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Nicotinamide N-methyltransferase (NNMT) upregulation via the mTORC1-ATF4 pathway activation contributes to palmitate-induced lipotoxicity in hepatocytes
In this study, using AML12 cells, a non-transformed murine hepatocyte cell line, exposed to palmitate (a 16-C saturated fatty acid) as an experimental model, we investigated the role and mechanisms of nicotinamide N-methyltransferase (NNMT), a methyltransferase catalyzing nicotinamide methylation and degradation, in hepatic lipotoxicity. We initially identified activating transcription factor 4 (ATF4) as a major transcription factor for hepatic NNMT expression. Here, we demonstrated that palmitate upregulates NNMT expression via activating ATF4 in a mechanistic target of rapamycin complex 1 (mTORC1)-dependent mechanism in ...
Source: Am J Physiol Cell Ph... - August 11, 2021 Category: Cytology Authors: Alexandra Griffiths Jun Wang Qing Song Iredia D Iyamu Lifeng Liu Jooman Park Yuwei Jiang Rong Huang Zhenyuan Song Source Type: research

Amelioration of Non-alcoholic Fatty Liver Disease by Hepatic Stimulator Substance via Preservation of Carnitine Palmitoyl Transferase-1 Activity.
In conclusion, HSS reduces lipotoxicity to mitochondria most likely via preservation of CPT-1. PMID: 26108664 [PubMed - as supplied by publisher]
Source: Am J Physiol Cell Ph... - June 24, 2015 Category: Cytology Authors: Xiao W, Ren M, Zhang C, Li S, An W Tags: Am J Physiol Cell Physiol Source Type: research