Distinct functions for netrin 1 in chicken and murine semicircular canal morphogenesis.
Development
; 144(18): 3349-3360, 2017 09 15.
Article
em En
| MEDLINE
| ID: mdl-28851705
ABSTRACT
The vestibular system of the inner ear detects head position using three orthogonally oriented semicircular canals; even slight changes in their shape and orientation can cause debilitating behavioral defects. During development, the canals are sculpted from pouches that protrude from the otic vesicle, the embryonic anlage of the inner ear. In the center of each pouch, a fusion plate forms where cells lose their epithelial morphology and the basement membrane breaks down. Cells in the fusing epithelia intercalate and are removed, creating a canal. In mice, fusion depends on the secreted protein netrin 1 (Ntn1), which is necessary for basement membrane breakdown, although the underlying molecular mechanism is unknown. Using gain-of-function approaches, we found that overexpression of Ntn1 in the chick otic vesicle prevented canal fusion by inhibiting apoptosis. In contrast, ectopic expression of the same chicken Ntn1 in the mouse otic vesicle, where apoptosis is less prominent, resulted in canal truncation. These findings highlight the importance of apoptosis for tissue morphogenesis and suggest that Ntn1 may play divergent cellular roles despite its conserved expression during canal morphogenesis in chicken and mouse.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Canais Semicirculares
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Proteínas Supressoras de Tumor
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Morfogênese
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Fatores de Crescimento Neural
Limite:
Animals
Idioma:
En
Revista:
Development
Assunto da revista:
BIOLOGIA
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EMBRIOLOGIA
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Estados Unidos