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Leghari A, Sabir R, Laghari S, Khand FM, Chandio MA, Magsi AS, Bhutto KUR, Hassan MF, Lakho SA, Lin H, Fan H. Comparative analysis of Streptococcus agalactiae serotypes Ia and II isolates from China and Pakistan in a murine model: A focus on pathogenesis and immune response. Microb Pathog 2024; 191:106675. [PMID: 38705216 DOI: 10.1016/j.micpath.2024.106675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 03/26/2024] [Accepted: 05/01/2024] [Indexed: 05/07/2024]
Abstract
Bovine mastitis, caused by Streptococcus agalactiae (Group B Streptococcus; GBS), poses significant economic challenges to the global dairy industry. Mouse models serves as valuable tools for assessing GBS-induced infections as an alternative to large animals. This study aimed to investigate the LD50 dose, organ bacterial load, and quantification of peritoneal leukocyte populations for GBS serotypes Ia and II isolates from China and Pakistan. Additionally, we measured indicators such as lactoferrin, albumin, and myeloperoxidase (MPO) activity. Pro-inflammatory cytokines (TNF-α, IL-1β, IL-6, and IL-2) and anti-inflammatory cytokines (IL-10 and TGF-β) in serum and tissue samples were evaluated using ELISA and qPCR, respectively. BALB/c mice (4 mice per group) received individual intraperitoneal injections of 100 μl containing specific bacterial inoculum concentrations (ranging from 105 to 109 CFU per mouse) of Chinese and Pakistani GBS isolates (serotypes Ia and II). Control groups received 100 μL of sterile PBS. Results revealed that the LD50 bacterial dose causing 50 % mortality in mice was 107 CFU. The highest bacterial load in all experimental groups was quantified in the peritoneum, followed by blood, mammary gland, liver, spleen, lungs, and brain. The most significant bacterial dissemination was observed in mice inoculated with Pakistani serotype Ia at 24 h, with a subsequent notable decline in bacterial counts at day 3. Notably, infection with Pakistani serotype Ia showed a trend of increased total leukocyte counts, significantly higher than Pakistani serotype II, Chinese Serotype Ia, and Chinese serotype II. A substantial influx of neutrophils and lymphocytes was observed in response to all tested serotypes, with Pakistani serotype Ia inducing a significantly higher influx compared to other groups (Pakistani serotype II, Chinese serotype Ia, and Chinese serotype II). Furthermore, TNF-α, IL-1β, IL-2, and IL-6 expressions were significantly increased in mice one day after infection with the Pakistani serotype Ia. Compared to mice infected with the Pakistani serotype II, Chinese Serotype Ia, and Chinese serotype II, those infected with the Pakistani serotype Ia isolate exhibited the highest production of IL-10 and TGF-β, along with significantly increased concentrations of lactoferrin, albumin, and MPO. These findings suggest that the persistence and severity of infection caused by the Pakistani serotype Ia may be linked to its ability to spread to deeper tissues. This study enhances our understanding of the clinical characteristics of bovine mastitis caused by S. agalactiae in China and Pakistan.
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Affiliation(s)
- Ambreen Leghari
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095, China; Shaheed Benazir Bhutto University of Veterinary and Animal Sciences Sakrand, 67210, Sindh, Pakistan
| | - Rabia Sabir
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095, China
| | - Sheereen Laghari
- Department of Food Engineering, Quaid-e-Awam University of Engineering, Science & Technology Nawabshah 67450, Sindh, Pakistan
| | - Faiz Muhammad Khand
- Shaheed Benazir Bhutto University of Veterinary and Animal Sciences Sakrand, 67210, Sindh, Pakistan
| | - Muhammad Ali Chandio
- Shaheed Benazir Bhutto University of Veterinary and Animal Sciences Sakrand, 67210, Sindh, Pakistan
| | - Abdul Samad Magsi
- Shaheed Benazir Bhutto University of Veterinary and Animal Sciences Sakrand, 67210, Sindh, Pakistan
| | | | - Mohammad Farooque Hassan
- Shaheed Benazir Bhutto University of Veterinary and Animal Sciences Sakrand, 67210, Sindh, Pakistan
| | - Shakeel Ahmed Lakho
- Shaheed Benazir Bhutto University of Veterinary and Animal Sciences Sakrand, 67210, Sindh, Pakistan
| | - Huixing Lin
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095, China; Jiangsu Co-innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, 225009, China
| | - Hongjie Fan
- MOE Joint International Research Laboratory of Animal Health and Food Safety, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, 210095, China; Jiangsu Co-innovation Center for the Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, 225009, China.
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Brouillette E, Goetz C, Droppa-Almeida D, Chamberland S, Jacques M, Malouin F. Secondary Staphylococcus aureus intramammary colonization is reduced by non-aureus staphylococci exoproducts. Microbes Infect 2021; 24:104879. [PMID: 34450272 DOI: 10.1016/j.micinf.2021.104879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/29/2021] [Accepted: 08/06/2021] [Indexed: 12/01/2022]
Abstract
Non-aureus staphylococci (NAS) and Staphylococcus aureus are pathogens that cause bovine mastitis, a costly disease for dairy farmers, however; many NAS are considered part of the normal udder microbiota. It has been suggested that through a mechanism that remains to be elucidated, NAS intramammary colonization can prevent subsequent infection with other bacterial pathogens. This study shows that in a murine mastitis model, secondary Staph. aureus intramammary colonization is reduced by exoproducts from Staph. chromogenes and Staph. simulans, both NAS, while Streptococcus spp. exoproducts have much less ability to affect the course of the infection caused by S. aureus.
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Affiliation(s)
- Eric Brouillette
- Département de biologie, Faculté des sciences, Université de Sherbrooke, Sherbrooke, QC, Canada, J1K 2R1; Canadian Mastitis Network and Regroupement de recherche pour un lait de qualité optimale (Op+lait), St-Hyacinthe, QC, Canada, J2S 2M2
| | - Coralie Goetz
- Département de pathologie et microbiologie, Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, QC, Canada, J2S 2M2; Canadian Mastitis Network and Regroupement de recherche pour un lait de qualité optimale (Op+lait), St-Hyacinthe, QC, Canada, J2S 2M2
| | - Daniela Droppa-Almeida
- Département de biologie, Faculté des sciences, Université de Sherbrooke, Sherbrooke, QC, Canada, J1K 2R1; Canadian Mastitis Network and Regroupement de recherche pour un lait de qualité optimale (Op+lait), St-Hyacinthe, QC, Canada, J2S 2M2
| | - Suzanne Chamberland
- Département de biologie, Faculté des sciences, Université de Sherbrooke, Sherbrooke, QC, Canada, J1K 2R1
| | - Mario Jacques
- Département de pathologie et microbiologie, Faculté de médecine vétérinaire, Université de Montréal, St-Hyacinthe, QC, Canada, J2S 2M2; Canadian Mastitis Network and Regroupement de recherche pour un lait de qualité optimale (Op+lait), St-Hyacinthe, QC, Canada, J2S 2M2
| | - François Malouin
- Département de biologie, Faculté des sciences, Université de Sherbrooke, Sherbrooke, QC, Canada, J1K 2R1; Canadian Mastitis Network and Regroupement de recherche pour un lait de qualité optimale (Op+lait), St-Hyacinthe, QC, Canada, J2S 2M2.
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