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Banovic F. Updated insights into the molecular pathogenesis of canine atopic dermatitis. Vet Dermatol 2024. [PMID: 39323043 DOI: 10.1111/vde.13300] [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: 05/16/2024] [Revised: 08/08/2024] [Accepted: 09/12/2024] [Indexed: 09/27/2024]
Abstract
Atopic dermatitis (AD) is a common and chronic inflammatory skin disease with frequent relapses. The genomics revolution has greatly contributed and revolutionised our knowledge of human AD; understanding the molecular skin fingerprint of AD and associated pathogenic immune pathways has led to preclinical assessments of several novel treatments. Initial studies using microarray analysis to analyse transcriptome (gene expression) changes provided relevant insight on the inflammatory and structural changes occurring at the time of acute or chronic AD skin lesions, or after immunomodulating treatments with drugs ciclosporin and dupilumab, a monoclonal antibody anti-IL4 receptor. The studies revealed that human AD is characterised by the activation of multiple cytokine pathways (predominance of T helper cell [Th]2 with some activation of Th1, Th17 and Th22) as well as dysregulated expression of barrier components in the skin. There are several reports on the expression of different single molecular targets (e.g. interleukin [IL]-13, CCL17 and periostin) in spontaneous canine AD (cAD). However, significant studies of the transcriptome have been limited to a single microarray study analysing chronic AD skin lesions in dogs. While revealing a large number of genes differentially expressed in cAD skin, the small sample size (n = 13 dogs) and the lack of changes in key epidermal barrier and inflammatory cytokine genes in the microarrays have inhibited discussion towards specific immunological changes. This review summarises the current literature regarding the molecular mechanisms of spontaneous cAD, including the recent data regarding RNA sequencing, and compares some pathogenic aspects to the previously published data from human AD.
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Affiliation(s)
- Frane Banovic
- Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA
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van Amersfort K, van der Lee A, Hagen-Plantinga E. Evidence-base for the beneficial effect of nutraceuticals in canine dermatological immune-mediated inflammatory diseases - A literature review. Vet Dermatol 2023. [PMID: 36938651 DOI: 10.1111/vde.13152] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 11/01/2022] [Accepted: 11/26/2022] [Indexed: 03/21/2023]
Abstract
BACKGROUND Immune-mediated inflammatory diseases (IMIDs) are associated with an abnormal immune response, resulting in a disturbed homeostasis and chronic inflammation. Most canine dermatological IMIDs (cDIMIDs), such as allergies, autoimmune and immune-mediated diseases, require long-term treatment with immunosuppressive drugs with potential adverse effects. In general, nutraceuticals are thought to be safe. As a result, there is a tendency for the more frequent use of nutraceuticals in veterinary medicine. OBJECTIVES The aim of this review was to present evidence-based proof for the use of various nutraceuticals in the treatment of cDIMIDs and, where possible, to provide conclusions to guide their use in veterinary dermatological practice. METHODS A comprehensive literature search on common cDIMIDs and nutraceuticals was performed. Only peer-reviewed articles published in English and related to the study topic were included. A total of 64 eligible publications were classified in five categories based on study design and substantively assessed on additional criteria such as standardisation of diets and number of included animals. For final appraisal, classification of major, minor or no evidence was used whereby efficacy was based on clinical outcome measurements. CONCLUSIONS Minor evidence for the beneficial use of several nutraceuticals, including essential fatty acids, niacinamide and probiotics, was found for treatment of specific cDIMIDs. These nutraceuticals may improve clinical signs or reduce the required dose of concurrent medication (e.g. drug-sparing effect) in some dogs. Some nutraceuticals also may be used for long-term maintenance therapy. Despite some promising findings, major evidence for the use of nutraceuticals in cDIMIDs is lacking, warranting further research.
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Kanwal S, Singh SK, Soman SP, Choudhury S, Kumari P, Ram PK, Garg SK. Expression of barrier proteins in the skin lesions and inflammatory cytokines in peripheral blood mononuclear cells of atopic dogs. Sci Rep 2021; 11:11418. [PMID: 34075152 PMCID: PMC8169657 DOI: 10.1038/s41598-021-90992-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Accepted: 05/19/2021] [Indexed: 01/31/2023] Open
Abstract
Atopic dermatitis (AD) is one of the most common skin diseases of dogs. Defects in the skin barrier and overproduction of inflammatory cytokines may be the pathogenesis of canine AD. Therefore, the present study was aimed to quantify the gene expression of certain skin barrier proteins and inflammatory cytokines in dogs with AD. Eleven dogs with AD and three healthy dogs were included in the present study. The skin barrier proteins, namely Filaggrin (FLG) and Involucrin (IVL), gene expression was quantified by Real-time PCR in the lesional skin tissues of the atopic dogs and normal skin of the healthy dogs. In addition to the skin proteins, the gene expressions of the interleukin (IL)-13, IL-31, and tumour necrosis factor (TNF)-α were also quantified in the peripheral blood mononuclear cells (PBMCs) of these dogs. Compared to the healthy dogs, significantly higher (P ≤ 0.01) FLG gene expression and significantly (P ≤ 0.05) lower expression of the IVL gene were quantified in the skin of atopic dogs. Further, the dogs with AD revealed significantly higher expression of TNF-α (P ≤ 0.01), IL-31 (P ≤ 0.05), and IL-13 (P ≤ 0.05) as compared to the healthy dogs. The findings of our present study evidently suggest significantly increased and decreased expressions of FLG and IVL genes, respectively, which may be responsible for disruption of the skin barrier in dogs with AD. While, the over-expressions of TNF-α, IL-31, and IL-13 genes might be attributed to the clinical pathology and manifestations of AD in dogs. However, further studies are warranted to substantiate our hypothesis about pathogenesis and clinical manifestation of AD in dogs by including a large number of animals.
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Affiliation(s)
- Sarita Kanwal
- Department of Veterinary Medicine, College of Veterinary Science and Animal Husbandry, Uttar Pradesh Pandit Deen Dayal Upadhyaya Pashu-Chikitsa Vigyan Vishwavidyalaya Evam Go Anusandhan Sanstahan (DUVASU), Mathura, U.P., 281 001, India
| | - Shanker K Singh
- Department of Veterinary Medicine, College of Veterinary Science and Animal Husbandry, Uttar Pradesh Pandit Deen Dayal Upadhyaya Pashu-Chikitsa Vigyan Vishwavidyalaya Evam Go Anusandhan Sanstahan (DUVASU), Mathura, U.P., 281 001, India.
| | - Sandeep P Soman
- Department of Veterinary Medicine, College of Veterinary Science and Animal Husbandry, Uttar Pradesh Pandit Deen Dayal Upadhyaya Pashu-Chikitsa Vigyan Vishwavidyalaya Evam Go Anusandhan Sanstahan (DUVASU), Mathura, U.P., 281 001, India
| | - Soumen Choudhury
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science and Animal Husbandry, Uttar Pradesh Pandit Deen Dayal Upadhyaya Pashu-Chikitsa Vigyan Vishwavidyalaya Evam Go Anusandhan Sanstahan (DUVASU), Mathura, U.P., 281 001, India
| | - Priyambada Kumari
- College of Biotechnology, Uttar Pradesh Pandit Deen Dayal Upadhyaya Pashu-Chikitsa Vigyan Vishwavidyalaya Evam Go Anusandhan Sanstahan (DUVASU), Mathura, U.P., 281 001, India
| | - Pradeep K Ram
- Department of Veterinary Medicine, College of Veterinary Science and Animal Husbandry, Uttar Pradesh Pandit Deen Dayal Upadhyaya Pashu-Chikitsa Vigyan Vishwavidyalaya Evam Go Anusandhan Sanstahan (DUVASU), Mathura, U.P., 281 001, India
| | - Satish K Garg
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science and Animal Husbandry, Uttar Pradesh Pandit Deen Dayal Upadhyaya Pashu-Chikitsa Vigyan Vishwavidyalaya Evam Go Anusandhan Sanstahan (DUVASU), Mathura, U.P., 281 001, India
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Abstract
Human filaggrin (FLG) plays a key role in epidermal barrier function, and loss-of-function mutations of its gene are primarily responsible for the development of human atopic dermatitis (AD). FLG expression is also reduced in the epidermis of atopic patients, due to the transcriptional effect of Th2 type cytokines. Canine atopic dermatitis (CAD) is a prevalent skin disease that shares many clinical and pathogenic features with its human homologue. The aim of this review is discuss current knowledge on canine filaggrin (Flg) in both healthy and atopic dogs, as compared to the human protein. Although the molecular structures of the two proteins, as deduced from the sequences of their gene, are different, their sites of expression and their proteolytic processing in the normal epidermis are similar. Concerning the expression of Flg in CAD, conflicting results have been published at the mRNA level and little accurate information is available at the protein level. It derives from a large precursor, named profilaggrin (proFLG), formed by several FLG units and stored in keratohyalin granules of the stratum granulosum. Canine and human proFLG sequences display little amino acid similarity (33% as shown using the Basic Local Alignment Search Tool (BLAST)) except at the level of the S100 homologous part of the N-terminus (75%). Genetic studies in the dog are at an early stage and are limited by the variety of breeds and the small number of cases included. Many questions remain unanswered about the involvement of Flg in CAD pathogenesis.
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Affiliation(s)
- Daniel Combarros
- UDEAR, Université de Toulouse, INSERM UPS, Toulouse, France.,Université de Toulouse, ENVT, Toulouse, France
| | - Marie-Christine Cadiergues
- UDEAR, Université de Toulouse, INSERM UPS, Toulouse, France.,Université de Toulouse, ENVT, Toulouse, France
| | - Michel Simon
- UDEAR, Université de Toulouse, INSERM UPS, Toulouse, France
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Anturaniemi J, Zaldívar-López S, Savelkoul HFJ, Elo K, Hielm-Björkman A. The Effect of Atopic Dermatitis and Diet on the Skin Transcriptome in Staffordshire Bull Terriers. Front Vet Sci 2020; 7:552251. [PMID: 33178726 PMCID: PMC7596200 DOI: 10.3389/fvets.2020.552251] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 09/08/2020] [Indexed: 12/22/2022] Open
Abstract
Canine atopic dermatitis (CAD) has a hereditary basis that is modified by interactions with the environment, including diet. Differentially expressed genes in non-lesional skin, determined by RNA sequencing before and after a dietary intervention, were compared between dogs with naturally occurring CAD (n = 4) and healthy dogs (n = 4). The dogs were fed either a common commercial heat-processed high carbohydrate food (kibble diet) (n = 4), or a non-processed high fat food (raw meat-based diet) (n = 4). At the end of the diet intervention, 149 differentially expressed transcripts were found between the atopic and healthy dogs. The main canonical pathways altered by the dysregulation of these genes were angiopoietin signaling, epidermal growth factor signaling, activation of angiogenesis, and alterations in keratinocyte proliferation and lipid metabolism. On the other hand, 33 differently expressed transcripts were found between the two diet groups, of which 8 encode genes that are annotated in the current version of the dog genome: immunoglobulin heavy constant mu (IGHM), immunoglobulin lambda-like polypeptide 5 (IGLL5), B-cell antigen receptor complex-associated protein beta chain (CD79B), polymeric immunoglobulin receptor (PIGR), cystathionine β-synthase (CBS), argininosuccinate synthase 1 (ASS1), secretory leukocyte peptidase inhibitor (SLPI), and mitochondrial ribosome recycling factor (MRRF). All genes were upregulated in the raw diet group. In conclusion the findings of this study suggest alterations in lipid and keratinocyte metabolism as well as angiogenesis in the skin of atopic dogs. Additionally, a possible enhancement of innate immunity and decrease in oxidative stress was seen in raw food fed dogs, which could have an important role in preventing hypersensitivities and disturbed immunity at young age.
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Affiliation(s)
- Johanna Anturaniemi
- Faculty of Veterinary Medicine, Department of Equine and Small Animal Medicine, University of Helsinki, Helsinki, Finland
| | - Sara Zaldívar-López
- Genomics and Animal Breeding Group, Department of Genetics, Faculty of Veterinary Medicine, University of Córdoba, Córdoba, Spain
| | - Huub F J Savelkoul
- Cell Biology and Immunology Group, Wageningen University, Wageningen, Netherlands
| | - Kari Elo
- Faculty of Agriculture and Forestry, Department of Agricultural Sciences, University of Helsinki, Helsinki, Finland
| | - Anna Hielm-Björkman
- Faculty of Veterinary Medicine, Department of Equine and Small Animal Medicine, University of Helsinki, Helsinki, Finland
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Eisenschenk M. Phenotypes of Canine Atopic Dermatitis. CURRENT DERMATOLOGY REPORTS 2020. [DOI: 10.1007/s13671-020-00303-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Marsella R, Papastavros V, Ahrens K, Santoro D. Decreased expression of caspase-14 in an experimental model of canine atopic dermatitis. Vet J 2015; 209:201-3. [PMID: 26831171 DOI: 10.1016/j.tvjl.2015.11.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 11/19/2015] [Accepted: 11/29/2015] [Indexed: 11/30/2022]
Abstract
Alterations in skin barrier function and filaggrin expression have been reported in atopic dermatitis (AD). Caspase-14, a protease important for filaggrin processing, is decreased in human AD. Atopic Beagle dogs with skin barrier alterations have been validated as model for AD. This study aimed to investigate caspase-14 in normal and atopic Beagle dogs. Skin biopsies from non-lesional and control skin were analyzed for caspase-14 by immunofluorescence. Six images/sections were blindly scored for intensity. Data were tested with unpaired Student's t test. A P value of <0.05 was considered significant. Caspase-14 was decreased in atopic compared to normal skin both quantitatively (P <0.001) and qualitatively (P = 0.006; agreement = 0.93; consistency = 0.94). In conclusion, caspase-14 is decreased in this model similarly to reports in humans, highlighting the relevance of filaggrin metabolic defects in AD.
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Affiliation(s)
- Rosanna Marsella
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, 2015 SW 16th Avenue, Gainesville, FL 32608, USA; Department of Dermatology, Springhill UF Health, College of Medicine, University of Florida, 4037 NW 86th Terrace, Gainesville, FL 32606, USA.
| | - Vassi Papastavros
- Department of Dermatology, Springhill UF Health, College of Medicine, University of Florida, 4037 NW 86th Terrace, Gainesville, FL 32606, USA
| | - Kim Ahrens
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, 2015 SW 16th Avenue, Gainesville, FL 32608, USA
| | - Domenico Santoro
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Florida, 2015 SW 16th Avenue, Gainesville, FL 32608, USA
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Santoro D, Marsella R, Pucheu-Haston CM, Eisenschenk MNC, Nuttall T, Bizikova P. Review: Pathogenesis of canine atopic dermatitis: skin barrier and host-micro-organism interaction. Vet Dermatol 2015; 26:84-e25. [DOI: 10.1111/vde.12197] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/18/2014] [Indexed: 01/19/2023]
Affiliation(s)
- Domenico Santoro
- Department of Small Animal Clinical Sciences; College of Veterinary Medicine; University of Florida; 2015 SW 16th Avenue Gainesville FL 32610 USA
| | - Rosanna Marsella
- Department of Small Animal Clinical Sciences; College of Veterinary Medicine; University of Florida; 2015 SW 16th Avenue Gainesville FL 32610 USA
| | - Cherie M. Pucheu-Haston
- Department of Veterinary Clinical Sciences; School of Veterinary Medicine; Louisiana State University; 1909 Skip Bertman Drive Baton Rouge LA 70803 USA
| | | | - Tim Nuttall
- Royal (Dick) School of Veterinary Studies; Easter Bush Veterinary Centre; University of Edinburgh; Roslin EH25 9RG UK
| | - Petra Bizikova
- Department of Clinical Sciences; College of Veterinary Medicine; North Carolina State University; 1060 William Moore Drive Raleigh NC 27606 USA
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Santoro D, Marsella R, Ahrens K, Graves TK, Bunick D. Altered mRNA and protein expression of filaggrin in the skin of a canine animal model for atopic dermatitis. Vet Dermatol 2013; 24:329-36, e73. [DOI: 10.1111/vde.12031] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/16/2013] [Indexed: 12/20/2022]
Affiliation(s)
- Domenico Santoro
- Department of Veterinary Clinical Medicine; University of Illinois at Urbana-Champaign; 1008 W Hazelwood Drive; Urbana; IL; 61802; USA
| | - Rosanna Marsella
- Department of Small Animal Clinical Sciences; University of Florida; 2015 SW 16th Avenue; Gainesville; FL 32615; USA
| | - Kim Ahrens
- Department of Small Animal Clinical Sciences; University of Florida; 2015 SW 16th Avenue; Gainesville; FL 32615; USA
| | - Thomas K. Graves
- Department of Veterinary Clinical Medicine; University of Illinois at Urbana-Champaign; 1008 W Hazelwood Drive; Urbana; IL; 61802; USA
| | - David Bunick
- Department of Veterinary Biosciences; University of Illinois at Urbana-Champaign; 2001 South Lincoln Avenue; Urbana; IL 60802; USA
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