从患有皮肤炎的亚托皮狗中分离出来的Staphylococcus pseudintermedius诱导了杆细胞脱粒化
A Bell1, Y Nakamura2, R Langley3
1Dermvetonline, Auckland, New Zealand.
New Zealand veterinary journal
|August 12, 2025
概括
在体外和体内,来自亚托皮性狗的Staphylococcus pseudintermedius δ毒素会导致巨细胞脱粒化. 它的表达通过定数感应进行上调,这表明它在犬类亚托邦皮肤炎中发挥了作用.
科学领域:
- 兽医皮肤病学 兽医皮肤病学
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
背景情况:
- 伪中间体葡萄球菌 (Staphylococcus pseudintermedius) 是狗中皮肤炎的常见原因之一.
- 狗皮炎 (cAD) 是一种普遍的过敏性皮肤疾病.
- 葡萄球菌毒素与皮肤炎症和屏障功能障碍有关.
研究的目的:
- 在S. pseudintermedius中测序 δ-毒素 (hld) 和辅助基因调节器 (agr) 位点,从亚托皮狗中分离出来.
- 在体外和体内评估S. pseudintermedius δ-toxin的巨细胞降粒潜力.
- 为了研究 δ-毒素基因表达 (RNAIII) 的定数感知调节.
主要方法:
- 四个S. pseudintermedius分离物的全基因组测序.
- 在实验室中,使用合成 δ-毒素进行巨细胞脱粒试验.
- 在体内评估细菌过剂注射后犬皮肤中巨细胞脱粒的情况.
- 定量PCR测量不同细菌密度下的RNAIII表达.
主要成果:
- 确定了hld和agr元素的序列.
- 合成的S. pseudintermedius δ-毒素诱导的杆细胞脱粒化可与S. aureus δ-毒素相比较.
- 在暴露于含有δ-毒素的S. pseudintermedius过剂后,犬类巨细胞脱粒化在体内得到证实.
- 随着细菌细胞密度的增加,RNAIII的表达显著增加,这表明了定数感应控制.
结论:
- 从亚托皮性狗中分离出来的S. pseudintermedius具有δ-toxin的基因.
- 在体外和体内,δ-毒素可以降粒瘤细胞,这可能有助于cAD.
- 定数感应可能会调节这些隔离物中的d-毒素产量.
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