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Toll样受体-2、核因子-κB在Aβ诱导的阿尔茨海默病中的作用 被引量:2

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摘要 目的探讨Toll样受体2(TLR-2)、核因子-κB(NF-κB)、肿瘤坏死因子(TNF)-α、白细胞介素(IL)-1β与β淀粉样蛋白(Aβ)诱导的阿尔茨海默病(AD)中的作用。方法将雄性Wistar大鼠50只,随机分为A、B、C、D、E组,每组10只;A组大鼠双侧海马CA1区注射5μl生理盐水,B^E组双侧海马注射5μl Aβ(分别含Aβ25~350.5、1、5、10μg);ELISA检测TNF-α、IL-1β含量;免疫组化(IHC)检测海马CA1区TLR-2表达;实时荧光定量PCR技术(qRT-PCR)检测TLR-2、NF-κB基因的mRNA表达。结果 IHC检测TLR-2主要聚集在Aβ斑块周围,D组(0.036 6±0.007 3)、E组(0.044 8±0.010 8)TLR-2阳性表达明显高于A组(0.018 7±0.005 8)、B组(0.010 0±0.003 4)、C组(0.015 1±0.006 0)(P<0.01);ELISA检测大鼠血清TNF-α含量D组(568.65±44.66)pg/ml、E组(685.06±29.92)pg/ml明显高于A组(426.87±55.91)pg/ml、B组(432.99±28.09)pg/ml、C组(488.14±39.04)pg/ml(P<0.01),IL-1β含量D(104.60±9.32)pg/ml、E组(143.38±17.09)pg/ml明显高于A(49.13±8.46)pg/ml、B(60.89±14.71)pg/ml、C(79.81±9.94)pg/ml三组(P<0.01);qRT-PCR检测大鼠海马组织内TLR-2 mRNA表达D组(2.185 9±0.381 4)、E组(2.977 7±0.390 7)明显高于A组(1.000 0±0.000 0)、B组(1.178 5±0.106 6)、C组(1.463 3±0.127 3)(P<0.01);NF-κB mRNA表达D组(1.747 0±0.125 6)、E组(2.271 9±0.533 2)明显高于A组(1.000 0±0.000 0)、B组(1.274 3±0.165 1)、C组(1.429 1±0.077 7)(P<0.01)。结论随着Aβ剂量不断增加,TLR-2促进小胶质细胞吞噬和清除Aβ的能力不足使Aβ积聚体并激活NF-κB,促进更多的TNF-α、IL-1β释放,最终导致大鼠脑内神经元损伤。
出处 《中国老年学杂志》 CAS CSCD 北大核心 2016年第23期5780-5782,共3页 Chinese Journal of Gerontology
基金 河北省教育厅重点资助课题(No.ZD20131051) 河北省高校重点学科资助项目(No.20130337)
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