The IGF-I axis in kidney and skeletal muscle of potassium deficient rats.

The IGF-I axis in kidney and skeletal muscle of potassium deficient rats.
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缺钾大鼠肾脏和骨骼肌中的 IGF-I 轴。

DOI:
10.1038/ki.1997.342
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发表时间:
1997
影响因子:
19.6
通讯作者:
R. Rabkin
R. Rabkin
中科院分区:
医学1区
文献类型:
--
作者:
F. Hsu;T. Tsao;R. Rabkin

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缺钾可导致大鼠生长迟缓、肌肉萎缩和肾脏肥大。这项研究验证了缺钾导致组织局部IGF-I系统的明显变化以及细胞对IGF-I的敏感性,IGF-I一方面有利于肾脏增大,另一方面损害肌肉生长。在缺钾8天的大鼠中,与配对喂养的对照组相比,食物利用率以及肌肉和身体的重量增加都有所减弱,而肾脏却增大了。在肌肉GH受体和IGF-I基因表达中,IGF-I多肽和IGF结合蛋白-5(IGFBP)水平降低。随着食物利用率的降低,这些变化可能会导致肌肉生长减弱。在增大的肾脏中,尽管IGF-I mRNA水平下降,但IGF-I多肽浓度增加了一倍以上。缺钾时肾脏IGFBP-1基因和蛋白表达增加,肾脏IGF-I降解活性降低,可能是导致IGF-I表达增加的原因。IGF-I治疗未能诱导身体或肌肉生长,但导致肾脏大小和脾进一步增大。因此,缺钾时肾脏中对IGF-I敏感的IGF-I水平的自发升高很可能是肾脏肥大的原因之一。
Potassium deficiency in the rat results in growth retardation, muscle wasting and renal hypertrophy. This study tests the thesis that K deficiency leads to tissue distinct changes in the local IGF-I system and cell sensitivity to IGF-I that favors renal enlargement on the one hand and impaired muscle growth on the other. In rats after eight days of K deficiency, compared to pair-fed control rats, food utilization and muscle and body wt gain were attenuated while the kidneys enlarged. In muscle GH receptor and IGF-I gene expression, IGF-I peptide and IGF binding protein-5 (IGFBP) levels were decreased. Together with reduced food utilization, these changes may contribute to the attenuated muscle growth. In the enlarged kidneys despite a fall in IGF-I mRNA level, IGF-I peptide concentration was increased more than twofold. This increase in IGF-I could be caused by the increase in kidney IGFBP-1 gene and protein expression and the decrease in kidney IGF-I degrading activity noted in K deficiency. Treatment with IGF-I failed to induce body or muscle growth, but induced a further increase in kidney size and enlargement of the spleen. Thus, in K deficiency the spontaneous increase in IGF-I levels in the kidney that is IGF-I sensitive may well be a cause of the renal hypertrophy.
DOI: 10.1210/edrv-16-1-3
发表时间: 1995-02
期刊: Endocrine reviews
影响因子: 20.3
作者:
John I. Jones;D. Clemmons
通讯作者: John I. Jones;D. Clemmons
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DOI: 10.1681/asn.v651511
发表时间: 1995
期刊: Journal of the American Society of Nephrology : JASN
影响因子: --
作者:
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发表时间: 1992
期刊: Endocrinology
影响因子: 4.8
作者:
Young,SC;Miles,MV;Clemmons,DR
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DOI: 10.1038/ki.1995.230
发表时间: 1995
影响因子: 19.6
作者:
Tsao,T;Wang,J;Fervenza,FC;Vu,TH;Jin,IH;Hoffman,AR;Rabkin,R
通讯作者: Rabkin,R
蛋白质限制大鼠中 125I 标记的 IGF-I 的血清清除率和降解增加。
DOI: 10.1152/ajpendo.1992.262.4.e406
发表时间: 1992
期刊: The American journal of physiology
影响因子: --
作者:
Thissen,JP;Davenport,ML;Pucilowska,JB;Miles,MV;Underwood,LE
通讯作者: Underwood,LE