Mitochondrial long chain fatty acid beta-oxidation in man and mouse.

Mitochondrial long chain fatty acid beta-oxidation in man and mouse.
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DOI:
10.1016/j.bbalip.2009.05.006
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发表时间:
2009-08
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Houten SM
Houten SM
中科院分区:
其他
文献类型:
--
作者:
Chegary M;Brinke Ht;Ruiter JP;Wijburg FA;Stoll MS;Minkler PE;van Weeghel M;Schulz H;Hoppel CL;Wanders RJ;Houten SM

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几种线粒体脂肪酸β-氧化(FAO)缺陷小鼠模型已经建立。到目前为止,这些模型对我们目前对病理生理学的理解贡献甚微。本研究的目的是探讨小鼠和人类FAO之间的差异。采用分析、生化和分子方法相结合的方法,我们比较了长链酰基辅酶a脱氢酶敲除(LCAD−/−)、超长链酰基辅酶a脱氢酶敲除(VLCAD−/−)和野生型小鼠的成纤维细胞与VLCAD缺陷患者和人类对照的成纤维细胞。我们表明,在小鼠中,LCAD和VLCAD在粮农组织中具有重叠和不同的作用。VLCAD的缺失显然得到了充分补偿,而LCAD的缺失则没有得到补偿。LCAD在油酸等不饱和脂肪酸的氧化中起着至关重要的作用,但在饱和脂肪酸的氧化中似乎是多余的。与之形成鲜明对比的是,男性的LCAD既不能在mRNA水平上检测到,也不能在蛋白质水平上检测到,这使得VLCAD在粮农组织中不可或缺。我们的发现为利用现有小鼠模型研究人类FAO缺陷的病理生理学开辟了新的途径。
Several mouse models for mitochondrial fatty acid β-oxidation (FAO) defects have been developed. So far, these models have contributed little to our current understanding of the pathophysiology. The objective of this study was to explore differences between murine and human FAO. Using a combination of analytical, biochemical and molecular methods, we compared fibroblasts of long chain acyl-CoA dehydrogenase knockout (LCAD−/−), very long chain acyl-CoA dehydrogenase knockout (VLCAD−/−) and wild type mice with fibroblasts of VLCAD-deficient patients and human controls. We show that in mice, LCAD and VLCAD have overlapping and distinct roles in FAO. The absence of VLCAD is apparently fully compensated, whereas LCAD deficiency is not. LCAD plays an essential role in the oxidation of unsaturated fatty acids such as oleic acid, but seems redundant in the oxidation of saturated fatty acids. In strong contrast, LCAD is neither detectable at the mRNA level nor at the protein level in men, making VLCAD indispensable in FAO. Our findings open new avenues to employ the existing mouse models to study the pathophysiology of human FAO defects.
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