Protein conjugated with aldehydes derived from lipid peroxidation as an independent parameter of the carbonyl stress in the kidney damage
© Medina-Navarro et al; licensee BioMed Central Ltd. 2011
Received: 30 September 2011
Accepted: 7 November 2011
Published: 7 November 2011
One of the well-defined and characterized protein modifications usually produced by oxidation is carbonylation, an irreversible non-enzymatic modification of proteins. However, carbonyl groups can be introduced into proteins by non-oxidative mechanisms. Reactive carbonyl compounds have been observed to have increased in patients with renal failure. In the present work we have described a procedure designed as aldehyde capture to calculate the protein carbonyl stress derived solely from lipid peroxidation.
Acrolein-albumin adduct was prepared as standard at alkaline pH. Rat liver microsomal membranes and serum samples from patients with diabetic nephropathy were subjected to the aldehyde capture procedure and aldol-protein formation. Before alkalinization and incubation, samples were precipitated and redisolved in 6M guanidine. The absorbances of the samples were read with a spectrophotometer at 266 nm against a blank of guanidine.
Evidence showed abundance of unsaturated aldehydes derived from lipid peroxidation in rat liver microsomal membranes and in the serum of diabetic patients with advanced chronic kidney disease. Carbonyl protein and aldol-proteins resulted higher in the diabetic nephropathy patients (p < 0.004 and p < 0.0001 respectively).
The aldehyde-protein adduct represents a non oxidative component of carbonyl stress, independent of the direct amino acid oxidation and could constitute a practical and novelty strategy to measure the carbonyl stress derived solely from lipid peroxidation and particularly in diabetic nephropathy patients. In addition, we are in a position to propose an alternative explanation of why alkalinization of urine attenuates rhabdomyolysis-induced renal dysfunction.
Keywordsfatty acids lipid peroxidation protein carbonyl unsaturated aldehydes renal failure rhabdomyolysis
Oxidation can cause proteins to suffer loss of catalytic function, degradation, proteolysis and several degrees of denaturation [1, 2]. Protein oxidation increases during aging and has been consistently associated with many pathologies such as diabetes, atherosclerosis, cataracts, renal damage, and more [3, 4]. One of the well-defined and characterized protein modifications usually produced by oxidation is carbonylation, an irreversible non-enzymatic modification of proteins . Therefore, oxidation of protein can be measured by the addition of carbonyl groups. The spectrophotometric assay using 2, 4-dinitrophenylhydrazine (DNPH) constitutes one of the primary ways of detecting carbonyls, since it is relatively easy, fast and inexpensive [6, 7]. Carbonyl groups are introduced into proteins by metal-catalyzed oxidation and a variety of reactive nitrogen species (nitric oxide, peroxinitrite), reactive chlorine species (hypochlorous acid, nitryl chloride) and reactive oxygen species (hydrogen peroxide, hydroxyl radical, peroxiradicals, ozone, etc.)[8–10].
However, carbonyl groups can be introduced into proteins by non-oxidative mechanisms, and this can increase carbonyl levels in proteins in an extensive manner. Carbonyl groups can be introduced into proteins by reaction with molecules such as acrolein, 4-hydroxy-2-nonenal (HNE) and other alpha-beta unsaturated aldehydes derived from lipid peroxidation that react with protein residues via several kinds of reactions, included Schiff base formation and Michael addition reactions . Hence, the presence of carbonyl is not necessarily indicative of direct oxidation of amino acid residues in proteins, and the importance of lipid peroxidation and the participation of reactive low molecular weight aldehydes on protein carbonylation have been demonstrated [12–14].
Reactive carbonyl compounds derived from lipids and carbohydrates by both oxidative and non-oxidative routes have been observed to have increased in patients with renal damage. These compounds react with proteins, resulting in the condition described as "carbonyl stress", which underlies the development of uremic complications . Uremic plasma contains elevated levels of low weight molecular carbonyl compounds . These do not seem to be secondary products of protein glycation nor do they depend on glucose plasma concentration, but more probably are reactive carbonyl compounds derived from carbohydrates, lipids and amino acids [16, 17]. Rhabdomyolisis with extensive muscle release of myoglobyn (Mb) generates kidney damage caused by redox cycling of the heme radicals . Lipid peroxidation catalyzed by the hemoprotein's radicals is probably the more documented explanation for the oxidative damage associated with rhabdomyolysis , and this condition constitutes another potential source of the alpha beta unsaturated aldehydes and carbonyl stress in the kidney.
Proteins have an enormous capability to conjugate with alpha-betha unsaturated aldehydes. At alkaline pH albumin isomerizes and exposes cysteine thiolate anions. Previous research indicates that the highly nucleophilic thiolate state is the adduct target for the alfa, beta-unsaturated carbonyl compounds [20–22]. We found that, in addition to the described reactions, unsaturated aldehydes at alkaline pH can undergo aldolic condensation linked to the proteins and form stable adducts with corresponding increases in absorbance at 266 nm. Taking advantage of properties mentioned we implement a simple procedure to calculate the abundance of these compounds from a sample containing proteins such as serum or plasma (aldehyde capture).
We observed an intense aldehyde capture during the rat liver microsomal peroxidation catalyzed by NADPH, demonstrating the participation of membranes fatty acids phospholipids as the source of alpha beta unsaturated aldehydes. Then, serum samples were subjected to the aldehyde capture and the results permitted us to corroborate the alpha-beta unsaturated aldehyde-dependent carbonyl stress derived from lipid peroxidation in the serum of diabetic patients with advanced chronic kidney disease.
Acrolein condensation proceeds even with protein linked (aldehyde capture)
Aldol-protein formation in the catalyzed microsomal peroxidation and its inhibition with bisulfite
Protein carbonyl and Aldol-proteins in serum samples from patients with diabetic nephropathy
Amount of the protein carbonyls and aldol-proteins in serum samples
n = 21
n = 18
(nmol/mg of protein)
1.17 ± 0.32
1.74 ± 0.54
(μg/mg of protein)
106.75 ± 5.7
123.35 ± 14.9
after aldehyde capture
(nmol/mg of protein)
1.09 ± 0.17
3.24 ± 0.55
90.9 ± 5.3
30.4 ± 14.3
In the present work we have described a procedure to calculate the protein carbonyl content derived from unsaturated aldehydes, by the use of changes experimented by the albumin molecule at alkaline pH. Formation of stable adducts or aldol-proteins in serum samples constitute a practical and novelty strategy to measure the carbonyl stress derived from lipid peroxidation.
Lipid peroxidation is one of the principal outcomes of carbonyl stress damage to biological components. The most abundant products of lipid peroxidation are aldehydes such as acrolein, malondialdehyde (MDA), 4-hydroxy-2-nonenal (HNE) and 4-hydroxy-2-hexenal (HHE), and are frequently measured as indicators of lipid peroxidation . Conjugated diene measurement is useful in studies of pure lipids and it measures an early stage in the peroxidation process . The measurement of malondialdehyde (MDA) by the thiobarbituric acid reactive substances assay (TBARS) is generally not a good method when applied to biological samples, although it has been widely utilized in the past . These compounds and some others like isoprostanes are all measurable in biological fluids but the analytical methods used turned out to be complex and require sample preparation involving extraction and purification steps .
In the present work, we calculated the abundance of alpha beta unsaturated aldehydes in the plasma of diabetic patients with and without renal damage. We used a simple procedure to calculate the content of aldehydes captured by serum proteins. First we used microsomal membranes to demonstrate the aldehyde condensation-dependent absorbance increase at 266 nm and the plausible protein-dependent aldehyde capture. The aldehyde incorporation to proteins appears as independent component of carbonyl stress in serum of diabetic nephropathy patients. The aldehyde incorporation was abolished in the microsomal peroxidation NADPH-dependent through the use of sodium bisulfite, an efficient nuclephile agent that removes aldehyde groups by attacking the carbon atom of the carbonyl group. Additionally, the intense aldehyde-capture derived from the microsomal peroxidation helps us to find the source of these particular aldehydes in the unsaturated fatty acids derived from membrane phospholipids.
The oxidation of biomolecules such as carbohydrates and lipids and/or the inadequate detoxification of carbonyl compounds may contribute to the progression of complications of end-stage renal disease . A better understanding of the nature of carbonyl stress in diabetic glomerular lesions would help in the search for novel approaches to confront diabetic renal damage. Additionally, if the generation of reactive carbonyl compounds is not only secondary to oxidative stress but also an active contributor to the renal disease pathogenesis, as has been suggested [31, 32], an inhibition of protein carbonylation reaction might be relevant, and the approaches to measuring the aldehydes abundance might be very useful in the development of new treatment strategies.
From the results obtained we can corroborate the importance of unsaturated aldehydes in the uremic plasma as an independent parameter of carbonyl stress. In addition, we are in a position to propose an alternative explanation of why alkalinization of urine attenuates rhabdomyolysis-induced renal dysfunction [33–35]. Although one acceptable explanation is that alkalinization enhances the myoglobin (Mb) solubility  and that lipid peroxidation reactions are accelerated at acidic pH [35, 36], a plausible alternative can be deduced from data presented here, suggesting that alpha-beta-unsaturated compounds condensation catalyzed at alkaline pH could reduce renal dysfunctions during rabdomyolisis. It is possible to suppose that polymerization of reactive aldehydes represents a way to block carbonyl groups in large amounts and promote carbonyl stress amelioration.
Materials and methods
Unless noted otherwise, biochemicals were obtained from Sigma Chemical Co., St. Louis, MO; albumin from bovine serum (BSA) (fraction V, lyophilized powder 98%); albumin from human serum (lyophilized powder 99%); 2, 4-dinitrophenylhydrazine (DNPH); ethylenediaminetetraacetic acid (EDTA); guanidine hydrochloride; acrolein (2-propenal) 99%, sodium bisulfite (sodium hydrogensulfite ≥ 99%) and sodium hydroxide (Sigma Ultra 98%); nicotinamide; adenosine 5'- diphosphate sodium salt (ADP), ferric Chloride (FeCl3) and β-Nicotinamide adenine dinucleotide phosphate reduced form (β-NADPH).
Serum aliquots of diabetic patients of the Unit of Nephrology at General Hospital # 80 of the Mexican Institute of Social Security, Morelia, Michoacán, México were collected from samples that were used in the periodic clinical examinations. Control serum samples were collected from individuals recruited for blood donations. All patients received and gave both oral and written informed consent for the use of the aliquot samples. Blood samples were obtained in the morning after fasting by venipuncture in tubes without anticoagulant. Serum (21 controls and 18 diabetic with nephropathy) was stored at -30°C and in all cases was used 3 days after being collected. Animal samples. Hepatic tissue from Sprague Dowley male rats weighing 200-250 g was used. Animal procedures and management were made in accordance with the National Institute of Health Guide for the Care and Use of Laboratory Animals and approved by the Ethics Committee of the Mexican Institute of Social Security.
Acrolein capture by albumin and protein adducts (Aldol-proteins) measurement
Standard preparation. An adduct acrolein-albumin standard curve was prepared as follows: 5 mg of human or bovine serum albumin was dissolved completely in 5 ml PBS and then incubated at room temperature with acrolein (10 μM final concentration), 100 μl of 0.01 mM EDTA and 100 μl of a 1% sodium hydroxide solution. Aldolic condensates were formed this way in a time dependent manner (Figure 1). The reaction mixture was neutralized with HCL (2N) and dialyzed overnight against PBS at 4°C. Aliquots containing increasing amounts of protein were precipitated using 30% ZnSO4 and centrifuged 15 minutes at 5, 000 g; the pellets were dissolved with 6M guanidine hydrochloride and incubated at 37°C for 2 hours with occasional vortex mixing. The absorbance of each aliquot was read with a spectrophotometer at 266 nm (aldolic condensation) against a blank of only guanidine hydrochloride 6M. The standard curve performed represents the linear relationship between the protein-acrolein adducts concentration or aldol-protein abundance and the absorbance at 266 nm (Figure 2, aldol-protein). Different alpha-beta unsaturated incubated with albumin and aldehydes in protein-free solutions present strong absorbance at 266 nm, although acrolein showed the maximal efficiency in adduct formation [27, 28].
Parallel standard curves were made in the same conditions with only albumin and albumin plus acrolein without the addition of sodium hydroxide (Figure 2, albumin and albumin plus acrolein). The standard curves performed in this way correspond to the indirect absorbance of albumin (and albumin plus acrolein) at 266 nm, as a consequence of its intrinsic absorbance at 280 nm.
Sample procedure. Serum samples (15 μl) dissolved in 50 μl of PBS, 25 μl of 0.1 mM EDTA and 50 μl of 1% sodium hydroxide were incubated for 20 minutes at 37°C. At the end of incubation, samples were precipitated with 50 μl of ZnSO4 30%, dissolved with an additional 500 μl of PBS and centrifuged for 15 minutes at 5000 g. Pellets were washed two more times with 0.5 ml of PBS and finally dissolved with 6M guanidine hydrochloride and incubated at 37°C for 2 hours with occasional vortex mixing. The absorbances of the samples were read with a spectrophotometer at 266 nm against a blank of only guanidine hydrochloride 6M, as explained previously.
Protein concentration was determined by the Bradford reagent and then the concentration used of each sample was adjusted with PBS. To the final concentration of protein in guanidine, standard curves of Bradford procedure were carried out substituting the vehicle by guanidine 2M and taking aliquot of 10 μl of protein guanidine samples.
Using the absorbances of 266 nm and the slopes of the standard curves described previously (Figure 2) the Aldol-Protein concentration can be calculated as follows:
Aldol-Protein = (Abs 266 nm - F) (N2), where F is the calculated absorbance of albumin + acrolein mix (no aldol) at 266 nm and N2 corresponds to the slope of the aldol-protein adduct standard curve.
F = (Abs 266 nm) (N1) - (Abs 266 nm) (N2)/(N1), where N1 and N2 are the slopes of the standard curves of albumin + acrolein mix (no aldol) and aldol-protein respectively (1851 and 411 for the standard curves presented in Figure 2)
Microsomal peroxidation catalyzed by NADPH
Microsomes. Hepatic tissue from Sprague Dowley rats was homogenized in 25 M sucrose. The homogenate was placed in a centrifuge tube and an equivalent volume of 0.34 M sucrose was layered underneath. The discontinuous gradient thus formed was centrifuged for 10 minutes at 700 × g, and before eliminating the crude nuclei, the supernatant was centrifuged 10 minutes at 15, 000 × g. The precipitate (crude mitochondrial fraction) was discarded and the supernatant centrifuged at 105, 000 × g for 60 minutes. The crude microsomal fraction resultant was re-suspended in KCL 125 mM (1 ml of solution/g of liver used for the preparation) for a concentration of 12.0 mg of microsomal protein/mL).
Microsomal Peroxidation. The induction of lipid peroxidation on microsomal membranes was carried out with a controlled system described previously [37, 38] and with a reaction mix containing 20 mM nicotinamide, 2 mM ADP, 0.12 mM FeCl3, and 0.4 mM NADPH in a 80 mM KCl solution. The control samples without peroxidation were prepared as previously described but without the addition of NADPH (Figure 3, MICROSOMES NO PEROXIDATION). In the experimental procedure to inhibit lipid peroxidation by blocking the carbonyl groups, sodium bisulfite (0.01 μM) was added to the reaction mix at the end of the incubation time (1 h). The pH of the samples had been previously neutralized.
Protein Carbonyl Measurement
Protein carbonyl determination was carried out in accordance with previous reports . Protein samples containing 6 mg/ml of protein were re-suspended in 1 ml of 10 mM 2, 4-dinitrophenylhydrazine (DNPH) in 2 M HCl. The samples were incubated at laboratory temperature in the dark for 60 min, stirring at 15-minute intervals. The samples that had been previously precipitated with trichloroacetic acid (20%), centrifuged at 11, 000 × g for 10 minutes and re-suspended with a pulse of sonication, were washed three times with 1 mL of ethanol-ethyl acetate (1:1; v/v) to remove the residual DNPH reagent. The final precipitates were dissolved in 6 N guanidine hydrochloride solution (1 mL). The protein carbonyl content was determined by measuring the absorbance of the protein-2, 4 dinitrophenylhydrazone derivatives at 375 nm, using a molar absorption coefficient of 22, 000 M-1 cm-1.
Results were expressed as mean ± standard deviation (SD). Groups were compared using one way ANOVA test followed by Dunet's test.
This study was supported by a grant from the Fondo de Investigación en Salud FIS/IMSS/PROT/G10/854 and a grant from Consejo Nacional de Ciencia y Tecnología (CONACYT) SALUD-2010-01-141937 FIS/IMSS/PROT/896
- Grune T, Reinheckel T, Davies KJ: Degradation of oxidized proteins in mammalian cells. FASEB J. 1997, 11: 526-534.PubMedGoogle Scholar
- Dean RT, Fu S, Stocker R, Davies MJ: Biochemistry and pathology of radical-mediated protein oxidation. Biochem J. 1997, 324: 1-18.PubMed CentralView ArticlePubMedGoogle Scholar
- Reznick AZ, Packer L: Oxidative damage to proteins: spectrophotometric method for carbonyl assay. Methods Enzymol. 1994, 233: 357-363.View ArticlePubMedGoogle Scholar
- Stadtman ER, Starke-Reed PE, Oliver CN, Carney JM, Floyd RA: Protein modification in aging. EXS. 1992, 62: 64-72.PubMedGoogle Scholar
- Stadtman ER: Protein oxidation and aging. Science. 1992, 257: 1220-1224. 10.1126/science.1355616View ArticlePubMedGoogle Scholar
- Levine RL, Williams JA, Stadtman ER, Shacter E: Carbonyl assays for determination of oxidatively modified proteins. Methods Enzymol. 1994, 233: 346-357.View ArticlePubMedGoogle Scholar
- Levine RL, Wehr N, Williams JA, Stadtman ER, Shacter E: Determination of carbonyl groups in oxidized proteins. Methods Mol Biol. 2000, 99: 15-24.PubMedGoogle Scholar
- Stadtman ER, Oliver CN: Metal-catalyzed oxidation of proteins. Physiological consequences. J Biol Chem. 1991, 266: 2005-2008.PubMedGoogle Scholar
- Leeuwenburgh C, Hansen P, Shaish A, Holloszy JO, Heinecke JW: Markers of protein oxidation by hydroxyl radical and reactive nitrogen species in tissues of aging rats. Am J Physiol. 1998, 274: R453-R461.PubMedGoogle Scholar
- Hazell LJ, van den Berg JJ, Stocker R: Oxidation of low-density lipoprotein by hypochlorite causes aggregation that is mediated by modification of lysine residues rather than lipid oxidation. Biochem J. 1994, 302: 297-304.PubMed CentralView ArticlePubMedGoogle Scholar
- Cross CE, Reznick AZ, Packer L, Davis PA, Suzuki YJ, Halliwell B: Oxidative damage to human plasma proteins by ozone. Free Radic Res Commun. 1992, 15: 347-352. 10.3109/10715769209049150View ArticlePubMedGoogle Scholar
- Halliwell B, Gutteridge JM: Free Radicals in Biology and Medicine. 2007, Clarendon Press, Oxford, USA, 4,Google Scholar
- Burcham PC, Kuhan YT: Introduction of carbonyl groups into proteins by the lipid peroxidation product, malondialdehyde. Biochem Biophys Res Commun. 1996, 220: 996-1001. 10.1006/bbrc.1996.0521View ArticlePubMedGoogle Scholar
- Blakeman DP, Ryan TP, Jolly RA, Petry TW: Diquat-dependent protein carbonyl formation. Identification of lipid-dependent and lipid-independent pathways. Biochem Pharmacol. 1995, 50: 929-935. 10.1016/0006-2952(95)00214-KView ArticlePubMedGoogle Scholar
- Miyata T, van Ypersele de Strihou C, Kurokawa K, Baynes JW: Alterations in nonenzymatic biochemistry in uremia: origin and significance of "carbonyl stress" in long-term uremic complications. Kidney Int. 1999, 55: 389-399. 10.1046/j.1523-1755.1999.00302.xView ArticlePubMedGoogle Scholar
- Miyata T, Izuhara Y, Sakai H, Kurokawa K: Carbonyl stress: increased carbonyl modification of tissue and cellular proteins in uremia. Perit Dial Int. 1999, 19: S58-S61.PubMedGoogle Scholar
- Miyata T, Wada Y, Cai Z, Iida Y, Horie K, Yasuda Y, Maeda K, Kurokawa K, van Ypersele de Strihou C: Implication of an increased oxidative stress in the formation of advanced glycation end products in patients with end-stage renal failure. Kidney Int. 1997, 51: 1170-1181. 10.1038/ki.1997.160View ArticlePubMedGoogle Scholar
- Holt S, Moore K: Pathogenesis of renal failure in rhabdomyolysis: the role of myoglobin. Exp Nephrol. 2000, 8: 72-76. 10.1159/000020651View ArticlePubMedGoogle Scholar
- Holt S, Reeder B, Wilson M, Harvey S, Morrow JD, Roberts LJ, Moore K: Increased lipid peroxidation in patients with rhabdomyolysis. Lancet. 1999, 353: 1241-View ArticlePubMedGoogle Scholar
- Esterbauer H, Schaur RJ, Zollner H: Chemistry and biochemistry of 4-hydroxynonenal, malonaldehyde and related aldehydes. Free Radic Biol Med. 1991, 11: 81-128. 10.1016/0891-5849(91)90192-6View ArticlePubMedGoogle Scholar
- LoPachin RM, Gavin T, Geohagen BC, Das S: Neurotoxic mechanisms of electrophilic type-2 alkenes: soft interactions described by quantum mechanical parameters. Toxicol Sci. 2007, 98: 561-570. 10.1093/toxsci/kfm127View ArticlePubMedGoogle Scholar
- LoPachin RM, Barber DS, Gavin T: Molecular mechanisms of the conjugated alpha, beta-unsaturated carbonyl derivatives: relevance to neurotoxicity and neurodegenerative diseases. Toxicol Sci. 2008, 104: 235-249.PubMed CentralView ArticlePubMedGoogle Scholar
- Medina-Navarro R, Duran-Reyes G, Diaz-Flores M, Hicks JJ, Kumate J: Glucose-stimulated acrolein production from unsaturated fatty acids. Hum Exp Toxicol. 2004, 23: 101-105. 10.1191/0960327104ht416oaView ArticlePubMedGoogle Scholar
- Medina-Navarro R, Durán-Reyes G, Díaz-Flores M, Kumate J, Hicks JJ: Glucose autoxidation produce acrolein from lipid peroxidation in vitro. Clin Chim Acta. 2003, 337: 183-185. 10.1016/j.cccn.2003.07.005View ArticlePubMedGoogle Scholar
- Cockcroft DW, Gault MH: Prediction of creatinine clearance from serum creatinine. Nephron. 1976, 16: 31-41. 10.1159/000180580View ArticlePubMedGoogle Scholar
- Requena JR, Fu MX, Ahmed MU, Jenkins AJ, Lyons TJ, Baynes JW, Thorpe SR: Quantification of malondialdehyde and 4-hydroxynonenal adducts to lysine residues in native and oxidized human low-density lipoprotein. Biochem J. 1997, 322: 317-325.PubMed CentralView ArticlePubMedGoogle Scholar
- Halliwell B, Chirico S: Lipid peroxidation: its mechanism measurement, and significance. Am J Clin Nutr. 1993, 57: 715S-724S.PubMedGoogle Scholar
- Moore K, Roberts LJ: Measurement of lipid peroxidation. Free Radic Res. 1998, 28: 659-671. 10.3109/10715769809065821View ArticlePubMedGoogle Scholar
- Michel F, Bonnefont-Rousselot D, Mas E, Drai J, Thérond P: Biomarkers of lipid peroxidation: analytical aspects. Ann Biol Clin. 2008, 66: 605-620.Google Scholar
- Zoccali C, Mallamaci F, Tripepi G: AGEs and carbonyl stress: potential pathogenetic factors of long-term uraemic complications. Nephrol Dial Transplant. 2000, 15: 7-11. 10.1093/ndt/15.suppl_1.7View ArticlePubMedGoogle Scholar
- Miyata T, Fu MX, Kurokawa K, van Ypersele de Strihou C, Thorpe SR, Baynes JW: Products of autoxidation of both carbohydrates and lipids are increased in uremic plasma: evidence for a generalized increase in oxidative stress in uremia?. Kidney Int. 2000, 54: 1290-1295.View ArticleGoogle Scholar
- Miyata T, Ueda Y, Yamada Y, Izuhara Y, Wada T, Jadoul M, Saito A, Kurokawa K, van Ypersele de Strihou C: Accumulation of carbonyls accelerates the formation of pentosidine, an advanced glycation end product: carbonyl stress in uremia. Am Soc Nephrol. 1998, 9: 2349-2356.Google Scholar
- Better OS, Stein JH: Early management of shock and prophylaxis of acute renal failure in traumatic rhabdomyolysis. N Engl J Med. 1990, 322: 825-829. 10.1056/NEJM199003223221207View ArticlePubMedGoogle Scholar
- Zager RA: Studies of mechanisms and protective maneuvers in myoglobinuric acute renal injury. Lab Invest. 1989, 60: 619-629.PubMedGoogle Scholar
- Rodríguez-Malaver AJ, Leake DS, Rice-Evans CA: The effects of pH on the oxidation of low-density lipoprotein by copper and metmyoglobin are different. FEBS Lett. 1997, 406: 37-41. 10.1016/S0014-5793(97)00233-0View ArticlePubMedGoogle Scholar
- Moore KP, Holt SG, Patel RP, Svistunenko DA, Zackert W, Goodier D, Reeder BJ, Clozel M, Anand R, Cooper CE, Morrow JD, Wilson MT, Roberts LJ: A causative role for redox cycling of myoglobin and its inhibition by alkalinization in the pathogenesis and treatment of rhabdomyolysis-induced renal failure. J Biol Chem. 1998, 273: 31731-31737. 10.1074/jbc.273.48.31731View ArticlePubMedGoogle Scholar
- Wills ED: Lipid peroxide formation in microsomes. General considerations. Biochem J. 1996, 113: 315-324.View ArticleGoogle Scholar
- Hicks JJ, Medina-Navarro R: Inhibitory capacity of human serum on induced microsomal lipoperoxidation. Arch Med Res. 1995, 26: 169-172.PubMedGoogle Scholar
- Levine RL: Carbonyl modified proteins in cellular regulation, aging, and disease. Free Radic Biol. 2002, 32: 790-796. 10.1016/S0891-5849(02)00765-7.View ArticleGoogle Scholar
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