甲状腺激素对成年大鼠海马内突触结合蛋白I表达的影响  被引量:1

Effect of thyroid hormone level on the expression of synaptotagmin I in adult rat hippocampus

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作  者:朱宁宁[1] 贾雪梅[2] 刘春蕾[1] 何景周[1] 徐永霞[1] 朱德发[1] 

机构地区:[1]安徽医科大学第一附属医院老年内分泌科,合肥230022 [2]安徽医科大学第一附属医院基础医学院综合实验室,合肥230022

出  处:《中国地方病学杂志》2009年第3期255-258,共4页Chinese Jouranl of Endemiology

基  金:基金项目:国家自然科学基金(30772301);安徽省自然科学基金(070413084)

摘  要:目的观察不同甲状腺激素水平对大鼠海马突触结合蛋白I(SytI)蛋白表达水平的影响。方法复制雄性SD大鼠成年期甲状腺功能减退症(甲减)、甲状腺功能亢进症(甲亢)模型,用放射免疫法测定血清甲状腺激素L、T4水平,用免疫组织化学超敏链霉菌抗生物素蛋白-过氧化物酶连结(S—P)法分析海马CA1区、CA3区和齿状回(DG)SytI蛋白的表达。结果甲减组大鼠血清L、T4水平[(0.34±0.12)、(41.03±11.37)nmol/L]明显低于对照组[(0.65±0.15)、(55.20±10.68)nmol/L,P〈0.01或〈0.05];甲减组SytI免疫反应产物阳性颗粒较对照组也明显减少,尤以海马CA1、CA3区锥体细胞层、放射层及DG区颗粒细胞层减少明显.SytI免疫反应产物,甲减组海马CA。区多形层(0.048±0.007)、细胞层(0.299±0.035)、放射层(0.042±0.007)、腔隙分子层(0.038±0.006)和CA3区的细胞层(0.085±0.019)、放射层(0.040±0.011)、腔隙分子层(0.038±0.006)及DG区颗粒细胞层(0.076±0.019)均较对照组(0.068±0.014、0.376±0.053、0.053±0.008、0.056±0.009,0.118±0.026、0.052±0.010、0.053±0.009、0.099±0.015)明显减少(P〈0.01或〈0.05)。甲亢组大鼠血清L、T4水平[(1.43±0.30)、(157.18±19.95)nmol/L]明显高于对照组(P〈0.01)。CA1区细胞层(0.322±0.050)、放射层(0.039±0.006)、腔隙分子层(0.042±0.006)和CA3区细胞层(0.098±0.034)、放射层(0.046±0.013)、腔隙分子层(0.046±0.010)及DC区颗粒层(0.085±0.024)、分子层(0.042±0.009)SytI免疫反应产物也较对照组减少(P〈0.05或〈0.01)。结论甲状腺激素水平增高或降低均可导致成年大鼠海马内SytI蛋白表达减少。Objective To observe the effect of different thyroid hormone level on the expression of synaptotagtnin I ( Syt I ) in adult rat hippocampus. Methods All 28 adult male SD rats were assigned randomly into hypothyroid, hyperthyroid and control group, hypothyroid group was established by daily intraperitoneal injections with propyhhiou raci(PTU, 10.0 mg/kg body weight) for 6 weeks and hyperthyroid group with L-Thyroxine (L-T4, 0.5 mg/kg body weight) for 3 weeks. Radioimmunity method was used to assay the levels of serum T3 and T4, immunohistochemical S-P technology to assay the levels of Syt 1 protein in hippocampus CA1, CA3 and dentate gyrus (DG). The layers analyzed in the different subfields include the polymorphic cell layer(the stratum oriens, SO), pyramidal cell layer(PCL), stratum radiatum (SR), lacunosum-molecular layer (SLM) in CA1 and CA3, granular cell layer(GL) and molecular layer(ML) in DG. Results The levels of serum T3 and T4[ (0.34 ± 0.12), (41.03 ± 11.37)nmol/L] in the hypothyroid rats were significantly lower than those in the control group[(0.65 ± 0.15), (55.20 ± 10.68)nmol/L, P 〈 0.01 or 〈 0.05], and the positive granule of Syt I was significantly lower in PCL and SR of CA1 and CA3, GL of DG. The average optical value responsible for Syt I immunoreactivity was obviously reduced in SO (0.048 ± 0.007), PCL(0.299 ± 0.035), SR(0.042 ± 0.007), SLM(0.038 ± 0.006) of CA1, PCL(0.085 ±0.019), SR(0.040 ± 0.011), SLM (0.038 ± 0.006) of CA3, GL (0.076 ± 0.019) of DG than normal controls (0.068 ± 0.014, 0.376±0.053, 0.053 ± 0.008,0.056± 0.009,0.118 ± 0.026,0.052 ± 0.010,0.053 ± 0.009,0.099 ± 0.015; P 〈 0.01 or 〈 0.05). Serum T3 and T4 levels[ (1.43 ± 0.30), (157.18 ± 19.95)nmol/L] of hyperthyroid rats were significantly higher than those of control group(P 〈 0.01 ). The value was reduced in PCL(0.322 ± 0.050), SR(0.039 ± 0.006), SLM (0.042 ± 0.006) of CA1, PCL�

关 键 词:甲状腺激素类 甲状腺功能减退症 甲状腺功能亢进症 突触结合蛋白I 海马 

分 类 号:R686[医药卫生—骨科学]

 

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