|
 
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| REVIEW ARTICLE |
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| Year : 2019 | Volume
: 10
| Issue : 1 | Page : 86 |
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Oxidative stress and polycystic ovary syndrome: A brief review
Masoumeh Mohammadi
Cellular and Molecular Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| Date of Submission | 02-Jan-2018 |
| Date of Acceptance | 03-Dec-2018 |
| Date of Web Publication | 17-May-2019 |
Correspondence Address:
Masoumeh Mohammadi
Cellular and Molecular Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences, Tehran
Iran
 Source of Support: None, Conflict of Interest: None  | Check |
DOI: 10.4103/ijpvm.IJPVM_576_17
Polycystic ovary syndrome (PCOS) is one of the most common hormonal disorders, occurring in 5–10% women in reproductive ages. Despite a long history of studies on PCOS, its etiology is still unknown. Oxidative stress is now recognized to play a central role in the pathophysiology of many different disorders, including PCOS. Although intracellular reactive oxygen species (ROS) production and propagation are controlled by highly complex antioxidant enzymatic and non-enzymatic systems, understanding of mechanisms that oxidative stress is important to develop strategies for prevention and therapy of PCOS. This article reviews the literature data related to the mechanisms of oxidative stress in PCOS.
Keywords: Antioxidant, oxidative marker, oxidative stress, polycystic ovary syndrome, reactive oxygen species
How to cite this article:
Mohammadi M. Oxidative stress and polycystic ovary syndrome: A brief review. Int J Prev Med 2019;10:86 |
| Introduction | |  |
Polycystic ovary syndrome (PCOS) is a public health important disease, affecting at reproductive age and associated with reproductive, metabolic, and psychological dysfunction. PCOS women commonly have features of hyperandrogenism and hirsutism, oligo or amenorrhea, and unovulation. Despite a long history of studies on PCOS, its etiology is still unknown about the pathophysiology of PCOS, have explained the roles of inflammatory state, endothelial injury, oxidative stress, and genetic mechanisms.[1],[2],[3]
Oxidative stress is referred as the imbalance between oxidants and antioxidants and the generation of excessive amounts of reactive oxygen species (ROS). A lot of investigations have revealed that oxidative circulating markers are significantly increased in patients with PCOS compared with the normal and are considered as a potential inducement of PCOS pathogenesis.[1]
Oxidative stress is now recognized to play a central role in the pathophysiology of many different disorders, including PCOS. The present review study provides an overview of current knowledge about important oxidative stress roles in the pathogenesis of PCOS.
| Methods and Literature Search Strategy | | |
An electronic literature search of databases including PubMed, Medline, Web of sciences, Embase, and Scopus was conducted for publications, in English, up to 2018. The search terms included “Polycystic ovary syndrome,” “PCOS,” “Reactive oxygen species (ROS),” “Oxidative marker,” “Oxidative stress (OS),” “Antioxidant,” “Malondialdehyde (MDA),” “Nitric oxide (NO),” “Advanced glycosylated end products (AGEs),” “Xanthine oxidase (XO),” “Superoxide dismutase (SOD),” “Glutathione peroxidase (GPx),” “Total antioxidant capacity (TAC),” “Vitamin E,” and “Vitamin C,” or their equivalents were used individually or/and in various combinations to retrieve the relevant literatures. In addition, the reference lists of all identified literature were also checked to identify additional relevant articles.
Overview of oxidative stress
Oxidative stress as a general term usually used to describe an imbalance between the production of free radicals and the ability of the body to defense their harmful effects by antioxidants that cause DNA damage and/or cell apoptosis. Disturbances in the normal oxidation reaction of cells and the production of free radicals and peroxides can cause toxic effects that damage the cell. The effects of oxidative stress depend on the percentage of these changes from DNA damage and trigger apoptosis and necrosis to cell death.[4]
ROS represent a class of molecules that is derived from the metabolism of oxygen in aerobic organisms. The major ROS with physiological function are superoxide anion (O2−), hydroxyl radical (OH), hydrogen peroxide (H2O2), organic hydroperoxide (ROOH), alkoxy and peroxy radicals (RO and ROO), hypochlorous acid (HOCl), and peroxynitrite (ONOO-). ROS can act as second messengers in mammalian cells to regulate signal transduction pathways that lead to control gene expression and proteins post-translational changes, involved in cell function, growth, differentiation, and death.[5],[6]
There are several sources that generate the ROS. One source of reactive oxygen under normal conditions in humans is the leakage of activated oxygen from mitochondria during oxidative phosphorylation.[7] Other endogenous source of ROS is the leakage of activated oxygen from the detoxification reactions involving the liver cytochrome P-450 enzyme system,[8] peroxisomal oxidases,[9] NAD (P) H oxidases,[10] or XO.[11],[12] Exogenous sources include exposure to environmental pollutants; cigarette smoke; consumption of alcohol; exposure to ionizing radiation; and bacterial, fungal, viral infections, etc.[13]
In return, there are molecules in the cells that prevent these reactions by donating an electron to the free radicals without becoming destabilized with the name of antioxidant. In fact, cellular ROS productions are controlled by highly complex antioxidant enzymatic and non-enzymatic systems. The important antioxidant enzymes such as SOD, catalase (CAT), GPx glutathione S-reductase (GSR), Glucose-6-phosphate dehydrogenase (G6PD), and isocitrate dehydrogenase (ICDH) are compartmentalized within the cell by defenses against ROS propagation, oxidative stress, and tissue damage.[14] Non-enzymatic antioxidant systems, system that contains vitamins such as E, C, and A are among the major dietary antioxidants that directly neutralize ROS, provide a major source of protection against the side effects of ROS.[15],[16] Trace elements act as cofactors in the regulation of antioxidant enzymes specially Cu, Zn, Mn, and Se are essential constituents of enzymatic antioxidant systems such as Cu-Zn-SOD (SOD1), Mn-SOD (SOD2), and Se-GPx.[14] Polyphenols and ubiquitous, as natural antioxidants, are in diet specially in vegetables and fruits.[17]
Reactive oxygen species diverse actions on cell function
- Activation of redox-sensitive transcription factors: Redox-sensitive transcription factors such as AP-1, p53, and NF-κB regulate the expression of pro-inflammatory and other cytokines, cell differentiation, and apoptosis. PCOS is associated with low-grade inflammation and raised inflammatory cytokines, which contribute to the pathogenesis of this syndrome. The majority of studies addressing the status of chronic low-grade inflammation in PCOS has focused on the measurement of circulating C-reactive protein (CRP), TNFα, IL-6, and IL-18[18],[19]
Activation of protein kinases: In fact, with activation of protein kinases, cells respond to a variety of extracellular signals and stress that may lead to more extensive cell damage, resulting ultimately in cell death through necrosis or apoptosis.[20] ROS influence the mitogen activated protein kinase signaling pathways that are involved in diverse physiological processes [21] because these pathways are major regulators of gene transcription in response to oxidative stress by promoting the actions of receptor tyrosine kinases, protein tyrosine kinases, receptors of cytokines, and growth factors.[22],[23] About pathogenesis of insulin resistance in PCOS patient, several studies indicated that with the increased oxidative stress, various protein kinases are activated to induce serine/threonine phosphorylation of, insulin receptor substrate (IRS), inhibit normal tyrosine phosphorylation of IRS, and finally, induce the degradation of IRS.[24],[25] Other pathways that can be activated by ROS include the c-Jun N-terminal kinases (JNK) and p38 pathways. JNK is a component of the transcription factor activator protein-1 (AP-1). AP-1 regulates the transcription of numerous genes such as cytokines, growth factors, inflammatory enzymes, matrix metalloproteinase, and immunoglobulins
- Opening of ion channels: Increase of ROS lead to release of Ca2+ ions from the endoplasmic reticulum and other stores and loss of intracellular Ca2+ homeostasis. Excess the cytosolic Ca2+ ion concentration will adversely affect such as instability in the mitochondrial membrane and also collapse of adenosine triphosphate (ATP) synthesis, finally the cell undergoes primary necrosis.[26],[27] In PCOS women, studies showed calcium dysregulation contributes to the development of follicular arrest, resulting in reproductive and menstrual dysfunction [28]
- Protein oxidation: Amino acids, both in proteins and free, are a target for oxidative damage. Direct oxidation of the side chains leads to the formation of carbonyl products.[29] Carbonyl products lead to a loss of protein function, which is considered an indicator of oxidative damage and disease-derived protein dysfunction.[30] Plasma advanced oxidation protein products (AOPPs) in serum of PCOS patients had significantly higher than control women. AOPPs have been considered as novel markers of oxidant-mediated protein damage and may also act as a novel class of pro-inflammatory mediators [31]
- Lipid peroxidation: Lipid peroxidation is occurring in the polyunsaturated fatty acid side chains of the plasma membrane or that of any organelle that contains lipid. These fatty acid side chains react with O2 and create the peroxyl radical, which can obtain H+ from another fatty acid, creating a continuous reaction.[32] These chain reactions with vitamin E can break and act as an antioxidant because vitamin E has lipid solubility and hydrophobic tail.[27] Levels of markers that could reflect the degrees of lipid peroxidation, such as thiobarbituric acid-reactive substances, oxidized low-density lipoprotein, and malondialdehyde (MDA) increase significantly in the PCOS patients compared with the normal. In addition, serum lipid peroxide concentrations were increased in patients with PCOS [33],[34]
- DNA oxidation: It occurs at guanine residues because of the higher oxidation potential of this base than cytosine, thymine, and adenine. Mitochondrial DNA is particularly vulnerable to ROS attack owing to O 2 − generation from the electron transport chain, lack of histone protection, and absence or minimal repair mechanisms that exist.[35] Free radical mediated DNA damage and impaired antioxidant defense have been implicated as contributory factors for the development of cancer. Dinqer et al. evaluated H2O2-induced DNA damage, a marker of DNA susceptibility to oxidation in PCOS women. They showed a significant increase in DNA strand breakage and H2O2-induced DNA damage that may explain the association between PCOS and ovarian cancer.[36]
Oxidative stress biomarkers in PCOS
For investigation of the oxidative stress role in the pathogenesis of diseases, mainly, we have examined oxidative stress biomarkers including MDA and NO also anti-oxidative biomarkers such as TAC, SOD, GPx, and glutathione (GSH). The evaluation of oxidative stress and antioxidant biomarkers have been suggested as useful tools in estimating the risk of oxidative damage and associated diseases [37],[38] and help in the prevention and management of oxidative diseases. A number of oxidative stress markers in PCOS are listed in [Table 1]. These biomarkers in PCOS reported in several studies as follows: | Table 1: Oxidative stress markers in polycystic ovary syndrome (PCOS) patients
Click here to view |
Malondialdehyde
MDA results from lipid peroxidation of polyunsaturated fatty acids [39] is stable and can serve as a good biomarker.[32] MDA level in PCOS reported in several studies. One meta-analysis showed that circulating mean MDA concentrations according to the age and BMI were increased 47% in women with PCOS compared with controls.[1]
Kuscu et al. compared blood MDA level in PCOS patients with healthy controls. They showed the MDA level was significantly higher in the PCOS group but was independent of obesity.[40] In another study, Zhang et al. demonstrated that serum MDA levels in PCOS patients were significantly higher than the control group, but BMI and age were not recorded.[41] In addition, Dursun et al. studied PCOS patients and found serum MDA levels in PCOS patients were similar to those of BMI and smoking status matched controls.[42]
Palacio et al. compared PCOS patients with BMI and age matched controls. They demonstrated that higher levels of erythrocyte MDA were seen in PCOS patients compared with controls. These results also were found by Sabuncu et al.[43],[44]
Nitric oxide
NO is a free radical, and it is an important cellular signaling molecule involved in many physiological and pathological processes, but an excess of NO can be toxic. NO endogenously is biosynthesized by various nitric oxide synthase (NOS) enzymes from L-arginine, oxygen, and nicotinamide adenine dinucleotide phosphate. An alternative pathway, NO synthesis through the sequential reduction of nitrate derived from plant based foods.[45] It is also generated in immune responses through phagocytes by monocytes, macrophages, and neutrophils. NO level in PCOS reported in several studies. Recent meta-analysis study showed that the mean of the NO level had no statistically significant difference in women with PCOS compared with controls.[1]
Hassani et al. to evaluate the role of NO in PCOS, Wistar rats treated with L-Arginine, a precursor of NO, and results showed that the ovaries of rats treated with L-arginine had polycystic characteristics in contrast to control and believed that NO may play a major role in the pathophysiology of PCOS.[46]
Karabulut et al. investigated relation between PCOS and oxidative stress status by measuring NO in PCOS patients and healthy control. Results showed that statistically higher levels of NO in PCOS patients compared to the control women.[47]
Willis et al. compared measures of oxidative stress and NO metabolites in patients with PCOS and age/BMI matched control. Results showed similar nitrite but lower nitrate levels in subjects with PCOS (Nitrite/nitrate concentration is an index of endothelium-derived NO).[48] In addition, Nacul et al. reported that NO levels in PCOS patients were similar in age/BMI matched controls. They investigated NO and fibrinogen levels are as two markers of vascular disease that are associated with insulin resistance in PCOS women and showed a significant negative correlation between NO and fasting insulin levels and homeostatic model assessment. They suggested that NO was related to the presence of insulin resistance in PCOS patients.[49]
Advanced glycation end products
AGEs also called “glycotoxins,” are the end products of a chemical procedure called the Maillard reaction in which the carbonyl group of carbohydrates reacts non-enzymatically and interacts with lipids or with amino groups of proteins.[50]
ROS catalyze the chemical modification of proteins by Maillard reactions in vivo.[51] AGEs, end product of this reaction, in turn, induce oxidative stress, finally leading to inflammation and the propagation of tissue damage. Thus, the production of AGEs and resultant oxidative stress accelerate Maillard reactions and can initiate an autocatalytic cycle of deleterious reactions in tissues.[52]
AGEs level as oxidative stress marker of PCOS reported in several studies and accumulating evidence has suggested the possibility of AGEs in altering steroid bio-synthesis in polycystic ovaries by affecting enzyme function, induction of inflammatory changes, and insulin resistance.[53] The result of abnormal steroidogenesis in PCOS could lead to elevated androgen synthesis and abnormal folliculogenesis.[54]
Diamanti-Kandarakis et al. investigated serum AGEs levels and receptor for AGEs (RAGE) expression in monocytes of PCOS and control group and their correlation with testosterone levels. They demonstrated higher serum AGEs protein levels and RAGE in patients with PCOS compared to control group. In addition, a positive correlation was observed between serum AGEs and testosterone levels, even after controlling for BMI.[55] In another study, the same authors fed Wistar rats diet containing high (H) or low (L) AGEs for 6 months. In H-AGE rats, they found elevated AGE deposition in ovarian theca interna cells, increased RAGE staining in granulosa cells, and higher plasma testosterone compared to L-AGE rats.[56] In addition, Tantalaki et al. investigated the role of AGE dietary intake on hormonal status of women with PCOS. They gave women with PCOS isocaloric diet containing high AGE or low AGE for 2 months and found higher serum AGE along with elevated testosterone, free androgen index, and androstendione levels in PCOS patients with the H-AGE diet compared to L-AGE diet.[57] These studies substantiate the association between AGE and hyperandrogenism in PCOS.
Xanthine oxidase
XO is an enzyme that participates in the generation of superoxide anion radicals.
This enzyme catalyzes the oxidation of hypoxanthine to xanthine and oxidation of xanthine to uric acid.[58] Serum XO, which plays an important role in the catabolism of purines in humans and generates ROS, was increased in PCOS in studies.[59] In addition HaticeIsık et al. investigated serum XO and SOD activities, hormonal levels, cholesterol levels, fasting plasma glucose (FPG), fasting plasma insulin (FPI), quantitative insulin sensitivity check index (QUICKI), homeostatic model assessment-insulin resistance (HOMA-IR) index, CRP, white blood cell, and neutrophil counts. The basal hormone levels, triglyceride (TG) levels, TG/high density lipoprotein-cholesterol (HDL-C) ratios, FPG, FPI, and HOMA-IR levels were higher in PCOS patients compared to controls. However, CRP, platelet and plateletcrit (PCT) values, and XO activity were significantly increased, and SOD activity was decreased in PCOS patients. The XO activity was positively correlated with CRP, PCT, FPG, FPI, LH/FSH, TG/HDL ratios, and HOMA-IR, and negatively correlated with QUICKI levels. They suggested that the XO is a useful marker to assess oxidative stress in PCOS patients.[60]
Total antioxidant capacity
TAC is the ability of serum to scavenge free radical production. TAC level in PCOS reported in several studies. One meta-analysis showed that there was no significant difference in TAC in women with PCOS compared with controls.[1] Fenkci et al. investigated TAC level in PCOS patients compared with the age, BMI, and smoking status matched controls. They demonstrated that the TAC level was significantly lower in PCOS patients.[61]
However, Verit et al. reported that TAC levels were significantly higher in PCOS patients compared with age and BMI matched controls. Although the complete mechanism of this elevation is unknown, they proposed that TAC was increased to restitution of oxidative stress elevation.[62]
Results of studies about antioxidant concentration are conflicting; therefore, further studies of oxidative stress in PCOS are needed to clarify the association PCOS with antioxidants. A number of antioxidative stress markers in PCOS are listed in [Table 2]. | Table 2: Antioxidative stress markers in polycystic ovary syndrome (PCOS) patients
Click here to view |
Superoxide dismutase
SOD is an enzyme and an important antioxidant defense that eliminates superoxide anions (O2-), as a major oxygen radical, by catalyzes of them to H2O2 and final by GPx converted to water.[6] Several common forms of SOD exist depending on the metal cofactor and the protein fold such as the Cu/Zn type, Fe and Mn types, and the Ni type.[63]
SOD activity in PCOS reported in several studies. Sabuncu et al. determined antioxidant status in women with PCOS evaluated blood SOD level in PCOS patients compared with healthy controls. They showed that women with PCOS had higher SOD levels than normal subjects.[44] Moreover, Zhang et al. showed that the serum SOD level in PCOS patients was significantly lower than the control group.[41]
Kuscu et al. determined the oxidative stress role in endothelial dysfunction in a young, non-obese group of PCOS patients, measured blood SOD level. They demonstrated that SOD levels were significantly higher in a PCOS group than in control group.[40] In 2013, the result of one meta-analysis also showed that the mean SOD activity was 34% higher in PCOS patients than in controls.[1]
In another study, Seleem et al. examined the activity of SOD both in the serum and follicular fluid (FF) from women with PCOS undergoing intra cytoplasmic sperm injection. They showed SOD activity highly significant decrease both in the mean serum and FF, in PCOS than the control group, and suggested serum SOD activity could be a clinical parameter for determining systemic oxidative stress in PCOS.[64] Further studies are needed to examine the mechanism of SOD as the antioxidant defense in PCOS.
Glutathione peroxidase
GPx is an enzyme family that protects the organism from oxidative damage by reducing lipid hydroperoxides to their corresponding alcohols and reduce H2O2 to water. The GPx activity evaluation for anti-oxidant defense assessment in PCOS was reported in several studies. Sabuncu et al. determined oxidant and antioxidant status in women with PCOS. They demonstrated that GPx did not differ between a PCOS group and a healthy control group.[44]
Baskol et al. investigated relation between oxidative stress and the antioxidant system in the development of PCOS by measuring GPx activity in PCOS patients and age and sex matched healthy control. Results showed that no significant difference was found between GPx activities in PCOS patients and the control women.[59] One meta-analysis showed that the mean GPx activity had no statistically significant difference in women with PCOS compared with controls.[1] However, Savic-Radojevic et al. showed that GPx activity of PCOS women significantly decreases compared to control.[65] Further studies are needed to examine the mechanism of GPx as the antioxidant defense in PCOS.
Reduced glutathione
GSH, as an important antioxidant, is synthesized in the cytosol in two steps that require ATP. First, glutamate and cysteine by γ-glutamylcysteine synthetase create γ-glutamylcysteine and second, γ-glutamylcysteine and glycine by the activity of GSH synthetase create GSH that is distributed in the endoplasmic reticulum, nucleus, and mitochondria.[66]
GSH is essential in the regulation of the disulfide bonds of proteins and in the disposal of electrophiles and oxidants.[67] The antioxidant function of GSH is mediated by this redox-active thiol group that becomes oxidized when GSH reduces target molecules.
GSH evaluation for its antioxidant effect in PCOS was reported in several studies. One meta-analysis showed that the mean GSH levels were 50% lower in women with PCOS than in controls.[1] Sabuncu et al. demonstrated that GSH was significantly lower in the PCOS patient group than in the control group.[44] In accordance with the findings of Sabuncu et al., Dincer et al. also found GSH levels to be significantly lower in women with PCOS than in the control group. They proposed that GSH depletion might have resulted from increased production of ROS in PCOS patients.[36]
Vitamin C and E
Several vitamins with antioxidant capacities derived from their scavenging of oxidant molecules have been studied in PCOS. Studies on vitamin C show that this vitamin concentrations are lower in PCOS patients than in controls. Kurdoglu et al. reported vitamin C concentrations in serum and Mohan and Vishnu reported in erythrocyte are lower in PCOS patients and the same applies to circulating vitamin E concentrations.[68],[69]
| Conclusion | | |
The association between oxidative stress and PCOS is an important issue in animal and human reproductive medicine. In this review, we have summarized the current knowledge in the relationship between oxidative stress and PCOS and encompass the most important oxidative stress roles in the pathogenesis of PCOS.
Cumulative studies to date yield an association between oxidative stress and PCOS. Moreover, oxidant and antioxidant status varied between individuals because of differences in diet, lifestyle, and enzymatic and dietary antioxidants.
The measurement of multiple biomarkers of oxidant and antioxidant may be liable indicator of oxidative stress. Further studies are needed to standardize measurement units of each biomarker to facilitate comparison across studies and also examine the mechanism of oxidative stress on PCOS.
Acknowledgments
This study was supported by Cellular and Molecular Endocrine Research Center, Research Institute for Endocrine Sciences, Shahid Beheshti University of Medical Sciences. We are grateful to all individuals who participated in this project.
Financial support and sponsorship
Nil.
Conflicts of interest
There are no conflicts of interest.
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Diet, Nutritional Supplements, and Botanical Medicine in Polycystic Ovary Syndrome |
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| Khara Lucius | | Alternative and Complementary Therapies. 2021; 27(6): 289 | | [Pubmed] | [DOI] | | | 65 |
Berberine Improves the Symptoms of DHEA-Induced PCOS Rats by Regulating Gut Microbiotas and Metabolites |
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| Hao-Ran Shen, Xiao Xu, Dan Ye, Xue-Lian Li | | Gynecologic and Obstetric Investigation. 2021; 86(4): 388 | | [Pubmed] | [DOI] | | | 66 |
Ovariectomy Improves Metabolic and Oxidative Stress Marker Disruption in Androgenized Rats: Possible Approach to Postmenopausal Polycystic Ovary Syndrome |
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| Lady Katerine Serrano Mujica,Carolina S. Stein,Ligia Gomes Miyazato,Fernanda Valente,Melissa Orlandin Premaor,Alfredo Quites Antoniazzi,Rafael Noal Moresco,Fabio Vasconcellos Comim | | Metabolic Syndrome and Related Disorders. 2021; | | [Pubmed] | [DOI] | | | 67 |
Female Fertility and the Nutritional Approach: The Most Essential Aspects |
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| Kinga Skoracka,Alicja Ewa Ratajczak,Anna Maria Rychter,Agnieszka Dobrowolska,Iwona Krela-Kazmierczak | | Advances in Nutrition. 2021; | | [Pubmed] | [DOI] | | | 68 |
Effect of Acupuncture on Polycystic Ovary Syndrome in Animal Models: A Systematic Review |
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| Yan Li,Lijia Zhang,Jinjin Gao,Jun Yan,Xue Feng,Xiting He,Hong Jin,Xinyu Li,Zhengyi Cui,Junfei Zhao,Fengyi Liu,Xiaowai Liu,Yongfei Liu,Wan Ren,Songjiang Liu,Yong Wang | | Evidence-Based Complementary and Alternative Medicine. 2021; 2021: 1 | | [Pubmed] | [DOI] | | | 69 |
Association of Prx4, Total Oxidant Status, and Inflammatory Factors with Insulin Resistance in Polycystic Ovary Syndrome |
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| Sahar Mazloomi,Nasrin Sheikh,Marzieh Sanoee Farimani,Shamim Pilehvari,Raffaele Pezzani | | International Journal of Endocrinology. 2021; 2021: 1 | | [Pubmed] | [DOI] | | | 70 |
Antioxidant status in relation to heavy metals induced oxidative stress in patients with polycystic ovarian syndrome (PCOS) |
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| Manal Abudawood, Hajera Tabassum, Atheer H. Alanazi, Fatmah Almusallam, Feda Aljaser, Mir Naiman Ali, Naif D. Alenzi, Samyah T. Alanazi, Manal A. Alghamdi, Ghadah H. Altoum, Manar A. Alzeer, Majed O. Alotaibi, Arwa Abudawood, Hazem K. Ghneim, Lulu Abdullah Ali Al-Nuaim | | Scientific Reports. 2021; 11(1) | | [Pubmed] | [DOI] | | | 71 |
Randomized double blind clinical trial evaluating the Ellagic acid effects on insulin resistance, oxidative stress and sex hormones levels in women with polycystic ovarian syndrome |
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| Mahnaz Kazemi,Fatemeh Lalooha,Mohammadreza Rashidi Nooshabadi,Fariba Dashti,Maria Kavianpour,Hossein Khadem Haghighian | | Journal of Ovarian Research. 2021; 14(1) | | [Pubmed] | [DOI] | | | 72 |
Mechanistic and therapeutic insight into the effects of cinnamon in polycystic ovary syndrome: a systematic review |
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| Vahid Maleki,Amir Hossein Faghfouri,Fatemeh Pourteymour Fard Tabrizi,Jalal Moludi,Sevda Saleh-Ghadimi,Hamed Jafari-Vayghan,Shaimaa A. Qaisar | | Journal of Ovarian Research. 2021; 14(1) | | [Pubmed] | [DOI] | | | 73 |
The effect of lutein and Urtica dioica extract on in vitro production of embryo and oxidative status in polycystic ovary syndrome in a model of mice |
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| E. Bandariyan,A. Mogheiseh,A. Ahmadi | | BMC Complementary Medicine and Therapies. 2021; 21(1) | | [Pubmed] | [DOI] | | | 74 |
Uric acid participating in female reproductive disorders: a review |
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| Junhao Hu,Wenyi Xu,Haiyan Yang,Liangshan Mu | | Reproductive Biology and Endocrinology. 2021; 19(1) | | [Pubmed] | [DOI] | | | 75 |
Integral assessment of lipoperoxidation processes in women with ovarian hyperandrogenism |
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| L. I. Kolesnikova,O. V. Krusko,L. V. Belenkaya,L. V. Sholokhov,L. A. Grebenkina,N. A. Kurashova,S. I. Kolesnikov | | Bulletin of Siberian Medicine. 2021; 20(1): 67 | | [Pubmed] | [DOI] | | | 76 |
Effects of Folic Acid Supplementation on Oxidative Stress Markers: A Systematic Review and Meta-Analysis of Randomized Controlled Trials |
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| Omid Asbaghi,Matin Ghanavati,Damoon Ashtary-Larky,Reza Bagheri,Mahnaz Rezaei Kelishadi,Behzad Nazarian,Michael Nordvall,Alexei Wong,Frédéric Dutheil,Katsuhiko Suzuki,Amirmansour Alavi Naeini | | Antioxidants. 2021; 10(6): 871 | | [Pubmed] | [DOI] | | | 77 |
Ovarian Telomerase and Female Fertility |
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| Simon Toupance,Anne-Julie Fattet,Simon N. Thornton,Athanase Benetos,Jean-Louis Guéant,Isabelle Koscinski | | Biomedicines. 2021; 9(7): 842 | | [Pubmed] | [DOI] | | | 78 |
Effect of Nutritional Supplementation on Oxidative Stress and Hormonal and Lipid Profiles in PCOS-Affected Females |
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| Pallavi Dubey,Sireesha Reddy,Sarah Boyd,Christina Bracamontes,Sheralyn Sanchez,Munmun Chattopadhyay,Alok Dwivedi | | Nutrients. 2021; 13(9): 2938 | | [Pubmed] | [DOI] | | | 79 |
Mitochondrial Dysfunction and Chronic Inflammation in Polycystic Ovary Syndrome |
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| Siarhei A. Dabravolski,Nikita G. Nikiforov,Ali H. Eid,Ludmila V. Nedosugova,Antonina V. Starodubova,Tatyana V. Popkova,Evgeny E. Bezsonov,Alexander N. Orekhov | | International Journal of Molecular Sciences. 2021; 22(8): 3923 | | [Pubmed] | [DOI] | | | 80 |
Effect of healthy lifestyle promotion on anthropometric variables, eating behavior and cardiometabolic risk factors in women with polycystic ovarian syndrome |
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| Latifa Imen Benharrat,Azzedine Senouci,Wassila Benhabib,Khedidja Mekki | | The North African Journal of Food and Nutrition Research. 2020; 4(9): S46 | | [Pubmed] | [DOI] | | | 81 |
Methylglyoxal-Dependent Glycative Stress and Deregulation of SIRT1 Functional Network in the Ovary of PCOS Mice |
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| Giovanna Di Emidio,Martina Placidi,Francesco Rea,Giulia Rossi,Stefano Falone,Loredana Cristiano,Stefania Nottola,Anna Maria D’Alessandro,Fernanda Amicarelli,Maria Grazia Palmerini,Carla Tatone | | Cells. 2020; 9(1): 209 | | [Pubmed] | [DOI] | | | 82 |
Regulatory Functions of L-Carnitine, Acetyl, and Propionyl L-Carnitine in a PCOS Mouse Model: Focus on Antioxidant/Antiglycative Molecular Pathways in the Ovarian Microenvironment |
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| Giovanna Di Emidio,Francesco Rea,Martina Placidi,Giulia Rossi,Domenica Cocciolone,Ashraf Virmani,Guido Macchiarelli,Maria Grazia Palmerini,Anna Maria D’Alessandro,Paolo Giovanni Artini,Carla Tatone | | Antioxidants. 2020; 9(9): 867 | | [Pubmed] | [DOI] | | | 83 |
Both Matricaria chamomilla and Metformin Extract Improved the Function and Histological Structure of Thyroid Gland in Polycystic Ovary Syndrome Rats through Antioxidant Mechanism |
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| Ahlam Abdulaziz Alahmadi,Areej Ali Alzahrani,Soad Shaker Ali,Bassam Abdulaziz Alahmadi,Rana Ali Arab,Nagla Abd El-Aziz El-Shitany | | Biomolecules. 2020; 10(1): 88 | | [Pubmed] | [DOI] | | | 84 |
Identification of Variants in Mitochondrial D-Loop and OriL Region and Analysis of Mitochondrial DNA Copy Number in Women with Polycystic Ovary Syndrome |
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| Pallavi Shukla,Srabani Mukherjee,Anushree Patil | | DNA and Cell Biology. 2020; | | [Pubmed] | [DOI] | | | 85 |
Growth hormone alleviates oxidative stress and improves oocyte quality in Chinese women with polycystic ovary syndrome: a randomized controlled trial |
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| Yan Gong,Shan Luo,Ping Fan,Song Jin,Huili Zhu,Tang Deng,Yi Quan,Wei Huang | | Scientific Reports. 2020; 10(1) | | [Pubmed] | [DOI] | | | 86 |
GSTT1 deletion is a risk factor for polycystic ovary syndrome |
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| Maria Manuel Casteleiro Alves,Micaela Almeida,António Hélio Oliani,Luiza Breitenfeld,Ana Cristina Ramalhinho | | Reproductive BioMedicine Online. 2020; | | [Pubmed] | [DOI] | | | 87 |
Assessing the effect of MitoQ10 and Vitamin D3 on ovarian oxidative stress, steroidogenesis and histomorphology in DHEA induced PCOS mouse model |
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| Gordon Kyei,Aligholi Sobhani,Saeid Nekonam,Maryam Shabani,Fatemeh Ebrahimi,Maryam Qasemi,Elnaz Salahi,Amidi Fardin | | Heliyon. 2020; 6(7): e04279 | | [Pubmed] | [DOI] | | | 88 |
Nanocurcumin alleviates insulin resistance and pancreatic deficits in polycystic ovary syndrome rats: Insights on PI3K/AkT/mTOR and TNF-a modulations |
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| Nermeen Z. Abuelezz,Marwa E. Shabana,Heidi M. Abdel-Mageed,Laila Rashed,George N.B. Morcos | | Life Sciences. 2020; 256: 118003 | | [Pubmed] | [DOI] | | | 89 |
The ameliorative effects of marjoram in dehydroepiandrosterone induced polycystic ovary syndrome in rats |
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| Abeer M. Rababaæh,Bayan R. Matani,Mera A. Ababneh | | Life Sciences. 2020; 261: 118353 | | [Pubmed] | [DOI] | | | 90 |
Pathophysiological roles of chronic low-grade inflammation mediators in polycystic ovary syndrome |
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| Maryam Rostamtabar,Sedigheh Esmaeilzadeh,Mehdi Tourani,Abolfazl Rahmani,Masoud Baee,Fatemeh Shirafkan,Kiarash Saleki,Sajedeh S. Mirzababayi,Soheil Ebrahimpour,Hamid Reza Nouri | | Journal of Cellular Physiology. 2020; | | [Pubmed] | [DOI] | | | 91 |
Proteomic sift through serum and endometrium profiles unraveled signature proteins associated with subdued fertility and dampened endometrial receptivity in women with polycystic ovary syndrome |
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| Nadia Rashid,Aruna Nigam,S.K. Jain,Samar Husain Naqvi,Saima Wajid | | Cell and Tissue Research. 2020; | | [Pubmed] | [DOI] | | | 92 |
Associations Between Serum Magnesium Concentrations and Polycystic Ovary Syndrome Status: a Systematic Review and Meta-analysis |
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| Maedeh Babapour,Hamed Mohammadi,Maryam Kazemi,Amir Hadi,Mahsa Rezazadegan,Gholamreza Askari | | Biological Trace Element Research. 2020; | | [Pubmed] | [DOI] | | | 93 |
Improvement of anti-Müllerian hormone and oxidative stress through regular exercise in Chinese women with polycystic ovary syndrome |
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| Xia Wu,Heng Wu,Wenjiang Sun,Chen Wang | | Hormones. 2020; | | [Pubmed] | [DOI] | | | 94 |
Polycystic ovarian syndrome novel proteins and significant pathways identified using graph clustering approach |
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| Nor Afiqah-Aleng,Md. Altaf-Ul-Amin,Shigehiko Kanaya,Zeti-Azura Mohamed-Hussein | | Reproductive BioMedicine Online. 2019; | | [Pubmed] | [DOI] | | | 95 |
Roles of Oxidative Stress in Policystic Ovary Syndrome |
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| Marija Bicanin Ilic,Aleksandra Dimitrijevic,Igor Ilic | | Serbian Journal of Experimental and Clinical Research. 2019; 0(0) | | [Pubmed] | [DOI] | |
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