Abstract:

Objective: To investigate the spatial and temporal distribution of p21 senescent cells in periodontal tissue and femur of diabetic mice. Methods: We constructed transgenic mice capable of tracing p21 senescent cells, used gel electrophoresis assay to screen 24 homozygous mice, and randomly divided them into control group and diabetic group, with 12 mice in each one. The control group was given a normal diet, while the diabetic group was given a high fat diet for 4 weeks, followed by streptozocin (STZ) injection to induce the diabetic model. Periodontal tissue samples were collected from mice at 4, 8, 12, and 16 weeks respectively. We used the tracer function of p21-3MR mice and real-time quantitative polymerase chain reaction (RT-qPCR) to investigate the spatial and temporal expression changes of p21 senescent cells and periodontal changes in inflammation levels. Results: The expression levels of p21 increase over time during the progression of diabetes, and the distribution of p21 senescent cells gradually extends from the gingiva towards the alveolar bone. Conclusion: p21 senescent cells are involved in the progression of diabetes and may play a role in the regulation of bone homeostasiss by secretion of senescence-associated secretory phenotype (SASP) factors, but their specific mechanisms require further investigation.

Key words: cellular senescence, p21, diabetic periodontitis

摘要：

目的：探究p21衰老细胞在糖尿病小鼠牙周组织中的时空分布。方法：构建能够示踪p21衰老细胞的p21-3MR转基因小鼠，并通过凝胶电泳实验筛选24只纯合子小鼠，将其随机均分为2组。糖尿病组利用高糖、高脂饮食结合链脲佐菌素（streptozocin，STZ）注射构建糖尿病模型，对照组给予正常饮食。收取注射后第4、8、12和16周小鼠的牙周组织样本，利用p21-3MR小鼠的示踪功能，结合实时定量聚合酶链反应（real time-quantitative polymerase chain reaction，RT-qPCR）探究衰老标记p21、p16在糖尿病小鼠牙周组织中的时空表达变化和炎症水平变化。结果：p21表达水平在糖尿病进程中随时间延长而升高，p21衰老细胞的分布由牙龈逐渐扩散至牙槽骨内。结论：p21衰老细胞参与糖尿病进程，可能通过分泌衰老相关分泌表型（senescence-associated secretory phenotype，SASP）因子参与骨稳态的调控，但其具体机制有待进一步研究。

关键词: 细胞衰老, p21, 糖尿病牙周炎

CLC Number: 

• R782