Autophagy Plays a Crucial Role in Ameloblast Differentiation.

Autophagy Plays a Crucial Role in Ameloblast Differentiation.
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DOI:
10.1177/00220345231169220
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发表时间:
2023-08
影响因子:
7.6
通讯作者:
--
中科院分区:
医学1区
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--
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牙釉质是由成釉细胞产生的。釉质发生的任何失败都会导致釉质的缺陷,这种情况被称为釉质发生不全。在这里,我们报告了上皮源性组织中自噬缺陷的小鼠(K14-Cre;ATG7F/F和K14-Cre;Atg3F/F条件性基因敲除小鼠)表现出成釉发育不全。微型计算机断层成像证实,这些小鼠牙齿中的釉质密度和厚度显著减少。在分子水平上,自噬的特异性底物NRF2的异位积累和激活影响了成釉细胞的分化。通过生物信息学分析,我们确定Bcl11b、DLX3、Klk4、Ltbp3、Nectin1和Pax9是与成釉发育不全和NRF2介导的途径相关的候选基因。为了研究自噬缺陷引起的异位NRF2途径激活的影响,我们分析了靶基因的表达和NRF2与候选靶基因启动子区域的结合,发现Bcl11b、DLX3、Klk4和Nectin1的基因表达受到抑制,而Ltbp3和Pax9的基因表达没有受到抑制。综上所述,我们的研究结果表明,自噬在成釉细胞分化中起着至关重要的作用,它的失败通过异位激活NRF2导致成釉细胞发育不全。
Tooth enamel is generated by ameloblasts. Any failure in amelogenesis results in defects in the enamel, a condition known as amelogenesis imperfecta. Here, we report that mice with deficient autophagy in epithelial-derived tissues (K14-Cre;Atg7 F/F and K14-Cre;Atg3 F/F conditional knockout mice) exhibit amelogenesis imperfecta. Micro–computed tomography imaging confirmed that enamel density and thickness were significantly reduced in the teeth of these mice. At the molecular level, ameloblast differentiation was compromised through ectopic accumulation and activation of NRF2, a specific substrate of autophagy. Through bioinformatic analyses, we identified Bcl11b, Dlx3, Klk4, Ltbp3, Nectin1, and Pax9 as candidate genes related to amelogenesis imperfecta and the NRF2-mediated pathway. To investigate the effects of the ectopic NRF2 pathway activation caused by the autophagy deficiency, we analyzed target gene expression and NRF2 binding to the promoter region of candidate target genes and found suppressed gene expression of Bcl11b, Dlx3, Klk4, and Nectin1 but not of Ltbp3 and Pax9. Taken together, our findings indicate that autophagy plays a crucial role in ameloblast differentiation and that its failure results in amelogenesis imperfecta through ectopic NRF2 activation.
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