\\n\\n
Dr. Pletser’s experience includes 30 years of working with the European Space Agency as a Senior Physicist/Engineer and coordinating their parabolic flight campaigns, and he is the Guinness World Record holder for the most number of aircraft flown (12) in parabolas, personally logging more than 7,300 parabolas.
\\n\\nSeeing the 5,000th book published makes us at the same time proud, happy, humble, and grateful. This is a great opportunity to stop and celebrate what we have done so far, but is also an opportunity to engage even more, grow, and succeed. It wouldn't be possible to get here without the synergy of team members’ hard work and authors and editors who devote time and their expertise into Open Access book publishing with us.
\\n\\nOver these years, we have gone from pioneering the scientific Open Access book publishing field to being the world’s largest Open Access book publisher. Nonetheless, our vision has remained the same: to meet the challenges of making relevant knowledge available to the worldwide community under the Open Access model.
\\n\\nWe are excited about the present, and we look forward to sharing many more successes in the future.
\\n\\nThank you all for being part of the journey. 5,000 times thank you!
\\n\\nNow with 5,000 titles available Open Access, which one will you read next?
\\n\\nRead, share and download for free: https://www.intechopen.com/books
\\n\\n\\n\\n
\\n"}]',published:!0,mainMedia:null},components:[{type:"htmlEditorComponent",content:'
Preparation of Space Experiments edited by international leading expert Dr. Vladimir Pletser, Director of Space Training Operations at Blue Abyss is the 5,000th Open Access book published by IntechOpen and our milestone publication!
\n\n"This book presents some of the current trends in space microgravity research. The eleven chapters introduce various facets of space research in physical sciences, human physiology and technology developed using the microgravity environment not only to improve our fundamental understanding in these domains but also to adapt this new knowledge for application on earth." says the editor. Listen what else Dr. Pletser has to say...
\n\n\n\nDr. Pletser’s experience includes 30 years of working with the European Space Agency as a Senior Physicist/Engineer and coordinating their parabolic flight campaigns, and he is the Guinness World Record holder for the most number of aircraft flown (12) in parabolas, personally logging more than 7,300 parabolas.
\n\nSeeing the 5,000th book published makes us at the same time proud, happy, humble, and grateful. This is a great opportunity to stop and celebrate what we have done so far, but is also an opportunity to engage even more, grow, and succeed. It wouldn't be possible to get here without the synergy of team members’ hard work and authors and editors who devote time and their expertise into Open Access book publishing with us.
\n\nOver these years, we have gone from pioneering the scientific Open Access book publishing field to being the world’s largest Open Access book publisher. Nonetheless, our vision has remained the same: to meet the challenges of making relevant knowledge available to the worldwide community under the Open Access model.
\n\nWe are excited about the present, and we look forward to sharing many more successes in the future.
\n\nThank you all for being part of the journey. 5,000 times thank you!
\n\nNow with 5,000 titles available Open Access, which one will you read next?
\n\nRead, share and download for free: https://www.intechopen.com/books
\n\n\n\n
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Larsen, Catherine Croft Swanwick and Sharmila Banerjee- Basu",authors:[{id:"45742",title:"Dr.",name:"Eric",middleName:null,surname:"Larsen",fullName:"Eric Larsen",slug:"eric-larsen"}]},{id:"43446",title:"Genetic Etiology of Autism",slug:"genetic-etiology-of-autism",signatures:"Agnes Cristina Fett-Conte, Ana Luiza Bossolani-Martins and Patrícia Pereira-Nascimento",authors:[{id:"31969",title:"Prof.",name:"Agnes",middleName:"Cristina",surname:"Fett-Conte",fullName:"Agnes Fett-Conte",slug:"agnes-fett-conte"}]},{id:"43445",title:"Advances in Autism Research – The Genomic Basis of ASD",slug:"advances-in-autism-research-the-genomic-basis-of-asd",signatures:"Melanie Lacaria and James R. Lupski",authors:[{id:"163196",title:"Dr.",name:"James",middleName:"R.",surname:"Lupski",fullName:"James Lupski",slug:"james-lupski"},{id:"163198",title:"Dr.",name:"Melanie",middleName:null,surname:"Lacaria",fullName:"Melanie Lacaria",slug:"melanie-lacaria"}]},{id:"43441",title:"Autism Spectrum Disorders: Insights from Genomics",slug:"autism-spectrum-disorders-insights-from-genomics",signatures:"John J. Connolly and Hakon Hakonarson",authors:[{id:"158107",title:"Dr.",name:"John",middleName:null,surname:"Connolly",fullName:"John Connolly",slug:"john-connolly"}]},{id:"43440",title:"The Genetic Architecture of Autism and Related Conditions",slug:"the-genetic-architecture-of-autism-and-related-conditions",signatures:"Michael Gill, Graham Kenny and Richard Anney",authors:[{id:"155576",title:"Prof.",name:"Michael",middleName:null,surname:"Gill",fullName:"Michael Gill",slug:"michael-gill"},{id:"155695",title:"Dr.",name:"Richard",middleName:null,surname:"Anney",fullName:"Richard Anney",slug:"richard-anney"}]},{id:"43439",title:"Genetic and Environmental Factors in Autism",slug:"genetic-and-environmental-factors-in-autism",signatures:"Esra Guney and Elvan Iseri",authors:[{id:"44874",title:"Prof.",name:"Elvan",middleName:null,surname:"Iseri",fullName:"Elvan Iseri",slug:"elvan-iseri"},{id:"44984",title:"M.D.",name:"Esra",middleName:null,surname:"Guney",fullName:"Esra Guney",slug:"esra-guney"}]},{id:"43499",title:"Discovering the Genetics of Autism",slug:"discovering-the-genetics-of-autism",signatures:"Abdullah K. Alqallaf, Fuad M. Alkoot and Mash’el S. Aldabbous",authors:[{id:"42239",title:"Dr.",name:"Abdullah",middleName:null,surname:"Alqallaf",fullName:"Abdullah Alqallaf",slug:"abdullah-alqallaf"},{id:"158644",title:"Dr.",name:"Fuad",middleName:"M.",surname:"Alkoot",fullName:"Fuad Alkoot",slug:"fuad-alkoot"},{id:"158645",title:"Dr.",name:"Mashael",middleName:null,surname:"Aldabbous",fullName:"Mashael Aldabbous",slug:"mashael-aldabbous"}]},{id:"43435",title:"Co-Occurrence of Developmental Disorders: Children Who Share Symptoms of Autism, Dyslexia and Attention Deficit Hyperactivity Disorder",slug:"co-occurrence-of-developmental-disorders-children-who-share-symptoms-of-autism-dyslexia-and-attentio",signatures:"Ginny Russell and Zsuzsa Pavelka",authors:[{id:"33427",title:"Dr.",name:"Ginny",middleName:null,surname:"Russell",fullName:"Ginny Russell",slug:"ginny-russell"},{id:"167365",title:"Ms.",name:"Zsuzsa",middleName:null,surname:"Pavelka",fullName:"Zsuzsa Pavelka",slug:"zsuzsa-pavelka"}]},{id:"43433",title:"Pre-Existing Differences in Mothers of Children with Autism Spectrum Disorder and/or Intellectual Disability: A Review",slug:"pre-existing-differences-in-mothers-of-children-with-autism-spectrum-disorder-and-or-intellectual-di",signatures:"Jenny Fairthorne, Amanda Langridge, Jenny Bourke and Helen Leonard",authors:[{id:"158722",title:"Dr.",name:"Helen",middleName:null,surname:"Leonard",fullName:"Helen Leonard",slug:"helen-leonard"},{id:"163414",title:"Ph.D. Student",name:"Jenny",middleName:null,surname:"Fairthorne",fullName:"Jenny Fairthorne",slug:"jenny-fairthorne"},{id:"163416",title:"Dr.",name:"Amanda",middleName:null,surname:"Langridge",fullName:"Amanda Langridge",slug:"amanda-langridge"}]},{id:"43429",title:"Relationships, Sexuality, and Intimacy in Autism Spectrum Disorders",slug:"relationships-sexuality-and-intimacy-in-autism-spectrum-disorders",signatures:"Maria R. Urbano, Kathrin Hartmann, Stephen I. Deutsch, Gina M. Bondi Polychronopoulos and Vanessa Dorbin",authors:[{id:"32007",title:"Prof.",name:"Stephen",middleName:"I.",surname:"Deutsch",fullName:"Stephen Deutsch",slug:"stephen-deutsch"},{id:"41980",title:"Prof.",name:"Maria",middleName:null,surname:"Urbano",fullName:"Maria Urbano",slug:"maria-urbano"},{id:"157623",title:"Dr.",name:"Kathrin",middleName:null,surname:"Hartmann",fullName:"Kathrin Hartmann",slug:"kathrin-hartmann"},{id:"159397",title:"M.Sc.",name:"Gina Marie",middleName:"Bondi",surname:"Polychronopoulos",fullName:"Gina Marie Polychronopoulos",slug:"gina-marie-polychronopoulos"},{id:"160029",title:"Ms.",name:"Vanessa",middleName:null,surname:"Dorbin",fullName:"Vanessa Dorbin",slug:"vanessa-dorbin"}]},{id:"42286",title:"Clinical Implications of a Link Between Fetal Alcohol Spectrum Disorders (FASD) and Autism or Asperger’s Disorder – A Neurodevelopmental Frame for Helping Understanding and Management",slug:"clinical-implications-of-a-link-between-fetal-alcohol-spectrum-disorders-fasd-and-autism-or-asperger",signatures:"Kieran D. O’Malley, Susan D. Rich",authors:[{id:"155711",title:"Dr.",name:"Kieran D.",middleName:null,surname:"O'Malley",fullName:"Kieran D. O'Malley",slug:"kieran-d.-o'malley"}]},{id:"43427",title:"Autism Spectrum Disorders in People with Sensory and Intellectual Disabilities Symptom Overlap and Differentiating Characteristics",slug:"autism-spectrum-disorders-in-people-with-sensory-and-intellectual-disabilities-symptom-overlap-and-d",signatures:"Gitta De Vaan, Mathijs P.J. Vervloed, Harry Knoors and Ludo Verhoeven",authors:[{id:"156051",title:"M.Sc.",name:"Gitta",middleName:null,surname:"De Vaan",fullName:"Gitta De Vaan",slug:"gitta-de-vaan"},{id:"157224",title:"Dr.",name:"Mathijs",middleName:null,surname:"Vervloed",fullName:"Mathijs Vervloed",slug:"mathijs-vervloed"},{id:"166523",title:"Prof.",name:"Harry",middleName:null,surname:"Knoors",fullName:"Harry Knoors",slug:"harry-knoors"},{id:"166524",title:"Prof.",name:"Ludo",middleName:null,surname:"Verhoeven",fullName:"Ludo Verhoeven",slug:"ludo-verhoeven"}]},{id:"43421",title:"Empowering Families in the Treatment of Autism",slug:"empowering-families-in-the-treatment-of-autism",signatures:"Jennifer Elder",authors:[{id:"156987",title:"Dr.",name:"Jennifer",middleName:null,surname:"Elder",fullName:"Jennifer Elder",slug:"jennifer-elder"}]},{id:"43419",title:"Collaboration Between Parents of Children with Autism Spectrum Disorders and Mental Health Professionals",slug:"collaboration-between-parents-of-children-with-autism-spectrum-disorders-and-mental-health-professio",signatures:"Efrosini Kalyva",authors:[{id:"158901",title:"Dr.",name:"Efrosini",middleName:null,surname:"Kalyva",fullName:"Efrosini Kalyva",slug:"efrosini-kalyva"}]},{id:"43417",title:"Early Intensive Behavioural Intervention in Autism Spectrum Disorders",slug:"early-intensive-behavioural-intervention-in-autism-spectrum-disorders",signatures:"Olive Healy and Sinéad Lydon",authors:[{id:"156296",title:"Dr.",name:"Olive",middleName:null,surname:"Healy",fullName:"Olive Healy",slug:"olive-healy"}]},{id:"43414",title:"Feeding Issues Associated with the Autism Spectrum Disorders",slug:"feeding-issues-associated-with-the-autism-spectrum-disorders",signatures:"Geneviève Nadon, Debbie Feldman and Erika Gisel",authors:[{id:"157283",title:"Dr.",name:"Erika",middleName:"G",surname:"Gisel",fullName:"Erika Gisel",slug:"erika-gisel"},{id:"157379",title:"M.Sc.",name:"Genevieve",middleName:null,surname:"Nadon",fullName:"Genevieve Nadon",slug:"genevieve-nadon"}]},{id:"42649",title:"Clinical Approach in Autism: Management and Treatment",slug:"clinical-approach-in-autism-management-and-treatment",signatures:"Rudimar Riesgo, Carmem Gottfried and Michele Becker",authors:[{id:"31995",title:"Prof.",name:"Carmem",middleName:null,surname:"Gottfried",fullName:"Carmem Gottfried",slug:"carmem-gottfried"},{id:"43615",title:"Prof.",name:"Rudimar",middleName:null,surname:"Riesgo",fullName:"Rudimar Riesgo",slug:"rudimar-riesgo"},{id:"160959",title:"Dr.",name:"Michele",middleName:null,surname:"Becker",fullName:"Michele Becker",slug:"michele-becker"}]},{id:"43411",title:"Building an Alternative Communication System for Literacy of Children with Autism (SCALA) with Context-Centered Design of Usage",slug:"building-an-alternative-communication-system-for-literacy-of-children-with-autism-scala-with-context",signatures:"Liliana Maria Passerino and Maria Rosangela Bez",authors:[{id:"30773",title:"Dr.",name:"Liliana",middleName:"Maria",surname:"Passerino",fullName:"Liliana Passerino",slug:"liliana-passerino"},{id:"158812",title:"MSc.",name:"Maria Rosangela",middleName:null,surname:"Bez",fullName:"Maria Rosangela Bez",slug:"maria-rosangela-bez"}]},{id:"43408",title:"Addressing Communication Difficulties of Parents of Children of the Autism Spectrum",slug:"addressing-communication-difficulties-of-parents-of-children-of-the-autism-spectrum",signatures:"Fernanda Dreux Miranda Fernandes, Cibelle Albuquerque de La Higuera Amato, Danielle Azarias Defense-Netvral, Juliana Izidro Balestro and Daniela Regina Molini-Avejonas",authors:[{id:"28286",title:"Dr.",name:"Fernanda Dreux Miranda",middleName:null,surname:"Fernandes",fullName:"Fernanda Dreux Miranda Fernandes",slug:"fernanda-dreux-miranda-fernandes"},{id:"38598",title:"Dr.",name:"Cibelle",middleName:null,surname:"Amato",fullName:"Cibelle Amato",slug:"cibelle-amato"},{id:"38599",title:"Prof.",name:"Daniela",middleName:null,surname:"Molini-Avejonas",fullName:"Daniela Molini-Avejonas",slug:"daniela-molini-avejonas"},{id:"158284",title:"MSc.",name:"Juliana",middleName:null,surname:"Balestro",fullName:"Juliana Balestro",slug:"juliana-balestro"},{id:"158286",title:"MSc.",name:"Danielle",middleName:null,surname:"Defense-Netvral",fullName:"Danielle Defense-Netvral",slug:"danielle-defense-netvral"}]},{id:"43407",title:"Early Intervention of Autism: A Case for Floor Time Approach",slug:"early-intervention-of-autism-a-case-for-floor-time-approach",signatures:"Rubina Lal and Rakhee Chhabria",authors:[{id:"28701",title:"Dr.",name:"Rubina",middleName:null,surname:"Lal",fullName:"Rubina Lal",slug:"rubina-lal"},{id:"158260",title:"Ms.",name:"Rakhee",middleName:null,surname:"Chhabria",fullName:"Rakhee Chhabria",slug:"rakhee-chhabria"}]},{id:"43405",title:"Early Communication Intervention for Children with Autism Spectrum Disorders",slug:"early-communication-intervention-for-children-with-autism-spectrum-disorders",signatures:"Gunilla Thunberg",authors:[{id:"31724",title:"Dr.",name:"Gunilla",middleName:null,surname:"Thunberg",fullName:"Gunilla Thunberg",slug:"gunilla-thunberg"}]},{id:"41296",title:"Atypical Sense of Self in Autism Spectrum Disorders: A Neuro- Cognitive Perspective",slug:"atypical-sense-of-self-in-autism-spectrum-disorders-a-neuro-cognitive-perspective",signatures:"Viktoria Lyons and Michael Fitzgerald",authors:[{id:"28359",title:"Prof.",name:"Michael",middleName:null,surname:"Fitzgerald",fullName:"Michael Fitzgerald",slug:"michael-fitzgerald"},{id:"165744",title:"Dr.",name:"Viktoria",middleName:null,surname:"Lyons",fullName:"Viktoria Lyons",slug:"viktoria-lyons"}]},{id:"43403",title:"Critical Evaluation of the Concept of Autistic Creativity",slug:"critical-evaluation-of-the-concept-of-autistic-creativity",signatures:"Viktoria Lyons and Michael Fitzgerald",authors:[{id:"28359",title:"Prof.",name:"Michael",middleName:null,surname:"Fitzgerald",fullName:"Michael Fitzgerald",slug:"michael-fitzgerald"},{id:"165744",title:"Dr.",name:"Viktoria",middleName:null,surname:"Lyons",fullName:"Viktoria Lyons",slug:"viktoria-lyons"}]}]}]},onlineFirst:{chapter:{type:"chapter",id:"72704",title:"The Potential Role of Renin Angiotensin System (RAS) and Dipeptidyl Peptidase-4 (DPP-4) in COVID-19: Navigating the Uncharted",doi:"10.5772/intechopen.92837",slug:"the-potential-role-of-renin-angiotensin-system-ras-and-dipeptidyl-peptidase-4-dpp-4-in-covid-19-navi",body:'
Coronavirus (CoV) is a positive-sense single-strand RNA genome, which is the largest known RNA virus, constitutes Riboviria of Coronaviridae family and Orthocoronavirinae subfamily with a genome size of 27–34 kilobases. The name coronavirus is derived from the Latin word corona, meaning crown or halo, which is the feature appearance under electron microscope. Regarding COVID-19, it is similar to the other RNA viruses with additional endoribonuclease and exoribonuclease terminal caps (Figure 1) [1].
Structure of SARS-CoV2.
Formerly different researches were done to identify the cause of obscure respiratory tract infections. The identified novel agents were severe acute respiratory syndrome coronavirus (SARS-CoV) and human coronavirus NL63 (HCoV-NL63) [2] CoV causes human acute respiratory infection in about 5–30% of the total respiratory infection. In the past, between 2002 and 2003, an epidemic had been shown caused by SARS-CoV, which causes severe acute respiratory syndrome in 8000 subjects with 750 deaths. SARS-CoV is a second coronavirus group, while HCoV-NL63 is called group 1 coronavirus [3, 4].
On December 2019, a number of cases with a novel coronavirus (COVID-19) led to infected pneumonia in Wuhan in central China. Four cases with pneumonia of unknown etiology were reported on 29 December 2019, which heralds the similar outbreak of 2003 SARS-CoV [5].
At this time, no vaccines or effective antiviral agents are approved for the treatment or prevention of human COVID-19. Therefore, the emergence of COVID-19 is regarded as a priority by the World Health Organization (WHO), Center for Disease Control and Prevention (CDC), and health agencies for the developing a therapeutic effective drug against COVID-19. In general COVID-19 as other positive-sense RNA virus is characterized by high genetic plasticity and mutations due to short replication time, with a higher rate of recombination. These criteria limit and challenge for discovering novel antiviral agents [6, 7]. However, nucleotide and nucleoside analogue inhibitors (NIs) may be an effective agent by the reduction of genetic mapping of COVID-19 [8]. NIs such as ribavirin, remdesivir, and beta-D-N4-hydroxycytidine could be effective agents despite emergence of rapid resistance [9].
Previously, it has been reported by Li et al. [11] and Kuba et al. [10] that the entry-point receptor for SARS-CoV is angiotensin-converting enzyme 2 (ACE2) at the lung [10, 11]. Besides, Eckerle et al. reported that dipeptidyl peptidase-4 (DPP-4) which cluster of differentiation 26 (CD26) is widely expressed on the surface of human cells which acts as a receptor for Middle East respiratory syndrome coronavirus (MERS-CoV) [12]. Since there is a 80% similarity between MERS-CoV and SARS-CoV with SARS-CoV-2, this study was planned to review the potential link between the incidence and severity of COVID-19 regarding the modulation of DPP-4 and ACE2 by DPP-4 and renin angiotensin system (RAS) inhibitors, respectively.
In general, an endeavor of this study article was to present a mini review concerning DPP-4 and RAS and their inhibitors in relation to the incidence and severity of COVID-19. Evidences and substantiations from experimental, preclinical, and clinical studies are assessed, given the nature and character of the subject area; it remains clear that this literature search cannot be considered as a systemic review. A multiplicity and array of search policy took on and are assumed, which is integrated by electronic database searches of Scopus, Web of Science, Medline, Cochrane Central Register of Controlled Trials (CCTR), and PubMed using MeSH terms, keywords, and title words during the search. The terms used for these searches were as follows: COVID-19 or coronavirus or SARS-CoV-2 and DPP-4 OR renin angiotensin system; COVID-19 or SARS-CoV-2 and DPP-4 inhibitors or sitagliptin, vildagliptin, and insulin resistance; incidence of COVID-19 or coronavirus or SARS-CoV-2; and hypertension or orphan drugs or glucagone-like peptide 1 (GLP-1) or dipeptidyl peptidase-IV inhibitors (DPPIV) or thiazolidinediones (TZDs).
Reference lists of previous and recent notorious articles were reviewed. In addition, only English articles were measured, and case reports were also of concerned in this review. The key features of predictable and suitable search studies were considered, and the conclusions were summarized and summed up in a mini review.
RAS is a signaling pathway for the regulation of blood pressure, blood volume, natriuresis, and other vascular functions [13]. RAS consists of different effector peptides that control the dynamic vascular functions. Angiotensinogen from the liver is converted to angiotensin I (AngI), which is converted to angiotensin II (AngII) by angiotensin-converting enzyme 1(ACE1). AngII activates two types of receptors which are AT1 (vasoconstrictor) 90% and AT2 (vasodilator) 10%. The overall effect of AngII is vasoconstriction with sympathetic activation and aldosterone release. Excess of AngII is metabolized by ACE2 into vasodilator Ang (1–7) which act on specific receptor called MAS receptor (Figure 2). AngII can also be converted to angiotensin A by mononuclear leukocyte-derived aspartate decarboxylase (MLDAD), leading to the formation of alamandine, which has been shown to bind to the mas-related G protein-coupled receptor D [14].
Renin angiotensin system (RAS).
In COVID-19, SARS-CoV-2 binds ACE2 which is highly expressed by the epithelial cells of the blood vessel, intestine, and lung. The expression of ACE2 is augmented by angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin receptor blockers (ARBs) (Figure 3) [15] as well as ibuprofen and thiazolidinediones, and cigarette smoking also increases the expression of ACE2 at epithelial cells of the lung. Therefore, hypertensive patients on ACEIs or ARBs are at higher risk for COVID-19 [16, 17].
Role of angiotensin-converting enzyme 2 (ACE2).
Recently, Zhou et al. [18] found that the COVID-19 genome is 96% identical to the bat CoV, so spike glycoprotein (S protein) and receptor binding domain (RBD) of both SARS-CoV-2 and bat CoV bind ACE2, which might explain the cross-species transmission, which means from bat to human and from human to human [19]. In addition, the affinity of COVID-19-RBD to ACE2 is approximately 10–20 times more than that of SARS-CoV [20]. It has been shown that smoking upregulates ACE2 via activation of pulmonary platelet factor and induction of oxidative stress and inflammatory reactions. Increased ACE activity also contributes to impaired vascular relaxation observed in smokers. Irbesartan, an AT1R antagonist (also known as angiotensin receptor blocker), was found to reduce arterial stiffness in hypertensive patients. When stratified by smoking status, smokers were found to have stiffer arteries before treatment, and irbesartan was able to reduce arterial stiffness to a greater extent in smokers than in nonsmokers, indicating that overactivity of the RAS contributes to increased arterial stiffness in smokers. On the other hand, overexpression and upregulation of ACE2 is regarded as a protective measure via the reduction of pro-inflammatory cytokines mainly tumor necrosis factor (TNF-α) which is augmented in smoker subjects [21]. Therefore, active cigarette smoking subjects are at high risk for COVID-19 regardless of gender difference (Figure 4).
Nicotine smoking and ACE2.
The activity of RAS is high in the lung, which is the main source of circulating AngII due to higher expression of ACE. Lung ACE2 controls the balance of RAS activation through regulating AngII/Ang 1–7 ratio. Local pulmonary AngII provokes vascular permeability, causing pulmonary edema [22]. However, in acute respiratory distress syndrome (ARDS), the activation of RAS is necessary to maintain oxygenation since ACE2 knockout mice illustrated more sever pulmonary damage than the controls. Thereby, pulmonary ACE2 seems to be a protective defense pathway during ARDS [23]. In addition, ACE2 has an important anti-inflammatory action, and so ACE2 therapy is effective in the treatment of hypertension and diabetic nephropathy through attenuation of AngII-induced inflammation and oxidative stress [24]. Even so recombinant ACE2 is effective in the management of animal model ARDS, the inhibition of ACE2 may lead to fatal outcomes due to the reduction of vasodilator Ang1–7. However, chronic intravenous administration of Ang1–7 or MAS agonists leads to vasodilatation independent of circulating AngII levels [25].
Depending on these observations, different studies illustrate that RAS inhibitors might be of value in the reduction of ARDS, respiratory failure, and acute pneumonia that are induced by SARS-CoV-2 [26]. Though Wang [27] confirms that RAS inhibitors increase the risk of COVID-19 due to the upregulation of pulmonary ACE2, this study recommends stopping RAS inhibitors during COVID-19 outbreak. Nonetheless, all recruited patients with COVID-19 developed ARDS without any evidence of AKI [27]. Thus, RAS system mainly ACE2/Ang1–7 grows to be the focus and meeting point of different researches to implicate this pathway in the pathogenesis of COVID-19.
Guo et al. found that the expression of ACE2 is higher renal tubules than in lung tissues; nevertheless COVID-19 leads to ARDS in much at higher than that of acute kidney injury (AKI), suggesting other mechanism other than ACE2 binding in the pathogenesis of COVID-19 [28]. AT2 receptor is activated by ACE2 and Ang1–7 that oppose the activity of AT1 receptor [29]. Similarly, AT2 receptors are highly expressed in lung epithelial cells compared with kidney tissues. Pulmonary AT2 receptors mediate lung injury through the augmentation of pulmonary inflammation and vascular permeability as well as the development of pulmonary fibrosis [30]. Consequently, pulmonary AT2 receptor antagonists are regarded as a novel pathway in COVID-19-induced pneumonia and ARDS. This finding does not rule out the responsibility of ACE2, since the activation of ACE2 by SARS-CoV-2 causes considerable activation of pulmonary AT2 receptors (Figure 5).
Role of AT2 receptors in COVID-19.
Amid myriad literature survey, polymorphism of ACE2 has been associated with different cardio-metabolic disorders; thus, the implication of ACE2 and AT2 receptors in COVID-19-induced pneumonia should be considerably regarded with ACE2 polymorphisms [31]. Furthermore, the expression of ACE2 might not be necessary for COVID-19 infection and viral entry, as the absence of SARS-CoV-2 in some ACE2 expressing cell types as well; this infection was observed in some cell line lacking ACE2, suggesting a vague pathway, and cofactors might be necessary for human infection [32]. Amusingly, Gurwitz [33] animal model study shows that pulmonary COVID-19 infection leads to significant lung injury through the downregulation of ACE2, which is attenuated by the administration of ARB. This study suggests the protective role of RAS inhibitors in COVID-19-induced ARDS [33]. Indeed, most of reported data from various social media during this dangerous outbreak was not legitimate due to overwhelming lay press and sparked concerns. Therefore, the high incidence of COVID-19 in patients receiving ACEIs or ARBs might be not because of these drugs but because those patients were often older, hypertensive, or diabetic which in fact increase the risk of COVID-19 infection. In addition, a recent clinical trial on the effectiveness of recombinant ACE2 (rACE) in the management of COVID-19 infection has been started [34], and we are waiting for these results. Thus, according to the guideline for the management of hypertension, RAS inhibitors should be used irrespective of COVID-19 infection, as sudden withdrawal of these therapeutic regimens may increase the risk of deleterious outcomes in critically ill patients.
Regarding gender differences in the expression of ACE2, ACE2 gene is located on the X chromosome, which gives the possibility of gender differences in the susceptibility for COVID-19 infection. Females have lower levels of ACE2 compared with males, which gives a clue of male vulnerability to COVID-19 infection as compared with females [35]. In addition, Shenoy et al. report that estrogen attenuates AngII-induced pulmonary fibroblast proliferation due to the upregulation of ACE2 [36]. The expression of ACE2 is regulated by different endogenous hormones and peptides; both endothelin-1 and aldosterone downregulate ACE2 expression in a rat model. So, RAS inhibitors may improve ACE2 expression via suppression of endogenous endothelin-1 and aldosterone (Figure 6) [37].
Potential effects of endothelin-1 and aldosterone on the expression of ACE2.
Moreover, ACE2 contains ectodomain and endodomain at cytoplasmic membrane; the shedding part (ectodomain) is essential for the replication of SARS-CoV-2 (Figure 7) [38].
Shedding of ACE2 during SARS-CoV-2 entry.
At the heart of the dilemma, extensive researches are recommended to explore the specific role of ACE2 and RAS inhibitors during precarious COVID-19 worldwide outbreak.
DPP4, also called adenosine deaminase complexing protein 2 (ADCP2) or adenosine deaminase binding protein (ADBP), is widely distributed on the surface of human cells. DPP4 is involved in the regulation of blood glucose, oxidative stress, inflammation, immune system, cell adhesion, and apoptosis [39]. The substrates of DPP4 are glucagone-like peptide 1 (GLP-1), stromal cell-derived factor 1 (SDF-1), brain natriuretic peptide (BNP), substance P, and neuropeptide Y (NPY). Furthermore, DPP4 interacts with different ligands such as caveolin-1, chemokine receptor type 4 (CXCR4), adenosine deaminase (ADA), and fibronectin [40].
DPP4 inhibitors (DPP4i) such as sitagliptin, saxagliptin, and vildagliptin are approved in the management of type 2 diabetes mellitus (T2DM). Additionally, DPP4i have a potential therapeutic effect regarding hypertension, endothelial dysfunction, cardioprotection, and connective tissue diseases (Figure 8) [41].
Metabolic effects of DDP-4 inhibitors.
Regarding the role of DPP4 in viral entry and replication, Widagdo et al. [42] found that DPP4 is an important receptor for MERS-CoV transmission. DPP4 receptors are found in the human upper respiratory tract epithelium. Lacking of these receptors may restrict the transmission of MERS-CoV.
S protein of MERS-CoV binds specifically to DPP4 receptors. These interactions provoke proteolytic activation for viral entry and fusion of viral membrane with the cell membrane [43].
It has been observed that polymorphism in DPP4 gene is concerned with different cardio-metabolic disorders and transmission of MERS-CoV [44]. The polymorphism in DPP4 reduces the interactions between S proteins of MERS-CoV with cellular membranes. The difference in the incidence between Arabian and African MERS-CoV is mainly related to the genotype polymorphism of DPP4 [45].
Since there is a higher genomic similarity between SARS-CoV-2 and SARS-CoV, the implication of DPP4 as a receptor or a pathogenetic pathway in COVID-19-induced ARDS is reasonable. In COVID-19 infection, ARDS is developed due to massive cytokine release (cytokine storm), due to uncontrolled systemic inflammatory response, and due to the release of pro-inflammatory cytokine, including INF-α-, IL-6, IL-12, IL-33, etc., which cause multiple organ failure [46].
It has been reported that DPP4 is highly expressed on alveolar cells (type I and type II), alveolar macrophage, pleural mesothelium, and vascular endothelium. Besides, pulmonary vascular endothelial cells (PVECs) are the main source of pro-inflammatory cytokines in ARDS. DPP4 is upregulated in pneumonia, asthma, and ARDS; therefore, DPP4 inhibitors may reduce the inflammatory reaction and cytokine release in acute lung injury and ARDS through immune-modulation effect [47].
Different studies illustrated that DPP4 inhibitors inhibit the release of IL-6 and TNF-α in ARDS without effect on the blood glucose when used in a small dose [48]. Therefore, DPP4 inhibitors might be a therapeutic option in the management of COVID-19-induced ARDS.
DPP4 is involved in the activation of T-cell, so the activated T-cell can synthesize and secret AngII by local RAS. So, AngII-dependent T-cell activation is inhibited by DPP4i, leading to a significant reduction of endothelial inflammation and vasoconstriction [49]. Similarly, Bengsch et al. [50] disclosed that DPP4 receptors are highly expressed on Th17 which induced AngII release during ARDS. High circulating AngII level leads to the activation of inflammatory reactions via activation of the release of IL-18, 1 L-17, IL-6, and TNF-α. These mediators are essential for the induction of epithelial and endothelial cell injury during ARDS. DPP4i plays an integral role in the attenuation of IL-6 and TNF-α and associated inflammation and endothelial damage [51].
Therefore, DPP4i interferes with RAS at different levels; as teneligliptin attenuates AngII action, liraglutide downregulates AT1 and upregulates AT2 receptors during intravenous AngII infusion. Besides, exenatide inhibits the secretion of renin, AngII, and angiotensinogen [52].
What is more, DPP4i has a nephroprotective effect through the regulation of sodium and water reabsorption. Both DPP4i and GLP-1 increase sodium excretion through direct effect on proximal renal tubules or indirect effect via the activation of brain natriuretic peptide (BNP) (Figure 9) [53].
Metabolic effects of DDP-4 inhibitors regarding obesity and insulin resistance.
Consequently, DPP4i exerts protective effects on the lung and kidney which are the main tropism of COVID-19 through direct modulation of inflammatory reactions or indirectly through the attenuation of AngII. The interaction between DPP4i and RAS inhibitors seems to augment the expression of AT2 receptor which is under extensive researches to find the pathophysiological pathway of COVID-19 infection. Indeed, this interaction sheds light for possible attenuation of COVID-19-induced ARDS and AKI mainly in critically ill patients with systemic hypertension.
ACE2 is regarded as a portal entry-point for SARS-CoV-2; however, human cell lines with higher expression of ACE2 are not infected by this virus. The overexpression of AT2 receptors by ACE2 and Ang1–7 is regarded as a novel pathway in COVID-19-induced pneumonia and ARDS. Females have lower levels of ACE2 than males, which give a clue of male vulnerability to COVID-19 infection as compared with females. Even so, ACE2 is regarded as a protective pathway which reduces COVID-19-induced acute inflammatory reactions. RAS inhibitors and DPP4i increase the expression of pulmonary ACE2, so the implication of RAS inhibitors and DPP4i as augmenters of COVID-19 is not practical. Therefore, addition of, DPP4i to RAS inhibitors in hypertensive patients with COVID-19 may reduce the risk of ARDS and AKI.
Nil.
Nil.
IntechOpen's Authorship Policy is based on ICMJE criteria for authorship. An Author, one must:
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