Inactivation of the acid labile subunit gene in mice results in mild retardation of postnatal growth despite profound disruptions in the circulating insulin-like growth factor system.

Inactivation of the acid labile subunit gene in mice results in mild retardation of postnatal growth despite profound disruptions in the circulating insulin-like growth factor system.
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尽管循环中的胰岛素样生长因子系统受到严重破坏,但小鼠酸不稳定亚基基因的失活会导致出生后生长的轻度迟缓。

DOI:
10.1073/pnas.120172697
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发表时间:
2000
影响因子:
11.1
通讯作者:
Boisclair,YR
Boisclair,YR
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ueki,I;Ooi,GT;Tremblay,ML;Hurst,KR;Bach,LA;Boisclair,YR

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胰岛素样生长因子(IGFs)I和II是细胞增殖和分化的重要调节因子。出生后,主要代表肝源性IGF的血浆IGF以150 kDa的三元复合物循环,该三元复合物由IGF、IGF结合蛋白(IGFBP)3和酸不稳定亚基(ALS)中的每一个分子组成。出生后ALS合成的开始是驱动三元复合物形成的主要因素。ALS捕获IGF被认为允许血浆储库的发展,而没有负面影响,如低血糖和细胞增殖。为了评估ALS和三元复合物的重要性,我们创造了ALS基因被灭活的小鼠。该突变以孟德尔方式遗传,对存活率和出生体重没有任何影响。在3周后的生命中,在裸小鼠中观察到生长缺陷,并且在10周时达到13%。尽管血浆IGF-I和IGFBP-3的浓度分别降低了62%和88%,但仍观察到了这种适度的表型。营业额增加解释了这些减少,因为肝脏和肾脏的合成指数没有降低。令人惊讶的是,没有ALS并不影响葡萄糖和胰岛素的稳态。因此,ALS是出生后IGF-I和IGFBP-3积累所必需的,但与支持本地产生的IGF-I的主要作用的研究结果一致,对生长并不重要。这个模型应该是有用的,以确定是否存在ALS是需要其他行动的肝脏衍生的IGF-I和维持体内平衡的存在下,高循环水平的IGF-II。
Insulin-like growth factors (IGFs) I and II are important regulators of cell proliferation and differentiation. After birth, plasma IGFs, representing mostly liver-derived IGFs, circulate in ternary complexes of 150 kDa consisting of one molecule each of IGF, IGF-binding protein (IGFBP) 3, and an acid labile subunit (ALS). Onset of ALS synthesis after birth is the primary factor driving the formation of ternary complexes. Capture of IGFs by ALS is thought to allow the development of a plasma reservoir without negative effects such as hypoglycemia and cell proliferation. To evaluate the importance of ALS and ternary complexes, we have created mice in which theALSgene has been inactivated. The mutation was inherited in a Mendelian manner, without any effects on survival rates and birth weights. A growth deficit was observed in null mice after 3 weeks of life and reached 13% by 10 weeks. This modest phenotype was observed despite reductions of 62 and 88% in the concentrations of plasma IGF-I and IGFBP-3, respectively. Increased turnover accounted for these reductions because indices of synthesis in liver and kidney were not decreased. Surprisingly, absence of ALS did not affect glucose and insulin homeostasis. Therefore, ALS is required for postnatal accumulation of IGF-I and IGFBP-3 but, consistent with findings supporting a predominant role for locally produced IGF-I, is not critical for growth. This model should be useful to determine whether presence of ALS is needed for other actions of liver-derived IGF-I and for maintenance of homeostasis in presence of high circulating levels of IGF-II.
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