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      Oxidation-reduction potential as a new marker for oxidative stress: Correlation to male infertility

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          Abstract

          Male infertility affects men worldwide. Oxidative stress (OS), characterized by an overabundance of reactive oxygen species (ROS) or a deficiency of antioxidants, is one of the major causes of male infertility. OS causes damage at the molecular level, which impairs lipids, proteins, and DNA. The cyclic cascade of redox reactions weakens sperm function which leads to poor semen parameters and eventual sterility. There is a need for advanced diagnostic tests that can quickly and accurately detect OS. Most commonly used assays can only measure single constituents of OS. However, the MiOXSYS System introduces a new strategy to detect OS by measuring the oxidation-reduction potential (ORP)--a direct evaluation of the redox balance between ROS and antioxidants. The MiOXSYS System has shown promise as a diagnostic tool in the evaluation of male infertility. This review explores the concept of ORP, details the principle of the MiOXSYS System, and summarizes the findings in clinical studies that support ORP measurement in semen.

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          Most cited references89

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          Oxidative Stress, Mitochondrial Dysfunction, and Aging

          Aging is an intricate phenomenon characterized by progressive decline in physiological functions and increase in mortality that is often accompanied by many pathological diseases. Although aging is almost universally conserved among all organisms, the underlying molecular mechanisms of aging remain largely elusive. Many theories of aging have been proposed, including the free-radical and mitochondrial theories of aging. Both theories speculate that cumulative damage to mitochondria and mitochondrial DNA (mtDNA) caused by reactive oxygen species (ROS) is one of the causes of aging. Oxidative damage affects replication and transcription of mtDNA and results in a decline in mitochondrial function which in turn leads to enhanced ROS production and further damage to mtDNA. In this paper, we will present the current understanding of the interplay between ROS and mitochondria and will discuss their potential impact on aging and age-related diseases.
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            Trends of male factor infertility, an important cause of infertility: A review of literature

            Infertility and problems of impaired fecundity have been a concern through ages and is also a significant clinical problem today, which affects 8–12% of couples worldwide. Of all infertility cases, approximately 40–50% is due to “male factor” infertility and as many as 2% of all men will exhibit suboptimal sperm parameters. It may be one or a combination of low sperm concentration, poor sperm motility, or abnormal morphology. The rates of infertility in less industrialized nations are markedly higher and infectious diseases are responsible for a greater proportion of infertility. The present literature will help in knowing the trends of male factor infertility in developing nations like India and to find out in future, various factors that may be responsible for male infertility.
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              Oxidation of biological systems: oxidative stress phenomena, antioxidants, redox reactions, and methods for their quantification.

              Reactive oxygen species (ROS) and other radicals are involved in a variety of biological phenomena, such as mutation, carcinogenesis, degenerative and other diseases, inflammation, aging, and development. ROS are well recognized for playing a dual role as deleterious and beneficial species. The objectives of this review are to describe oxidative stress phenomena, terminology, definitions, and basic chemical characteristics of the species involved; examine the biological targets susceptible to oxidation and the defense mechanisms of the organism against these reactive metabolites; and analyze methodologies, including immunohistochemical markers, used in toxicological pathology in the visualization of oxidative stress phenomena. Direct detection of ROS and other free radicals is difficult, because these molecules are short-lived and highly reactive in a nonspecific manner. Ongoing oxidative damage is, thus, generally analyzed by measurement of secondary products including derivatives of amino acids, nuclei acids, and lipid peroxidation. Attention has been focused on electrochemical methods based on voltammetry measurements for evaluating the total reducing power of biological fluids and tissues. This approach can function as a tool to assess the antioxidant-reducing profile of a biological site and follow changes in pathological situations. This review thus includes different topics essential for understanding oxidative stress phenomena and provides tools for those intending to conduct study and research in this field.
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                Author and article information

                Journal
                Investig Clin Urol
                Investig Clin Urol
                ICU
                Investigative and Clinical Urology
                The Korean Urological Association
                2466-0493
                2466-054X
                November 2017
                02 November 2017
                : 58
                : 6
                : 385-399
                Affiliations
                [1 ]American Center for Reproductive Medicine, Department of Urology, Cleveland Clinic, Cleveland, OH, USA.
                [2 ]Ohio University Heritage College of Osteopathic Medicine, Athens, OH, USA.
                Author notes
                Corresponding Author: Ashok Agarwal. American Center for Reproductive Medicine, Department of Urology, Cleveland Clinic, 10681 Carnegie Avenue, Cleveland, OH 44195, USA. TEL: +1-216-444-9485, FAX: +1-216-444-9458, agarwaa@ 123456ccf.org
                Article
                10.4111/icu.2017.58.6.385
                5671957
                29124237
                e9d73063-3a1a-4f81-84e5-bd673176e405
                © The Korean Urological Association, 2017

                This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 04 September 2017
                : 15 October 2017
                Funding
                Funded by: American Center for Reproductive Medicine, Cleveland Clinic Foundation, Cleveland, OH, USA, CrossRef http://dx.doi.org/10.13039/100007312;
                Categories
                Review Article

                diagnosis,male infertility,oxidative stress,reactive oxygen species,spermatozoa

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