机构地区:[1]哈尔滨医科大学中国疾病预防控制中心地方病控制中心碘缺乏病防治研究所,150081
出 处:《中国地方病学杂志》2009年第3期259-262,共4页Chinese Jouranl of Endemiology
基 金:基金项目:黑龙江省自然科学基金(D0315)
摘 要:目的观察维生素A对碘过量小鼠甲状腺细胞凋亡相关基因表达的影响。方法将昆明种小鼠按体质量随机分成6组:对照(NI)组、高碘(HI)组、低维生素A(EVA)组、高碘低维生素A(HI+LVA)组、高碘补维生素A1(HI+VA1)组、高碘补维生素A2(HI+VA2)组。各组小鼠饲以合成饲料(维生素A分别为4000、4000、0、0、8000、16000U/kg).并饮用含不同剂量碘酸钾的去离子水(含碘量分别为50、3000、50、3000、3000、3000μg/L)。分别在实验3、6个月时,采用原位末端标记(TUNEL)法检测甲状腺细胞凋亡水平,反转录-聚合酶链反应(RT—PCR)法检测甲状腺细胞凋亡相关基因Fas、FasL、Bcl-2mRNA表达水平。结果甲状腺细胞凋亡指数随着月龄的增长呈逐渐上升的趋势。3个月时,HI组[(20.91±9.57)%]、HI+LVA组[(20.29±9.90)%]、HI+VA2组[(19.51±8.25)%]均明显高于NI组[(14.09±5.68)%,P均〈0.05];6个月时,HI组[(23.22±8.58)%]、LVA组[(22.56±6.17)%]、HI+LVA组[(25.99±9.62)%]、HI+VA1组[(21.65±7.74)%]均明显高于NI组[(16.80±9.90)%,P均〈0.05]。3、6个月时HI组Fas、FasLmRNA表达(Fas:1.57±0.36、1.49±0.35,FasL:1.85±0.46、1.84±0.32)与NI组(Fas:1.29±0.25、1.27±0.26,FasL:1.60±0.13、1.65±0.13)比较有增高趋势,但差异无统计学意义(P均〉0.05);6个月时,HI+VA1、HI+VA2组FasmRNA表达(1.33±0.35、1.30±0.26)与HI组比较有降低趋势,与NI组比较差异无统计学意义(P均〉0.05);3、6个月时,HI+LVA组Fas、FasLmRNA表达(Fas:1.60±0.27、1.67±0.32,FasL:1.88±0.46、2.10±0.34)与HI组比较,差异均无统计学意义(P均〉0.05)。上述各组Bcl-2mRNA表达水平3个月时分别为1.05±0.19、0.96±0.33、0.95±0.26、1.18±0.2Objective To explore the effects of different vitamin A(VA) levels on thyroid cells apoptosis and its gene expression of mice taking excessive iodine. Methods Kunming mice were randomly divided into 6 groups according to body weight 3 weeks after born: normal control(M) group, high iodine(HI) group, low vitamin (LVA) group, high iodine plus low vitamin A (HI ± LVA) group, high iodine plus vitamin A1 (HI ± VA1 ) group, high iodine plus vitamin A2(HI ± VA2) group. The VA was given in food(4000,4000,0,0,8000,16 000 U/kg), and the iodine was given as potassium iodate in water (1: 50,3000,50,3000,3000,3000 μg/L). The apoptosis was tested using in situ end labeling(TUNEL) method. Reverse transcription polymerase chain reaction(RT-PCR) were used to measure the level of mRNA of apoptosis gene(Fas, FasL, Bcl-2) in tissues. Results Apoptotic index measured by TUNEL method was rising along with the mice age. Compared to NI group[ (14.09 ± 5.68)%],apoptotic index was significantly increased in HI[ (20.91 ± 9.57)%], HI ± LVA[ (20.29 ± 9.90)%] and HI ± VA2 [ (19.51 ± 8.25 )% ] groups in the three months (P 〈 0.05 ). Compared to NI group [ ( 16.80 ± 9.90)% ], apoptotic index was significantly increased(P 〈 0.05) in HI[ (23.22 ± 8.58)%] ,LVA[ (22.56 ± 6.17)%] ,HI ± LVA [ (25.99 ± 9.62)% ],HI ± VA1 [ (21.65 ± 7.74)% ] groups in the six months. Compared with the NI group (Fas: 1.29 ± 0.25,1.27 ± 0.26; FasL: 1.60 ±0.13,1.65 ± 0.13 ), the mRNA levels of Fas and FasL in HI group (F as: 1.57 ± 0.36,1.49 ± 0.35; FasL: 1.85 ± 0.46,1.84 ± 0.32) were increased, but the differences were not remarkable(P 〉 0.05 ) in the three and six months. Compared with the HI group, the mRNA levels of Fas in HI ± VA1, HI ± VA2( 1.33 ± 0.35,1.30 ± 0.26) groups were decreased to the level in NI group in the six months. The mRNA levels of Fas and FasL were not different (P 〉 0.05 ) between HI ± LVA
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