α-HCH在家兔体内以及氯丹在家鸡体内的手性和非手性动态分布
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摘要
HCHs和氯丹是在环境介质中广泛分布、并具有手性组分的持久性有机污染物。本研究采用体内暴露的方法,分别研究了α-HCH在家兔体内,以及顺式氯丹CC、反式氯丹TC、七氯HEP、环氧氯丹OXY和环氧七氯HEPX在家鸡体内的手性和非手性动态分布规律。
     一次性分别经口和经皮暴露后,α-HCH在家兔体内的动态变化相近。α-HCH在家兔体内的动态变化可由以血液和其他组织(合并)的两室毒代动力学模型较好拟合。分析表明,组织的血流通量和脂肪含量是影响α-HCH在家兔各组织中分布的重要因素,其中,暴露前、以及暴露后1440 min和5760 min时,家兔各组织中α-HCH浓度和脂含量显著正相关(p<0.01),但暴露10 min时相关不显著。家兔的肌肉和脂肪组织是α-HCH在家兔体内的主要贮存场所。
     经口/经皮暴露外消旋的α-HCH后,家兔各组织均选择性的富集右旋异构体(+)-α-HCH,且EF值随时间显著增加。各组织的EF值由大到小依次为,脑>肝>肠>肾≈肌肉≈脂肪。采用一室模型分别拟合血液中(+)-α-HCH和(-)-α-HCH的动力学变化,结果显示,经口和经皮吸收均不存在立体选择性,借此推测该对映选择主要由于选择性代谢,且(+)-α-HCH在家兔体内的代谢为其对映体的一半。家兔脑组织能够迅速而强烈地富集(+)-α-HCH,分析主要由于血脑屏障的选择性转运。
     一次性经口暴露工业氯丹后,可见CC、TC和HEP经由胃肠消化、吸收进入家鸡体内、并在各组织中分布等生物过程。顺反氯丹在家鸡中生物利用度高达98%。一室模型拟合得到CC和TC在家鸡体内的半衰期分别为13.4 h和12.5 h。暴露后,家鸡各组织中CC、TC和HEP浓度呈现先上升后下降的变化趋势,浓度高低依次为脂肪>肠>皮>肝>脑>肌肉>血液。暴露500 min后家鸡各组织中CC、TC和HEP浓度与组织脂含量均显著相关(p<0.05)。本研究建立的多室模型,基本可反映CC和TC在家鸡各组织中的动态变化。暴露后,代谢产物HEPX和OXY迅速生成,并集中分布在家鸡肝脏和脂肪组织中。经推测,HEPX很可能在家鸡体内发生进一步代谢,而OXY则可能具有相对较强的蓄积能力。
     经口暴露外消旋的工业氯丹后,家鸡各组织显著选择性的富集(-)-CC和(+)-TC。经对排泄物顺反氯丹的EF值进行分析,可基本排除吸收和排泄过程对家鸡选择性富集(-)-CC和(+)-TC的贡献。一室模型拟合结果表明,CC和TC一对对映体的吸收速率常数分别相同,而消除速率常数有所差异。可计算得到家鸡各组织顺反氯丹的近似EF值,其中脂肪、皮和肝脏组织中顺反氯丹的手性分异较强烈。本研究没有发现家鸡脑组织对顺反氯丹的手性富集相对其他组织有任何特异性。
Japanese Rabbits (Oyctolagus Cuniculus) were exposed toα-hexachlorocyclohexane (α-HCH) either orally or dermally and concentrations ofα-HCH and its two enantiomers were measured at different time intervals in the blood, intestine, liver, kidney, fat, brain, and muscle. The time trends were quantified using toxicokinetic models. It was found that absorption and elimination ofα-HCH in blood were first-order processes which can be characterized by a single compartmental kinetic model. The absorption of dermally exposedα-HCH in blood was more than one order of magnitude faster than that of orally exposedα-HCH. The transport ofα-HCH from the blood to other tissues was characterized using a two-compartment model. The accumulation rates were different among tissues depending on blood flow rate and fat content. Significant correlation was revealed betweenα-HCH and fat content for various tissues either before or 1 d after the exposure. However, there was no such correlation at 10 minutes immediately after the exposure.
     The enantiomeric fraction (EF) ofα-HCH in rabbit blood was nearly racemic before the exposure and increased to 0.73 and 0.82 after oral or dermal exposure, respectively. The result of a toxicokinetic modeling suggested that the strong enantioenrichment of (+)-α-HCH was primarily because the elimination rate of (-)-α-HCH was more than two times higher than that of (+)-α-HCH. The EFs for other tissues also increased dramatically after the exposure and the EFs in brain reached as high as 0.99.
     After a single oral exposure of technical chlordane, levels of CC, TC, HEP, HEPX and OXY were determined in gastrointestinal residues, droppings and various tissues of Chicken(Gallus gallus) at the time of 60, 120, 160, 200, 300, 500, 1000 and 2000 min. Interestingly, over 98% of CC and TC were bioaccessible for chicken, while only approximately 1.1% of CC and TC were directly excreted through droppings without further biotransformation. According to the single-compartment toxicokinetic modeling, CC and TC shared similar absorption rate in the whole body, while TC showed a slight more rapid elimination rate, with half-life of 13.4h for CC and 12.5h for TC. The metabolites of HEPX and OXY appeared as soon as 60 min after exposure, and were mainly accumulated in fat and liver tissues. Concentrations of CC, TC and HEP in chicken tissues roughly followed orders as fat > intestine > skin > liver > brain > muscle > blood. Levels of CC, TC and HEP in various tissues showed significant correlation with lipid content (p<0.05) since 500 min after exposure. A multi-compartment toxicokinetic model was developed to characterize the accumulation dynamics of CC and TC in the various tissues respectively.
     Tissues of chicken all enantioselectively accumulated (-)-CC and (+)-TC, while fat, skin and liver tissues showed relatively stronger capacity of enantio-enrichments. The EFs of droppings remained nearly racemic at first, but gradually decreased less than 0.5 for CC and increased more than 0.5 for TC, which could rule out the enantioselective absorption and excretion of CC and TC in chicken. The one-compartment toxicokinetic model was applied for the individual enantiomers of CC and TC, respectively, and different elimination rates but similar absorption rates were observed between the enantiomers for both CC and TC. Compared with other tissues, brain tissues of chicken didn’t showed accumulated (-)-CC and (+)-TC to any different extent.
引文
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