scholarly journals Innate Immunity in Children and the Role of ACE2 Expression in SARS-CoV-2 Infection

2021 ◽  
Vol 13 (3) ◽  
pp. 363-382
Author(s):  
Mario Dioguardi ◽  
Angela Pia Cazzolla ◽  
Claudia Arena ◽  
Diego Sovereto ◽  
Giorgia Apollonia Caloro ◽  
...  
Keyword(s):  
Innate Immunity ◽  
Viral Infections ◽  
Respiratory Infections ◽  
Viral Disease ◽  
Receptor Expression ◽  
Virus Infections ◽  
Search Terms ◽  
Bibliographic Search ◽  
Meta Analyses

COVID-19 (Coronavirus Disease 2019) is an emerging viral disease caused by the coronavirus SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2), which leads to severe respiratory infections in humans. The first reports came in December 2019 from the city of Wuhan in the province of Hubei in China. It was immediately clear that children developed a milder disease than adults. The reasons for the milder course of the disease were attributed to several factors: innate immunity, difference in ACE2 (angiotensin-converting enzyme II) receptor expression, and previous infections with other common coronaviruses (CovH). This literature review aims to summarize aspects of innate immunity by focusing on the role of ACE2 expression and viral infections in children in modulating the antibody response to SARS-CoV-2 infection. This review was conducted using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Articles deemed potentially eligible were considered, including those dealing with COVID-19 in children and providing more up-to-date and significant data in terms of epidemiology, prognosis, course, and symptoms, focusing on the etiopathogenesis of SARS-CoV-2 disease in children. The bibliographic search was conducted using the search engines PubMed and Scopus. The following search terms were entered in PubMed and Scopus: COVID-19 AND ACE2 AND Children; COVID-19 AND Immunity innate AND children. The search identified 857 records, and 18 studies were applicable based on inclusion and exclusion criteria that addressed the issues of COVID-19 concerning the role of ACE2 expression in children. The scientific literature agrees that children develop milder COVID-19 disease than adults. Milder symptomatology could be attributed to innate immunity or previous CovH virus infections, while it is not yet fully understood how the differential expression of ACE2 in children could contribute to milder disease.

scholarly journals Immunological Aspects Related to Viral Infections in Severe Asthma and the Role of Omalizumab

Biomedicines ◽  
2021 ◽  
Vol 9 (4) ◽  
pp. 348
Author(s):  
Francesco Menzella ◽  
Giulia Ghidoni ◽  
Carla Galeone ◽  
Silvia Capobelli ◽  
Chiara Scelfo ◽  
...  
Keyword(s):  
Innate Immunity ◽  
Severe Asthma ◽  
Viral Infections ◽  
Respiratory Infections ◽  
Antiviral Effect ◽  
Point Of View ◽  
Type I ◽  
Effector Cells ◽  
Viral Spread ◽  
Increased Risk

Viral respiratory infections are recognized risk factors for the loss of control of allergic asthma and the induction of exacerbations, both in adults and children. Severe asthma is more susceptible to virus-induced asthma exacerbations, especially in the presence of high IgE levels. In the course of immune responses to viruses, an initial activation of innate immunity typically occurs and the production of type I and III interferons is essential in the control of viral spread. However, the Th2 inflammatory environment still appears to be protective against viral infections in general and in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infections as well. As for now, literature data, although extremely limited and preliminary, show that severe asthma patients treated with biologics don’t have an increased risk of SARS-CoV-2 infection or progression to severe forms compared to the non-asthmatic population. Omalizumab, an anti-IgE monoclonal antibody, exerts a profound cellular effect, which can stabilize the effector cells, and is becoming much more efficient from the point of view of innate immunity in contrasting respiratory viral infections. In addition to the antiviral effect, clinical efficacy and safety of this biological allow a great improvement in the management of asthma.

The role of host cell Rab GTPases in influenza A virus infections

2021 ◽  
Author(s):  
Jing Wu ◽  
Jiaqi Gu ◽  
Li Shen ◽  
Xiaonan Jia ◽  
Yiqian Yin ◽  
...  
Keyword(s):  
Influenza A Virus ◽  
Influenza A ◽  
Respiratory Infections ◽  
Small Gtpase ◽  
Regulatory Mechanisms ◽  
Rab Proteins ◽  
Rab Gtpases ◽  
Virus Infections ◽  
Adaptation Mechanisms

Influenza A virus (IAV) is a crucial cause of respiratory infections in humans worldwide. Therefore, studies should clarify adaptation mechanisms of IAV and critical factors of the viral pathogenesis in human hosts. GTPases of the Rab family are the largest branch of the Ras-like small GTPase superfamily, and they regulate almost every step during vesicle-mediated trafficking. Evidence has shown that Rab proteins participate in the lifecycle of IAV. In this mini-review, we outline the regulatory mechanisms of different Rab proteins in the lifecycle of IAV. Understanding the role of Rab proteins in IAV infections is important to develop broad-spectrum host-targeted antiviral strategies.

scholarly journals Frequency of human bocavirus respiratory infections among at-risk patients in São Paulo, Brazil

2012 ◽  
Vol 54 (6) ◽  
pp. 307-310 ◽  
Author(s):  
Elaine Regina Baptista Caccia ◽  
Aripuana Sakurada Aranha Watanabe ◽  
Emerson Carraro ◽  
Elcio Leal ◽  
Celso Granato ◽  
...  
Keyword(s):  
At Risk ◽  
Respiratory Infections ◽  
Tertiary Hospital ◽  
Marrow Transplant ◽  
Human Bocavirus ◽  
Virus Infections ◽  
Risk Patients ◽  
Adults And Children ◽  
Respiratory Virus Infections

BACKGROUND AND OBJECTIVES: Human Bocavirus (HBoV) has been described since 2005 as an etiological agent of respiratory virus infections. From 2001 to 2008 we investigated the etiology of HBoV among adults and children in different groups at risk of presenting complications arising from acute respiratory infection, the investigation was carried out in a tertiary hospital health care system in Brazil. METHODS: HBoV DNA was assayed in 598 respiratory samples from community and hospitalized patients by PCR. RESULTS: Of the 598 tested samples, 2.44% (8/328) of children, including five children with heart disease, and 0.4% (1/270) of adult bone-marrow-transplant were HBoV positive. CONCLUSIONS: These data suggested lower HBoV frequency among different at-risk patients and highlights the need to better understand the real role of HBoV among acute respiratory symptomatic patients.

scholarly journals Emerging Role of l-Dopa Decarboxylase in Flaviviridae Virus Infections

Cells ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 837 ◽  
Author(s):  
Frakolaki ◽  
Kalliampakou ◽  
Kaimou ◽  
Moraiti ◽  
Kolaitis ◽  
...  
Keyword(s):  
Viral Replication ◽  
Viral Infections ◽  
Physiological Role ◽  
Inverse Correlation ◽  
Dopa Decarboxylase ◽  
Hcv Rna ◽  
Virus Infections ◽  
Peripheral Tissues ◽  
Functional Complex

l-dopa decarboxylase (DDC) that catalyzes the biosynthesis of bioactive amines, such as dopamine and serotonin, is expressed in the nervous system and peripheral tissues, including the liver, where its physiological role remains unknown. Recently, we reported a physical and functional interaction of DDC with the major signaling regulator phosphoinosite-3-kinase (PI3K). Here, we provide compelling evidence for the involvement of DDC in viral infections. Studying dengue (DENV) and hepatitis C (HCV) virus infection in hepatocytes and HCV replication in liver samples of infected patients, we observed a negative association between DDC and viral replication. Specifically, replication of both viruses reduced the levels of DDC mRNA and the ~120 kDa SDS-resistant DDC immunoreactive functional complex, concomitant with a PI3K-dependent accumulation of the ~50 kDa DDC monomer. Moreover, viral infection inhibited PI3K-DDC association, while DDC did not colocalize with viral replication sites. DDC overexpression suppressed DENV and HCV RNA replication, while DDC enzymatic inhibition enhanced viral replication and infectivity and affected DENV-induced cell death. Consistently, we observed an inverse correlation between DDC mRNA and HCV RNA levels in liver biopsies from chronically infected patients. These data reveal a novel relationship between DDC and Flaviviridae replication cycle and the role of PI3K in this process.

The Protective Mechanism of Cannabidiol in Cardiac Injury: A Systematic Review of Non-Clinical Studies

2019 ◽  
Vol 25 (22) ◽  
pp. 2499-2507 ◽  
Author(s):  
Mohammad R.H. Shayesteh ◽  
Hamed Haghi-Aminjan ◽  
Mohammad J. Mousavi ◽  
Saeideh Momtaz ◽  
Mohammad Abdollahi
Keyword(s):  
Oxidative Stress ◽  
Clinical Studies ◽  
Cardiac Injury ◽  
Pleiotropic Effect ◽  
Protective Mechanism ◽  
Search Terms ◽  
Cardioprotective Effects ◽  
Apoptosis And Inflammation ◽  
Meta Analyses

Background: Cardiac disease is accounted as the leading cause of worldwide morbidity and mortality. The disease is characterized by the overproduction of reactive oxygen and/or nitrogen species (ROS/RNS), and induction of oxidative stress. Cannabidiol (CBD) is a non-psychoactive ingredient of marijuana that has been reported to be safe and well tolerated in patients. Due to its pleiotropic effect, CBD has been shown to exert cytoprotective effects. This study intended to clarify the mechanisms and the potential role of CBD regarding cardiac injuries treatment. Methods: A systematic literature search was conducted, according to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, in the electronic databases including PubMed, Web of Science, Scopus, and Embase up to June 2019 using predefined search terms in the titles and abstracts. Accordingly, a set of pre-specified inclusion and exclusion criteria were considered and 8 articles were ultimately included in this study. Results: Our findings demonstrate that CBD has multi-functional protective assets to improve cardiac injuries; preliminary through scavenging of free radicals, and reduction of oxidative stress, apoptosis, and inflammation. Conclusion: CBD can protect against cardiac injuries, mainly through its antioxidative and antiapoptotic effects on the basis of non-clinical studies. The cardioprotective effects of the CBD need to be further studied in welldesigned clinical trials.

Immunity, microbiome and probiotics in viral infections

2021 ◽  
pp. 61-71
Author(s):  
Raphael Iosifovich Rosenson
Keyword(s):  
Antibacterial Agents ◽  
Viral Infections ◽  
Respiratory Infections ◽  
Hpv Infection ◽  
Human Organism ◽  
Relevant Issue ◽  
Positive Role ◽  
Age Related ◽  
Early Use

Currently, studying the role of microbiome in the realization of antiviral mechanisms is a relevant issue, especially in the context of the COVID-19 pandemic. It is known that microbiome disrupts the life cycle of viruses in the human organism cells at different stages and stimulates both innate and specific immune response. Such factors as delivery by cesarean section, artificial feeding of a child, early use of antibacterial agents, age-related changes lead to the development of dysbiosis, which increases the body’s susceptibility to viral infections. A positive role of probiotics use is observed in a range of viral infections, including HIV, HPV infection, viral hepatitis, respiratory infections and a number of other diseases.

Glucose-Insulin-Potassium Solution for Acute Myocardial Infarction

2002 ◽  
Vol 36 (6) ◽  
pp. 1080-1084 ◽  
Author(s):  
Jeffrey L Janiger ◽  
Judy WM Cheng
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
English Language ◽  
Duration Of Treatment ◽  
Data Synthesis ◽  
Mortality And Morbidity ◽  
Search Terms ◽  
Study Selection ◽  
Meta Analyses

OBJECTIVE: To review the role of glucose-insulin-potassium (GIK) solution in the management of acute myocardial infarction (AMI). DATA SOURCES: MEDLINE (1966–October 2001) database, using the search terms glucose, insulin, potassium, and myocardial infarction. STUDY SELECTION: Relevant English-language human studies and meta-analyses. DATA SYNTHESIS: Most studies that have investigated the use of GIK in AMI have been from the prethrombolytic era. Although most data trended toward favoring GIK in improving mortality and morbidity of AMI, the Polish GIK study was terminated prematurely because of an increase in mortality in patients treated with GIK. Dosage, duration of treatment, and route of administration of GIK varied among studies. CONCLUSIONS: Until results from larger-scale studies become available, the routine use of GIK infusion in AMI patients is not recommended.

scholarly journals Comparison of rates of hospitalization between single and dual virus detection in a Mexican cohort of children and adults with influenza-like illness

2019 ◽  
Author(s):  
Daniel E Noyola ◽  
Sally Hunsberger ◽  
Raydel Valdés Salgado ◽  
John H Powers ◽  
Arturo Galindo-Fraga ◽  
...  
Keyword(s):  
Viral Infections ◽  
Respiratory Infections ◽  
Simultaneous Detection ◽  
Virus Detection ◽  
Clinical Information ◽  
Detection Methods ◽  
Acute Respiratory Infections ◽  
Virus Infections ◽  
Influenza Like Illness ◽  
Syncytial Virus

Abstract Background Molecular detection methods allow for the simultaneous detection of several infectious agents. This study assesses whether co-infection with two viruses as compared to one is associated with increased hospitalization in those with acute respiratory infections. Methods We prospectively enrolled a cohort of pediatric and adult participants with influenza-like illness during 2010-2014 in Mexico. Clinical information and respiratory samples were collected at enrollment. Respiratory viruses were detected with multiplex PCR and influenza specific RT-PCR assays. Participants were followed-up 14 and 28 days after inclusion. Severity of disease as measured by hospitalization with acute respiratory infections was compared between single and dual viral infections. Results Among 5,662 participants in the study, either one (n=3,285) or two (n=641) viruses were detected in 3,926 participants. Rhinovirus (n=1,433), influenza (n=888), and coronaviruses (n=703) were the most frequently detected viruses (either alone or in co-infection). Bocavirus, respiratory syncytial virus (RSV), metapneumovirus, and rhinovirus cases were hospitalized more often than other viruses. Bocavirus+rhinovirus cases were hospitalized more often than those with rhinovirus alone (but not bocavirus alone). RSV cases were more likely to be hospitalized than cases with co-infections of RSV and parainfluenza virus or coronavirus. Metapneumovirus cases were hospitalized more often than those co-infected with metapneumovirus+coronavirus. Conclusions In this study, detection of two viruses did not significantly increase hospitalizations compared with single virus infections. Larger studies will allow for distinguishing between sequential and simultaneous infection as well as for a better understanding of the role of each virus during the evolution of acute respiratory episodes.

scholarly journals A case of recurrent herpes simplex 2 encephalitis, VZV reactivations, and dominant partial interferon-gamma-receptor-1 deficiency supports relevance of IFNgamma for antiviral defense in humans

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Julia Körholz ◽  
Nicole Richter ◽  
Jochen Schäfer ◽  
Catharina Schuetz ◽  
Joachim Roesler
Keyword(s):  
Herpes Simplex ◽  
Interferon Gamma ◽  
Viral Infections ◽  
Viral Disease ◽  
Antiviral Defense ◽  
Case Presentation ◽  
Gamma Receptor ◽  
Recurrent Herpes ◽  
Increased Susceptibility

Abstract Background Unlike infections with mycobacteria, reports of unusual viral infections in interferon-gamma-receptor (IFNγR) deficient patients are scarce. Therefore, discussion about increased susceptibility to viral infections in these patients is ongoing. Case presentation We describe a 51-year-old male with dominant partial interferon-gamma-receptor-1 (IFNγR1)-deficiency and recurrent Herpes simplex 2 meningoencephalitis as well as other viral reactivations since childhood. Conclusions This case further confirms an enhanced risk for viral disease in IFNγR-deficient patients and a role of interferon gamma for human antiviral defense.

scholarly journals Possible role of vitamin D supplementation in coronavirus disease 2019

2020 ◽  
Vol 6 (9) ◽  
pp. 376
Author(s):  
Devi Dayal
Keyword(s):  
Vitamin D ◽  
Viral Infections ◽  
Respiratory Infections ◽  
Winter Season ◽  
Vitamin D Supplementation ◽  
Vitamin D Status ◽  
Vitamin D Levels ◽  
Respiratory Viral Infections ◽  
The Impact

<p>Vitamin D deficiency (VDD) is presumed to play a role in several infective and non-infective conditions such as acute respiratory infections, tuberculosis, diabetes, hypertension, stroke etc. Most of the respiratory viral infections occur during winter season when the vitamin D levels in most individuals are generally low. The current pandemic of coronavirus disease 2019 (COVID-19) which began during winter season similar to the previous epidemics due to coronaviruses, has again stirred a debate on the role of VDD in the initiation and spread of the pandemic. The data on vitamin D status in patients with COVID-19 is however lacking. Different vitamin D supplementation strategies have recently been suggested as part of several countermeasures aimed at reducing the impact of COVID-19 pandemic. This brief narrative review discusses the evidence for the link between VDD and COVID-19 and the approaches suggested for vitamin D supplementation.</p>

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