Separate and distinctive roles for Wnt5a in tongue, lingual tissue and taste papilla development

被引:23
|
作者
Liu, Hong-Xiang [1 ]
Grosse, Ann S. [2 ]
Iwatsuki, Ken [3 ]
Mishina, Yuji [1 ]
Gumucio, Deborah L. [2 ]
Mistretta, Charlotte M. [1 ]
机构
[1] Univ Michigan, Sch Dent, Dept Biol & Mat Sci, Ann Arbor, MI 48109 USA
[2] Univ Michigan, Sch Med, Dept Cell & Dev Biol, Ann Arbor, MI 48109 USA
[3] Ajinomoto Co Inc, Inst Innovat, Kawasaki, Kanagawa, Japan
关键词
Fungiform papilla; Tongue; Wnt; Shh; Papilla placode; Non-canonical Wnt; RECEPTOR TYROSINE KINASE; EMBRYONIC RAT TONGUE; PLANAR CELL POLARITY; HAIR FOLLICLE; SIGNALING PATHWAY; SONIC HEDGEHOG; STEM-CELLS; MORPHOGENETIC PROTEINS; FUNGIFORM PAPILLAE; PALATE DEVELOPMENT;
D O I
10.1016/j.ydbio.2011.10.009
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Although canonical Wnt signaling is known to regulate taste papilla induction and numbers, roles for non-canonical Wnt pathways in tongue and taste papilla development have not been explored. With mutant mice and whole tongue organ cultures we demonstrate that Wnt5a protein and message are within anterior tongue mesenchyme across embryo stages from the initiation of tongue formation, through papilla placode appearance and taste papilla development. The Wnt5a mutant tongue is severely shortened, with an ankyloglossia, and lingual mesenchyme is disorganized. However, fungiform papilla morphology, number and innervation are preserved, as is expression of the papilla marker, Shh. These data demonstrate that the genetic regulation for tongue size and shape can be separated from that directing lingual papilla development. Preserved number of papillae in a shortened tongue results in an increased density of fungiform papillae in the mutant tongues. In tongue organ cultures, exogenous Wnt5a profoundly suppresses papilla formation and simultaneously decreases canonical Writ signaling as measured by the TOPGAL reporter. These findings suggest that Wnt5a antagonizes canonical Wnt signaling to dictate papilla number and spacing. In all, distinctive roles for Wnt5a in tongue size, fungiform papilla patterning and development are shown and a necessary balance between non-canonical and canonical Wnt paths in regulating tongue growth and fungiform papillae is proposed in a model, through the Ror2 receptor. (C) 2011 Elsevier Inc. All rights reserved.
引用
收藏
页码:39 / 56
页数:18
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