NDLI: Differential Abilities of Capsulated and Noncapsulated Staphylococcus aureus Isolates from Diverse agr Groups To Invade Mammary Epithelial Cells▿

Content Provider	PubMed Central
Author	Buzzola, Fernanda R. Alvarez, Lucía P. Tuchscherr, Lorena P. N. Barbagelata, María S. Lattar, Santiago M. Calvinho, Luis Sordelli, Daniel O.
Copyright Year	2007
Abstract	Staphylococcus aureus is the bacterium most frequently isolated from milk of bovines with mastitis. Four allelic groups, which interfere with the regulatory activities among the different groups, have been identified in the accessory gene regulator (agr) system. The aim of this study was to ascertain the prevalence of the different agr groups in capsulated and noncapsulated S. aureus bacteria isolated from mastitic bovines in Argentina and whether a given agr group was associated with MAC-T cell invasion and in vivo persistence. Eighty-eight percent of the bovine S. aureus strains were classified in agr group I. The remainder belonged in agr groups II, III, and IV (2, 8, and 2%, respectively). By restriction fragment length polymorphism analysis after PCR amplification of the agr locus variable region, six agr restriction types were identified. All agr group I strains presented a unique allele (A/1), whereas strains from groups II, III, and IV exhibited more diversity. Bovine S. aureus strains defined as being in agr group I (capsulated or noncapsulated) showed significantly increased abilities to be internalized within MAC-T cells, compared with isolates from agr groups II, III, and IV. agr group II or IV S. aureus strains were cleared more efficiently than agr group I strains from the murine mammary gland. The results suggest that agr group I S. aureus strains are more efficiently internalized within epithelial cells and can persist in higher numbers in mammary gland tissue than S. aureus strains classified in agr group II, III, or IV.
Related Links	http://dx.doi.org/10.1128/IAI.01215-06
Starting Page	886
File Format	PDF
ISSN	10985522
e-ISSN	10985522
Journal	Infection and Immunity
Issue Number	2
Volume Number	75
Language	English
Publisher	American Society for Microbiology
Publisher Date	2007-02-01
Access Restriction	Open
Rights Holder	American Society for Microbiology
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Infectious Diseases Parasitology Immunology Microbiology

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