Publication date: October 2017
Source:Archives of Oral Biology, Volume 82
Author(s): Ning Dong, Yan Liu, Tiantian Zhang, Lin Zhao, Jiangang Tian, Jianping Ruan
ObjectiveThe RNA-binding proteins Lin28 and Lin28b are expressed in many developing tissues and are involved in the biosynthesis of the microRNA let-7 family and embryogenesis processes. However, their roles in mammalian tooth development remain ill-defined.DesignThe spatiotemporal expressions of Lin28 and Lin28b during mouse molar odontogenesis from day E11.5 to P21 were examined through immunohistochemistry and western blot analysis.ResultsBoth Lin28 and Lin28b were initially expressed in dental epithelium, but the expression patterns varied thereafter. Lin28 was expressed in tooth germ from early embryonic stages and was consistently expressed in the ameloblasts and odontoblasts throughout all stages of tooth development. However, positive staining of Lin28b gradually faded out with tooth germ development, before finally disappearing in tooth organ cells after birth.ConclusionsThese results indicate that Lin28 was spatiotemporally expressed in tooth germ throughout tooth development progression and may play an active role in ameloblast and odontoblast differentiation, as well as matrix secretion and the mineralization of enamel and dentin. Its paralogue Lin28b may have a distinct function in tooth germ formation.
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