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CpG-ODN enhances mammary gland defense during mastitis induced by Escherichia coli infection in goats

文献类型： 外文期刊

作者： Zhu, Yu-Min 1 ; Mao, Jin-Feng 2 ; Zhang, Yuan-Shu 2 ; Li, Zhen 2 ; Zou, Si-Xiang 2 ; Deng, Yue -E 2 ;

作者机构： 1.Nanjing Agr Univ, Coll Vet Med, Nanjing 210095, Peoples R China

2.Nanjing Agr Univ, Coll Vet Med, Nanjing 210095, Peoples R China; Shanghai Acad Agr Sci, Anim & Vet Sci Res Inst, Shanghai, Peoples R China

期刊名称：VETERINARY IMMUNOLOGY AND IMMUNOPATHOLOGY （ 影响因子：2.046； 五年影响因子：2.217 ）

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收录情况： SCI

摘要： Seven healthy native goats in early lactation, weighing 30-40kg, were used in this study. The right mammary gland of the seven does were infused with CpG-ODN at a dosage of 100 mu gkg super(-) super(1) body weight on the day 5 postpartum (PP). The left glands were used as controls and infused with sterile phosphate-buffered saline (PBS). On day 8 PP, the same dosage of CpG-ODN or PBS was again infused. On day 9 PP, the mammary glands (both right and left) of the seven does were infused with 6x10 super(6) colony-forming units (CFU) Escherichia coli and, at 0, 8, 16, 24, 48 and 72h postinfection (PI), milk samples were collected from all glands. Goats were euthanized at 72h PI and the mammary tissue harvested. Infusion with 6x10 super(6)CFUml super(-) super(1)E. coli induced acute mastitis. Histopathological evaluations showed that polymorphonuclear neutrophils (PMNs) were still present in alveoli at 72h PI, but PMNs in the CpG-ODN-treated glands has disappeared. Bacteria counts in milk peaked at 16h PI and CpG-ODN induced a significant decrease in viable bacteria from 16h PI until the end of the experiment. This study showed that CpG-ODN promoted the expression of its specific receptor (TLR-9 mRNA) in mammary tissue, stimulated IL-6 production, reduced bacteria counts in milk, attenuated the impact of inflammation mediators on cells and significantly shortened the inflammation course. These results suggest that the CpG-ODN improved mammary gland defense and, thereby, had a beneficial effects against mastitis caused by E. coli infection in goats.

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