title: Cytotoxic aldehydes originating from the peroxidation of liver microsomal lipids. Identification of 4,5-dihydroxydecenal.
abstract: During the NADPH-Fe-induced peroxidation of liver microsomal lipids products are formed which are provided with cytopathological activities. In a previous study one of the major products was identified as an aldehyde of the 4-hydroxyalkenal class, namely 4-hydroxynonenal. In the present study another cytotoxic product has been isolated and identified as 4,5-dihydroxy-2,3-decenal. The isolation was performed by means of thin-layer chromatography and high-pressure liquid chromatography and the structure was ascertained mainly by means of mass spectroscopy of the free aldehyde and of its derivatives. In the absence of NADPH-Fe liver microsomes produced no 4,5-dihydroxydecenal. The inhibitory activity of 4,5-dihydroxydecenal on microsomal glucose-6-phosphatase is somewhat lower than that exhibited by 4-hydroxynonenal. This lower inhibitory activity correlates with the lower capacity to bind to the microsomal protein of 4,5-dihydroxydecenal as compared to 4-hydroxynonenal. The reactivities of the two aldehydes with cysteine were comparable. The production of toxic aldehydes may represent a mechanism by which lipid peroxidation causes deleterious effects on cellular functions.
mesh_terms: D000447:Aldehydes / Q000302:isolation & purification* / Q000378:metabolism / Q000494:pharmacology; D000818:Animals; D002851:Chromatography, High Pressure Liquid; D005952:Glucose-6-Phosphatase / Q000378:metabolism; D007700:Kinetics; D008054:Lipid Peroxides / Q000378:metabolism*; D008297:Male; D013058:Mass Spectrometry; D008862:Microsomes, Liver / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D013056:Spectrophotometry, Ultraviolet
chemical_list: C040513:4,5-dihydroxy-2,3-decenal; D000447:Aldehydes; D008054:Lipid Peroxides; D005952:Glucose-6-Phosphatase