EFFECT OF HYPOPHYSECTOMY ON INSULIN-LIKE GROWTH-FACTOR (IGF)-1 BINDING-ACTIVITY OF SERUM IN CHICKENS

被引:10
作者
MORISHITA, D [1 ]
WAKITA, M [1 ]
HOSHINO, S [1 ]
机构
[1] MIE UNIV,FAC BIORESOURCES,TSU,MIE 514,JAPAN
来源
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-PHYSIOLOGY | 1993年 / 104卷 / 02期
关键词
D O I
10.1016/0300-9629(93)90314-T
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
1. Hypophysectomy elevated IGF-1 binding activity of serum concurrently with decreases in circulating concentrations of IGF-1 and growth hormone (GH). 2. When sera pooled from each experimental group were chromatographed on a Sephadex G-200 column, IGF-1 binding activity was mainly found in 150 and 30 kilodalton (kDa) proteins. 3. Most of the serum IGF-1 were distributed among 150 kDa protein fractions. 4. Hypophysectomy elevated IGF-1 binding activity of these proteins, especially that of 30 kDa protein. 5. The binding of [I-125]IGF-1 to the 30 kDa protein was inhibited by unlabelled IGF-1 but not by insulin, and saturated with a small amount of the ligand compared to the 150 kDa protein. 6. The IGF-1 binding activity of 30 kDa protein was dependent on GH status of chickens.
引用
收藏
页码:261 / 265
页数:5
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