毒理性
识别:伏马毒素B1是伏马毒素中最普遍的一种,由真菌 Fusarium moniliforme 和其他 F. 属真菌产生。纯净物质是一种白色吸湿性粉末,可溶于水、乙腈-水和甲醇。该物质在食品加工温度和光照下稳定。伏马毒素B1是与玉米相关的最常见的真菌代谢物。当天气条件有利于玉米粒腐烂时,玉米中会显著积累。人类暴露:没有与这种化合物相关的急性毒性的确认记录。现有的相关性研究建议饮食暴露与食管癌之间存在关联。其他关于伏马毒素B1潜在致癌性的研究结论尚不明确。动物/植物研究:在所有测试的动物物种中,伏马毒素B1对小鼠、大鼠、马科动物、猪、兔子和非人灵长类动物都具有肝脏毒性。除了叙利亚仓鼠,只有在母体毒性同时或之后才会观察到胚胎毒性或致畸性。伏马毒素在大鼠、羊、小鼠和兔子中对肾脏有毒。在大鼠和兔子中,肾脏毒性发生在比肝脏毒性更低的剂量下。伏马毒素已知会导致马脑白质软化和猪肺水肿综合征。在某一品系的大鼠中,伏马毒素B1对雄性大鼠具有肝脏致癌性,在另一品系中具有肾脏致癌性。伏马毒素B1是 de novo 神经鞘脂代谢的特异性抑制剂。这种化合物抑制细胞生长,并在动物、植物和一些酵母(如酿酒酵母)中导致自由神经酰胺碱基的积累和脂质代谢的改变。它没有在大肠杆菌中诱导基因突变,也没有在原代大鼠肝细胞中诱导非计划性DNA合成,但在低浓度下诱导了剂量依赖性的染色体畸变增加。这种化合物对植物有毒,损害细胞膜并减少叶绿素合成。根据使用猪、产蛋鸡和长尾猴的研究,当口服给药时,这种化合物吸收不良,并且它迅速从血浆或循环中消除并在粪便中回收;胆汁排泄很重要;在一些动物中,肠肝循环很重要。少量在尿液中排出,有些残留在肝脏和肾脏中。
IDENTIFICATION: Fumonisin B1 is the most prevalent of the fumonisins and produced by the fungus Fusarium moniliforme and other F. species. The pure substance is a white hygroscopic powder and is soluble in water, acetonitrile-water and methanol. The material is stable at food processing temperatures and light. Fumonisin B1 is the most common fungal metabolite associated with maize. Significant accumulation in maize occurs when weather conditions favor kernel rot. HUMAN EXPOSURE: There are no confirmed records of acute toxicity associated with this compound. Available correlation studies suggest a link between dietary exposure and esophageal cancer. Other studies are inconclusive as to the potential carcinogenicity of Fumonisin B1. ANIMAL/PLANT STUDIES: Fumonisin B1 is hepatotoxic in all animal species tested including mice, rats, equids, pigs, rabbits and non-human primates. With the exception of Syrian hamsters, embryotoxicity or teratogenicity is only observed concurrent with or subsequent to maternal toxicity. Fumonisins are nephrotoxic in pigs, rats, sheep, mice and rabbits. In rats and rabbits, renal toxicity occurs at lower doses than hepatotoxicity. The fumonisins are known to cause equine leukoencephalomalacia and porcine pulmonary edema syndrome. It is hepatocarcinogenic to male rats in one strain and nephrocarcinogenic in another strain. Fumonisin B1 is a specific inhibitor of de novo sphingolipid metabolism. This compound inhibits cell growth and causes accumulation of free sphingoid bases and alteration of lipid metabolism in animals, plants and in some yeasts such as Saccharomyces cerevisae. It did not induce gene mutations in bacteria or unscheduled DNA synthesis in primary rat hepatocytes, but induced a dose dependent increase in chromosomal aberrations at low concentrations. This compound is phytotoxic, damages cell membranes and reduces chlorophyll synthesis. This compound is poorly absorbed when dosed orally based on studies using pigs, laying hens and Vervet monkeys and it is rapidly eliminated from the plasma or circulation and recovered in the feces; biliary excretion is important; enterohepatic cycling is important in some animals. Small amounts are excreted in the urine, and some is retained in the liver and kidney.[
来源:Hazardous Substances Data Bank (HSDB)