Role of bone morphogenetic proteins on cochlear hair cell formation: analyses of Noggin and Bmp2 mutant mice.

Role of bone morphogenetic proteins on cochlear hair cell formation: analyses of Noggin and Bmp2 mutant mice.
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DOI:
10.1002/dvdy.22200
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发表时间:
2010-03
期刊:
Developmental dynamics : an official publication of the American Association of Anatomists
影响因子:
--
通讯作者:
Wu DK
Wu DK
中科院分区:
其他
文献类型:
--
作者:
Hwang CH;Guo D;Harris MA;Howard O;Mishina Y;Gan L;Harris SE;Wu DK

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哺乳动物内耳的Corti器官是一个高度复杂的感觉末端器官,负责探测声音。Noggin是一种分泌糖蛋白,可拮抗骨形态发生蛋白2和4 (Bmp2和Bmp4)。这种拮抗剂的缺乏导致Corti器官内、外毛细胞增多。在小鼠中,Bmp2在新生耳蜗毛细胞中短暂表达。为了研究Noggin是否正常调节毛细胞形成的Bmp2水平,我们使用两个cre菌株Foxg1cre/+和Gfi1cre/+在耳蜗毛细胞中删除了Bmp2。用这两种cre菌株产生的Bmp2条件敲除耳蜗显示正常毛细胞。此外,Gfi1cre / +;Bmp2lox/−小鼠存活,听力基本正常。Noggin和Bmp2突变体的综合结果表明,Noggin可能调节耳蜗中的其他bmp,如Bmp4。
The mammalian organ of Corti of the inner ear is a highly sophisticated sensory end organ responsible for detecting sound. Noggin is a secreted glycoprotein, which antagonizes bone morphogenetic proteins 2 and 4 (Bmp2 and Bmp4). The lack of this antagonist causes increased rows of inner and outer hair cells in the organ of Corti. In mice, Bmp2 is expressed transiently in nascent cochlear hair cells. To investigate whether Noggin normally modulates the levels of Bmp2 for hair cell formation, we deleted Bmp2 in the cochlear hair cells using two cre strains, Foxg1cre/+ and Gfi1cre/+. Bmp2 conditional knockout cochleae generated using these two cre strains show normal hair cells. Furthermore, Gfi1cre/+;Bmp2lox/− mice are viable and have largely normal hearing. The combined results of Noggin and Bmp2 mutants suggest that Noggin is likely to regulate other Bmps in the cochlea such as Bmp4.
BMP4对于检测角头运动的前庭设备的形成至关重要。
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