S1P and plasmalogen derived fatty aldehydes in cellular signaling and functions

Area of Science:

• Biochemistry
• Cell Biology
• Lipid Metabolism

Background:

• Long-chain fatty aldehydes are low-concentration intermediates in mammalian cells.
• They link fatty acid and fatty alcohol metabolism.

Purpose of the Study:

• Investigate the roles and functions of various long-chain fatty aldehydes.
• Explore their signaling capabilities and interactions within cells.

Main Methods:

• Enzymatic hydrolysis of phospholipids and sphingosine-1-phosphate.
• Analysis of aldehyde adduct formation with glutathione, DNA, and proteins.
• Assessment of cellular responses including JNK signaling, apoptosis, and histone acetylation.

Main Results:

• Fatty aldehydes are generated from glycerophospholipids and sphingosine-1-phosphate.
• 2-halofatty aldehydes and trans ∆2-hexadecenal (∆2-HDE) activate JNK signaling, BAX, and apoptosis.
• These aldehydes form adducts with glutathione, DNA, and proteins like HDAC1.
• ∆2-HDE modulates HDAC activity and histone acetylation.
• α-halo fatty aldehydes induce endothelial dysfunction and cellular toxicity.

Conclusions:

• Long-chain fatty aldehydes function as signaling lipids.
• They form adducts with glutathione, proteins (including HDACs), and DNA.
• These interactions regulate cellular functions and can lead to toxicity.