Insulin-like growth factors in pygmies. The role of puberty in determining final stature.

Insulin-like growth factors in pygmies. The role of puberty in determining final stature.
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俾格米人的胰岛素样生长因子。

DOI:
10.1056/nejm198704093161503
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发表时间:
1987
期刊:
The New England journal of medicine
影响因子:
--
通讯作者:
Cavalli-Sforza,LL
Cavalli-Sforza,LL
中科院分区:
--
文献类型:
--
作者:
Merimee,TJ;Zapf,J;Hewlett,B;Cavalli-Sforza,LL

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我们测量了侏儒儿童、青少年和成人以及对照组的胰岛素样生长因子(IGF)I和II以及睾酮的血清浓度,以更精确地确定这些因子在控制生长中的作用。我们之前已经证明,侏儒的生长激素水平是正常的。青春期前侏儒儿童和对照组在线性生长或血清IGF I和II浓度方面没有差异。在侏儒青少年中,IGF I的平均(±SEM)血清浓度仅为对照青少年的三分之一,对照青少年在年龄和坦纳发育阶段与侏儒相似(154±22 vs. 435±37 ng/ml; P<0.01)。在女孩中观察到IGF I浓度的类似差异(278±18对570±25 ng/ml; P<0.01)。IGF II和睾酮水平在所有组中均正常。只有在青春期,对照组和俾格米人之间的生长有显着差异。在青春期,对照组的生长速度明显加快,而俾格米人的生长速度则不加快或变慢,这些发现表明,成年俾格米人的矮小主要是由于青春期生长速度没有加快。我们假设IGF I是正常青春期生长的主要因素,在IGF I水平没有增加的情况下,睾酮不会明显加速生长。(N Engl J Med 1987;316:906-11.)
We measured the serum concentrations of insulin-like growth factors (IGF) I and II and testosterone in pygmy children, adolescents, and adults, as well as in controls, to determine more precisely the role of these factors in controlling growth. We had previously shown that growth hormone levels were normal in pygmies. Prepubertal pygmy children and controls did not differ in linear growth or in serum concentrations of IGF I and II. In pygmy adolescent boys, the mean (±SEM) serum concentration of IGF I was only one third that in control adolescents, who were similar to the pygmies in age and Tanner stage of development (154±22 vs. 435±37 ng per milliliter; P<0.01). A similar difference in IGF I concentration was observed in girls (278±18 vs. 570±25 ng per milliliter; P<0.01). IGF II and testosterone levels were normal in all groups. There was a significant difference in growth between controls and pygmies only during puberty. There was a marked acceleration of growth in the controls during adolescence, but such an acceleration was absent or blunted in the pygmies.These findings suggest that the short stature of adult pygmies is due primarily to a failure of growth to accelerate during puberty. We postulate that IGF I is the principal factor responsible for normal pubertal growth and that testosterone does not accelerate growth appreciably in the absence of an increase in the level of IGF I. (N Engl J Med 1987;316:906–11.)
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