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Shi K, Hou J, Zhang Q, Bi Y, Zeng X, Wang X. Neutrophil-to-high-density-lipoprotein-cholesterol ratio and mortality among patients with hepatocellular carcinoma. Front Nutr 2023; 10:1127913. [PMID: 37215223 PMCID: PMC10198653 DOI: 10.3389/fnut.2023.1127913] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 03/29/2023] [Indexed: 05/24/2023] Open
Abstract
Background Inflammatory responses and lipid metabolism disorders contribute to the development and prognosis of hepatocellular carcinoma (HCC). This study aimed to investigate the prognostic value of lipid-related inflammatory parameters in patients with HCC. Methods From January 2010 to June 2017, we enrolled 1,639 patients with HCC at Beijing Ditan Hospital. Multivariate Cox regression analysis and area under the receiver operating characteristic (AUC) analysis were used to evaluate and compare the predictability and reliability of high-density lipoprotein cholesterol (HDL-C), neutrophil-to-HDL-C ratio (NHR), monocyte-to-HDL-C ratio (MHR), and lymphocyte-to-HDL-C ratio (LHR) values. A restricted cubic spline was used to explore the association between the NHR and 3-year mortality in patients with HCC. Differences in survival rates were estimated using the Kaplan-Meier method and compared using the log-rank test. The results were validated in an internal cohort between July 2017 and October 2019 (n = 373). Results After adjusting for confounding variables, NHR was independently associated with 3-year mortality, both as a continuous and categorical variable (both p < 0.05). The correlation between the mortality and the MHR and LHR was not statistically significant. The NHR showed a suitable prognostic value (AUC at 3 years: 0.740), similar to that of the Model for End-stage Liver Disease (MELD) (AUC at 3 years: 0.761). In the validation cohort, the AUC of the NHR was 0.734 at 3 years. The optimal cut-off values of NHR and MELD were 3.5 and 9, respectively. The 3-year survival rates in the low- (NHR < 3.5 and MELD <9) and high-risk (NHR ≥ 3.5 and MELD ≥9) groups were 81.8 and 19.4%, respectively, in the training cohort, and 84.6 and 27.5%, respectively, in the validation cohort. Conclusion Baseline NHR is a promising prognostic parameter for mortality in patients with HCC and patients with NHR ≥ 3.5 and MELD ≥9 have a high mortality rate.
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Affiliation(s)
- Ke Shi
- Center of Integrative Medicine, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Jie Hou
- Department of Spleen and Stomach Diseases, Hengshui Hospital of Traditional Chinese Medicine, Hebei, China
| | - Qun Zhang
- Center of Integrative Medicine, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Yufei Bi
- Center of Integrative Medicine, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Xuanwei Zeng
- Center of Integrative Medicine, Beijing Ditan Hospital, Capital Medical University, Beijing, China
| | - Xianbo Wang
- Center of Integrative Medicine, Beijing Ditan Hospital, Capital Medical University, Beijing, China
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Kong Y, Chen Z, Zhang J, Wu L. Neutrophil to High-density Lipoprotein ratio (NHR) as a potential predictor of disease severity and survival time in Creutzfeldt-Jakob disease. BMC Neurol 2023; 23:34. [PMID: 36690949 PMCID: PMC9869630 DOI: 10.1186/s12883-023-03076-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Accepted: 01/18/2023] [Indexed: 01/24/2023] Open
Abstract
INTRODUCTION Creutzfeldt-Jakob disease (CJD) is a fatal and irreversible neurodegenerative disease. Identification of inexpensive and easy-to-implement biomarkers of CJD which could predict disease severity and patient survival is important for improving disease management. The aim of this study was to assess the predictive value of peripheral neutrophil to lymphocyte ratio (NLR), high-density lipoprotein (HDL), monocyte to HDL ratio (MHR) and neutrophil to HDL ratio (NHR) for CJD. METHODS Patients with definite or probable CJD admitted to the Neurology Department of Xuanwu Hospital from 2014 to 2021 were enrolled and followed up until April 2022. Clinical information including sex, age, Barth Index, survival time and results of auxiliary examination were collected, and NLR, HDL, NHR and MHR were measured for all enrolled patients. The associations between NLR, HDL, NHR and MHR, and disease severity (evaluated by Barth Index), survival time and auxiliary examinations were evaluated. RESULTS A total of 88 CJD patients were enrolled and all were deceased. NLR (r = -0.341, p = 0.001), NHR (r = -0.346, p = 0.001) and MHR (r = -0.327, p = 0.002) were significantly associated with disease severity. Higher NHR (HR = 2.344, 95% CI = 1.277-4.303 p = 0.006) and lower HDL (HR = 0.567, 95% CI = 0.346-0.930, p = 0.025) were associated with shorter survival time in the CJD patients. CONCLUSIONS Peripheral inflammatory biomarkers, especially NHR, were associated with disease severity and survival duration. These findings provide new insights into the mechanisms and treatment strategies of CJD.
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Affiliation(s)
- Yu Kong
- grid.413259.80000 0004 0632 3337Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Zhongyun Chen
- grid.413259.80000 0004 0632 3337Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Jing Zhang
- grid.413259.80000 0004 0632 3337Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
| | - Liyong Wu
- grid.413259.80000 0004 0632 3337Department of Neurology, Xuanwu Hospital, Capital Medical University, Beijing, China
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Zhang X, Wei M, Bo Y, Song J, Yu Y, Zhou X, Tang B. Predictive value of neutrophil-to-apolipoprotein A1 ratio in all-cause and cardiovascular death in elderly non-valvular atrial fibrillation patients. Heliyon 2023; 9:e12918. [PMID: 36820183 PMCID: PMC9938414 DOI: 10.1016/j.heliyon.2023.e12918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 12/13/2022] [Accepted: 01/09/2023] [Indexed: 01/13/2023] Open
Abstract
Neutrophil-to-apolipoprotein AI ratio's (NAR's) predictive value for the elderly non-valvular atrial fibrillation (NVAF) patients' death has not been fully recognized. We consecutively enrolled 1224 elderly patients with NVAF (≥75 years). With an average follow-up of 733.35 ± 271.39 days, 222 all-cause deaths were identified. Among these, 101 were caused by cardiovascular diseases. Cox regression showed that after correcting for potential confounders, patients in the Q4 group had an increased all-cause (hazard ratio [HR] = 1.90, 95% confidence interval [CI]: 1.20-2.99) and cardiovascular death (HR = 2.59, 95% CI: 1.30-5.15) risk compared to those in the lowest NAR quartile. Kaplan-Meier analysis indicated that all-cause and cardiovascular death were higher in the high NAR than those in the lowest NAR category (log rank, all, P < 0.001). A nonlinear association was observed between death and NAR. NAR may be a promising predictive biomarker for identifying elderly NVAF patients with poor clinical prognoses.
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Affiliation(s)
- Xiaoxue Zhang
- Department of Cardiac Pacing and Electrophysiology, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China,Xinjiang Key Laboratory of Cardiac Electrophysiology and Remodeling, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China
| | - Meng Wei
- Department of Outpatient, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China
| | - Yakun Bo
- Department of Cardiac Pacing and Electrophysiology, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China,Xinjiang Key Laboratory of Cardiac Electrophysiology and Remodeling, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China
| | - Jie Song
- Department of Cardiac Pacing and Electrophysiology, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China,Xinjiang Key Laboratory of Cardiac Electrophysiology and Remodeling, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China
| | - Yaping Yu
- Department of Cardiac Pacing and Electrophysiology, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China,Xinjiang Key Laboratory of Cardiac Electrophysiology and Remodeling, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China
| | - Xianhui Zhou
- Department of Cardiac Pacing and Electrophysiology, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China,Xinjiang Key Laboratory of Cardiac Electrophysiology and Remodeling, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China,Corresponding author.Department of Cardiac Pacing and Electrophysiology, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China.
| | - Baopeng Tang
- Department of Cardiac Pacing and Electrophysiology, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China,Xinjiang Key Laboratory of Cardiac Electrophysiology and Remodeling, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China,Corresponding author.Department of Cardiac Pacing and Electrophysiology, The First Affiliated Hospital of Xinjiang Medical University, Urumqi, 830054 P.R., China.
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Zhang Q, Jiang Z, Xu Y. HDL and Oxidation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1377:63-77. [PMID: 35575921 DOI: 10.1007/978-981-19-1592-5_5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In this chapter, we will focus on HDLs' activity of inhibiting LDL oxidation and neutralizing some other oxidants. ApoA-I was known as the main antioxidant component in HDLs. The regulation of antioxidant capacity of HDL is mainly exhibited in regulation of apoA-I and alterations at the level of the HDL lipidome and the modifications of the proteome, especially MPO and PON1. HDL oxidation will influence the processes of inflammation and cholesterol transport, which are important processes in atherosclerosis, metabolic diseases, and many other diseases. In a word, HDL oxidation might be an effective antioxidant target in treatment of many diseases.
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Affiliation(s)
- Qi Zhang
- The Institute of Cardiovascular Sciences and Institute of Systems Biomedicine, School of Basic Medical Sciences, Key Laboratory of Molecular Cardiovascular Science of Ministry of Education, NHC Key Laboratory of Cardiovascular Molecular Biology and Regulatory Peptides, Beijing Key Laboratory of Cardiovascular Receptors Research, Health Science Center, Peking University, Beijing, China
| | - Zongzhe Jiang
- Department of Endocrinology and Metabolism, Metabolic Vascular Disease Key Laboratory of Sichuan Province, Sichuan Clinical Research Center for Nephropathy, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China
| | - Yong Xu
- Department of Endocrinology and Metabolism, Metabolic Vascular Disease Key Laboratory of Sichuan Province, Sichuan Clinical Research Center for Nephropathy, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China.
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Understanding Myeloperoxidase-Induced Damage to HDL Structure and Function in the Vessel Wall: Implications for HDL-Based Therapies. Antioxidants (Basel) 2022; 11:antiox11030556. [PMID: 35326206 PMCID: PMC8944857 DOI: 10.3390/antiox11030556] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 03/10/2022] [Accepted: 03/11/2022] [Indexed: 12/23/2022] Open
Abstract
Atherosclerosis is a disease of increased oxidative stress characterized by protein and lipid modifications in the vessel wall. One important oxidative pathway involves reactive intermediates generated by myeloperoxidase (MPO), an enzyme present mainly in neutrophils and monocytes. Tandem MS analysis identified MPO as a component of lesion derived high-density lipoprotein (HDL), showing that the two interact in the arterial wall. MPO modifies apolipoprotein A1 (apoA-I), paraoxonase 1 and certain HDL-associated phospholipids in human atheroma. HDL isolated from atherosclerotic plaques depicts extensive MPO mediated posttranslational modifications, including oxidation of tryptophan, tyrosine and methionine residues, and carbamylation of lysine residues. In addition, HDL associated plasmalogens are targeted by MPO, generating 2-chlorohexadecanal, a pro-inflammatory and endothelial barrier disrupting lipid that suppresses endothelial nitric oxide formation. Lesion derived HDL is predominantly lipid-depleted and cross-linked and exhibits a nearly 90% reduction in lecithin-cholesterol acyltransferase activity and cholesterol efflux capacity. Here we provide a current update of the pathophysiological consequences of MPO-induced changes in the structure and function of HDL and discuss possible therapeutic implications and options. Preclinical studies with a fully functional apoA-I variant with pronounced resistance to oxidative inactivation by MPO-generated oxidants are currently ongoing. Understanding the relationships between pathophysiological processes that affect the molecular composition and function of HDL and associated diseases is central to the future use of HDL in diagnostics, therapy, and ultimately disease management.
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Wang Y, Zhang J, Li H, Kong W, Zheng J, Li Y, Wei Q, Li Q, Yang L, Xu Y, Li L, Wang H, Sun H, Xia W, Liu G, Zhong X, Qiu K, Wang H, Liu H, Song X, Xiong S, Liu Y, Cui Z, Chen L, Zeng T. Prognostic Value of Leucocyte to High-Density Lipoprotein-Cholesterol Ratios in COVID-19 Patients and the Diabetes Subgroup. Front Endocrinol (Lausanne) 2021; 12:727419. [PMID: 34589058 PMCID: PMC8473871 DOI: 10.3389/fendo.2021.727419] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 08/30/2021] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Blood parameters, such as neutrophil-to-lymphocyte ratio, have been identified as reliable inflammatory markers with diagnostic and predictive value for the coronavirus disease 2019 (COVID-19). However, novel hematological parameters derived from high-density lipoprotein-cholesterol (HDL-C) have rarely been studied as indicators for the risk of poor outcomes in patients with severe acute respiratory syndrome-related coronavirus 2 (SARS-CoV-2) infection. Here, we aimed to assess the prognostic value of these novel biomarkers in COVID-19 patients and the diabetes subgroup. METHODS We conducted a multicenter retrospective cohort study involving all hospitalized patients with COVID-19 from January to March 2020 in five hospitals in Wuhan, China. Demographics, clinical and laboratory findings, and outcomes were recorded. Neutrophil to HDL-C ratio (NHR), monocyte to HDL-C ratio (MHR), lymphocyte to HDL-C ratio (LHR), and platelet to HDL-C ratio (PHR) were investigated and compared in both the overall population and the subgroup with diabetes. The associations between blood parameters at admission with primary composite end-point events (including mechanical ventilation, admission to the intensive care unit, or death) were analyzed using Cox proportional hazards regression models. Receiver operating characteristic curves were used to compare the utility of different blood parameters. RESULTS Of 440 patients with COVID-19, 67 (15.2%) were critically ill. On admission, HDL-C concentration was decreased while NHR was high in patients with critical compared with non-critical COVID-19, and were independently associated with poor outcome as continuous variables in the overall population (HR: 0.213, 95% CI 0.090-0.507; HR: 1.066, 95% CI 1.030-1.103, respectively) after adjusting for confounding factors. Additionally, when HDL-C and NHR were examined as categorical variables, the HRs and 95% CIs for tertile 3 vs. tertile 1 were 0.280 (0.128-0.612) and 4.458 (1.817-10.938), respectively. Similar results were observed in the diabetes subgroup. ROC curves showed that the NHR had good performance in predicting worse outcomes. The cutoff point of the NHR was 5.50. However, the data in our present study could not confirm the possible predictive effect of LHR, MHR, and PHR on COVID-19 severity. CONCLUSION Lower HDL-C concentrations and higher NHR at admission were observed in patients with critical COVID-19 than in those with noncritical COVID-19, and were significantly associated with a poor prognosis in COVID-19 patients as well as in the diabetes subgroup.
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Affiliation(s)
- Yuxiu Wang
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Jiaoyue Zhang
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Huiqing Li
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Wen Kong
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Juan Zheng
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Yan Li
- Department of Endocrinology, Wuhan Wuchang Hospital, Wuchang Hospital Affiliated to Wuhan University of Science and Technology, Wuhan, China
| | - Qi Wei
- Department of Endocrinology, Red Cross Hospital of Wuhan City, Wuhan, China
| | - Qin Li
- Department of Endocrinology, General Hospital of the Yangtze River Shipping, Wuhan, China
| | - Li Yang
- Department of Endocrinology, Hankou Hospital of Wuhan City, Wuhan, China
| | - Ying Xu
- Department of Endocrinology, The Fifth Hospital of Wuhan, Wuhan, China
| | - Li Li
- Department of Endocrinology, Wuhan Wuchang Hospital, Wuchang Hospital Affiliated to Wuhan University of Science and Technology, Wuhan, China
| | - Hanyu Wang
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Hui Sun
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Wenfang Xia
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Geng Liu
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Xueyu Zhong
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Kangli Qiu
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Han Wang
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Hua Liu
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Xiaoli Song
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Si Xiong
- Department of Endocrinology, The Fifth Hospital of Wuhan, Wuhan, China
| | - Yumei Liu
- Department of Endocrinology, Hankou Hospital of Wuhan City, Wuhan, China
| | - Zhenhai Cui
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
| | - Lulu Chen
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
- *Correspondence: Tianshu Zeng, ; Lulu Chen,
| | - Tianshu Zeng
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
- Hubei Provincial Clinical Research Center for Diabetes and Metabolic Disorders, Wuhan, China
- *Correspondence: Tianshu Zeng, ; Lulu Chen,
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Neutrophil Counts to High-Density Lipoprotein Cholesterol Ratio: a Potential Predictor of Prognosis in Acute Ischemic Stroke Patients After Intravenous Thrombolysis. Neurotox Res 2020; 38:1001-1009. [PMID: 32894456 DOI: 10.1007/s12640-020-00274-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 08/15/2020] [Accepted: 08/18/2020] [Indexed: 12/19/2022]
Abstract
Neutrophil counts to high-density lipoprotein cholesterol ratio (NHR) is a relatively new and readily available indicator, and our study aimed to demonstrate its relationship with short-term prognosis after intravenous thrombolysis in acute ischemic stroke (AIS) patients and to make a simple comparison with other prognostic indicators. We compared demographic and laboratory characteristics of AIS patients and healthy controls and grouped AIS patients according to NHR tertiles to contrast 3-month outcomes. Univariate and multivariate regression analyses were carried to further analyze the relationship between NHR and prognosis. Moreover, we compared the accuracy of several factors using receiver-operating characteristic curve. NHR levels of AIS patients were higher than those of healthy controls (p < 0.001). The NHR levels were significantly higher in AIS patients with poor prognosis than those with good prognosis (p = 0.001) and were higher in patients with severe stroke than those with mild stroke (p = 0.011). Multivariate logistic regression analysis indicated that elevated NHR was an independent predictor of poor outcomes (odds ratio = 4.570; 95% CI, 1.841-11.340; p = 0.001). High NHR levels were associated with poor 3-month outcomes after intravenous thrombolysis in AIS patients.
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Cuesta Torres LF, Zhu W, Öhrling G, Larsson R, Patel M, Wiese CB, Rye KA, Vickers KC, Tabet F. High-density lipoproteins induce miR-223-3p biogenesis and export from myeloid cells: Role of scavenger receptor BI-mediated lipid transfer. Atherosclerosis 2019; 286:20-29. [PMID: 31096070 DOI: 10.1016/j.atherosclerosis.2019.04.227] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 04/17/2019] [Accepted: 04/30/2019] [Indexed: 12/22/2022]
Abstract
BACKGROUND AND AIMS We recently showed that miR-223-3p on high-density lipoproteins (HDL) is exported to endothelial cells, where it inhibits inflammation. However, the origin of miR-223-3p on HDL is unknown. We hypothesize that HDL-associated miR-223-3p originates in myeloid cells and is exported to HDL in a scavenger receptor BI (SR-BI)-dependent manner. METHODS Polymorphonuclear neutrophils (PMNs) and human monocyte derived macrophages (HMDMs) were incubated with native HDL (nHDL) or discoidal reconstituted HDL (rHDL). Total RNA was isolated before and after incubation. Mature and primary miR-223-3p (pri-mir-223-3p) levels were quantified by real-time PCR. RESULTS Incubation with nHDL and rHDL increased miR-223-3p export from PMNs and HMDMs. In PMNs, nHDL but not rHDL, increased mature and pri-mir-223-3p. Incubation with HDL also increased Dicer mRNA, a critical regulator of miRNA biogenesis. Incubation of HMDMs with nHDL did not increase cellular levels of mature miR-223-3p, but significantly increased pri-mir-223 levels. Incubation with rHDL had no effect on either mature or pri-mir-223-3p levels. Activated PMNs increased miR-223-3p export to HDL and the production of reactive oxygen species and activated protein kinase C. Blocking HDL binding to SR-BI increased miR-223-3p export to HDL in both PMNs and HMDMs, but did not affect mature and primary miR-223-3p levels. Chemical inhibition of cholesterol flux by Block Lipid Transport (BLT)-1 inhibited HDL-induced pri-mir-223 expression in PMNs. CONCLUSIONS HDL-associated miR-223-3p originates in PMNs and macrophages. HDL stimulates miR-223-3p biogenesis in PMNs in a process that is regulated by SR-BI-mediated lipid flux.
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Affiliation(s)
| | - Wanying Zhu
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Gustav Öhrling
- School of Medical Sciences, University of New South Wales Sydney, NSW, Australia
| | - Rasmus Larsson
- School of Medical Sciences, University of New South Wales Sydney, NSW, Australia
| | - Mili Patel
- School of Medical Sciences, University of New South Wales Sydney, NSW, Australia
| | - Carrie B Wiese
- Department of Molecular Physiology & Biophysics, Vanderbilt University, Nashville, TN, USA
| | - Kerry-Anne Rye
- School of Medical Sciences, University of New South Wales Sydney, NSW, Australia
| | - Kasey C Vickers
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA; Department of Molecular Physiology & Biophysics, Vanderbilt University, Nashville, TN, USA
| | - Fatiha Tabet
- School of Medical Sciences, University of New South Wales Sydney, NSW, Australia.
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The Effect of Taxifolin on Cisplatin-Induced Pulmonary Damage in Rats: A Biochemical and Histopathological Evaluation. Mediators Inflamm 2019; 2019:3740867. [PMID: 30992689 PMCID: PMC6434269 DOI: 10.1155/2019/3740867] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2018] [Revised: 12/21/2018] [Accepted: 01/01/2019] [Indexed: 12/27/2022] Open
Abstract
The effect of taxifolin on cisplatin-induced oxidative pulmonary damage was investigated biochemically and histopathologically in male albino Wistar rats. There were four groups, with six animals in each group: 50 mg/kg of taxifolin plus 2.5 mg/kg of cisplatin (TC) group, 2.5 mg/kg of cisplatin only (CIS) group, 50 mg/kg of taxifolin only (TG) group, and a healthy control group (HG). In terms of the experimental procedure, the animals in the TC and TG groups were first treated via oral gavage. The CIS and HG groups received distilled water as solvent, respectively. One hour later, the TC and CIS groups received cisplatin at a dose of 2.5 mg/kg (injected intraperitoneally). Taxifolin, cisplatin, and the distilled water were administered at the indicated dose and volume, using the same method daily for 14 d. At the end of this period, the animals were killed with a high dosage of thiopental anaesthesia (50 mg/kg). Blood and lung tissue samples were taken for biochemical (malondialdehyde (MDA), myeloperoxidase (MPO), total glutathione (tGSH), and 8-hydroxy-2 deoxyguanosine (8-OHdG)) analyses and histopathological examinations. The biochemical and histopathological results in the TC and HG groups were then compared with those in the CIS group. Cisplatin increased the levels of MDA, myeloperoxidase, and 8-OHdG, a marker of oxidative DNA damage, and reduced the amount of tGSH in the lung tissue. Moreover, severe alveolar damage, including oedema and extensive alveolar septal fibrosis, in addition to infiltration of polymorphic nuclear leucocytes and haemorrhagic foci, was observed in the CIS group. These histopathological findings demonstrate that taxifolin provides protection against pulmonary oxidative stress by preventing increases in oxidant parameters and decreases in antioxidants.
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Urinary CE-MS peptide marker pattern for detection of solid tumors. Sci Rep 2018; 8:5227. [PMID: 29588543 PMCID: PMC5869723 DOI: 10.1038/s41598-018-23585-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 03/09/2018] [Indexed: 01/06/2023] Open
Abstract
Urinary profiling datasets, previously acquired by capillary electrophoresis coupled to mass-spectrometry were investigated to identify a general urinary marker pattern for detection of solid tumors by targeting common systemic events associated with tumor-related inflammation. A total of 2,055 urinary profiles were analyzed, derived from a) a cancer group of patients (n = 969) with bladder, prostate, and pancreatic cancers, renal cell carcinoma, and cholangiocarcinoma and b) a control group of patients with benign diseases (n = 556), inflammatory diseases (n = 199) and healthy individuals (n = 331). Statistical analysis was conducted in a discovery set of 676 cancer cases and 744 controls. 193 peptides differing at statistically significant levels between cases and controls were selected and combined to a multi-dimensional marker pattern using support vector machine algorithms. Independent validation in a set of 635 patients (293 cancer cases and 342 controls) showed an AUC of 0.82. Inclusion of age as independent variable, significantly increased the AUC value to 0.85. Among the identified peptides were mucins, fibrinogen and collagen fragments. Further studies are planned to assess the pattern value to monitor patients for tumor recurrence. In this proof-of-concept study, a general tumor marker pattern was developed to detect cancer based on shared biomarkers, likely indicative of cancer-related features.
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Boncler M, Kehrel B, Szewczyk R, Stec-Martyna E, Bednarek R, Brodde M, Watala C. Oxidation of C-reactive protein by hypochlorous acid leads to the formation of potent platelet activator. Int J Biol Macromol 2017; 107:2701-2714. [PMID: 29111269 DOI: 10.1016/j.ijbiomac.2017.10.159] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Revised: 10/22/2017] [Accepted: 10/25/2017] [Indexed: 01/27/2023]
Abstract
We examined the structural and functional consequences of oxidative modification of C-reactive protein (CRP) by hypochlorous acid (HOCl), which can be generated in vivo via the myeloperoxidase/H2O2/Cl- system. HOCl exposure resulted in the oxidation and chlorination of CRP amino acid residues, leading to protein unfolding, greater surface hydrophobicity and the formation of aggregates. After treatment of isolated platelets with 50μg/ml HOCl-CRP, the modified CRP significantly stimulated platelet activation (over 10-fold increase in the fraction of CD62-positive platelets compared to controls, P<0.008), enhanced deposition of platelets onto immobilized fibrinogen (two-fold rise in platelet adhesion compared to controls, P<0.0001), and induced platelet aggregation by up to 79.5%. The ability of HOCl-CRP to interact with several platelet receptors (TLR-4, GPIIbIIIa) and plasma proteins (C1q, IgG) strongly indicates that HOCl-modification leads to structural changes of CRP resulting in the formation of new ligand binding sites, which is characteristic of the monomeric form of CRP exerting pro-inflammatory effects on a variety of cells. Overall, the oxidation of native CRP by HOCl seems to represent an alternative mechanism of CRP modification, by which CRP reveals its pro-inflammatory and pro-thrombotic properties, and as such, it might be of causal relevance in the pathogenesis of atherosclerosis.
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Affiliation(s)
- Magdalena Boncler
- Department of Haemostasis and Haemostatic Disorders, Medical University of Lodz, Lodz, Poland.
| | - Beate Kehrel
- Department of Anesthesiology, Intensive Care and Pain Medicine, Experimental and Clinical Haemostasis, University Hospital, Muenster, Germany
| | - Rafał Szewczyk
- Department of Industrial Microbiology and Biotechnology, University of Lodz, Lodz, Poland
| | | | - Radosław Bednarek
- Department of Cytobiology and Proteomics, Medical University of Lodz, Lodz, Poland
| | - Martin Brodde
- Department of Anesthesiology, Intensive Care and Pain Medicine, Experimental and Clinical Haemostasis, University Hospital, Muenster, Germany
| | - Cezary Watala
- Department of Haemostasis and Haemostatic Disorders, Medical University of Lodz, Lodz, Poland
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12
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Antioxidative activity of high-density lipoprotein (HDL): Mechanistic insights into potential clinical benefit. BBA CLINICAL 2017; 8:66-77. [PMID: 28936395 PMCID: PMC5597817 DOI: 10.1016/j.bbacli.2017.07.002] [Citation(s) in RCA: 135] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/21/2017] [Accepted: 07/24/2017] [Indexed: 12/29/2022]
Abstract
Uptake of low-density lipoprotein (LDL) particles by macrophages represents a key step in the development of atherosclerotic plaques, leading to the foam cell formation. Chemical modification of LDL is however necessary to induce this process. Proatherogenic LDL modifications include aggregation, enzymatic digestion and oxidation. LDL oxidation by one-electron (free radicals) and two-electron oxidants dramatically increases LDL affinity to macrophage scavenger receptors, leading to rapid LDL uptake and fatty streak formation. Circulating high-density lipoprotein (HDL) particles, primarily small, dense, protein-rich HDL3, provide potent protection of LDL from oxidative damage by free radicals, resulting in the inhibition of the generation of pro-inflammatory oxidized lipids. HDL-mediated inactivation of lipid hydroperoxides involves their initial transfer from LDL to HDL and subsequent reduction to inactive hydroxides by redox-active Met residues of apolipoprotein A-I. Several HDL-associated enzymes are present at elevated concentrations in HDL3 relative to large, light HDL2 and can be involved in the inactivation of short-chain oxidized phospholipids. Therefore, HDL represents a multimolecular complex capable of acquiring and inactivating proatherogenic lipids. Antioxidative function of HDL can be impaired in several metabolic and inflammatory diseases. Structural and compositional anomalies in the HDL proteome and lipidome underlie such functional deficiency. Concomitant normalization of the metabolism, circulating levels, composition and biological activities of HDL particles, primarily those of small, dense HDL3, can constitute future therapeutic target.
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13
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Kellner S, DeMott MS, Cheng CP, Russell BS, Cao B, You D, Dedon PC. Oxidation of phosphorothioate DNA modifications leads to lethal genomic instability. Nat Chem Biol 2017; 13:888-894. [PMID: 28604692 PMCID: PMC5577368 DOI: 10.1038/nchembio.2407] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 03/30/2017] [Indexed: 12/12/2022]
Abstract
Genomic modification with sulfur as phosphorothioate (PT) is widespread among prokaryotes, including human pathogens. Apart from its physiological functions, the redox and nucleophilic properties of PT sulfur suggest effects on bacterial fitness in stressful environments. Here we show that PTs are dynamic and labile DNA modifications that cause genomic instability during oxidative stress. Using coupled isotopic labeling-mass spectrometry, we observed sulfur replacement in PTs at a rate of ~2%/h in unstressed Escherichia coli and Salmonella enterica. While PT levels were unaffected by exposure to hydrogen peroxide (H2O2) or hypochlorous acid (HOCl), PT turnover increased to 3.8–10%/h for HOCl and was unchanged for H2O2, consistent with repair of HOCl-induced sulfur damage. PT-dependent HOCl sensitivity extended to cytotoxicity and DNA strand-breaks, which occurred at orders-of-magnitude lower doses of HOCl than H2O2. The genotoxicity of HOCl in PT-containing bacteria suggests reduced fitness in competition with HOCl-producing organisms and during human infections.
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Affiliation(s)
- Stefanie Kellner
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Michael S DeMott
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Ching Pin Cheng
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Brandon S Russell
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Bo Cao
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Delin You
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, China
| | - Peter C Dedon
- Department of Biological Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.,Singapore-MIT Alliance for Research and Technology, Singapore
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14
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Synthesis of a highly HOCl-selective fluorescent probe and its use for imaging HOCl in cells and organisms. Nat Protoc 2016; 11:1219-28. [DOI: 10.1038/nprot.2016.062] [Citation(s) in RCA: 132] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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15
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Kumbasar S, Salman S, Al RA, Ozturk C, Yarali O, Alp HH, Altuner D, Suleyman B. The effect of metamizole on ischemia/reperfusion injury in the rat ovary: An analysis of biochemistry, molecular gene expression, and histopathology. Indian J Pharmacol 2016; 48:32-6. [PMID: 26997719 PMCID: PMC4778203 DOI: 10.4103/0253-7613.174515] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Objectives: In this study, we investigated the effect of metamizole on ischemia/reperfusion (I/R) injury an analysis of biochemistry, molecular gene expression, and histopathology in the rat ovary of female albino Wistar rats. Materials and Methods: Animals were divided into four groups; control group with induced ischemia-reperfusion (IRC), ischemia-reperfusion +100 mg/kg metamizole sodium (MS) (IRM-100), ischemia-reperfusion +200 mg/kg MS (IRM-200), and healthy group applied sham operation (SG). Results: Myeloperoxidase (MPO) activity and gene expression increased significantly in IRC and IRM-100 group rat ovarian tissue compared with the SG group (P < 0.0001). However, MPO activity and gene expression in IRM-200 group ovarian tissue decreased significantly compared with the IRC and IRM-100 groups (P < 0.0001). Histopathologically, pronounced congestion, dilated vessels, hemorrhage, edema, degenerative cells, and neutrophil migration and adhesion to the endothelium were observed in the IRC and IRM-100 group ovarian tissues. A small number of congested dilated vessels, mild congestion, and edema were observed in the IRM-200 group, but no neutrophil migration and adhesion to the endothelium or degenerative cells. Conclusions: At 200 mg/kg dose metamizole prevented ovarian injury induced with I/R. This data show that metamizole can be used in the ovarian I/R injury treatment.
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Affiliation(s)
- Serkan Kumbasar
- Department of Obstetrics and Gynecology, School of Medicine, Sakarya University, Sakarya, Turkey
| | - Suleyman Salman
- Department of Obstetrics and Gynecology, Gaziosmanpasa Taksim Education and Research Hospital, Istanbul, Turkey
| | - Ragip Atakan Al
- Department of Obstetrics and Gynecology, Faculty of Medicine, Ataturk University, Erzurum, Turkey
| | - Cengiz Ozturk
- Department of Anatomy, Erzurum Region Education and Research Hospital, Erzurum, Turkey
| | - Oguzhan Yarali
- Department of Medical Genetics, İstanbul Medeniyet University Goztepe Training and Research Hospital, Istanbul, Turkey
| | - Hamit Hakan Alp
- Department of Biochemistry, Faculty of Medicine, 100. Yil University, Van, Turkey
| | - Durdu Altuner
- Department of Pharmacology, Faculty of Medicine, Erzincan University, Erzincan, Turkey
| | - Bahadir Suleyman
- Department of Pharmacology, Faculty of Medicine, Erzincan University, Erzincan, Turkey
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16
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Smith CK, Vivekanandan-Giri A, Tang C, Knight JS, Mathew A, Padilla RL, Gillespie BW, Carmona-Rivera C, Liu X, Subramanian V, Hasni S, Thompson PR, Heinecke JW, Saran R, Pennathur S, Kaplan MJ. Neutrophil extracellular trap-derived enzymes oxidize high-density lipoprotein: an additional proatherogenic mechanism in systemic lupus erythematosus. Arthritis Rheumatol 2014; 66:2532-2544. [PMID: 24838349 DOI: 10.1002/art.38703] [Citation(s) in RCA: 142] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 05/08/2014] [Indexed: 12/13/2022]
Abstract
OBJECTIVE Oxidative stress and oxidized high-density lipoprotein (HDL) are implicated as risk factors for cardiovascular disease (CVD) in systemic lupus erythematosus (SLE). Yet, how HDL is oxidized and rendered dysfunctional in SLE remains unclear. Neutrophil extracellular traps (NETs), the levels of which are elevated in lupus, possess oxidant-generating enzymes, including myeloperoxidase (MPO), NADPH oxidase (NOX), and nitric oxide synthase (NOS). We hypothesized that NETs mediate HDL oxidation, impairing cholesterol efflux capacity (CEC). METHODS Plasma MPO levels and CEC activity were examined in controls and lupus patients, and 3-chlorotyrosine (MPO specific) and 3-nitrotyrosine (derived from reactive nitrogen species) were quantified in human HDL. Multivariable linear models were used to estimate and test differences between groups. HDL was exposed to NETs from control and lupus neutrophils in the presence or absence of MPO, NOX, NOS inhibitors, and chloroquine (CQ). Murine HDL oxidation was quantified after NET inhibition in vivo. RESULTS SLE patients displayed higher MPO levels and diminished CEC compared to controls. SLE HDL had higher 3-nitrotyrosine and 3-chlorotyrosine content than control HDL, with site-specific oxidation signatures on apolipoprotein A-I. Experiments with human and murine NETs confirmed that chlorination was mediated by MPO and NOX, and nitration by NOS and NOX. Mice with lupus treated with the NET inhibitor Cl-amidine displayed significantly decreased HDL oxidation. CQ inhibited NET formation in vitro. CONCLUSION Active NOS, NOX, and MPO within NETs significantly modify HDL, rendering the lipoprotein proatherogenic. Since NET formation is enhanced in SLE, these findings support a novel role for NET-derived lipoprotein oxidation in SLE-associated CVD and identify additional proatherogenic roles of neutrophils and putative protective roles of antimalarials in autoimmunity.
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Affiliation(s)
- Carolyne K Smith
- Systemic Autoimmunity Branch, Intramural Research Program, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD 20892
| | | | - Chongren Tang
- Department of Medicine and Diabetes and Obesity Center of Excellence, University of Washington, Seattle, WA 98109
| | - Jason S Knight
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109
| | - Anna Mathew
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109
| | - Robin L Padilla
- Kidney Epidemiology and Cost Center and Biostatistics, University of Michigan, Ann Arbor, MI 48109
| | - Brenda W Gillespie
- Kidney Epidemiology and Cost Center and Biostatistics, University of Michigan, Ann Arbor, MI 48109
| | - Carmelo Carmona-Rivera
- Systemic Autoimmunity Branch, Intramural Research Program, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Xiaodan Liu
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109
| | | | - Sarfaraz Hasni
- Systemic Autoimmunity Branch, Intramural Research Program, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD 20892
| | | | - Jay W Heinecke
- Department of Medicine and Diabetes and Obesity Center of Excellence, University of Washington, Seattle, WA 98109
| | - Rajiv Saran
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109.,Kidney Epidemiology and Cost Center and Biostatistics, University of Michigan, Ann Arbor, MI 48109
| | | | - Mariana J Kaplan
- Systemic Autoimmunity Branch, Intramural Research Program, National Institute of Arthritis and Musculoskeletal and Skin Diseases, National Institutes of Health, Bethesda, MD 20892
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Panasenko OM, Gorudko IV, Sokolov AV. Hypochlorous acid as a precursor of free radicals in living systems. BIOCHEMISTRY (MOSCOW) 2014; 78:1466-89. [PMID: 24490735 DOI: 10.1134/s0006297913130075] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hypochlorous acid (HOCl) is produced in the human body by the family of mammalian heme peroxidases, mainly by myeloperoxidase, which is secreted by neutrophils and monocytes at sites of inflammation. This review discusses the reactions that occur between HOCl and the major classes of biologically important molecules (amino acids, proteins, nucleotides, nucleic acids, carbohydrates, lipids, and inorganic substances) to form free radicals. The generation of such free radical intermediates by HOCl and other reactive halogen species is accompanied by the development of halogenative stress, which causes a number of socially important diseases, such as cardiovascular, neurodegenerative, infectious, and other diseases usually associated with inflammatory response and characterized by the appearance of biomarkers of myeloperoxidase and halogenative stress. Investigations aimed at elucidating the mechanisms regulating the activity of enzyme systems that are responsible for the production of reactive halogen species are a crucial step in opening possibilities for control of the development of the body's inflammatory response.
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Affiliation(s)
- O M Panasenko
- Research Institute of Physico-Chemical Medicine, Moscow, 119435, Russia.
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18
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Ganji SH, Kamanna VS, Kashyap ML. Niacin decreases leukocyte myeloperoxidase: mechanistic role of redox agents and Src/p38MAP kinase. Atherosclerosis 2014; 235:554-61. [PMID: 24956528 DOI: 10.1016/j.atherosclerosis.2014.05.948] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 05/15/2014] [Accepted: 05/24/2014] [Indexed: 11/27/2022]
Abstract
OBJECTIVES Leukocyte myeloperoxidase (MPO) is a major player in the pathogenesis of various chronic diseases including atherosclerosis. This study proposes the novel concept that niacin, through reactive oxygen species (ROS)-mediated signaling, decreases neutrophil MPO release and its activity, protects apolipoprotein-AI (apo-AI) modification and improves HDL function. METHODS Human blood leukocytes and leukocytic cell line HL-60 cells were treated with niacin, and stimulated with phorbol myristate acetate (PMA). Cellular and released MPO activity in the medium was measured by assessing chlorination of MPO-specific substrate. MPO protein release in the medium and apo-AI degradation was measured by Western blot analysis. Monocyte adhesion to human aortic primary endothelial cells was measured to assess biological function of HDL/apo-AI. RESULTS PMA significantly increased leukocyte MPO activity in both intracellular extract and medium. Niacin (0.25-0.5 mM) decreased PMA-induced MPO activity (cellular and released in the media). Niacin also decreased MPO protein mass in the medium without affecting its mRNA expression. Increased NADPH oxidase and ROS production by PMA were also significantly inhibited by niacin. Studies with specific inhibitors suggest that ROS-dependent Src and p38MAP kinase mediate decreased MPO activity by niacin. Niacin blocked apo-AI degradation, and apo-AI from niacin treated cells decreased monocyte adhesion to aortic endothelial cells. CONCLUSIONS These findings identify niacin as a potent inhibitor of leukocyte MPO release and MPO-mediated formation of dysfunctional HDL. Niacin and niacin-related chemical entities may form important therapeutic agents for MPO-mediated inflammatory diseases.
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Affiliation(s)
- Shobha H Ganji
- Atherosclerosis Research Center, Department of Veterans Affairs Healthcare System, Long Beach, CA, USA; The University of California, Irvine, CA, USA
| | - Vaijinath S Kamanna
- Atherosclerosis Research Center, Department of Veterans Affairs Healthcare System, Long Beach, CA, USA; The University of California, Irvine, CA, USA.
| | - Moti L Kashyap
- Atherosclerosis Research Center, Department of Veterans Affairs Healthcare System, Long Beach, CA, USA; The University of California, Irvine, CA, USA.
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19
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Sigalov AB. A novel ligand-independent peptide inhibitor of TREM-1 suppresses tumor growth in human lung cancer xenografts and prolongs survival of mice with lipopolysaccharide-induced septic shock. Int Immunopharmacol 2014; 21:208-19. [PMID: 24836682 DOI: 10.1016/j.intimp.2014.05.001] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2014] [Revised: 04/29/2014] [Accepted: 05/01/2014] [Indexed: 10/25/2022]
Abstract
Triggering receptor expressed on myeloid cells-1 (TREM-1) amplifies the inflammatory response and plays a role in cancer and sepsis. Inhibition of TREM-1 by short hairpin RNA (shRNA) in macrophages suppresses cancer cell invasion in vitro. In the clinical setting, high levels of TREM-1 expression on tumor-associated macrophages are associated with cancer recurrence and poor survival of patients with non-small cell lung cancer (NSCLC). TREM-1 upregulation on peritoneal neutrophils has been found in human sepsis patients and in mice with experimental lipopolysaccharide (LPS)-induced septic shock. However, the precise function of TREM-1 and the nature of its ligand are not yet known. In this study, we used the signaling chain homooligomerization (SCHOOL) model of immune signaling to design a novel, ligand-independent peptide-based TREM-1 inhibitor and demonstrated that this peptide specifically silences TREM-1 signaling in vitro and in vivo. Utilizing two human lung tumor xenograft nude mouse models (H292 and A549) and mice with LPS-induced sepsis, we show for the first time that blockade of TREM-1 function using non-toxic and non-immunogenic SCHOOL peptide inhibitors: 1) delays tumor growth in xenograft models of human NSCLC, 2) prolongs survival of mice with LPS-induced septic shock, and 3) substantially decreases cytokine production in vitro and in vivo. In addition, targeted delivery of SCHOOL peptides to macrophages utilizing lipoprotein-mimicking nanoparticles significantly increased peptide half-life and dosage efficacy. Together, the results suggest that ligand-independent modulation of TREM-1 function using small synthetic peptides might be a suitable treatment for sepsis and NSCLC and possibly other types of inflammation-associated disorders.
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20
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Sigalov AB. Nature-inspired nanoformulations for contrast-enhanced in vivo MR imaging of macrophages. CONTRAST MEDIA & MOLECULAR IMAGING 2014; 9:372-82. [PMID: 24729189 DOI: 10.1002/cmmi.1587] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 10/25/2013] [Accepted: 11/18/2013] [Indexed: 12/20/2022]
Abstract
Magnetic resonance imaging (MRI) of macrophages in atherosclerosis requires the use of contrast-enhancing agents. Reconstituted lipoprotein particles that mimic native high-density lipoproteins (HDL) are a versatile delivery platform for Gd-based contrast agents (GBCA) but require targeting moieties to direct the particles to macrophages. In this study, a naturally occurring methionine oxidation in the major HDL protein, apolipoprotein (apo) A-I, was exploited as a novel way to target HDL to macrophages. We also tested if fully functional GBCA-HDL can be generated using synthetic apo A-I peptides. The fluorescence and MRI studies reveal that specific oxidation of apo A-I or its peptides increases the in vitro macrophage uptake of GBCA-HDL by 2-3 times. The in vivo imaging studies using an apo E-deficient mouse model of atherosclerosis and a 3.0 T MRI system demonstrate that this modification significantly improves atherosclerotic plaque detection using GBCA-HDL. At 24 h post-injection of 0.05 mmol Gd kg(-1) GBCA-HDL containing oxidized apo A-I or its peptides, the atherosclerotic wall/muscle normalized enhancement ratios were 90 and 120%, respectively, while those of GBCA-HDL containing their unmodified counterparts were 35 and 45%, respectively. Confocal fluorescence microscopy confirms the accumulation of GBCA-HDL containing oxidized apo A-I or its peptides in intraplaque macrophages. Together, the results of this study confirm the hypothesis that specific oxidation of apo A-I targets GBCA-HDL to macrophages in vitro and in vivo. Furthermore, our observation that synthetic peptides can functionally replace the native apo A-I protein in HDL further encourages the development of these contrast agents for macrophage imaging.
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Pu K, Shuhendler AJ, Rao J. Semiconducting polymer nanoprobe for in vivo imaging of reactive oxygen and nitrogen species. Angew Chem Int Ed Engl 2013; 52:10325-9. [PMID: 23943508 DOI: 10.1002/anie.201303420] [Citation(s) in RCA: 195] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 07/14/2013] [Indexed: 12/26/2022]
Affiliation(s)
- Kanyi Pu
- Molecular Imaging Program at Stanford, Departments of Radiology and Chemistry, Stanford University, 1201 Welch Road, Stanford, CA 94305-5484 (USA)
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Pu K, Shuhendler AJ, Rao J. Semiconducting Polymer Nanoprobe for In Vivo Imaging of Reactive Oxygen and Nitrogen Species. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303420] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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23
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Oxidant/antioxidant status in cases of snake bite. J Emerg Med 2013; 45:39-45. [PMID: 23623287 DOI: 10.1016/j.jemermed.2012.11.097] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 07/14/2012] [Accepted: 11/04/2012] [Indexed: 11/21/2022]
Abstract
BACKGROUND Snake bites are an important cause of mortality and morbidity worldwide, especially in rural areas. OBJECTIVE The aim of this study was to investigate serum paraoxonase (PON), arylesterase (ARLY), ceruloplasmin (Cp), and myeloperoxidase (MPO) activity and lipid hydroperoxide (LOOH) and total sulfhydryl group (-SH) levels in patients with snake venom poisoning. METHODS The study included 49 patients with snake bite envenomation (Group 1) and 39 healthy volunteers as the control group (Group 2). Plasma PON, ARLY, Cp, and MPO activity and LOOH and -SH levels were measured. Laboratory measurements of 20 patients with snake bite envenomation (Group 3) were performed again after treatment. RESULTS PON and ARLY activity and -SH levels were significantly decreased in Group 1 compared with those in Group 2. Cp and MPO activity and LOOH levels were significantly elevated in Group 1 compared with those in Group 2. PON and ARLY activity were significantly elevated in Group 3 compared with those in Group 1. Cp and MPO activity and LOOH levels were significantly decreased in Group 3 compared with those in Group 1. CONCLUSIONS Patients with snake bite envenomation had increased oxidants (MPO and LOOH) and decreased antioxidants (PON, ARLY, and -SH). Results obtained in this study demonstrate that snake bites are associated with a shift to oxidative status. Therapy with antioxidants can lead to an increase in the antioxidant defense system, and thus improvements in clinical symptoms.
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Li TT, Zhang YS, He L, Liu B, Shi RZ, Zhang GG, Peng J. Inhibition of vascular peroxidase alleviates cardiac dysfunction and apoptosis induced by ischemia–reperfusion. Can J Physiol Pharmacol 2012; 90:851-62. [PMID: 22702833 DOI: 10.1139/y2012-066] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Myeloperoxidase (MPO) is involved in myocardial ischemia–reperfusion (IR) injury and vascular peroxidase (VPO) is a newly identified isoform of MPO. This study was conducted to explore whether VPO is involved in IR-induced cardiac dysfunction and apoptosis. In a rat Langendorff model of myocardial IR, the cardiac function parameters (left ventricular pressure and the maximum derivatives of left ventricular pressure and coronary flow), creatine kinase (CK) activity, apoptosis, VPO1 activity were measured. In a cell (rat-heart-derived H9c2 cells) model of hypoxia–reoxygenation (HR), apoptosis, VPO activity, and VPO1 mRNA expression were examined. In isolated heart, IR caused a marked decrease in cardiac function and a significant increase in apoptosis, CK, and VPO activity. These effects were attenuated by pharmacologic inhibition of VPO. In vitro, pharmacologic inhibition of VPO activity or silencing of VPO1 expression significantly suppressed HR-induced cellular apoptosis. Our results suggest that increased VPO activity contributes to IR-induced cardiac dysfunction and inhibition of VPO activity may have the potential clinical value in protecting the myocardium against IR injury.
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Affiliation(s)
- Ting-Ting Li
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, No. 110 Xiang-Ya Road, Changsha 410078, P.R. China
- Department of Pharmacy, Xishuangbanna Dai Autonomous State People’s Hospital, Jinghong 666100, P.R. China
| | - Yi-Shuai Zhang
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, No. 110 Xiang-Ya Road, Changsha 410078, P.R. China
| | - Lan He
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, No. 110 Xiang-Ya Road, Changsha 410078, P.R. China
| | - Bin Liu
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, No. 110 Xiang-Ya Road, Changsha 410078, P.R. China
| | - Rui-Zheng Shi
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, P.R. China
| | - Guo-Gang Zhang
- Department of Cardiovascular Medicine, Xiangya Hospital, Central South University, Changsha 410008, P.R. China
| | - Jun Peng
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, No. 110 Xiang-Ya Road, Changsha 410078, P.R. China
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Yuan L, Lin W, Yang Y, Chen H. A Unique Class of Near-Infrared Functional Fluorescent Dyes with Carboxylic-Acid-Modulated Fluorescence ON/OFF Switching: Rational Design, Synthesis, Optical Properties, Theoretical Calculations, and Applications for Fluorescence Imaging in Living Animals. J Am Chem Soc 2012; 134:1200-11. [DOI: 10.1021/ja209292b] [Citation(s) in RCA: 397] [Impact Index Per Article: 33.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Lin Yuan
- State Key Laboratory of Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha
410082, P. R. China
| | - Weiying Lin
- State Key Laboratory of Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha
410082, P. R. China
| | - Yueting Yang
- State Key Laboratory of Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha
410082, P. R. China
| | - Hua Chen
- State Key Laboratory of Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha
410082, P. R. China
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26
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Ramella NA, Rimoldi OJ, Prieto ED, Schinella GR, Sanchez SA, Jaureguiberry MS, Vela ME, Ferreira ST, Tricerri MA. Human apolipoprotein A-I-derived amyloid: its association with atherosclerosis. PLoS One 2011; 6:e22532. [PMID: 21811627 PMCID: PMC3139661 DOI: 10.1371/journal.pone.0022532] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Accepted: 06/23/2011] [Indexed: 01/08/2023] Open
Abstract
Amyloidoses constitute a group of diseases in which soluble proteins aggregate and deposit extracellularly in tissues. Nonhereditary apolipoprotein A-I (apoA-I) amyloid is characterized by deposits of nonvariant protein in atherosclerotic arteries. Despite being common, little is known about the pathogenesis and significance of apoA-I deposition. In this work we investigated by fluorescence and biochemical approaches the impact of a cellular microenvironment associated with chronic inflammation on the folding and pro-amyloidogenic processing of apoA-I. Results showed that mildly acidic pH promotes misfolding, aggregation, and increased binding of apoA-I to extracellular matrix elements, thus favoring protein deposition as amyloid like-complexes. In addition, activated neutrophils and oxidative/proteolytic cleavage of the protein give rise to pro amyloidogenic products. We conclude that, even though apoA-I is not inherently amyloidogenic, it may produce non hereditary amyloidosis as a consequence of the pro-inflammatory microenvironment associated to atherogenesis.
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Affiliation(s)
- Nahuel A. Ramella
- Instituto de Investigaciones Bioquímicas La Plata (INIBIOLP), CCT-CONICET, La Plata, Argentina
- Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Omar J. Rimoldi
- Instituto de Investigaciones Bioquímicas La Plata (INIBIOLP), CCT-CONICET, La Plata, Argentina
- Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Eduardo D. Prieto
- Instituto de Investigaciones Bioquímicas La Plata (INIBIOLP), CCT-CONICET, La Plata, Argentina
- Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Guillermo R. Schinella
- Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - Susana A. Sanchez
- Laboratory for Fluorescence Dynamics, University of California Irvine, Irvine, California, United States of America
- Microscopy Unit, Fundación CNIC-Carlos III, Centro Nacional de Investigaciones Cardiovasculares, Madrid, España
| | - María S. Jaureguiberry
- Instituto de Investigaciones Bioquímicas La Plata (INIBIOLP), CCT-CONICET, La Plata, Argentina
- Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
| | - María E. Vela
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Universidad Nacional de La Plata-CCT-CONICET, La Plata, Argentina
| | - Sergio T. Ferreira
- Program in Biochemistry and Cellular Biophysics, Institute of Medical Biochemistry, Federal University of Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil
| | - M. Alejandra Tricerri
- Instituto de Investigaciones Bioquímicas La Plata (INIBIOLP), CCT-CONICET, La Plata, Argentina
- Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina
- * E-mail:
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Malik P, Berisha SZ, Santore J, Agatisa-Boyle C, Brubaker G, Smith JD. Zymosan-mediated inflammation impairs in vivo reverse cholesterol transport. J Lipid Res 2011; 52:951-7. [PMID: 21335620 DOI: 10.1194/jlr.m011122] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Inflammation has been proposed to impair HDL function and reverse cholesterol transport (RCT). We investigated the effects of inflammation mediated by zymosan, a yeast glucan, on multiple steps along the RCT pathway in vivo and ex vivo. Acute inflammation with 70 mg/kg zymosan impaired RCT to plasma, liver, and feces similarly by 17-22% (P < 0.05), with no additional block at the liver. Hepatic gene expression further demonstrated no change in ABCG5, ABCB4, and ABCB11 expression but a decline in ABCG8 mRNA (32% P < 0.05). Plasma from zymosan-treated mice had a 21% decrease in cholesterol acceptor ability (P < 0.01) and a 35% decrease in ABCA1-specific efflux capacity (P < 0.01) in vitro. Zymosan treatment also decreased HDL levels and led to HDL remodeling with increased incorporation of serum amyloid A. In addition, cholesterol efflux from cultured macrophages declined with zymosan treatment in a dose dependent manner. Taken together, our results suggest that zymosan impairs in vivo RCT primarily by decreasing macrophage-derived cholesterol entering the plasma, with minimal additional blocks downstream. Our study supports the notion that RCT impairment is one of the mechanisms for the increased atherosclerotic burden observed in inflammatory conditions.
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Affiliation(s)
- Priya Malik
- Department of Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
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28
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Davies MJ, Hawkins CL, Pattison DI, Rees MD. Mammalian heme peroxidases: from molecular mechanisms to health implications. Antioxid Redox Signal 2008; 10:1199-234. [PMID: 18331199 DOI: 10.1089/ars.2007.1927] [Citation(s) in RCA: 421] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A marked increase in interest has occurred over the last few years in the role that mammalian heme peroxidase enzymes, primarily myeloperoxidase, eosinophil peroxidase, and lactoperoxidase, may play in both disease prevention and human pathologies. This increased interest has been sparked by developments in our understanding of polymorphisms that control the levels of these enzymes, a greater understanding of the basic chemistry and biochemistry of the oxidants formed by these species, the development of specific biomarkers that can be used in vivo to detect damage induced by these oxidants, the detection of active forms of these peroxidases at most, if not all, sites of inflammation, and a correlation between the levels of these enzymes and a number of major human pathologies. This article reviews recent developments in our understanding of the enzymology, chemistry, biochemistry and biologic roles of mammalian peroxidases and the oxidants that they generate, the potential role of these oxidants in human disease, and the use of the levels of these enzymes in disease prognosis.
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Affiliation(s)
- Michael J Davies
- The Heart Research Institute, Camperdown, University of Sydney, Sydney, Australia., Faculty of Medicine, University of Sydney, Sydney, Australia.
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29
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Shepherd J, Hilderbrand SA, Waterman P, Heinecke JW, Weissleder R, Libby P. A fluorescent probe for the detection of myeloperoxidase activity in atherosclerosis-associated macrophages. ACTA ACUST UNITED AC 2008; 14:1221-31. [PMID: 18022561 DOI: 10.1016/j.chembiol.2007.10.005] [Citation(s) in RCA: 226] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2007] [Revised: 10/03/2007] [Accepted: 10/03/2007] [Indexed: 11/26/2022]
Abstract
The myeloperoxidase (MPO)-derived oxidant hypochlorous acid (HOCl/OCl(-)) is implicated in the pathogenesis of atherosclerosis and other inflammatory states. We have synthesized an imaging probe, sulfonaphthoaminophenyl fluorescein (SNAPF), that selectively reacts with HOCl. SNAPF detects HOCl produced by stimulated MPO-expressing cells cultured from human whole blood, as well as HOCl from bone marrow (BM)-derived macrophages isolated from transgenic mice that express human MPO. Two lines of evidence indicate that SNAPF permits the in vivo imaging of HOCl production. First, we used this approach to demonstrate HOCl production by neutrophils in experimental murine peritonitis. Second, we detected HOCl production by MPO expressing cells in human atherosclerotic arteries. Thus, fluorescence reflectance imaging by SNAPF may provide a valuable noninvasive molecular imaging tool for implicating HOCl and MPO in the damage of inflamed tissues.
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Affiliation(s)
- Joanna Shepherd
- Department of Medicine, Cardiovascular Division, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02215, USA
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30
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Marsche G, Frank S, Raynes J, Kozarsky K, Sattler W, Malle E. The lipidation status of acute-phase protein serum amyloid A determines cholesterol mobilization via scavenger receptor class B, type I. Biochem J 2007; 402:117-24. [PMID: 17034364 PMCID: PMC1783981 DOI: 10.1042/bj20061406] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
During the acute-phase reaction, SAA (serum amyloid A) replaces apoA-I (apolipoprotein A-I) as the major HDL (high-density lipoprotein)-associated apolipoprotein. A remarkable portion of SAA exists in a lipid-free/lipid-poor form and promotes ABCA1 (ATP-binding cassette transporter A1)-dependent cellular cholesterol efflux. In contrast with lipid-free apoA-I and apoE, lipid-free SAA was recently reported to mobilize SR-BI (scavenger receptor class B, type I)-dependent cellular cholesterol efflux [Van der Westhuyzen, Cai, de Beer and de Beer (2005) J. Biol. Chem. 280, 35890-35895]. This unique property could strongly affect cellular cholesterol mobilization during inflammation. However, in the present study, we show that overexpression of SR-BI in HEK-293 cells (human embryonic kidney cells) (devoid of ABCA1) failed to mobilize cholesterol to lipid-free or lipid-poor SAA. Only reconstituted vesicles containing phospholipids and SAA promoted SR-BI-mediated cholesterol efflux. Cholesterol efflux from HEK-293 and HEK-293[SR-BI] cells to lipid-free and lipid-poor SAA was minimal, while efficient efflux was observed from fibroblasts and CHO cells (Chinese-hamster ovary cells) both expressing functional ABCA1. Overexpression of SR-BI in CHO cells strongly attenuated cholesterol efflux to lipid-free SAA even in the presence of an SR-BI-blocking IgG. This implies that SR-BI attenuates ABCA1-mediated cholesterol efflux in a way that is not dependent on SR-BI-mediated re-uptake of cholesterol. The present in vitro experiments demonstrate that the lipidation status of SAA is a critical factor governing cholesterol acceptor properties of this amphipathic apolipoprotein. In addition, we demonstrate that SAA mediates cellular cholesterol efflux via the ABCA1 and/or SR-BI pathway in a similar way to apoA-I.
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Affiliation(s)
- Gunther Marsche
- *Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, A-8010 Graz, Austria
| | - Sǎsa Frank
- *Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, A-8010 Graz, Austria
| | - John G. Raynes
- †Immunology Unit, Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, U.K
| | - Karen F. Kozarsky
- ‡GlaxoSmithKline, 709 Swedeland Rd, King of Prussia, PA 19406, U.S.A
| | - Wolfgang Sattler
- *Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, A-8010 Graz, Austria
| | - Ernst Malle
- *Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University of Graz, A-8010 Graz, Austria
- To whom correspondence should be addressed (email )
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31
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Exner M, Minar E, Mlekusch W, Sabeti S, Amighi J, Lalouschek W, Maurer G, Bieglmayer C, Kieweg H, Wagner O, Schillinger M. Myeloperoxidase Predicts Progression of Carotid Stenosis in States of Low High-Density Lipoprotein Cholesterol. J Am Coll Cardiol 2006; 47:2212-8. [PMID: 16750686 DOI: 10.1016/j.jacc.2006.01.067] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2005] [Revised: 01/11/2006] [Accepted: 01/16/2006] [Indexed: 11/25/2022]
Abstract
OBJECTIVES We investigated the effect of myeloperoxidase (MPO) on progression of carotid stenosis in states of high and low high-density lipoprotein-cholesterol (HDL-C) and low-density lipoprotein-cholesterol (LDL-C) levels. BACKGROUND Myeloperoxidase is pivotally involved in the pathogenesis of atherosclerosis. In vitro data suggest that MPO exerts deleterious effects via oxidative modulation of lipoproteins. METHODS We prospectively studied 1,019 of 1,268 consecutive patients who were asymptomatic with respect to carotid artery disease. Patients underwent serial carotid ultrasound investigations at baseline and after a follow-up interval of median 7.5 months (range 6 to 9 months), categorizing carotid arteries as 0% to 29%, 30% to 49%, 50% to 69%, 70% to 89%, or 90% to 99% stenosed or occluded. The MPO, HDL-C, and LDL-C levels were measured at baseline, grouped by medians, and correlated with progression of carotid atherosclerosis. RESULTS Progression of carotid atherosclerosis was found in 100 of 1,019 patients (9.8%). Myeloperoxidase (p = 0.014) but not HDL-C (p = 0.95) or LDL-C (p = 0.30) were associated with progressive disease. However, MPO > or =310 ng/ml was significantly associated with progressive disease (adjusted odds ratio [OR] 2.57, 95% confidence interval [CI] 1.39 to 4.75) only in patients with HDL-C levels <49 mg/dl. Otherwise, in patients with higher HDL-C levels (> or =49 mg/dl), MPO > or =310 ng/ml did not predict disease progression (adjusted OR 1.42, 95% CI 0.72 to 2.78). No interaction of MPO with LDL-C was observed. CONCLUSIONS Myeloperoxidase was associated with progression of carotid atherosclerosis in patients with HDL cholesterol levels below 49 mg/dl.
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Affiliation(s)
- Markus Exner
- Department of Medical and Chemical Laboratory Diagnostics, Medical University Vienna, Vienna, Austria
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32
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Thabut D, Naveau S, Charlotte F, Massard J, Ratziu V, Imbert-Bismut F, Cazals-Hatem D, Abella A, Messous D, Beuzen F, Munteanu M, Taieb J, Moreau R, Lebrec D, Poynard T. The diagnostic value of biomarkers (AshTest) for the prediction of alcoholic steato-hepatitis in patients with chronic alcoholic liver disease. J Hepatol 2006; 44:1175-85. [PMID: 16580087 DOI: 10.1016/j.jhep.2006.02.010] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2005] [Revised: 01/28/2006] [Accepted: 02/09/2006] [Indexed: 12/20/2022]
Abstract
BACKGROUND/AIMS The aim was to identify a panel of biomarkers (AshTest) for the diagnosis of alcoholic steato-hepatitis (ASH), in patients with chronic alcoholic liver disease. METHODS Biomarkers were assessed in patients with an alcohol intake>50 g/d, in a training group, and in two validation groups. Diagnosis of ASH (polymorphonuclear infiltrate and hepatocellular necrosis) and its histological severity (four classes: none, mild, moderate and severe) were assessed blindly. RESULTS Two hundred and twenty-five patients were included, 70 in the training group, 155 in the validation groups, and 299 controls. AshTest was constructed using a combination of the six components of FibroTest-ActiTest plus aspartate aminotransferase. The AshTest area under the ROC curves for moderate-severe ASH was 0.90 in the training group, 0.88 and 0.89 in the validation groups. The median AshTest value was 0.005 in controls, 0.05 in patients without or with mild ASH, 0.64 in moderate, and 0.84 in severe ASH grade 3, (P<0.05 between all groups). At a 0.50 cut-off, the sensitivity of AshTest was 0.80 and the specificity was 0.84. CONCLUSIONS In heavy drinkers, AshTest is a simple and non-invasive quantitative estimate of alcoholic hepatitis. The use of AshTest may reduce the need for liver biopsy, and therefore allow an earlier treatment of alcoholic hepatitis.
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Affiliation(s)
- Dominique Thabut
- Department of Hepato-Gastroenterology, Groupe Hospitalier Pitié-Salpêtrière, 47-83 Boulevard de l'Hôpital, 75651 CNRS UMR 8149, Paris Cedex 13, France
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33
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Malle E, Marsche G, Panzenboeck U, Sattler W. Myeloperoxidase-mediated oxidation of high-density lipoproteins: Fingerprints of newly recognized potential proatherogenic lipoproteins. Arch Biochem Biophys 2006; 445:245-55. [PMID: 16171772 DOI: 10.1016/j.abb.2005.08.008] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2005] [Revised: 08/03/2005] [Accepted: 08/10/2005] [Indexed: 01/23/2023]
Abstract
Substantial evidence supports the notion that oxidative processes participate in the pathogenesis of atherosclerotic heart disease. Major evidence for myeloperoxidase (MPO) as enzymatic catalyst for oxidative modification of lipoproteins in the artery wall has been suggested in numerous studies performed with low-density lipoprotein. In contrast to low-density lipoprotein, plasma levels of high-density lipoprotein (HDL)-cholesterol and apoAI, the major apolipoprotein of HDL, inversely correlate with the risk of developing coronary artery disease. These antiatherosclerotic effects are attributed mainly to HDL's capacity to transport excess cholesterol from arterial wall cells to the liver during 'reverse cholesterol transport'. There is now strong evidence that HDL is a selective in vivo target for MPO-catalyzed oxidation impairing the cardioprotective and antiinflammatory capacity of this antiatherogenic lipoprotein. MPO is enzymatically active in human lesion material and was found to be associated with HDL extracted from human atheroma. MPO-catalyzed oxidation products are highly enriched in circulating HDL from individuals with cardiovascular disease where MPO concentrations are also increased. The oxidative potential of MPO involves an array of intermediate-generated reactive oxygen and reactive nitrogen species and the ability of MPO to generate chlorinating oxidants-in particular hypochlorous acid/hypochlorite-under physiological conditions is a unique and defining activity for this enzyme. All these MPO-generated reactive products may affect structure and function of HDL as well as the activity of HDL-associated enzymes involved in conversion and remodeling of the lipoprotein particle, and represent clinically useful markers for atherosclerosis.
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Affiliation(s)
- Ernst Malle
- Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University Graz, A-8010 Graz, Austria.
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34
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Peng DQ, Wu Z, Brubaker G, Zheng L, Settle M, Gross E, Kinter M, Hazen SL, Smith JD. Tyrosine modification is not required for myeloperoxidase-induced loss of apolipoprotein A-I functional activities. J Biol Chem 2005; 280:33775-84. [PMID: 16091367 DOI: 10.1074/jbc.m504092200] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Apolipoprotein A-I (apoAI), the major protein of high density lipoprotein, plays an important role in reverse cholesterol transport via its activity as an ABCA1-dependent acceptor of cellular cholesterol. We reported recently that myeloperoxidase (MPO) modification of apoAI inhibits its ABCA1-dependent cholesterol acceptor activity (Zheng, L., Nukuna, B., Brennan, M. L., Sun, M., Goormastic, M., Settle, M., Schmitt, D., Fu, X., Thomson, L., Fox, P. L., Ischiropoulos, H., Smith, J. D., Kinter, M., and Hazen, S. L. (2004) J. Clin. Invest. 114, 529-541). We also reported that MPO-mediated chlorination preferentially modifies two of the seven tyrosines in apoAI, and loss of parent peptides containing these residues dose-dependently correlates with loss in ABCA1-mediated cholesterol acceptor activity (Zheng, L., Settle, M., Brubaker, G., Schmitt, D., Hazen, S. L., Smith, J. D., and Kinter, M. (2005) J. Biol. Chem. 280, 38-47). To determine whether oxidative modification of apoA-I tyrosine residues was responsible for the MPO-mediated inactivation of cholesterol acceptor activity, we made recombinant apoAI with site-specific substitutions of all seven tyrosine residues to phenylalanine. ApoAI and the tyrosine-free apoAI were equally susceptible to dose-dependent MPO-mediated loss of ABCA1-dependent cholesterol acceptor activity, as well as lipid binding activity. MPO modification altered the migration of apoAI on SDS gels and decreased its alpha-helix content. MPO-induced modification also targeted apoAI tryptophan and lysine residues. Specifically, we detected apoAI tryptophan oxidation to mono- and dihydroxytryptophan and apoAI lysine modification to chlorolysine and 2-aminoadipic acid. Thus, tyrosine modification of apoAI is not required for its MPO-mediated inhibition of cholesterol acceptor activity.
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Affiliation(s)
- Dao-Quan Peng
- Department of Cell Biology, The Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA
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Abstract
Myeloperoxidase (MPO) is a leukocyte-derived enzyme that catalyzes the formation of a number of reactive oxidant species. In addition to being an integral component of the innate immune response, evidence has emerged that MPO-derived oxidants contribute to tissue damage during inflammation. MPO-catalyzed reactions have been attributed to potentially proatherogenic biological activities throughout the evolution of cardiovascular disease, including during initiation, propagation, and acute complication phases of the atherosclerotic process. As a result, MPO and its downstream inflammatory pathways represent attractive targets for both prognostication and therapeutic intervention in the prophylaxis of atherosclerotic cardiovascular disease.
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Affiliation(s)
- Stephen J Nicholls
- Department of Cardiovascular Medicine and Center for Cardiovascular Diagnostics and Prevention, Cleveland Clinic Foundation, Cleveland, Ohio 44195, USA
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36
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Abstract
The mechanisms of atheroma formation and their ensuing complications and methods by which these can be detected have been the focus of several in vitro, in vivo, and clinical studies. Myeloperoxidase (MPO) is a microbicidal hemoprotein that serves as a part of the neutrophils' armory in host defense. However, the oxidation products generated by MPO have now been shown to be related to various stages of atheroma development. MPO and its oxidant products have been shown to be capable of modifying low-density lipoprotein cholesterol and to be enriched in human atheromas and rupture-prone plaques. Clinical studies have suggested an association between levels of MPO and the presence of coronary artery disease and endothelial dysfunction, and have shown a possible additional role to troponin in patients with chest pain.
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Affiliation(s)
- Vijay Nambi
- Section of Cardiology, Baylor College of Medicine, 6550 Fannin, SM 677, Houston, TX 77030, USA.
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37
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Abstract
Neutrophilic polymorphonuclear leukocytes (neutrophils) are highly specialized for their primary function, the phagocytosis and destruction of microorganisms. When coated with opsonins (generally complement and/or antibody), microorganisms bind to specific receptors on the surface of the phagocyte and invagination of the cell membrane occurs with the incorporation of the microorganism into an intracellular phagosome. There follows a burst of oxygen consumption, and much, if not all, of the extra oxygen consumed is converted to highly reactive oxygen species. In addition, the cytoplasmic granules discharge their contents into the phagosome, and death of the ingested microorganism soon follows. Among the antimicrobial systems formed in the phagosome is one consisting of myeloperoxidase (MPO), released into the phagosome during the degranulation process, hydrogen peroxide (H2O2), formed by the respiratory burst and a halide, particularly chloride. The initial product of the MPO-H2O2-chloride system is hypochlorous acid, and subsequent formation of chlorine, chloramines, hydroxyl radicals, singlet oxygen, and ozone has been proposed. These same toxic agents can be released to the outside of the cell, where they may attack normal tissue and thus contribute to the pathogenesis of disease. This review will consider the potential sources of H2O2 for the MPO-H2O2-halide system; the toxic products of the MPO system; the evidence for MPO involvement in the microbicidal activity of neutrophils; the involvement of MPO-independent antimicrobial systems; and the role of the MPO system in tissue injury. It is concluded that the MPO system plays an important role in the microbicidal activity of phagocytes.
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Affiliation(s)
- Seymour J Klebanoff
- Department of Medicine, University of Washington School of Medicine, Seattle, WA 98195-7185, USA.
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38
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Zheng L, Settle M, Brubaker G, Schmitt D, Hazen SL, Smith JD, Kinter M. Localization of Nitration and Chlorination Sites on Apolipoprotein A-I Catalyzed by Myeloperoxidase in Human Atheroma and Associated Oxidative Impairment in ABCA1-dependent Cholesterol Efflux from Macrophages. J Biol Chem 2005; 280:38-47. [PMID: 15498770 DOI: 10.1074/jbc.m407019200] [Citation(s) in RCA: 165] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We recently reported that apolipoprotein A-I (apoA-I), the major protein component of high density lipoprotein, is a selective target for myeloperoxidase (MPO)-catalyzed nitration and chlorination in both and serum of subjects with cardiovascular disease. We further showed that the extent of both apoA-I nitration and chlorination correlated with functional impairment in reverse cholesterol transport activity of the isolated lipoprotein. Herein we used tandem mass spectrometry to map the sites of MPO-mediated apoA-I nitration and chlorination in vitro and in vivo and to relate the degree of site-specific modifications to loss of apoA-I lipid binding and cholesterol efflux functions. Of the seven tyrosine residues in apoA-I, Tyr-192, Tyr-166, Tyr-236, and Tyr-29 were nitrated and chlorinated in MPO-mediated reactions. Site-specific liquid chromatography-mass spectrometry quantitative analyses demonstrated that the favored modification site following exposure to MPO-generated oxidants is Tyr-192. MPO-dependent nitration and chlorination both proceed with Tyr-166 as a secondary site and with Tyr-236 and Tyr-29 modified only minimally. Parallel functional studies demonstrated dose-dependent losses of ABCA1-dependent cholesterol acceptor and lipid binding activities with apoA-I modification by MPO. Finally tandem mass spectrometry analyses showed that apoA-I in human atherosclerotic tissue is nitrated at the MPO-preferred sites, Tyr-192 and Tyr-166. The present studies suggest that site-specific modifications of apoA-I by MPO are associated with impaired lipid binding and ABCA1-dependent cholesterol acceptor functions, providing a molecular mechanism that likely contributes to the clinical link between MPO levels and cardiovascular disease risk.
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Affiliation(s)
- Lemin Zheng
- Department of Cell Biology, Cleveland Clinic Foundation, Ohio 44195, USA
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Marsche G, Heller R, Fauler G, Kovacevic A, Nuszkowski A, Graier W, Sattler W, Malle E. 2-chlorohexadecanal derived from hypochlorite-modified high-density lipoprotein-associated plasmalogen is a natural inhibitor of endothelial nitric oxide biosynthesis. Arterioscler Thromb Vasc Biol 2004; 24:2302-6. [PMID: 15514213 DOI: 10.1161/01.atv.0000148703.43429.25] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Myeloperoxidase, a heme enzyme that is present and active in human atherosclerotic lesions, provides a source for the generation of proinflammatory chlorinated reactants contributing to endothelial dysfunction. Modification of high-density lipoprotein (HDL) by hypochlorous acid/hypochlorite (HOCl/OCl-) [correction]-generated in vivo by the myeloperoxidase-hydrogen peroxide-chloride system of activated phagocytes-forms a proatherogenic lipoprotein particle that binds to and is internalized by endothelial cells. METHODS AND RESULTS Here we show that HDL, modified with physiologically relevant HOCl concentrations, attenuates the expression and activity of vasculoprotective endothelial nitric oxide synthase. HOCl-HDL promotes dislocalization of endothelial nitric oxide synthase from the plasma membrane and perinuclear location of human umbilical venous endothelial cells. We could identify 2-chlorohexadecanal as the active component mediating this inhibitory activity. This chlorinated fatty aldehyde is formed during HOCl-mediated oxidative cleavage of HDL-associated plasmalogen. CONCLUSIONS 2-Chlorohexadecanal, produced by the myeloperoxidase-hydrogen peroxide-chloride system of activated phagocytes may act as a mediator of vascular injury associated with ischemia-reperfusion injury, glomerulosclerosis, and atherosclerosis.
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Affiliation(s)
- Gunther Marsche
- Institute of Molecular Biology and Biochemistry, Medical University Graz, Austria
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40
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Zheng L, Nukuna B, Brennan ML, Sun M, Goormastic M, Settle M, Schmitt D, Fu X, Thomson L, Fox PL, Ischiropoulos H, Smith JD, Kinter M, Hazen SL. Apolipoprotein A-I is a selective target for myeloperoxidase-catalyzed oxidation and functional impairment in subjects with cardiovascular disease. J Clin Invest 2004. [PMID: 15314690 DOI: 10.1172/jci200421109] [Citation(s) in RCA: 540] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
In recent studies we demonstrated that systemic levels of protein-bound nitrotyrosine (NO(2)Tyr) and myeloperoxidase (MPO), a protein that catalyzes generation of nitrating oxidants, serve as independent predictors of atherosclerotic risk, burden, and incident cardiac events. We now show both that apolipoprotein A-I (apoA-I), the primary protein constituent of HDL, is a selective target for MPO-catalyzed nitration and chlorination in vivo and that MPO-catalyzed oxidation of HDL and apoA-I results in selective inhibition in ABCA1-dependent cholesterol efflux from macrophages. Dramatic selective enrichment in NO(2)Tyr and chlorotyrosine (ClTyr) content within apoA-I recovered from serum and human atherosclerotic lesions is noted, and analysis of serum from sequential subjects demonstrates that the NO(2)Tyr and ClTyr contents of apoA-I are markedly higher in individuals with cardiovascular disease (CVD). Analysis of circulating HDL further reveals that higher NO(2)Tyr and ClTyr contents of the lipoprotein are each significantly associated with diminished ABCA1-dependent cholesterol efflux capacity of the lipoprotein. MPO as a likely mechanism for oxidative modification of apoA-I in vivo is apparently facilitated by MPO binding to apoA-I, as revealed by cross-immunoprecipitation studies in plasma, recovery of MPO within HDL-like particles isolated from human atheroma, and identification of a probable contact site between the apoA-I moiety of HDL and MPO. To our knowledge, the present results provide the first direct evidence for apoA-I as a selective target for MPO-catalyzed oxidative modification in human atheroma. They also suggest a potential mechanism for MPO-dependent generation of a proatherogenic dysfunctional form of HDL in vivo.
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Affiliation(s)
- Lemin Zheng
- Department of Cell Biology, Center for Cardiovascular Diagnostics and Prevention, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA
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41
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Zheng L, Nukuna B, Brennan ML, Sun M, Goormastic M, Settle M, Schmitt D, Fu X, Thomson L, Fox PL, Ischiropoulos H, Smith JD, Kinter M, Hazen SL. Apolipoprotein A-I is a selective target for myeloperoxidase-catalyzed oxidation and functional impairment in subjects with cardiovascular disease. J Clin Invest 2004; 114:529-41. [PMID: 15314690 PMCID: PMC503769 DOI: 10.1172/jci21109] [Citation(s) in RCA: 239] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2004] [Accepted: 07/08/2004] [Indexed: 12/18/2022] Open
Abstract
In recent studies we demonstrated that systemic levels of protein-bound nitrotyrosine (NO(2)Tyr) and myeloperoxidase (MPO), a protein that catalyzes generation of nitrating oxidants, serve as independent predictors of atherosclerotic risk, burden, and incident cardiac events. We now show both that apolipoprotein A-I (apoA-I), the primary protein constituent of HDL, is a selective target for MPO-catalyzed nitration and chlorination in vivo and that MPO-catalyzed oxidation of HDL and apoA-I results in selective inhibition in ABCA1-dependent cholesterol efflux from macrophages. Dramatic selective enrichment in NO(2)Tyr and chlorotyrosine (ClTyr) content within apoA-I recovered from serum and human atherosclerotic lesions is noted, and analysis of serum from sequential subjects demonstrates that the NO(2)Tyr and ClTyr contents of apoA-I are markedly higher in individuals with cardiovascular disease (CVD). Analysis of circulating HDL further reveals that higher NO(2)Tyr and ClTyr contents of the lipoprotein are each significantly associated with diminished ABCA1-dependent cholesterol efflux capacity of the lipoprotein. MPO as a likely mechanism for oxidative modification of apoA-I in vivo is apparently facilitated by MPO binding to apoA-I, as revealed by cross-immunoprecipitation studies in plasma, recovery of MPO within HDL-like particles isolated from human atheroma, and identification of a probable contact site between the apoA-I moiety of HDL and MPO. To our knowledge, the present results provide the first direct evidence for apoA-I as a selective target for MPO-catalyzed oxidative modification in human atheroma. They also suggest a potential mechanism for MPO-dependent generation of a proatherogenic dysfunctional form of HDL in vivo.
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Affiliation(s)
- Lemin Zheng
- Department of Cell Biology, Center for Cardiovascular Diagnostics and Prevention, Cleveland Clinic Foundation, 9500 Euclid Avenue, Cleveland, OH 44195, USA
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42
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Chapman ALP, Winterbourn CC, Brennan SO, Jordan TW, Kettle AJ. Characterization of non-covalent oligomers of proteins treated with hypochlorous acid. Biochem J 2003; 375:33-40. [PMID: 12852783 PMCID: PMC1223668 DOI: 10.1042/bj20030685] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2003] [Revised: 06/30/2003] [Accepted: 07/09/2003] [Indexed: 01/09/2023]
Abstract
Hypochlorous acid (HOCl) is a potent oxidant produced by myeloperoxidase that causes aggregation of many proteins. Treatment of apohaemoglobin and apomyoglobin with HOCl produced a regular series of oligomer bands when the proteins were separated by SDS/PAGE under reducing conditions. Aggregation was detectable at a HOCl/protein molar ratio of 0.5:1 and was maximal at ratios of 10:1-20:1. Dimers formed within 1 min of adding HOCl, and further aggregation occurred over the next 30 min. No convincing evidence for covalent cross-linking was obtained by amino acid analysis, peptide analysis or electrospray ionization-MS of HOCl-modified apomyoglobin. The latter showed an increase in mass consistent with conversion of the two methionine residues into sulphoxides. A 5-fold excess of HOCl generated approximately three chloramines on the apomyoglobin. These underwent slow decay. Protein carbonyls were formed and were almost entirely located only on the polymer bands. Conversion of positively into negatively charged groups on the protein by succinylation caused preformed aggregates to dissociate. Treatment of apomyoglobin with taurine chloramine generated methionine sulphoxides but few protein carbonyls, and did not result in aggregation. We conclude that aggregation was due to strong, non-covalent interactions between protein chains. We propose that formation of protein carbonyls and possibly chloramines, along with methionine oxidation, alters protein folding to expose hydrophobic areas on neighbouring molecules that associate to form dimers and higher-molecular-mass aggregates. This process could lead to the formation of aggregated proteins at sites of myeloperoxidase activity and contribute to inflammatory tissue injury.
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Affiliation(s)
- Anna L P Chapman
- Free Radical Research Group, Department of Pathology, Christchurch School of Medicine and Health Sciences, P.O. Box 4345, Christchurch, New Zealand
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43
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Kitagawa RR, Raddi MSG, Khalil NM, Vilegas W, da Fonseca LM. Effect of the isocoumarin paepalantine on the luminol and lucigenin amplified chemiluminescence of rat neutrophils. Biol Pharm Bull 2003; 26:905-8. [PMID: 12808312 DOI: 10.1248/bpb.26.905] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Paepalantine (9,10-dihydroxy-5,7-dimethoxy-1H-naphto(2,3c)pyran-1-one), a natural isocoumarin isolated from the capitula of Paepalanthus bromelioides (Eriocaulaceae), was assessed for its effect on the respiratory burst (zymosan-stimulated luminol-enhanced chemiluminescence and PMA-stimulated lucigenin-enhanced chemiluminescence) of polymorphonuclear neutrophils in vitro. Special attention was devoted to establishing the IC(50) for neutrophils. Paepalantine was able to decrease luminol and lucigenin chemiluminescence, reflecting an inhibitory effect on the respiratory burst, with an ED(50) of 0.44+/-0.05 and 0.84+/-0.15 microg/ml, respectively. A cell-free system was performed with paepalantine on myeloperoxidase/H(2)O(2) and myeloperoxidase/H(2)O(2)/Cl(-) systems. Paepalantine inhibited luminol oxidation in both systems. This inhibition was related to the interaction of paepalantine-myeloperoxidase and its scavenger effect on HOCl.
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Affiliation(s)
- Rodrigo Rezende Kitagawa
- Instituto de Química de Araraquara, Universidade Estadual Paulista Júlio de Mesquita Filho, Rua Prof. Francisco Degni, s/n, CP 355, 14801-970 Araraquara, SP, Brazil
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Pussinen PJ, Metso J, Keva R, Hirschmugl B, Sattler W, Jauhiainen M, Malle E. Plasma phospholipid transfer protein-mediated reactions are impaired by hypochlorite-modification of high density lipoprotein. Int J Biochem Cell Biol 2003; 35:192-202. [PMID: 12479869 DOI: 10.1016/s1357-2725(02)00130-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The two main functions of phospholipid transfer protein (PLTP) are the transfer of phospholipids between plasma lipoproteins and the conversion of high density lipoprotein (HDL), where prebeta-HDL particles are generated. HDL is considered an anti-atherogenic lipoprotein due to its function in the reverse cholesterol transport, where prebeta-HDL accepts cellular membrane cholesterol from peripheral tissues. However, the anti-atherogenic properties of native HDL may be abolished by oxidation/modification. Hypochlorous acid/hypochlorite (HOCl/OCl-)-a potent oxidant generated in vivo only by the myeloperoxidase-H2O2-chloride system of activated phagocytes-alters the physiological properties of HDL by generating a pro-atherogenic lipoprotein particle. Therefore, we have studied the effect of HOCl on the function of HDL subclass 3 (HDL3) and triglyceride-enriched HDL3 (TG-HDL3) in PLTP-mediated processes in vitro. Modification of HDL3 and TG-HDL3 with increasing HOCl concentrations (oxidant:lipoprotein molar ratio between 25:1 and 200:1) decreased the capacity of the corresponding lipoprotein particles to accept phospholipids. Although binding of PLTP to unmodified and HOCl-modified lipoprotein particles was similar, the degree of PLTP-mediated HDL conversion was decreased upon HOCl oxidation. PLTP released apolipoprotein A-I (apoA-I) from HOCl-modified HDL3, but the particles formed displayed no prebeta-mobility. Based on these findings, we conclude that the substrate properties of HOCl-modified HDL3 and TG-HDL3 in PLTP-mediated processes are impaired, which indicates that the anti-atherogenic properties of HDL are impaired.
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Affiliation(s)
- Pirkko J Pussinen
- Institute of Dentistry, University of Helsinki, P.O. Box 63, FIN-00014, Helsinki, Finland.
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Powers JC, Asgian JL, Ekici OD, James KE. Irreversible inhibitors of serine, cysteine, and threonine proteases. Chem Rev 2002; 102:4639-750. [PMID: 12475205 DOI: 10.1021/cr010182v] [Citation(s) in RCA: 816] [Impact Index Per Article: 37.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- James C Powers
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, USA.
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Carr AC, Frei B. Human neutrophils oxidize low-density lipoprotein by a hypochlorous acid-dependent mechanism: the role of vitamin C. Biol Chem 2002; 383:627-36. [PMID: 12033452 DOI: 10.1515/bc.2002.065] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Oxidatively modified low-density lipoprotein (LDL) has been strongly implicated in the pathogenesis of atherosclerosis. Peripheral blood leukocytes, such as neutrophils, can oxidize LDL by processes requiring superoxide and redox-active transition metal ions; however, it is uncertain whether such catalytic metal ions are available in the artery wall. Stimulated leukocytes also produce the reactive oxidant hypochlorous acid (HOCl) via the heme enzyme myeloperoxidase. Since myeloperoxidase-derived HOCl may be a physiologically relevant oxidant in atherogenesis, we investigated the mechanisms of neutrophil-mediated LDL modification and its possible prevention by the antioxidant ascorbate (vitamin C). As a sensitive marker of LDL oxidation, we measured LDL thiol groups. Stimulated human neutrophils (5x10(6) cells/ml) incubated with human LDL (0.25 mg protein/ml) time-dependently oxidized LDL thiols (33% and 79% oxidized after 10 and 30 min, respectively). Supernatants from stimulated neutrophils also oxidized LDL thiols (33% oxidized after 30 min), implicating long-lived oxidants such as N-chloramines. Experiments using specific enzyme inhibitors and oxidant scavengers showed that HOCl, but not hydrogen peroxide nor superoxide, plays a critical role in LDL thiol oxidation by neutrophils. Ascorbate (200 microM) protected against neutrophil-mediated LDL thiol oxidation for up to 15 min of incubation, after which LDL thiols became rapidly oxidized. Although stimulated neutrophils accumulated ascorbate during oxidation of LDL, pre-loading of neutrophils with ascorbate did not attenuate oxidant production by the cells. Thus, activated neutrophils oxidize LDL thiols by HOCl- and N-chloramine-dependent mechanisms and physiological concentrations of vitamin C delay this process, most likely due to scavenging of extracellular oxidants, rather than by attenuating neutrophil oxidant production.
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Affiliation(s)
- Anitra C Carr
- Linus Pauling Institute, Oregon State University, Corvallis 97331-6512, USA
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Hoy A, Leininger-Muller B, Kutter D, Siest G, Visvikis S. Growing significance of myeloperoxidase in non-infectious diseases. Clin Chem Lab Med 2002; 40:2-8. [PMID: 11916266 DOI: 10.1515/cclm.2002.002] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Myeloperoxidase (MPO) is a glycoprotein released by activated polymorphonuclear neutrophils, which takes part in the defense of the organism through production of hypochlorous acid (HOCl), a potent oxidant. Since the discovery of MPO deficiency, initially regarded as rare and restricted to patients suffering from severe infections, MPO has attracted clinical attention. The development of new technologies allowing screening for this defect has permitted new advances in the comprehension of underlying mechanisms. Apart from its implications for host defense, the expression of MPO restricted to myeloid precursors makes MPO mRNA a good marker of acute myeloid leukemia. In addition, during the last few years, involvement of MPO has been described in numerous diseases such as atherosclerosis, lung cancer, Alzheimer's disease and multiple sclerosis. Both strong oxidative activity and MPO genetic polymorphism have been involved. This review summarizes the broad range of diseases involving MPO and points out the possible use of this protein as a new clinical marker and a future therapeutic target.
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Affiliation(s)
- Aline Hoy
- INSERM Unité 525 Faculté de Pharmacie, Nancy, France
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48
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Egger T, Hammer A, Wintersperger A, Goti D, Malle E, Sattler W. Modulation of microglial superoxide production by alpha-tocopherol in vitro: attenuation of p67(phox) translocation by a protein phosphatase-dependent pathway. J Neurochem 2001; 79:1169-82. [PMID: 11752058 DOI: 10.1046/j.1471-4159.2001.00641.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
As in other phagocytic cells, the NADPH-oxidase system in microglia is thought to be primarily responsible for the production of superoxide anion radicals (O2(-.), a potentially cytotoxic reactive oxygen species. The assembly of a functional NADPH-oxidase complex at the plasma membrane depends on the phosphorylation and subsequent translocation of several cytosolic subunits. Immunocytochemical and subcellular fractionation experiments performed during the present study revealed that the NADPH-oxidase subunit p67(phox) translocates from the cytosol to the plasma membrane upon stimulation. Pre-incubation of microglia in alpha-tocopherol (alphaTocH) containing medium decreased O2(-.) production in a time- and concentration-dependent manner, findings attributed to attenuated p67(phox) translocation to the plasma membrane. Moreover, alphaTocH-supplementation of the culture medium resulted in decreased microglial protein kinase C (PKC) activities, an effect that could be partially or completely reversed by the addition of protein phosphatase inhibitors (okadaic acid and calyculin A). The addition of the PKC-inhibitor staurosporine inhibited the microglial respiratory burst in a manner comparable to alphaTocH. The addition of okadaic acid or calyculin A completely restored O2(-.) production in alphaTocH-supplemented cells. The present findings suggest that alphaTocH inactivates PKC via a PP1 or PP2A-mediated pathway and, as a consequence, blocks the phosphorylation-dependent translocation of p67(phox) to the plasma membrane. As a result, O2(-.) production by the microglial NADPH-oxidase system is substantially inhibited.
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Affiliation(s)
- T Egger
- Institute of Medical Biochemistry and Molecular Biology, Karl Franzens University Graz, Graz, Austria
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