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URL: https://pubmed.ncbi.nlm.nih.gov/34745001/

⇱ Regulation of Angiotensin-Converting Enzyme 2: A Potential Target to Prevent COVID-19? - PubMed


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Abstract

The renin-angiotensin system (RAS) is crucially involved in the physiology and pathology of all organs in mammals. Angiotensin-converting enzyme 2 (ACE2), which is a homolog of ACE, acts as a negative regulator in the homeostasis of RAS. ACE2 has been proven to be the receptor of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which caused the coronavirus disease 2019 (COVID-19) pandemic. As SARS-CoV-2 enters the host cells through binding of viral spike protein with ACE2 in humans, the distribution and expression level of ACE2 may be critical for SARS-CoV-2 infection. Growing evidence shows the implication of ACE2 in pathological progression in tissue injury and several chronic conditions such as hypertension, diabetes, and cardiovascular disease; this suggests that ACE2 is essential in the progression and clinical prognosis of COVID-19 as well. Therefore, we summarized the expression and activity of ACE2 under various conditions and regulators. We further discussed its potential implication in susceptibility to COVID-19 and its potential for being a therapeutic target in COVID-19.

Keywords: COVID-19; SARS-CoV-2; angiotensin-converting enzyme 2; renin–angiotensin system; therapeutic target.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

👁 Figure 1
Figure 1
Renin–angiotensin system. Renin cleaves angiotensinogen to form Ang I, which is then cleaved by angiotensin-converting enzyme (ACE) to generate Ang II. Ang II can bind to Ang II type 1 and 2 receptors (AT1/2R). ACE2 is a single transmembrane protein, which can recognize Ang I and cleave it into Ang 1-9, which is quickly converted to Ang 1-7 by ACE. Moreover, Ang-(1-7) has been identified as a ligand for Mas receptor, which is a seven-transmembrane G-protein coupled receptor. Mas receptor may induce intracellular signaling cascades such as protein kinase B and induction of nitric oxide (NO) production.
👁 Figure 2
Figure 2
Roles of angiotensin-converting enzyme 2 (ACE2) in severe acute respiratory syndrome coronavirus (SARS-CoV) and SARS-CoV-2 infection. (A) ACE2 acts as the key receptor in avian influenza H5N1 and H7N9 virus infections as well as in SARS-CoV and SARS-CoV-2 infections. (B) Roles of a soluble form of angiotensin-converting enzyme 2 (sACE2) and A disintegrin and metalloprotease 17 (ADAM17) in cells infected with SARS-CoV and SARS-CoV-2. ADAM17 cleaves ACE2 and forms a 20-amino acid transmembrane peptide. The binding of Ang II with AT1R promotes sACE2 formation by increasing ADAM17 activity, which generates sACE2 and binds to the spike protein of SARS-CoV-2 as the virus receptor.

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