TY - JOUR
T1 - Inhibitory effect of the antioxidant ethoxyquin on electron transport in the mitochondrial respiratory chain
AU - Reyes, JoséL L.
AU - Hernández, M. Elisabeth
AU - Meléndez, Estela
AU - Gómez-Lojero, Carlos
N1 - Funding Information:
Acknowledgements-The authors gratefully acknowledge the suggestions and critical review of the -manuscript by Drs. D. Gonz&lez-Halnhen of the Institute de Fisioloaia Celular, National Uiiversity of Mexico, and D. w. Krogmann of the Department of Biochemistry of Purdue University. Submitochondrial particles from bovine heart were prepared by Miriam Vgzquez. The authors also acknowledge Elvia Hernandez for skilful secretarial assistance and Alfred0 Padilla for the illustrations. This work was supported, in part, by grants from the Consejo National de Ciencia y Tecnologia, Mtxico. Elisabeth Hernandez was the recipient of a scholarship from the Consejo National de Ciencia y Tecnogia, MCxico, to assist her in obtaining the Master of Science degree in Pharmacology.
PY - 1995/1/31
Y1 - 1995/1/31
N2 - Ethoxyquin (6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, EQ) is an antioxidant used as a preservative in animal and human foods. In a previous work, we demonstrated that EQ induces an inhibition of renal secretory mechanisms that are dependent on metabolic energy; EQ inhibits renal ATPases. In the present study, we analyzed the effects of EQ on the metabolic pathways of renal and hepatic rat cells, as well as on mitochondria and submitochondrial particles isolated from bovine heart and kidney. EQ induced a mild inhibition of oxygen uptake when it was added to whole homogenates of rat renal cortex in the presence of glucose. In contrast, a strong concentration-dependent inhibition was produced when EQ was added to preparations of intact liver mitochondria or to submitochondrial particles isolated from renal cortex. In the presence of NADH, 90% inhibition was attained at a final concentration of 1 mM EQ. The direct inhibitory effect of EQ on NADH dehydrogenase was a most relevant finding, since no inhibitor for the partial reaction of NADH-ferricyanide on this complex has been reported previously.
AB - Ethoxyquin (6-ethoxy-2,2,4-trimethyl-1,2-dihydroquinoline, EQ) is an antioxidant used as a preservative in animal and human foods. In a previous work, we demonstrated that EQ induces an inhibition of renal secretory mechanisms that are dependent on metabolic energy; EQ inhibits renal ATPases. In the present study, we analyzed the effects of EQ on the metabolic pathways of renal and hepatic rat cells, as well as on mitochondria and submitochondrial particles isolated from bovine heart and kidney. EQ induced a mild inhibition of oxygen uptake when it was added to whole homogenates of rat renal cortex in the presence of glucose. In contrast, a strong concentration-dependent inhibition was produced when EQ was added to preparations of intact liver mitochondria or to submitochondrial particles isolated from renal cortex. In the presence of NADH, 90% inhibition was attained at a final concentration of 1 mM EQ. The direct inhibitory effect of EQ on NADH dehydrogenase was a most relevant finding, since no inhibitor for the partial reaction of NADH-ferricyanide on this complex has been reported previously.
KW - ATPase
KW - cell respiration
KW - heart
KW - kidney
KW - liver
KW - polarography
UR - http://www.scopus.com/inward/record.url?scp=0028871052&partnerID=8YFLogxK
U2 - 10.1016/0006-2952(94)00487-7
DO - 10.1016/0006-2952(94)00487-7
M3 - Artículo
SN - 0006-2952
VL - 49
SP - 283
EP - 289
JO - Biochemical Pharmacology
JF - Biochemical Pharmacology
IS - 3
ER -