Increasing of temperature induces pathogenicity of Streptococcus agalactiae and the up-regulation of inflammatory related genes in infected Nile tilapia (Oreochromis niloticus)

Kayansamruaj, Pattanapon; Pirarat, Nopadon; Hirono, Ikuo; Rodkhum, Channarong

doi:10.1016/j.vetmic.2014.04.013

Cited by 77 publications

(53 citation statements)

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“…35 O C) significantly promotes expression of various virulent factors of S. agalactiae and resulted in a higher percentage cumulative mortality to compare to low temperature (28 O C) (Rodkhum et al, 2011;Kayansamruaj et al, 2014a). The low water temperature (26 ± 1 O C) during the experimental challenge might explain the low mortality and persistence of S. agalactiae in surviving fish in this study.…”

mentioning

confidence: 63%

“…In theory, the floating cages culture system, where the fish are naturally exposed to various potential pathogens, is predictably infected by multiple (Ariel and Owens, 1997;McGrogan et al, 1998;Figueiredo et al, 2005;Olivares-Fuster et al, 2008;Dong et al, in press;Kayansamruaj et al, 2014a;Kayansamruaj et al, 2014b). In contrast, A. veronii, P. shigeloides and V. cholerae are not welldescribed fish pathogens and have been identified as foodborne pathogens that could present a serious issue to consumer health (Joseph et al, 1991;Nadirah et al, 2012;Chen et al, 2013;Chen et al, 2014;Nguyen et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

“…The reality of disease outbreaks in cultured farms may in all probability be caused by multiple pathogen infections. Previously, some important pathogens devastating tilapia within intensively produced systems were reported, such as Streptococcus agalactiae (Olivares-Fuster et al, 2008;Kayansamruaj et al, 2014a;Kayansamruaj et al, 2014b), Flavobacterium columnare (Figueiredo et al 2005; press-a,b), Francisella sp. (Soto et al, 2009;Jeffery et al, 2010;Leal et al, 2014), Edwardsiella spp.…”

Section: Introductionmentioning

confidence: 99%

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Naturally concurrent infections of bacterial and viral pathogens in disease outbreaks in cultured Nile tilapia (Oreochromis niloticus) farms

et al. 2015

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confidence: 63%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Naturally concurrent infections of bacterial and viral pathogens in disease outbreaks in cultured Nile tilapia (Oreochromis niloticus) farms

et al. 2015

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“…Ces changements de température ont, par exemple, provoqué l'accroissement de la virulence de pathogènes tels que Vibrio harveyi, occasionnant des mortalités élevées sur les ormeaux (Travers et al, 2009). Dans le cas du tilapia Oreochromis niloticus, une plus grande (Kayansamruaj et al, 2014 ;Marcusso et al, 2015).…”

Section: Modification De La Températureunclassified

Les systèmes aquacoles face au changement climatique

Lazard¹

2017

Cah. Agric.

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Résumé -L'aquaculture contribue aujourd'hui pour environ 50 % à l'approvisionnement en ressources aquatiques destinées à la consommation humaine et cette part est amenée à s'accroître à l'avenir compte tenu de la stagnation des captures liées à la pêche. Si un certain nombre de travaux ont été effectués en vue d'évaluer l'impact du changement climatique sur la pêche, peu a encore été fait dans ce domaine sur l'aquaculture. Cet article de synthèse tente d'identifier les défis auxquels l'aquaculture aura à faire face dans un contexte de changement climatique et propose des voies, à la fois adaptatives et innovantes, pour répondre à ces défis. L'article se focalise particulièrement sur six composantes de l'environnement susceptibles de subir des modifications sous l'effet du changement climatique et d'avoir un impact direct sur l'aquaculture : l'augmentation du niveau des mers ; la modification de la température ; les précipitations, les crues et les sécheresses ; la disponibilité en eau ; la dégradation de la qualité des eaux et enfin l'acidification des océans. Les impacts indirects concernent quant à eux principalement l'approvisionnement en farine et huile de poissons, constituants stratégiques des aliments destinés aux élevages d'animaux aquatiques, dont la disponibilité est dépendante des débarquements des pêches minotières, elles-mêmes sensibles au changement climatique. Face au changement climatique, deux stratégies sont possibles. La première, adaptative, consiste à mettre en oeuvre des solutions qui permettent de prendre en compte les modifications du milieu (espèce adaptée, sélection de site) ; la deuxième consiste à imaginer des systèmes où les facteurs du milieu sont rigoureusement maîtrisés. Réciproquement, l'impact de l'aquaculture sur le changement climatique est évoqué. Enfin, les résultats d'une enquête conduite par la FAO en 2016 sur la situation des mesures prises dans diverses parties du monde pour faire face au changement climatique en matière d'aquaculture sont exposés. Mots clés : aquaculture / changement climatique / impacts / adaptation / nouveaux systèmes d'élevageAbstract -Aquaculture systems facing climate change. Aquaculture accounts today for approximately 50% of total aquatic products for human consumption. This contribution is expected to increase in the future taking into account the fact that capture fisheries are estimated to have reached their maximum level of catches. While some research has been carried out concerning the impact of climate change on capture fisheries, only very few has been done yet dealing with aquaculture. The present review paper aims at identifying the challenges aquaculture will need to face in this new context of climate change and at suggesting ways in order to forecast and overcome them. Six main components of the aquatic environment are investigated in view of their potential direct impact on aquaculture: sea level rise, changes in temperature, rainfall, river floods and droughts, water availability, water quality deterioration and ocean acidification...

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“…Group B Streptococcus (GBS), Streptococcus agalactiae, can colonize the human vaginal and rectal mucosa as a commensal organism (1-3) but can also cause a range of invasive infections in immunocompromised and older adults (4)(5)(6). GBS is also a broad-host-range pathogen capable of causing severe sepsis and meningoencephalitis in fish (7)(8)(9)(10)(11)(12), bovine mastitis (13)(14)(15), and human neonatal sepsis and meningitis (16)(17)(18)(19)(20)(21) and has been recently implicated in chorioamniosis (22,23), causing premature birth (24,25) and stillbirth (25,26). The current strategy to prevent GBS infection of neonates is intrapartum antibiotic prophylaxis (IAP) (27), i.e., intravenous antibiotics given to a woman during labor and delivery.…”

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confidence: 99%

Modification of the CpsA Protein Reveals a Role in Alteration of the Streptococcus agalactiae Cell Envelope

et al. 2015

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The bacterial cell envelope is a crucial first line of defense for a systemic pathogen, with production of capsular polysaccharides and maintenance of the peptidoglycan cell wall serving essential roles in survival in the host environment. The LytR-CpsA-Psr proteins are important for cell envelope maintenance in many Gram-positive species. In this study, we examined the role of the extracellular domain of the CpsA protein of the zoonotic pathogen group B Streptococcus in capsule production and cell wall integrity. CpsA has multiple functional domains, including a DNA-binding/transcriptional activation domain and a large extracellular domain. We demonstrated that episomal expression of extracellularly truncated CpsA causes a dominant-negative effect on capsule production when expressed in the wild-type strain. Regions of the extracellular domain essential to this phenotype were identified. The dominant-negative effect could be recapitulated by addition of purified CpsA protein or a short CpsA peptide to cultures of wild-type bacteria. Changes in cell wall morphology were also observed when the dominant-negative peptide was added to wild-type cultures. Fluorescently labeled CpsA peptide could be visualized bound at the mid-cell region near the division septae, suggesting a novel role for CpsA in cell division. Finally, expression of truncated CpsA also led to attenuation of virulence in zebrafish models of infection, to levels below that of a cpsA deletion strain, demonstrating the key role of the extracellular domain in virulence of GBS. Many bacterial pathogens can exist in the host as part of the normal microflora and only cause disease when they gain access to a normally sterile site, such as the bloodstream or cerebral spinal fluid, or when the host becomes immunocompromised. Group B Streptococcus (GBS), Streptococcus agalactiae, can colonize the human vaginal and rectal mucosa as a commensal organism (1-3) but can also cause a range of invasive infections in immunocompromised and older adults (4-6). GBS is also a broad-host-range pathogen capable of causing severe sepsis and meningoencephalitis in fish (7-12), bovine mastitis (13-15), and human neonatal sepsis and meningitis (16-21) and has been recently implicated in chorioamniosis (22, 23), causing premature birth (24, 25) and stillbirth (25,26). The current strategy to prevent GBS infection of neonates is intrapartum antibiotic prophylaxis (IAP) (27), i.e., intravenous antibiotics given to a woman during labor and delivery. IAP is administered either to women after a positive GBS culture during prenatal screening (27, 28) or if certain risk-based criteria are met (29, 30). Fortunately, this has led to a reduction in the incidence of GBS disease in the first week of life (early onset disease), but it has not changed the incidence of GBS disease in the first 3 months of life (late onset disease) (18,21,27).One mechanism allowing bacteria to successfully function as both a commensal and a pathogen is regulation of a polysaccharide capsule expression. This is...

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Increasing of temperature induces pathogenicity of Streptococcus agalactiae and the up-regulation of inflammatory related genes in infected Nile tilapia (Oreochromis niloticus)

Cited by 77 publications

References 30 publications

Naturally concurrent infections of bacterial and viral pathogens in disease outbreaks in cultured Nile tilapia (Oreochromis niloticus) farms

Naturally concurrent infections of bacterial and viral pathogens in disease outbreaks in cultured Nile tilapia (Oreochromis niloticus) farms

Les systèmes aquacoles face au changement climatique

Modification of the CpsA Protein Reveals a Role in Alteration of the Streptococcus agalactiae Cell Envelope

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