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Oxidative Stress and Adrenocortical Insufficiency R PRASAD and others Oxidative stress and 221:3 R63–R73 Review adrenocortical insufficiency Open Access Oxidative stress and adrenocortical insufficiency R Prasad, J C Kowalczyk, E Meimaridou, H L Storr and L A Metherell Correspondence should be addressed Barts and the London School of Medicine and Dentistry, William Harvey Research Institute, Centre for to L A Metherell Endocrinology, Queen Mary University of London, John Vane Science Centre, Charterhouse Square, London Email EC1M 6BQ, UK [email protected] Abstract Maintenance of redox balance is essential for normal cellular functions. Any perturbation Key Words in this balance due to increased reactive oxygen species (ROS) leads to oxidative stress and " oxidative stress may lead to cell dysfunction/damage/death. Mitochondria are responsible for the majority " reactive oxygen species of cellular ROS production secondary to electron leakage as a consequence of respiration. " steroidogenesis Furthermore, electron leakage by the cytochrome P450 enzymes may render steroidogenic " adrenal insufficiency tissues acutely vulnerable to redox imbalance. The adrenal cortex, in particular, is well supplied with both enzymatic (glutathione peroxidases and peroxiredoxins) and non- enzymatic (vitamins A, C and E) antioxidants to cope with this increased production of ROS due to steroidogenesis. Nonetheless oxidative stress is implicated in several potentially lethal adrenal disorders including X-linked adrenoleukodystrophy, triple A syndrome and most recently familial glucocorticoid deficiency. The finding of mutations in antioxidant defence genes in the latter two conditions highlights how disturbances in redox homeostasis may Journal of Endocrinology have an effect on adrenal steroidogenesis. Journal of Endocrinology (2014) 221, R63–R73 Introduction Reactive oxygen species (ROS) are derived from O2 cardiovascular disease and ageing. Antioxidant defence and comprise molecules with varying oxidant properties. mechanisms are complex and can be specific to cell type At low concentrations, ROS modulate many cellular and furthermore to sub-cellular compartment. In compari- processes through redox-dependent signalling, including son to many other tissues, including those with high proliferation, differentiation, apoptosis, immune regu- metabolic demand such as the liver and brain, the adrenal lation and cellular adaptation to stress (Ray et al. 2012, cortex has high levels of several antioxidants, both Sena & Chandel 2012). A critical balance in redox status enzymatic and non-enzymatic. This investment is necess- needs to be maintained and this is achieved by numerous ary given the high turnover of lipid within the mito- interacting antioxidant pathways. Oxidative stress chondria and ROS production during steroidogenesis. occurs when this balance is disturbed. ROS can then Disturbances in redox homeostasis within the adreno- have deleterious effects on proteins, lipids and nucleic cortical environment may therefore have an effect on acids, ultimately leading to cell damage and death. steroidogenesis, as evidenced by several disorders of Oxidative stress is implicated in a plethora of conditions adrenal insufficiency, including most recently familial including neurodegenerative disorders, diabetes mellitus, glucocorticoid deficiency (FGD). http://joe.endocrinology-journals.org Ñ 2014 The authors This work is licensed under a Creative Commons DOI: 10.1530/JOE-13-0346 Published by Bioscientifica Ltd Attribution 3.0 Unported License. Printed in Great Britain Downloaded from Bioscientifica.com at 09/30/2021 12:17:17PM via free access Review R PRASAD and others Oxidative stress and 221:3 R64 adrenocortical insufficiency ROS generation in mitochondria ions to hydrogen peroxide (H2O2). H2O2 can also contribute Mitochondria are responsible for the majority of cellular to oxidative stress by reacting with free metals to form OH. %K ROS production secondary to electron leakage as a con- In addition, in comparison to O2 , which tends to remain sequence of respiration. During respiration, electrons are at the site of production, H2O2 readily traverses membranes transferred across to molecular oxygen to generate water via into other subcellular compartments where it may affect the four complexes of the electron transport chain. The signalling pathways. electron–proton gradient established during this process is Several compartment-specific antioxidant mechani- used to generate energy in the form of ATP. As a result of sms are in place to target superoxide production. electron leakage at complex I (NADH dehydrogenase) and Cytoplasmic copper/zinc-dependent SOD1 (CuZnSOD), complex III (cytochrome c reductase), a small percentage of mutations of which are associated with the neurodegener- the molecular oxygen is converted to superoxide anions ative disorder, amyotrophic lateral sclerosis, and mito- K (O2% )(Fig. 1). These superoxide anions can be protonated chondrial matrix manganese-dependent SOD2 (MnSOD) to form strongly oxidant hydroxyl radicals (%OH) which can catalyse the conversion of superoxide anions into H2O2 cause oxidative modification of proteins and membrane (Fig. 1). H2O2 has preferential reactivity towards (seleno) lipids. ROS can also modify key components of the electron cysteine (Cys) residues in target proteins, and is detoxified transport chain thereby further exacerbating electron by members of the glutathione peroxidase (GPX) and leakage and superoxide production. Dismutation, catalysed peroxiredoxin (PRDX) families, discussed later in this by the superoxide dismutases (SODs), reduces superoxide review. The relative contribution of each of these enzymes H+ H+ H+ Intermembrane space NNT I e– e– III IV Inner membrane II Matrix Journal of Endocrinology NADH NAD+ – ·– NADPH + NAD+ NADP+ + NADH e + O2 O2 H+ MnSOD + ·– 2H + 2 O2 H2O2 + O2 GSR GSH GLRX2 NADPH PRDX3 GPX GSH GSR NADPH TXNRD2 TXN2 H2O + 1/2 O2 Figure 1 Detoxification of mitochondrial superoxide species produced during electron leakage from the mitochondrial electron transport chain. The superoxide K K radical O2% , produced from electrons (e ) leaked at complexes I and III of the mitochondrial electron transport chain, can be protonated to form H2O2,this process of dismutation is catalysed by MnSOD. Mitochondrial H2O2 is detoxified by the thioredoxin and GSH systems, which require high concentrations of nicotinamide adenine dinucleotide phosphate (reduced NADPH) provided by NNT. The flow of electron transfer from NADPH to PRDX3 and GPX, through the various components of the thioredoxin and GSH systems, is shown in the figure. GSR, glutathione reductase; GSH, reduced glutathione; TXNRD2, thioredoxin reductase 2; TXN2, thioredoxin 2; GLRX2, glutaredoxin 2; NNT, nicotinamide nucleotide transhydrogenase; PRDX3, peroxiredoxin 3; GPX, glutathione peroxidase; MnSOD, manganese superoxide dismutase. http://joe.endocrinology-journals.org Ñ 2014 The authors Published by Bioscientifica Ltd DOI: 10.1530/JOE-13-0346 Printed in Great Britain Downloaded from Bioscientifica.com at 09/30/2021 12:17:17PM via free access Review R PRASAD and others Oxidative stress and 221:3 R65 adrenocortical insufficiency may be tissue- and compartment-specific and determined molecular oxygen. NADPH donates two electrons which by the source of H2O2 and the expression levels of each are transferred to P450 enzymes via two electron transfer individual enzyme. proteins, ferredoxin reductase (adrenodoxin reductase) In addition to electron leakage during respiration, and then ferredoxin (adrenodoxin) (Ziegler et al. 1999, other sources of superoxide production within the Grinberg et al. 2000). Ferredoxin reductase is a flavin mitochondria include reactions catalysed by xanthine/ adenine dinucleotide, containing flavoenzyme and is able xanthine oxidase, uncoupled nitric oxide synthases, to accept both electrons from NADPH. These are then NADPH-dependent oxidases (NOXs) and, most pertinent passed one at a time to ferredoxin and finally to the P450 to the adrenal cortex, cytochrome P450 isoforms. The enzymes for hydroxylation of substrates, the order of P450 enzymes are involved in the biosynthesis of electron transfer is as follows (Hanukoglu 2006): cholesterol-derived steroidal compounds (Miller 2005). NADPH/ferrodoxin reductase/ferrodoxin/P450 In steroidogenic tissues, the levels of expression of P450 In a tightly coupled system, all electrons from NADPH enzymes are approximately ten times higher than those of are used in substrate hydroxylation; however, electron the other electron transport chain proteins and electron transfer within the P450 system can be relatively leakage in the P450 system can also contribute to ROS ‘uncoupled’ or ‘leaky’, with the rate of electron leakage production (Hanukoglu & Hanukoglu 1986, Hanukoglu varying depending on P450 subtype (Hanukoglu 2006). 2006). P450 groups are represented by microsomal Up to 40% of total electron flow in the P450c11b system, cytochrome P450s present in the endoplasmic reticulum, catalysing the final step in cortisol synthesis, is directed to and mitochondrial cytochrome P450s present in the inner ROS formation in comparison to 15% in the P450scc mitochondrial membrane. Type 1 P450 isoforms present system (Rapoport et al. 1995). Thus steroidogenesis, in the mitochondria include P450scc (side-chain cleavage; particularly glucocorticoid production, contributes signi- CYP11A1), which catalyses the conversion of cholesterol ficantly to cellular ROS production (Fig. 2). Type 2 b to pregnenolone, and P450c11 (CYP11B1) responsible microsomal
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