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
中科院分区:
文献类型:
--
作者:
Ueki,I;Ooi,GT;Tremblay,ML;Hurst,KR;Bach,LA;Boisclair,YR
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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影响因子:
56.9
作者:
Chan, JM;Stampfer, MJ;Pollak, M
通讯作者:
Pollak, M
影响因子:
4
作者:
S. C. Hughes;H. Mason;S. Franks;J. Holly
通讯作者:
J. Holly
影响因子:
20.3
作者:
John I. Jones;D. Clemmons
通讯作者:
John I. Jones;D. Clemmons
影响因子:
4.8
作者:
E. Chin;Jian Zhou;J. Dai;R. Baxter;C. Bondy
通讯作者:
C. Bondy
DOI:
10.1210/jcem.80.10.7559878
发表时间:
1995
期刊:
The Journal of clinical endocrinology and metabolism
影响因子:
--
作者:
S. Xu;S. Cwyfan;J. V. D. van der Stappen;J. Sansom;J. Burton;M. Donnelly;J. Holly
通讯作者:
J. Holly