机构地区:[1]复旦大学公共卫生学院营养与食品卫生学教研室,上海200032
出 处:《中华预防医学杂志》2010年第1期34-38,共5页Chinese Journal of Preventive Medicine
摘 要:目的探讨番茄红素(lyeopene,LP)对大鼠大脑中动脉栓塞(middl ecerebral artery occlusion,MCAO)所致氧化应激及缺氧损伤的作用及可能机制。方法48只雄性SD大鼠按体重分层分为A组(20mg/kgLP)、B组(5mg/kgLP)、C组(色拉油)、D组(色拉油)及E组(正常饮食)。灌胃15d后,对A、B、C组大鼠制备MCAO模型,D组行假手术对照。再灌注24h后测定脑皮质活性氧(reactive oxygen species,ROS)、一氧化氮(NO)、一氧化氮合成酶(NOS)、乳酸(LD)的含量及活性;并采用逆转录-PCR(RT-PCR)法检测大鼠大脑海马组织缺氧诱导因子-1α(hypoxia—inducible factor-1α,HIF-1α)mRNA、Bcl-2mRNA的表达水平。结果A、B、C、D、E各组大鼠脑ROS水平分别为(114.23±18.91)、(135.89±14.17)、(171.37±25.76)、(94.24±2.23)、(92.06±5.59)荧光强度值/g蛋白(F=9.038,P〈0.01);NO水平分别为(6.60±0.77)、(7.13±0.47)、(8.38±0.80)、(5.52±0.16)、(5.23±0.51)μmol/g蛋白(F=10.197,P〈0.01);NOS水平分别为(0.817±0.016)、(0.875±0.095)、(1.030±0.101)、(0.557±0.094)、(0.595±0.066)U/mg蛋白(F=14.555,P〈0.01);LD水平分别为(0.381±0.069)、(0.446±0.012)、(0.576±0.059)、(0.359±0.021)、(0.310±0.036)mmol/g蛋白(F=10.043,P〈0.01);各组HIF-1α mRNA表达水平分别为0.865±0.274、0.635±0.069、0.491±0.067、0.375±0.052、0.361±0.087(F=40.520,P〈0.01);海马Bel-2mRNA表达水平分别为0.263±0.033、0.330±0.028、0.198±0.034、0.304±0.039、0.236±0.025(F:11.003,P〈0.01)。结论LP对MCAO大鼠脑组织的保护作用可能与其减少缺血再灌注后ROS和LD的蓄积、减轻炎症反应、上调HIF-1α mRNA、Bcl-2 mRNA的表达水平有关。Objective To study the protective effects of lycopene (LP) on cerebral ischemia- reperfusion injury induced by focal cerebral ischemia and oxidative stress in rats. Methods 48 male Sprague-Dawley (SD) rats were randomly assigned into five groups : A (20 mg/kg LP) , B ( 5 mg/kg LP) , C (salad oil) , D (salad oil )and E (basic feed control ). A, B and C groups were given LP or salad oil orally for 15 d,theu cerebral ischcmia-reperfusion injury was established by middle cerebral artery occlusion (MCAO) and D group was used as fake surgery control. The contents of reactive oxygen species ( ROS ) , nitric oxide (NO) ,lactic acid(LD) and the activities of nitric oxide synthetase (NOS) in cortex were measured at 24 h after reperfusion. The levels of HIF-1α mRNA and Bel-2 mRNA in hippocampi were determined by using reverse transcription polymerase chain reaction (RT- PCR) technique. Results ROS levels of A, B, C, D andEgroups were (114.23 ± 18.91),(135.89 ±14.17),(171.37 ±25.76),(94.24±2.23) and (92. 06 ± 5.59 ) fluorescence intensity value/g protein, respectively ( F = 9. 038, P 〈 0. 01 ) ; levels of NO were ( 6. 60 ± 0. 77 ), ( 7.13 ± 0. 47 ), ( 8.38 ± 0. 80 ), ( 5.52 ± 0. 16 ) and ( 5.23 ± 0. 51 ) μmol/g protein respectively ( F = 10. 197, P 〈 0.01 ) ; levels of NOS were (0. 817 ± 0. 016 ), (0. 875 ± 0. 095 ), ( 1. 030 ± 0. 101 ), (0. 557 ± 0. 094 ) and (0. 595 ± 0. 066 ) U/mg protein respectively ( F = 14. 555, P 〈 0.01 ) ; levels of LD were (0.381 ± 0.069),(0.446 ± 0.012), (0.576 ±0.059), (0.359 ±0.021) and (0. 310 ±0. 036) mmol/g protein respectively ( F = 10. 043 ,P 〈0. 01 ) ; HIF-1α mRNA expression levels in hippocampi were 0. 865 ± 0. 274,0. 635 ± 0. 069,0. 491 ± 0. 067,0. 375 ± 0. 052 and 0. 361 ± 0. 087, respectively ( F = 40. 520, P 〈 0. 01 ) ; and Bcl-2 mRNA expression levels in hippocampi were 0. 263 ± 0. 033,0. 330 �
关 键 词:番茄红素 活性氧 大鼠 Sprague—Dawley 大脑中动脉栓塞
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