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Inhibition of succinic semialdehyde dehydrogenase activity by alkenal products of lipid peroxidation.

Authors: Nguyen, E  Picklo MJ, SR 
Citation: Nguyen E and Picklo MJ Sr, Biochim Biophys Acta. 2003 Jan 20;1637(1):107-12.
Pubmed: (View Article at PubMed) PMID:12527414

Lipid peroxidation causes the generation of the neurotoxic aldehydes acrolein and 4-hydroxy-trans-2-nonenal (HNE). These products are elevated in neurodegenerative diseases and acute CNS trauma. Previous studies demonstrate that mitochondrial class 2 aldehyde dehydrogenase (ALDH2) is susceptible to inactivation by these alkenals. In the liver and brain another mitochondrial aldehyde dehydrogenase, succinic semialdehyde dehydrogenase (SSADH/ALDH5A1), is present. In this study, we tested the hypothesis that aldehyde products of lipid peroxidation inhibit SSADH activity using the endogenous substrate, succinic semialdehyde (SSA, 50 microM). Acrolein potently inhibited SSADH activity (IC(50)=15 microM) in rat brain mitochondrial preparations. This inhibition was of an irreversible and noncompetitive nature. HNE inhibited activity with an IC(50) of 110 microM. Trans-2-hexenal (HEX) and crotonaldehyde (100 microM each) did not inhibit activity. These data suggest that acrolein and HNE disrupt SSA metabolism and may have subsequent effects on CNS neurochemistry.

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RGD Object Information
RGD ID: 1600514
Created: 2007-03-12
Species: All species
Last Modified: 2007-03-12
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.