Synchrotron radiation-based X-ray tomography reveals life history in primate cementum incrementation
Synchrotron radiation-based X-ray tomography reveals life history in primate cementum incrementation
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DOI：
10.1098/rsif.2020.0538
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发表时间：
2020-11-25
影响因子：
3.9
通讯作者：
Schneider, Philipp
中科院分区：
文献类型：
--
作者：
Newham, Elis;Corfe, Ian J.;Schneider, Philipp
牙骨质是哺乳动物常见的矿化牙齿组织，其在整个生命过程中生长，遵循季节性同位节律。每年，一个厚的半透明的增量和一个薄的不透明的增量被存放，提供了一个动物的生活史几乎完整的记录。雄性和雌性哺乳动物在口腔健康方面表现出显着差异，这是由于雌性与雄性性激素的对比效应。雌激素和孕激素对口腔健康有一系列负面影响，这些影响延伸到牙周组织和牙骨质生长界面。在这里，我们使用同步辐射为基础的X射线断层成像的牙骨质的样本恒河猴（猕猴）牙齿从个人的已知生活史。我们发现，增加繁殖历史的女性对应于增加增量曲折和组织牙骨质结构，相比男性和青少年牙骨质。我们通过测量牙骨质的灰度“纹理”并使用主成分分析比较结果来量化结构差异。成年女性和男性占据纹理空间的离散区域，没有重叠。已知怀孕记录的女性也有显着不同的牙骨质相比，非繁殖和青少年女性。我们的结论是牙骨质结构和纹理的几个方面可能反映了灵长类动物性生活史的差异。
Cementum is a mineralized dental tissue common to mammals that grows throughout life, following a seasonally appositional rhythm. Each year, one thick translucent increment and one thin opaque increment is deposited, offering a near-complete record of an animal's life history. Male and female mammals exhibit significant differences in oral health, due to the contrasting effects of female versus male sex hormones. Oestrogen and progesterone have a range of negative effects on oral health that extends to the periodontium and cementum growth interface. Here, we use synchrotron radiation-based X-ray tomography to image the cementum of a sample of rhesus macaque (Macaca mulatta) teeth from individuals of known life history. We found that increased breeding history in females corresponds with increased increment tortuosity and less organized cementum structure, when compared to male and juvenile cementum. We quantified structural differences by measuring the greyscale 'texture' of cementum and comparing results using principal components analysis. Adult females and males occupy discrete regions of texture space with no overlap. Females with known pregnancy records also have significantly different cementum when compared with non-breeding and juvenile females. We conclude that several aspects of cementum structure and texture may reflect differences in sexual life history in primates.