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Pacaud M, Kervarrec T, Masliah-Planchon J, Tallet A, Collin C, Guyetant S, Gatault P, Perrin P, Olagne J, Etienne I, Francois A, Golbin L, Le Naoures C, Moal MC, Doucet L, Rerolle JP, Guillaudeau A, Chatelet V, Comoz F, Westeel PF, Cordonnier C, Miquelestorena-Standley E, Touze A, Arnold F, Samimi M, Buchler M. Merkel cell carcinoma from renal transplant recipients are mostly MCPyV-negative and are frequently associated with squamous cell carcinomas or precursors. J Eur Acad Dermatol Venereol 2023. [PMID: 37010111 DOI: 10.1111/jdv.19076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 03/14/2023] [Indexed: 04/04/2023]
Affiliation(s)
- Margaux Pacaud
- Department of Nephrology, Université de Tours, Centre Hospitalier Universitaire de Tours, Tours, France
| | - Thibault Kervarrec
- Department of Pathology, Université de Tours, Centre Hospitalier Universitaire de Tours, Chambray-les-tours, France
- "Biologie des infections à polyomavirus" team, UMR INRA ISP 1282, Université de Tours, Tours, France
| | | | - Anne Tallet
- Platform of Somatic Tumor Molecular Genetics, Université de Tours, Centre Hospitalier Universitaire de Tours, Chambray-les-tours, France
| | - Christine Collin
- Platform of Somatic Tumor Molecular Genetics, Université de Tours, Centre Hospitalier Universitaire de Tours, Chambray-les-tours, France
| | - Serge Guyetant
- Department of Pathology, Université de Tours, Centre Hospitalier Universitaire de Tours, Chambray-les-tours, France
- "Biologie des infections à polyomavirus" team, UMR INRA ISP 1282, Université de Tours, Tours, France
- Platform of Somatic Tumor Molecular Genetics, Université de Tours, Centre Hospitalier Universitaire de Tours, Chambray-les-tours, France
| | - Philippe Gatault
- Department of Nephrology, Université de Tours, Centre Hospitalier Universitaire de Tours, Tours, France
| | - Peggy Perrin
- Department of Nephrology and Transplantation, Strasbourg University Hospital, Strasbourg, France
| | - Jerome Olagne
- Department of Nephrology and Transplantation, Strasbourg University Hospital, Strasbourg, France
- Department of Pathology, Hôpital de Hautepierre, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Isabelle Etienne
- Department of Nephrology, Transplantation and Hemodialysis, Rouen University Hospital, Rouen, France
| | - Arnaud Francois
- Department of Pathology, Rouen University Hospital, Rouen, France
| | - Leonard Golbin
- Department of Nephrology, Rennes University Hospital, Rennes, France
| | | | | | - Laurent Doucet
- Pathology Department, University Hospital, 29200, Brest, France
| | - Jean-Philippe Rerolle
- Department of Nephrology and Transplantation, University of Limoges, Limoges, France
| | | | | | | | | | - Carole Cordonnier
- Department of Pathology, Amiens University Medical Center, Amiens, France
| | | | - Antoine Touze
- Platform of Somatic Tumor Molecular Genetics, Université de Tours, Centre Hospitalier Universitaire de Tours, Chambray-les-tours, France
| | - Francoise Arnold
- Platform of Somatic Tumor Molecular Genetics, Université de Tours, Centre Hospitalier Universitaire de Tours, Chambray-les-tours, France
| | - Mahtab Samimi
- Platform of Somatic Tumor Molecular Genetics, Université de Tours, Centre Hospitalier Universitaire de Tours, Chambray-les-tours, France
- Dermatology Department, Université de Tours, CHU de Tours, Chambray-les-tours, France
| | - Matthias Buchler
- Department of Nephrology, Université de Tours, Centre Hospitalier Universitaire de Tours, Tours, France
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Lantier L, Poupée-Beaugé A, Tommaso AD, Ducournau C, Germon S, Lee GS, Touze A, moiré N, Dimier-Poisson I. Abstract 1712: Neospora caninum: An immunotherapeutic protozoan against cancer. Cancer Res 2021. [DOI: 10.1158/1538-7445.am2021-1712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Background: Immunotherapy induces, provides, and/or reactivates anti-tumor immune responses. Some microorganisms also can initiate response that lyzes infected tumor and/or stimulates systemic immunity. Attenuated viruses or bacteria are well studied as oncotherapeutics, but no protozoa except Toxoplasma gondii. We assessed the effect on tumors of other protozoa that were naturally non-pathogenic to humans. Thus, we discovered the ability to use Neospora caninum (Nc) in a manner and form that demonstrated a synergistic array of pertinent immunotherapeutic characteristics against solid cancers. We report on the most recent data notably from Nc engineered to secrete human IL-15 within the tumor.
Methods: In vitro, the immunostimulatory properties of Nc strains wildtype and engineered to secrete human IL-15 were studied. In vivo experiments of treatment with of Nc tachyzoites administered locally (intra and peri tumoral) or remotely (subcutaneous) in a murine thymoma EG7 tumor and in human Merkel cell carcinoma (MCC).
Results: We demonstrated that the treatment of thymoma EG7 by Nc strongly inhibited tumor development. Analysis of immune responses and interactions between Nc and tumor cells showed that Nc had the ability to lyze infected cancer cells, reactivated immune competence within the tumor microenvironment (TME), and activated the systemic immune system by promoting the recruitment of immune cells to the site of tumor. We also established in a NOD/SCID mouse model that Nc was able to induce a strong regression of human MCC. Recently, to further enhance oncotherapeutic effect, we engineered an Nc strain to secrete human IL-15 (cross reactive with mouse cells), associated with alpha subunit of IL-15 receptor, increasing its stability. This strain induced proliferation of human PBMCs and their secretion of IFN-γ. In the EG7 model, human IL-15 secreting Nc showed greater protection against tumor development, confirming enhancement of immunotherapy by engineering Nc to deliver/secrete IL-15.
Conclusion: These results highlight Neospora caninum as a potentially extremely efficient, and non-toxic anti-cancer agent, capable of being engineered to express at its surface or to secrete bio-drugs, like human IL-15 cytokine. Our work has identified the broad clinical possibilities of using N. caninum as an oncolytic protozoan in human medicine capable of vectoring molecular therapy, overcoming TME defenses.
Citation Format: Louis Lantier, Agathe Poupée-Beaugé, Anne Di Tommaso, Céline Ducournau, Stéphanie Germon, Gordon S. Lee, Antoine Touze, Nathalie moiré, Isabelle Dimier-Poisson. Neospora caninum: An immunotherapeutic protozoan against cancer [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2021; 2021 Apr 10-15 and May 17-21. Philadelphia (PA): AACR; Cancer Res 2021;81(13_Suppl):Abstract nr 1712.
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Aleissa M, Konstantinou MP, Samimi M, Lamant L, Gaboriaud P, Touze A, Ceppi C, Bulai Livideanu C, Paul C. Trichodysplasia spinulosa associated with HIV infection: clinical response to acitretin and valganciclovir. Clin Exp Dermatol 2017; 43:231-233. [PMID: 29028114 DOI: 10.1111/ced.13286] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/26/2017] [Indexed: 11/26/2022]
Affiliation(s)
- M Aleissa
- Paul Sabatier University, University Hospitals of Toulouse, Toulouse, France.,Department of Dermatology, University Hospitals of Toulouse, Toulouse, France
| | - M P Konstantinou
- Paul Sabatier University, University Hospitals of Toulouse, Toulouse, France.,Department of Dermatology, University Hospitals of Toulouse, Toulouse, France
| | - M Samimi
- Unité Mixte de Recherche 1282 Infectiologie et Santé Publique, Centre Hospitalier Universitaire Tours, Université François Rabelais, Tours, France.,Department of Dermatology, Centre Hospitalier Universitaire Tours, Université François Rabelais, Tours, France
| | - L Lamant
- Paul Sabatier University, University Hospitals of Toulouse, Toulouse, France.,Department of Histopathology, University Hospitals of Toulouse, Toulouse, France
| | - P Gaboriaud
- Unité Mixte de Recherche 1282 Infectiologie et Santé Publique, Centre Hospitalier Universitaire Tours, Université François Rabelais, Tours, France
| | - A Touze
- Unité Mixte de Recherche 1282 Infectiologie et Santé Publique, Centre Hospitalier Universitaire Tours, Université François Rabelais, Tours, France
| | - C Ceppi
- Department of Internal Medicine, University Hospital of Nice, Nice, France
| | - C Bulai Livideanu
- Paul Sabatier University, University Hospitals of Toulouse, Toulouse, France.,Department of Dermatology, University Hospitals of Toulouse, Toulouse, France
| | - C Paul
- Paul Sabatier University, University Hospitals of Toulouse, Toulouse, France.,Department of Dermatology, University Hospitals of Toulouse, Toulouse, France
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Binois R, Nadal M, Esteve E, De Muret A, Kerdraon R, Gheit T, Tommasino M, Gaboriaud P, Touze A, Samimi M. Cutaneous Kaposi sarcoma during treatment with superpotent topical steroids and methotrexate for bullous pemphigoid: three cases. Eur J Dermatol 2017; 27:369-374. [PMID: 28659250 DOI: 10.1684/ejd.2017.3027] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2024]
Abstract
Iatrogenic Kaposi sarcoma (KS) has previously been reported in patients with bullous pemphigoid (BP), in relation to systemic steroids. To report three cases of previously unreported cutaneous KS during treatment with superpotent topical steroids (STS) and methotrexate (MTX). All patients were elderly men with BP treated with STS for 2 to 32 months (cumulative doses: 2,700-9,150 g) before MTX was introduced (dosage: 10-12.5 mg/week). KS occurred one to nine months after the combined therapy. In one case, KS rapidly resolved after withdrawal of MTX. In two cases, vinblastine and/or radiotherapy were required to achieve regression of KS. Human herpes virus 8 (HHV8) latency-associated nuclear antigen was not expressed in BP lesions biopsied prior to development of KS (n = 3), but HHV8 DNA was detected in BP lesions from the patient with the most aggressive KS. Several predisposing factors were identified, including sex and age, high cumulative doses of STS, combination with MTX, and impaired immune status. In such cases, serum antibodies against HHV8 infection may be investigated in BP patients before introduction of MTX in order to guide clinical monitoring.
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Affiliation(s)
- Raphaëlle Binois
- University François Rabelais, Boulevard Tonnelé, 37044 Tours Cedex 9, France, Department of Dermatology, Hospital of Orléans, 1 rue Porte Madeleine, 45032 Orléans, France
| | - Marion Nadal
- University François Rabelais, Boulevard Tonnelé, 37044 Tours Cedex 9, France, Department of Dermatology, Hospital of Tours, Avenue de la République, 37044 Tours Cedex 9, France
| | - Eric Esteve
- Department of Dermatology, Hospital of Orléans, 1 rue Porte Madeleine, 45032 Orléans, France
| | - Anne De Muret
- Department of Pathology, Hospital of Tours, Avenue de la République, 37044 Tours Cedex 9, France
| | - Rémy Kerdraon
- Department of Pathology, Hospital of Orléans, 1 rue Porte Madeleine, 45032 Orléans, France
| | - Tarik Gheit
- International Agency for Research on Cancer, Infections and Cancer Biology Group, 150 Cours Albert Thomas, 69372 Lyon CEDEX 08, France
| | - Massimo Tommasino
- International Agency for Research on Cancer, Infections and Cancer Biology Group, 150 Cours Albert Thomas, 69372 Lyon CEDEX 08, France
| | - Pauline Gaboriaud
- Laboratory "Biologie des Infections à Polyomavirus", ISP 1282, INRA-University François, Rabelais, Tours, France
| | - Antoine Touze
- Laboratory "Biologie des Infections à Polyomavirus", ISP 1282, INRA-University François, Rabelais, Tours, France
| | - Mahtab Samimi
- University François Rabelais, Boulevard Tonnelé, 37044 Tours Cedex 9, France, Department of Dermatology, Hospital of Tours, Avenue de la République, 37044 Tours Cedex 9, France, Laboratory "Biologie des Infections à Polyomavirus", ISP 1282, INRA-University François, Rabelais, Tours, France
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Aleissa M, Konstantinou MP, Gaboriaud P, Touze A, Samimi M, Livideanu CB, Lamant L, Mazereeuw-hautier J, Paul C. Trichodysplasie spinulosique associée au VIH et à une déplétion lymphocytaire B. Ann Dermatol Venereol 2016. [DOI: 10.1016/j.annder.2016.09.502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Samimi M, Molet L, Fleury M, Laude H, Carlotti A, Gardair C, Baudin M, Gouguet L, Maubec E, Avenel-Audran M, Esteve E, Wierzbiecka Hainault E, Beneton N, Aubin F, Rozenberg F, Dupin N, Avril MF, Lorette G, Guyetant S, Coursaget P, Touze A. Valeur pronostique des anticorps anti-VP1 et anti-T du MCPyV dans une cohorte de patients avec carcinome de Merkel. Ann Dermatol Venereol 2015. [DOI: 10.1016/j.annder.2015.10.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bousarghin L, Touze A, Gaud G, Iochmann S, Alvarez E, Reverdiau P, Gaitan J, Jourdan ML, Sizaret PY, Coursaget PL. Inhibition of cervical cancer cell growth by human papillomavirus virus-like particles packaged with human papillomavirus oncoprotein short hairpin RNAs. Mol Cancer Ther 2009; 8:357-65. [PMID: 19174559 DOI: 10.1158/1535-7163.mct-08-0626] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Overexpression of human papillomavirus (HPV E6 and HPV E7) oncogenes in human cervical cells results in the development of cancer, and E6 and E7 proteins are therefore targets for preventing cervical cancer progression. Here, we describe the silencing of E6 and E7 expression in cervical carcinoma cells by RNA interference. In order to increase the efficacy of the RNA interference, HPV pseudovirions coding for a short hairpin RNA (shRNA) sequence were produced. The results indicated the degradation of E6 and E7 mRNAs when shRNA against E6 or E7 were delivered by pseudovirions in HPV-positive cells (CaSki and TC1 cells). E6 silencing resulted in the accumulation of cellular p53 and reduced cell viability. More significant cell death was observed when E7 expression was suppressed. Silencing E6 and E7 and the consequences for cancer cell growth were also investigated in vivo in mice using the capacity of murine TC1 cells expressing HPV-16 E6 and E7 oncogenes to induce fast-growing tumors. Treatment with lentiviruses and HPV virus-like particle vectors coding for an E7 shRNA sequence both resulted in dramatic inhibition of tumor growth. These results show the ability of pseudovirion-delivered shRNA to produce specific gene suppression and provide an effective means of reducing HPV-positive tumor growth.
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Le Guellec S, Montharu J, Renoux V, Vecellio L, Gaitan J, Bousarghin L, Touze A, Coates A, Diot P, Coursaget P. 086 Vaccination par voie inhalée contre le papillomavirus humain de type 16 chez la rate Sprague Dawley. Rev Mal Respir 2006. [DOI: 10.1016/s0761-8425(06)71914-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Touze A, Enogat N, Buisson Y, Coursaget P. Baculovirus expression of chimeric hepatitis B virus core particles with hepatitis E virus epitopes and their use in a hepatitis E immunoassay. J Clin Microbiol 1999; 37:438-41. [PMID: 9889237 PMCID: PMC84333 DOI: 10.1128/jcm.37.2.438-441.1999] [Citation(s) in RCA: 20] [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: 11/20/2022] Open
Abstract
Two hepatitis B core proteins bearing the immunodominant region of the hepatitis E virus (HEV) capsid protein, one at the C terminus of hepatitis B virus core antigen (HBcAg) and the other within the HBcAg immunodominant loop, were constructed. Both chimeric proteins exhibited HEV reactivity, but only the first construct retained HBcAg reactivity. The second construct was used to develop an anti-HEV test which is equivalent to a commercial test for the detection of anti-HEV immunoglobulin G (IgG) but is more sensitive for the detection of anti-HEV IgM.
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Affiliation(s)
- A Touze
- Institut de Virologie de Tours and Laboratoire des Processus Infectieux et Tumoraux, Faculté des Sciences Pharmaceutiques "Philippe Maupas," 37200 Tours, France
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Touze A, El Mehdaoui S, Sizaret PY, Mougin C, Muñoz N, Coursaget P. The L1 major capsid protein of human papillomavirus type 16 variants affects yield of virus-like particles produced in an insect cell expression system. J Clin Microbiol 1998; 36:2046-51. [PMID: 9650960 PMCID: PMC104976 DOI: 10.1128/jcm.36.7.2046-2051.1998] [Citation(s) in RCA: 67] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The L1 major capsid proteins of six human papillomavirus type 16 (HPV-16) strains were expressed in insect cells by using recombinant baculoviruses. Virus-like particles (VLPs) which appeared similar to empty virions were identified by electron microscopy for all HPV strains investigated. However, the yield of VLPs produced varied in a range from 1 to 79 depending on the HPV-16 strain. The L1 proteins of these strains differed by up to 15 amino acids from the L1 protein of the prototype HPV-16 strain. Mutations in the amino acid region from residues 83 to 97 seemed to affect the level of expression of the L1 protein. These results are important when considering the development of HPV vaccines and serological tests. They indicate that strains inducing high levels of VLP production must be selected for the development of vaccines. Moreover, the L1 proteins of all strains investigated were able to bind with DNA. We also investigated the seroreactivities of VLPs derived from three different HPV-16 strains from Algeria, Senegal, and the Philippines by testing sera from women from 11 countries in immunoglobulin G-specific enzyme-linked immunosorbent assays. We observed a strong correlation between the reactivities of the three different VLP variants, independent of the geographical origin of the sera investigated. These results indicate that the three strains investigated are serologically cross-reactive despite the fact that their L1 proteins differ in 14 amino acids and suggest that VLPs derived from only one HPV-16 strain could be sufficient for the development of an HPV-16 vaccine and anti-HPV-16 tests.
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Affiliation(s)
- A Touze
- Institut de Virologie de Tours and CJF INSERM 93/09 Immunologie des Maladies Infectieuses, UFR des Sciences Pharmaceutiques Philippe Maupas, Tours, France
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Abstract
Recombinant papillomavirus-like particles have recently been shown to be highly effective for the prevention of papillomavirus infections and associated tumors, and a virus-like particle-based vaccine against the most prevalent HPV causing genital infection in humans will be developed in the near future. Another use of these virus-like particles may lie in gene therapy and DNA immunization. We report here that human papillomavirus-like particles composed of the major capsid protein (L1) of HPV-16 are able to package unrelated plasmid DNA in vitro and then to deliver this foreign DNA to eukaryotic cells with the subsequent expression of the encoded gene. The results indicate higher gene transfer than with DNA alone or with liposome. Virus-like particles are a very promising vehicle for delivering genetic material into target cells. Moreover, the preparation of the gene transfer vehicle is relatively easy.
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Affiliation(s)
- A Touze
- Institut de Virologie de Tours and CJF INSERM d'Immunologie des Maladies Infectieuses, Faculté des Sciences Pharmaceutiques 'Philippe Maupas', 31 avenue Monge, 37200 Tours, France
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Abstract
Recombinant human papillomavirus (HPV) type 16 L1 virus-like particles (VLPs) expressed in the baculovirus system were used to investigate the cellular immune response to human papillomavirus type 16. The cell-mediated immune response was evaluated through immunization of mice with HPV 16 L1 virus-like particles using a lymphoproliferation assay and cytokine production and cytometric analysis of lymphocyte subsets. A significant proliferative response was observed which was associated with secretion of both interferon-gamma and interleukin-2. FACS analysis of splenic lymphocytes revealed that CD8+ T-cells were increased in the immunized mice. These results demonstrate that HPV 16 L1 VLPs induce a T-cell response characterized by a Th1 profile and confirm that the HPV 16 VLP is a reasonable candidate for vaccine development.
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Affiliation(s)
- C Dupuy
- Laboratoire d'Immunologie des Maladies Infectieuses, Faculté de Pharmacie, Tours, France
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Le Cann P, Touze A, Enogat N, Leboulleux D, Mougin C, Legrand MC, Calvet C, Afoutou JM, Coursaget P. Detection of antibodies against human papillomavirus (HPV) type 16 virions by enzyme-linked immunosorbent assay using recombinant HPV 16 L1 capsids produced by recombinant baculovirus. J Clin Microbiol 1995; 33:1380-2. [PMID: 7615761 PMCID: PMC228172 DOI: 10.1128/jcm.33.5.1380-1382.1995] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [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] Open
Abstract
The L1 major capsid protein of human papillomavirus type 16 (HPV-16) was expressed in Sf-21 insect cells with a recombinant baculovirus. Virus-like particles obtained were purified and used to develop an enzyme-linked immunosorbent assay for detection of anti-HPV-16 antibodies in sera from 76 women with evidence of genital HPV infection and 79 controls. HPV-16-infected individuals developed antibodies directed at HPV-16 virions since reactivity against recombinant HPV-16L1 capsids was observed in 50% of them compared with only 6% in the general adult population. However, some cross-reactivities with sera from women infected with others HPV types were observed.
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Affiliation(s)
- P Le Cann
- Service des Maladies Infectieuses, Hôpital de Fann, Dakar, Senegal
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Le Cann P, Coursaget P, Iochmann S, Touze A. Self-assembly of human papillomavirus type 16 capsids by expression of the L1 protein in insect cells. FEMS Microbiol Lett 1994; 117:269-74. [PMID: 8200503 DOI: 10.1111/j.1574-6968.1994.tb06778.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.4] [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: 01/29/2023] Open
Abstract
The L1 major protein of human papillomavirus type 16 was expressed in Sf-21 insect cells with a recombinant baculovirus vector. Virus-like particles similar in appearance to empty virions were identified by electron microscopy at densities of 1.29-1.30. Purified particles reacted with monoclonal anti-HPV-16-L1 antibody in Western blot and immuno dot blot suggesting that conformational epitopes are present in the recombinant particles. Immunodot blot assays using human sera correlated with the detection of HPV-16 DNA by the polymerase chain reaction. The results suggest that HPV-16-L1 virions produced by the baculovirus system might be useful for developing serologic tests to measure antibodies to conformational epitopes and may offer potential for vaccine development.
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Affiliation(s)
- P Le Cann
- Institut de Virologie de Tours, Faculté de Pharmacie, France
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Daugrois JH, Lafitte C, Barthe JP, Faucher C, Touze A, Esquerre-Tugaye MT. Purification and characterization of two basic beta-1,3-glucanases induced in Colletotrichum lindemuthianum-infected bean seedlings. Arch Biochem Biophys 1992; 292:468-74. [PMID: 1731612 DOI: 10.1016/0003-9861(92)90017-q] [Citation(s) in RCA: 5] [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: 12/28/2022]
Abstract
Two beta-1,3-glucanases which are rapidly induced in the incompatible interaction between bean (cv. Processor) and Colletotrichum lindemuthianum race beta were purified to homogeneity. Characterization of the two enzymes, GE1 and GE2, showed that they both had a basic isolectric point and a similar molecular weight (36,500 for GE1 and 36,000 for GE2), but differed in their pH optimum, thermal stability, and specific activity. GE2 was present in higher amounts but was shown to be less active than GE1 against laminarin and fungal cell walls isolated from race beta of the fungus. Both enzymes were specific for beta-1,3 linkages and showed a strict endolytic mode of action. Further characterization of GE2 was achieved by amino acid sequence analysis of tryptic peptides; the degree of homology shared with other basic beta-1,3-glucanases depended on the plant source. A time-course study showed that GE1 and GE2 were increased during infection. They were also induced by fungal elicitors, thereby indicating that they originate from the host.
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Affiliation(s)
- J H Daugrois
- Centre de Physiologie Végétale, Université Paul Sabatier, U. A. CNRS No. 241, Toulouse, France
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