Cyp26a1 supports postnatal retinoic acid homeostasis and glucoregulatory control.

Cyp26a1 supports postnatal retinoic acid homeostasis and glucoregulatory control.
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DOI:
10.1016/j.jbc.2023.104669
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发表时间:
2023-05
影响因子:
4.8
通讯作者:
Napoli, Joseph L.
Napoli, Joseph L.
中科院分区:
生物学2区
文献类型:
--
作者:
Yoo, Hong Sik;Cockrum, Michael A.;Napoli, Joseph L.

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大量证据证实了Cyp26a1在胚胎发育过程中对全反式维甲酸(RA)体内平衡的重要性。相比之下,尽管它作为一种潜在的主要RA分解代谢酶存在于出生后的肝脏中,并且对RA的诱导具有急性敏感性,但一些数据表明,Cyp26a1对出生后内源性RA体内平衡的贡献微乎其微。我们报告了对出生后小鼠条件性敲低Cyp26a1的重新评估。目前的结果显示,野生型(WT)小鼠肝脏中的Cyp26a1信使核糖核酸(mRNA)在禁食后重新喂食时增加16倍,同时RA消除速率加快,RA浓度降低41%。相比之下,重新喂食的纯合敲低小鼠中Cyp26a1 mRNA仅达到野生型重新喂食时水平的2%,同时RA分解代谢速率较慢,与禁食时相比肝脏RA无下降。与野生型相比,重新喂食的纯合敲低小鼠还表现出Akt1和Akt2磷酸化水平降低、丙酮酸脱氢酶激酶4(Pdk4)mRNA减少,以及葡萄糖激酶(Gck)mRNA增加、糖原磷酸化酶(Pygl)磷酸化增强和血清葡萄糖升高。禁食的纯合敲低小鼠相对于野生型,胰高血糖素/胰岛素比值升高。这些数据表明,Cyp26a1在调节出生后肝脏内源性RA浓度方面发挥着重要作用,并且对血糖调节控制至关重要。
Considerable evidence confirms the importance of Cyp26a1 to all-trans-retinoic acid (RA) homeostasis during embryogenesis. In contrast, despite its presence in postnatal liver as a potential major RA catabolizing enzyme and its acute sensitivity to induction by RA, some data suggested that Cyp26a1 contributes only marginally to endogenous RA homeostasis postnatally. We report reevaluation of a conditional Cyp26a1 knockdown in the postnatal mouse. The current results show that Cyp26a1 mRNA in WT mouse liver increases 16-fold upon refeeding after a fast, accompanied by an increased rate of RA elimination and a 41% decrease in the RA concentration. In contrast, Cyp26a1 mRNA in the refed homozygotic knockdown reached only 2% of its extent in WT during refeeding, accompanied by a slower rate of RA catabolism and no decrease in liver RA, relative to fasting. Refed homozygous knockdown mice also had decreased Akt1 and 2 phosphorylation and pyruvate dehydrogenase kinase 4 (Pdk4) mRNA and increased glucokinase (Gck) mRNA, glycogen phosphorylase (Pygl) phosphorylation, and serum glucose, relative to WT. Fasted homozygous knockdown mice had increased glucagon/insulin relative to WT. These data indicate that Cyp26a1 participates prominently in moderating the postnatal liver concentration of endogenous RA and contributes essentially to glucoregulatory control.
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