Inhibition of carnitine palymitoyltransferase1b induces cardiac hypertrophy and mortality in mice.

Inhibition of carnitine palymitoyltransferase1b induces cardiac hypertrophy and mortality in mice.
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DOI:
10.1111/dom.12248
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发表时间:
2014-08
期刊:
Diabetes, obesity & metabolism
影响因子:
--
通讯作者:
Mynatt RL
Mynatt RL
中科院分区:
其他
文献类型:
--
作者:
Haynie KR;Vandanmagsar B;Wicks SE;Zhang J;Mynatt RL

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最近的报道表明,短期的药物抑制Cpt1可以改善骨骼肌的葡萄糖耐量和胰岛素敏感性。虽然这似乎对糖尿病的治疗很有希望,但这些Cpt1抑制剂并不是针对骨骼肌的,而是针对多种Cpt1亚型。为了评估抑制Cpt1b亚型的效果,我们产生了心脏和骨骼肌特异缺失Cpt1b,Cpt1bHM−/−的小鼠。这些小鼠似乎发育正常,体重与对照组小鼠相似。然而,到了15周大的时候,Cpt1bHM−/−小鼠开始死亡。Cpt1bHM−/−组小鼠的心脏是对照组的4倍。Cpt1bHM−/−小鼠也容易受到应激诱导的癫痫发作,并伴随着过早死亡的风险增加。我们的数据表明,长期抑制Cpt1b会造成严重的心脏风险,并强调试图通过目前的抑制剂靶向Cpt1来改善胰岛素敏感性是不可行的。
Recent reports suggest that short-term pharmacological Cpt1 inhibition improves skeletal muscle glucose tolerance and insulin sensitivity. While this appears promising for the treatment of diabetes these Cpt1 inhibitors are not specific to skeletal muscle and target multiple Cpt1 isoforms. To assess the effects of inhibiting the Cpt1b isoform we generated mice with a heart and skeletal muscle specific deletion of the Cpt1b, Cpt1bHM−/−. These mice seem to develop normally with similar bodyweights as control mice. However, by 15 weeks of age the Cpt1bHM−/− mice begin to die. The hearts of Cpt1bHM−/− mice were 4-times the size of controls. Cpt1bHM−/− mice were also subject to stress-induced seizures that accompanied an increased risk for premature mortality. Our data suggests that prolonged Cpt1b inhibition poses severe cardiac risk and emphasizes that attempts to improve insulin sensitivity by targeting Cpt1 with current inhibitors is not viable.
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