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Wang M, Wang J, Wang J, Wu Y, Qi X. Elevated ALOX12 in renal tissue predicts progression in diabetic kidney disease. Ren Fail 2024; 46:2313182. [PMID: 38345057 PMCID: PMC10863531 DOI: 10.1080/0886022x.2024.2313182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 01/27/2024] [Indexed: 02/15/2024] Open
Abstract
Diabetic kidney disease (DKD) is one of the major causes of end-stage renal disease and one of the significant complications of diabetes. This study aims to identify the main differentially expressed genes in DKD from transcriptome sequencing results and analyze their diagnostic value. The present study sequenced db/m mouse and db/db mouse to determine the ALOX12 genetic changes related to DKD. After preliminary validation, ALOX12 levels were significantly elevated in the blood of DKD patients, but not during disease progression. Moreover, urine ALOX12 was increased only in macroalbuminuria patients. Therefore, to visualize the diagnostic efficacy of ALOX12 on the onset and progression of renal injury in DKD, we collected kidney tissue from patients for immunohistochemical staining. ALOX12 was increased in the kidneys of patients with DKD and was more elevated in macroalbuminuria patients. Clinical chemical and pathological data analysis indicated a correlation between ALOX12 protein expression and renal tubule injury. Further immunofluorescence double staining showed that ALOX12 was expressed in both proximal tubules and distal tubules. Finally, the diagnostic value of the identified gene in the progression of DKD was assessed using receiver operating characteristic (ROC) curve analysis. The area under the curve (AUC) value for ALOX12 in the diagnosis of DKD entering the macroalbuminuria stage was 0.736, suggesting that ALOX12 has good diagnostic efficacy. During the development of DKD, the expression levels of ALOX12 in renal tubules were significantly increased and can be used as one of the predictors of the progression to macroalbuminuria in patients with DKD.
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Affiliation(s)
- Meixi Wang
- Department of Nephropathy, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Jingjing Wang
- Department of Nephropathy, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Jinni Wang
- Department of Nephropathy, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Yonggui Wu
- Department of Nephropathy, The First Affiliated Hospital of Anhui Medical University, Hefei, China
- Center for Scientific Research of Anhui Medical University, Hefei, China
| | - Xiangming Qi
- Department of Nephropathy, The First Affiliated Hospital of Anhui Medical University, Hefei, China
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2
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Kourtidou C, Stangou M, Marinaki S, Tziomalos K. Novel Cardiovascular Risk Factors in Patients with Diabetic Kidney Disease. Int J Mol Sci 2021; 22:ijms222011196. [PMID: 34681856 PMCID: PMC8537513 DOI: 10.3390/ijms222011196] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 10/09/2021] [Accepted: 10/15/2021] [Indexed: 02/06/2023] Open
Abstract
Patients with diabetic kidney disease (DKD) are at very high risk for cardiovascular events. Only part of this increased risk can be attributed to the presence of diabetes mellitus (DM) and to other DM-related comorbidities, including hypertension and obesity. The identification of novel risk factors that underpin the association between DKD and cardiovascular disease (CVD) is essential for risk stratification, for individualization of treatment and for identification of novel treatment targets.In the present review, we summarize the current knowledge regarding the role of emerging cardiovascular risk markers in patients with DKD. Among these biomarkers, fibroblast growth factor-23 and copeptin were studied more extensively and consistently predicted cardiovascular events in this population. Therefore, it might be useful to incorporate them in risk stratification strategies in patients with DKD to identify those who would possibly benefit from more aggressive management of cardiovascular risk factors.
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Affiliation(s)
- Christodoula Kourtidou
- First Propedeutic Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, AHEPA Hospital, 54636 Thessaloniki, Greece;
- Correspondence:
| | - Maria Stangou
- Department of Nephrology, Medical School, Aristotle University of Thessaloniki, Hippokration Hospital, 54642 Thessaloniki, Greece;
| | - Smaragdi Marinaki
- Department of Nephrology and Renal Transplantation, Medical School, National and Kapodistrian University of Athens, Laiko Hospital, 11527 Athens, Greece;
| | - Konstantinos Tziomalos
- First Propedeutic Department of Internal Medicine, Medical School, Aristotle University of Thessaloniki, AHEPA Hospital, 54636 Thessaloniki, Greece;
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3
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The biological role of arachidonic acid 12-lipoxygenase (ALOX12) in various human diseases. Biomed Pharmacother 2020; 129:110354. [DOI: 10.1016/j.biopha.2020.110354] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 05/20/2020] [Accepted: 06/01/2020] [Indexed: 12/18/2022] Open
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4
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Dong C, Liu S, Cui Y, Guo Q. 12-Lipoxygenase as a key pharmacological target in the pathogenesis of diabetic nephropathy. Eur J Pharmacol 2020; 879:173122. [DOI: 10.1016/j.ejphar.2020.173122] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2020] [Revised: 04/07/2020] [Accepted: 04/17/2020] [Indexed: 12/18/2022]
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5
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Gao XQ, Fei F, Huo HH, Huang B, Meng XS, Zhang T, Liu BL. Effect of acute exposure to nitrite on physiological parameters, oxidative stress, and apoptosis in Takifugu rubripes. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 188:109878. [PMID: 31704330 DOI: 10.1016/j.ecoenv.2019.109878] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 10/16/2019] [Accepted: 10/25/2019] [Indexed: 06/10/2023]
Abstract
In the present study, we evaluated the effects of nitrite exposure on hematological parameters, oxidative stress, and apoptosis in juvenile Takifugu rubripes. The fish were exposed to nitrite (0, 0.5, 1, 3, and 6 mM) for up to 96 h. In the high nitrite concentration groups (i.e., 3 and 6 mM), the concentrations of methemoglobin (MetHb), cortisol, glucose, heat shock protein (Hsp)-70, Hsp-90, and potassium (K+) were significantly elevated. Whereas, the concentrations of hemoglobin (Hb), triglyceride (TG), total cholesterol (TC), and sodium (Na+) and chloride (Cl-) ions were significantly decreased. Compared with those of the control groups, the concentrations of the antioxidant enzymes, namely, superoxide dismutase (SOD), catalase (CAT), glutathione (GSH), and glutathione peroxidase (GPx), in the gills were considerably elevated at 12 and 24 h after exposure to nitrite (1, 3, and 6 mM), but reduced at 48 and 96 h. The increase in the antioxidant enzymes may contribute to the elimination of reactive oxygen species (ROS) induced by nitrite during early nitrite exposure, when the antioxidant system is not sufficiently effective to eliminate or neutralize excessive ROS. In addition, we found that nitrite exposure could alter the expression patterns of some key apoptosis-related genes (Caspase-3, Caspase-8, Caspase-9, p53, Bax, and Bcl-2). This indicated that the caspase-dependent apoptotic pathway and p53-Bax-Bcl-2 pathway might be involved in apoptosis induced by nitrite exposure. Furthermore, our study provides insights into how acute nitrite exposure affects the physiological responses and potential molecular mechanism of apoptosis in marine fish. The results can help elucidate the mechanisms involved in nitrite-induced aquatic toxicology in marine fish.
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Affiliation(s)
- Xiao-Qiang Gao
- Key Laboratory for Sustainable Development of Marine Fisheries, Ministry of Agriculture, Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, People's Republic of China
| | - Fan Fei
- Key Laboratory for Sustainable Development of Marine Fisheries, Ministry of Agriculture, Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, People's Republic of China; Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian Ocean University, Dalian, People's Republic of China
| | - Huan Huan Huo
- College of Animal Science and Technology, Jiangxi Agricultural University, NanChang, 330045, People's Republic of China
| | - Bin Huang
- Key Laboratory for Sustainable Development of Marine Fisheries, Ministry of Agriculture, Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, People's Republic of China
| | - Xue Song Meng
- Dalian Tianzheng Industrial Co. Ltd., Dalian, 116000, People's Republic of China
| | - Tao Zhang
- Dalian Tianzheng Industrial Co. Ltd., Dalian, 116000, People's Republic of China
| | - Bao-Liang Liu
- Key Laboratory for Sustainable Development of Marine Fisheries, Ministry of Agriculture, Qingdao Key Laboratory for Marine Fish Breeding and Biotechnology, Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, 266071, People's Republic of China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, People's Republic of China.
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6
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Tsekmekidou XA, Kotsa KD, Tsetsos FS, Didangelos TP, Georgitsi MA, Roumeliotis AK, Panagoutsos SA, Thodis ED, Theodoridis MT, Papanas NP, Papazoglou DA, Pasadakis PS, Eustratios MS, Paschou PI, Yovos JG. Assessment of association between lipoxygenase genes variants in elderly Greek population and type 2 diabetes mellitus. Diab Vasc Dis Res 2018; 15:340-343. [PMID: 29392977 DOI: 10.1177/1479164118756241] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Inflammation plays a pivotal role in the pathogenesis of diabetes and its complications. Arachidonic acid lipoxygenases have been intensively studied in their role in inflammation in metabolic pathways. Thus, we aimed to explore variants of lipoxygenase genes (arachidonate lipoxygenase genes) in a diabetes adult population using a case-control study design. METHODS Study population consisted of 1285 elderly participants, 716 of whom had type 2 diabetes mellitus. The control group consisted of non-diabetes individuals with no history of diabetes history and with a glycated haemoglobin <6.5% (<48 mmol/mol)] and fasting plasma glucose levels <126 mg/dL. Blood samples were genotyped on Illumina Infinium PsychArray. Variants of ALOX5, ALOX5AP, ALOX12, ALOX15 were selected. All statistical analyses were undertaken within PLINK and SPSS packages utilising permutation analysis tests. RESULTS Our findings showed an association of rs9669952 (odds ratio = 0.738, p = 0.013) and rs1132340 (odds ratio = 0.652, p = 0.008) in ALOX5AP and rs11239524 in ALOX5 gene with disease (odds ratio = 0.808, p = 0.038). Rs9315029 which is located near arachidonate ALOX5AP also associated with type 2 diabetes mellitus ( p = 0.025). No variant of ALOX12 and ALOX15 genes associated with disease. CONCLUSION These results indicate a potential protective role of ALOX5AP and 5-arachidonate lipoxygenase gene in diabetes pathogenesis, indicating further the importance of the relationship between diabetes and inflammation. Larger population studies are required to replicate our findings.
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Affiliation(s)
- Xanthippi A Tsekmekidou
- 1 Division of Endocrinology and Metabolism-Diabetes Center, 1st Internal Medicine Department, Medical School, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Kalliopi D Kotsa
- 1 Division of Endocrinology and Metabolism-Diabetes Center, 1st Internal Medicine Department, Medical School, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Fotis S Tsetsos
- 2 Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
| | - Triantafyllos P Didangelos
- 3 Diabetes Center, 1st Propedeutic Internal Medicine Department, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - Marianthi A Georgitsi
- 2 Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
- 4 Laboratory of General Biology-Genetics, Department of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | | | | | - Elias D Thodis
- 5 Department of Nephrology, Democritus University of Thrace, Alexandroupolis, Greece
| | - Marios T Theodoridis
- 5 Department of Nephrology, Democritus University of Thrace, Alexandroupolis, Greece
| | - Nikolaos P Papanas
- 6 Diabetes Centre, Second Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece
| | - Dimitrios A Papazoglou
- 6 Diabetes Centre, Second Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece
| | - Ploumis S Pasadakis
- 5 Department of Nephrology, Democritus University of Thrace, Alexandroupolis, Greece
| | - Maltezos S Eustratios
- 6 Diabetes Centre, Second Department of Internal Medicine, Democritus University of Thrace, Alexandroupolis, Greece
| | - Peristera I Paschou
- 2 Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
| | - John G Yovos
- 1 Division of Endocrinology and Metabolism-Diabetes Center, 1st Internal Medicine Department, Medical School, AHEPA University Hospital, Aristotle University of Thessaloniki, Thessaloniki, Greece
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7
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Roumeliotis AK, Roumeliotis SK, Panagoutsos SA, Tsetsos F, Georgitsi M, Manolopoulos V, Paschou P, Passadakis PS. Association of ALOX12 gene polymorphism with all-cause and cardiovascular mortality in diabetic nephropathy. Int Urol Nephrol 2017; 50:321-329. [PMID: 29196930 DOI: 10.1007/s11255-017-1755-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 11/20/2017] [Indexed: 10/18/2022]
Abstract
PURPOSE Cardiovascular (CV) events are the first cause of death in patients with chronic renal disease (CKD) and in patients with type 2 diabetes mellitus (DM2). The combination of CKD and DM2 elevates the risk of both cardiovascular disease (CVD) and death in this high-risk population. Besides traditional risk factors, such as dyslipidemia, smoking, obesity, and carotid atherosclerosis, novel factors are under investigation such as genetic polymorphisms. Lipoxygenases (LOXs) and their genes are of critical importance in oxidative stress, inflammation, and atherosclerosis. The aim of the study is to clarify a potential ALOX12 role in CVD presence and progress of diabetic patients in different stages of nephropathy. METHODS We studied 145 patients with a documented history of DM2 for at least 10 years and diabetic nephropathy (DN), mean age 68 ± 9 years, body mass index 31 ± 5 kg/m2, and different stages of renal disease, depending on glomerular filtration rate. The sample population consisted of two groups: 108 DM2 patients with DN in all five stages of CKD and 37 DM2 patients as controls. Anthropometric and clinical characteristics, interview for history of previous CV event, and assessment of carotid intima-media thickness (cIMT) were recorded at baseline. All patients were genotyped for ALOX12 polymorphisms with focus on rs14309. Genotypes (AA, AG, and GG) were evaluated for any possible role in CVD, and grouping was performed on A genotype, which is the dominant model. All participants were followed over a period of 7 years, and the end points studied were all-cause mortality, CV mortality, and CV events. CV events were defined as myocardial infarction (MI), stroke, or peripheral artery disease. RESULTS The GG genotype has been significantly associated with cIMT levels above 0.86 mm and with history of MI. Regarding the presence of an atherosclerotic plaque in either carotid artery, no significant association was found when the genotypes were assessed on their own. After grouping, though, GG genotype revealed a significant association between carotid plaque formation and atheromatosis. Kaplan-Meier analysis revealed that ALOX12 gene GG genotype predicted all-cause mortality, CV mortality, and CV events. Similarly, when AA and AG genotypes were grouped, Kaplan-Meier analysis showed that patients with GG genotype presented an even more significant higher all-cause mortality, CV mortality, and CV events compared with AA and AG genotypes combined. After adjustment for several traditional risk factors, multivariate Cox proportional hazard analysis showed that patients with the GG genotype had a significant higher risk of all-cause mortality, a threefold increase in CV mortality, and a twofold increased risk for CV events compared to patients with the AA or the AG genotype. CONCLUSION ALOX12 rs14309 GG genotype expression was found to be significantly associated with MI, higher cIMT, increased CV events, CV, and overall mortality. This phenomenon could be partially explained by the increased platelet proaggregatory activity of AA products and the control they exert in thrombotic occurrence and plaque formation.
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Affiliation(s)
- Athanasios K Roumeliotis
- Department of Nephrology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
| | - Stefanos K Roumeliotis
- Department of Nephrology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
| | - Stylianos A Panagoutsos
- Department of Nephrology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece.
| | - Fotis Tsetsos
- Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
| | - Marianthi Georgitsi
- Department of Medicine, Aristotle University of Thessaloniki, Thessaloníki, Greece
| | - Vangelis Manolopoulos
- Laboratory of Pharmacology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
| | - Peristera Paschou
- Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
| | - Ploumis S Passadakis
- Department of Nephrology, Medical School, Democritus University of Thrace, Alexandroupolis, Greece
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8
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Franko B, Benhamou PY, Genty C, Jouve T, Nasse L, Rzeoecki V, Semeraro P, Stasia MJ, Zaoui P. RAGE and CYBA polymorphisms are associated with microalbuminuria and end-stage renal disease onset in a cohort of type 1 diabetes mellitus patients over a 20-year follow-up. Acta Diabetol 2016; 53:469-75. [PMID: 26607824 DOI: 10.1007/s00592-015-0820-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 11/09/2015] [Indexed: 11/30/2022]
Abstract
AIMS We investigated the association of polymorphisms of three genes implicated in oxidative stress: CYBA C242T, RAGE -374T/A and -429T/C, and ALOX12 Arg261Gln, with the delay of microalbuminuria onset in patients with type 1 diabetes mellitus (DT1). METHODS A total of 162 T1D patients presenting with diabetes for 32.9 ± 9 years were included in the study; 53 had persistent microalbuminuria (>30 mg/l) and 109 did not. Onset of diabetes, microalbuminuria and end-stage renal disease (ESRD) were recorded as bio-clinical data. We determined polymorphism association of microalbuminuria with a Cox regression model. RESULTS All polymorphisms respected the Hardy-Weinberg equilibrium. The Cox regression model validated four significant variables associated with microalbuminuria: RAGE 374AA (HR 4.19 [1.84-9.58] (p = 0.001)), CYBA TT+TC (HR 2.1 [1.16-3.80], p = 0.015), male sex (HR 1.92 [1.07-3.43], p = 0.028) and diabetes diagnosis at the pediatric stage (HR 1.85 [1.03-3.32], p = 0.039). The same association was found with ESRD (p = 0.028 and p = 0.033 for CYBA TC+TT and RAGE 374AA, respectively). CYBA C242T and RAGE 374T/A were not significantly associated with diabetic retinopathy. CONCLUSIONS CYBA C242T and RAGE -374T/A correlate with microalbuminuria onset in the French DT1 cohort. The same correlation with ESRD onset supports the argument for the involvement of a genetic predisposition involving kidney-specific oxidative stress for diabetic nephropathy.
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Affiliation(s)
- Benoit Franko
- Department of Nephrology, Nephrology Clinic, Grenoble University Hospital, Grenoble, 38043, France.
- Chronic Granulomatous Disease Diagnosis and Research Centre, Therex-TIMC/Imag, UMR CNRS 5525, UJF-Grenoble 1, Université Grenoble Alpes, Grenoble, 38041, France.
| | - Pierre-Yves Benhamou
- Department of Endocrinology, Grenoble University Hospital, Grenoble, 38043, France
| | - Céline Genty
- UJF-Grenoble 1/CNRS/Clinical Research Centre-Inserm CIC03/TIMC-IMAG UMR 5525/Themas, Grenoble University Hospital, Grenoble, France
| | - Thomas Jouve
- Department of Nephrology, Nephrology Clinic, Grenoble University Hospital, Grenoble, 38043, France
| | - Laure Nasse
- Department of Endocrinology, Grenoble University Hospital, Grenoble, 38043, France
| | - Vincent Rzeoecki
- Chronic Granulomatous Disease Diagnosis and Research Centre, Therex-TIMC/Imag, UMR CNRS 5525, UJF-Grenoble 1, Université Grenoble Alpes, Grenoble, 38041, France
| | - Paul Semeraro
- Chronic Granulomatous Disease Diagnosis and Research Centre, Therex-TIMC/Imag, UMR CNRS 5525, UJF-Grenoble 1, Université Grenoble Alpes, Grenoble, 38041, France
| | - Marie José Stasia
- Chronic Granulomatous Disease Diagnosis and Research Centre, Therex-TIMC/Imag, UMR CNRS 5525, UJF-Grenoble 1, Université Grenoble Alpes, Grenoble, 38041, France
- CGD Centre, BEP/DBTP/Pôle Biologie, CHU de Grenoble, Grenoble, 38043, France
| | - Philippe Zaoui
- Department of Nephrology, Nephrology Clinic, Grenoble University Hospital, Grenoble, 38043, France
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Xu HZ, Cheng YL, Wang WN, Wu H, Zhang YY, Zang CS, Xu ZG. 12-Lipoxygenase Inhibition on Microalbuminuria in Type-1 and Type-2 Diabetes Is Associated with Changes of Glomerular Angiotensin II Type 1 Receptor Related to Insulin Resistance. Int J Mol Sci 2016; 17:ijms17050684. [PMID: 27164093 PMCID: PMC4881510 DOI: 10.3390/ijms17050684] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 04/18/2016] [Accepted: 04/27/2016] [Indexed: 01/06/2023] Open
Abstract
(1) BACKGROUND: 12-lipoxygenase (12-LO) is involved in the development of diabetic nephropathy (DN). In the present study, we investigated whether 12-LO inhibition may ameliorate type-2 DN (T2DN) by interfering with insulin resistance (IR); (2) METHODS: Rat glomerular mesangial cells, glomeruli and skeletal muscles were isolated and used in this study. Kidney histological changes were confirmed by periodic-acid Schiff staining; mRNA expression was detected by competitive reverse transcription polymerase chain reaction; and the protein level was determined by Western blot and the enzyme-linked immunosorbent assay, respectively; (3) RESULTS: The inhibition of 12-LO attenuated microalbuminuria (MAU) increases in type-2 diabetic rats, but not in type-1 diabetic rats. Infusion of 12(S)-hydroxyeicosatetraenoic acid (12(S)-HETE) significantly increased the expression of angiotensin II (Ang II) and Ang II type 1 receptor (AT1R), but decreased the expression of AT1R-associated protein (ATRAP) in rat glomeruli, compared to the control. An in vitro study revealed that both 12(S)-HETE and insulin upregulated AT1R expression in rat mesangial cells. In the presence of p38 mitogen-activated protein kinase (MAPK) inhibitor, SB202190, the 12(S)-HETE-induced ATRAP reduction was significantly abolished. Interestingly, 12-LO inhibition did not influence AT1R expression in type-1 diabetic rats, but significantly abolished the increased AT1R and Ang II expression in glomeruli of type-2 diabetic rats. Furthermore, the inhibition of 12-LO significantly corrected impaired insulin sensitivity and fast serum insulin level, as well as the p-AMP-activated protein kinase (AMPK) reduction in skeletal muscle of type-2 diabetic rats; (4) CONCLUSION: The inhibition of 12-LO potentially ameliorated MAU by preventing IR through the downregulation of glomerular AT1R expression in T2DN.
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MESH Headings
- 12-Hydroxy-5,8,10,14-eicosatetraenoic Acid/pharmacology
- Albuminuria/etiology
- Albuminuria/metabolism
- Animals
- Arachidonate 12-Lipoxygenase/metabolism
- Cells, Cultured
- Diabetes Mellitus, Type 1/complications
- Diabetes Mellitus, Type 1/metabolism
- Diabetes Mellitus, Type 2/complications
- Diabetes Mellitus, Type 2/metabolism
- Diabetic Nephropathies/metabolism
- Down-Regulation
- Insulin Resistance
- Kidney Glomerulus/drug effects
- Kidney Glomerulus/metabolism
- Lipoxygenase Inhibitors/pharmacology
- Male
- Muscle, Skeletal/drug effects
- Muscle, Skeletal/metabolism
- Protein Kinase Inhibitors/pharmacology
- Rats
- Rats, Sprague-Dawley
- Receptor, Angiotensin, Type 1/genetics
- Receptor, Angiotensin, Type 1/metabolism
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Affiliation(s)
- Hong-Zhao Xu
- Department of Nephrology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Yan-Li Cheng
- Department of Nephrology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Wan-Ning Wang
- Department of Nephrology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Hao Wu
- Department of Nephrology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Yuan-Yuan Zhang
- Department of Nephrology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Chong-Sen Zang
- Department of Nephrology, the First Hospital of Jilin University, Changchun 130021, China.
| | - Zhong-Gao Xu
- Department of Nephrology, the First Hospital of Jilin University, Changchun 130021, China.
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10
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Horn T, Adel S, Schumann R, Sur S, Kakularam KR, Polamarasetty A, Redanna P, Kuhn H, Heydeck D. Evolutionary aspects of lipoxygenases and genetic diversity of human leukotriene signaling. Prog Lipid Res 2014; 57:13-39. [PMID: 25435097 PMCID: PMC7112624 DOI: 10.1016/j.plipres.2014.11.001] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 11/17/2014] [Accepted: 11/19/2014] [Indexed: 12/14/2022]
Abstract
Leukotrienes are pro-inflammatory lipid mediators, which are biosynthesized via the lipoxygenase pathway of the arachidonic acid cascade. Lipoxygenases form a family of lipid peroxidizing enzymes and human lipoxygenase isoforms have been implicated in the pathogenesis of inflammatory, hyperproliferative (cancer) and neurodegenerative diseases. Lipoxygenases are not restricted to humans but also occur in a large number of pro- and eucaryotic organisms. Lipoxygenase-like sequences have been identified in the three domains of life (bacteria, archaea, eucarya) but because of lacking functional data the occurrence of catalytically active lipoxygenases in archaea still remains an open question. Although the physiological and/or pathophysiological functions of various lipoxygenase isoforms have been studied throughout the last three decades there is no unifying concept for the biological importance of these enzymes. In this review we are summarizing the current knowledge on the distribution of lipoxygenases in living single and multicellular organisms with particular emphasis to higher vertebrates and will also focus on the genetic diversity of enzymes and receptors involved in human leukotriene signaling.
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Affiliation(s)
- Thomas Horn
- Institute of Biochemistry, Charité - University Medicine Berlin, Charitéplatz 1, CCO-Building, Virchowweg 6, D-10117 Berlin, Germany; Department of Chemistry and Biochemistry, University of California - Santa Cruz, 1156 High Street, 95064 Santa Cruz, USA
| | - Susan Adel
- Institute of Biochemistry, Charité - University Medicine Berlin, Charitéplatz 1, CCO-Building, Virchowweg 6, D-10117 Berlin, Germany
| | - Ralf Schumann
- Institute of Microbiology, Charité - University Medicine Berlin, Charitéplatz 1, D-10117 Berlin, Germany
| | - Saubashya Sur
- Institute of Microbiology, Charité - University Medicine Berlin, Charitéplatz 1, D-10117 Berlin, Germany
| | - Kumar Reddy Kakularam
- Department of Animal Sciences, School of Life Science, University of Hyderabad, Gachibowli, Hyderabad 500046, Telangana, India
| | - Aparoy Polamarasetty
- School of Life Sciences, University of Himachal Pradesh, Dharamshala, Himachal Pradesh 176215, India
| | - Pallu Redanna
- Department of Animal Sciences, School of Life Science, University of Hyderabad, Gachibowli, Hyderabad 500046, Telangana, India; National Institute of Animal Biotechnology, Miyapur, Hyderabad 500049, Telangana, India
| | - Hartmut Kuhn
- Institute of Biochemistry, Charité - University Medicine Berlin, Charitéplatz 1, CCO-Building, Virchowweg 6, D-10117 Berlin, Germany.
| | - Dagmar Heydeck
- Institute of Biochemistry, Charité - University Medicine Berlin, Charitéplatz 1, CCO-Building, Virchowweg 6, D-10117 Berlin, Germany
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Kim DS, Burt AA, Crosslin DR, Robertson PD, Ranchalis JE, Boyko EJ, Nickerson DA, Furlong CE, Jarvik GP. Novel common and rare genetic determinants of paraoxonase activity: FTO, SERPINA12, and ITGAL. J Lipid Res 2012; 54:552-60. [PMID: 23160181 DOI: 10.1194/jlr.p033266] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
HDL-associated paraoxonase 1 (PON1) activity is associated with cardiovascular and other human diseases. As the role of genetic variants outside of the PON gene cluster on PON1 activity is unknown, we sought to identify common and rare variants in such loci. We typed 33,057 variants on the CVD chip in 1,362 subjects to test for their effects on adjusted-PON1 activity. Three novel genes (FTO, ITGAL, and SERPINA12) and the PON gene cluster had SNPs associated with PON1 arylesterase (AREase) activity. These loci were carried forward for rare-variant analysis using Exome chip genotypes in an overlapping subset of 1,051 subjects using sequence kernel association testing. PON1 (P = 2.24 × 10(-4)), PON3 (P = 0.022), FTO (P = 0.019), and SERPINA12 (P = 0.039) had both common and rare variants associated with PON1 AREase. ITGAL variants were associated with PON1 activity when using weighted sequence kernel association testing (SKAT) analysis (P = 2.63 × 10(-3)). When adjusting for the initial common variants, SERPINA12 became marginally significant (P = 0.09), whereas all other findings remained significant (P < 0.05), suggesting independent rare-variant effects. We present novel findings that common and rare variants in FTO, SERPINA12, and ITGAL predict PON1 activity. These results further link PON1 to diabetes and inflammation and may inform the role of HDL in human disease.
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Affiliation(s)
- Daniel S Kim
- Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA
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Caramori ML, Kim Y, Moore JH, Rich SS, Mychaleckyj JC, Kikyo N, Mauer M. Gene expression differences in skin fibroblasts in identical twins discordant for type 1 diabetes. Diabetes 2012; 61:739-44. [PMID: 22315306 PMCID: PMC3282806 DOI: 10.2337/db11-0617] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Clinical studies suggest metabolic memory to hyperglycemia. We tested whether diabetes leads to persistent systematic in vitro gene expression alterations in patients with type 1 diabetes (T1D) compared with their monozygotic, nondiabetic twins. Microarray gene expression was determined in skin fibroblasts (SFs) of five twin pairs cultured in high glucose (HG) for ∼6 weeks. The Exploratory Visual Analysis System tested group differences in gene expression levels within KEGG (Kyoto Encyclopedia of Genes and Genomes) pathways. An overabundance of differentially expressed genes was found in eight pathways: arachidonic acid metabolism (P = 0.003849), transforming growth factor-β signaling (P = 0.009167), glutathione metabolism (P = 0.01281), glycosylphosphatidylinositol anchor (P = 0.01949), adherens junction (P = 0.03134), dorsal-ventral axis formation (P = 0.03695), proteasome (P = 0.04327), and complement and coagulation cascade (P = 0.04666). Several genes involved in epigenetic mechanisms were also differentially expressed. All differentially expressed pathways and all the epigenetically relevant differentially expressed genes have previously been related to HG in vitro or to diabetes and its complications in animal and human studies. However, this is the first in vitro study demonstrating diabetes-relevant gene expression differences between T1D-discordant identical twins. These SF gene expression differences, persistent despite the HG in vitro conditions, likely reflect "metabolic memory", and discordant identical twins thus represent an excellent model for studying diabetic epigenetic processes in humans.
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Affiliation(s)
- M Luiza Caramori
- Department of Medicine, University of Minnesota, Minneapolis, Minnesota, USA.
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Harsløf T, Husted LB, Nyegaard M, Carstens M, Stenkjær L, Brixen K, Eiken P, Jensen JEB, Børglum AD, Mosekilde L, Rejnmark L, Langdahl BL. Polymorphisms in the ALOX12 gene and osteoporosis. Osteoporos Int 2011; 22:2249-59. [PMID: 21104233 DOI: 10.1007/s00198-010-1472-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/26/2010] [Accepted: 10/22/2010] [Indexed: 12/18/2022]
Abstract
UNLABELLED ALOX12 produces ligands for PPARγ thereby turning mesenchymal stem cells into adipocytes instead of osteoblasts. We investigated the effect of polymorphisms in the ALOX12 gene on BMD and fracture risk in two Danish cohorts and found four polymorphisms and a haplotype thereof to be associated with BMD and fracture risk. INTRODUCTION Stimulation of the PPARγ with ligands produced by the ALOX enzymes drives mesenchymal stem cells in an adipocyte direction at the expense of osteoblasts leading to decreased osteoblast number and BMD. Previously, polymorphisms in the ALOX12 gene have been associated with osteoporosis. METHODS We examined the effect of ALOX12 polymorphisms on BMD and the risk of fractures in two Danish cohorts: AROS, a case-control population comprising 809 individuals and DOPS, a population comprising 1,716 perimenopausal women allocated to hormone therapy or not at baseline and followed for up to 10 years. On the basis of linkage disequilibrium (LD) between SNPs throughout the gene and previous genetic association studies we chose ten polymorphisms for investigation. Genotyping was carried out using the Sequenom MassARRAY genotyping system and TaqMan assays. RESULTS In AROS, individuals heterozygous for the polymorphisms rs3840880, rs9897850, rs2292350 and rs1126667 had a 3.0-4.7% decreased lumbar spine BMD (p = 0.02-0.06) and an increased risk of vertebral fractures (p < 0.05) compared with individuals homozygous for either allele. In DOPS, none of the individual SNPs were associated with BMD or incident fractures. In both cohorts, the above-mentioned SNPs comprised an LD-block (pairwise D´ = 1.0, r (2) = 0.45-0.97). A haplotype comprising all the common alleles (frequency 9%) was associated with decreased bone loss at the hip (p < 0.05) and decreased incidence of osteoporotic fractures (p < 0.05) in DOPS and increased femoral neck BMD in AROS (p < 0.05). CONCLUSION Our study suggests that genetic variants in ALOX12 may influence BMD and fracture risk.
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Affiliation(s)
- T Harsløf
- Department of Endocrinology and Internal Medicine, THG, Aarhus University Hospital, 8000, Aarhus C, Denmark.
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Luo P, Wang MH. Eicosanoids, β-cell function, and diabetes. Prostaglandins Other Lipid Mediat 2011; 95:1-10. [PMID: 21757024 DOI: 10.1016/j.prostaglandins.2011.06.001] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2011] [Accepted: 06/01/2011] [Indexed: 10/18/2022]
Abstract
Arachidonic acid (AA) is metabolized by cyclooxygenase (COX), lipoxygenase (LOX), and cytochrome P450 (CYP) enzymes into eicosanoids, which are involved in diverse diseases, including type 1 and type 2 diabetes. During the last 30 years, evidence has been accumulated that suggests important functions for eicosanoids in the control of pancreatic β-cell function and destruction. AA metabolites of the COX pathway, especially prostaglandin E(2) (PGE(2)), appear to be significant factors to β-cell dysfunction and destruction, participating in the pathogenesis of diabetes and its complications. Several elegant studies have contributed to the sorting out of the importance of 12-LOX eicosanoids in cytokine-mediated inflammation in pancreatic β cells. The role of CYP eicosanoids in diabetes is yet to be explored. A recent publication has demonstrated that stabilizing the levels of epoxyeicosatrienoic acids (EETs), CYP eicosanoids, by inhibiting or deleting soluble epoxide hydrolase (sEH) improves β-cell function and reduces β-cell apoptosis in diabetes. In this review we summarize recent findings implicating these eicosanoid pathways in diabetes and its complications. We also discuss the development of animal models with targeted gene deletion and specific enzymatic inhibitors in each pathway to identify potential targets for the treatment of diabetes and its complications.
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Affiliation(s)
- Pengcheng Luo
- Department of Nephrology, Renmin Hospital of Wuhan University, China
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Association of a functional polymorphism (Gln261Arg) in 12-lipoxygenase with breast cancer. Exp Ther Med 2011; 2:317-323. [PMID: 22977504 DOI: 10.3892/etm.2011.209] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2010] [Accepted: 01/03/2011] [Indexed: 01/03/2023] Open
Abstract
The overexpression of arachidonyl lipoxygenase-12 (ALOX12) in breast cancer has been reported. Hence, we examined whether a non-synonymous polymorphism of ALOX12 (mRNA, A835G; Gln261Arg) is associated with breast cancer in females. The polymorphism was detected in genomic DNA by PCR-RFLP. The association between the A835G polymorphism and breast cancer risk was measured by odds ratio (OR) with 95% confidence intervals (CIs) using Fisher's exact test, and differences were considered significant at p<0.05. The frequencies of AA (wild-type), GG (homozygous variant) and AG (heterozygous variant) were 59.5, 0.9 and 39.6% in the controls, and 39.3, 2.5 and 58.2% in the breast cancer cases, respectively. The frequency of the AG genotype was higher in the patients compared to the controls (p<0.0014). The frequency of the GG variant was 2.5 and 0.9% in the cancer subjects and controls, respectively. The relative risk of breast cancer was 2 times greater (OR=2.227) at 95% CI when compared to the relative risk of the heterozygous variant. For the GG genotype, the risk was 4 times greater (OR=4.125) at 95% CI than that of the controls, suggesting a positive association of the AG genotype with the occurrence of breast cancer. The frequencies of the polymorphism were different in different populations. The Arg/Gln and Arg/Arg variants were associated with an increased risk of breast cancer, and the frequencies of the variants differed considerably among various populations. The identification of a gene with links to breast cancer may impact screening, diagnosis and drug development.
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Bowden DW, Cox AJ, Freedman BI, Hugenschimdt CE, Wagenknecht LE, Herrington D, Agarwal S, Register TC, Maldjian JA, Ng MCY, Hsu FC, Langefeld CD, Williamson JD, Carr JJ. Review of the Diabetes Heart Study (DHS) family of studies: a comprehensively examined sample for genetic and epidemiological studies of type 2 diabetes and its complications. Rev Diabet Stud 2010; 7:188-201. [PMID: 21409311 DOI: 10.1900/rds.2010.7.188] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The Diabetes Heart Study (DHS) is a genetic and epidemiological study of 1,443 European American and African American participants from 564 families with multiple cases of type 2 diabetes. Initially, participants were comprehensively examined for measures of subclinical cardiovascular disease (CVD) including computed tomography measurement of vascular calcified plaque, ultrasound imaging of carotid artery wall thickness, and electrocardiographic intervals. Subsequent studies have investigated the relationship between bone mineral density and vascular calcification, measures of adiposity, and biomarkers. Ongoing studies are carrying out an extensive evaluation of cerebrovascular disease using magnetic resonance imaging and cognitive assessment. A second, parallel study, the African American DHS, has expanded the sample of African Americans to investigate marked racial differences in subclinical CVD between European Americans and African Americans. Studies in development will evaluate the impact of social stress during the lifecourse on CVD risk, and the prevalence of gastroparesis in this diabetes enriched sample. In addition, the ongoing high mortality rate in DHS participants provides novel insights into the increased risks for type 2 diabetes affected individuals. A comprehensive genetic analysis of the sample is underway using the genome-wide association study (GWAS) approach. Data from this GWAS survey will complement prior family-based linkage data in the analysis of genetic contributors to the wide range of traits in the sample. To our knowledge the DHS family of studies has created the most comprehensively examined sample of individuals with type 2 diabetes yet available, and represents a unique resource for the study people with type 2 diabetes. The aim of this review is to provide a collective overview of the major results from the DHS family of studies, and relate them to the larger body of biomedical investigations of diabetes and its complications.
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Affiliation(s)
- Donald W Bowden
- Center for Diabetes Research, Wake Forest University School of Medicine, Medical Center Blvd., Winston-Salem, North Carolina, USA.
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