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Malondialdehyde (MDA) and 8-hydroxy-2′-deoxyguanosine (8-OHdG) in ischemic stroke: a systematic review
The Egyptian Journal of Neurology, Psychiatry and Neurosurgery volume 59, Article number: 87 (2023)
Abstract
Introduction
The low blood flow in ischemic stroke reduces oxygen and glucose and induces a series of reactions that produce free radicals. Free radicals can destroy cell membranes (lipid peroxidation) marked by the elevation of malondialdehyde (MDA), and the damage of deoxyribonucleic acid (DNA) showed by the elevation of 8-hydroxy-2’-deoxyguanosine (8-OHdG). This review aimed to assess and conclude the research-based study systematically to analyze the relationship of MDA/8-OHdG and ischemic stroke.
Method
Cochrane handbook for systematic reviews, the guideline of preferred reporting items for systematic review and meta-analysis (PRISMA), and synthesis without meta-analysis (SWiM) in systematic reviews: reporting guideline was used as guideline in this systematic review. Inclusion criteria in this review were primary studies of every design, articles published in English around January 2000–December 2021, and the study used human as subject. A systematic literature search was applied in 15 electronic medical journals. The authors assessed the study quality and risk of bias of each included study.
Results
The authors evaluated 374 studies found in literature searching, 30 studies met the criteria for this review, and then underwent the assessment of study quality and risk of bias.
Conclusion
MDA has the role as oxidative stress biomarker, outcome predictor, mortality predictor, post-stroke cognitive impairment predictor, post-stroke depression predictor, and hand grip strength predictor of ischemic stroke; while 8-OHdG has the role as oxidative stress biomarker, outcome predictor, mortality predictor, post-stroke cognitive impairment predictor, post-stroke depression predictor of ischemic stroke.
Introduction
Stroke is a significant contributor to morbidity, disability, and mortality in the world [1,2,3]. American Heart Association (AHA) reported the mortality rate of stroke increased about 0.7 per 100.000 from 2010 to 2016 in 35–64 years of age; while Centers for Disease Control and Prevention (CDC) reported that every 4 min someone dies due to stroke, and stroke also reduces mobility in more than 50% of stroke geriatric survivors [4, 5]. Ischemic stroke is the frequent stroke (approximately 80% of stroke) caused by impaired perfusion to the brain [4,5,6,7,8].
Oxidative (and nitrosative) stress is described as a disproportion of pro-oxidants (such as free radicals) and antioxidants, which has been associated with the pathogenesis of several chronic disorders such as ischemic stroke due to the dysfunction of blood–brain barrier (BBB) and neuronal degeneration and apoptosis [9,10,11]. Oxidative (and nitrosative) stress has an essential role in ischemic stroke through several actions. The low blood flow in ischemic stroke reduces the oxygen and glucose and induces a series of reactions that produce free radicals (reactive oxygen species (ROS) and reactive nitrogen species (RNS)). Free radical has various roles including as a part of vascular regulatory system, oxygen pressure monitoring, and erythropoietin generation in small levels, but abundant levels of free radicals may oxidize macromolecules and lead to lethal cell damage (neuronal death and brain edema) [9,10,11,12]. Excitotoxic injury induces superoxide and nitric oxide (NO) generation, inducing the production of highly reactive products, including peroxynitrite and hydroxyl radicals, which can destroy lipids, proteins, and DNA [13]. The brain is particularly endangered to oxidative stress because of the high level of fatty acids cell membranes, its high rate of oxidative metabolic activity and potent generation of free radical (basal oxygen consumption), lower neuronal antioxidant capacity, and elevated concentration of iron (which acts to catalyze the conversion of H2O2 to highly reactive hydroxyl radicals) [14,15,16].
Free radicals can damage cell membrane (lipid peroxidation) marked by the elevation of malondialdehyde (MDA), and the damage of deoxyribonucleic acid (DNA) showed by the elevation of 8-hydroxy-2′-deoxyguanosine (8-OHdG). MDA is one of the aldehyde molecules product due to the breakage of polyunsaturated fatty acids chains in the cell membrane, while 8-OHdG is formed by the interaction of free radicals and guanine (nitrogen base in DNA) [17]. Haritha et al. (2020) reported the elevation of MDA level in ischemic stroke, while Elsayed et al. (2020) reported the correlation of MDA level and clinical outcome of ischemic stroke [18, 19]. Syafrita et al. (2020) reported that MDA and 8-OHdG were associated with depression post-stroke [10]. The role of biomarker in ischemic stroke is important, especially in hospitals with limited neuroimaging facilities.
MDA and 8-OHdG in ischemic stroke have been presented in different studies, but a systematic review about this topic was not available. The current systematic review aimed to evaluate and conclude the research-based study systematically to assess the relationship of MDA/8-OHdG and ischemic stroke.
Methods
This study’s protocol was recorded on International Prospective Register of Systematic Reviews (PROSPERO) (CRD42022289876). This review was conducted in accordance to Cochrane handbook for systematic reviews and the guideline of preferred reporting items for systematic review and meta-analysis (PRISMA) [20, 21]. The data collection and analysis (synthesis) were also conducted based on synthesis without meta-analysis (SWiM) in systematic reviews: reporting guideline [22].
Inclusion and exclusion criteria
Inclusion criteria:
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1.
Publication type:
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full-text manuscripts reported the relationship of MDA/8-OHdG and ischemic stroke
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Experimental study (clinical trial) and observational study [descriptive study (case report and case series) and analytical studies (cross-sectional, case–control, and prospective study)]
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2.
Articles published in English
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3.
Articles published in January 2000–December 2021
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4.
The study used human as subject
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5.
Objective, methodology, and outcome of study must discuss the relationship of MDA/8-OHdG and ischemic stroke.
Exclusion criteria:
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1.
Publication type was review
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2.
Variables that were associated with the relationship of MDA/8-OHdG and ischemic stroke.
Literature search
A systematic literature searching was used in these online medical bibliographic databases: Cambridge Core, Clinical Key, Cochrane, Ebsco, Embase, Emerald Insight, Google Scholar, JSTOR, Medline, Nature, Proquest, Pubmed, Science Direct, Scopus, and Springer Link. The search was performed using the following keywords for the title and abstract: (malondialdehyde OR MDA OR 8-hydroxy-2′-deoxyguanosine OR 8-OHdG OR 8-oxo-7,8-dihydro-2′-deoxyguanosine OR 8-OHdG) AND (ischemic stroke OR infarct stroke OR thrombotic stroke OR embolic stroke). The references from included studies were evaluated to avoid the loss of any published article.
Data collection and analysis
Articles were chosen for assessment after two authors (DT and AP) had checked keywords from the online medical bibliographic databases. The results of the literature search were deliberated with third author (RR), and any discrepancies of results were discussed. Selected full-papers were independently evaluated by the other authors (YA and AK). Selected articles for this systematic review were checked by two authors independently to confirm the results (RA and JB). The data from included articles were provided in a summary table, containing key points of each study. The key points of each study were: first author and country; study design; sample characteristic; management/outcome measure; and outcome/result.
Quality assessment
The first author assessed the study quality and risk of bias of each retrieved article and discussed them with other authors. Newcastle–Ottawa scale for prospective study was used to evaluate the quality and risk of bias of prospective study; interpretation of total score was: ≥ 7 points were considered in good studies, 5–6 points were considered in fair studies, < 5 points were considered in poor studies. Newcastle–Ottawa scale for case control study was applied to assess case control study; interpretation of total score was: ≥ 7 points were included in good studies, 5–6 points were included in fair studies, < 5 points were included in poor studies. Newcastle–Ottawa scale adapted for cross-sectional study was used to evaluate the quality and risk of bias of the cross-sectional study. Interpretation of total score was: 9–10 points were included in very good studies, 7–8 points were included in good studies, 5–6 points were included in satisfactory studies, and 0–4 points were included in unsatisfactory studies [23,24,25,26,27].
Results
Selection of articles for review
Figure 1 provides PRISMA flow diagram. At first, 364 peer-reviewed studies were found from online databases and an additional 10 studies were identified through other sources (search engine). After duplicates were eliminated, 212 studies remained for the title and abstract screening. Articles that did not meet the inclusion and exclusion criteria were not evaluated. Thirty-six articles were evaluated for eligibility of which 30 articles were included in this review.
Assessment of study validity (quality assessment and risk of bias)
All included articles were associated to MDA/8-OHdG and ischemic stroke. Table 1 presents quality scores for prospective studies and the studies had 5–9 points (fair and good study). Table 2 presents quality scores for case–control studies and the studies had 8–9 points (good study). Table 3 presents quality scores for cross-sectional studies and all of the studies had 8 points (good study).
Study characteristic
The study characteristics for the included studies are shown in Table 4. Most of the studies were prospective studies and discussed about oxidative stress biomarker of acute ischemic stroke (AIS).
Discussion
The role of oxidative stress in ischemic stroke
AIS induces the generation of free radicals through various mechanisms, including the stimulation of N-methyl-d-aspartate (NMDA) receptors, induction of neuronal nitric oxide synthase or cyclooxygenase (COX) 2, auto-oxidation of catecholamines metabolism of free fatty acids during ischemia, the generation of xanthine dehydrogenase to xanthine oxidase, mitochondrial impairment, and BBB disruption that cause migration of neutrophils and leukocytes [31, 39, 49].
O2−, H2O2, OH− are the principal route of the generation of ROS through the reduction of molecular oxygen. Oxidative stress is the result of uncontrolled ROS formation because of oxygen metabolism, oxygen reperfusion injury from hypoxic condition, and also hemoglobin and myoglobin oxidation. The condition of free radicals will cause the brain to consume more lipid, increases oxygen demand, and induces the oxidation of dopamine and glutamate. Additionally, the level of catalase enzyme in the neurons will decline, causing impairment of glutathione peroxidase ability to eradicate H2O2. ROS is a hazardous final product of oxidative phosphorylation and reperfusion injury, because it could cause cellular redox which will affect the activity of protein–protein bond and DNA–protein bond of certain enzymes and transcription factors [50]. The other effects of ROS actions are altered function of receptors, ion channels, and other membrane proteins; that damage cell membrane fluidity and permeability, cause lipid peroxidation, protein denaturation, nucleic acid and DNA damage, damage to cytoskeletal structure, and chemotaxis [49, 51]. When brain contains abundant polyunsaturated fatty acids, ROS could easily elevate lipid peroxidation. Lipid peroxidation can also be activated by non-radical ROS, especially in acidic conditions, including during ischemic stroke. Lipid peroxidation can change membrane instability and permeability, as well as the function of ion pumps on the membrane border. This condition will endanger ion homeostasis, and can lead to loss of membrane integrity and cell injury. Lipid peroxidation can also induce disintegration of pro-inflammatory isoprostanoid mediator which is highly dangerous and release strong oxidant like 4-hydroxynonenal (4-HNE) [50].
The importance of oxidative stress in ischemic stroke pathophysiology make the use of antioxidants became pivotal to provide protection from neurological impairment. Oxidative stress states occur when cellular antioxidant defenses are inadequate to sustain the level of free radicals under a lethal threshold. This may be due to uncontrolled generation of free radicals or the failure of antioxidant defenses, or both [44, 47]. The extensive lesion of oxidative stress damage is also dependent on the antioxidant defense mechanism (including antioxidant enzymes such as SOD, catalase, and glutathione peroxidase; and antioxidant non-enzymatic such as retinol, ascorbic acid, α-tocopherol, carotenoid, and uric acid) [18, 39]. In severe stroke, antioxidants cannot balance the huge free radicals due to the larger neurological damage lesion. The antioxidant enzymes are inducible enzymes, so the transcription and production take time [18]. Agents that can prevent or decrease the effect of oxidative stress and reduce the number of cell damage in stroke are called neuroprotective drugs, such as edaravone, tirilazad, citicoline, etc. [50, 52].
MDA and 8-OHdG in ischemic stroke
There were 30 studies that reported the use of MDA and 8-OHdG as ischemic stroke biomarkers. MDA and 8-OHdG were commonly used as biomarkers of oxidative stress in various diseases including stroke. They were the final result of oxidative stress process because of the degradation of cellular organelles. After the release of MDA and 8-OHdG into the extracellular space, it reached the CSF and blood; therefore, it had been applied as a reliable biomarker of oxidative stress [14]. Urinary 8-OHdG was also deliberated as a pivotal biomarker of oxidative stress because oxidized DNA (8-OHdG) was water-soluble and excreted into the urine without being further metabolized [16].
The different pathophysiology of lacunar infarction (small-vessel) and large-vessel infarction stroke make the difference of MDA and 8-OHdG levels in each type. The pathogenesis of lacunar infarction is lipohyalinosis, while atherothrombosis is the major cause of large-vessel infarction; and the stress oxidative level was higher in large-vessel infarction due to the infarction volume [12, 39]. The number of risk factors in each type of ischemic stroke also affects the level of oxidative stress [12].
The lipid peroxidation due to acute ischemia; and conversion of xanthine dehydrogenase to xanthine oxidase and protein kinase activation (due to the activation of phospholipase and protease because of the elevation of cytosolic calcium) are the main cause of MDA elevation in AIS [9, 31, 39, 49]. The reason for high MDA concentration in chronic stroke is associated with risk factors and/or atherosclerosis itself; although the concentration of oxidative stress is lower than acute stroke (due to the antioxidant effect and disease course) [41, 44]. Elevation peroxidation results are associated with red blood cell aggregation, and also initiate NADPH-oxidase complex in phagocytes and activate stages of events leading to elevated uptake of low-density lipoprotein by macrophages, and finally leading to the generation of foam cells. By these mechanisms, lipid peroxides are associated with the pathophysiology of atherosclerosis [41].
Six studies focused on the importance of MDA and 8-OHdG in predicting ischemic stroke outcome [9, 12, 18, 38, 39, 42]. Lipid peroxidation due to misfolding of a-synuclein had a pivotal role in neuronal cell death. ROS due to lipid peroxidation could trigger p53 signaling cascade; impaired cell membrane (the damage of ion transport proteins and regulatory systems), induced functional damage of mitochondrial and DNA, and inhibited nucleotide excision repair system [17, 53]. The interaction of MDA and protein and nucleic acid could cause permanent impairment of the enzymes, receptors, and membrane transfer mechanisms [9, 14]. There was an abundant production of MDA and 8-OHdG through ischemia in the penumbral tissue which had minimal oxygen supply (secondary enlargement of brain impairment after focal cerebral ischemia). In the first phase of ischemic stroke, there was an increase of MDA and 8-OHdG because of the failure of defense mechanisms of oxidative stress, that considered from the volume of tissue damage, stroke severity, and outcome [12, 17, 18]. Three studies explained about the role of MDA and 8-OHdG as mortality biomarker in ischemic stroke [33,34,35]. Lorente et al. reported that MDA level (> 2.27 nmol/mL) and 8-OHdG level (> 4.82 ng/mL) were associated with 30-day mortality of IS patients [33, 35].
Three studies reported about the importance of MDA and 8-OHdG in detecting post-stroke depression (PSD) [10, 11, 17]. Liu et al. (2018) reported that 8-OHdG level above 200 ng/L was positively correlated with PSD [11]. PSD was the most frequent neuropsychiatric disorder after stroke (the prevalence was 29–35%) and was associated with worse functional outcome [53]. Oxidative stress could induce the dysregulation of hypothalamus–pituitary–adrenal axis, affected into the stress control; and the other factors such as age, lifestyle, alcohol, and smoking also contribute in the PSD [10, 11]. Oxidative stress changed the chemical structure of endogenous fatty acids, and produced immunogenic neoepitopes that could induce secondary immune responses, activates indolamine 2,3-dioxygenase and tryptophan catabolites that decreased serotonin level; thus link to depression [53]. Liu et al. (2017) reported about the association of MDA and 8-OHdG and post-stroke cognitive impairment (PSCI); and concluded that MDA (> 2.59 nmol/mL) and 8-OHdG (> 158.63 ng/L) level were associated with PSCI. Vascular inflammation, neurodegeneration, and BBB disruption (extravasation of oxidative stress products) were the main pathophysiology of this association due to hypoxia–ischemia brain cell. Additionally, oxidative stress could promote impairment of peroxisome proliferator-activated receptor (PPAR-γ), a condition that was correlated with vascular aging, neuroinflammation, cerebrovascular white matter lesion, and cognitive impairment [17]. Mueangson et al. (2020) reported about the use of MDA as low hand grip strength (HGS) biomarker in stroke patients. HGS was known as reliable parameter in muscle strength measurement after stroke. The elevation of lipid peroxide and MDA levels were associated with the production by peripheral cells, extracellular generation of hydrogen peroxide by paretic muscles during denervation and associated comorbidities (diabetes, hypertension, and dyslipidemia) [45].
Strength and limitation of the study
This systematic review consisted of 30 studies that discussed the relationship of MDA/8-OHdG and ischemic stroke. The majority of the studies discussed oxidative stress biomarker of acute ischemic stroke.
The limitation of the study was all of the studies were observational, the baseline characteristics were various, the variance of the demography in the human study, confounding variables in each study (human study), sample size, and limited follow-up time.
Future implication
The current systematic review can be a scientific publication to physicians, researchers, and all of the readers associated with the relationship of MDA/8-OHdG and ischemic stroke. Further research is needed with the larger sample size with diverse demographic variances and longer follow-up time, the comparison of these biomarkers with gold standard examination (such as neuroimaging), and also the role of these biomarkers in ischemic stroke treatment.
Conclusion
MDA has the role as oxidative stress biomarker, outcome predictor, mortality predictor, post-stroke cognitive impairment predictor, post-stroke depression predictor, and hand grip strength predictor of ischemic stroke; while 8-OHdG has the role as oxidative stress biomarker, outcome predictor, mortality predictor, post-stroke cognitive impairment predictor, post-stroke depression predictor of ischemic stroke.
Availability of data and materials
All data generated or analysed during this study are included in this published article.
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DT, AP, and AK: conceived the original idea and collected data; RR: collected data and proof outline; YA, RA, and JB: wrote the manuscript with the support of other authors. All authors have read and approved the final manuscript to be published.
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Tugasworo, D., Prasetyo, A., Kurnianto, A. et al. Malondialdehyde (MDA) and 8-hydroxy-2′-deoxyguanosine (8-OHdG) in ischemic stroke: a systematic review. Egypt J Neurol Psychiatry Neurosurg 59, 87 (2023). https://doi.org/10.1186/s41983-023-00688-6
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DOI: https://doi.org/10.1186/s41983-023-00688-6