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Chatterjee B, Fatima F, Seth S, Sinha Roy S. Moderate Elevation of Homocysteine Induces Endothelial Dysfunction through Adaptive UPR Activation and Metabolic Rewiring. Cells 2024; 13:214. [PMID: 38334606 PMCID: PMC10854856 DOI: 10.3390/cells13030214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Accepted: 11/25/2023] [Indexed: 02/10/2024] Open
Abstract
Elevation of the intermediate amino acid metabolite Homocysteine (Hcy) causes Hyperhomocysteinemia (HHcy), a metabolic disorder frequently associated with mutations in the methionine-cysteine metabolic cycle as well as with nutritional deficiency and aging. The previous literature suggests that HHcy is a strong risk factor for cardiovascular diseases. Severe HHcy is well-established to correlate with vascular pathologies primarily via endothelial cell death. Though moderate HHcy is more prevalent and associated with an increased risk of cardiovascular abnormalities in later part of life, its precise role in endothelial physiology is largely unknown. In this study, we report that moderate elevation of Hcy causes endothelial dysfunction through impairment of their migration and proliferation. We established that unlike severe elevation of Hcy, moderate HHcy is not associated with suppression of endothelial VEGF/VEGFR transcripts and ROS induction. We further showed that moderate HHcy induces a sub-lethal ER stress that causes defective endothelial migration through abnormal actin cytoskeletal remodeling. We also found that sub-lethal increase in Hcy causes endothelial proliferation defect by suppressing mitochondrial respiration and concomitantly increases glycolysis to compensate the consequential ATP loss and maintain overall energy homeostasis. Finally, analyzing a previously published microarray dataset, we confirmed that these hallmarks of moderate HHcy are conserved in adult endothelial cells as well. Thus, we identified adaptive UPR and metabolic rewiring as two key mechanistic signatures in moderate HHcy-associated endothelial dysfunction. As HHcy is clinically associated with enhanced vascular inflammation and hypercoagulability, identifying these mechanistic pathways may serve as future targets to regulate endothelial function and health.
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Affiliation(s)
- Barun Chatterjee
- CSIR-Institute of Genomics & Integrative Biology, New Delhi 110025, India; (B.C.); (F.F.); (S.S.)
- Academy of Scientific & Innovative Research, Ghaziabad 201002, India
| | - Fabeha Fatima
- CSIR-Institute of Genomics & Integrative Biology, New Delhi 110025, India; (B.C.); (F.F.); (S.S.)
| | - Surabhi Seth
- CSIR-Institute of Genomics & Integrative Biology, New Delhi 110025, India; (B.C.); (F.F.); (S.S.)
- Academy of Scientific & Innovative Research, Ghaziabad 201002, India
| | - Soumya Sinha Roy
- CSIR-Institute of Genomics & Integrative Biology, New Delhi 110025, India; (B.C.); (F.F.); (S.S.)
- Academy of Scientific & Innovative Research, Ghaziabad 201002, India
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2
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Jalal IA, Elkhoely A, Mohamed SK, Ahmed AAE. Linagliptin and secoisolariciresinol diglucoside attenuate hyperlipidemia and cardiac hypertrophy induced by a high-methionine diet in rats via suppression of hyperhomocysteinemia-induced endoplasmic reticulum stress. Front Pharmacol 2023; 14:1275730. [PMID: 38026992 PMCID: PMC10665493 DOI: 10.3389/fphar.2023.1275730] [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: 08/10/2023] [Accepted: 10/16/2023] [Indexed: 12/01/2023] Open
Abstract
Background: Cardiac hypertrophy (CH) is one of the contributing causes of morbidity and mortality. Hyperhomocysteinemia (HHcy) is one of the diseases which may predispose hyperlipidemia and CH. Linagliptin (Lina) and secoisolariciresinol diglucoside (SDG) are known to alleviate a variety of illnesses by reducing oxidative stress and inflammation. Aim: This study aimed to study the effect of HHcy on cardiac tissues, with a special focus on endoplasmic reticulum (ER) stress as a mainstay pathophysiological pathway. In addition, our study examined the protective effect of Lina, SDG, and their combination against HHcy-induced hyperlipidemia and CH in rats. Methods: Seventy-five male Sprague-Dawley rats were randomly divided into five groups, and for 60 days, the following regimen was administered: Group I: rats received distilled water; Group II: rats received methionine (MET) (2 g/kg/day, p.o.); groups III and IV: rats received Lina (3 mg/kg/day, p.o.) and SDG (20 mg/kg/day, p.o.), respectively, followed by MET (2 g/kg/day, p.o.); Group V: rats received Lina and SDG, followed by MET (2 g/kg/day, p.o.). Results: Pretreatment with Lina, SDG, and their combination showed a significant decrease in serum levels of HHcy and an improved lipid profile compared to the MET group. Moreover, both drugs improved cardiac injury, as evidenced by the substantial improvement in ECG parameters, morphological features of the cardiac muscle, and reduced serum levels of cardiac markers. Additionally, Lina and SDG significantly attenuated cardiac oxidative stress, inflammation, and apoptosis. Furthermore, Lina, SDG, and their combination remarkably downregulated the enhanced expression of endoplasmic reticulum (ER) stress markers, GRP78, PERK, ATF-4, CHOP, NF-κB, and SREBP1c compared to the MET-group. Conclusion: Lina and SDG showed cardioprotective effects against HHcy-induced heart hypertrophy and hyperlipidemia in rats.
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3
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Gao Z, Sun H, Xie Y, Ren Y. Assessment of the excretion of oxidative stress biomarkers and anabolic steroids based on sewage: A case study of college students and the general population. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 878:163079. [PMID: 36990235 DOI: 10.1016/j.scitotenv.2023.163079] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 03/20/2023] [Accepted: 03/22/2023] [Indexed: 05/13/2023]
Abstract
The use of wastewater-based epidemiology to evaluate the health and lifestyle of the population is a novel research interest. However, studies concerning the excretion of endogenous metabolites due to oxidative stress and the consumption of anabolic steroids have rarely been involved. In this study, we compared the effects of events such as final examination and sports meeting on the levels of four oxidative stress biomarkers (8-isoPGF2α, HNE-MA, 8-OHdG, and HCY) and four prohibited anabolic steroids (Testosterone, Androstenedione, Boldenone, and Metandienone) in sewage, using university students and urban populations as studying target. It was found that the per capita mass load of the four oxidative stress biomarkers 8-isoPGF2α, HNE-MA, 8-OHdG, and HCY in the sewage of Guangzhou urban area and university town were 256.6 ± 76.1, 9.4 ± 3.8, 1.1 ± 0.5, and 0.9 ± 0.4 mg/d/1000, respectively. The mean mass load of 8-isoPGF2α was significantly higher than that before the COVID-19 pandemic (74.9 ± 29.6 mg/d/1000 people, P < 0.05). The per capita load levels of oxidative stress biomarkers were significantly higher (P < 0.05) during the 2022 exam week relative to the pre-exam period, indicating that the exams caused transient stress to students. The per capita mass load of androgenic steroids was 77.7 mg/d/1000 people. There was an increase in the per capita load level of androgenic steroids during the provincial sports meeting. In this study, we quantified the concentration of oxidative stress biomarkers and androgenic steroids in the sewage and better realized the application of WBE on the health level and lifestyle of the population during special events.
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Affiliation(s)
- Zhihan Gao
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Hui Sun
- School of Physical Education, South China University of Technology, Guangzhou 510006, PR China
| | - Yufei Xie
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China
| | - Yuan Ren
- School of Environment and Energy, South China University of Technology, Guangzhou 510006, PR China; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, PR China; The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institution, PR China.
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4
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Warrier M, Paules EM, Silva-Gomez J, Friday WB, Bramlett F, Kim H, Zhang K, Trujillo-Gonzalez I. Homocysteine-induced endoplasmic reticulum stress activates FGF21 and is associated with browning and atrophy of white adipose tissue in Bhmt knockout mice. Heliyon 2023; 9:e13216. [PMID: 36755585 PMCID: PMC9900266 DOI: 10.1016/j.heliyon.2023.e13216] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 01/13/2023] [Accepted: 01/20/2023] [Indexed: 01/30/2023] Open
Abstract
Betaine-homocysteine methyltransferase (BHMT) catalyzes the transfer of methyl groups from betaine to homocysteine (Hcy), producing methionine and dimethylglycine. In this work, we characterize Bhmt wild type (Bhmt-WT) and knockout (Bhmt-KO) mice that were fully backcrossed to a C57Bl6/J background. Consistent with our previous findings, Bhmt-KO mice had decreased body weight, fat mass, and adipose tissue weight compared to WT. Histological analyses and gene expression profiling indicate that adipose browning was activated in KO mice and contributed to the adipose atrophy observed. BHMT is not expressed in adipose tissue but is abundant in liver; thus, a signal must originate from the liver that modulates adipose tissue. We found that, in Bhmt-KO mice, homocysteine-induced endoplasmic reticulum (ER) stress is associated with activation of the hepatic transcription factor cyclic AMP response element binding protein (CREBH), and an increase in hepatic and plasma concentrations of fibroblast growth factor 21 (FGF21), which is known to induce adipose browning. Our data indicate that the deletion of a single gene in one-carbon metabolism modifies adipose biology and energy metabolism. Future studies could focus on identifying if functional polymorphisms in BHMT result in a similar adipose atrophy phenotype.
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Affiliation(s)
- Manya Warrier
- Department of Nutrition, UNC Nutrition Research Institute, UNC-Chapel Hill, Kannapolis, NC, USA
| | - Evan M Paules
- Department of Nutrition, UNC Nutrition Research Institute, UNC-Chapel Hill, Kannapolis, NC, USA.,Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27514, USA
| | - Jorge Silva-Gomez
- Department of Nutrition, UNC Nutrition Research Institute, UNC-Chapel Hill, Kannapolis, NC, USA
| | - Walter B Friday
- Department of Nutrition, UNC Nutrition Research Institute, UNC-Chapel Hill, Kannapolis, NC, USA
| | - Frances Bramlett
- Department of Nutrition, UNC Nutrition Research Institute, UNC-Chapel Hill, Kannapolis, NC, USA
| | - Hyunbae Kim
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI, USA
| | - Kezhong Zhang
- Center for Molecular Medicine and Genetics, Wayne State University School of Medicine, Detroit, MI, USA
| | - Isis Trujillo-Gonzalez
- Department of Nutrition, UNC Nutrition Research Institute, UNC-Chapel Hill, Kannapolis, NC, USA.,Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27514, USA
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Xie W, Karpeta N, Tong B, Liu Y, Zhang Z, Duan M. Comorbidities and laboratory changes of sudden sensorineural hearing loss: a review. Front Neurol 2023; 14:1142459. [PMID: 37144001 PMCID: PMC10151530 DOI: 10.3389/fneur.2023.1142459] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 03/29/2023] [Indexed: 05/06/2023] Open
Abstract
Sudden sensorineural hearing loss (SSNHL) is defined as an abrupt hearing loss of more than 30 dB in three contiguous frequencies within 72 h. It is an emergency disease requiring immediate diagnosis and treatment. The incidence of SSNHL in Western countries' population is estimated between 5 and 20 per 1,00,000 inhabitants. The etiology of SSNHL remains unknown. Due to the uncertainty of the cause of SSNHL, at present, no specific treatment targets the cause of SSNHL, resulting in poor efficacy. Previous studies have reported that some comorbidities are risk factors for SSNHL, and some laboratory results may provide some clues for the etiology of SSNHL. Atherosclerosis, microthrombosis, inflammation, and the immune system may be the main etiological factors for SSNHL. This study confirms that SSNHL is a multifactorial disease. Some comorbidities, such as virus infections, are suggested to be the causes of SSNHL. In summary, by analyzing the etiology of SSNHL, more targeting treatments should be used to achieve a better effect.
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Affiliation(s)
- Wen Xie
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Niki Karpeta
- Division of Ear, Nose and Throat Diseases, Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
- Department of Otolaryngology-Head and Neck Surgery, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
| | - Busheng Tong
- Department of Otolaryngology, Head and Neck Surgery, The First Affiliated Hospital of Anhui Medical University, Anhui, Hefei, China
| | - Yuehui Liu
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Zhilin Zhang
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang, China
| | - Maoli Duan
- Division of Ear, Nose and Throat Diseases, Department of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
- Department of Otolaryngology-Head and Neck Surgery, Karolinska University Hospital, Karolinska Institutet, Stockholm, Sweden
- *Correspondence: Maoli Duan
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Mutual effect of homocysteine and uric acid on arterial stiffness and cardiovascular risk in the context of predictive, preventive, and personalized medicine. EPMA J 2022; 13:581-595. [PMID: 36505895 PMCID: PMC9727018 DOI: 10.1007/s13167-022-00298-x] [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: 07/14/2022] [Accepted: 08/26/2022] [Indexed: 12/15/2022]
Abstract
Background Arterial stiffness is a major risk factor and effective predictor of cardiovascular diseases and a common pathway of pathological vascular impairments. Homocysteine (Hcy) and uric acid (UA) own the shared metabolic pathways to affect vascular function. Serum uric acid (UA) has a great impact on arterial stiffness and cardiovascular risk, while the mutual effect with Hcy remains unknown yet. This study aimed to evaluate the mutual effect of serum Hcy and UA on arterial stiffness and 10-year cardiovascular risk in the general population. From the perspective of predictive, preventive, and personalized medicine (PPPM/3PM), we assumed that combined assessment of Hcy and UA provides a better tool for targeted prevention and personalized intervention of cardiovascular diseases via suppressing arterial stiffness. Methods This study consisted of 17,697 participants from Beijing Health Management Cohort, who underwent health examination between January 2012 and December 2019. Brachial-ankle pulse wave velocity (baPWV) was used as an index of arterial stiffness. Results Individuals with both high Hcy and UA had the highest baPWV, compared with those with low Hcy and low UA (β: 30.76, 95% CI: 18.36-43.16 in males; β: 53.53, 95% CI: 38.46-68.60 in females). In addition, these individuals owned the highest 10-year cardiovascular risk (OR: 1.49, 95% CI: 1.26-1.76 in males; OR: 7.61, 95% CI: 4.63-12.68 in females). Of note, males with high homocysteine and low uric acid were significantly associated with increased cardiovascular risk (OR: 1.30, 95% CI: 1.15-1.47), but not the high uric acid and low homocysteine group (OR: 1.02, 95% CI: 0.90-1.16). Conclusions This study found the significantly mutual effect of Hcy and UA on arterial stiffness and cardiovascular risk using a large population and suggested the clinical importance of combined evaluation and control of Hcy and UA for promoting cardiovascular health. The adverse effect of homocysteine on arteriosclerosis should be addressed beyond uric acid, especially for males. Monitoring of the level of both Hcy and UA provides a window opportunity for PPPM/3PM in the progression of arterial stiffness and prevention of CVD. Hcy provides a novel predictor beyond UA of cardiovascular health to identify individuals at high risk of arterial stiffness for the primary prevention and early treatment of CVD. In the progressive stage of arterial stiffness, active control of Hcy and UA levels from the aspects of dietary behavior and medication treatment is conducive to alleviating the level of arterial stiffness and reducing the risk of CVD. Further studies are needed to evaluate the clinical effect of Hcy and UA targeted intervention on arterial stiffness and cardiovascular health. Supplementary Information The online version contains supplementary material available at 10.1007/s13167-022-00298-x.
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Wang S, Wei Y, Hidru TH, Li D, Wang N, Yang Y, Wang Y, Yang X, Xia Y. Combined Effect of Homocysteine and Uric Acid to Identify Patients With High Risk for Subclinical Atrial Fibrillation. J Am Heart Assoc 2021; 11:e021997. [PMID: 34971315 PMCID: PMC9075184 DOI: 10.1161/jaha.121.021997] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Background Subclinical atrial fibrillation (SCAF) is often asymptomatic nonetheless harmful. In patients with cardiac implantable electronic devices, we evaluated the combined performance of homocysteine and uric acid (UA) biomarkers to discriminate high‐risk patients for SCAF. Methods and Results We enrolled 1224 consecutive patients for evaluation of SCAF in patients with cardiac implantable electronic devices in Dalian, China, between January 2013 and December 2019. Clinical data and blood samples were obtained from patients selected according to the absence or presence of atrial high‐rate episodes >6 minutes. Blood samples were obtained, and homocysteine and UA biomarkers were tested in all patients to distinguish their prognostic performance for SCAF. Homocysteine and UA biomarkers were significantly different in SCAF versus no SCAF. On multivariable Cox regression analysis with potential confounders, elevated homocysteine and UA biomarkers were significantly associated with an increased risk of SCAF. A rise of 1 SD in homocysteine (5.7 μmol/L) was associated with an increased risk of SCAF in men and women regardless of their UA levels. Similarly, a 1‐SD increase in UA (91 μmol/L) was associated with an increased risk of SCAF among the patients with high levels of homocysteine in men (hazard ratio, 1.81; 95% CI, 1.43–2.30) and women (hazard ratio, 2.11; 95% CI, 1.69–2.62). The addition of homocysteine and UA to the atrial fibrillation risk factors recommended by the 2020 European Society of Cardiology Guidelines significantly improved risk discrimination for SCAF. Conclusions Homocysteine and UA biomarkers were strongly associated with SCAF. The prediction performance of the European Society of Cardiology model for SCAF was increased by the addition of the selected biomarkers. Registration URL: https://www.chictr.org.cn; Unique identifier: Chi‐CTR200003837.
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Affiliation(s)
- Shihao Wang
- Department of Cardiology Institute of Cardiovascular Diseases First Affiliated Hospital of Dalian Medical University Dalian Liaoning China
| | - Yushan Wei
- Department of Cardiology Institute of Cardiovascular Diseases First Affiliated Hospital of Dalian Medical University Dalian Liaoning China
| | - Tesfaldet Habtemariam Hidru
- Department of Cardiology Institute of Cardiovascular Diseases First Affiliated Hospital of Dalian Medical University Dalian Liaoning China
| | - Daobo Li
- Department of Cardiology Institute of Cardiovascular Diseases First Affiliated Hospital of Dalian Medical University Dalian Liaoning China
| | - Nan Wang
- Department of Cardiology Institute of Cardiovascular Diseases First Affiliated Hospital of Dalian Medical University Dalian Liaoning China
| | - Yiheng Yang
- Department of Cardiology Institute of Cardiovascular Diseases First Affiliated Hospital of Dalian Medical University Dalian Liaoning China
| | - Yunsong Wang
- Department of Cardiology Institute of Cardiovascular Diseases First Affiliated Hospital of Dalian Medical University Dalian Liaoning China
| | - Xiaolei Yang
- Department of Cardiology Institute of Cardiovascular Diseases First Affiliated Hospital of Dalian Medical University Dalian Liaoning China
| | - Yunlong Xia
- Department of Cardiology Institute of Cardiovascular Diseases First Affiliated Hospital of Dalian Medical University Dalian Liaoning China
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Saberi-Karimian M, Norouzy A. The Association between Glycemic Control with Oxidant Status Parameters in Type 2 Diabetic Patients. ACTA BIO-MEDICA : ATENEI PARMENSIS 2021; 92:e2021100. [PMID: 34212935 PMCID: PMC8343742 DOI: 10.23750/abm.v92i3.9505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 04/09/2020] [Indexed: 11/29/2022]
Abstract
PURPOSE Glycemic control is important in order to avoid LDLs increased susceptibility to oxidation in diabetic patients. This study assess the relationship between diabetes control with serum prooxidant-antioxidant balance (PAB), oxidized LDL cholesterol (oxLDLc), homocysteine and vitamin D levels in patients with type 2 diabetes. MATERIAL AND METHODS This was a cross-sectional study on three groups including 80 subjects as well (WGC) and poor (PGC) glycemic control and 40 healthy subjects. Presence of nephropathy and retinopathy were determined using IDF criteria. HbA1c level was determined with columnar chromatography using BioSystems kit. Serum PAB, homocysteine, oxLDLc and vitamin D levels were measured by the standard tests. RESULTS There was a significant association between PAB with PGC (P< 0.001), diabetic retinopathy (P< 0.01) and nephropathy (P< 0.01) in type 2 diabetic patients. Moreover, the results showed that vitamin D serum levels was significantly lower in PGC patients (P< 0.01), and diabetic patients with retinopathy (P< 0.01). Multiple linear regression analysis revealed that the vitamin D deficiency can predict the HbA1c variations by 77.7% (β=- 0.775) in subjects with type 2 diabetes mellitus (P<0.001). CONCLUSIONS There was a significant association between prooxidant-antioxidant balance and vitamin D serum levels with diabetic complications.
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Affiliation(s)
- Maryam Saberi-Karimian
- Vascular and Endovascular Surgery Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
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9
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Toninello P, Montanari A, Bassetto F, Vindigni V, Paoli A. Nutritional Support for Bariatric Surgery Patients: The Skin beyond the Fat. Nutrients 2021; 13:1565. [PMID: 34066564 PMCID: PMC8148584 DOI: 10.3390/nu13051565] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 04/28/2021] [Accepted: 05/03/2021] [Indexed: 12/20/2022] Open
Abstract
Body contouring surgery after the massive weight loss due to bariatric surgery deals with different kinds of complications. The aim of this review is to analyze the role that some nutrients may play in tissue healing after surgery, thus helping plastic surgeons to improve the aesthetic and health outcomes in massive weight loss patients under a multidisciplinary approach. As a matter of fact, preoperative nutritional deficiencies have been shown for vitamins and minerals in a large percentage of post-bariatric patients. Preoperative deficiencies mainly concern iron, zinc, selenium, and vitamins (both fat-soluble and water-soluble), but also total protein. During the postoperative period, these problems may increase because of the patients' very low intake of vitamins and minerals after bariatric surgery (below 50% of the recommended dietary allowance) and the patients' low compliance with the suggested multivitamin supplementation (approximately 60%). In the postoperative period, more attention should be given to nutritional aspects in regard to the length of absorptive area and the percentage of weight loss.
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Affiliation(s)
- Paolo Toninello
- Plastic and Reconstructive Surgery Unit, Department of Neurosciences, University of Padua, 35122 Padua, Italy; (P.T.); (A.M.); (F.B.); (V.V.)
| | - Alvise Montanari
- Plastic and Reconstructive Surgery Unit, Department of Neurosciences, University of Padua, 35122 Padua, Italy; (P.T.); (A.M.); (F.B.); (V.V.)
| | - Franco Bassetto
- Plastic and Reconstructive Surgery Unit, Department of Neurosciences, University of Padua, 35122 Padua, Italy; (P.T.); (A.M.); (F.B.); (V.V.)
| | - Vincenzo Vindigni
- Plastic and Reconstructive Surgery Unit, Department of Neurosciences, University of Padua, 35122 Padua, Italy; (P.T.); (A.M.); (F.B.); (V.V.)
| | - Antonio Paoli
- Department of Biomedical Sciences, University of Padova, 35122 Padua, Italy
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Balani P, Lopez AR, Nobleza CMN, Siddiqui M, Shah PV, Khan S. Can Pioglitazone Safeguard Patients of Lichen Planus Against Homocysteine Induced Accelerated Cardiovascular Aging and Reduced Myocardial Performance: A Systematic Review. Cureus 2020; 12:e12372. [PMID: 33527053 PMCID: PMC7842239 DOI: 10.7759/cureus.12372] [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] [Indexed: 11/05/2022] Open
Abstract
Lichen planus (L.P.) is a long-standing mucocutaneous inflammatory condition. A less familiar but essential illness association is increased arterial stiffness, endothelial dysfunction, and advanced atherosclerosis. Enhanced cardiac reconditioning and reduced performance of the heart have been suggested. Thiazolidinediones were commenced to manage hyperglycemia in diabetes mellitus. Recently, the class attained popularity after its action on vascular physiology was discovered. With this review, we attempted to explore whether an antidiabetic drug, pioglitazone (PIO), a peroxisome proliferator‑activated receptor γ (PPAR gamma) agonist, can defend patients of lichen planus against increased arterial stiffness and cardiac changes. We methodically screened numerous databases using focused words and phrases for relevant articles. After a comprehensive exploration, we applied the inclusion and exclusion criteria and performed a quality appraisal. Items retained were exhaustively studied. High homocysteine (HHcy) levels in lichen planus play a significant role in modifying the arteries and leading to their dysfunction. Not only does homocysteine affect the precursor cells, but it also increases the free radical damage. Arterial damage and upraised resistance encountered by the heart reduce its performance. After an exhaustive analysis, in our opinion, pioglitazone works in various miscellaneous ways to mitigate the homocysteine mediated changes. Early inclusion of the drug in managing patients with lichen planus seems promising in minimizing the harmful effects of high homocysteine. Evaluating the risk-benefit ratio, we believe that a trial of pioglitazone could be given to patients without underlying cardiac conditions.
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Affiliation(s)
- Prachi Balani
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Angel R Lopez
- Psychiatry, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Chelsea Mae N Nobleza
- Neurology, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Mariah Siddiqui
- Neurology, St. George's University, True Blue, GRD.,Neurology, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Parth V Shah
- Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
| | - Safeera Khan
- Internal Medicine, California Institute of Behavioral Neurosciences & Psychology, Fairfield, USA
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11
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Burgess K, Bennett C, Mosnier H, Kwatra N, Bethel F, Jadavji NM. The Antioxidant Role of One-Carbon Metabolism on Stroke. Antioxidants (Basel) 2020; 9:E1141. [PMID: 33212887 PMCID: PMC7698340 DOI: 10.3390/antiox9111141] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2020] [Revised: 11/09/2020] [Accepted: 11/10/2020] [Indexed: 02/07/2023] Open
Abstract
One-carbon (1C) metabolism is a metabolic network that is centered on folate, a B vitamin; it integrates nutritional signals with biosynthesis, redox homeostasis, and epigenetics. This metabolic pathway also reduces levels of homocysteine, a non-protein amino acid. High levels of homocysteine are linked to increased risk of hypoxic events, such as stroke. Several preclinical studies have suggested that 1C metabolism can impact stroke outcome, but the clinical data are unclear. The objective of this paper was to review preclinical and clinical research to determine whether 1C metabolism has an antioxidant role on stroke. To accomplish the objective, we searched for publications using the following medical subject headings (MeSH) keywords: antioxidants, hypoxia, stroke, homocysteine, one-carbon metabolism, folate, methionine, and dietary supplementation of one-carbon metabolism. Both pre-clinical and clinical studies were retrieved and reviewed. Our review of the literature suggests that deficiencies in 1C play an important role in the onset and outcome of stroke. Dietary supplementation of 1C provides beneficial effects on stroke outcome. For stroke-affected patients or individuals at high risk for stroke, the data suggest that nutritional modifications in addition to other therapies could be incorporated into a treatment plan.
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Affiliation(s)
- Kassidy Burgess
- College of Veterinary Medicine, Midwestern University, Glendale, AZ 85308, USA;
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
| | - Calli Bennett
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
- College of Osteopathic Medicine, Midwestern University, Glendale, AZ 85308, USA
| | - Hannah Mosnier
- School of Medicine, National University of Ireland Galway, H91 TK33, Ireland;
- College of Dental Medicine, Midwestern University, Glendale, AZ 85308, USA
| | - Neha Kwatra
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
- College of Dental Medicine, Midwestern University, Glendale, AZ 85308, USA
| | - Forrest Bethel
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
- College of Osteopathic Medicine, Midwestern University, Glendale, AZ 85308, USA
| | - Nafisa M. Jadavji
- College of Veterinary Medicine, Midwestern University, Glendale, AZ 85308, USA;
- Biomedical Sciences Program, Midwestern University, Glendale, AZ 85308, USA; (C.B.); (N.K.); (F.B.)
- Department of Neuroscience, Carleton University, Ottawa, ON K1S 5B6, Canada
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12
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Chang HL, Chen GR, Hsiao PJ, Chiu CC, Tai MC, Kao CC, Tsai DJ, Su H, Chen YH, Chen WT, Su SL. Decisive evidence corroborates a null relationship between MTHFR C677T and chronic kidney disease: A case-control study and a meta-analysis. Medicine (Baltimore) 2020; 99:e21045. [PMID: 32702845 PMCID: PMC7373545 DOI: 10.1097/md.0000000000021045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND Previous meta-analyses have explored the association between the C677T polymorphism of methyltetrahydrofolate reductase (MTHFR) and chronic kidney disease (CKD) but there were no studies with a decisive conclusion. Furthermore, the high heterogeneity among different populations is not yet interpreted. OBJECTIVES This study used trial sequential analysis (TSA) to evaluate whether the nowadays conclusion supported by current cumulative samples. We also applied case-weighted meta-regression to explore the potential gene-environment interactions. METHODS For the first stage of this study we conducted a case-control study involving 847 dialysis patients from 7 hemodialysis centers in Taipei during 2015 to 2018 and 755 normal controls from a health center in the Tri-Service General Hospital. The second stage combined the results from the first stage with previous studies. The previous studies were collected from PubMed, EMBASE, and Web of Science databases before January 2018. RESULTS From the case-control study, the T allele of MTHFR C677T appeared to have a protective effect on end-stage renal disease compared with the C allele [odds ratio (OR): 0.80, 95% CI (confidence interval) = 0.69-0.93]. However, the meta-analysis contradicted the results in Asian (OR = 1.12, 95% CI = 0.96-1.30). The same analysis was also applied in Caucasian and presented similar results from Asian (OR = 1.18, 95% CI = 0.98-1.42). The TSA showed our case-control study to be the decisive sample leading to a null association among Asian population. The high heterogeneity (I = 75%) could explain the contradictory results between the case-control study and the meta-analysis. However, further case-weighted meta-regression did not find any significant interaction between measured factors and MTHFR C677T on CKD. CONCLUSIONS High heterogeneities were found in both Caucasian and Asian, which caused the null relationship in meta-analysis while there were significant effects in individual studies. Future studies should further explore the high heterogeneity that might be hidden in unmeasured gene-environment interactions, to explain the diverse findings among different populations.
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Affiliation(s)
- Hsueh-Lu Chang
- School of Public Health
- School of Dentistry
- Center for General Education, National Defense Medical Center, Taipei
| | | | - Po-Jen Hsiao
- Department of Internal Medicine, Taoyuan Armed Forces General Hospital
| | - Chih-Chien Chiu
- Division of Infectious Diseases, Department of Internal Medicine, Taoyuan Armed Forces General Hospital, National Defense Medical Center, Taoyuan
| | - Ming-Cheng Tai
- Department of Ophthalmology, Tri-Service General Hospital, National Defense Medical Center, Taipei
| | - Chung-Cheng Kao
- Department of Emergency Medicine, Taoyuan Armed Forces General Hospital, National Defense Medical Center, Taoyuan
| | - Dung-Jang Tsai
- School of Public Health
- Graduate Institute of Life Sciences, National Defense Medical Center, Taipei
| | - Hao Su
- Department of Health Industry Management, Kainan University, Taoyuan
| | | | - Wei-Teing Chen
- Division of Thoracic Medicine, Department of Medicine, Cheng Hsin General Hospital
- Department of Medicine, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan, ROC
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13
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Li D, Zhao Q, Zhang C, Huang X, Godfrey O, Zhang W. Associations of MTRR A66G polymorphism and promoter methylation with ischemic stroke in patients with hyperhomocysteinemia. J Gene Med 2020; 22:e3170. [DOI: 10.1002/jgm.3170] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2019] [Revised: 01/12/2020] [Accepted: 02/04/2020] [Indexed: 12/29/2022] Open
Affiliation(s)
- Dankang Li
- Department of Epidemiology, School of Public HealthZhengzhou University Zhengzhou Henan China
| | - Qinglin Zhao
- Department of Epidemiology, School of Public HealthZhengzhou University Zhengzhou Henan China
| | - Chengda Zhang
- Department of International Medicine, Beaumont Health System Royal Oak MI USA
| | - Xiaowen Huang
- Department of Epidemiology, School of Public HealthZhengzhou University Zhengzhou Henan China
| | - Opolot Godfrey
- Department of Epidemiology, School of Public HealthZhengzhou University Zhengzhou Henan China
| | - Weidong Zhang
- Department of Epidemiology, School of Public HealthZhengzhou University Zhengzhou Henan China
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14
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Reddy VS, Trinath J, Reddy GB. Implication of homocysteine in protein quality control processes. Biochimie 2019; 165:19-31. [PMID: 31269461 DOI: 10.1016/j.biochi.2019.06.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 06/26/2019] [Indexed: 12/22/2022]
Abstract
Homocysteine (Hcy) is a key metabolite generated during methionine metabolism. The elevated levels of Hcy in the blood are reffered to as hyperhomocystenimeia (HHcy). The HHcy is caused by impaired metabolism/deficiency of either folate or B12 or defects in Hcy metabolism. Accumulating evidence suggests that HHcy is associated with cardiovascular and brain diseases including atherosclerosis, endothelial injury, and stroke etc. Vitamin B12 (cobalamin; B12) is a water-soluble vitamin essential for two metabolic reactions. It acts as a co-factor for methionine synthase and L-methylmalonyl-CoA mutase. Besides, it is also vital for DNA synthesis and maturation of RBC. Deficiency of B12 is associated with haematological and neurological disorders. Hyperhomocysteinemia (HHcy)-induced toxicity is thought to be mediated by the accumulation of Hcy and its metabolites, homocysteinylated proteins. Cellular protein quality control (PQC) is essential for the maintenance of proteome integrity, and cell viability and its failure contributes to the development of multiple diseases. Chaperones, unfolded protein response (UPR), ubiquitin-proteasome system (UPS), and autophagy are analogous strategies of PQC that maintain cellular proteome integrity. Recently, multiple studies reported that HHcy responsible for perturbation of PQC by reducing chaperone levels, activating UPR, and impairing autophagy. Besides, HHcy also induce cytotoxicity, inflammation, protein aggregation and apoptosis. It has been shown that some of the factors including altered SIRT1-HSF1 axis and irreversible homocysteinylation of proteins are responsible for folate and/or B12 deficiency or HHcy-induced impairment of PQC. Therefore, this review highlights the current understanding of HHcy in the context of cellular PQC and their pathophysiological and clinical consequences, epigenomic changes, therapeutic implications of B12, and chemical chaperones based on cell culture and experimental animal models.
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Affiliation(s)
- V Sudhakar Reddy
- Biochemistry Division, National Institute of Nutrition, Hyderabad, India.
| | - Jamma Trinath
- Department of Biological Sciences, BITS-Pilani, 500078, Hyderabad Campus, Hyderabad, Telangana, India
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15
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Lu J, Trabert B, Liao LM, Pfeiffer RM, Michels KA. Dietary intake of nutrients involved in folate-mediated one-carbon metabolism and risk for endometrial cancer. Int J Epidemiol 2019; 48:474-488. [PMID: 30544261 DOI: 10.1093/ije/dyy270] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/09/2018] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Studies disagree as to whether intakes of folate-mediated one-carbon metabolism nutrients are associated with endometrial cancer. METHODS Using data from the large, prospective NIH-AARP Diet and Health Study, we used Cox proportional hazards models to evaluate endometrial cancer risk associated with calorie-adjusted dietary intake of several B vitamins and methionine. All models accounted for age, race, body mass index (BMI), smoking, oral-contraceptive use, menopausal hormone therapy use and caloric intake. We estimated associations by time from baseline (≤3 or >3 years) and stratified models by BMI (<25 or ≥25 kg/m2). During 16 years of follow-up, we identified 2329 endometrial cancer cases among 114 414 participants. RESULTS After adjustment for confounding, we observed increased risk for endometrial cancer with greater consumption of dietary total folate, natural folate, B2, B6 and B12 [hazard ratios (HRs) ranging from 1.14 to 1.24 for the highest quintile (Q5) vs the lowest (Q1)]. Higher intakes of total folate, natural folate, B6 and B12 continued to be associated with increased risk when limiting follow-up to >3 years from baseline. We observed risks for the highest intakes of B2 [Q5 vs Q1: HR 1.27 95% confidence interval (CI) 1.07-1.50], B12 (Q5 vs Q1: HR 1.38 CI 1.17-1.63) and methionine (Q5 vs Q1: HR 1.26 CI 1.07-1.48) among women who were overweight/obese, but not among normal/underweight women. CONCLUSIONS Our findings indicate that one-carbon metabolism plays a role in endometrial carcinogenesis and exploration of this role in tissue and cellular biology studies is warranted.
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Affiliation(s)
- Jana Lu
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, MD, USA
| | - Britton Trabert
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, MD, USA
| | - Linda M Liao
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, MD, USA
| | - Ruth M Pfeiffer
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, MD, USA
| | - Kara A Michels
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Rockville, MD, USA
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16
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Azizi S, Shamshirian A, Alizadeh-Navaei R, Jafarpour H, Asemi Z, Tamtaji OR, Vaziri MS, Homayounfar R, Rezaei Shahmirzadi A, Alipoor R. A Genetic Association Study of MTHFR C677T Polymorphism with Risk of Metabolic Syndrome: A Systematic Review and Meta-Analysis. Galen Med J 2019; 8:e1472. [PMID: 34466514 PMCID: PMC8343661 DOI: 10.31661/gmj.v8i0.1472] [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: 12/30/2018] [Revised: 01/23/2019] [Accepted: 02/08/2019] [Indexed: 02/05/2023] Open
Abstract
Methylenetetrahydrofolate reductase (MTHFR) is an enzyme that plays a crucial role as a methyl-group donor in demethylation of homocysteine. The aim of this systematic review and meta-analysis was to study the relationship between MTHFR gene polymorphism and metabolic syndrome (MS). We used search engines and databases such as Science Direct, Google Scholar, Embase, Cochrane Library, and PubMed to identify eligible studies up to 2018. The articles were studied based on keywords including MTHFR, mutation, variant, and polymorphism in combination with MS. Data was analyzed using Comprehensive Meta-Analysis version 2.2.064 software. After extracting the data from seven articles, the total number of subjects was 1280 in the patient group and 1374 in the control group. The odds ratio was estimated to be 1.078 for the allele model of T vs. C (95% confidence interval [CI]: 1.626-0.715), 1.157 for the allele model of CC vs. CT (95% CI: 0.829-1.615), 1.020 for the allele model of CT + TT vs. CC (95% CI: 1.611-0.646) and 0.799 for the allele model of TT vs. CC + CT (95% CI: 1.185- 0.539). As well, the results showed no statistically significant correlation between polymorphism genotypes of the MTHFR gene and MS (P<0.05). In general, this study showed that the presence of C677T polymorphism in the MTHFR gene has no effect on the incidence of MS.
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Affiliation(s)
- Soheil Azizi
- Department of Laboratory Sciences, Faculty of Paramedicine, Mazandaran University of Medical Sciences, Sari, Iran
| | - Amir Shamshirian
- Student Research Committee, Mazandaran University of Medical Sciences, Sari, Iran
| | - Reza Alizadeh-Navaei
- Gastrointestinal Cancer Research Center, Mazandaran University of Medical Sciences, Sari, Iran
| | - Hamed Jafarpour
- Student Research Committee, Mazandaran University of Medical Sciences, Sari, Iran
| | - Zatollah Asemi
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Kashan University of Medical Sciences, Kashan, Iran
| | - Omid Reza Tamtaji
- Physiology Research Center, Kashan University of Medical Sciences, Kashan, Iran
| | - Mohammad Sadegh Vaziri
- Student Research Committee, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
| | - Reza Homayounfar
- Non-Communicable Disease Research Center, Fasa University of Medical Sciences, Fasa, Iran
| | | | - Reza Alipoor
- Student Research Committee, Hormozgan University of Medical Sciences, Bandar Abbas, Iran
- Non-Communicable Disease Research Center, Fasa University of Medical Sciences, Fasa, Iran
- Correspondence to: Reza Alipoor, Student Research Committee, Fasa University of Medical Sciences, Fasa, Iran Telephone Number: +989174462124 Email Address:
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17
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Hou HT, Wang J, Zhang X, Wang ZQ, Chen TN, Zhang JL, Yang Q, He GW. Endothelial nitric oxide synthase enhancer AVE3085 reverses endothelial dysfunction induced by homocysteine in human internal mammary arteries. Nitric Oxide 2018; 81:21-27. [PMID: 30300735 DOI: 10.1016/j.niox.2018.10.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 09/07/2018] [Accepted: 10/04/2018] [Indexed: 12/23/2022]
Abstract
Homocysteine (Hcy) is an independent risk factor for endothelial dysfunction in cardiovascular diseases. We hypothesized that the eNOS transcription enhancer AVE3085 may protect the endothelial function damaged by Hcy in the human internal mammary artery (IMA). Cumulative concentration-relaxation curves to acetylcholine (-10 to -4.5 log mol/L) or sodium nitroprusside were established in IMA from patients undergoing coronary artery surgery precontracted by U46619 (-8 log mol/L) in the absence/presence of Hcy (100 μmol/L) with/without AVE3085 (30 μmol/L) in vitro in a myograph. RT-qPCR and ELISA were used to quantify the mRNA and protein levels of eNOS. Colorimetric assay method was used to detect the production of nitric oxide (NO). Maximal relaxation was significantly attenuated by Hcy in human IMA. Co-incubation with AVE3085 protected endothelium from the impairment by Hcy and increased the production of NO. Exposure to Hcy for 24 h downregulated eNOS protein expression (P < 0.05) whereas it upregulated the expression of eNOS at mRNA levels (P < 0.05). The presence of AVE3085 in addition to Hcy significantly increased the eNOS protein (P < 0.05) and slightly decreased the mRNA level. The study for the first time revealed that in the human blood vessels (IMA) the clinically-relevant high concentration of Hcy directly causes endothelial dysfunction by downregulating eNOS protein that may be reversed by AVE3085. These findings not only provide new direction for protecting endothelium during coronary artery bypass grafting and improving long-term patency of the grafts, but also provide evidence to the use of eNOS enhancer in the patients with endothelial dysfunction in various pathological conditions.
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Affiliation(s)
- Hai-Tao Hou
- Department of Cardiovascular Surgery & Center for Basic Medical Research, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China; The Affiliated Hospital of Hangzhou Normal University& Zhejiang University, Hangzhou, China
| | - Jun Wang
- Department of Cardiovascular Surgery & Center for Basic Medical Research, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Xi Zhang
- Department of Cardiovascular Surgery & Center for Basic Medical Research, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Zheng-Qing Wang
- Department of Cardiovascular Surgery & Center for Basic Medical Research, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Tie-Nan Chen
- Department of Cardiovascular Surgery & Center for Basic Medical Research, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Jian-Liang Zhang
- Department of Cardiovascular Surgery & Center for Basic Medical Research, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Qin Yang
- Department of Cardiovascular Surgery & Center for Basic Medical Research, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China
| | - Guo-Wei He
- Department of Cardiovascular Surgery & Center for Basic Medical Research, TEDA International Cardiovascular Hospital, Chinese Academy of Medical Sciences, Tianjin, China; The Affiliated Hospital of Hangzhou Normal University& Zhejiang University, Hangzhou, China; Department of Surgery, Oregon Health and Science University, Portland, OR, USA.
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18
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Majumder A, Singh M, Behera J, Theilen NT, George AK, Tyagi N, Metreveli N, Tyagi SC. Hydrogen sulfide alleviates hyperhomocysteinemia-mediated skeletal muscle atrophy via mitigation of oxidative and endoplasmic reticulum stress injury. Am J Physiol Cell Physiol 2018; 315:C609-C622. [PMID: 30110564 DOI: 10.1152/ajpcell.00147.2018] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Although hyperhomocysteinemia (HHcy) occurs because of the deficiency in cystathionine-β-synthase (CBS) causing skeletal muscle dysfunction, it is still unclear whether this effect is mediated through oxidative stress, endoplasmic reticulum (ER) stress, or both. Nevertheless, there is no treatment option available to improve HHcy-mediated muscle injury. Hydrogen sulfide (H2S) is an antioxidant compound, and patients with CBS mutation do not produce H2S. In this study, we hypothesized that H2S mitigates HHcy-induced redox imbalance/ER stress during skeletal muscle atrophy via JNK phosphorylation. We used CBS+/- mice to study HHcy-mediated muscle atrophy, and treated them with sodium hydrogen sulfide (NaHS; an H2S donor). Proteins and mRNAs were examined by Western blots and quantitative PCR. Proinflammatory cytokines were also measured. Muscle mass and strength were studied via fatigue susceptibility test. Our data revealed that HHcy was detrimental to skeletal mass, particularly gastrocnemius and quadriceps muscle weight. We noticed that oxidative stress was reversed by NaHS in homocysteine (Hcy)-treated C2C12 cells. Interestingly, ER stress markers (GRP78, ATF6, pIRE1α, and pJNK) were elevated in vivo and in vitro, and NaHS mitigated these effects. Additionally, we observed that JNK phosphorylation was upregulated in C2C12 after Hcy treatment, but NaHS could not reduce this effect. Furthermore, inflammatory cytokines IL-6 and TNF-α were higher in plasma from CBS as compared with wild-type mice. FOXO1-mediated Atrogin-1 and MuRF-1 upregulation were attenuated by NaHS. Functional studies revealed that NaHS administration improved muscle fatigability in CBS+/- mice. In conclusion, our work provides evidence that NaHS is beneficial in mitigating HHcy-mediated skeletal injury incited by oxidative/ER stress responses.
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Affiliation(s)
- Avisek Majumder
- Department of Physiology, University of Louisville School of Medicine , Louisville, Kentucky.,Department of Biochemistry and Molecular Genetics, University of Louisville School of Medicine , Louisville, Kentucky
| | - Mahavir Singh
- Department of Physiology, University of Louisville School of Medicine , Louisville, Kentucky
| | - Jyotirmaya Behera
- Department of Physiology, University of Louisville School of Medicine , Louisville, Kentucky
| | - Nicholas T Theilen
- Department of Physiology, University of Louisville School of Medicine , Louisville, Kentucky
| | - Akash K George
- Department of Physiology, University of Louisville School of Medicine , Louisville, Kentucky
| | - Neetu Tyagi
- Department of Physiology, University of Louisville School of Medicine , Louisville, Kentucky
| | - Naira Metreveli
- Department of Physiology, University of Louisville School of Medicine , Louisville, Kentucky
| | - Suresh C Tyagi
- Department of Physiology, University of Louisville School of Medicine , Louisville, Kentucky
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19
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Qaradakhi T, Matsoukas MT, Hayes A, Rybalka E, Caprnda M, Rimarova K, Sepsi M, Büsselberg D, Kruzliak P, Matsoukas J, Apostolopoulos V, Zulli A. Alamandine reverses hyperhomocysteinemia-induced vascular dysfunction via PKA-dependent mechanisms. Cardiovasc Ther 2017; 35. [PMID: 28901725 DOI: 10.1111/1755-5922.12306] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2017] [Revised: 08/30/2017] [Accepted: 09/08/2017] [Indexed: 11/29/2022] Open
Abstract
INTRODUCTION Hyperhomocysteinemia (HHcy) impairs nitric oxide endothelium-dependent vasodilation, consequently leading to atherosclerosis, a risk factor for cardiovascular disease. Novel treatments for HHcy are necessary. AIM We tested the hypothesis that alamandine, a vasoactive peptide of the renin-angiotensin system (RAS), could reverse HHcy-induced vascular dysfunction through the MrgD receptor and that this is mediated by the protein kinase A (PKA) pathway. Furthermore, we sought to determine a putative binding model of alamandine to the MrgD receptor through docking and molecular dynamics simulations. METHOD The abdominal aorta was excised from New Zealand white rabbits (n = 15) and incubated with 3 mmol/L Hcy (to mimic HHcy) to induce vascular dysfunction in vitro. Vascular function was assessed by vasodilatory responses to cumulative doses of acetylcholine. RESULT Vasodilation was significantly impaired in HHcy-incubated aortic rings while alamandine reversed this effect (control, 74.2 ± 5.0%; Hcy, 30.3 ± 9.8%; alamandine + Hcy, 59.7 ± 4.8%, P < .0001). KT5720 (PKA inhibitor) significantly inhibited the ability of alamandine to attenuate the impaired vasodilation caused by HHcy (KT5720 + Hcy + alamandine, 27.1 ± 24.1, P < .01). Following immunohistochemistry analysis, the MrgD receptor was highly expressed within the media and endothelial layer of aortic rings in HHcy compared to control (media: 0.23 ± 0.003 vs control 0.16 ± 0.01, P < .05 and endothelium: 0.68 ± 0.07 vs control 0.13 ± 0.02, P < .01, in PA/I (A.U) units). Computational studies also propose certain interactions of alamandine within the MrgD transmembrane domain. CONCLUSION This study shows that alamandine is effective in reversing HHcy-induced vascular dysfunction, possibly through the PKA signaling pathway via MrgD. Our results indicate a therapeutic potential of alamandine in reversing the detrimental effects of HHcy.
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Affiliation(s)
- Tawar Qaradakhi
- Centre for Chronic Disease, College of Health and Biomedicine, Victoria University, Melbourne, Vic., Australia
| | | | - Alan Hayes
- Centre for Chronic Disease, College of Health and Biomedicine, Victoria University, Melbourne, Vic., Australia
| | - Emma Rybalka
- Centre for Chronic Disease, College of Health and Biomedicine, Victoria University, Melbourne, Vic., Australia
| | - Martin Caprnda
- 2nd Department of Internal Medicine, Faculty of Medicine, Comenius University, Bratislava, Slovakia
| | - Kvetoslava Rimarova
- Department of Public Health and Hygiene, Faculty of Medicine, Pavol Jozef Safarik University, Kosice, Slovakia
| | - Milan Sepsi
- Department of Internal Medicine and Cardiology, University Hospital, Brno, Czech Republic
| | - Dietrich Büsselberg
- Department of Physiology and Biophysics, Weill Cornell Medical College in Qatar, Qatar Foundation - Education City, Doha, Qatar
| | - Peter Kruzliak
- Department of Chemical Drugs, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences, Brno, Czech Republic
| | | | - Vasso Apostolopoulos
- Centre for Chronic Disease, College of Health and Biomedicine, Victoria University, Melbourne, Vic., Australia
| | - Anthony Zulli
- Centre for Chronic Disease, College of Health and Biomedicine, Victoria University, Melbourne, Vic., Australia
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20
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Zhang Z, Zhu LL, Jiang HS, Chen H, Chen Y, Dai YT. Demethylation treatment restores erectile function in a rat model of hyperhomocysteinemia. Asian J Androl 2017; 18:763-8. [PMID: 26585696 PMCID: PMC5000801 DOI: 10.4103/1008-682x.163271] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Methylation modification is an important cellular mechanism of gene expression regulation. Dimethylarginine dimethylaminohydrolase-2 (DDAH-2) protein is a pivotal molecular for endothelium function. To explore the effects of 5-aza-deoxycytidine (5-aza), a demethylation agent, in hyperhomocysteinemia (hhcy)-related erectile dysfunction (ED) rats, 5-aza (1 mg kg−1) was administrated to Sprague-Dawley hhcy-rats induced by supplemented methionine chow diet. Erectile function, nitric oxide-cyclic guanosine monophosphate (NO-cGMP) levels, expression of DDAH-2 protein and promoter methylation status of DDAH-2 were studied in the corpora cavernosa. We found that supplemented methionine diet induced a high homocysteine level after 6 weeks of treatment. DDAH-2 protein was down-regulated in the corpora cavernosa while the administration of 5-aza up-regulated DDAH-2 expression and restored erectile function. The methionine-fed rats showed high methylation levels of DDAH-2 promoter region while the group treated with 5-aza demonstrated lower-methylation levels when compared to the methionine-fed group. Besides, the administration of 5-aza improved NO and cGMP levels in methionine-fed rats. Therefore, the methylation mechanism involves in ED pathogenesis, and demethylation offers a potential new strategy for ED treatment.
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Affiliation(s)
- Zheng Zhang
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Lei-Lei Zhu
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - He-Song Jiang
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Hai Chen
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Yun Chen
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Yu-Tian Dai
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
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21
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Zhang Z, Xu Z, Dai Y, Chen Y. Elevated serum homocysteine level as an independent risk factor for erectile dysfunction: a prospective pilot case-control study. Andrologia 2016; 49. [PMID: 27709655 DOI: 10.1111/and.12684] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/15/2016] [Indexed: 12/20/2022] Open
Abstract
Homocysteine is an amino acid that is produced from the metabolic demethylation of dietary methionine. It has gained arising attention for its association with increased risk of myocardial infarction, stroke and venous thromboembolism. Erectile dysfunction (ED), especially for vasculogenic ED, is a vascular disorder of cavernosal vascular bed. In this prospective pilot case-control study, we investigated plasma homocysteine levels in 32 ED patients and 20 healthy control men. Related patients characteristics including age, weight, height, marital status, smoking and drinking status, level of education were collected and analysed as well as penile colour Doppler ultrasound parameters. ED patients were further categorised into mild, moderate and severe ED based on 5-item of the International Index of Erectile Function. Higher homocysteine levels were observed in ED patients as compared with controls (p < .05). A multivariate logistic regression with likelihood ratio test revealed that homocysteine and penile peak systolic blood flow velocity (PSV) levels posed significant indicators for ED (chi-square of likelihood ratio = 20.42, df = 2, p < .005) as well as moderate and severe ED occurrence (chi-square of likelihood ratio = 28.50, df = 2, p < .005). The threshold value of homocysteine concentration to discriminate ED and control subjects was 12.65 μmol/L by performing receiver operating characteristic curve analyses. These data suggested that elevation of homocysteine levels was associated with an increased risk of ED.
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Affiliation(s)
- Z Zhang
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Z Xu
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Y Dai
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
| | - Y Chen
- Department of Andrology, Affiliated Drum Tower Hospital, School of Medicine, Nanjing University, Nanjing, China
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Alleviation of hepatic fat accumulation by betaine involves reduction of homocysteine via up-regulation of betaine-homocysteine methyltransferase (BHMT). Biochem Biophys Res Commun 2016; 477:440-7. [DOI: 10.1016/j.bbrc.2016.06.080] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2016] [Accepted: 06/15/2016] [Indexed: 01/08/2023]
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Amin HK, El-Sayed MIK, Leheta OF. Homocysteine as a predictive biomarker in early diagnosis of renal failure susceptibility and prognostic diagnosis for end stages renal disease. Ren Fail 2016; 38:1267-75. [PMID: 27435113 DOI: 10.1080/0886022x.2016.1209382] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Glomerular filtration rate and/or creatinine are not accurate methods for renal failure prediction. This study tested homocysteine (Hcy) as a predictive and prognostic marker for end stage renal disease (ESRD). In total, 176 subjects were recruited and divided into: healthy normal group (108 subjects); mild-to-moderate impaired renal function group (21 patients); severe impaired renal function group (7 patients); and chronic renal failure group (40 patients) who were on regular hemodialysis. Blood samples were collected, and serum was separated for analysis of total Hcy, creatinine, high sensitive C-reactive protein (CRP), serum albumin, and calcium. Data showed that Hcy level was significantly increased from normal-to-mild impairment then significantly decreases from mild impairment until the patient reaches severe impairment while showing significant elevation in the last stage of chronic renal disease. Creatinine level was increased in all stages of kidney impairment in comparison with control. CRP level was showing significant elevation in the last stage. A significant decrease in both albumin and calcium was occurred in all stages of renal impairment. We conclude Hcy in combination with CRP, creatinine, albumin, and calcium can be used as a prognostic marker for ESRD and an early diagnostic marker for the risk of renal failure.
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Affiliation(s)
- Hatem K Amin
- a Department of Biochemistry and Molecular Biology, Faculty of Pharmacy , Helwan University , Cairo , Egypt ;,b Cell Cycle Control Group, Center for Chromosome Biology , National University of Ireland , Galway , Ireland
| | - Mohamed-I Kotb El-Sayed
- a Department of Biochemistry and Molecular Biology, Faculty of Pharmacy , Helwan University , Cairo , Egypt
| | - Ola F Leheta
- c Department of Clinical Pathology, Faculty of Medicine , University Hospital, Suez Canal University , Ismailia , Egypt
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Long Y, Nie J. Homocysteine in Renal Injury. KIDNEY DISEASES 2016; 2:80-7. [PMID: 27536696 DOI: 10.1159/000444900] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 02/23/2016] [Indexed: 12/13/2022]
Abstract
BACKGROUND Homocysteine (Hcy) is an intermediate of methionine metabolism. Hyperhomocysteinemia (HHcy) can result from a deficiency in the enzymes or vitamin cofactors required for Hcy metabolism. Patients with renal disease tend to be hyperhomocysteinemic, particularly as renal function declines, although the underlying cause of HHcy in renal disease is not entirely understood. SUMMARY HHcy is considered a risk or pathogenic factor in the progression of chronic kidney disease (CKD) as well as the cardiovascular complications. KEY MESSAGES In this review, we summarize both clinical and experimental findings that reveal the contribution of Hcy as a pathogenic factor to the development of CKD. In addition, we discuss several important mechanisms mediating the pathogenic action of Hcy in the kidney, such as local oxidative stress, endoplasmic reticulum stress, inflammation and hypomethylation.
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Affiliation(s)
- Yanjun Long
- State Key Laboratory of Organ Failure Research, National Clinical Research Center of Kidney Disease, Division of Nephrology, Nanfang Hospital, Southern Medical University, Guangzhou, Guiyang, PR China; Division of Nephrology, Guizhou Provincial People's Hospital, Guizhou Provincial Institute of Nephritic and Urinary Disease, Guiyang, PR China
| | - Jing Nie
- State Key Laboratory of Organ Failure Research, National Clinical Research Center of Kidney Disease, Division of Nephrology, Nanfang Hospital, Southern Medical University, Guangzhou, Guiyang, PR China
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El Hajj Chehadeh SW, Jelinek HF, Al Mahmeed WA, Tay GK, Odama UO, Elghazali GEB, Al Safar HS. Relationship between MTHFR C677T and A1298C gene polymorphisms and complications of type 2 diabetes mellitus in an Emirati population. Meta Gene 2016; 9:70-5. [PMID: 27222819 PMCID: PMC4856855 DOI: 10.1016/j.mgene.2016.04.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 04/11/2016] [Accepted: 04/15/2016] [Indexed: 11/25/2022] Open
Abstract
Purpose Type 2 diabetes mellitus (T2DM) is the most common form of diabetes with clinical consequences giving rise to chronic multiple organ complications. Methylenetetrahydrofolate reductase (MTHFR) polymorphisms are genetic variations that have been linked to T2DM, and micro/macrovascular complications. The link between MTHFR and T2DM however is strongly dependent on the ethnic group studied. The objective of this study was to investigate the possible association between two MTHFR polymorphisms (C677T and A1298C) and T2DM and specifically examine if there are any associations with clinical and demographic characteristics among patients in the United Arab Emirates (UAE). Methods The study included 169 T2DM patients and 209 healthy controls. Genomic DNA was isolated and genotyped using TaqMan real-Time PCR assays for the MTHFR C677T and A1298C polymorphisms. Results There were no significant differences in genotype and haplotype distributions observed between groups. A significant association was observed between the C677T polymorphism and history of cerebrovascular accident (CVA) (p = 0.0330), history of nephropathy (p = 0.0280) and levels of LDL cholesterol (p = 0.0409). Also, the A1298C polymorphism was associated with hypertriglyceridemia (p = 0.0305) in T2DM patients. Conclusion These findings demonstrate that the MTHFR gene polymorphisms are not related to T2DM in the Emirati population. However, these polymorphisms can be used as risk markers for CVA, nephropathy, high LDL cholesterol and triglycerides in T2DM patients and allow timely treatment.
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Affiliation(s)
| | - Herbert F Jelinek
- School of Community Health and Centre for Research in Complex Systems, Charles Sturt University, Albury, New South Wales, Australia
| | - Wael A Al Mahmeed
- Institute of Cardiac Science, Sheikh Khalifa Medical City, Abu Dhabi, United Arab Emirates
| | - Guan K Tay
- Centre for Forensic Science, University of Western Australia, Perth, Australia
| | - Unini O Odama
- Landmark Nephrology and Hypertension Clinic, Talladega, AL, USA
| | - Gehad E B Elghazali
- Institute of Laboratory Medicine, Sheikh Khalifa Medical City, Abu Dhabi, United Arab Emirates
| | - Habiba S Al Safar
- Khalifa University Center of Biotechnology, Abu Dhabi, United Arab Emirates; Faculty of Biomedical Engineering, Khalifa University of Science, Technology & Research, Abu Dhabi, United Arab Emirates
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Longoni A, Kolling J, dos Santos TM, dos Santos JP, da Silva JS, Pettenuzzo L, Gonçalves CA, de Assis AM, Quincozes-Santos A, Wyse ATS. 1,25-Dihydroxyvitamin D3 exerts neuroprotective effects in an ex vivo model of mild hyperhomocysteinemia. Int J Dev Neurosci 2015; 48:71-9. [PMID: 26658316 DOI: 10.1016/j.ijdevneu.2015.11.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 11/03/2015] [Accepted: 11/19/2015] [Indexed: 02/02/2023] Open
Abstract
Elevated plasma homocysteine (Hcy) levels have been detected in patients with various neurodegenerative conditions. Studies of brain tissue have revealed that hyperhomocysteinemia may impair energy metabolism, resulting in neuronal damage. In addition, new evidence has indicated that vitamin D plays crucial roles in brain development, brain metabolism and neuroprotection. The aim of this study was to investigate the neuroprotective effects of 1,25-dihydroxivitamin D3 (calcitriol) in cerebral cortex slices that were incubated with a mild concentration of Hcy. Cerebral cortex slices from adult rats were first pre-treated for 30 min with one of three different concentrations of calcitriol (50 nM, 100 nM and 250 nM), followed by Hcy for 1h to promote cellular dysfunction. Hcy caused changes in bioenergetics parameters (e.g., respiratory chain enzymes) and mitochondrial functions by inducing changes in mitochondrial mass and swelling. Here, we used flow cytometry to analyze neurons that were double-labelled with Propidium Iodide (PI) and found that Hcy induced an increase in NeuN(+)/PI cells but did not affect GFAP(+)/Pi cells. Hcy also induced oxidative stress by increasing reactive oxygen species generation, lipid peroxidation and protein damage and reducing the activity of antioxidant enzymes (e.g., SOD, CAT and GPx). Calcitriol (50 nM) prevented these alterations by increasing the level of the vitamin D receptor. Our findings suggest that using calcitriol may be a therapeutic strategy for treating the cerebral complications caused by Hcy.
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Affiliation(s)
- Aline Longoni
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Janaina Kolling
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Tiago M dos Santos
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - João Paulo dos Santos
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Jussemara Souza da Silva
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Letícia Pettenuzzo
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Carlos-Alberto Gonçalves
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Adriano M de Assis
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - André Quincozes-Santos
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil; Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil
| | - Angela T S Wyse
- Postgraduate Program in Biochemistry, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil; Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS 90035-003, Brazil.
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Abushik PA, Karelina TV, Sibarov DA, Stepanenko YD, Giniatullin RA, Antonov SM. Homocysteine-induced membrane currents, calcium responses and changes in mitochondrial potential in rat cortical neurons. J EVOL BIOCHEM PHYS+ 2015. [DOI: 10.1134/s0022093015040055] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Chen D, Wei X, Zou J, Wang R, Liu X, Xu X, Lu J, Wang Z, Tang B, Wang B, Jin K, Wang Q. Contra-Directional Expression of Serum Homocysteine and Uric Acid as Important Biomarkers of Multiple System Atrophy Severity: A Cross-Sectional Study. Front Cell Neurosci 2015. [PMID: 26217177 PMCID: PMC4492156 DOI: 10.3389/fncel.2015.00247] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
HIGHLIGHTS Serum Hcy was higher in MSA patients when compared to healthy subjects, particularly in male patients.Serum UA was lower in MSA patients when compared healthy subjects, particularly in male patients.Serum Hcy levels were significantly positively correlated with the severity of MSA.The ROC curve for the combination of Hcy and UA showed potential diagnostic value in discriminating MSA from healthy subjects. AIM There is evidence suggesting that inflammatory responses play a critical role in the pathogenesis of multiple system atrophy (MSA). Whether inflammatory mediators can be used as reliable biomarkers to detect the severity and progression of MSA remains largely unknown. METHODS We performed a cross-sectional study that included 47 patients with MSA and 50 healthy age-matched controls. Serum levels of homocysteine (Hcy), uric acid (UA), and C-reactive protein (CRP) were measured. These levels positively correlated with the severity of MSA, based on both motor and non-motor symptoms. Several scales were used to rate the severity of MSA, including the Unified multiple system atrophy rating scale, Parkinson's disease sleep scale, Non-motor Symptoms Scale, the Schwab & England activities of daily living scale, Webster Scale, modified Hoehn and Yahr staging scale, and the Mini-Mental State Examination. Receiver operating characteristic (ROC) curves was applied to map the diagnostic accuracy of MSA against healthy subjects. RESULTS Compared with healthy subjects, we found that serum Hcy was higher, UA was lower, and CRP levels were unchanged in MSA patients. These findings were especially prominent in male patients. No significant differences of serum Hcy and UA were observed between patients of MSA and PD. Interestingly, there was a significant correlation between Hcy levels and MSA severity such as movement dysfunction, declined cognition, and cardiovascular symptoms. Additionally, the ROC curve for the combination of Hcy and UA (AUC 0.736) showed potential diagnostic value in discriminating MSA from healthy subjects. CONCLUSION Our findings suggest that the inflammatory mediators Hcy and UA may play important roles in the pathogenesis of MSA. The measurement of serum Hcy and UA levels could then be a useful tool to accurately distinguish MSA from healthy subjects.
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Affiliation(s)
- Dan Chen
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University , Guangzhou , China
| | - Xiaobo Wei
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University , Guangzhou , China
| | - Jing Zou
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University , Guangzhou , China
| | - Rui Wang
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University , Guangzhou , China
| | - Xu Liu
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University , Guangzhou , China
| | - Xiaofeng Xu
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University , Guangzhou , China
| | - Jianjun Lu
- Department of Neurology, Guangdong 999 Brain Hospital , Guangzhou , China
| | - Zhanhang Wang
- Department of Neurology, Guangdong 999 Brain Hospital , Guangzhou , China
| | - Beisha Tang
- The State Key Laboratory of Medical Genetics, Central South University , Changsha , China
| | - Brian Wang
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center , Fort Worth, TX , USA
| | - Kunlin Jin
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center , Fort Worth, TX , USA
| | - Qing Wang
- Department of Neurology, The Third Affiliated Hospital of Sun Yat-Sen University , Guangzhou , China
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Black tea protects against hypertension-associated endothelial dysfunction through alleviation of endoplasmic reticulum stress. Sci Rep 2015; 5:10340. [PMID: 25976123 PMCID: PMC4432571 DOI: 10.1038/srep10340] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2014] [Accepted: 04/10/2015] [Indexed: 12/24/2022] Open
Abstract
Hypertensive patients have been found to be associated with elevated levels of homocysteine, known as hyperhomocysteinemia. Homocysteine (Hcy) can induce endoplasmic reticulum (ER) stress in endothelial cells. This study aims to investigate whether black tea (BT) protects against hypertension-associated endothelial dysfunction through alleviation of ER stress. Rat aortae and cultured rat aortic endothelial cells were treated with Hcy, BT extract, and theaflavin-3,3'-digallate (TF3). Male Sprague Dawley rats were infused with angiotensin II (Ang II) to induce hypertension and orally administrated with BT extract at 15 mg/kg/day for 2 weeks. Hcy impaired endothelium-dependent relaxations of rat aortae and led to ER stress in endothelial cells, which were ameliorated by co-incubation of BT extract and TF3. The blood pressure of Ang II-infused rats and plasma Hcy level were normalized by BT consumption. Impaired endothelium-dependent relaxations in renal arteries, carotid arteries and aortae, and flow-mediated dilatations in third-order mesenteric resistance arteries were improved. Elevations of ER stress markers and ROS level, plus down-regulation of Hcy metabolic enzymes in aortae from Ang II-infused rats were prevented by BT treatment. Our data reveal the novel cardiovascular benefits of BT in ameliorating vascular dysfunctions, providing insight into developing BT into beneficial dietary supplements in hypertensive patients.
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Heifetz EM, Birk RZ. MTHFR C677T polymorphism affects normotensive diastolic blood pressure independently of blood lipids. Am J Hypertens 2015; 28:387-92. [PMID: 25165067 DOI: 10.1093/ajh/hpu152] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism was found to be associated with hypertension. High blood pressure (BP) is a major risk factor for cardiovascular disease, gestational hypertension, and high-risk pregnancy. BP is a complex trait strongly associated with blood lipid parameters. However, studies of the effect of MTHFR C677T polymorphism on BP levels independently of blood lipids are scarce. Our objective was to analyze and quantify the effect of MTHFR C677T polymorphism on normotensive BP independently of blood lipids. METHODS MTHFR C677T genotyping was done for 151 Israeli women attending the genetics clinic at Soroka Medical Center. Biochemical (blood lipids) and BP data were extracted from Soroka Medical Center records. BP was regarded as a continuous parameter using analysis of covariance and post hoc Tukey's HSD (honestly significant difference) analysis. RESULTS The frequencies of genotypes CC, TT, and CT were 41%, 12%, and 47%, respectively. A significant (P < 0.0001) association was found between genotype and diastolic BP (DBP) when adjusted to body mass index and age. Mean DBP was significantly lower for CC than for TT genotypes (71.2 vs. 78.7 mm Hg); however the difference between the heterozygotes (73.9 mm Hg) and the other 2 genotypes was not significant. Cholesterol, LDLcalc (LDLcalculaed), and homocysteine blood levels significantly contributed to the effect of MTHFR C677T polymorphism on the DBP trait. There was also significant association between genotype and folic acid levels. CONCLUSIONS MTHFR C677T polymorphism significantly affects DBP in Israeli women, independently of blood lipids. Each C to T substitution is associated with a mean 3.4-mm Hg increase in DBP.
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Affiliation(s)
- Eliyahu M Heifetz
- Department of Accounting and Data Management, Lev Academic Center, Jerusalem, Israel
| | - Ruth Z Birk
- Department of Nutrition, Faculty of Health Science, Ariel University, Ariel, Israel.
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Endoplasmic reticulum stress signaling in mammalian oocytes and embryos: life in balance. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2015; 316:227-65. [PMID: 25805126 DOI: 10.1016/bs.ircmb.2015.01.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Mammalian oocytes and embryos are exquisitely sensitive to a wide range of insults related to physical stress, chemical exposure, and exposures to adverse maternal nutrition or health status. Although cells manifest specific responses to various stressors, many of these stressors intersect at the endoplasmic reticulum (ER), where disruptions in protein folding and production of reactive oxygen species initiate downstream signaling events. These signals modulate mRNA translation and gene transcription, leading to recovery, activation of autophagy, or with severe and prolonged stress, apoptosis. ER stress signaling has recently come to the fore as a major contributor to embryo demise. Accordingly, agents that modulate or inhibit ER stress signaling have yielded beneficial effects on embryo survival and long-term developmental potential. We review here the mechanisms of ER stress signaling, their connections to mammalian oocytes and embryos, and the promising indications that interventions in this pathway may provide new opportunities for improving mammalian reproduction and health.
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Debreceni B, Debreceni L. The role of homocysteine-lowering B-vitamins in the primary prevention of cardiovascular disease. Cardiovasc Ther 2014; 32:130-8. [PMID: 24571382 DOI: 10.1111/1755-5922.12064] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Cardiovascular disease (CVD) is the leading cause of mortality in the Western world. The effort of research should aim at the primary prevention of CVD. Alongside statin therapy, which is maintained to be an effective method of CVD prevention, there are alternative methods such as vitamin B substitution therapy with folic acid (FA), and vitamins B12 and B6 . B-vitamins may inhibit atherogenesis by decreasing the plasma level of homocysteine (Hcy)-a suspected etiological factor for atherosclerosis-and by other mechanisms, primarily through their antioxidant properties. Although Hcy-lowering vitamin trials have failed to demonstrate beneficial effects of B-vitamins in the prevention of CVD, a meta-analysis and stratification of a number of large vitamin trials have suggested their effectiveness in cardiovascular prevention (CVP) in some aspects. Furthermore, interpretation of the results from these large vitamin trials has been troubled by statin/aspirin therapy, which was applied along with the vitamin substitution, and FA fortification, both of which obscured the separate effects of vitamins in CVP. Recent research results have accentuated a new approach to vitamin therapy for CVP. Studies undertaken with the aim of primary prevention have shown that vitamin B substitution may be effective in the primary prevention of CVD and may also be an option in the secondary prevention of disease if statin therapy is accompanied by serious adverse effects. Further investigations are needed to determine the validity of vitamin substitution therapy before its introduction in the protocol of CVD prevention.
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Affiliation(s)
- Balazs Debreceni
- Department of Biochemistry and Medical Chemistry, Medical School, University of Pecs, Pecs, Hungary
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Coimbra RS, Calegare BFA, Candiani TMS, D'Almeida V. A putative role for homocysteine in the pathophysiology of acute bacterial meningitis in children. BMC Clin Pathol 2014; 14:43. [PMID: 25477764 PMCID: PMC4255930 DOI: 10.1186/1472-6890-14-43] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 11/12/2014] [Indexed: 11/10/2022] Open
Abstract
Background Acute bacterial meningitis frequently causes cortical and hippocampal neuron loss leading to permanent neurological sequelae. Neuron death in acute bacterial meningitis involves the excessive activation of NMDA receptors and p53-mediated apoptosis, and the latter is triggered by the depletion of NAD + and ATP cellular stores by the DNA repair enzyme poly(ADP-ribose) polymerase. This enzyme is activated during acute bacterial meningitis in response to DNA damage induced, on its turn, by reactive oxygen and nitrogen species. An excess of homocysteine can also induce this cascade of events in hippocampal neurons. The present work aimed at investigating the possible involvement of homocysteine in the pathophysiology of meningitis by comparing its concentrations in cerebrospinal fluid (CSF) samples from children with viral or acute bacterial meningitis, and control individuals. Methods Homocysteine and cysteine concentrations were assessed by high-performance liquid chromatography in CSF samples from nine patients with acute bacterial meningitis, 13 patients with viral meningitis and 18 controls (median age: 4 years-old; range: <1 to 13) collected by lumbar puncture at admission at the Children's Hospital Joao Paulo II - FHEMIG, from January 2010 to November 2011. Results We found that homocysteine accumulates up to neurotoxic levels within the central nervous system of patients with acute bacterial meningitis, but not in those with viral meningitis or control individuals. No correlation was found between homocysteine and cysteine concentrations and the cerebrospinal fluid standard cytochemical parameters. Conclusions Our results suggest that HCY is produced intrathecally in response to acute bacterial meningitis and accumulates within the central nervous system reaching potentially neurotoxic levels. This is the first work to propose a role for HCY in the pathophysiology of brain damage associated with acute bacterial meningitis.
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Affiliation(s)
- Roney Santos Coimbra
- Biosystems Informatics, Research Center Rene Rachou, FIOCRUZ, Av. Augusto de Lima 1715, Belo Horizonte, MG Zip Code: 30190-002 Brazil
| | | | | | - Vânia D'Almeida
- Department of Psychobiology, Universidade Federal de São Paulo (UNIFESP/EPM), São Paulo, SP Brazil
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Mani M, Golmohammadi T, Khaghani S, Zamani Z, Azadmanesh K, Meshkani R, Pasalar P. Homocysteine induces heme oxygenase-1 expression via transcription factor Nrf2 activation in HepG2 cell. IRANIAN BIOMEDICAL JOURNAL 2014; 17:93-100. [PMID: 23567851 DOI: 10.6091/ibj.1158.2013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
BACKGROUND Elevated level of plasma homocysteine has been related to various diseases. Patients with hyperhomocysteinemia can develop hepatic steatosis and fibrosis. We hypothesized that oxidative stress induced by homocysteine might play an important role in pathogenesis of liver injury. Also, the cellular response designed to combat oxidative stress is primarily controlled by the transcription factor Nrf2, a principal inducer of anti-oxidant and phase II-related genes. METHODS HepG2 cells were treated with homocysteine in different time periods. Glutathione content was measured by flowcytometry. Using electrophoretic mobility shift assay (EMSA) and Western-blotting, anti-oxidant response element (ARE)-binding activity of Nrf2 for heme ocygenase-1 (HO-1) was demonstrated. Real time RT-PCR and Western-blotting were performed to evaluate whether homocysteine was able to induce mRNA and protein expression of HO-1. RESULTS The role of Nrf2 in cellular response to homocysteine is substantiated by the following observations in HepG2 cells exposed to homocysteine (i) Western-blotting revealed that Nrf2 is strongly stabilized and became detectable in nuclear extracts. (ii) EMSA demonstrated increased binding of Nrf2 to oligomers containing HO-1 promoter-specific ARE-binding site. (iii) Real time RT-PCR and Western-blotting revealed increased mRNA and protein expression of inducible gene HO-1 after treatment with homocysteine. CONCLUSION Data presented in the current study provide direct evidence that the immediate cellular response to oxidative stress provoked by homocysteine is orchestrated mainly by the Nrf2-ARE pathway. Therefore, induction of Nrf2-ARE-dependent expression of HO-1 could be a therapeutic option for hepatic cells damage induced by homocysteine.
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Affiliation(s)
- Monireh Mani
- Dept. of Biochemistry, School of Medicine, Tehran University of Medical Science, Tehran, Iran
| | - Taghi Golmohammadi
- Dept. of Biochemistry, School of Medicine, Tehran University of Medical Science, Tehran, Iran
| | - Shahnaz Khaghani
- Dept. of Biochemistry, School of Medicine, Tehran University of Medical Science, Tehran, Iran
| | - Zahra Zamani
- Dept. of Biochemistry, Pasteur Institute of Iran, Tehran, Iran
| | | | - Reza Meshkani
- Dept. of Biochemistry, School of Medicine, Tehran University of Medical Science, Tehran, Iran
| | - Parvin Pasalar
- Dept. of Biochemistry, School of Medicine, Tehran University of Medical Science, Tehran, Iran
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Prevalence of thrombophilic gene polymorphisms (FVL G1691A and MTHFR C677T) in patients with myocardial infarction. EGYPTIAN JOURNAL OF MEDICAL HUMAN GENETICS 2014. [DOI: 10.1016/j.ejmhg.2014.02.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
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Abushik PA, Niittykoski M, Giniatullina R, Shakirzyanova A, Bart G, Fayuk D, Sibarov DA, Antonov SM, Giniatullin R. The role of NMDA and mGluR5 receptors in calcium mobilization and neurotoxicity of homocysteine in trigeminal and cortical neurons and glial cells. J Neurochem 2013; 129:264-74. [DOI: 10.1111/jnc.12615] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 11/19/2013] [Accepted: 11/19/2013] [Indexed: 02/06/2023]
Affiliation(s)
- Polina A. Abushik
- Department of Neurobiology; A. I. Virtanen Institute for Molecular Sciences; University of Eastern Finland; Kuopio Finland
- Laboratory of Comparative Physiology of Cerebellum; Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Academy of Science; Saint-Petersburg Russia
| | - Minna Niittykoski
- Department of Neurobiology; A. I. Virtanen Institute for Molecular Sciences; University of Eastern Finland; Kuopio Finland
- Biotechnology and Molecular Medicine; A. I. Virtanen Institute for Molecular Sciences; University of Eastern Finland; Kuopio Finland
| | - Raisa Giniatullina
- Department of Neurobiology; A. I. Virtanen Institute for Molecular Sciences; University of Eastern Finland; Kuopio Finland
| | - Anastasia Shakirzyanova
- Department of Neurobiology; A. I. Virtanen Institute for Molecular Sciences; University of Eastern Finland; Kuopio Finland
| | - Genevieve Bart
- Department of Neurobiology; A. I. Virtanen Institute for Molecular Sciences; University of Eastern Finland; Kuopio Finland
| | - Dmitriy Fayuk
- Department of Neurobiology; A. I. Virtanen Institute for Molecular Sciences; University of Eastern Finland; Kuopio Finland
| | - Dmitry A. Sibarov
- Laboratory of Comparative Physiology of Cerebellum; Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Academy of Science; Saint-Petersburg Russia
- Laboratory of Molecular Neurodegeneration; Saint-Petersburg State Polytechnic University; Saint-Petersburg Russia
| | - Sergei M. Antonov
- Laboratory of Comparative Physiology of Cerebellum; Sechenov Institute of Evolutionary Physiology and Biochemistry of the Russian Academy of Science; Saint-Petersburg Russia
- Laboratory of Molecular Neurodegeneration; Saint-Petersburg State Polytechnic University; Saint-Petersburg Russia
| | - Rashid Giniatullin
- Department of Neurobiology; A. I. Virtanen Institute for Molecular Sciences; University of Eastern Finland; Kuopio Finland
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Abbas S, Raza ST, Ahmed F, Ahmad A, Rizvi S, Mahdi F. Association of genetic polymorphism of PPARγ-2, ACE, MTHFR, FABP-2 and FTO genes in risk prediction of type 2 diabetes mellitus. J Biomed Sci 2013; 20:80. [PMID: 24156506 PMCID: PMC4015124 DOI: 10.1186/1423-0127-20-80] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2013] [Accepted: 10/01/2013] [Indexed: 01/05/2023] Open
Abstract
Type 2 diabetes mellitus (T2DM) is a non-autoimmune, complex, heterogeneous and polygenic metabolic disease condition characterized by persistent elevated blood glucose levels (hyperglycemia). India as said to be the diabetic capital of the world is likely to experience the largest increase in T2DM and a greater number of diabetic individuals in the world by the year 2030. Identification of specific genetic variations in a particular ethnic group has a critical role in understanding the risk of developing T2DM in a much efficient way in future. These genetic variations include numerous types of polymorphisms among which single nucleotide polymorphisms (SNPs) is the most frequent. SNPs are basically located within the regulatory elements of several gene sequences. There are scores of genes interacting with various environmental factors affecting various pathways and sometimes even the whole signalling network that cause diseases like T2DM. This review discusses the biomarkers for early risk prediction of T2DM. Such predictions could be used in order to understand the pathogenesis of T2DM and to better diagnostics, treatment, and eventually prevention.
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Affiliation(s)
- Shania Abbas
- Molecular Biology Lab, Department of Biochemistry, Era’s Lucknow Medical College and Hospital, Lucknow 226003, India
| | - Syed Tasleem Raza
- Molecular Biology Lab, Department of Biochemistry, Era’s Lucknow Medical College and Hospital, Lucknow 226003, India
| | - Faisal Ahmed
- Molecular Biology Lab, Department of Biochemistry, Era’s Lucknow Medical College and Hospital, Lucknow 226003, India
| | - Absar Ahmad
- Molecular Biology Lab, Department of Biochemistry, Era’s Lucknow Medical College and Hospital, Lucknow 226003, India
| | - Saliha Rizvi
- Molecular Biology Lab, Department of Biochemistry, Era’s Lucknow Medical College and Hospital, Lucknow 226003, India
| | - Farzana Mahdi
- Molecular Biology Lab, Department of Biochemistry, Era’s Lucknow Medical College and Hospital, Lucknow 226003, India
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Veeranki S, Tyagi SC. Defective homocysteine metabolism: potential implications for skeletal muscle malfunction. Int J Mol Sci 2013; 14:15074-91. [PMID: 23873298 PMCID: PMC3742288 DOI: 10.3390/ijms140715074] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Revised: 06/24/2013] [Accepted: 07/11/2013] [Indexed: 12/13/2022] Open
Abstract
Hyperhomocysteinemia (HHcy) is a systemic medical condition and has been attributed to multi-organ pathologies. Genetic, nutritional, hormonal, age and gender differences are involved in abnormal homocysteine (Hcy) metabolism that produces HHcy. Homocysteine is an intermediate for many key processes such as cellular methylation and cellular antioxidant potential and imbalances in Hcy production and/or catabolism impacts gene expression and cell signaling including GPCR signaling. Furthermore, HHcy might damage the vagus nerve and superior cervical ganglion and affects various GPCR functions; therefore it can impair both the parasympathetic and sympathetic regulation in the blood vessels of skeletal muscle and affect long-term muscle function. Understanding cellular targets of Hcy during HHcy in different contexts and its role either as a primary risk factor or as an aggravator of certain disease conditions would provide better interventions. In this review we have provided recent Hcy mediated mechanistic insights into different diseases and presented potential implications in the context of reduced muscle function and integrity. Overall, the impact of HHcy in various skeletal muscle malfunctions is underappreciated; future studies in this area will provide deeper insights and improve our understanding of the association between HHcy and diminished physical function.
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Affiliation(s)
- Sudhakar Veeranki
- Authors to whom correspondence should be addressed; E-Mails: (S.V.); (S.C.T.); Tel.: +1-973-610-1160 (S.V.); +1-502-852-3381 (S.C.T.); Fax: +1-502-852-6239 (S.C.T.)
| | - Suresh C. Tyagi
- Authors to whom correspondence should be addressed; E-Mails: (S.V.); (S.C.T.); Tel.: +1-973-610-1160 (S.V.); +1-502-852-3381 (S.C.T.); Fax: +1-502-852-6239 (S.C.T.)
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Activation of AMP-activated protein kinase alleviates homocysteine-mediated neurotoxicity in SH-SY5Y cells. Neurochem Res 2013; 38:1561-71. [PMID: 23624826 DOI: 10.1007/s11064-013-1057-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Revised: 04/11/2013] [Accepted: 04/19/2013] [Indexed: 10/26/2022]
Abstract
Mammalian AMP-activated protein kinase (AMPK) acts as a metabolite-sensing protein kinase in multiple tissues. Recent studies have shown that AMPK activation also regulates intracellular signaling pathways involved in cellular survival and apoptosis. Previously, we have reported that AMPK activation alleviates the endoplasmic reticulum (ER) stress-mediated neurotoxicity and tau hyperphosphorylation caused by palmitate. Therefore, we investigated whether AMPK activation alleviates ER stress-mediated neurotoxicity in SH-SY5Y human neuroblastoma cells incubated with homocysteine. Regulation of AMPK activity by isoflavone was also determined to investigate the underlying mechanism of its neuroprotective effect. Treatment of SH-SY5Y human neuroblastoma cells with N (1)-(β-D-ribofuranosyl)-5-aminoimidazole-4-carboxamide (AICAR), a pharmacological activator of AMPK, significantly protected cells against cytotoxicity imposed by tunicamycin and homocysteine. Homocysteine significantly suppressed AMPK activation, which was alleviated by AICAR. We observed a significant inhibition of the unfolded protein response by AICAR in cells incubated with homocysteine, suggesting a protective role of AMPK activation against ER stress-mediated neurotoxicity. AICAR also significantly reduced tau hyperphosphorylation by inactivating glycogen synthase kinase-3β and c-Jun N-terminal kinase in cells incubated with homocysteine. Furthermore, treatment of cells with soy isoflavone, genistein and daidzein significantly activated AMPK, which was repressed by tunicamycin and homocysteine. Therefore, our results suggest that AMPK activation by isoflavone as well as AICAR alleviates homocysteine-mediated neurotoxicity in SH-SY5Y cells.
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Decreased vitamin B12 availability induces ER stress through impaired SIRT1-deacetylation of HSF1. Cell Death Dis 2013; 4:e553. [PMID: 23519122 PMCID: PMC3615730 DOI: 10.1038/cddis.2013.69] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Vitamin B12 (cobalamin) is a key determinant of S-adenosyl methionine (SAM)-dependent epigenomic cellular regulations related to methylation/acetylation and its deficiency produces neurodegenerative disorders by elusive mechanisms. Sirtuin 1 deacetylase (SIRT1) triggers cell response to nutritional stress through endoplasmic reticulum (ER) stress. Recently, we have established a N1E115 dopaminergic cell model by stable expression of a transcobalamin–oleosin chimera (TO), which impairs cellular availability of vitamin B12, decreases methionine synthase activity and SAM level, and reduces cell proliferation. In contrast, oleosin-transcobalamin chimera (OT) does not modify the phenotype of transfected cells. Presently, the impaired cellular availability of vitamin B12 in TO cells activated irreversible ER stress pathways, with increased P-eIF-2α, P-PERK, P-IRE1α, ATF6, ATF4, decreased chaperon proteins and increased pro-apoptotic markers, CHOP and cleaved caspase 3, through reduced SIRT1 expression and consequently greater acetylation of heat-shock factor protein 1 (HSF1). Adding either B12, SIRT1, or HSF1 activators as well as overexpressing SIRT1 or HSF1 dramatically reduced the activation of ER stress pathways in TO cells. Conversely, impairing SIRT1 and HSF1 by siRNA, expressing a dominant negative form of HSF1, or adding a SIRT1 inhibitor led to B12-dependent ER stress in OT cells. Addition of B12 abolished the activation of stress transducers and apoptosis, and increased the expression of protein chaperons in OT cells subjected to thapsigargin, a strong ER stress stimulator. AdoX, an inhibitor of methyltransferase activities, produced similar effects than decreased B12 availability on SIRT1 and ER stress by a mechanism related to increased expression of hypermethylated in cancer 1 (HIC1). Taken together, these data show that cellular vitamin B12 has a strong modulating influence on ER stress in N1E115 dopaminergic cells. The impaired cellular availability in vitamin B12 induces irreversible ER stress by greater acetylation of HSF1 through decreased SIRT1 expression, whereas adding vitamin B12 produces protective effects in cells subjected to ER stress stimulation.
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Toker A, Yerlikaya FH, Yener Y, Toy H. Serum homocysteine, arginine, citrulline and asymmetric dimethyl arginine levels, and histopathologic examination of the abdominal aorta in rats exposed to acrylamide. Biotech Histochem 2012; 88:103-8. [DOI: 10.3109/10520295.2012.745950] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Joseph J, Joseph L. Hyperhomocysteinemia and cardiovascular disease: new mechanisms beyond atherosclerosis. Metab Syndr Relat Disord 2012; 1:97-104. [PMID: 18370631 DOI: 10.1089/154041903322294425] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The association of hyperhomocysteinemia (Hhe) with cardiovascular disease (CVD) has been explored in detail over the last four decades since initial reports in the 1960s. Although several epidemiological studies have shown an association, convincing mechanistic studies are still lacking. However, recent prospective studies demonstrate a strong association of Hhe with coronary disease. Several pathogenic mechanisms have been studied in Hhe and indicate alterations in the various components of vascular disease, namely endothelial cells, vascular smooth muscle cells, platelets, and the coagulation/fibrinolytic systems. Increased oxidative stress, hypomethylation, and protein homocysteinylation have been proposed as potential molecular mechanisms in Hhe-induced CVD. In addition, recent studies indicate a novel link between Hhe and CVD, that is, direct effects on coronary arteriolar and myocardial remodeling resulting in cardiac dysfunction.
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Affiliation(s)
- Jacob Joseph
- The Departments of Internal Medicine and Pharmaceutical Sciences, University of Arkansas for Medical Sciences and Central Arkansas Veterans Healthcare System, Little Rock, Arkansas
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Tehlivets O, Malanovic N, Visram M, Pavkov-Keller T, Keller W. S-adenosyl-L-homocysteine hydrolase and methylation disorders: yeast as a model system. Biochim Biophys Acta Mol Basis Dis 2012; 1832:204-15. [PMID: 23017368 PMCID: PMC3787734 DOI: 10.1016/j.bbadis.2012.09.007] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Revised: 09/14/2012] [Accepted: 09/18/2012] [Indexed: 12/14/2022]
Abstract
S-adenosyl-L-methionine (AdoMet)-dependent methylation is central to the regulation of many biological processes: more than 50 AdoMet-dependent methyltransferases methylate a broad spectrum of cellular compounds including nucleic acids, proteins and lipids. Common to all AdoMet-dependent methyltransferase reactions is the release of the strong product inhibitor S-adenosyl-L-homocysteine (AdoHcy), as a by-product of the reaction. S-adenosyl-L-homocysteine hydrolase is the only eukaryotic enzyme capable of reversible AdoHcy hydrolysis to adenosine and homocysteine and, thus, relief from AdoHcy inhibition. Impaired S-adenosyl-L-homocysteine hydrolase activity in humans results in AdoHcy accumulation and severe pathological consequences. Hyperhomocysteinemia, which is characterized by elevated levels of homocysteine in blood, also exhibits a similar phenotype of AdoHcy accumulation due to the reversal of the direction of the S-adenosyl-L-homocysteine hydrolase reaction. Inhibition of S-adenosyl-L-homocysteine hydrolase is also linked to antiviral effects. In this review the advantages of yeast as an experimental system to understand pathologies associated with AdoHcy accumulation will be discussed.
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Affiliation(s)
- Oksana Tehlivets
- Institute of Molecular Biosciences, University of Graz, Graz, Austria.
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Zhang D, Xie X, Chen Y, Hammock BD, Kong W, Zhu Y. Homocysteine upregulates soluble epoxide hydrolase in vascular endothelium in vitro and in vivo. Circ Res 2012; 110:808-17. [PMID: 22354938 PMCID: PMC3514454 DOI: 10.1161/circresaha.111.259325] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
RATIONALE Hyperhomocysteinemia is a risk factor of atherogenesis. Soluble epoxide hydrolase (sEH) is a major enzyme that hydrolyzes epoxyeicosatrienoic acids and attenuates their cardiovascular protective effects. Whether homocysteine (Hcy) regulates sEH and the underlying mechanism remains elusive. OBJECTIVE To elucidate the mechanism by which Hcy regulates sEH expression and endothelial activation in vitro and in vivo. METHODS AND RESULTS Hcy treatment in cultured human endothelial cells dose-dependently and time-dependently upregulated sEH mRNA and protein. Hcy increased the expression of adhesion molecules, which was markedly reversed by inhibiting sEH activity. Hcy-induced sEH upregulation is associated with activation of activating transcription factor-6 (ATF6). Bioinformatics analysis revealed a putative ATF6-binding motif in the promoter region of the sEH gene, which was found at a methylation site. Site-directed mutagenesis and chromatin immunoprecipitation assays demonstrated that Hcy treatment or ATF6 overexpression promoted ATF6 binding to the promoter of sEH and increased its activity. Results of methylation-specific polymerase chain reaction revealed that the ATF6 binding site on the sEH promoter was partially methylated and was demethylated with Hcy. SiRNA knockdown of ATF6α or SP1 blocked and ATF6 overexpression and DNA methyltransferase inhibitor mimicked the effect of homocysteine on sEH upregulation. In vivo, immunofluorescence assay revealed elevated expression of sEH and adhesion molecules in the aortic intima of mice with mild hyperhomocysteinemia, which was attenuated by sEH deletion or inhibition. CONCLUSION ATF6 activation and DNA demethylation may coordinately contribute to Hcy-induced sEH expression and endothelial activation. Inhibition of sEH may be a therapeutic approach for treating Hcy-induced cardiovascular diseases.
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MESH Headings
- 8,11,14-Eicosatrienoic Acid/analogs & derivatives
- 8,11,14-Eicosatrienoic Acid/antagonists & inhibitors
- 8,11,14-Eicosatrienoic Acid/metabolism
- Activating Transcription Factor 6/genetics
- Activating Transcription Factor 6/metabolism
- Animals
- Aorta/cytology
- Base Sequence
- DNA Methylation/physiology
- Endothelial Cells/cytology
- Endothelial Cells/enzymology
- Epoxide Hydrolases/antagonists & inhibitors
- Epoxide Hydrolases/genetics
- Epoxide Hydrolases/metabolism
- Gene Expression Regulation, Enzymologic/drug effects
- Gene Expression Regulation, Enzymologic/physiology
- Homocysteine/metabolism
- Homocysteine/pharmacology
- Human Umbilical Vein Endothelial Cells
- Humans
- Hyperhomocysteinemia/metabolism
- Hyperhomocysteinemia/pathology
- Mice
- Mice, Inbred C57BL
- Mice, Mutant Strains
- Promoter Regions, Genetic/physiology
- Pyrenes/pharmacology
- RNA, Small Interfering/pharmacology
- Solubility
- Up-Regulation/drug effects
- Up-Regulation/physiology
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Affiliation(s)
- Donghong Zhang
- Cardiovascular Research Center, Shantou University Medical College, Shantou, Guangdong, 515041, China
| | - Xina Xie
- Cardiovascular Research Center, Shantou University Medical College, Shantou, Guangdong, 515041, China
| | - Yequn Chen
- Cardiovascular Research Center, Shantou University Medical College, Shantou, Guangdong, 515041, China
| | - Bruce D. Hammock
- Department of Entomology and Cancer Center, University of California at Davis, Davis, CA 95616, USA
| | - Wei Kong
- Department of Physiology and Pathophysiology; Key Laboratory of Molecular Cardiovascular Sciences of Education Ministry, Peking University Health Sciences Center, Beijing, 100191, China
| | - Yi Zhu
- Cardiovascular Research Center, Shantou University Medical College, Shantou, Guangdong, 515041, China
- Department of Physiology and Pathophysiology; Key Laboratory of Molecular Cardiovascular Sciences of Education Ministry, Peking University Health Sciences Center, Beijing, 100191, China
- Corresponding author: Yi Zhu, MD, Department of Physiology and Pathophysiology, Peking University Health Sciences Center, 38 Xue Yuan, Road, Hai Dian District, Beijing, 100191, China, Tel.: (8610) 8280-1440, Fax: (8610) 8282-1440,
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Siqueira ERF, Oliveira CPMS, Muniz MTC, Silva F, Pereira LMMB, Carrilho FJ. Methylenetetrahydrofolate reductase (MTHFR) C677T polymorphism and high plasma homocysteine in chronic hepatitis C (CHC) infected patients from the Northeast of Brazil. Nutr J 2011; 10:86. [PMID: 21854603 PMCID: PMC3170250 DOI: 10.1186/1475-2891-10-86] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2011] [Accepted: 08/19/2011] [Indexed: 01/29/2023] Open
Abstract
BACKGROUND/AIM Hyperhomocysteinemia due to Methylenetetrahydrofolate Reductase (MTHFR) gene, in particular the C677T (Ala222Val) polymorphism were recently associated to steatosis and fibrosis. We analyzed the frequency of MTHFR gene in a cross-sectional study of patients affected by Chronic Hepatitis C (CHC) from Northeast of Brazil. METHOD One hundred seven-four untreated patients with CHC were genotyped for the C677T MTHFR. Genomic DNA was extracted from peripheral blood cells and the C677T MTHFR polymorphism was identified by PCR-RFLP. The homocysteine (Hcy) levels were determined by chemiluminescence method. All patients were negative for markers of Wilson's disease, hemochromatosis and autoimmune diseases and have current and past daily alcohol intake less than 100 g/week. RESULTS Among subjects infected with CHC genotype non-1 the frequency of MTHFR genotypes TT was 9.8% versus 4.4% genotype 1 (p = 0.01). Nevertheless, association was found between the MTHFR genotype TT × CT/CC polymorphism and the degree of steatosis and fibrosis in both hepatitis C genotype (p < 0.05). A significant difference was found on plasma Hcy levels in patients with steatosis regardless of HCV genotype (p = 0.03). CONCLUSION Our results indicate that plasma Hcy levels is highly prevalent in subjects with chronic hepatits C with steatosis regardless of HCV genotype and vitamin deficiency. The presence of genotype TT of MTHFR C677T polymorphism was more common in CHC genotype non-1 infected patient regardless of histopathological classification and genotype TT+CT frequencies were significant in the presence of fibrosis grade 1+2 and of steatosis in CHC infected patients from the northeast of Brazil regardless of HCV genotype. The genetic susceptibility of MTHFR C677T polymorphism should be confirmed in a large population.
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Affiliation(s)
- Erika RF Siqueira
- Department of Gastroenterology LIM-07, University of Sao Paulo School of Medicine, Avenue Dr Arnaldo, 455, Sao Paulo, 01246903, Brazil
- Department of Gastroenterology, University of Pernambuco School of Medicine, Avenue Agamenon Magalhães, Pernambuco, 50.100-010, Brazil
- Liver Institute of Pernambuco, Arnóbio Marques Street, 282, Pernambuco,50.100-130, Pernambuco, Brazil
| | - Cláudia PMS Oliveira
- Department of Gastroenterology LIM-07, University of Sao Paulo School of Medicine, Avenue Dr Arnaldo, 455, Sao Paulo, 01246903, Brazil
| | - Maria TC Muniz
- Departments of Biochemistry, University of Pernambuco School of Medicine, Avenue Agamenon Magalhães, Pernambuco, 50.100-010, Brazil
| | - Filipe Silva
- Departments of Biochemistry, University of Pernambuco School of Medicine, Avenue Agamenon Magalhães, Pernambuco, 50.100-010, Brazil
| | - Leila MMB Pereira
- Department of Gastroenterology, University of Pernambuco School of Medicine, Avenue Agamenon Magalhães, Pernambuco, 50.100-010, Brazil
- Liver Institute of Pernambuco, Arnóbio Marques Street, 282, Pernambuco,50.100-130, Pernambuco, Brazil
| | - Flair J Carrilho
- Department of Gastroenterology LIM-07, University of Sao Paulo School of Medicine, Avenue Dr Arnaldo, 455, Sao Paulo, 01246903, Brazil
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Homocysteine as a risk factor for atherosclerosis: is its conversion to s-adenosyl-L-homocysteine the key to deregulated lipid metabolism? J Lipids 2011; 2011:702853. [PMID: 21837278 PMCID: PMC3151505 DOI: 10.1155/2011/702853] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Accepted: 06/04/2011] [Indexed: 11/17/2022] Open
Abstract
Homocysteine (Hcy) has been recognized for the past five decades as a risk factor for atherosclerosis. However, the role of Hcy in the pathological changes associated with atherosclerosis as well as the pathological mechanisms triggered by Hcy accumulation is
poorly understood. Due to the reversal of the physiological direction of the reaction catalyzed by S-adenosyl-L-homocysteine
hydrolase Hcy accumulation leads to the synthesis of S-adenosyl-L-homocysteine (AdoHcy). AdoHcy is a strong product
inhibitor of S-adenosyl-L-methionine (AdoMet)-dependent methyltransferases, and to date more than 50 AdoMet-dependent
methyltransferases that methylate a broad spectrum of cellular compounds including nucleic acids, proteins and lipids have been
identified. Phospholipid methylation is the major consumer of AdoMet, both in mammals and in yeast. AdoHcy accumulation induced
either by Hcy supplementation or due to S-adenosyl-L-homocysteine hydrolase deficiency results in inhibition of phospholipid
methylation in yeast. Moreover, yeast cells accumulating AdoHcy also massively accumulate triacylglycerols (TAG). Similarly, Hcy
supplementation was shown to lead to increased TAG and sterol synthesis as well as to the induction of the unfolded protein
response (UPR) in mammalian cells. In this review a model of deregulation of lipid metabolism in response to accumulation of
AdoHcy in Hcy-associated pathology is proposed.
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Alirezaei M, Jelodar G, Niknam P, Ghayemi Z, Nazifi S. Betaine prevents ethanol-induced oxidative stress and reduces total homocysteine in the rat cerebellum. J Physiol Biochem 2011; 67:605-12. [PMID: 21698419 DOI: 10.1007/s13105-011-0107-1] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Accepted: 06/09/2011] [Indexed: 01/10/2023]
Abstract
Oxidative stress is a hypothesis for the association of reactive oxygen species with cerebrovascular and neurodegenerative diseases. Thus, we examined whether oral betaine can act as a preventive agent in ethanol-induced oxidative stress on the cerebellum of rats. Thirty-two adult male Sprague-Dawley rats were divided into four equal groups (control, ethanol, betaine, and betaine plus ethanol) with different dietary regimens and were followed up for 1 month. Total homocysteine (tHcy) of plasma and cerebellum homogenate was determined by an Axis(®) homocysteine EIA kit, and antioxidant enzyme (glutathione peroxidase (GPx), SOD, and CAT) activities of cerebellum homogenate were measured chemically by a spectrophotometer. Lipid peroxidation of cerebellum was shown by the measurement of thiobarbituric reactive substances (TBARS) via a spectrophotometer. Ethanol-induced hyperhomocysteinemia was manifested by an increase in the concentrations of tHcy in the plasma and cerebellum homogenates of the ethanol group, while ethanol-induced oxidative stress was indicated via an increase in lipid peroxidation marker (TBARS) in cerebellum homogenates of ethanol-treated rats. In contrast, betaine prevented hyperhomocysteinemia and oxidative stress in the betaine plus ethanol group as well as the betaine group. The results of the present investigation indicated that the protective effect of betaine is probably related to its ability to strengthen the cerebellum membrane cells by enhancement of antioxidant enzyme activity principally GPx, while the methyl donor effect of betaine to reduce hyperhomocysteinemia has been explained previously and confirmed in the present study.
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Affiliation(s)
- Masoud Alirezaei
- Division of Biochemistry, School of Veterinary Medicine, Lorestan University, P. O. Box 465, Khorram Abad, Iran.
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Namazi MR, Feily A. Homocysteine may accelerate skin aging: A new chapter in the biology of skin senescence? J Am Acad Dermatol 2011; 64:1175-8. [DOI: 10.1016/j.jaad.2010.04.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2009] [Revised: 04/05/2010] [Accepted: 04/07/2010] [Indexed: 11/16/2022]
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Kumar A, John L, Maity S, Manchanda M, Sharma A, Saini N, Chakraborty K, Sengupta S. Converging evidence of mitochondrial dysfunction in a yeast model of homocysteine metabolism imbalance. J Biol Chem 2011; 286:21779-95. [PMID: 21504896 DOI: 10.1074/jbc.m111.228072] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
An elevated level of homocysteine, a thiol amino acid, is associated with various complex disorders. The cellular effects of homocysteine and its precursors S-adenosylhomocysteine (AdoHcy) and S-adenosylmethionine (AdoMet) are, however, poorly understood. We used Saccharomyces cerevisiae as a model to understand the basis of pathogenicity induced by homocysteine and its precursors. Both homocysteine and AdoHcy but not AdoMet inhibited the growth of the str4Δ strain (which lacks the enzyme that converts homocysteine to cystathionine-mimicking vascular cells). Addition of AdoMet abrogated the inhibitory effect of AdoHcy but not that of homocysteine indicating that an increase in the AdoMet/AdoHcy ratio is sufficient to overcome the AdoHcy-mediated growth defect but not that of homocysteine. Also, the transcriptomic profile of AdoHcy and homocysteine showed gross dissimilarity based on gene enrichment analysis. Furthermore, compared with homocysteine, AdoHcy treatment caused a higher level of oxidative stress in the cells. However, unlike a previously reported response in wild type (Kumar, A., John, L., Alam, M. M., Gupta, A., Sharma, G., Pillai, B., and Sengupta, S. (2006) Biochem. J. 396, 61-69), the str4Δ strain did not exhibit an endoplasmic reticulum stress response. This suggests that homocysteine induces varied response depending on the flux of homocysteine metabolism. We also observed altered expression of mitochondrial genes, defective membrane potential, and fragmentation of the mitochondrial network together with the increased expression of fission genes indicating that the imbalance in homocysteine metabolism has a major effect on mitochondrial functions. Furthermore, treatment of cells with homocysteine or AdoHcy resulted in apoptosis as revealed by annexin V staining and TUNEL assay. Cumulatively, our results suggest that elevated levels of homocysteine lead to mitochondrial dysfunction, which could potentially initiate pro-apoptotic pathways, and this could be one of the mechanisms underlying homocysteine-induced pathogenicity.
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Affiliation(s)
- Arun Kumar
- Institute of Genomics and Integrative Biology, Council of Scientific and Industrial Research, Mall Road, Delhi-110007, India
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