Abstract
The effect of hypothyroidism, induced by 6-n-propyl-2-thiouracil (PTU) administration to rats, on the retinoylation reaction and oxidative status was investigated in rat-testes mitochondria. In hypothyroid mitochondria, when compared to euthyroid controls, we found a noticeable increase in the amount of all-trans-retinoic acid (atRA) bound to mitochondrial proteins by an acylation process (34.2 ± 1.9 pmoles atRA/mg protein/360 min and 22.2 ± 1.7 pmoles atRA/mg protein/360 min, respectively). This increase, which was time- and temperature-dependent, was accompanied by a strong reduction in the cardiolipin (CL) amount in the mitochondrial membranes of hypothyroid (2.6 ± 0.2%) as compared to euthyroid rats (4.5 ± 0.5%) Conversely, a decreased retinoylation reaction was observed when CL liposomes were added to mitochondria or mitoplasts from both euthyroid and hypothyroid rats, thus confirming a role of CL in the retinoylation process. In mitochondria from the latter animals an increase of the level of oxidized CL occurred. The ATP level, which was reduced in hypothyroid mitochondria (27.3 ± 4.1 pmoles ATP/mg protein versus 67.1 ± 8.3 pmoles ATP/mg protein of euthyroid animals), was surprisingly increased in mitochondria by the retinoylation reaction in the presence of 100 nM atRA (481.5 ± 19.3 pmoles ATP/mg protein of hypothyroid animals versus 84.7 ± 7.7 pmoles ATP/mg protein of euthyroid animals). Overall, in hypothyroid rat-testes mitochondria the increase in retinoylation activity correlates with a significant depletion of the CL level, due to a peroxidation of this lipid. In addition, an enhanced production of reactive oxygen species was observed.
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Senatore, V., Cione, E., Gnoni, A. et al. Retinoylation Reactions are Inversely Related to the Cardiolipin Level in Testes Mitochondria from Hypothyroid Rats. J Bioenerg Biomembr 42, 321–328 (2010). https://doi.org/10.1007/s10863-010-9293-8
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DOI: https://doi.org/10.1007/s10863-010-9293-8