into two groups: the first group showed multinodular disease, while patients in the second group presented with a single, nodular mass. In the first group, abscesses were seen throughout the colonic wall. The mean size of the cavities was 4.3+/-0.7 mm. There was no relation between the size and the localisation in the colonic wall. Abscesses were significantly larger in male patients than in female patients. There was no correlation with age. In the second group, histopathological examination showed a cyst of variable wall thickness with very limited inflammation. These cysts represented older lesions, often encapsulated in the mesentery. In conclusion, in this study we present 13 new cases of human oesophagostomiasis. The abscess formation was found to be organ specific, independent of age, and gender-related, producing a more intense tissue reaction in male patients.
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Affiliation(s)
- J J Bogers
- Laboratory of Pathology, University Hospital Antwerp, University of Antwerp, Edegem, Belgium
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Moreels TG, De Man JG, Bogers JJ, De Winter BY, Vrolix G, Herman AG, Van Marck EA, Pelckmans PA. Effect of Schistosoma mansoni-induced granulomatous inflammation on murine gastrointestinal motility. Am J Physiol Gastrointest Liver Physiol 2001; 280:G1030-42. [PMID: 11292613 DOI: 10.1152/ajpgi.2001.280.5.g1030] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
In Schistosoma mansoni-infected mice, gastrointestinal transit was measured in vivo and the neuromuscular function of longitudinal muscle strips of inflamed ileum and noninflamed gastric fundus was assessed in vitro. Eight weeks after infection, the ileal wall was acutely inflamed, as shown by a mucosal inflammatory infiltrate, leading to an increase in mucosal thickness, in myeloperoxidase (MPO) activity, and in interleukin (IL)-1beta production. At that time, both gastrointestinal transit and in vitro ileal contractility were normal. Twelve weeks after infection, chronic granulomatous inflammation led to proliferation of the muscle layer and to a further increase in MPO activity, whereas IL-1beta production normalized. Gastrointestinal transit was decreased, whereas in vitro ileal contractility was increased irrespective of the contractile stimulus. In vitro incubation with IL-1beta (10 ng/ml for 60 min) significantly increased ileal contractility only at 8 wk after infection. Indomethacin, tetrodotoxin, and atropine had no differential effect on ileal contractility in controls and infected mice. In vitro contractility of noninflamed gastric fundus was normal both 8 and 12 wk after infection. We conclude that intestinal schistosomiasis 8 wk after infection is associated only with structural changes of the ileum, whereas 12 wk after infection, both structural and functional changes are present. These changes are characterized by increased ileal wall thickness, decreased gastrointestinal transit, and increased smooth muscle contractility restricted to the inflamed gut segment.
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Affiliation(s)
- T G Moreels
- Division of Gastroenterology, Faculty of Medicine, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium
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Royers R, Jacobs W, Bogers JJ, Deelder AM, Van Marck E. Study of the distribution pattern of Schistosoma haematobium egg antigens recognised by six different monoclonal antibodies in the parasite and the host. Parasite 2000; 7:297-303. [PMID: 11147038 DOI: 10.1051/parasite/2000074297] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Recently a new panel of monoclonal antibodies was developed against soluble egg antigens in the hatching fluid of Schistosoma mansoni. These antibodies have been used to develop an improved ELISA for the detection of circulating soluble egg antigens in serum and urine that would have a higher sensitivity in the immunodiagnosis of S. mansoni infections. Although these antibodies showed no improvement in the immunodiagnosis of S. mansoni infections compared with egg antigen-based ELISAs already described (Nourel Din et al., 1994a), they may have a potential role in the identification of S. haematobium infections. This study has looked into the immunolocalisation of S. haematobium egg antigens in both the parasite and the host as recognised by four newly developed monoclonal antibodies (290-2D9-A, 290-2E6-A, 290-2H12-A and 290-4A8-A) and two already described antibodies (114-5B1-A and 114-4D12-A). The antibodies 114-5B1-A and 114-4D12-A appeared to have in S. haematobium eggs a similar staining pattern when compared to S. mansoni eggs. The antibodies prepared against the hatching fluid showed a characteristic signal, especially 290-2E6-A. These antibodies recognised a component originating from the lateral glands of the miracidium. In the host a similar immunohistochemical tissue localisation pattern (mainly phagocytising reticulo-endothelial cells) was seen as previously described for S. mansoni infected hamsters.
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Affiliation(s)
- R Royers
- Laboratory of Pathology, University of Antwerp (UIA), Wilrijk, Belgium
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35
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De Backer AI, De Schepper AM, Michielsen PP, De Maeyer M, Bogers JJ, Vaneerdeweg W. Hepatobiliary cystadenoma with mesenchymal stroma mimicking hydatid cyst. Report of a case. Acta Gastroenterol Belg 2000; 63:317-20. [PMID: 11190002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
We report on a case of hepatobiliary cystadenoma with mesenchymal stroma in a 44-year-old Caucasian woman who presented with upper abdominal discomfort. Ultrasound (US) and computed tomography (CT) showed a cystic mass resembling hydatid cyst. Endoscopic retrograde cholangiography (ERC) demonstrated communication with the left hepatic duct. At surgery, a cystic mass with communication to the left hepatic duct was found and resected en bloc with a margin of normal liver tissue. Histological examination showed a hepatobiliary cystadenoma with mesenchymal stroma.
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Affiliation(s)
- A I De Backer
- Department of Radiology, University Hospital Antwerp, Wilrijkstraat 10, B-2650 Edegem, Belgium
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36
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De Block CE, De Leeuw IH, Pelckmans PA, Michielsen PP, Bogers JJ, Van Marck EA, Van Gaal LF. Autoimmune hepatitis, autoimmune gastritis, and gastric carcinoid in a type 1 diabetic patient: a case report. J Diabetes Complications 2000; 14:116-20. [PMID: 10959074 DOI: 10.1016/s1056-8727(00)00059-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The history of a 45-year-old male type 1 diabetic patient is presented. At the age of 29 years, he was diagnosed to have an autoimmune hepatitis with incipient liver cirrhosis. Five years later, a successful liver/pancreas transplantation was performed. Eighteen months later, however, pancreatic insufficiency occurred due to thrombosis of the pancreatic graft. Besides these conditions, iron deficiency, pernicious anemia, and autoimmune gastritis were also diagnosed. Serum parietal cell antibodies (PCA) and intrinsic factor antibodies (AIF) were positive. At 45, this patient was found to have a gastric carcinoid tumor. The clinical importance of PCA is discussed with regard to chronic atrophic gastritis and pernicious anemia, which both predispose toward gastric carcinoid tumors. Autoimmune type 1 diabetic patients who have a high prevalence of PCA should be screened for gastric autoimmune manifestations and tumors, as the history of this patient illustrates.
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Affiliation(s)
- C E De Block
- Department of Endocrinology-Diabetology, Faculty of Medicine, University of Antwerp (UA), University Hospital Antwerp, Edegem, Belgium.
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Bogers JJ, Somville J, Jeuris W, Van Marck EA. Chronic malleolar swelling: a rare diagnosis. Acta Clin Belg 1999; 54:13-4. [PMID: 10192970 DOI: 10.1080/17843286.1999.11754201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- J J Bogers
- Department of Pathology, University Hospital Antwerp, Edegem Belgium
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Abstract
Adhesion molecules constitute essential elements in inflammation, mediating various cellular interactions. We investigated the expression of adhesion molecules mediating cell-cell [intercellular adhesion molecule-1 (ICAM-1) and lymphocyte function-associated antigen-1 (LFA-1)] and cell-matrix interactions [very late antigen-4 (VLA-4), VLA-6, and syndecan-1] in intestinal granulomas of mice infected with the parasite Schistosoma mansoni. Up-regulation of ICAM-1, LFA-1, and VLA-4 was seen in ileal and colonic granulomas, at both the acute (8 weeks postinfection) and the chronic stage (13-16 weeks postinfection). Up-regulation of VLA-6 was absent in all intestinal granulomas. Syndecan-1 immunoreactive (antigen-driven) B-lymphocytes were seen in the proximity of egg-antigen-laden macrophages in the inner part of ileal and colonic granulomas, although B-cells are considered to be absent in ileal granulomas. Estimation of intestinal granuloma volumes demonstrated the lack of down-modulation observed in ileal granulomas. From our results we infer that adhesion molecules constitute important elements in schistosomal intestinal granuloma formation. Organ-related differences between hepatic and intestinal granulomas exist (e.g., granuloma volume), but these differences are not morphologically reflected in a differential expression of the adhesion molecules ICAM-1, LFA-1, and VLA-4. Syndecan-1 immunoreactive B-lymphocytes also appear to be involved in ileal granuloma formation.
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Affiliation(s)
- W Jacobs
- Department of Pathology, University of Antwerp, Wilrijk, Belgium
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Bogers JJ, Nibbeling HA, Deelder AM, van Marck EA. Immunohistochemical and ultrastructural localization of Schistosoma mansoni soluble egg antigens processed by the infected host. Parasitology 1996; 112 ( Pt 6):537-43. [PMID: 8684828 DOI: 10.1017/s0031182000066117] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The detection of egg-derived antigens in the serum and urine of Schistosoma mansoni-infected individuals and experimental animals would provide an alternative method to assess the tissue egg burden. The detected levels are, however, not only a function of the amounts of antigen produced, but also of the processing or clearance by the host. In the present study the immunolocalization pattern of antigens using 2 recently described monoclonal antibodies to repetitive carbohydrate epitopes of S. mansoni soluble egg antigen (114-5B1-A and 114-4D12-A) in various organs of the host was investigated. In the liver strong immunoreactivity could be detected around the entrapped eggs and in egg-shells, as well as in Kupffer cells accumulating both antigen and schistosomal pigment. In the spleen, immunohistochemistry revealed antigen in the plasma as well as in secondary lysosomes of macrophages. Strong labelling was found in the vesicles of the eosinophilic granulocytes: indirect evidence perhaps for the presence of antigen-antibody complexes. In conclusion, the secreted egg antigens were sequestered in the reticulo-endothelial macrophages of the liver and the spleen as already partly described for worm-derived antigens. The presence of large quantities of antigenic material in the spleen could suggest an important role of this organ in the clearance of antigen and might even provide an additional explanation for the hepatosplenomegaly mainly present in S. mansoni-infected children.
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Affiliation(s)
- J J Bogers
- Laboratory of Pathology, University of Antwerp (UIA), Wilrijk, Belgium
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Bogers JJ, Nibbeling HA, Deelder AM, van Marck EA. Quantitative and morphological aspects of Unicryl versus Lowicryl K4M embedding in immunoelectron microscopic studies. J Histochem Cytochem 1996; 44:43-8. [PMID: 8543781 DOI: 10.1177/44.1.8543781] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
In this study we compared the recently commercialized electron microscopy embedding resin Unicryl with the well-known resin Lowicryl K4M with regard to morphological and immunohistochemical preservation properties. The standard embedding procedure recommended by the manufacturer for the use of Unicryl resulted in considerable morphological alterations of the tissue, with the appearance of large gaps in and between the cells of the examined tissue. Morphometric analysis pointed to a swelling of the extracellular matrix as the main cause of these morphological artifacts. A slight modification in the protocol to correct this artifact is proposed and tested. Immunohistochemically, tissue embedded in Unicryl resulted in a significantly stronger immunogold labeling than identical tissue embedded in Lowicryl K4M. From the results of this technical study, it can be concluded that Unicryl embedding is a valuable new tool to supplement the available techniques for immunoelectron microscopic studies.
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Affiliation(s)
- J J Bogers
- Laboratory of Pathology, University of Antwerp (UIA), Belgium
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Bogers JJ, Nibelling HA, Singh SK, Deelder AM, Van Marck EA. Ultrastructural immunolocalization of two circulating egg antigens in miracidia of Schistosoma mansoni. Parasitology 1995; 110 ( Pt 4):365-70. [PMID: 7753577 DOI: 10.1017/s0031182000064702] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In the present study ultrastructural immunocytochemical techniques have been used to localize the cells producing two soluble egg antigens present in the hatching fluid of Schistosoma mansoni, using two recently described monoclonal antibodies (MAbs). In the miracidium of S. mansoni, the one apical and the two lateral unicellular glands showed immunoreactivity for the egg antigens, using a post-embedding immunogold technique. Immunoreactivity was associated with the contents of vesicles for both the MAbs, although the intravesicular distribution was not identical. This difference in ultrastructural staining pattern provides additional evidence that the two MAbs are binding with different epitopes of the same antigen or with different antigens altogether. The finding of free unbound label around the embedded miracidium is consistent with secretion having been released from the glands.
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Affiliation(s)
- J J Bogers
- Laboratory of Pathology, University of Antwerp (UIA), Wilrijk, Belgium
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Bogers JJ, Nibbeling HA, Van Marck EA, Deelder AM. Immunoelectron microscopical localization of a circulating antigen in the excretory system of Schistosoma mansoni. Ultrastructural localization studies of the excretory system of S. mansoni. Parasitol Res 1995; 81:375-81. [PMID: 7501635 DOI: 10.1007/bf00931497] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
In this study the excretory system of Schistosoma mansoni was ultrastructurally examined with a recently described monoclonal antibody (mAb) against a circulating antigen. In previous studies this mAb was found to have affinity for the excretory system. Strong immunoreactivity was found on the flagella of the flame cells and of the collecting ducts throughout the worm. The eggshell and the space between the miracidium and the eggshell showed strong reactivity with a declining gradient towards the exterior, suggesting a secretion process. In cercariae, immunoreactivity was restricted to the tegument, whereas in schistosomula the labeling pattern resembled that of the adult worm, demonstrating positive reactivity of the flame cells and no immunostaining of the tegument. This stage-dependent differential expression of different antigens in the excretory system and in the tegument could suggest a maturation process of the excretory system.
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Affiliation(s)
- J J Bogers
- Laboratory of Pathology, Medical Faculty, University of Antwerp UIA, Wilrijk, Belgium
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Bogers JJ, Nibbeling HA, van Marck EA, Deelder AM. Immunofluorescent visualization of the excretory and gut system of Schistosoma mansoni by confocal laser scanning microscopy. Am J Trop Med Hyg 1994; 50:612-9. [PMID: 8203712 DOI: 10.4269/ajtmh.1994.50.612] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Conventional epifluorescence microscopy (CEM) and confocal laser scanning microscopy (CLSM) were used to visualize the excretory system and the gut on whole organisms of different life-cycle stages of Schistosoma mansoni. To visualize the gut system, an anti-circulating anodic antigen (CAA) monoclonal antibody (MAb) (120-1B10-A) was used, whereas the excretory system was immunohistochemically stained with an anti-flame cell MAb (51-4H8-A) and with a recently described anti-egg MAb (114-5B1-A). The CEM procedure resulted in clear images at low magnification but the signal-to-noise ratio on the higher magnification images was very poor. Using CLSM on the adult worm, the 114-581-A MAb demonstrated a well-defined system of canals that could be morphologically identified as the excretory system. The flame cells terminating the branches of the excretory canals showed a clear immunoreactivity with the 114-5B1-A MAb as well as with the specific flame cell MAb. The gut system could be visualized, using an anti-CAA MAb, as two well-defined bands throughout the length of the parasite. Application of the 114-5B1-A MAb on cercariae revealed a strong fluorescence on the cercarial surface, whereas no immunoreactivity could be detected on internal structures. Whole eggs showed a bright fluorescence of the egg shell, whereas miracidia showed immunoreactivity of the germinal cells located in the center of the organism. The CLSM procedure, especially with the recently introduced fast photon-counting option, provides a superior tool to investigate the three-dimensional localization of different epitopes on immunofluorescently stained whole mounts of multicellular organisms in comparison with CEM.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- J J Bogers
- Laboratory of Pathology, Medical Faculty, University of Antwerp, (UIA), Wilrijk, Belgium
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Bogers JJ, Timmermans JP, Scheuermann DW, Pelckmans PA, Mayer B, van Marck EA. Localization of nitric oxide synthase in enteric neurons of the porcine and human ileocaecal junction. Ann Anat 1994; 176:131-5. [PMID: 7516124 DOI: 10.1016/s0940-9602(11)80430-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Recent studies, using pharmacological or indirect morphological techniques, suggest that the non-adrenergic non-cholinergic (NANC) control of the ileocaecal junction (ICJ) is largely regulated by nitric oxide (NO). In this study, NO synthase (NOS) has been localized immunocytochemically and enzyme histochemically, using NADPH-diaphorase (NADPH-d), in enteric neurons of the myenteric and submucous plexuses of the ICJ of man and pig. The myenteric plexus, as well as the outer submucous plexus of both the porcine and the human ICJ, harboured NOS-containing neurons, which varied widely in size and shape, but which all displayed a multidendritic, uniaxonal appearance. Compared to the myenteric plexus, significantly fewer NOS-containing neurons were encountered in the outer submucous plexus. Neurofilament immunohistochemistry following NADPH-d application made it possible to distinguish a variety of cells that stained for both markers. Some of the larger neurons were of the Dogiel type-I morphology, whereas others showed a type III or a type VI-like morphology. A large number of NOS-immunoreactive nerve fibers were detected in the enlarged circular muscle of the ICJ and in the adjacent ileum. No NOS staining was detected in the smooth muscle cells of the outer circular or longitudinal muscle layer. The latter finding, together with the abundance of NOS positive nerve fibers in the smooth muscle layer, suggest a neuronal origin for NO as an important inhibitory neurotransmitter in the ICJ.
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Affiliation(s)
- J J Bogers
- Laboratory of Pathology, University of Antwerp (UIA), Belgium
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Schoof PH, Cromme-Dijkhuis AH, Bogers JJ, Thijssen EJ, Witsenburg M, Hess J, Bos E. Aortic root replacement with pulmonary autograft in children. J Thorac Cardiovasc Surg 1994; 107:367-73. [PMID: 8302055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Between September 1988 and February 1993, 14 patients whose ages ranged from 3 months to 16 years (mean 11.1 +/- 4.3 years) underwent replacement of the aortic root with the autologous pulmonary root for aortic valve disease. The follow-up was 4 years (cumulative total of 25.2 patient-years). There was no early mortality. Late mortality (one patient) was 7.1% (95% confidence limits 0% to 21%). This patient had juvenile rheumatoid arthritis and died of consequent congestive heart failure with autograft failure 6 months after operation. Event-free survival after 4 years was 78.6% (95% confidence limits 50% to 95%). One patient was reoperated on because of autograft failure caused by a relapse of rheumatic fever. One patient operated on for critical neonatal aortic stenosis has subnormal exercise tolerance because of restrictive cardiomyopathy and pulmonary homograft regurgitation. The other 12 patients were in New York Heart Association functional class I at the end of follow-up. There was no prevalence of bacterial endocarditis. There were no signs of primary structural degeneration of the pulmonary autograft. During follow-up, in eight patients, increased anulus diameter of the pulmonary autograft could be demonstrated by precordial two-dimensional echocardiography, suggesting growth of the autograft. Our experience shows that aortic root replacement with the pulmonary autograft can be done with low mortality and morbidity in children with aortic valve disease. The operation seems to be contraindicated in children with juvenile rheumatoid arthritis because of the risk of recurrence of rheumatic disease in the autograft. The pulmonary autograft has also been shown to be susceptible to recurrence of rheumatic inflammation in children with a history of acute rheumatic fever. Despite pulmonary autograft replacement of the aortic valve in infants with critical valvular aortic stenosis and endocardial fibroelastosis, clinical results may be poor. Growth of the autograft is suggested by echocardiographic follow-up. We consider aortic root replacement with the pulmonary autograft the procedure of choice in children who require aortic valve replacement.
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Affiliation(s)
- P H Schoof
- Department of Cardiothoracic Surgery, University Hospital Dijkzigt, Rotterdam, The Netherlands
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Timmermans JP, Barbiers M, Scheuermann DW, Bogers JJ, Adriaensen D, Fekete E, Mayer B, Van Marck EA, De Groodt-Lasseel MH. Nitric oxide synthase immunoreactivity in the enteric nervous system of the developing human digestive tract. Cell Tissue Res 1994; 275:235-45. [PMID: 7509262 DOI: 10.1007/bf00319421] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We have investigated indirectly the presence of nitric oxide in the enteric nervous system of the digestive tract of human fetuses and newborns by nitric oxide synthase (NOS) immunocytochemistry and nicotinamide adenine dinucleotide phosphate diaphorase (NADPHd) histochemistry. In the stomach, NOS immunoactivity was confined to the myenteric plexus and nerve fibres in the outer smooth musculature; few immunoreactive nerve cell bodies were found in ganglia of the outer submucous plexus. In the pyloric region, a few nitrergic perikarya were seen in the inner submucous plexus and some immunoreactive fibers were found in the muscularis mucosae. In the small intestine, nitrergic neurons clustered just underneath or above the topographical plane formed by the primary nerve strands of the myenteric plexus up to the 26th week of gestation, after which stage, they occurred throughout the ganglia. Many of their processes contributed to the dense fine-meshed tertiary nerve network of the myenteric plexus and the circular smooth muscle layer. NOS-immunoreactive fibres directed to the circular smooth muscle layer originated from a few NOS-containing perikarya located in the outer submucous plexus. In the colon, caecum and rectum, labelled nerve cells and fibres were numerous in the myenteric plexus; they were also found in the outer submucous plexus. The circular muscle layer had a much denser NOS-immunoreactive innervation than the longitudinally oriented taenia. The marked morphological differences observed between nitrergic neurons within the developing human gastrointestinal tract, together with the typical innervation pattern in the ganglionic and aganglionic nerve networks, support the existence of distinct subpopulations of NOS-containing enterice neurons acting as interneurons or (inhibitory) motor neurons.
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Affiliation(s)
- J P Timmermans
- Department of Morphology, University of Antwerp (RUCA), Belgium
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Bogers JJ, Van Marck E. The ileocaecal junction. Histol Histopathol 1993; 8:561-6. [PMID: 8358165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The ileocaecal junction remains a controversial region of the gut. There are still a lot of questions concerning its anatomical structure and function. In this review, a concise overview is given of the recent and older literature on the embryology, anatomy, including the intrinsic and extrinsic innervation, and the pharmacology of this region. Based on the available data from the literature, evidence is accumulating for a sphincteric function.
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Affiliation(s)
- J J Bogers
- Laboratory of Pathological Anatomy, University of Antwerp (UIA), Belgium
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Abstract
Although recommended by several investigators, the benefit of early surgery in patients with fixed subaortic stenosis has not been proved. Findings were reviewed of 57 patients with isolated fixed subaortic stenosis, including 27 surgically treated patients, with special emphasis on the occurrence of aortic regurgitation during a mean follow-up period of 6.7 years. The number of patients with aortic regurgitation increased preoperatively in the total group (23% at diagnosis to 54% after 3.7 years of follow-up). The prevalence of aortic regurgitation in the 27 surgically treated patients was higher (81%) than that in the nonsurgically treated group but remained unchanged after a mean postoperative period of 4.7 years. In all patients but one, aortic regurgitation remained of minor hemodynamic significance. One patient died during follow-up. After surgery, 15 patients (55%) showed a relapse; 11 redeveloped a subvalvular pressure gradient greater than 30 mm Hg and discrete subvalvular ridges (range 6 months to 24 years after surgery, mean 7 years). In those patients with fixed subaortic stenosis, follow-up did not reveal any benefit from early surgery. The unpredictable course and sometimes very severe progression of this disease make frequent and careful follow-up necessary.
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Affiliation(s)
- A G de Vries
- Department of Pediatrics, Sophia Children's Hospital, University Hospital, Rotterdam, The Netherlands
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Bogers JJ, Pelckmans PA, Boeckxstaens GE, De Man JG, Herman AG, Van Maercke YM. The role of nitric oxide in serotonin-induced relaxations in the canine terminal ileum and ileocolonic junction. Naunyn Schmiedebergs Arch Pharmacol 1991; 344:716-9. [PMID: 1663590 DOI: 10.1007/bf00174756] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The role of nitric oxide (NO) in 5-HT-induced non-adrenergic non-cholinergic (NANC) relaxations was studied on circular muscle strips of the canine ileocolonic junction (ICJ) and terminal ileum. During an acetylcholine-induced contraction, NO (10(-5) M) evoked a transient relaxation, whereas 5-HT (10(-4) M) caused an initial NANC relaxation followed by a contraction. This initial relaxation to 5-HT, but not the relaxation to NO, was significantly inhibited by the stereospecific inhibitors of the NO biosynthesis NG-monomethyl-L-arginine (L-NMMA) and NG-nitro-L-arginine (L-NNA). L-arginine, but not D-arginine, prevented the inhibitory effect of L-NMMA and L-NNA. The enantiomer of L-NMMA, D-NMMA, had no effect. Hemoglobin abolished the NO-induced relaxations and significantly inhibited the relaxation to 5-HT. From these experiments it is concluded that the 5-HT-induced NANC relaxation is mediated by NO or a NO releasing substance.
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Affiliation(s)
- J J Bogers
- Division of Gastroenterology, Faculty of Medicine, University of Antwerp (UIA), Belgium
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Boeckxstaens GE, Pelckmans PA, Bogers JJ, Bult H, De Man JG, Oosterbosch L, Herman AG, Van Maercke YM. Release of nitric oxide upon stimulation of nonadrenergic noncholinergic nerves in the rat gastric fundus. J Pharmacol Exp Ther 1991; 256:441-7. [PMID: 1671594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The possible role of nitric oxide (NO) as inhibitory nonadrenergic noncholinergic (NANC) neurotransmitter was studied in the rat gastric fundus. NO induced tetrodotoxin-resistant NANC relaxations in longitudinal muscle strips similar to those induced by electrical stimulation. Incubation with the stereospecific inhibitors of the NO biosynthesis NG-monomethyl-L-arginine (L-NMMA) and NG-nitro-L-arginine (L-NNA) resulted in an increase of the basal tension which was reversed partly by L-arginine, but not by D-arginine. L-NMMA and L-NNA inhibited the relaxations to electrical stimulation, but not those induced by ATP, vasoactive intestinal polypeptide (VIP), norepinephrine or NO. This inhibitory effect was prevented by L-arginine, but not by D-arginine. In a second series of experiments, the gastric fundus served as donor tissue in a superfusion bioassay with de-endothelialized rings of rabbit aorta as detector tissue. The fundus released a labile factor with vasodilator activity upon electrical stimulation. This release was inhibited by tetrodotoxin and L-NNA, whereas it was increased by L-arginine. The biological activity was enhanced by superoxide dismutase and eliminated by hemoglobin. Our results indicate that NO is formed and released upon brief stimulation of the NANC nerves in the rat gastric fundus which is essential for the transient relaxations in this preparation. Therefore, we suggest NO or a NO releasing substance as inhibitory NANC transmitter in the rat gastric fundus.
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Affiliation(s)
- G E Boeckxstaens
- Division of Gastroenterology, Faculty of Medicine, University of Antwerp (UIA), Belgium
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