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See detailPurification of the recombinant beta2 toxin (CPB2) from an enterotoxaemic bovine Clostridium perfringens strain and production of a specific immune serum
Lebrun, Maud; Filée, Patrice ULg; Galleni, Moreno ULg et al

in Protein Expression & Purification (2007), 55(1), 119-131

Overgrowth of Clostridium perfringens clones with production of one or more of its toxin(s) results in diverse digestive and systemic pathologies in human and animals, such as cattle enterotoxaemia. The ... [more ▼]

Overgrowth of Clostridium perfringens clones with production of one or more of its toxin(s) results in diverse digestive and systemic pathologies in human and animals, such as cattle enterotoxaemia. The so-called beta2 toxin (CPB2) is the most recently described major toxin produced by C perfringens. In this study, the cpb2 ORF (cpb2FM) from a cattle C perfringens-associated enterotoxaemia was cloned and sequenced. The cpb2FM and its deduced nucleotide sequence clearly corresponded to the epb2 allele considered as "consensus" and not to "atypical" allele, despite its "non-porcine" origin. Expression assays of the recombinant toxin CPB2FM were performed in Escherichia coli and Bacillus subtilis with the expression vector pBLTS72, and by genomic integration by double recombination in B. subtilis. Highest level of production was obtained with the expression vector in B. subtilis 168 strain. The recombinant CPB2FM protein was purified and a specific rabbit polyclonal antiserum was produced. Polyclonal antibodies could detect CPB2 production in supernatants of C. perfringens from enterotoxaemic cattle. (C) 2007 Elsevier Inc. All rights reserved. [less ▲]

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See detailLa tuberculose à Mycobacterium bovis : le point de vue du bactériologiste
Mainil, Jacques ULg

Scientific conference (2007)

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See detailEHEC dialogue with eucaryotic cells
Mainil, Jacques ULg

Conference (2007)

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See detailThe expression of Clostridium perfringens consensus beta2 toxin is associated with bovine enterotoxaemia syndrome
Lebrun, Maud; Filée, Patrice ULg; Mousset, Bénédicte ULg et al

in Veterinary Microbiology (2007), 120(1-2), 151-157

Clostridium perfringens has been implicated in a broad array of enteric infections including the fatal haemorrhagic enteritis/enterotoxaemia syndrome in cattle. The beta2 toxin (CPB2), encoded by cpb2, is ... [more ▼]

Clostridium perfringens has been implicated in a broad array of enteric infections including the fatal haemorrhagic enteritis/enterotoxaemia syndrome in cattle. The beta2 toxin (CPB2), encoded by cpb2, is suspected to be implicated in this syndrome. However, among C. perfringens isolates from cattle suspected of clostridial disease, an atypical allele was recently found to predominate at the cpb2 locus and atypical corresponding CPB2 proteins were shown to be poorly expressed, thus arguing against a biologically significant role of the beta2 toxin in clostridial diseases in cattle. This study compared genotype and phenotype of the beta2 toxin between C. perfringens isolates from a group of healthy calves (n = 14, 87 isolates) and from a group of enterotoxaemic calves (n = 8,41 isolates). PCR results revealed the exclusive presence of the typical "consensus" cpb2 in the enterotoxaernic group. Western blot analysis demonstrated that the typical variant of CPB2 was often expressed in isolates from enterotoxaemic calves (43.9%) and infrequently in isolates from healthy cattle (6.9%). These data suggest that the typical variant of the CPB2 toxin may play a role in the pathogenesis of cattle enterotoxaemia. (c) 2006 Elsevier B.V. All rights reserved. [less ▲]

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See detailHelenalin reduces Staphylococcus aureus infection in vitro and in vivo
Boulanger, D.; Brouillette, E.; Jaspar, F. et al

in Veterinary Microbiology (2007), 119(2-4), 330-338

Staphylococcus (S.) aureus is a major udder pathogen causing bovine mastitis. Some pro-inflammatory cytokines, including tumor necrosis factor-alpha (TNF-alpha), enhance extracellular and intracellular ... [more ▼]

Staphylococcus (S.) aureus is a major udder pathogen causing bovine mastitis. Some pro-inflammatory cytokines, including tumor necrosis factor-alpha (TNF-alpha), enhance extracellular and intracellular growth of S. aureus, indicating that the inflammatory process favors S. aureus infection. Helenalin is a sesquiterpene lactone with potent anti-inflammatory properties. This study was designed to evaluate the effects of helenalin on S. aureus infection. First, in vitro experiments were conducted. These studies revealed that proliferation of S. aureus in bovine mammary epithelial MAC-T cells treated in the presence or absence of TNF-alpha was markedly reduced in the presence of helenalin. Secondly, in vivo effects of helenalin were investigated. Lactating mice treated in the presence or absence of helenalin were challenged by the intramammary route with S. aureus and the bacteria in the mammary glands were counted 12 h after infection. Significantly less numbers of bacteria were recovered from the infected glands of helenalin-treated mice compared with untreated mice. Moreover, histological examination of mammary tissue from helenalin-treated mice that were challenged with S. aureus indicated that helenalin is able to significantly reduce leukocyte infiltration in the mammary gland following S. aureus inoculation. Our results show that helenalin reduces S. aureus intracellular growth and experimental S. aureus infection. We conclude that helenalin may be of potential interest in the treatment of S. aureus-induced mastitis in the bovine species. [less ▲]

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See detailCommon virulence factors and genetic relationships between O18 : K1 : H7 Escherichia coli isolates of human and avian origin
Moulin-Schouleur, M.; Schouler, C.; Tailliez, P. et al

in Journal of Clinical Microbiology (2006), 44(10), 3484-3492

Extraintestinal pathogenic (ExPEC) Escherichia coli strains of serotype 018:K1:H7 are mainly responsible for neonatal meningitis and sepsis in humans and belong to a limited number of closely related ... [more ▼]

Extraintestinal pathogenic (ExPEC) Escherichia coli strains of serotype 018:K1:H7 are mainly responsible for neonatal meningitis and sepsis in humans and belong to a limited number of closely related clones. The same serotype is also frequently isolated from the extraintestinal lesions of colibacillosis in poultry, but it is not well known to what extent human and avian strains of this particular serotype are related. Twenty-two ExPEC isolates of human origin and 33 isolates of avian origin were compared on the basis of their virulence determinants, lethality for chicks, pulsed-field gel electrophoresis (PFGE) patterns, and classification in the main phylogenetic groups. Both avian and human isolates were lethal for chicks and harbored similar virulence genotypes. A major virulence pattern, identified in 75% of the isolates, was characterized by the presence of F1 variant fimbriae; S fimbriae; IbeA; the aerobactin system; and genomic fragments A9, A12, D1, D7, D10, and D11 and by the absence of P fimbriae, F1C fimbriae, Afa adhesin, and CNF1. All but one of the avian and human isolates also belonged to major phylogenetic group B2. However, various subclonal populations could be distinguished by PFGE in relation to animal species and geographical origin. These results demonstrate that very closely related clones can be recovered from extraintestinal infections in humans and chickens and suggest that avian pathogenic E. coli isolates of serotype 018:K1:H7 are potential human pathogens. [less ▲]

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See detailClostridia and enterotoxaemia
Mainil, Jacques ULg

Conference (2006)

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See detailGenus Clostridium - Clostridia in medical, veterinary and food microbiology : Diagnosis and typing
Mainil, Jacques ULg

Book published by European Commission (2006)

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See detailLe lipopolysaccharide d’Escherichia coli : structure, biosynthèse et rôles
Szalo, Ioan Mihai ULg; Taminiau, Bernard ULg; Mainil, Jacques ULg

in Annales de Médecine Vétérinaire (2006), 150(2), 108-124

The lipopolysaccharide (LPS) is a major component of the surface of the Gram negative bacteria. The LPS is composed of three separately synthesized entities: the lipid A, the core oligosaccharide and the ... [more ▼]

The lipopolysaccharide (LPS) is a major component of the surface of the Gram negative bacteria. The LPS is composed of three separately synthesized entities: the lipid A, the core oligosaccharide and the O antigen, that will be linked together after their respective synthesis. The lipid A, embedded inside the outer membrane, is the proximal part of the LPS and the core is the medial part, whereas the O antigen represents the distal part free in the external environment. Amongst the Enterobacteriaceae family, the lipid A is structurally highly conserved and the variation in the structure of the core oligosaccharide is limited whereas the O antigen is the hypervariable region. Diverse biological activities have been associated with LPS, amongst which the endotoxinic activity carried by the lipid A, and the strain immunogenic specificity carried by the O antigen. In this review manuscript we summarize the state of knowledge on the structures and biosynthesis of the different components of the LPS of Escherichia coli and on their respective roles in the virulence of pathogenic bacteria. [less ▲]

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See detailBacteriological identification and antibiotic sensitivity testing
Mainil, Jacques ULg; Menozzi, M.; Pelkonen, S. et al

in Mainil, Jacques (Ed.) Genus Clostridium - Clostridia in medical, veterinary and food microbiology : Diagnosis and typing (2006)

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See detailSoft issue infections in animals
Mainil, Jacques ULg

in Mainil, Jacques (Ed.) Genus Clostridium - Clostridia in medical, veterinary and food microbiology : Diagnosis and typing (2006)

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