Indian hedgehog roles in post-natal TMJ development and organization.

Indian hedgehog roles in post-natal TMJ development and organization.
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DOI:
10.1177/0022034510363078
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发表时间:
2010-04
影响因子:
7.6
通讯作者:
Koyama E
Koyama E
中科院分区:
医学1区
文献类型:
--
作者:
Ochiai T;Shibukawa Y;Nagayama M;Mundy C;Yasuda T;Okabe T;Shimono K;Kanyama M;Hasegawa H;Maeda Y;Lanske B;Pacifici M;Koyama E

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印度刺猬 (Ihh) 对于胚胎下颌髁突生长和椎间盘原基形成至关重要。为了确定它是否在产后生活中调节这些过程,我们在新生小​​鼠的软骨中消融了 Ihh,并评估了其对颞下颌关节 (TMJ) 生长和组织随年龄增长的影响。 Ihh 缺乏导致髁突紊乱和生长迟缓,并减少多态细胞层增殖。 Sox9、Runx2 和 Osterix 的表达较低,II 型胶原、I 型胶原和聚集蛋白聚糖的表达也较低,从而改变了髁突的纤维软骨性质。虽然椎间盘形成,但它表现出形态缺陷、与关节盂骨表面部分融合、滑膜腔空间减少以及出乎意料地更高的润滑素表达。数据分析首次表明,完成产后颞下颌关节的生长和组织需要持续的 Ihh 动作。突变体中润滑素的过度表达可能代表维持颞下颌关节运动和功能的补偿反应。
Indian hedgehog (Ihh) is essential for embryonic mandibular condylar growth and disc primordium formation. To determine whether it regulates those processes during post-natal life, we ablated Ihh in cartilage of neonatal mice and assessed the consequences on temporomandibular joint (TMJ) growth and organization over age. Ihh deficiency caused condylar disorganization and growth retardation and reduced polymorphic cell layer proliferation. Expression of Sox9, Runx2, and Osterix was low, as was that of collagen II, collagen I, and aggrecan, thus altering the fibrocartilaginous nature of the condyle. Though a disc formed, it exhibited morphological defects, partial fusion with the glenoid bone surface, reduced synovial cavity space, and, unexpectedly, higher lubricin expression. Analysis of the data shows, for the first time, that continuous Ihh action is required for completion of post-natal TMJ growth and organization. Lubricin overexpression in mutants may represent a compensatory response to sustain TMJ movement and function.
DOI: 10.1101/gad.1017802
发表时间: 2002-11-01
影响因子: 10.5
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