Bone abnormalities in latent TGF-[beta] binding protein (Ltbp)-3-null mice indicate a role for Ltbp-3 in modulating TGF-[beta] bioavailability.

Bone abnormalities in latent TGF-[beta] binding protein (Ltbp)-3-null mice indicate a role for Ltbp-3 in modulating TGF-[beta] bioavailability.
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潜在TGF-β结合蛋白(Ltbp)-3缺失小鼠的骨异常表明Ltbp-3在调节TGF-β生物利用度中的作用。

DOI:
10.1083/jcb.200111080
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发表时间:
2002-01-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Rifkin DB
Rifkin DB
中科院分区:
其他
文献类型:
--
作者:
Dabovic B;Chen Y;Colarossi C;Obata H;Zambuto L;Perle MA;Rifkin DB

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TGF-βs是一种多功能蛋白,其活性被认为是通过与潜在的TGF-β结合蛋白(ltbp)相互作用来控制的。尽管付出了巨大的努力,但这种相互作用在体内的确切意义仍然未知。为了研究Ltbp-3的作用,我们通过基因靶向在小鼠中制造了Ltbp-3缺失突变。纯合子突变动物在第10天出现颅面畸形。2个月时,颅穹窿明显变圆,下颌骨延伸到上颌骨之外,并出现后凸。没有动物头骨的组织学检查显示在出生后2周内软骨联合骨化,而野生型软骨联合骨化从未发生。在6到9个月之间,突变动物也会发生骨硬化和骨关节炎。ltbp -3缺失小鼠的病理变化与颅骨和长骨中TGF-β信号的紊乱一致。这些观察结果支持了LTBP-3在控制TGF-β作用中起重要作用的观点。此外,该结果首次提供了LTBP在调节TGF-β生物利用度中的体内适应症。
The TGF-βs are multifunctional proteins whose activities are believed to be controlled by interaction with the latent TGF-β binding proteins (LTBPs). In spite of substantial effort, the precise in vivo significance of this interaction remains unknown. To examine the role of the Ltbp-3, we made an Ltbp-3–null mutation in the mouse by gene targeting. Homozygous mutant animals develop cranio-facial malformations by day 10. At 2 mo, there is a pronounced rounding of the cranial vault, extension of the mandible beyond the maxilla, and kyphosis. Histological examination of the skulls from null animals revealed ossification of the synchondroses within 2 wk of birth, in contrast to the wild-type synchondroses, which never ossify. Between 6 and 9 mo of age, mutant animals also develop osteosclerosis and osteoarthritis. The pathological changes of the Ltbp-3–null mice are consistent with perturbed TGF-β signaling in the skull and long bones. These observations give support to the notion that LTBP-3 is important for the control of TGF-β action. Moreover, the results provide the first in vivo indication for a role of LTBP in modulating TGF-β bioavailability.
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