Differentiation of Expression Profiles of SREBF1 and SREBF2 Gene in Chicken

Sterol regulatory element-binding factor-1 and-2(SREBF1 and SREBF2)are important transcription factors involved in the regulating lipid homeostasis.Based on the essential role of SREBF1 and SREBF2,we measured the mRNA expression levels of the two genes in six various tissues at different growth points.Our results showed that the SREBF1 and SREBF2 were expressed in all six tissues examined in Erlang mountainous chicken(SD02)at 42 d,and were expressed abundantly in the uropygial gland and liver,with relatively lowest levels of expression in the abdominal fat,sebum cutaneum and leg muscle.The expression ratio of SREBF1 and SREBF2 in breast muscle,leg muscle,sebum cutaneum and uropygial gland exhibited a"decline-rise"trend.However,in liver,the expression ratio of these two genes exhibited a"decline-rise-decline"trend.Meanwhile,the expression level of SREBF1 gene of all tissues was lower than that of SREBF2 except for uropygial gland.The findings will provide important references for further function investigation of the two genes involved in fat deposition in chickens.

SREBF2-AS1调控胆固醇合成代谢促进乳腺癌生长

目的:研究SREBF2-AS1调控胆固醇合成代谢和SREBF2促进乳腺癌生长作用和分子机制。方法:qRT-PCR检测相关基因的转录水平。干扰SREBF2-AS1和过表达SREBF2后,MTT实验、BrdU实验和凋亡实验研究SREBF2-AS1在乳腺癌中作用及分子机制。结果:SREBF2-AS1在乳腺癌组织和乳腺癌细胞株中高表达。干扰掉SREBF2-AS1后抑制乳腺癌的生长和诱导其凋亡。进一步研究发现其通过调控SREBF2和胆固醇代谢进而调控乳腺癌生长。结论:SREBF2-AS1通过调控SREBF2和胆固醇代谢促进乳腺癌生长。

前列腺癌与良性前列腺增生中NFKBIA及SREBF2的表达

目的以实时荧光定量聚合酶链反应（PCR）技术研究良性前列腺增生（BPH）与前列腺癌（PCa）组织标本NFKBIA及SREBF2mRNA相对值，探讨NFKBIA及SREBF2比值在前列腺癌诊断中的特异性意义。方法通过实时荧光定量PCR检测63例PCa、37例BPH及3例正常前列腺组织NFKBIA及SREBF2的表达，比较其在PCa与BPH组织中定量的差异。结果与BPH比较，PCa组织NFKBIA及SREBF2mRNA的定量表达值分别下凋0．520和上调2．547，差异有统计学意义（P〈0．05）。结论实时荧光逆转录（RT）-PCR定量检测NFKBIA及SREBF2mRNA为前列腺癌的诊断提供了参考。

银杏叶提取物GBE50对培养细胞内胆固醇代谢的影响

目的研究银杏叶提取物GBE50对不同培养细胞内胆固醇含量的影响,及对HepG2细胞内胆固醇代谢相关基因HMGCR和SREBF2表达的调节。方法采用MTT法观察了GBE50对HepG2细胞生长的影响,用胆固醇氧化酶终点法检测GBE50对培养细胞HepG2、HUVEC、SH-SY5Y总胆固醇含量的影响;用荧光实时定量PCR技术检测了药物处理后HMGCR和SREBF2基因表达水平在HepG2细胞中的改变。结果GBE50在不影响HepG2细胞的增殖的剂量下可不同程度降低培养细胞HepG2,HUVEC内总胆固醇含量。对HepG2细胞内总胆固醇的影响呈一定的剂量及时间-效应关系,同时可以调节其中HMGCR、SREBF2基因的表达。结论GBE50可有效降低部分培养细胞内总胆固醇的含量,部分胆固醇代谢相关基因表达量的改变可能是GBE50调节HepG2细胞内胆固醇水平的机制之一。