NTP technical report on the toxicity studies of Methylene Bis(thiocyanate) (CAS No. 6317-18-6) Administered by Gavage to F344/N Rats and B6C3F1 Mice.

Toxicity report series Pub Date : 1993-12-01
L.T. Burka
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Abstract

Methylene bis(thiocyanate) is used as a biocide in a number of applications. Its major use is in water cooling systems and paper mills as an inhibitor of algae, fungi, and bacteria. Methylene bis(thiocyanate) was selected for study because of the potential for human exposure to the compound and because of the interest in organothiocyanates as a chemical class. Toxicity studies of methylene bis(thiocyanate) (approximately 98% pure) were conducted with male and female F344/N rats and B6C3F1 mice; the compound was administered to the animals by gavage in an aqueous methyl cellulose vehicle for 2 weeks or 13 weeks. In addition to these studies, the genetic toxicity of methylene bis(thiocyanate) was evaluated by determining mutagenicity in Salmonella typhimurium with and without S9 activation and frequency of micronucleated normochromatic erythrocytes in the peripheral blood of mice. In the 2-week studies, groups of five rats and five mice per sex were administered methylene bis(thiocyanate) at concentrations of 0, 10, 20, 40, 80, and 160 mg/kg body weight. All animals in the two highest dose groups (80 and 160 mg/kg) died by Day 2 of the studies. Except for one female rat, all animals receiving 40 mg/kg methylene bis(thiocyanate) also died before the end of the studies. Few significant gross lesions were observed in the 80 and 160 mg/kg groups. Clinical observations were similar to those reported for cyanide toxicity and included dyspnea, tremors. and ataxia. The stomach, which was identified as the target organ in rats and mice surviving for at least 24 hours, had necrotic inflammatory lesions of the mucosal surface of both the glandular and nonglandular portions. In the 13-week studies, groups of 10 rats and 10 mice per sex were administered methylene bis(thiocyanate) at concentrations of 0, 1, 2, 4, 8, and 16 mg/kg body weight. In the rat study, deaths occurred in the 2, 4, 8, and 16 mg/kg groups, while in the mouse study, deaths occurred only in the 8 and 16 mg/kg groups. As in the 2-week studies, the stomach was identified as the primary target organ. However, the lower doses administered in the 13-week studies resulted in gastric effects that were limited to the forestomach and consisted primarily of squamous mucosal hyperplasia and hyperkeratosis. Rats receiving the higher doses of methylene bis(thiocyanate) developed a mild anemia, and sperm motility was decreased in male rats receiving 4 or 8 mg/kg. Methylene bis(thiocyanate) was not mutagenic in S. typhimurium, with or without S9 activation. The frequencies of micronucleated normochromatic erythrocytes in the peripheral blood of dosed and control mice were similar. Chemical disposition studies of [14C]-labeled methylene bis(thiocyanate) were conducted in male F344 rats. In these studies, more than 90% of the administered radioactivity was eliminated in 48 hours. However, as the dose was increased from 0.2 to 1 to 10 mg/kg, greater percentages of the administered radioactivity remained in the tissues. Blood cyanide concentrations were increased shortly after the administration of 10 mg/kg [14C]-methylene bis(thiocyanate) but were similar to control values 2 hours after dosing. Overall, the toxic effects of methylene bis(thiocyanate) were consistent with those of an irritant chemical administered by gavage. There was also some indication that the release of cyanide may result in acute toxicity at the higher dose levels used in these studies. The no-observed-adverse-effect level for forestomach lesions in the 13-week studies was 4 mg/kg for male rats and 2 mg/kg for female rats and male and female mice. Synonyms: MBT; methylene-bis-thiocyanate; methylene bisthiocyanate; methylene dithiocyanate.

亚甲基双硫氰酸酯(CAS No. 6317-18-6)灌胃给药F344/N大鼠和B6C3F1小鼠的毒性研究技术报告。
亚甲基二硫氰酸酯在许多应用中被用作杀菌剂。它的主要用途是水冷却系统和造纸厂作为藻类,真菌和细菌的抑制剂。选择亚甲基二硫氰酸酯作为研究对象,是因为人类可能接触到这种化合物,也因为人们对有机硫氰酸酯作为一类化学物质很感兴趣。对雄性和雌性F344/N大鼠和B6C3F1小鼠进行了亚甲基双硫氰酸酯(纯度约为98%)的毒性研究;用甲基纤维素水溶液灌胃给药2周或13周。除了这些研究,亚甲基二硫氰酸酯的遗传毒性通过测定鼠伤寒沙门菌的诱变性和小鼠外周血中微核正染红细胞的频率来评估。在为期2周的研究中,每性别5只大鼠和5只小鼠被给予浓度为0、10、20、40、80和160 mg/kg体重的亚甲基二硫氰酸盐。两个最高剂量组(80和160 mg/kg)的所有动物在研究的第2天死亡。除一只雌性大鼠外,所有接受40 mg/kg亚甲基二硫氰酸盐的动物也在研究结束前死亡。80和160 mg/kg组很少观察到明显的肉眼病变。临床观察与报道的氰化物中毒相似,包括呼吸困难、震颤。和共济失调。在存活至少24小时的大鼠和小鼠中,胃被确定为靶器官,在腺和非腺部分的粘膜表面都有坏死的炎症性病变。在为期13周的研究中,每性别10只大鼠和10只小鼠被给予浓度为0、1、2、4、8和16 mg/kg体重的亚甲基二硫氰酸盐。在大鼠研究中,死亡发生在2、4、8和16 mg/kg组,而在小鼠研究中,死亡仅发生在8和16 mg/kg组。与2周的研究一样,胃被确定为主要靶器官。然而,在为期13周的研究中,低剂量给药导致的胃效应仅限于前胃,主要包括鳞状黏膜增生和角化过度。接受高剂量亚甲基二硫氰酸盐的大鼠出现轻度贫血,接受4或8 mg/kg亚甲基二硫氰酸盐的雄性大鼠精子活力下降。无论是否激活S9,亚甲基二硫氰酸酯对鼠伤寒沙门氏菌均无致突变性。给药小鼠和对照组外周血微核正色红细胞出现频率相似。对雄性F344大鼠进行了[14C]标记亚甲基二硫氰酸酯的化学处置研究。在这些研究中,超过90%的放射性物质在48小时内被消除。然而,当剂量从0.2 mg/kg增加到1 mg/kg到10 mg/kg时,组织中仍有较大比例的放射性残留。在给药10 mg/kg [14C]-亚甲基双硫氰酸盐后不久,血液氰化物浓度升高,但在给药后2小时与对照值相似。总的来说,亚甲基二硫氰酸酯的毒性作用与灌胃给予的刺激性化学物质一致。还有一些迹象表明,在这些研究中使用的较高剂量下,氰化物的释放可能导致急性毒性。在13周的研究中,未观察到的前胃病变不良反应水平为雄性大鼠4 mg/kg,雌性大鼠和雌雄小鼠2 mg/kg。同义词:MBT;methylene-bis-thiocyanate;亚甲基bisthiocyanate;亚甲基dithiocyanate。
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