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Lean FZX, Payne J, Harper J, Devlin J, Williams DT, Bingham J. Evaluation of Bluetongue Virus (BTV) Antibodies for the Immunohistochemical Detection of BTV and Other Orbiviruses. Microorganisms 2020; 8:microorganisms8081207. [PMID: 32784809 PMCID: PMC7464351 DOI: 10.3390/microorganisms8081207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 08/04/2020] [Accepted: 08/05/2020] [Indexed: 12/04/2022] Open
Abstract
The detection of bluetongue virus (BTV) antigens in formalin-fixed tissues has been challenging; therefore, only a limited number of studies on suitable immunohistochemical approaches have been reported. This study details the successful application of antibodies for the immunohistochemical detection of BTV in BSR variant baby hamster kidney cells (BHK-BSR) and infected sheep lungs that were formalin-fixed and paraffin-embedded (FFPE). BTV reactive antibodies raised against non-structural (NS) proteins 1, 2, and 3/3a and viral structural protein 7 (VP7) were first evaluated on FFPE BTV-infected cell pellets for their ability to detect BTV serotype 1 (BTV-1). Antibodies that were successful in immunolabelling BTV-1 infected cell pellets were further tested, using similar methods, to determine their broader immunoreactivity against a diverse range of BTV and other orbiviruses. Antibodies specific for NS1, NS2, and NS3/3a were able to detect all BTV isolates tested, and the VP7 antibody cross-reacted with all BTV isolates, except BTV-15. The NS1 antibodies were BTV serogroup-specific, while the NS2, NS3/3a, and VP7 antibodies demonstrated immunologic cross-reactivity to related orbiviruses. These antibodies also detected viral antigens in BTV-3 infected sheep lung. This study demonstrates the utility of FFPE-infected cell pellets for the development and validation of BTV immunohistochemistry.
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Affiliation(s)
- Fabian Z. X. Lean
- CSIRO Australian Centre for Disease Preparedness (ACDP, formerly AAHL), Geelong 3220, Victoria, Australia; (J.P.); (J.H.); (D.T.W.)
- Department of Veterinary Biosciences, Faculty of Veterinary and Agricultural Sciences, the University of Melbourne, Parkville 3052, Victoria, Australia;
- Pathology Department, Animal and Plant Health Agency (APHA), New Haw, Addlestone KT15 3NB, UK
- Correspondence: (F.Z.X.L.); (J.B.)
| | - Jean Payne
- CSIRO Australian Centre for Disease Preparedness (ACDP, formerly AAHL), Geelong 3220, Victoria, Australia; (J.P.); (J.H.); (D.T.W.)
| | - Jennifer Harper
- CSIRO Australian Centre for Disease Preparedness (ACDP, formerly AAHL), Geelong 3220, Victoria, Australia; (J.P.); (J.H.); (D.T.W.)
| | - Joanne Devlin
- Department of Veterinary Biosciences, Faculty of Veterinary and Agricultural Sciences, the University of Melbourne, Parkville 3052, Victoria, Australia;
| | - David T. Williams
- CSIRO Australian Centre for Disease Preparedness (ACDP, formerly AAHL), Geelong 3220, Victoria, Australia; (J.P.); (J.H.); (D.T.W.)
| | - John Bingham
- CSIRO Australian Centre for Disease Preparedness (ACDP, formerly AAHL), Geelong 3220, Victoria, Australia; (J.P.); (J.H.); (D.T.W.)
- Correspondence: (F.Z.X.L.); (J.B.)
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