Membrane therapy using DHA suppresses epidermal growth factor receptor signaling by disrupting nanocluster formation

Journal of Lipid Research

卷:62

Mohamed Mlih¹  Michael L. Salinas¹  Jason Karpac¹  Xiaoli Wang²  Gabriella Webster³  Natividad R. Fuentes⁴  Sergio Cortes-Acosta⁴  Ian R. Corbin⁴  Robert S. Chapkin⁴ 

[1] Department of Nutrition, Texas A&M University, College Station, TX, USA;

[2] Interdisciplinary Faculty of Toxicology, Texas A&M University, College Station, TX, USA;

[3] Department of Molecular and Cellular Medicine, College of Medicine, Texas A&M Health Science Center, Bryan, TX, USA;

[4] Program in Integrative Nutrition and Complex Diseases, Texas A&M University, College Station, TX, USA;

关键词: Cancer;    Cholesterol;    Membranes/Fluidity;    Omega-3 fatty acids;    Receptors/Plasma membrane;    Super-resolution microscopy;   

DOI  :  

来源: DOAJ

【 摘 要 】

Abstract: Epidermal growth factor receptor (EGFR) signaling drives the formation of many types of cancer, including colon cancer. Docosahexaenoic acid (DHA, 22∶6Δ4,7,10,13,16,19), a chemoprotective long-chain n-3 polyunsaturated fatty acid suppresses EGFR signaling. However, the mechanism underlying this phenotype remains unclear. Therefore, we used super-resolution microscopy techniques to investigate the mechanistic link between EGFR function and DHA-induced alterations to plasma membrane nanodomains. Using isogenic in vitro (YAMC and IMCE mouse colonic cell lines) and in vivo (Drosophila, wild type and Fat-1 mice) models, cellular DHA enrichment via therapeutic nanoparticle delivery, endogenous synthesis, or dietary supplementation reduced EGFR-mediated cell proliferation and downstream Ras/ERK signaling. Phospholipid incorporation of DHA reduced membrane rigidity and the size of EGFR nanoclusters. Similarly, pharmacological reduction of plasma membrane phosphatidic acid (PA), phosphatidylinositol-4,5-bisphosphate (PIP2) or cholesterol was associated with a decrease in EGFR nanocluster size. Furthermore, in DHA-treated cells only the addition of cholesterol, unlike PA or PIP2, restored EGFR nanoscale clustering. These findings reveal that DHA reduces EGFR signaling in part by reshaping EGFR proteolipid nanodomains, supporting the feasibility of using membrane therapy, i.e., dietary/drug-related strategies to target plasma membrane organization, to reduce EGFR signaling and cancer risk.

【 授权许可】

Unknown