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Inability of toxin inhibitors to neutralize enhanced toxicity caused by bacteria adherent to tissue culture cells.

机译:毒素抑制剂无法中和由粘附在组织培养细胞上的细菌引起的增强的毒性。

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Toxicity to Y-1 adrenal mouse cells caused by heat-labile toxin secreted by an enterotoxigenic strain of Escherichia coli (H-10407-p) was 40-fold enhanced in mixtures containing organisms capable of adhering to the Y-1 cells compared with monolayers exposed to organisms whose adherence was inhibited by mannoside. Severalfold the concentrations of anti-heat-labile toxin antibodies required to neutralize the toxicity of nonadherent bacteria were unable to neutralize the toxicity caused by adherent bacteria. The cytolytic activity toward tissue culture cells and mouse peritoneal macrophages caused by streptolysin S carried by Streptococcus pyogenes was severalfold increased in mixtures containing organisms capable of adhering to the target cells compared with mixtures containing nonadherent bacteria. The ability of trypan blue and RNA core to inhibit the cell-bound streptolysin S was determined in tissue culture cells containing adherent streptococci and mixtures of streptococci randomly colliding with erythrocytes. Both inhibitors were markedly less effective in neutralizing cytolysis than in their ability to neutralize hemolysis. We conclude that compared with toxins produced by nonadherent bacteria, those produced by bacteria adherent to cells are targeted more efficiently and become relatively inaccessible to neutralization by toxin inhibitors.
机译:与单层细胞相比,在含有能粘附于Y-1细胞的生物的混合物中,由大肠杆菌的产肠毒素菌株(H-10407-p)分泌的热不稳定毒素对Y-1肾上腺小鼠细胞的毒性提高了40倍。暴露于甘露糖苷抑制粘附的生物。中和非粘附细菌的毒性所需的抗热不稳定毒素抗体浓度的几倍无法中和由粘附细菌引起的毒性。化脓性链球菌携带的链球菌溶血素S引起的对组织培养细胞和小鼠腹膜巨噬细胞的溶细胞活性在含有能够粘附靶细胞的生物的混合物中比在非黏附细菌的混合物中增加了几倍。在含有粘附链球菌和随机与红细胞碰撞的链球菌混合物的组织培养细胞中,确定了锥虫蓝和RNA核心抑制细胞结合的链球菌溶血素S的能力。与中和溶血的能力相比,两种抑制剂对中和溶胞的效力均明显较低。我们得出的结论是,与非粘附细菌产生的毒素相比,粘附在细胞上的细菌产生的毒素被更有效地靶向,并且变得相对难以被毒素抑制剂中和。

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