Polyunsaturated fatty acyl chains (PUFAs) (PUFAs)

Lipid membrane polyunsaturated fatty acyl chains (PUFAs) are essential structural components of cellular and organelle membranes, where they play a critical role in maintaining membrane fluidity and serving as precursors for bioactive signaling molecules like prostaglandins and leukotrienes (Yang & Stockwell, 2016). These chains are uniquely characterized by the presence of bis-allylic methylene groups, which are highly susceptible to non-enzymatic lipid peroxidation initiated by reactive oxygen species (Kagan et al., 2017). This oxidative degradation process is the central execution mechanism of ferroptosis, a form of iron-dependent regulated cell death that has been implicated in the pathogenesis of neurodegenerative diseases, ischemia-reperfusion injury, and certain therapy-resistant cancers (Conrad et al., 2018). In the context of drug development, these chains are targeted by deuterated polyunsaturated fatty acids (D-PUFAs), such as RTW1000, which utilize the kinetic isotope effect to reinforce carbon-hydrogen bonds against oxidative attack, thereby protecting membrane integrity (Hill et al., 2012). Additionally, the enzymatic incorporation of PUFAs into phospholipids by Acyl-CoA synthetase long-chain family member 4 (ACSL4) is a key regulatory point for determining a cell's sensitivity to ferroptotic stimuli, making the composition of these chains a focal point for both neuroprotective and oncological therapeutic strategies (Doll et al., 2017).

Other names

Polyunsaturated fatty acidsMembrane PUFAsPhospholipid polyunsaturated fatty acyl groupsBis-allylic polyunsaturated fatty acidsMembrane-bound polyunsaturated fatty acids

Deuterated PUFAs (D-PUFAs) inhibit lipid peroxidation by replacing hydrogen with deuterium at bis-allylic positions, utilizing the kinetic isotope effect to strengthen C-D bonds against reactive oxygen species (Shchepinov, 2007). Other agents may modulate the incorporation of these chains into phospholipids via enzymes like ACSL4 to control ferroptosis sensitivity (Kagan et al., 2017).