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1、目的:本實驗以Fischer大鼠甲狀腺細(xì)胞系(FRTL)為研究對象,在體外從細(xì)胞和分子水平研究高糖毒性及AGEs對甲狀腺細(xì)胞甲狀腺球蛋白(TG)、甲狀腺過氧化物酶(TPO)mRNA表達(dá)的影響,初步探索除免疫機(jī)制外,糖毒性致甲狀腺組織損傷的機(jī)制。 方法:在體外用D-glucose與BSA共同孵育AGEs-BSA。將體外培養(yǎng)成功的FRTL細(xì)胞分為+TSH組(完全培養(yǎng)基中加TSH)和-TSH組(完全培養(yǎng)基中未加TSH),每組分別給予不
2、同濃度的D-glucose、AGEs及AGEs抗體刺激,在糖刺激組設(shè)置滲透組以排除滲透壓因素對細(xì)胞的影響,于24h、48h、72h分別收集細(xì)胞,使用實時熒光定量PCR測定TG、TPO mRNA的表達(dá)情況。 結(jié)果: ①12周后得到棕褐色產(chǎn)物AGEs-BSA。AGEs-BSA熒光光譜掃描:其激發(fā)波長為360nm,發(fā)射波長為450nm,AGEs-BSA的熒光值高于BSA,其濃度為52.446g/ml。 ②實驗中FRTL
3、細(xì)胞無污染,圓形較亮,成堆生長,密度適中,貼壁良好。 ③實時熒光定量PCR檢測TG、TPOmRNA的表達(dá)水平:在+TSH組與-TSH組:D-glucose刺激組及AGEs刺激組中,每個刺激時間中組間比較均有統(tǒng)計學(xué)意義(P<0.001);且在D-glucose刺激組,對照組與滲透組比較差別無統(tǒng)計學(xué)意義(P>0.05);+TSH組不同濃度D-glucose刺激24h、48h、72h后;15mmol/L組低于對照組、滲透組(TG、TP
4、O:24h:P>0.05;48h:P<0.001;72h:P<0.001);20mmol/L組低于15mmol/L組、對照組、滲透組(TG、TPO:24h:P>0.05、P<0.001;48h:P<0.001、P=0.908,0.000,0.000;72h:P=0.910,0.000,0.000、P=0.513,0.000,0.000);30mmol/L組明顯低于15mmol/L組、20mmol/L組、對照組、滲透組(TG、TPO:24
5、h:P<0.001;48h:P=0.289,0.314,0.000,0.000、P<0.001;72h:P=0.723,0.818,0.000,0.000、P=0.000,0.000,0.484,0.962);-TSH組不同濃度D-glucose刺激細(xì)胞24h、48h、72h后:15mmol/L組低于TSH刺激組、對照組、滲透組(TG,TPO:24h、48h、72h:P<0.001):20mmol/L組低于15mmol/L組、TSH刺激
6、組、對照組、滲透組(TG、TPO:24h:P=0.022,0.000,0.000,0.000、P=0.871,0.000,0000,0000;48h:P=0.855,0.000,0.000,0.000、P=0.383,0.000,0.000,0.000;72h:P=0.657,0.000,0.000,0.000、P=0.878,0.000,0.000,0.000);30mmol/L組明顯低于15mmol/L組、20mmol/L組、TSH
7、刺激組、對照組、滲透組(TG、TPO:24h:P=0.001,0.100,0.000,0.000,0.000、P<0.05;48h:P=0.859,0.996,0.000,0.000,0.000、P=0.131,0.027,0.000,0.000,0.000:72h:P=0.002,0.005,0.000,0.000,0.000、P=0.059,0.045,0.000,0.000,0.000);+TSH組不同濃度AGEs分別刺激細(xì)胞24
8、h、48h、72h后:0.25mg/dl組低于AGEs抗體組、對照組(TG、TPO:24h:P<0.001、P<0.001;48h:P<0.001、P<0.001;72h:P=0.685,0.000、P<0.001);0.5mg/dl組低于0.25mg/dl組、對照組(TG、TPO:24h:P=0.254,0.000、P<0.001;48h:P=0.669,0.000、P=0.229,0.000;72h:P=0.658,0.000、P=
9、0.539,0.000);1.0mg/dl組低于0.25mg/dl組、0.5mg/dl組、對照組(TG、TPO:24h:P=0.435,0.700,0.000、P=0.000,0.993,0.000;48h:P=0.002,0.003,0.003、P<0.001;72h:P=0.364,0.631,0.000、P<0.001);-TSH組不同濃度AGEs刺激細(xì)胞24h、48h、72h后:0.25mg/dl組低于AGEs抗體組、TSH刺激
10、組、對照組(TG、TPO:24h、48h、72h:P<0.001);0.5mg/dl組低于0.25mg/dl組、TSH刺激組、對照組(TG、TPO:24h:P=0.945,0.000、0.000、P<0.001;48h:P<0.001、P=0.001,0.000,0.000;72h:P=0.973,0.000,0.000、P=0.970,0.000,0.000);1.0mg/dl組低于0.25mg/dl組、0.5mg/dl組、TSH刺激
11、組、對照組(TG、TPO:24h:P=0.887,0.945,0.000,0.000、P=0.000,0.535,0.000,0.000:48h:P=0.887,0.594,0.000,0.000、P=0.001,0.893,0.000,0.000;72h:P<0.001、P<0.001)。 結(jié)論:不同濃度的D-glucose組及AGEs組的TG、TPOmRNA的表達(dá)較對照組有下降的趨勢,且隨著D-glucose、AGEs濃度的
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