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Infection and Immunity, February 2000, p. 637-643, Vol. 68, No. 2
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Streptococcus suis Serotype 2 Interactions with Human Brain Microvascular Endothelial Cells

Nathalie Charland,1,dagger Victor Nizet,2 Craig E. Rubens,3 Kwang Sik Kim,4 Sonia Lacouture,1 and Marcelo Gottschalk1,*

Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculté de Médecine Vétérinaire, Université de Montréal, Saint-Hyacinthe, Québec, Canada J2S 7C61; Division of Pediatric Infectious Diseases, University of California, San Diego, La Jolla, California 92093-06722; Division of Infectious Diseases, Children's Hospital and Medical Center, Seattle, Washington 981053; and Division of Infectious Diseases, Children's Hospital Los Angeles, Los Angeles, California 900274

Received 19 July 1999/Returned for modification 11 October 1999/Accepted 18 November 1999

Streptococcus suis serotype 2 is a worldwide causative agent of many forms of swine infection and is also recognized as a zoonotic agent causing human disease, including meningitis. The pathogenesis of S. suis infections is poorly understood. Bacteria circulate in the bloodstream in the nonimmune host until they come in contact with brain microvascular endothelial cells (BMEC) forming the blood-brain barrier. The bacterial polysaccharide capsule confers antiphagocytic properties. It is known that group B streptococci (GBS) invade and damage BMEC, which may be a primary step in the pathogenesis of neonatal meningitis. Interactions between S. suis and human endothelial cells were studied to determine if they differ from those between GBS and endothelial cells. Invasion assays performed with BMEC and human umbilical vein endothelial cells demonstrated that unlike GBS, S. suis serotype 2 could not invade either type of cell. Adherence assays showed that S. suis adhered only to BMEC, whereas GBS adhered to both types of cell. These interactions were not affected by the presence of a capsule, since acapsular mutants from both bacterial species adhered similarly compared to the wild-type strains. Lactate dehydrogenase release measurements indicated that some S. suis strains were highly cytotoxic for BMEC, even more than GBS, whereas others were not toxic at all. Cell damage was related to suilysin (S. suis hemolysin) production, since only suilysin-producing strains were cytotoxic and cytotoxicity could be inhibited by cholesterol and antisuilysin antibodies. It is possible that hemolysin-positive S. suis strains use adherence and suilysin-induced BMEC injury, as opposed to direct cellular invasion, to proceed from the circulation to the central nervous system.

* Corresponding author. Mailing address: Groupe de Recherche sur les Maladies Infectieuses du Porc, Faculté de Médecine Vétérinaire, Université de Montréal, C.P. 5000, Saint-Hyacinthe, Québec, Canada J2S 7C6. Phone: (450) 773-8521, ext. 8374. Fax: (450) 778-8108. E-mail: gottschm{at}medvet.umontreal.ca.

dagger Present address: Unité de Recherche en Vaccinologie, Centre Hospitalier Universitaire de Québec, Sainte-Foy, Québec, Canada G1V 4G2.

Infection and Immunity, February 2000, p. 637-643, Vol. 68, No. 2
0019-9567/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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