Lipogenesis is the metabolic process by which simple substrates like acetyl-CoA are converted into fatty acids, which are then assembled into complex lipids. This process is essential for producing cell membranes, signaling molecules, and energy storage forms, such as triglycerides. In normal physiology, lipogenesis is tightly regulated by nutritional and hormonal signals to meet the needs of different tissues.
Key enzymes (e.g. acetyl-CoA carboxylase [ACC], fatty acid synthase [FASN]) involved in lipogenesis.
Several enzymes play critical roles in lipogenesis, including acetyl-CoA carboxylase (ACC), which catalyzes the rate-limiting formation of malonyl-CoA, and fatty acid synthase (FASN), which catalyzes the assembly of fatty acids. Transcription factors such as SREBP1 (sterol regulatory element-binding protein 1) also regulate the expression of lipogenic genes.
Cancer cells often upregulate lipogenesis, even under conditions where normal cells might rely on dietary fat. This metabolic reprogramming supports rapid cell proliferation by providing the necessary lipids for new cellular membranes and energy storage. Elevated activity of enzymes like ACC and FASN is frequently observed in tumors.
High lipogenic activity in tumors has been correlated with aggressive phenotypes. Elevated expression of lipogenic enzymes is often associated with increased cell proliferation, invasion, and resistance to apoptosis. Consequently, tumors showing robust lipogenesis may be linked to poorer overall prognosis.
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