Incubation of Streptococcus uberis with extracellular matrix proteins enhances adherence to and internalization into bovine mammary epithelial cells

Two strains of Streptococcus uberis (UT 888 and UT 366) isolated from cows with clinical mastitis were co-cultured with bovine mammary epithelial cells (MAC-T) with and without laminin, fibrinogen, fibronectin or collagen. Incubation of S. uberis with extracellular matrix proteins (ECMPs) increased...

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Veröffentlicht in:FEMS microbiology letters 1999-09, Vol.178 (1), p.81-85
Hauptverfasser: Almeida, Raul A, Luther, Douglas A, Oliver, Stephen P
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creator Almeida, Raul A
Luther, Douglas A
Oliver, Stephen P
description Two strains of Streptococcus uberis (UT 888 and UT 366) isolated from cows with clinical mastitis were co-cultured with bovine mammary epithelial cells (MAC-T) with and without laminin, fibrinogen, fibronectin or collagen. Incubation of S. uberis with extracellular matrix proteins (ECMPs) increased adherence to and internalization into MAC-T cells. Both strains of S. uberis exhibited greater adherence when co-cultured in the presence of collagen than with any other ECMP. However, adherence was always higher when strains were co-cultured with ECMP than in medium alone. S. uberis UT 888 adhered better to MAC-T cells than S. uberis UT 366. The influence of ECMPs on bacterial internalization into MAC-T cells was similar to adherence, however, differences among ECMPs were less noticeable. S. uberis UT 888 had a higher internalization index than S. uberis UT 366. It is possible that ECMPs induce or up-regulate proteins that selectively adhere to ECMPs which could serve as a bridge between the eukaryotic cell and the bacterial pathogen that leads to internalization of the ECMP-bound pathogen into the mammary epithelial cell.
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source Oxford University Press Journals All Titles (1996-Current); Wiley Online Library All Journals; Alma/SFX Local Collection
subjects Adherence
cattle
Extracellular matrix protein
Internalization
matrix protein
Streptococcus uberis
title Incubation of Streptococcus uberis with extracellular matrix proteins enhances adherence to and internalization into bovine mammary epithelial cells
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