Abstract
In cases of severe infectious and inflammatory disorders, pathological manifestations are the result of complex biological phenomena including a surge of cytokines/chemokines and overproduction of nitric oxide and other reactive oxygen species. High levels of these reactive species can attack various substrates in the body and can contribute to the development of acute and chronic disorders. The use of specific biomarkers for measurement of oxidative damage affecting tissues and organs has been introduced into the field of pediatric medicine. This chapter presents a review of the medical literature, including the authors’ clinical experiences, describing the use of these biomarkers in infectious and inflammatory disorders of children. The findings suggest that oxidative stress is likely to contribute to the progression and amplification of the inflammatory response related to the disorders. The use of these biomarkers in cerebrospinal fluid samples is expected to be especially important for the evaluation and management of purulent meningitis and acute encephalopathy. In children with purulent meningitis, markers of oxidative injury increase in relation with disease severity and occurrence of neurological complications. Dexamethasone is beneficial in the early treatment of purulent meningitis, probably through its potent antioxidative and anti-inflammatory effects. In children with influenza encephalopathy, the mortality rate decreased from about 30 to 7 % in Japan, along with the wide spread of multidisciplinary treatments including pulse steroid therapy, high-dose immunoglobulin, an antioxidative agent (edaravone), and plasma exchange. Combinations of antioxidants with antimicrobial drugs might present promising treatment options to ameliorate severe forms of infectious and inflammatory disorders in children.
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Keywords
- Nitric Oxide
- Respiratory Syncytial Virus
- Total Antioxidant Capacity
- Pulse Steroid Therapy
- Acute Encephalopathy
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
1 Introduction
Reactive species with nitrogen-based or oxygen-based unpaired electrons appear to play diverse roles in many aspects of physiological and pathological events in the pediatric field [1]. This is readily evident in infectious and inflammatory disorders such as sepsis, meningitis, encephalopathy, pneumonia, gastritis, enterocolitis, urinary infection, skin infection, burn injury, and immune activation syndromes.
Nitric oxide (NO), produced endogenously in cells and tissues of various types [2, 3], is a biological messenger molecule involved in numerous homeostatic processes. Constitutive isoenzymes of nitric oxide synthase (NOS) contribute to important physiological processes such as vasorelaxation and neurotransmission. Inducible NOS, which is expressed in various cells including macrophages, neutrophils, epithelial cells, endothelial cells, and hepatocytes, produces excessive NO in infectious and inflammatory conditions. Furthermore, reactive oxygen species (ROS) including superoxide (O −2 ), hydrogen peroxide (H2O2), and hydroxyl radical (OH) are produced through enzymes such as xanthine oxidoreductase and NADPH oxidases by infiltrating phagocytic cells and resident cells in inflamed tissues. Many effects of NO and O −2 might be mediated by their reaction product peroxynitrite (ONOO−). These reactive species, which have antimicrobial actions via their cytotoxic or cytostatic effects, contribute to innate (nonspecific) and immunological host defenses.
It is necessary to mention that NO and ROS act as a double-edged sword, having both beneficial and deleterious effects in biological systems [1–3]. They can attack various substrates in the body including lipids, proteins, nucleic acids, and carbohydrates. Oxidation of any of these substances, if unchecked, can contribute to the development of acute and chronic disorders. Biomarker research in this field can help guide the selection, efficiency, and sufficiency of medical interventions for pathological states that are characterized by the enhanced generation of NO and ROS [1].
This chapter presents a review of the medical literature and discusses the pathophysiological roles of NO and ROS in infectious and inflammatory disorders of children. It provides a detailed explanation of some devastating conditions affecting the brain (i.e., purulent meningitis and encephalopathy). We hope that this chapter will foster further investigation into the mechanisms by which oxidative stress influences the progression of these disorders, and that it will suggest potential therapeutic measures.
2 Oxidative Stress Biomarkers
Results of recent studies implicate oxidative stress in various acute and chronic disorders of children [1]. Accordingly, it is important to evaluate the stress conditions objectively and non-invasively in this population.
Any biomolecule can be damaged by NO and ROS. Direct measurement of these species is difficult because of their short half-life. Therefore, stress conditions are evaluated by measuring stable products of the oxidative modification processes in vivo [1]. Oxidative stress is also evaluated by measuring the consumption or induction of certain enzymes or antioxidants. Measurement of specific biomarkers in blood or urine enables repeated monitoring of systemic oxidative stress status, which is not possible with invasive tests. Clinically applicable and reliable biomarkers are presented in Table 22.1.
The first category (a) includes molecules that are generated in reactions with NO and ROS. They are subjected to either scission, cross-linking, or covalent modification in these reactions. Accordingly, the amount of these molecules is increased when ROS is generated excessively. Some are removed or repaired rapidly, but others remain in the body for a long time. Major targets of NO and ROS in the molecular components of the cells are membrane lipids, proteins, nucleic acids, and carbohydrates.
The second category (b) includes antioxidative enzymes and molecules that are associated with NO and ROS metabolism. In most cases, these molecules are destroyed or modified and exhibit decreased activity or quantity. Conversely, they often show an overshooting response for a period of hours, days, or weeks.
3 Infectious and Inflammatory Disorders Associated with Oxidative Stress
Numerous infectious and inflammatory disorders appear to be linked to oxidative damage attributable to NO and ROS in their pathogenesis and progression [1]. In most studies, oxidative stress biomarkers were determined in samples of blood (such as whole blood serum, plasma, erythrocytes, and leukocytes) or urine [4–36] (Table 22.2). In other studies, the parameters were measured using tissues or different body fluids, either alone or in combination with samples of blood or urine. The results are the following: higher levels of myeloperoxidase (MPO) and inducible NO synthase in rectal tissue in cholera [8]; higher leukocyte levels and lower urinary levels of 8-hydroxy-2′-deoxyguanosine (8-OHdG) in Helicobacter pylori infection [37]; higher levels of malondialdehyde (MDA) and catalase in tonsillar and adenoid tissue in chronic adenotonsillitis [38]; lower “total antioxidant capacity (TAC)” in saliva in human immunodeficiency virus (HIV) infection [39]; higher 8-isoprostane, carbonyl protein, and glutathione peroxidase (GPX) in bronchoalveolar lavage fluid in postinfectious bronchiolitis obliterans [40]; and higher MDA and 8-isoprostane in nasopharyngeal secretion in hypoxic respiratory syncytial virus (RSV) bronchiolitis [41]. The results for cerebrospinal fluid (CSF) examination are presented in the next section.
Recently, enzyme-linked immunosorbent assay (ELISA) systems have been constructed for various stress biomarkers [11, 26, 40, 41]. Onerous pretreatments and expensive apparatus are virtually obviated by ELISA, which is a labor-saving, cost-saving method [42]. Examination using a few sample aliquots is possible. Furthermore, compact machines by which serum/plasma total hydroperoxides (TH) and “TAC” [24, 33, 36, 43] or urinary 8-OHdG [44] can be measured are available. These machines provide highly reproducible results quickly.
It is noteworthy that oxidative damage might take place in a selective manner. For instance, lipid peroxidation and oxidative DNA damage are not always accompanied by overproduction of NO. Detection of more than one marker is an important key because a single marker might yield misleading results. It might also be crucial to determine which particular markers, alone or in combination with others, can serve as a precise indicator of the contribution of oxidative stress to a disease, thereby allowing the success (or failure) of the treatment to be monitored.
4 Biomarkers in CSF
Purulent meningitis and acute encephalopathy are severe central nervous system (CNS) disorders that can result in sudden death or development of neurological sequelae [45, 46]. These diseases, which are not rare in children, persist as an important public health problem worldwide.
Computed tomography and magnetic resonance imaging might be useful to evaluate the severity of brain injury, but it is often difficult to perform such radiological examinations during the critical period when key therapeutic decisions are made. Therefore, assessing ongoing brain injury and predicting outcomes using CSF samples is extremely valuable. These markers might be of various kinds, including cytokines/chemokines (such as tumor necrosis factor-α, interleukins-1β, -6, -8, -10, -13, granulocyte colony-stimulating factor, monocyte chemotactic protein-1, macrophage inflammatory protein-1, transforming growth factor-β, interferon-γ, interferon-γ-inducible protein-10), brain injury marker (S-100B protein, neuron-specific enolase, glial fibrillary acidic protein, neurofilaments, tau protein), tissue degradation enzymes (matrix metalloproteinases-8, -9), and oxidative stress markers (as described below).
The brain is regarded as vulnerable to free radical damage because of high oxygen consumption, in addition to its consequent generation of high levels of NO and ROS, high contents of unsaturated lipids and cellular iron, and weakened antioxidant defense system [47]. Oxidative stress is a predisposing factor for neuronal destruction in meningitis and encephalopathy, and for neuronal degeneration in developmental brain disorders [48].
Measurement of oxidative stress biomarkers in CSF samples has been introduced into the pediatric field. These markers presumably permit sequential biological monitoring of the CNS of the patients. Clinically applicable CSF markers are the following: lipid hydroperoxides, MDA, acrolein, TH, 8-OHdG, nitrite/nitrate, bilirubin oxidative metabolites (BOM), and TAC [17, 29, 49–62]. All these markers have also been determined in blood or urine samples for evaluation of systemic oxidative stress status (Table 22.2). ELISA [53, 54, 62] and rapid analysis methods [50, 57, 58, 60, 61] are applied to practice in CSF analyses.
5 Acute Purulent Meningitis
Acute purulent meningitis is a severe bacterial infection of the CNS that occurs especially in children younger than 5 years of age. Although the introduction of antibiotics has made it curable, mortality and morbidity from the disease remain high [46, 63]. The mortality rate is about 5 %. Long-term morbidity, consisting mainly of persistent neurological sequelae, is about 20 %.
It is apparent that the excessive host immune response is incapable of controlling infection within the CNS, particularly the CSF within the subarachnoid space, and that this host inflammatory response contributes to many adverse events that can occur during purulent meningitis [63]. A complex series of events involving host cytokines/chemokines, proteolytic enzymes, and NO/ROS is responsible for meningitis-induced brain damage, at least during the early phase of the disease (Fig. 22.1).
In this section, we highlight the ROS-mediated brain damage and antioxidant defenses in pediatric patients with acute purulent meningitis. Previous results for the CSF analyses from the patients are presented in Table 22.3 [29, 31, 49–54, 58]. They show enhanced production of NO and ROS in the CNS of patients with purulent meningitis compared with those with aseptic meningitis as well as non-meningitis subjects. The pathogenic bacteria were Streptococcus pneumoniae, Haemophilus influenzae, Group B streptococcus, and others. These findings also suggest the contribution of elevated oxidative stress to disease severity and occurrence of neurological complications [29, 31, 49, 51, 52, 58]. Our earlier observations [53, 54], which are presented in Fig. 22.2, suggest that clinical and laboratory improvement is linked closely to the decrease in oxidant activation in CNS.
The pathological hallmark of purulent meningitis is the dense inflammatory infiltrates in the subarachnoid and ventricular spaces, predominantly composed of neutrophils. Activated neutrophils secrete proteolytic enzymes and liberate NO and ROS. Excessive NO and ROS can exert various cytotoxic effects through lipid peroxidation, DNA strand breakage, mitochondrial damage, or potassium channel activity alterations [63, 64]. Oxidative alterations to vital macromolecules are observed in brain samples (most prominently in blood vessels and inflammatory cells) of patients who have died of meningitis [64, 65].
The presence of increased CSF levels of BOM in children with purulent meningitis is noteworthy here [54]. The levels were nearly eight times higher in these patients than in individuals of the non-meningitis group (Fig. 22.2). That significant increase of BOM is assumed to be attributable to local or systemic high production of bilirubin, mainly reflecting the overexpression of inducible heme oxygenase (HO) [66]. The HO induction and the subsequent bilirubin biosynthesis might be part of a common defense mechanism aimed at reducing oxidative brain injury in several neurological conditions [67].
Corticosteroids are beneficial for the early treatment of both human and experimental purulent meningitis [68]. Dexamethasone attenuates neuronal tissue damage by intervening at various levels of meningeal inflammatory cascade (Fig. 22.1). The proposed neuroprotective mechanisms include inhibition of ROS production, lipid peroxidation, leukocyte-endothelial interaction, and of transcription of various proinflammatory cytokines and inducible NOS. Dexamethasone treatment significantly lowered the nitrite concentration in the CSF of purulent meningitis children compared with those of non-treated children on the second day of the disease [52]. An additional piece of evidence for the beneficial effects of dexamethasone on purulent meningitis might be reduction in the levels of 8-OHdG, acrolein, and nitrite as the patients started to recover from the disease [53, 54] (Fig. 22.2).
Studies in rats have provided substantial evidence that antioxidant therapy (such as N-acetyl-l-cysteine, phenyl tert-butyl nitrone, and Mn(III) tetrakis(4-benzoic acid) porphyrin) is protective against vascular, cortical, and cochlear injury in pneumococcal meningitis [63, 64]. The adjunctive use of these antioxidants appears to offer promising future treatment options for purulent meningitis in humans.
6 Acute Encephalopathy
Acute encephalopathy is a severe CNS complication of common infections (such as influenza, exanthem subitum, and acute viral gastroenteritis) with high mortality and neurological sequelae [69]. As explained in previous sections, assessing brain injury and predicting outcomes using bedside point-of-care testing is valuable in these patients.
Here, we briefly highlight the ROS-mediated brain damage and antioxidant defenses in children with acute encephalopathy. Previous results for the CSF analyses from the patients are described in Table 22.4 [55–57, 59–62]. They indicate enhanced production of NO and ROS in the CNS of children with acute encephalopathy compared with those of non-encephalopathy subjects. These reports described the pathogenic viruses of influenza, enterovirus, RSV, and other viruses. Pleocytosis and high protein levels in CSF were found only occasionally in the patients. It remains to be clarified whether the NO/ROS production levels are related to the development of sequelae because available data in this research area remain limited.
It is noteworthy that in influenza encephalopathy patients, the increase of CSF NO levels was linked to the low serum zinc levels [56]. Trace elements are micronutrients that are present in small amounts in the body and which are necessary for the normal functioning of immune and antioxidant systems. The role of micronutrients in the pathogenesis, course, and outcome of encephalopathy warrants further study.
Stratification of acute encephalopathy is important clinically. Strategies for severe encephalopathy should be established in the near future. Prevention (or modulation) of excessive host inflammatory response including NO/ROS release, a possible therapeutic approach, is explained in the following section.
7 Redox Modulation Strategy for Influenza Encephalopathy
Influenza-associated acute encephalopathy (IAE) is an abrupt disorder of the CNS triggered by influenza virus infection, often engendering severe sequelae or death [70]. The Centers for Disease Control and Prevention have regarded IAE as an important public health problem at least since 2003, citing our report on IAE [71]. The 2009 pandemic influenza A (H1N1) virus emerged in Mexico in April 2009, thereafter spreading rapidly worldwide. In June 2009, The World Health Organization declared that the spreading novel influenza virus constituted a global pandemic. IAE of severe type also occurred following the 2009 pandemic influenza [72, 73].
Because influenza virus infection occurs predominantly in younger generations, great concern has arisen in relation to the severity of complications, such as IAE or severe pneumonia, among children [70]. Pathological findings, including the lack of viral antigen and sparse, if any, inflammatory infiltrates in the brain, imply that direct viral invasion and subsequent inflammation are unlikely to cause this encephalopathy. A prevailing theory is that excessive host inflammatory response characterized by massive production of pro-inflammatory cytokines/chemokines and NO/ROS and excessive apoptosis exacerbate IAE [74–79]. As a consequence, widespread vascular endothelial activation, dysfunction, and damage occur, ultimately resulting in multiple organ failure and death (Fig. 22.3).
In Japan, the guideline for diagnosis and management of pediatric IAE was formulated in 2005 by the collaborating study group on IAE, which was organized by the Japanese Ministry of Health, Labour, and Welfare. Dr. Morishima (an author of this chapter) has been the supervisor of the study since its inception. The guideline has been used widely among general and pediatric hospitals in our country. In addition to neuraminidase inhibitors, pulse steroid therapy, high-dose immunoglobulin, antioxidative agent (edaravone), coagulation modifying agent (thrombomodulin), plasma exchange, and hypothermia are listed as selectable treatments for severe IAE. These treatments are expected to impede excessive inflammatory host response and enhanced oxidative stress in the patients [57, 61, 78, 79] (Fig. 22.3).
For pediatric patients with IAE, the mortality rate was about 30 % in the pre-guideline era in Japan, when no efficient strategy had been proposed. Thereafter, the mortality rate decreased to about the one-fourth along with the nationwide distribution of this practical guideline (Fig. 22.4). Nevertheless, the incidence of poor outcomes of pediatric IAE has not been ideally low: 7 % for death and about 20 % for neurological sequelae. More global studies using edaravone and/or other antioxidants with sequential monitoring of oxidative stress biomarkers must be conducted to identify more effective strategies for IAE of severe type.
8 Summary and Conclusions
Infectious and inflammatory disorders are common and often severe in young generations. Severe forms of these disorders are occasionally fatal or leave severe sequelae, for which effective treatment is currently either insufficient or unavailable. The excessive host response and enhanced oxidative stress are inferred to play an important role in the progression and deterioration of these disorders.
Nitric oxide and ROS are unstable molecules produced by various cells and tissues. Using biomarkers will be of great importance for the diagnosis and management of infectious and inflammatory disorders. Those levels are expected to reflect the severity of clinical illness and to predict long-term consequences (if appropriately efficient strategies are not selected). Measurement of oxidative stress biomarkers in CSF samples is especially valuable in patients with purulent meningitis and acute encephalopathy.
Anti-oxidative strategies represent a potential adjunctive and an effective approach to ameliorate these disorders in the pediatric field. Determination of these parameters might identify the disease state and enhance the timing of therapeutic approaches in future medical applications.
Abbreviations
- BOM:
-
Bilirubin oxidative metabolites
- CNS:
-
Central nervous system
- CSF:
-
Cerebrospinal fluid
- ELISA:
-
Enzyme-linked immunosorbent assay
- GPX:
-
Glutathione peroxidase
- HIV:
-
Human immunodeficiency virus
- HO:
-
Heme oxygenase
- IAE:
-
Influenza-associated acute encephalopathy
- MDA:
-
Malonaldehyde
- MPO:
-
Myeloperoxidase
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthase
- 8-OHdG:
-
8-hydroxy-2′-deoxyguanosine
- ROS:
-
Reactive oxygen species
- RSV:
-
Respiratory syncytial virus
- SOD:
-
Superoxide dismutase
- TAC:
-
Total antioxidant capacity
- TH:
-
Total hydroperoxides
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Tsukahara, H., Yashiro, M., Nagaoka, Y., Morishima, T. (2014). Infectious and Inflammatory Disorders. In: Tsukahara, H., Kaneko, K. (eds) Studies on Pediatric Disorders. Oxidative Stress in Applied Basic Research and Clinical Practice. Springer, New York, NY. https://doi.org/10.1007/978-1-4939-0679-6_22
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