HIGHLIGHTS

• Oxidative stress can be defines as cellular conditions that increase from the variance between the creation of oxygen species in tissues and cell.
• The existence of reactive chemicals are known as reactive oxygen species,which are in two classes; free radicals, like lipid peroxyl radical and superoxide, and non radicals like nitric oxide radical and hydrogen peroxide. And they are solely formed as a usual result of energy formation,
• Sepsis is listed amongst the major genesis of death between patients that are censoriously sick
• The rise in the creation of reactive oxygen species at a lower level in respective pathophysiological states, that appear to be associated to inflammatory actions.

              CLINICIAN’S CORNER

• Oxidative stress arises when reactive oxygen species formation and the antioxidant defence tools are in disparity. Above 10-15 years , studies has been done to pursue interpretation of the part of oxygen toxicity in addition to reactive oxygen species in cardiac dysfunction beneath a broad diversity of pathiophysiological state. The rise in production of reactive oxygen species is normally connected with oxidative stress and future cardiovascular tissue injury.
• Deformity in myocyte role requiste to oxidative stress are review to be related with the results of reactive oxygen species on subcellular organelles. In spite of the fact that ca^{2+ _}overload in myocytes can be instigated by reactive oxygen species by directly infecting the ca²⁺-handling proteins or indirectly by instigating membrane lipid peroxidation, this may not be the sole tool for the development of ca²⁺-overload and ensuing cell injury. Systems more than oxidative stress like a rise in the concentration of sodium in the cell probably also out-turn in the production of intracellular ca²⁺-overload. A rise in membrane permeability and damaged protein function expected to be the build-up of long chain fatty acids in cardiac membranes have additionally been recommended to produce ca²⁺-overload.
• Few years ago, it has flatter visible that mitochondrial dysfunction and energetic defficiency of cells are associated to organ failure and worse result of septic patients. Also, rise in reactive oxygen species formation and damage to the mitochondrion consequence in low ATP levels, which could make cell vulnerability to the faustration of membrane-attached Atpasees. Mitochondrion dysfunction may begin the imbalance in intracellular ions, such as unrestrained release of ca²⁺.Absolutely, these result may climax in apotosis and necrosis, which donate to several organ failure detected in the last stage of complex sepsis.
• From my conclusion , it shows that oxidative stress plays a vital part in the performance of the cardiovascular system in disease and health. However, the starting point result correlation of oxidative stress with whichever of the cardiovascular diseases still residue to be established, rise in reactive oxygen species specifying the existence of oxidative stress has been notice in a broad diversity of innovative and clinical states. Moreover, antioxidant remedy has demonstrated more advantageous result in cardiovascular diseases.

OXIDATIVE STRESS, ONE OF THE LEADING CAUSE OF CARDIOVASCULAR DISEASE

ABSTRACT

Oxidative stress can be defined as cellular conditions that arises from the variance between the creation of oxygen species in tissues and cells vascular and cardiac myocytes give account of the injury in the cell that is been attributed from the high degree of generation of reactive oxygen species and the low level of antioxidant supply. Sepsis also known as as an organ killer dysfunction resulted from the dysregulation provider of infection.While, sepsis-induced cardiomyopathy is frequently called Myocardial dysfuction, is a persistant problem and is corporation with less well outcomes. Damage is caused by reactive oxygen species, are mostly initiated because of the efficiency of reactive oxygen species to develop changes in subcellular organelles and induce intracellular calcium ion-overload.

KEYWORDS: Oxidative stress, sepsis, Roles of reactive oxygen species

BACKGROUND

Oxidative stress can be stated as cellular conditions that arises from the variance at the creation of reactive oxygen species in tissues and cells, (Pizzino et al., 2017). Nevertheless, reactive oxygen species has been thought about as the major cause in cell injury whether it takes place in organism with a structure of  biochemical protection to counteract the oxidative effects of reactive oxygen species (Brieger, Schiavone, Miller & Krause, 2012) for as much that it  plays the key role in  the generation of cardiovascular abnormaility (Di Meo, Reed, Venditti & Victor, 2016) which  is been associated with oxidative stress.It also play roles in different types of cardiovascular diseases like, congestive heart failure, cardiomyopathies, hypertension, atherosclerosis, sepsis, cardiac hypertrophy and ischemic heart disease (Taverne et al., 2013) .When the  amount of reactive oxygen species increase, it will give rise to the harmful effects on the vital cellular structures like nucleic acids, lipids and proteins (Wu, Kosten & Zhang, 2013) .

ROLES OF REACTIVE OXYGEN SPECIES

Singlet oxygen, hydroxyl radicals and superoxide radicals are examples of reactive oxygen species (Hopkins, 2016)  are majorly produced by the power house of the cell which is the mitochondria, both in the pathiological and in the physiological state, moreover this superoxide can be combined to create cellular respiration by cyclooxygenases and lipoxygenases throughout the metabolism of arachidonic and by inflammatory cells and the endothelial (Al-Gubory, Garrel, Faure & Sugino, 2012) .Also free radicals which can be defined as, ions or molecules that have the presence of one or more unpaired  single electron in their outermost shell of electrons(Niwano, 2014). Examples include superoxide radicals, singlet oxygen , peroxynitrous acid,  hydroxyl radicals, peroxyl radical, hydgroen peroxide(Lushchak, 2014) and (Lushchak, 2015). Examples of reactive nitrogen species are nitric oxide, which is absolutely unreactive, and its other source peroxynitrite, a strong oxidant will be able harm numerous biological molecules (Radi, 2013) . These radicals are also been produced because of metabolic by- products by biological systems (Sato H., et al 2013) . Whenever this reactive oxygen (Navarro-Yepes et al., 2014) increases in production throughout the process of metabolism(He and Zuo, 2015), this will result in enzymatic reactions,

HOW OXIDATIVE STRESS LEADS TO SEPSIS AND ITS MITOCHONDRIAL DYSFUNCTION

The maintenance of appropriate organ perfusion is essential as an outcome of the cardiovascular system. Although, unexpectedly cardiovascular dysfunction influence the process of sepsis (Colbert & Schmidt, 2016). Actually, the presence of intense circulatory deformities, through metabolic and living cells disorder, describe group some sick peolpe in connection of a great number of  mortality which is known as  challenge of septic shock. Hence, inherent myocardial dynsfunction(Singer, 2013)  found with sick people with septic shock was noticed. Sepsis-induced cardiomyopathy has mainly been explained as an inherent and the reverse side of the right and left sides of the diastolic and also the systolic dysfunction of the hearts which is been influence by the challenge of sepsis,  (Stanzani, Duchen & Singer, 2019). Inflammatory reactions begin by oxidative stress appear between the activation of radox pathways for transcriptional activation. For instance a rise in activation of nuclear factor KB (NFKB) and a rise in circulating inflammatory(Zhang et al., 2010) mediators . Sepsis-induced organ dysfunction has occur indicating to be the minimun in fragament required in mitochondrial dysfunction (Reynolds, 2012) as an evidence and which results in the failure of energy formation (Galley, 2011) .  Reactive oxygen species and nitric oxide when they both merge, with the coming together of different compound inflammatory mediators which can function in directly or indirectly impact the mitochondria function and energy formation (Handy & Loscalzo, 2012). Consequently, pathiophysiology of organ failure in sepsis appears to be basic as a result of oxidative stress-mediated harm to mitochondria(Garrabou et al., 2011), recommending a therapeautic part for antioxidants(Sena & Chandel, 2012). Hence, it has been recommended by different specialist that antioxidants directed to mitochondrial might be of more advantage (Bolisetty & Jaimes, 2013) , ( See figure 1 below).

Figure 1 : The above figure shows how cellular origin of reactive oxygen species is generated. (Venditti, Napolitano & Di Meo, 2015)

Reactive oxygen species is highly base metabolic oxygen products with an unpaired electron (Zorov, Juhaszova and Sollott, 2014). Substantially, reactive oxygen species are signaling molecules that has the capacity to effect many processes, which makes it to serve as an essential part of cellular signaling route(Zhang et al., 2016) (Montezano AC. et al 2012). In the biological systems there are forms of relevant reactive oxygen species which are also free radicals,like hydroxyl radicals, superoxide(Santo, Zhu & Li, 2016), and some non-radicals like , singlet oxygen  and ozone (O₃) can also generate free radicals.  Reactive oxygen species is been produced by different oxidase enzymes(Zhang, 2016,) like xanthine oxidase, cytochrome P450 oxidase,L-gulonolactone oxidase, lysyl oxidase, laccase, Monoamine oxidase, nicotinamide-adenine dinucleotide phosphate (NADPH) oxidase, lipoxygenase,  transport of electron in the mitochondria and uncoupled endothelial NO synthase (eNOS) (Papageorgiou N.et al 2013) and (Tousoulis D, et al 2011) and (Rosa et al., 2010).

                               EXAMPLES OF SOME RADICALS AND NON – RADICALS

RADICALS	NON- RADICALS
Peroxylnitrite	Ozone
Superoxide radical	Hydrogen peroxide
Hydroxy radical	Hydrochloric acid
Lipid peroxyl radical	Nitric oxide radical
	Singlet oxygen

Fig 1. : The above table illustrates the different types of radicals and non-radicals.

Some key enzymes that are antioxidant such as, glutathione reductase, glucose -6-phoshate dehydrogenase, glutathione S- transferase,hemeoxoygenase, and glutathione peroxidase (GSHPxs), restrict intracellular and extracellular build-up  of harmful reactive oxygen. Superoxide , is one of the primary radicals that can lead to the making and generation of more reactive oxygen species,  (Hopkins, 2016). Superoxide when form as a smaller by-product in a smaller amount of molecular oxygen during mitochondrial oxidative phosphorylation (Schulz, Wenzel, Münzel & Daiber, 2014). Superoxide can gets deactivated by Nitrogen oxide or superoxide dismutase .Superoxide dismutase enzymes, quickly convert superoxide into hydrogen peroxide, which will now break itself down by glutathione peroxidase and catalayse into water. When Fenton reaction is been used  (Kumar & Pandey, 2015). One of the most important mechanisms which makes reactive oxygen species give rise to vascular disease is by going through the superoxide-mediation of nitric oxide.(Drummond GR and Sobey CG, 2014), the non-radical peroxynitrite can bring about the irreversible destruction to some macro molecules, therefore promote cell death and distrupts cell crucial signalling pathways. Until now deterioration of antioxidant resisting attack system of free radicals that destroy the operation of the antioxidants at the current time can be seen to bring about cellular impairment  .

CALCIUM OVERLOAD IN CARDIAC INJURY BY INTERACTING WITH REACTIVE OXYGEN SPECIES

In spite of the fact that Ca2+-overload in myocytes can give rise to reactive oxygen species(Liu, Liu & Dudley, 2010) by directly making a difference in Ca2+ grasping proteins by giving rise to membrane lipid perioxidation indirectly. A rise in concentration of the sodium found in cell can also generated in the expansion of intracellular Ca2+-overload (Orrenius, Gogvadze & Zhivotovsky, 2015), compare to oxidative stress mechanisms (Liu, Liu & Dudley, 2011) . Impaired proton and increased membrane permeability play a role in the acquisition relating to lung fatty acids found in the cardiac membranes,which also be brought forward to give rise to Ca2+-overload .Absence of Adenosine triphosphate can also result in impairement of the Ca2+-handling mechanisms in the sarcoplamal, also the sarcoplasmic reticular membrane and their by influencing Ca2+-overload. Increase adrenergic stimulation throughout reperfusion injury (Braunersreuther & Jaquet, 2012) of the ischemic heart can likely give rise by taking up of extracellular Ca2+ into the myocardium directly (Perrelli, 2011), because some cellular proteins like sarcoplasmic reticulum Ca2+-pump ATPase (Aldosari, Awad, Harrington, Sellke & Abid, 2018) .However, glutathione peroxidase, superoxide dismutase and catalase which are examples of endogenous antioxidant proteins, may likely be singled out for calcium ion activated proteases.

FUNCTIONAL ROLE OF FREE RADICALS IN CARDIOVASCULAR DISEASES

Though, increase in different aspects of cardiovascular disease is been caused by oxidative stress  (Goswami & Maulik, 2015) . The rise in the creation of reactive oxygen species beneath diverse pathophysiological conditions, that appear to be connected to inflammatory actions, which is poorly been understood, (Kanoore Edul, Ferrara & Dubin, 2010). This is because damaged mitochondrial depletion (“Announcement: Targeting Mitochondria 2010”, 2010) of molecular oxygen can be an intracellular sources can result in the release by phagocytic white blood cells , auto-oxidation of catecholamines, either by  the endothelial(Colbert & Schmidt, 2016) cells like earlier said reactive oxygen can also arise from cellular injury(Zhang et al., 2010) which may result to subjection to ionizing cigarette smoking, radiation, ultraviolet rays and additional air pollutants. Cardiac obstructions leading to contractile impairment and dysrhythmias and in addition to vascular obstructions leading to atherosclerosis and hypertension are correlated. The introduction of calcium ion (Ca²⁺) into vascular myocytes can boost and then can trigger neointimal hyperplasia for the development of atherosclerosis in addition to vasoconstuction for the maturing of hypertension.

CONCLUDING REMARK

Since oxidative stress plays a vita part as it thereby function in disease and health of the cardiovascular system, also in vascular, also cardiac myocytes . Hence, it has been recommended by different specialist that antioxidants directed to mitochondria might be of more advantage.

REFRENCE

Aldosari, S., Awad, M., Harrington, E., Sellke, F., & Abid, M. (2018). Subcellular Reactive Oxygen Species (ROS) in Cardiovascular Pathophysiology. Antioxidants, 7(1), 14. doi: 10.3390/antiox7010014

Al-Gubory, K., Garrel, C., Faure, P., & Sugino, N. (2012). Roles of antioxidant enzymes in corpus luteum rescue from reactive oxygen species-induced oxidative stress. Reproductive Biomedicine Online, 25(6), 551-560. doi: 10.1016/j.rbmo.2012.08.004

Announcement: Targeting Mitochondria 2010. (2010). Mitochondrion, 10(5), V. doi: 10.1016/s1567-7249(10)00144-3

Bolisetty, S., & Jaimes, E. (2013). Mitochondria and Reactive Oxygen Species: Physiology and Pathophysiology. International Journal Of Molecular Sciences, 14(3), 6306-6344. doi: 10.3390/ijms14036306

Braunersreuther, V., & Jaquet, V. (2012). Reactive Oxygen Species in Myocardial Reperfusion Injury: From Physiopathology to Therapeutic Approaches. Current Pharmaceutical Biotechnology, 13(1), 97-114. doi: 10.2174/138920112798868782

Brieger, K., Schiavone, S., Miller, J., & Krause, K. (2012). Reactive oxygen species: from health to disease. Swiss Medical Weekly. doi: 10.4414/smw.2012.13659

Colbert, J., & Schmidt, E. (2016). Endothelial and Microcirculatory Function and Dysfunction in Sepsis. Clinics In Chest Medicine, 37(2), 263-275. doi: 10.1016/j.ccm.2016.01.009

Di Meo, S., Reed, T., Venditti, P., & Victor, V. (2016). Role of ROS and RNS Sources in Physiological and Pathological Conditions. Oxidative Medicine And Cellular Longevity, 2016, 1-44. doi: 10.1155/2016/1245049

Drummond, G., & Sobey, C. (2014). Endothelial NADPH oxidases: which NOX to target in vascular disease?. Trends In Endocrinology & Metabolism, 25(9), 452-463. doi: 10.1016/j.tem.2014.06.012

Galley, H. (2011). Oxidative stress and mitochondrial dysfunction in sepsis. British Journal Of Anaesthesia, 107(1), 57-64. doi: 10.1093/bja/aer093

Garrabou, G., Morén, C., López, S., Tobías, E., Cardellach, F., Miró, Ò., & Casademont, J. (2011). The Effects of Sepsis on Mitochondria. The Journal Of Infectious Diseases, 205(3), 392-400. doi: 10.1093/infdis/jir764 

Goswami, S., & Maulik, S. (2015). Oxidative stress in cardiovascular diseases. Journal Of The Practice Of Cardiovascular Sciences, 1(1), 15. doi: 10.4103/2395-5414.157555

Handy, D., & Loscalzo, J. (2012). Redox Regulation of Mitochondrial Function. Antioxidants & Redox Signaling, 16(11), 1323-1367. doi: 10.1089/ars.2011.4123: 10.1155/2017/8416763

He, F. and Zuo, L. (2015). Redox Roles of Reactive Oxygen Species in Cardiovascular Diseases. International Journal of Molecular Sciences, 16(11), pp.27770-27780.

Hopkins, R. (2016). ROS in Nature 2016: Part I. Reactive Oxygen Species, 207-215. doi: 10.20455/ros.2016.839

Hopkins, R. (2016). Superoxide in Biology and Medicine: An Overview. Reactive Oxygen Species. doi: 10.20455/ros.2016.825

Kanoore Edul, V., Ferrara, G., & Dubin, A. (2010). Microcirculatory Dysfunction in Sepsis. Endocrine, Metabolic & Immune Disorders – Drug Targets, 10(3), 235-246. doi: 10.2174/187153010791936847

Kumar, S., & Pandey, A. (2015). Free Radicals: Health Implications and their Mitigation by Herbals. British Journal Of Medicine And Medical Research, 7(6), 438-457. doi: 10.9734/bjmmr/2015/16284

Liu, M., Liu, H., & Dudley, S. (2011). Mitochondrial Reactive Oxygen Species Regulate the Cardiac Na+ Channel. Biophysical Journal, 100(3), 424a. doi: 10.1016/j.bpj.2010.12.2511

Liu, M., Liu, H., & Dudley, S. (2010). Reactive Oxygen Species Originating from Mitochondria Regulate the Cardiac Sodium Channel. Heart Rhythm, 7(11), 1717. doi: 10.1016/j.hrthm.2010.09.044

Li, Y., & Trush, M. (2016). Defining ROS in Biology and Medicine. Reactive Oxygen Species, 1(1). doi: 10.20455/ros.2016.803

Lushchak, V. (2015). Free radicals, reactive oxygen species, oxidative stresses and their classifications. The Ukrainian Biochemical Journal, 87(6), 11-18. doi: 10.15407/ubj87.06.011

Navarro-Yepes, J., Zavala-Flores, L., Anandhan, A., Wang, F., Skotak, M., & Chandra, N. et al. (2014). Antioxidant gene therapy against neuronal cell death. Pharmacology & Therapeutics, 142(2), 206-230. doi: 10.1016/j.pharmthera.2013.12.007

Niwano, Y. (2014). How to Regulate Reactive Oxygen Species?. Journal Of Biomolecular Research & Therapeutics, 03(02). doi: 10.4172/2167-7956.1000e130

Orrenius, S., Gogvadze, V., & Zhivotovsky, B. (2015). Calcium and mitochondria in the regulation of cell death. Biochemical And Biophysical Research Communications, 460(1), 72-81. doi: 10.1016/j.bbrc.2015.01.137

Perrelli, M. (2011). Ischemia/reperfusion injury and cardioprotective mechanisms: Role of mitochondria and reactive oxygen species. World Journal Of Cardiology, 3(6), 186. doi: 10.4330/wjc.v3.i6.186

Pizzino, G., Irrera, N., Cucinotta, M., Pallio, G., Mannino, F., & Arcoraci, V. et al. (2017). Oxidative Stress: Harms and Benefits for Human Health. Oxidative Medicine And Cellular Longevity, 2017, 1-13. doi: 10.1155/2017/8416763

Radi, R. (2013). Peroxynitrite, a Stealthy Biological Oxidant. Journal Of Biological Chemistry, 288(37), 26464-26472. doi: 10.1074/jbc.r113.472936

Reynolds, M. (2012). The Effects of Sepsis on Mitochondria. The Journal Of Emergency Medicine, 42(5), 625. doi: 10.1016/j.jemermed.2012.03.013

Rigoulet, M., Yoboue, E., & Devin, A. (2011). Mitochondrial ROS Generation and Its Regulation: Mechanisms Involved in H2O2 Signaling. Antioxidants & Redox Signaling, 14(3), 459-468. doi: 10.1089/ars.2010.3363

Rosa, S., Cirillo, P., Paglia, A., Sasso, L., Palma, V., & Chiariello, M. (2010). Reactive Oxygen Species and Antioxidants in the Pathophysiology of Cardiovascular Disease: Does the Actual Knowledge Justify a Clinical Approach?. Current Vascular Pharmacology, 8(2), 259-275. doi: 10.2174/157016110790887009

Sato, H., Shibata, M., Shimizu, T., Shibata, S., Toriumi, H., Ebine, T., Kuroi, T., Iwashita, T., Funakubo, M., Kayama, Y., Akazawa, C., Wajima, K., Nakagawa, T., Okano, & Suzuki, N. (2013). Differential cellular localization of antioxidant enzymes in the trigeminal ganglion. Neuroscience, 248, 345-358. doi: 10.1016/j.neuroscience.2013.06.010

Santo, A., Zhu, H., & Li, Y. (2016). Free Radicals: From Health to Disease. Reactive Oxygen Species. doi: 10.20455/ros.2016.847

Schulz, E., Wenzel, P., Münzel, T., & Daiber, A. (2014). Mitochondrial Redox Signaling: Interaction of Mitochondrial Reactive Oxygen Species with Other Sources of Oxidative Stress. Antioxidants & Redox Signaling, 20(2), 308-324. doi: 10.1089/ars.2012.4609

Sena, L., & Chandel, N. (2012). Physiological Roles of Mitochondrial Reactive Oxygen Species. Molecular Cell, 48(2), 158-167. doi: 10.1016/j.molcel.2012.09.025

Singer, M. (2013). The role of mitochondrial dysfunction in sepsis-induced multi-organ failure. Virulence, 5(1), 66-72. doi: 10.4161/viru.26907

Stanzani, G., Duchen, M., & Singer, M. (2019). The role of mitochondria in sepsis-induced cardiomyopathy. Biochimica Et Biophysica Acta (BBA) – Molecular Basis Of Disease, 1865(4), 759-773. doi: 10.1016/j.bbadis.2018.10.011

Taverne, Y., Bogers, A., Duncker, D. and Merkus, D. (2013). Reactive Oxygen Species and the Cardiovascular System. Oxidative Medicine and Cellular Longevity, 2013, pp.1-15.

Venditti, P., Napolitano, G., & Di Meo, S. (2015). Role of Mitochondria and Other ROS Sources in Hyperthyroidism-Linked Oxidative Stress. Immunology‚ Endocrine & Metabolic Agents In Medicinal Chemistry, 15(1), 5-36. doi: 10.2174/187152221501150710124951

Wu, J., Kosten, T., & Zhang, X. (2013). Free radicals, antioxidant defense systems, and schizophrenia. Progress In Neuro-Psychopharmacology And Biological Psychiatry, 46, 200-206. doi: 10.1016/j.pnpbp.2013.02.015

Zhang, J., Wang, X., Vikash, V., Ye, Q., Wu, D., Liu, Y., & Dong, W. (2016). ROS and ROS-Mediated Cellular Signaling. Oxidative Medicine And Cellular Longevity, 2016, 1-18. doi: 10.1155/2016/4350965

Zhang, Q., Raoof, M., Chen, Y., Sumi, Y., Sursal, Toga, S., Wolfgang, J., Karim, B., Kiyoshi, I., & Junger, W. (2010). Circulating mitochondrial DAMPs cause inflammatory responses to injury. Nature, 464(7285), 104-107. doi: 10.1038/nature08780

Zhang, W. (2016). The Role of NADPH Oxidases in Cardiovascular Disease. Journal Of Vascular Medicine & Surgery, 04(03). doi: 10.4172/2329-6925.1000265

Zorov, D., Juhaszova, M. and Sollott, S. (2014). Mitochondrial Reactive Oxygen Species (ROS) and ROS-Induced ROS Release. Physiological Reviews, 94(3), pp.909-950.

Zuo, L., Zhou, T., Pannell, B., Ziegler, A. and Best, T. (2015). Biological and physiological role of reactive oxygen species – the good, the bad and the ugly. Acta Physiologica, 214(3), pp.329-348.

Thanks for joining me!

Good company in a journey makes the way seem shorter. — Izaak Walton