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Effect of Staphylococcus aureus and Streptococcus uberis on apoptosis of bovine mammary gland lymphocytes
October 2009
October 2009
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Abstract
The aim of this study was to determine whether lymphocyte apoptosis is modulated by
infections caused by Staphylococcus aureus and Streptococcus uberis. Samples of cell
populations were obtained by lavage of the mammary glands at 4 intervals (24, 48,
72 and 168 h) following infection. The percentage of apoptotic lymphocytes peaked
at 168 h after challenge with S. aureus or S. uberis. Subsequent experiments focused
on in vitro cultivation of mammary gland lymphocytes with S. aureus and S. uberis.
These experiments showed a lower percentage of apoptotic lymphocytes following 3h
of cultivating cells with bacteria than after cultivation without bacteria. The results
demonstrate that during both experimental infection of bovine mammary glands with
S. aureus or S. uberis and during in vitro cultivation of lymphocytes with S. aureus
or S. uberis, apoptosis of lymphocytes is delayed.
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