<prompt> Malondialdehyde is increasingly being used as a marker of -Alcohol toxicityCytochrome P450 capacityLipid peroxidationLiver enzyme capacity  <response>: Lipid peroxidation can be described generally as a process under which oxidants such as free radicals attack lipids containing carbon-carbon double bonds, especially polyunsaturated fatty acids PUFAs.New discoveries about the involvement in cellular physiology and pathology, as well as the control of lipid peroxidation, continue to emerge every day. Given the enormity of this field, this review focuses on biochemical concepts of lipid peroxidation, production, metabolism, and signaling mechanisms of two main omega-6 fatty acids lipid peroxidation products: malondialdehyde MDA and, in paicular, 4-hydroxy-2-nonenal 4-HNE, summarizing not only its physiological and protective function as signaling molecule stimulating gene expression and cell survival, but also its cytotoxic role inhibiting gene expression and promoting cell death. Ref - pubmed.com 