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中华口腔医学研究杂志(电子版) ›› 2008, Vol. 02 ›› Issue (01) : 41 -45. doi: 10.3877/cma.j.issn.1674-1366.2008-01-009

基础研究

磨牙缺失对老年大鼠大脑边缘叶胆碱能纤维密度的影响
何宏文1,(), 黄芳1, 朱继红2, 刘宇1, 成家茂2   
  1. 1. 510055 广州,中山大学光华口腔医学院
    2. 510055 广州,中山大学中山医学院
  • 收稿日期:2007-02-15 出版日期:2008-02-01
  • 通信作者: 何宏文
  • 基金资助:
    广东省医学科研基金资助项目(B2005256)

The effect of molar-loss on the density of cholinergic fibers in limbic lobe of aged rats

Hong-wen HE1,(), Fang HUANG1, Ji-hong ZHU1, Yu LIU1, Jia-mao CHENG1   

  1. 1. Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou 510055, China
  • Received:2007-02-15 Published:2008-02-01
  • Corresponding author: Hong-wen HE
引用本文:

何宏文, 黄芳, 朱继红, 刘宇, 成家茂. 磨牙缺失对老年大鼠大脑边缘叶胆碱能纤维密度的影响[J/OL]. 中华口腔医学研究杂志(电子版), 2008, 02(01): 41-45.

Hong-wen HE, Fang HUANG, Ji-hong ZHU, Yu LIU, Jia-mao CHENG. The effect of molar-loss on the density of cholinergic fibers in limbic lobe of aged rats[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2008, 02(01): 41-45.

目的

探讨磨牙缺失对老年大鼠大脑边缘叶皮质胆碱能纤维密度的影响。

方法

选用SD大鼠40 只,分为老年缺牙组、老年对照组(18 个月龄)和青年缺牙组、青年对照组(3 个月龄)。 缺牙组大鼠拔除左侧磨牙,2 个月后大脑定位取材,乙酰胆碱脂酶(AChE)组化染色,光镜下观察海马CA1 区、齿状回、扣带回前区和后区胆碱能纤维密度。

结果

老年拔牙组海马CA1 区辐射层、齿状回分子层AChE 阳性纤维密度明显少于老年对照组(P<0.05);老年拔牙组扣带回后区第Ⅳ层AChE 阳性纤维密度明显少于老年对照组(P<0.01)。

结论

单侧磨牙缺失可加速老年机体边缘叶胆碱能系统退变,这可能是缺牙引起老年性学习记忆减退机制之一。

Objective

To explore the effect of molarless on the density of cholinergic fiber in the limbic lobe of aged rats.

Methods

Forty rats were divided into molar-extraction aged group and control aged group (18 months), molar-extraction young group and control young group (3 months). For molar-extraction groups, the left molars were extracted. 2 months after teeth extraction, AChE-positive fibers within hippocampal area CA1, dentate gyrus, anterior and posterior cingulate gyrus of all experimental animals were quantitatively analyzed.

Results

The density of AChE-positive fibers in radiatum layer of CA1 and molecular layer of dentate gyrus in molars extraction aged groups were significantly lower than those in control aged groups(P<0.05). The density of AChE-positive fibers in inner granular layer of posterior cingulate gyrus in molars extraction aged groups were significantly lower than those in control aged group (P<0.01).

Conclusion

Unilateral loss of molar can accelerate degeneration of cholinergic system in limbic lobe of aged rats. This may be one of the mechanisms of aged learning and memory deficit caused by edentia.

表1 大鼠海马CA1 区辐射层、齿状回分子层AChE阳性纤维密度(±s,交点数/1000 μm2
图1 老年对照组海马CA1 区辐射层AChE 阳性纤维(AChE 组化染色×400)
图2 老年缺牙组海马CA1 区辐射层AChE 阳性纤维(AChE 组化染色×400)
表2 大鼠扣带回前区和后区第Ⅳ层AChE阳性纤维密度(±s,交点数/1000 μm2
图3 老年对照组扣带回后区AChE 阳性纤维(AChE 组化染色×100)
图4 老年对照组扣带回后区Ⅳ层AChE 阳性纤维(AChE 组化染色×200)
图5 老年缺牙组扣带回后区AChE 阳性纤维(AChE 组化染色×100)
图6 老年缺牙组扣带回后区Ⅳ层AChE 阳性纤维(AChE 组化染色×200)
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