Palmitate paves the way to lung metastasis

Area of Science:

• Oncology
• Metabolism
• Cell Biology

Background:

• Primary tumors and metabolic changes, such as high-fat diets, can influence the tumor microenvironment.
• The formation of a premetastatic niche is crucial for cancer metastasis.
• Alveolar type 2 (AT2) cells play a role in lung homeostasis and may be influenced by systemic factors.

Purpose of the Study:

• To investigate the role of alveolar type 2 (AT2) cells in promoting lung metastasis.
• To identify the mechanisms by which primary tumors and high-fat diets facilitate metastasis.
• To explore potential therapeutic targets for reducing cancer spread.

Main Methods:

• Analyzing palmitate secretion from AT2 cells in response to primary tumors and high-fat diet.
• Investigating the utilization of palmitate by cancer cells, focusing on carnitine palmitoyltransferase 1a (CPT1a) and lysine acetyltransferase 2a (KAT2a).
• Assessing the impact of blocking CPT1a and KAT2a on NF-κB/p65 acetylation and metastasis formation in mouse models.

Main Results:

• Primary breast tumors and high-fat diets induce palmitate secretion from AT2 cells.
• Palmitate is utilized by cancer cells through CPT1a and KAT2a to acetylate NF-κB/p65.
• Inhibition of CPT1a and KAT2a significantly reduced lung metastasis in both lean and high-fat diet mice.

Conclusions:

• AT2 cell-derived palmitate contributes to the formation of a premetastatic niche, promoting lung metastasis.
• The metabolic pathway involving palmitate, CPT1a, KAT2a, and NF-κB/p65 acetylation is critical for metastasis.
• Targeting these enzymes offers a potential strategy to prevent or reduce cancer spread.