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- W2000934782 abstract "Studies were carried out to examine the effects of and interactions between NADPH, Fe2+, Fe3+ and ascorbate on lipid peroxidation in guinea-pig adrenal microsomes. Fe2+, at levels between 10−6 and 10−3 M, produced concentration-dependent increases in lipid peroxidation in adrenal microsomes; Fe2+ had a far greater effect than Fe3+. In liver microsomes, by contrast, Fe2+ and Fe3+ had quantitatively similar effects on lipid peroxidation. NADPH alone had no effect on malonaldehyde production by adrenal microsomes. However, in the presence of low Fe2+ concentrations (10−6 M), NADPH stimulated malonaldehyde production; the stimulation was not demonstrable in microsomes which had been heat-treated to inactive microsomal enzymes. In the presence of high Fe2+ levels (10−3 M), NADPH produced a concentration-dependent inhibition of lipid peroxidation; the inhibition was fully demonstrable in heat-treated microsomes. In the presence of Fe3+ (10−6 to 10−3 M), NADPH had little effect on lipid peroxidation, suggesting that NADPH does not significantly promote the reduction of Fe3+ to Fe2+ in adrenal microsomes. Ascorbate alone increased malonaldehyde production by adrenal microsomes; maximum stimulation occurred at a concentration of 10−4 M. Ascorbate-induced lipid peroxidation was also inhibited by NADPH. Ascorbate (5 · 10−6 to 1 · 10−4 M) synergistically interacted with low levels (10−6 M) of Fe2+ to enhance malonaldehyde production by adrenal microsomes. The synergism was not demonstrable at high concentrations (10−3 M) of Fe2+ At all concentrations (10−6 to 10−3 M) of Fe3+ studied, ascorbate synergistically increased the production of malonaldehyde. The results indicate that interactions between various endogenous substances may be important in the control of adrenal microsomal lipid peroxidation and that there are differences in the regulation of adrenal and hepatic lipid peroxidation." @default.
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- W2000934782 title "Factors affecting lipid peroxidation in guinea-pig adrenal microsomes" @default.
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- W2000934782 doi "https://doi.org/10.1016/0005-2760(81)90209-5" @default.
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