Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10756338 | Biochemical and Biophysical Research Communications | 2014 | 6 Pages |
Abstract
Non-alcoholic fatty liver disease (NAFLD) is intimately associated with insulin resistance and hypertriglyceridemia, whereas many of the mechanisms underlying this association are still poorly understood. In the present study, we investigated the relationship between microsomal triglyceride transfer protein (MTP) and markers of endoplasmic reticulum (ER) stress in the liver of rats subjected to neonatal monosodium l-glutamate (MSG)-induced obesity. At age 120Â days old, the MSG-obese animals exhibited hyperglycemia, hypertriglyceridemia, insulin resistance, and liver steatosis, while the control (CTR) group did not. Analysis using fast protein liquid chromatography of the serum lipoproteins revealed that the triacylglycerol content of the very low-density lipoprotein (VLDL) particles was twice as high in the MSG animals compared with the CTR animals. The expression of ER stress markers, GRP76 and GRP94, was increased in the MSG rats, promoting a higher expression of X-box binding protein 1 (XBP-1), protein disulfide isomerase (PDI), and MTP. As the XBP-1/PDI/MTP axis has been suggested to represent a significant lipogenic mechanism in the liver response to ER stress, our data indicate that hypertriglyceridemia and liver steatosis occurring in the MSG rats are associated with increased MTP expression.
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Authors
Lucas Martins França, Larissa Nara Costa Freitas, Vinicyus Teles Chagas, Caio Fernando Ferreira Coêlho, Wermerson Assunção Barroso, Graciomar Conceição Costa, Lucilene Amorim Silva, Victor Debbas, Francisco Rafael Martins Laurindo,