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- 2018
Caveolin-1基因敲除小鼠下颌第一磨牙的表型观察
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Abstract:
摘要 目的:观察Caveolin-1基因敲除小鼠(knockout,KO)下颌第一磨牙牙胚组织学形态及牙齿表型,为深入研究Caveolin-1在牙齿发育中的作用提供组织学基础。方法:经聚合酶链式反应(polymerase chain reaction,PCR)鉴定基因型后,HE染色观察不同发育阶段的KO小鼠及同源野生型(wildtype,WT)小鼠的下颌第一磨牙牙胚组织学形态;显微CT观察其牙体硬组织结构。结果:胚胎14.5 d,WT鼠牙胚发育进入帽状期,但KO鼠牙胚仍处于蕾状期,成釉器未见明显分层及原发性釉结形成。胚胎16.5 d,KO鼠成釉器出现细胞分层,但成釉器体积较小,颈环处上皮芽向下方间充质中深入较浅。胚胎18.5 d, KO鼠成釉细胞和成牙本质细胞的细胞极化不明显,且成牙本质细胞缺乏典型柱状形态。出生后1个月,下颌第一磨牙显微CT及三维重建结果显示:KO鼠与WT鼠牙体解剖形态未见明显差异。结论:Caveolin-1基因表达缺失可导致小鼠下颌第一磨牙牙胚发育蕾状期-帽状期过渡出现暂时性滞后,但对牙齿后期发育无明显影响
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