SND1轉(zhuǎn)基因小鼠改善高脂飲食誘導(dǎo)的脂肪肝和胰島素抵抗
[Abstract]:Background & AIM: multifunctional protein SND1 can activate the expression of adipose-associated genes and regulate adipocyte differentiation at the transcriptional level. But the relationship between SND1 and metabolism in vivo is unclear. The aim of this study was to investigate the effects of over expression of SND1 on (NAFLD) and insulin sensitivity in mice with non alcoholic fatty liver disease induced by high fat diet (HFD). Methods: whole body overexpression SND1 protein mice (SND1-Tg) were constructed, and wild type mice were used as control group. After 8 weeks of birth, the liver and fat were fed with high fat diet (HFD) or normal diet (CD), and the histological and metabolic phenotypes of liver and fat were detected after 12 weeks. Liver expression microarray was used to screen differentially expressed genes and its molecular mechanism was investigated by qPCR. Results: in NAFLD induced by HFD, SND1 activated the synthesis of cholesterol and phospholipid in the liver and promoted the transport of lipids by LDL and the ab initio synthesis of lipids in white fats. It then reduces the accumulation of triglycerides in the liver and insulin sensitivity throughout the body. More importantly, HFD transgenic mice showed a decrease in liver fat lesions. This is largely due to higher output of LDL-cholesterol in the liver and more leptin secreted by white fat cells into the blood and acting on the liver. The underlying mechanism may be that SND1 promotes the nuclear localization of SREBP2 through SCAP, and that SREBP2, is a key transcriptional factor in cholesterol synthesis. Conclusion: SND1 transgenic mice promote cholesterol synthesis and improve fatty lesions and insulin resistance in non-alcoholic fatty liver.
【學(xué)位授予單位】:天津醫(yī)科大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2016
【分類(lèi)號(hào)】:R575
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