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Fontes AC, Vieira MC, Oliveira M, Lourenço L, Viegas C, Faísca P, Seixas F, Requicha JF, Pires MA. Feline calicivirus and natural killer cells: A study of its relationship in chronic gingivostomatitis. Vet World 2023; 16:1708-1713. [PMID: 37766702 PMCID: PMC10521170 DOI: 10.14202/vetworld.2023.1708-1713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Accepted: 08/04/2023] [Indexed: 09/29/2023] Open
Abstract
Background and Aims Feline chronic gingivostomatitis (FCGS) is a frequent chronic inflammatory condition in the oral cavity with an etiopathogenesis not completely identified. This study aimed to contribute to the knowledge of FCGS by identifying the presence of feline calicivirus (FCV) antigens and natural killer (NK) cells and comparing them. Materials and Methods Forty biopsies from the oral mucosa of cats diagnosed with chronic gingivostomatitis were subjected to immunohistochemical techniques to evaluate cells with FCV antigens and NK cells positive for CD56. Results NK cells were identified in all samples, with an average of 725.3 ± 409.1 cells. Regarding FCV, it was identified in 18 out of 30 samples (60%), with a different number of cells with virus in between the analyzed cases. In all cases, the number of cells infected with FCV was lower than the number of NK cells present in the same samples, but there was no statistical association between them. Conclusion This preliminary study shows that NK cells are present in gingivostomatitis lesions not exclusively caused by FCV-stimulus, as only 60% of all cases were positive for this virus, but other antigens should be considered in the etiology of FCGS.
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Affiliation(s)
- Ana C. Fontes
- Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - Maria C. Vieira
- Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - Marcela Oliveira
- Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Campus Gualtar, 4710-057 Braga, Portugal
- ICVS/3B’s-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Lígia Lourenço
- Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
| | - Carlos Viegas
- Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
- Animal and Veterinary Research Centre (CECAV) and AL4AnimalS, UTAD, Vila Real, Portugal
| | - Pedro Faísca
- Faculty of Veterinary Medicine and Research Centre for Biosciences and Health Technologies, Lusófona University, Lisboa, Portugal
- DNAtech, Lisboa, Portugal
| | - Fernanda Seixas
- Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
- Animal and Veterinary Research Centre (CECAV) and AL4AnimalS, UTAD, Vila Real, Portugal
| | - João F. Requicha
- Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
- Animal and Veterinary Research Centre (CECAV) and AL4AnimalS, UTAD, Vila Real, Portugal
| | - Maria A. Pires
- Department of Veterinary Sciences, University of Trás-os-Montes and Alto Douro, Vila Real, Portugal
- Animal and Veterinary Research Centre (CECAV) and AL4AnimalS, UTAD, Vila Real, Portugal
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Cockey JR, Leifer CA. Racing CARs to veterinary immuno-oncology. Front Vet Sci 2023; 10:1130182. [PMID: 36876006 PMCID: PMC9982037 DOI: 10.3389/fvets.2023.1130182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Accepted: 01/31/2023] [Indexed: 02/19/2023] Open
Abstract
Chimeric antigen receptors (CARs) have demonstrated remarkable promise in human oncology over the past two decades, yet similar strategies in veterinary medicine are still in development. CARs are synthetically engineered proteins comprised of a specific antigen-binding single chain variable fragment (ScFv) fused to the signaling domain of a T cell receptor and co-receptors. Patient T cells engineered to express a CAR are directed to recognize and kill target cells, most commonly hematological malignancies. The U.S Food and Drug Administration (FDA) has approved multiple human CAR T therapies, but translation of these therapies into veterinary medicine faces many challenges. In this review, we discuss considerations for veterinary use including CAR design and cell carrier choice, and discuss the future promise of translating CAR therapy into veterinary oncology.
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Affiliation(s)
- James R Cockey
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Cynthia A Leifer
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
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Futas J, Oppelt J, Vychodilova L, Burger P, Horin P. The deadly face of felid killer cells: the cytotoxic proteins and their genes. HLA 2022; 100:37-51. [PMID: 35263044 DOI: 10.1111/tan.14595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 02/08/2022] [Accepted: 03/03/2022] [Indexed: 11/29/2022]
Abstract
Natural killer cells and cytotoxic T lymphocytes are the main cell populations of the immune system able to directly kill target cells via cytotoxic granules. Different mammalian species may differ in specific features of their pore-forming protein (perforin) and granule-bound serine proteases (granzymes). One perforin gene (PRF1) and four genes encoding granzymes A, B, H, and K (GZMA, GZMB, GZMH, GZMK) were identified in the reference genomes of felids. The objective of this work was to characterize the genes PRF1, GZMA and GZMB in a panel of 17 felid species by next-generation re-sequencing. A search of available felid genomes (17 species) retrieved the coding sequences of these genes for comparison to our data. Both sets of sequences or their combinations (23 species) were used for phylogenetic and selection analyses. Nucleotide PRF1, GZMA and GZMB sequences showed high similarities between felid species (over 95% identity). All trees derived from coding sequences expressed phylogenetic relationships corresponding to the zoological taxonomy of the Felidae, except GZMA. No effects of positive selection were detected in the genes studied, however, effects of purifying selection were observed for PRF1 and GZMA. The conservation of PRF1 is in agreement with its critical biological function. The differentiation observed between granzyme sub-families may reflect an adaptation to pathogen variation. The need to maintain important gene functions and at the same time cope with various pathogens may lead to an equilibrium between positive and negative selective pressures acting on GZMB. The within-species variability in wild felid populations merits further investigation. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Jan Futas
- Department of Animal Genetics, Faculty of Veterinary Medicine, University of Veterinary Sciences Brno (VETUNI), Brno, Czech Republic.,Research Group Animal Immunogenomics, CEITEC VETUNI, Brno, Czech Republic
| | - Jan Oppelt
- Research Group Animal Immunogenomics, CEITEC VETUNI, Brno, Czech Republic
| | - Leona Vychodilova
- Department of Animal Genetics, Faculty of Veterinary Medicine, University of Veterinary Sciences Brno (VETUNI), Brno, Czech Republic
| | - Pamela Burger
- Research Institute of Wildlife Ecology, University of Veterinary Medicine Vienna (VETMEDUNI), Vienna, Austria
| | - Petr Horin
- Department of Animal Genetics, Faculty of Veterinary Medicine, University of Veterinary Sciences Brno (VETUNI), Brno, Czech Republic.,Research Group Animal Immunogenomics, CEITEC VETUNI, Brno, Czech Republic
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Effects of Regulatory T Cell Depletion on NK Cell Responses against Listeria monocytogenes in Feline Immunodeficiency Virus Infected Cats. Viruses 2019; 11:v11110984. [PMID: 31653122 PMCID: PMC6893779 DOI: 10.3390/v11110984] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 10/20/2019] [Accepted: 10/21/2019] [Indexed: 01/19/2023] Open
Abstract
Regulatory T cells (Treg) are key players in the maintenance of peripheral tolerance, preventing autoimmune diseases and restraining chronic inflammatory diseases. Evidence suggests Treg cells and NK cells have important roles in feline immunodeficiency virus (FIV) pathogenesis; however, in vivo studies investigating the interplay between these two cell populations are lacking. We previously described innate immune defects in FIV-infected cats characterized by cytokine deficits and impaired natural killer cell (NK) and NK T cell (NKT) functions. In this study, we investigated whether in vivo Treg depletion by treatment with an anti-feline CD25 monoclonal antibody would improve the innate immune response against subcutaneous challenge with Listeria monocytogenes (Lm). Treg depletion resulted in an increased overall number of cells in Lm-draining lymph nodes and increased proliferation of NK and NKT cells in FIV-infected cats. Treg depletion did not normalize expression of perforin or granzyme A by NK and NKT cells, nor did Treg depletion result in improved clearance of Lm. Thus, despite the quantitative improvements in the NK and NKT cell responses to Lm, there was no functional improvement in the early control of Lm. CD1a+ dendritic cell percentages in the lymph nodes of FIV-infected cats were lower than in specific-pathogen-free control cats and failed to upregulate CD80 even when Treg were depleted. Taken together, Treg depletion failed to improve the innate immune response of FIV-infected cats against Lm and this may be due to dendritic cell dysfunction.
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Mucosal Immune Response to Feline Enteric Coronavirus Infection. Viruses 2019; 11:v11100906. [PMID: 31569783 PMCID: PMC6832150 DOI: 10.3390/v11100906] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 09/22/2019] [Accepted: 09/23/2019] [Indexed: 12/31/2022] Open
Abstract
Feline infectious peritonitis is a devastating, fatal disease of domestic cats caused by a pathogenic mutant virus derived from the ubiquitous feline enteric coronavirus (FECV). Infection by FECV is generally subclinical, and little is known about the mucosal immune response that controls and eliminates the virus. We investigated the mucosal immune response against FECV in an endemically infected breeding colony over a seven-month period. Thirty-three cats were grouped according to FECV seropositivity and fecal virus shedding into naïve/immunologically quiescent, convalescent and actively infected groups. Blood, fecal samples and colon biopsies were collected to assess the mucosal and systemic immunologic and virologic profile. Results showed that cats with active FECV infections have strong systemic IgG and mucosal IgA responses that wane after virus clearance. Significant FECV-specific mucosal T cell IFNγ responses were not detected in any of the three groups. A shift toward an inflammatory state in the mucosa was suggested by increased IL17:FoxP3 expression. However, no histologic abnormalities were observed, and no shifts in lymphocyte subpopulation phenotype or proliferation were noted. Together, the results suggest that control of FECV is mediated by humoral mucosal and systemic responses and that perturbations in the primary reservoir organ (colon) are minimal.
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Phenotypic and functional analysis of CD1a+ dendritic cells from cats chronically infected with feline immunodeficiency virus. Comp Immunol Microbiol Infect Dis 2015; 42:53-9. [PMID: 26385493 DOI: 10.1016/j.cimid.2015.07.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 07/29/2015] [Indexed: 11/22/2022]
Abstract
Numerous studies suggest dendritic cell (DC) dysfunction is central to the dysregulated immune response during HIV infection; however, in vivo studies are lacking. In the present study we used feline immunodeficiency virus (FIV) infection of cats as a model for HIV-1 infection to assess the maturation and function of dendritic cells, in vivo and in vitro. We compared CD1a+ DC migration, surface phenotype, endocytosis, mixed leukocyte reaction (MLR) and regulatory T cell (Treg) phenotype induction by CD1a+ cells isolated from lymph nodes of FIV-infected and control cats. Results showed that resident CD1a+ DC in lymph nodes of chronically FIV-infected cats are phenotypically mature, can stimulate normal primary T cell proliferation, override Treg suppression and do not skew toward Treg induction. In contrast, FIV infection had deleterious effects on antigen presentation and migratory capacity of CD1a+ cells in tissues.
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Large granular lymphocytes are universally increased in human, macaque, and feline lentiviral infection. Vet Immunol Immunopathol 2015; 167:110-21. [PMID: 26292765 DOI: 10.1016/j.vetimm.2015.07.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Revised: 07/01/2015] [Accepted: 07/21/2015] [Indexed: 02/07/2023]
Abstract
Large granular lymphocytes (LGLs) have only been anecdotally reported in HIV infection. We previously reported an LGL lymphocytosis in FIV-infected cats associated with a rise in FIV proviral loads and a marked neutropenia that persisted during chronic infection. Extensive immunophenotyping of peripheral blood mononuclear cells in cats chronically infected with FIV were identified LGLs as CD8lo(+)FAS(+); this cell population expanded commensurate with viral load. CD8lo(+)FAS(+) cells expressed similar levels of interferon-γ compared to CD8lo(+)FAS(+) cells from FIV-naive control animals, yet CD3ɛ expression, which was increased on total CD8(+) T cells in FIV-infected cats, was decreased on CD8lo(+)FAS(+) cells. Down-modulation of CD3 expression was reversed after culturing PBMC for 3 days in culture with ConA/IL-2. We identified CD8lo(+)FAS(+) LGLs to be polyclonal T cells lacking CD56 expression. Blood smears from HIV-infected individuals and SIVmac239-infected rhesus macaques revealed increased LGLs compared to HIV/SIV negative counterparts. In humans, there was no correlation with viral load or treatment and in macaques the LGLs arose in acute SIV infection with increases in viremia. This is the first report describing and partially characterizing LGL lymphocytosis in association with lentiviral infections in three different species.
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Abstract
The feline immunodeficiency virus (FIV) shares genomic organization, receptor usage, lymphocyte tropism, and induction of immunodeficiency and increased susceptibility to cancer with the human immunodeficiency virus (HIV). Global distribution, marked heterogeneity and variable host adaptation are also properties of both viruses. These features render the FIV-cat model suitable to explore many aspects of lentivirus-host interaction and adaptation, and to explore treatment and prevention of infection. Examples of fundamental discoveries that have emerged from study in the FIV-cat model concern two-receptor entrance strategies that target memory T-lymphocytes, host factors that restrict retroviral infection, viral strategies for replication in non-dividing cells, and identification of correlates of immunity to the virus. This article provides a brief overview of strengths and limitations of the FIV-cat model for comparative biology and medicine.
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Affiliation(s)
- Dorothee Bienzle
- Department of Pathobiology, University of Guelph, Guelph, ON, Canada.
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