Mitogenic responses of vascular smooth muscle cells to lipid peroxidation-derived aldehyde 4-hydroxy-trans-2-nonenal (HNE): role of aldose reductase-catalyzed reduction of the HNE-glutathione conjugates in regulating cell growth

The Journal of Biological Chemistry
Kota V RamanaSatish K Srivastava

Abstract

Products of lipid peroxidation such as 4-hydroxy-trans-2-nonenal (HNE) trigger multiple signaling cascades that variably affect cell growth, differentiation, and apoptosis. Because glutathiolation is a significant metabolic fate of these aldehydes, we tested the possibility that the bioactivity of HNE depends upon its conjugation with glutathione. Addition of HNE or the cell-permeable esters of glutathionyl-4-hydroxynonenal (GS-HNE) or glutathionyl-1,4-dihydroxynonene (GS-DHN) to cultures of rat aortic smooth muscle cells stimulated protein kinase C, NF-kappaB, and AP-1, and increased cell growth. The mitogenic effects of HNE, but not GS-HNE or GS-DHN, were abolished by glutathione depletion. Pharmacological inhibition or antisense ablation of aldose reductase (which catalyzes the reduction of GS-HNE to GS-DHN) prevented protein kinase C, NF-kappaB, and AP-1 stimulation and the increase in cell growth caused by HNE and GS-HNE, but not GS-DHN. The growth stimulating effect of GS-DHN was enhanced in cells treated with antibodies directed against the glutathione conjugate transporters RLIP76 (Ral-binding protein) or the multidrug resistance protein-2. Overexpression of RLIP76 abolished the mitogenic effects of HNE and its glutathi...Continue Reading

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