毒理性
藻青菌毒素1(DTX1)是导致人类食用受污染的海产品后不久发生腹泻性贝类中毒(DSP)的软海绵酸类似物。DTX1能够在浓度超过50 nM时破坏Caco-2单层细胞的完整性。此外,共聚焦显微镜成像证实了紧密连接蛋白闭锁蛋白受到DTX1的影响。渗透性实验表明,只有DTX1能够在浓度超过100 nM时显著穿过肠上皮。这类毒素的作用机制主要是强力抑制丝氨酸/苏氨酸蛋白磷酸酶1(PP1)和2A(PP2A)。经DTX1处理的Caco-2单层细胞可能会破坏细胞间的紧密连接。紧密连接形成了通过细胞间隙扩散物质的物理屏障。
Dinophysistoxin 1 (DTX1) is the analogue of okadaic acid causing diarrheic shellfish poisoning (DSP) in humans shortly after the ingestion of contaminated seafood. DTX1 is able to disrupt the integrity of Caco-2 monolayer cells at concentrations above 50 nM. In addition, confocal microscopy imaging confirmed that the tight-junction protein, occludin, was affected by DTX1. Permeability assays revealed that only DTX1 was able to significantly cross the intestinal epithelium at concentrations above 100 nM. The mechanism of action of this group of toxins is mainly the potent inhibition of serine/threonine protein phosphatases 1 (PP1) and 2A (PP2A). DTX1-treated Caco-2 monolayers could damage tight-junctions among cells. Tight-junctions form the physical barrier to the diffusion of substances through the paracellular space.
来源:Toxin and Toxin Target Database (T3DB)