The chiton stylus canal: An element delivery pathway for tooth cusp biomineralization
The chiton stylus canal: An element delivery pathway for tooth cusp biomineralization
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DOI：
10.1002/jmor.10705
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发表时间：
2009-05
影响因子：
1.5
通讯作者：
J. Shaw;D. Macey;L. Brooker;E. Stockdale;M. Saunders;P. Clode
中科院分区：
文献类型：
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作者：
J. Shaw;D. Macey;L. Brooker;E. Stockdale;M. Saunders;P. Clode
对石鳖Acanthopleura hirtosa铁矿化主要侧齿内的触针管进行了详细调查，并对尖点矿化进行了逐行检查。显示运河包含柱状上皮组织类似于周围的矿化尖，包括存在的富铁颗粒的特征性的铁储存蛋白铁蛋白。在牙芯内，在尖突的连接区和矿化后表面之间的触针管上方，有一个先前未描述的内部通道或羽状物。羽状物的形成与上级上皮中的铁的出现和齿排13处的矿化的开始相一致。在将磷和钙输送到牙芯中的过程中，羽状物持续存在，并且是牙尖矿化的最后区域。在另外18种石鳖中证实了触针管的存在，揭示了该管是polyplacophoran软体动物所共有的。这些新的数据有力地支持了越来越多的证据，强调了石鳖牙齿中牙齿矿化的连接区的重要性，并表明牙齿尖内的化学和结构环境受到比以前认为的更大的生物控制。J. Morphol. 2009.© 2008 Wiley利斯公司
A detailed investigation of the stylus canal situated within the iron mineralized major lateral teeth of the chiton Acanthopleura hirtosa was undertaken in conjunction with a row‐by‐row examination of cusp mineralization. The canal is shown to contain columnar epithelial tissue similar to that surrounding the mineralized cusps, including the presence of iron rich particles characteristic of the iron storage protein ferritin. Within the tooth core, a previously undescribed internal pathway or plume is evident above the stylus canal, between the junction zone and mineralizing posterior face of the cusp. Plume formation coincides with the appearance of iron in the superior epithelium and the onset of mineralization at tooth row 13. The plume persists during the delivery of phosphorous and calcium into the tooth core, and is the final region of the cusp to become mineralized. The presence of the stylus canal was confirmed in a further 18 chiton species, revealing that the canal is common to polyplacophoran molluscs. These new data strongly support the growing body of evidence highlighting the importance of the junction zone for tooth mineralization in chiton teeth, and indicate that the chemical and structural environment within the tooth cusp is under far greater biological control than previously considered. J. Morphol. 2009. © 2008 Wiley‐Liss, Inc.