# c-Myc/GRPEL1 maintains fatty acid synthesis via FASN to support PDAC cell proliferation

## TL;DR

This study shows how the c-Myc/GRPEL1 pathway supports pancreatic cancer cell growth by promoting fatty acid synthesis.

## Contribution

The study identifies a novel mechanism linking mitochondrial protein quality control to fatty acid synthesis in pancreatic cancer.

## Key findings

- c-Myc promotes PDAC cell proliferation by upregulating GRPEL1, an MPQC component.
- Targeting the c-Myc/GRPEL1 axis inhibits fatty acid synthesis and PDAC tumor growth.
- c-Myc, GRPEL1, and FASN are overexpressed in PDAC tissues and correlated with each other.

## Abstract

Pancreatic ductal adenocarcinoma (PDAC) cells undergo mitochondrial metabolic reprogramming to support their proliferation. However, the mechanisms by which mitochondrial protein quality control (MPQC) regulates cell metabolism remain unclear. Here, we found that c-Myc promotes PDAC cell proliferation by transcriptionally upregulating the expression of GRPEL1, an essential MPQC component. Mechanistically, c-Myc-regulated GRPEL1 maintains oxidative phosphorylation (OXPHOS) and minimizes ROS accumulation, thereby facilitating de novo fatty acid (FA) synthesis through the transcriptional upregulation of fatty acid synthase (FASN) expression. Targeting the c-Myc/GRPEL1 axis to block FASN-regulated FA synthesis inhibited PDAC cell proliferation and tumor growth in both cell models and patient-derived organoids (PDOs), whereas FA supplementation partially reversed this inhibitory effect. Clinically, c-Myc expression is positively associated with the levels of MPQC components in pancreatic ductal cells, with GRPEL1 ranking among the top hits. Furthermore, c-Myc, GRPEL1, and FASN are all expressed at higher levels in PDAC tissues than in peri-tumoral pancreatic tissues, and both c-Myc and GRPEL1 expression levels are positively correlated with that of FASN. These findings suggest that therapeutic inhibition of FA synthesis may be promising for treating PDAC patients with active c-Myc/GRPEL1/FASN signaling. Overall, this study demonstrates that FA synthesis mediated by the c-Myc/GRPEL1/FASN axis is essential for PDAC growth.