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Yazlık MO, Müştak İB, Özkan H, Vural SA, Kaya U, Özöner Ö, Mutluer İ, Altınbaş YF, Soylu MS, Vural MR. The presence of virulence factor genes downregulates uterine AQP3 and alters glutathione peroxidase activity and uterine histopathology in canine pyometra. Reprod Domest Anim 2024; 59:e14615. [PMID: 38798181 DOI: 10.1111/rda.14615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 04/30/2024] [Accepted: 05/09/2024] [Indexed: 05/29/2024]
Abstract
Present study was designed to evaluate the role of virulence factor genes (papG, cnf1 and hylA) in the pathogenesis of canine pyometra. Antimicrobial susceptibility test and detection of virulence genes were performed Escherichia coli (E. coli) detected in uterine swab samples. Animals were divided into two groups based on the presence (VF+, n:14) or absence (VF-, n:7) of the virulence factor genes papG, cnf1 and hylA. Blood and tissue glutathione peroxidase activity, uterine histopathologic analysis and AQP3, ESR1, PGR, OXTR gene expressions were determined in both groups. Statistical analyses were performed using Stata version 15.1. All E. coli isolates were susceptible to amikacin, whereas resistant to ampicillin, amoxicillin/clavulanic acid and lincomycin. None of the isolates were susceptible to cefotaxime. E. coli isolates had at least one virulence gene. The most prevalent gene was fimH (100%), followed by fyuA (95.8%), usp (83.3%), sfa (75%), cnf1 and hlyA (70.8%) genes. Blood GPx activity was greater in VF+ animals. On the other hand, uterine tissue GPx activity was lower in VF+ group compared to the control group. Expression levels of AQP3 were upregulated more than fivefold in VF-dogs compared to the control group. In addition, AQP3 expression levels were found approximately threefold higher in VF (-) than VF (+) group (p < .05). Varying degree of inflammation noted for all animals with pyometra, but the presence of bacteria noted only in VF+ animals. In conclusion, the presence of virulence factor genes does not play a role in the histopathological degree of inflammation, the presence of bacteria was found to vary. Serum GPx activity increased in VF+ animals. While the hormone receptor expressions were similar, AQP expression was upregulated in the absence of virulence factor genes.
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Affiliation(s)
- Murat Onur Yazlık
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
| | - İnci Başak Müştak
- Department of Microbiology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
| | - Hüseyin Özkan
- Department of Genetics, Faculty of Veterinary Medicine, Hatay Mustafa Kemal University, Hatay, Turkey
| | - Sevil Atalay Vural
- Department of Pathology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
| | - Ufuk Kaya
- Department of Biostatistics, Faculty of Veterinary Medicine, Hatay Mustafa Kemal University, Hatay, Turkey
| | - Özgür Özöner
- Department of Pathology, Faculty of Veterinary Medicine, Siirt University, Siirt, Turkey
| | - İpek Mutluer
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
- Ankara University Graduate School of Health Sciences, Ankara, Turkey
| | - Yunus Furkan Altınbaş
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
- Ankara University Graduate School of Health Sciences, Ankara, Turkey
| | - Miray Sevde Soylu
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
- Ankara University Graduate School of Health Sciences, Ankara, Turkey
| | - Mehmet Rıfat Vural
- Department of Obstetrics and Gynecology, Faculty of Veterinary Medicine, Ankara University, Ankara, Turkey
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Xavier RGC, Santana CH, da Silva PHS, Paraguassú AO, Nicolino RR, Freitas PMC, Santos RDL, Silva ROS. Association between bacterial pathogenicity, endometrial histological changes and clinical prognosis in canine pyometra. Theriogenology 2024; 214:118-123. [PMID: 37865019 DOI: 10.1016/j.theriogenology.2023.10.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 08/29/2023] [Accepted: 10/07/2023] [Indexed: 10/23/2023]
Abstract
Despite the high frequency and clinical relevance of canine pyometra, its pathogenesis remains poorly understood. In this study, the clinical data, histopathological alterations, and microbiological findings of 39 dogs with pyometra were analyzed to assess possible associations. The mean age of the affected animals was 9.6 ± 3.8 years; 76.3 % (29/38) had open cervix pyometra, 88 % (22/25) had tachypnea, 71 % (27/38) had anorexia, and 60.5 % (23/38) had leukocytosis. Histopathological analysis revealed that 66.5 % (26/39) of the uteri had a high degree of inflammation (score 4). Third-degree hyperplasia of the endometrial epithelium (72 %, 28/39) and intralesional or intrauterine bacteria (66.5 %, 26/39) were identified in most animals. Bacterial isolates were obtained from 82 % (32/39) of the uterine contents and five bacterial species were identified. Escherichia coli, classified in phylogroup B2, is associated with virulent adhesion genes (fimH, focG, and papC), and serum resistance (traT) was the most common isolate. There was an association between the detection of papC in E. coli isolates and higher necrosis scores. Additionally, the necrosis score was positively associated with the length of hospitalization, with each point increase in the necrosis score leading to two more days of hospitalization. These results suggest that papC-positive E. coli play an important role in the severity of pyometra in dogs. The present study revealed the possibility of using this virulence gene to better understand the prognosis of the disease in an affected animal.
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Affiliation(s)
- Rafael Gariglio Clark Xavier
- Escola de Veterinária, Universidade Federal de Minas Gerais, Antônio Carlos Avenue, 6627, Belo Horizonte, MG, 31.270-901, Brazil
| | - Clarissa Helena Santana
- Escola de Veterinária, Universidade Federal de Minas Gerais, Antônio Carlos Avenue, 6627, Belo Horizonte, MG, 31.270-901, Brazil
| | - Paloma Helena Sanches da Silva
- Escola de Veterinária, Universidade Federal de Minas Gerais, Antônio Carlos Avenue, 6627, Belo Horizonte, MG, 31.270-901, Brazil
| | - Amanda Oliveira Paraguassú
- Escola de Veterinária, Universidade Federal de Minas Gerais, Antônio Carlos Avenue, 6627, Belo Horizonte, MG, 31.270-901, Brazil
| | - Rafael Romero Nicolino
- Escola de Veterinária, Universidade Federal de Minas Gerais, Antônio Carlos Avenue, 6627, Belo Horizonte, MG, 31.270-901, Brazil
| | - Patrícia Maria Coletto Freitas
- Escola de Veterinária, Universidade Federal de Minas Gerais, Antônio Carlos Avenue, 6627, Belo Horizonte, MG, 31.270-901, Brazil
| | - Renato de Lima Santos
- Escola de Veterinária, Universidade Federal de Minas Gerais, Antônio Carlos Avenue, 6627, Belo Horizonte, MG, 31.270-901, Brazil
| | - Rodrigo Otávio Silveira Silva
- Escola de Veterinária, Universidade Federal de Minas Gerais, Antônio Carlos Avenue, 6627, Belo Horizonte, MG, 31.270-901, Brazil.
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Xavier RGC, Santana CH, de Castro YG, de Souza TGV, do Amarante VS, Santos RL, Silva ROS. Canine Pyometra: A Short Review of Current Advances. Animals (Basel) 2023; 13:3310. [PMID: 37958065 PMCID: PMC10647846 DOI: 10.3390/ani13213310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 10/13/2023] [Accepted: 10/24/2023] [Indexed: 11/15/2023] Open
Abstract
Pyometra, characterized by the accumulation of purulent exudate in the uterus, is the most prevalent reproductive disease in canines. While the disease often begins with mild local symptoms, it can escalate into peritonitis, sepsis, and multi-organ dysfunction, thereby posing a significant threat to life. Despite the high incidence and recognized significance of canine pyometra, gaps persist in our understanding of its epidemiology, etiology, and pathogenesis. Recent studies have, however, broadened our comprehension of this disease, shedding light on potential new infection sources, etiologies, and the application of clinical predictive biomarkers and new therapeutic protocols. This study aimed to review the current understanding of canine pyometra, with particular emphasis on the latest research concerning its etiology and epidemiology. Furthermore, it addressed key research questions and proposed directions for future investigations into various facets of canine pyometra.
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Xavier RGC, da Silva PHS, Trindade HD, Carvalho GM, Nicolino RR, Freitas PMC, Silva ROS. Characterization of Escherichia coli in Dogs with Pyometra and the Influence of Diet on the Intestinal Colonization of Extraintestinal Pathogenic E. coli (ExPEC). Vet Sci 2022; 9:vetsci9050245. [PMID: 35622773 PMCID: PMC9144190 DOI: 10.3390/vetsci9050245] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 05/06/2022] [Accepted: 05/09/2022] [Indexed: 02/04/2023] Open
Abstract
Despite its high frequency and clinical relevance, the pathogenesis of canine pyometra remains poorly understood. The most accepted hypothesis is that bacteria involved ascend from the intestinal tract, causing the uterine infection. Extraintestinal pathogenic Escherichia coli (ExPEC) is the most frequent pathogen in canine pyometra, accounting for 57–100% of cases. The aim of the present study was to determine the frequency of phylogenetic groups and virulence factors in E. coli strains isolated from the uterine and rectal swabs of bitches with pyometra (n = 72) and from rectal swabs from healthy bitches fed commercial dry feed (n = 53) or a raw meat-based diet (RMBD; n = 38). A total of 512 strains of E. coli were isolated and divided into five categories according to the origin of the sample: 120 isolates from the uterine content of dogs with E. coli pyometra, 102 from the feces of bitches with E. coli pyometra, 75 from the feces of bitches without E. coli pyometra, 130 feces samples from healthy dogs fed commercial feed, and 85 feces samples from healthy dogs fed a raw meat-based diet. E. coli strains belonging to the B2 phylogroup and positive for virulence factor genes associated with adhesion (fimbriae type P [papC]) and production of toxins (α-hemolysin [hlyA] and uropathogenic specific protein [usp]) predominated in the uterine content and rectal swabs of bitches with E. coli pyometra. Interestingly, a lower growth rate of E. coli from the B2 phylogroup was observed in dogs fed a RMBD than in those fed commercial dry feed. The present study suggests that intestinal colonization by certain types of E. coli could be a risk factor for the occurrence of E. coli pyometra in bitches and that diet can influence intestinal colonization by such strains.
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Abstract
Uterine diseases are common in dogs, particularly in countries where elective spaying is not usually performed. The associated clinical illnesses may be of varying degree ranging from merely decreased fertility to a critical pyometra requiring intensive care to survive. The diagnosis of some uterine diseases is generally uncomplicated, such as in a classic pyometra presenting with enlarged, fluid-filled uterus, purulent vaginal discharge and characteristic signs of illness or in other disorders associated with uterine enlargement. However, it can be more puzzling in diseases with normal uterine size and very mild or obscure clinical signs. It is important to recognize the uterine diseases early because of the risk of potentially life-threatening complications such as sepsis developing if treatment is delayed in cases where bacterial infection is present. In breeding bitches, an early diagnosis, that is when the disease has not developed extensively, will increase the possibility of non-surgical treatment options without increased risk and thereby also increasing chances of maintained fertility. Early diagnosis and treatment initiation are thus favourable for complete recovery, also in less severe uterine diseases and those without infection. Molecular markers are molecules in biological samples that can be measured for diagnostic purposes, outcome prediction, and for gaining more information about different physiological and pathological conditions. Examples of commonly evaluated markers include laboratory variables analysed in blood, urine, cytological or tissue biopsy samples. Regarding the genetic pre-disposition for different uterine diseases in dogs, information is lacking. Recently, the global gene expression in uterine tissue in dogs has been investigated more closely, and newly developed technologies provide excellent opportunities for identifying molecular markers worth exploring further. The focus of this review article is to highlight findings on markers relevant for diagnosis, prediction of prognosis and treatment outcome in the most common uterine diseases in dogs.
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Affiliation(s)
- R Hagman
- Department of Clinical Sciences, Swedish University of Agricultural Sciences, Uppsala, Sweden
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Ding HF, Liu BG, Gao YL, Zhong XH, Duan SS, Yuan L. Divergence of affinities, serotypes and virulence factor between CTX-M Escherichia coli and non-CTX-M producers. Poult Sci 2018; 97:980-985. [PMID: 29272527 DOI: 10.3382/ps/pex376] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Indexed: 11/20/2022] Open
Abstract
This study was undertaken to discern the differences of the multi-locus sequence typing (MLST), O serogroups, and virulence factors among 34 CTX-M-1 Escherichia coli, 49 CTX-M-9 strains and 23 non-CTX-M isolates from chickens in Henan province, China. The MLST scheme yielded 34 sequence types, in which ST155 and ST359 were frequent (17% and 15%, respectively) and associated with zoonotic disease. The irp-2 (20% versus 2%, P = 0.0001), traT (85.3% versus 56.5%, P = 0.019), and sfaS (70.6% versus 0, P = 0.021) were significantly more prevalent in CTX-M-1 E. coli than in non-CTX-M producers. Also, CTX-M-9 isolates carried more irp-2 (17% versus 2%, P = 0.023), iroN (71.4% versus 39.1%, P = 0.019), and iss (79.6% versus 39.1%, P = 0.002) genes. In conclusion, although the 106 isolates encompassed a great genetic diversity, the CTX-M isolates harbored more virulence factor genes than non-CTX-M producers.
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Affiliation(s)
- Hai-Feng Ding
- Henan Agricultural University, Zhengzhou 450002, China
| | - Bao-Guang Liu
- Henan Agricultural University, Zhengzhou 450002, China
| | - Yan-Ling Gao
- Animal Husbandry Bureau of Henan Province, Zhengzhou, 450008, China
| | | | - Sha-Sha Duan
- Henan Agricultural University, Zhengzhou 450002, China
| | - Li Yuan
- Henan Agricultural University, Zhengzhou 450002, China
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Immunomodulation in the canine endometrium by uteropathogenic Escherichia coli. Vet Res 2016; 47:114. [PMID: 27829462 PMCID: PMC5103487 DOI: 10.1186/s13567-016-0396-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 09/14/2016] [Indexed: 01/03/2023] Open
Abstract
This study was designed to evaluate the role of E. coli α-hemolysin (HlyA) in the pathogenesis of canine pyometra, and on the immune response of canine endometrial epithelial and stromal cells. In Experiment 1, the clinical, hematological, biochemical and uterine histological characteristics of β-hemolytic and non-hemolytic E. coli pyometra bitches were compared. More (p < 0.05) metritis cases were observed in β-hemolytic E. coli pyometra uteri than in non-hemolytic E. coli pyometra uteri. β-hemolytic E. coli pyometra endometria had higher gene transcription of IL-1β and IL-8 and lower gene transcription of IL-6 than non-hemolytic E. coli pyometra endometria (p < 0.01). In Experiment 2, the immune response of endometrial epithelial and stromal cells, to hemolytic (Pyo18) and non-hemolytic E. coli strains (Pyo18 with deleted hlya-Pyo18ΔhlyA- and Pyo14) were compared. Following 4 h of incubation, Pyo18 decreased epithelial cell numbers to 54% (p < 0.001), and induced death of all stromal cells (p < 0.0001), whereas Pyo18ΔhlyA and Pyo14 had no effect on cell numbers. Compared to Pyo18ΔhlyA and Pyo14, respectively, Pyo18 induced a lower transcription level of IL-1β (0.99 vs 152.0 vs 50.9 fold increase, p < 0.001), TNFα (3.2 vs 49.9 vs 12.9 fold increase, p < 0.05) and IL-10 (0.4 vs 3.6 vs 2.6 fold increase, p < 0.001) in stromal cells, after 1 h of incubation. This may be seen as an attempt of hemolytic E. coli to delay the activation of the immune response. In conclusion, endometrial epithelial and stromal cell damage induced by HlyA is a potential relevant step of E. coli virulence in the pathogenesis of pyometra.
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Affiliation(s)
- R Hagman
- Department of Clinical Sciences; Swedish University of Agricultural Sciences; Uppsala Sweden
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Maluta RP, Borges CA, Beraldo LG, Cardozo MV, Voorwald FA, Santana AM, Rigobelo EC, Toniollo GH, Avila FA. Frequencies of virulence genes and pulse field gel electrophoresis fingerprints in Escherichia coli isolates from canine pyometra. Vet J 2014; 202:393-5. [PMID: 25201253 DOI: 10.1016/j.tvjl.2014.08.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 08/13/2014] [Accepted: 08/15/2014] [Indexed: 10/24/2022]
Abstract
Escherichia coli is the most common bacterial agent isolated from canine pyometra. The frequencies of 24 virulence genes and pulsed field gel electrophoresis (PFGE) profiles were determined for 23 E. coli isolates from cases of canine pyometra in Brazil. The frequencies of virulence genes were 91.3% fimH, 91.3% irp-2, 82.6% fyuA, 56.5% iroN, 47.8% traT, 39.1% usp, 34.8% sfaD/E, 34.8% tsh, 30.4% papC, 30.4% hlyA, 26.1% papGIII, 26.1% cnf-1, 21.7% papE/F, 21.7% iss, 17.4% iutA, 17.4% ompT, 17.4% cvaC, 17.4% hlyF, 17.4% iucD, 13.0% iucC, 13.0% astA, 4.3% papGII, 0% afaB/C and 0% papGI. The high frequency of yersiniabactin (fyuA and irp2) and salmochelin (iroN) genes suggests that iron uptake systems might be important in the pathogenesis of canine pyometra. PFGE profiles of 19 isolates were heterogeneous, confirming that E. coli isolates from canine pyometra are unlikely to be epidemic clones.
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Affiliation(s)
- Renato P Maluta
- Programa de Pós Graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil.
| | - Clarissa A Borges
- Programa de Pós Graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil
| | - Lívia G Beraldo
- Programa de Pós Graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil
| | - Marita V Cardozo
- Programa de Pós Graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil
| | - Fabiana A Voorwald
- Departamento de Clínica e Cirurgia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil
| | - André M Santana
- Departamento de Clínica e Cirurgia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil
| | - Everlon C Rigobelo
- Departamento de Produção Vegetal, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil
| | - Gilson H Toniollo
- Departamento de Clínica e Cirurgia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil
| | - Fernando A Avila
- Programa de Pós Graduação em Microbiologia Agropecuária, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias de Jaboticabal, Universidade Estadual Paulista, Jaboticabal, São Paulo, Brazil
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Genotypic and phenotypic comparison of Escherichia coli from uterine infections with different outcomes: Clinical metritis in the cow and pyometra in the bitch. Vet Microbiol 2014; 170:109-16. [DOI: 10.1016/j.vetmic.2014.01.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 01/23/2014] [Accepted: 01/24/2014] [Indexed: 11/20/2022]
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Mateus L, Henriques S, Merino C, Pomba C, Lopes da Costa L, Silva E. Virulence genotypes of Escherichia coli canine isolates from pyometra, cystitis and fecal origin. Vet Microbiol 2013; 166:590-4. [DOI: 10.1016/j.vetmic.2013.07.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 07/12/2013] [Accepted: 07/13/2013] [Indexed: 11/30/2022]
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