人类和老鼠ABCC4/Abcc4对代谢物的不同选择性
Brayden D Whitlock1, Yingze Ma1, Gwenaëlle Conseil1
1Department of Physiology (B.D.W., Y.M., A.R.O., M.B., D.P.S., E.M.L.), Membrane Protein Disease Research Group (B.D.W., Y.M., M.B., D.P.S., E.M.L.), and Division of Analytical and Environmental Toxicology, Department of Laboratory Medicine and Pathology (X.C.L., E.M.L.), University of Alberta, Edmonton, Alberta, Canada; Department of Pathology and Molecular Medicine, Division of Cancer Biology and Genetics, Sinclair Cancer Research Institute, Queen's University, Kingston, Ontario, Canada (G.C., S.P.C.C.); Department of Obstetrics, Gynecology and Reproductive Sciences, Yale University School of Medicine, New Haven, Connecticut (Z.P.L.); and Department of Pharmaceutical Sciences, St. Jude Children's Research Hospital, Memphis, Tennessee (Y.W., J.D.S.).
鼠标Abcc4 (mABCC4) 不像人类同类 (hABCC4) 不能携带物种. 传送器功能的这种差异可能解释了为什么在动物中与人类相比具有较差的致癌性.
科学领域:
- 环境健康 环境健康
- 毒理学 毒理学 毒理学
- 分子生物学分子生物学
背景情况:
- 全球数百万人接触到饮用水中的,这是已知的人类致癌物.
- 动物对的致癌性敏感性较小,这表明了特定物种的毒动力学差异.
- 人体的转运体 hABCC4 在排泄有毒代谢物中发挥作用.
研究的目的:
- 为了调查小鼠Abcc4 (mAbcc4) 是否以类似于 hABCC4.4 的方式运输物种.
- 为了确定mAbcc4是否赋予细胞中对化合物的耐药性.
- 了解mAbcc4在特定物种的毒动力学中的作用.
主要方法:
- 对抗ABCC4抗体M4I-10的表皮图绘制,以量化 hABCC4和mAbcc4水平.
- 在HEK293细胞中表达mAbcc4,以测试对的耐药性和传输.
- 从感染过的细胞中制备膜囊泡,以评估输送活动.
- 野生类型和ABCC4-Knockout小鼠胚胎纤维细胞中酸盐耐药性的比较.
主要成果:
- mAbcc4在HEK293细胞中没有对任何测试的物种进行保护.
- mAbcc4没有运输关键的代谢物MMA (GS) 2和DMA (V).
- 虽然Abcc4(+/+) MEFs对酸盐有轻微的耐药性,但它并非由mAbcc4.
结论:
- 在测试条件下,素不是mAbcc4的基质.
- 在 hABCC4和mAbcc4.4之间的基质选择性存在显著差异.
- 不同的转运器功能可能有助于观察到人类和小鼠之间毒动因学的差异.
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