Liver-specific γ-glutamyl carboxylase-deficient mice display bleeding diathesis and short life span.

Liver-specific γ-glutamyl carboxylase-deficient mice display bleeding diathesis and short life span.
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DOI:
10.1371/journal.pone.0088643
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Inoue S
Inoue S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Azuma K;Tsukui T;Ikeda K;Shiba S;Nakagawa K;Okano T;Urano T;Horie-Inoue K;Ouchi Y;Ikawa M;Inoue S

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维生素K是一种脂溶性维生素,在血液凝固和骨代谢中起重要作用。其功能之一是作为γ-谷氨酰羧化酶(Ggcx)的辅因子。常规敲除Ggcx会导致纯合子小鼠出生后不久死亡。我们通过在Ggcx的外显子6侧翼的位点插入loxP序列来创建Ggcx-floxed小鼠。通过将这些小鼠与白蛋白-Cre小鼠交配,我们产生了肝细胞特异性Ggcx缺陷小鼠(GgcxΔliver/Δliver小鼠)。与传统的Ggcx基因敲除小鼠相比,GgcxΔliver/Δliver小鼠肝脏中的Ggcx活性非常低,并在出生后存活数周。此外,与杂合子小鼠(Ggcx+/Δliver)相比,GgcxΔliver/Δliver小鼠的寿命较短。GgcxΔliver/Δliver小鼠表现出出血素质,伴有凝血因子II和IX活性降低。Ggcx-floxed小鼠可以证明在体内检查Ggcx功能是有用的。
Vitamin K is a fat-soluble vitamin that plays important roles in blood coagulation and bone metabolism. One of its functions is as a co-factor for γ-glutamyl carboxylase (Ggcx). Conventional knockout of Ggcx causes death shortly after birth in homozygous mice. We created Ggcx-floxed mice by inserting loxP sequences at the sites flanking exon 6 of Ggcx. By mating these mice with albumin-Cre mice, we generated Ggcx-deficient mice specifically in hepatocytes (GgcxΔliver/Δliver mice). In contrast to conventional Ggcx knockout mice, GgcxΔliver/Δliver mice had very low activity of Ggcx in the liver and survived several weeks after birth. Furthermore, compared with heterozygous mice (Ggcx+/Δliver), GgcxΔliver/Δliver mice had shorter life spans. GgcxΔliver/Δliver mice displayed bleeding diathesis, which was accompanied by decreased activity of coagulation factors II and IX. Ggcx-floxed mice can prove useful in examining Ggcx functions in vivo.
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