The Antiphagocytic Activity of SeM of Streptococcus equi Requires Capsule

Resistance to phagocytosis is a crucial virulence property of Streptococcus equi (Streptococcus equi subsp. equi; Se), the cause of equine strangles. The contribution and interdependence of capsule and SeM to killing in equine blood and neutrophils were investigated in naturally occurring strains of...

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Bibliographic Details
Published in:Journal of Equine Science 2014, Vol.25(2), pp.53-56
Main Authors: TIMONEY, John F., SUTHER, Pranav, VELINENI, Sridhar, ARTIUSHIN, Sergey C.
Format: Article
Language:English
Subjects:
Animal diseases
capsule
Horses
phagocytosis
SeM
Streptococcus equi
Streptococcus infections
Veterinary medicine
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Summary:Resistance to phagocytosis is a crucial virulence property of Streptococcus equi (Streptococcus equi subsp. equi; Se), the cause of equine strangles. The contribution and interdependence of capsule and SeM to killing in equine blood and neutrophils were investigated in naturally occurring strains of Se. Strains CF32, SF463 were capsule and SeM positive, strains Lex90, Lex93 were capsule negative and SeM positive and strains Se19, Se1-8 were capsule positive and SeM deficient. Phagocytosis and killing of Se19, Se1-8, Lex90 and Lex93 in equine blood and by neutrophils suspended in serum were significantly (P ≤ 0.02) greater compared to CF32 and SF463. The results indicate capsule and SeM are both required for resistance to phagocytosis and killing and that the anti-phagocytic property of SeM is greatly reduced in the absence of capsule.
ISSN:1340-3516
1347-7501
DOI:10.1294/jes.25.53