Laminin-binding protein of Streptococcus suis serotype 2 influences zinc acquisition and cytokine responses
Payen, Servane (University of Montreal)
Aranda Rodríguez, Jesús (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia)
Segura, Mariela (University of Montreal)
Gottschalk, Marcelo (University of Montreal)

Date:	2023
Abstract:	Streptococcus suis serotype 2 is an important bacterial pathogen of swine, responsible for substantial economic losses to the swine industry worldwide. The knowledge on the pathogenesis of the infection caused by S. suis is still poorly known. It has been previously described that S. suis possesses at least one lipoprotein with double laminin and zinc (Zn)-binding properties, which was described in the literature as either laminin-binding protein (Lmb, as in the current study), lipoprotein 103, CDS 0330 or AdcAII. In the present study, the role of the Lmb in the pathogenesis of the infection caused by S. suis serotype 2 was dissected. Using isogenic mutants, results showed that Lmb does not play an important role in the laminin-binding activity of S. suis, even when clearly exposed at the bacterial surface. In addition, the presence of this lipoprotein does not infuence bacterial adhesion to and invasion of porcine respiratory epithelial and brain endothelial cells and it does not increase the susceptibility of S. suis to phagocytosis. On the other hand, the Lmb was shown to play an important role as cytokine activator when tested in vitro with dendritic cells. Finally, this lipoprotein plays a critical role in Zn acquisition from the host environment allowing bacteria to grow in vivo. The signifcant lower virulence of the Lmb defective mutant may be related to a combination of a lower bacterial survival due to the incapacity to acquire Zn from their surrounding milieu and a reduced cytokine activation.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Streptococcus suis ; Lipoprotein ; Laminin-binding protein ; Zinc metabolism ; Virulence ; Cell adhesion and invasion ; Cytokines
Published in:	Veterinary research, Vol. 54 (January 2023) , art. 1, ISSN 1297-9716

DOI: 10.1186/s13567-022-01128-8
PMID: 36604750

13 p, 2.0 MB

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