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ACE2, the Counter-Regulatory Renin-Angiotensin System Axis and COVID-19 Severity.

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TLDR
In this article, the relationship between ACE2 expression and function in the lungs and other organs and COVID-19 severity was discussed and the effect of ACE2 upregulation with renin-angiotensin-aldosterone system inhibitors (RAASi) counterbalances the risks due to counterregulatory RAS axis amplification.
Abstract
Angiotensin (ANG)-converting enzyme (ACE2) is an entry receptor of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that causes coronavirus disease 2019 (COVID-19). ACE2 also contributes to a deviation of the lung renin-angiotensin system (RAS) towards its counter-regulatory axis, thus transforming harmful ANG II to protective ANG (1-7). Based on this purported ACE2 double function, it has been put forward that the benefit from ACE2 upregulation with renin-angiotensin-aldosterone system inhibitors (RAASi) counterbalances COVID-19 risks due to counter-regulatory RAS axis amplification. In this manuscript we discuss the relationship between ACE2 expression and function in the lungs and other organs and COVID-19 severity. Recent data suggested that the involvement of ACE2 in the lung counter-regulatory RAS axis is limited. In this setting, an augmentation of ACE2 expression and/or a dissociation of ACE2 from the ANG (1-7)/Mas pathways that leaves unopposed the ACE2 function, the SARS-CoV-2 entry receptor, predisposes to more severe disease and it appears to often occur in the relevant risk factors. Further, the effect of RAASi on ACE2 expression and on COVID-19 severity and the overall clinical implications are discussed.

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Citations
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Counter-regulatory renin-angiotensin system in hypertension: Review and update in the era of COVID-19 pandemic

TL;DR: In this article , the authors summarize the latest insights into the complexity and interplay of the counter-regulatory RAS axis in hypertension, highlight the pathophysiological functions of ACE2, a multifunctional molecule linking hypertension and COVID-19, and discuss the function and therapeutic potential of targeting this counterregulatory rAS axis to prevent and treat hypertension in the context of the current COVID19 pandemic.
References
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A high-throughput screen for TMPRSS2 expression identifies FDA-approved compounds that can limit SARS-CoV-2 entry.

TL;DR: In this paper, the authors identify small molecules that reduce surface expression of TMPRSS2 using a library of 2,560 FDA-approved or current clinical trial compounds and identify homoharringtonine and halofuginone as the most attractive agents.
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COVID-19 and cancer registries: learning from the first peak of the SARS-CoV-2 pandemic.

TL;DR: In this article, the authors collated the evidence from national and international studies and focus on the risk factors for patients with solid cancers and the contribution of systemic anti-cancer treatments (SACT-chemotherapy, immunotherapy, targeted and hormone therapy) to outcomes following SARS-Cov-2 infection.
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COVID-19 and the Renin-Angiotensin System.

TL;DR: A coronavirus disease leading to severe acute respiratory syndrome (SARS) started in China and has become a pandemic and the responsible virus has been designated SARS-CoV-2, a mostly membrane-bound homologue of angiotensin-converting enzyme (ACE) that has generated great interest in the interaction between COVID-19 and the renin-angiotens in system (RAS).
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Hypertension and renin-angiotensin system blockers are not associated with expression of angiotensin-converting enzyme 2 (ACE2) in the kidney.

TL;DR: Neither hypertension nor antihypertensive treatment is likely to alter the expression of the key entry receptor for SARS-CoV-2 in the human kidney, and renal abundance of ACE2 is positively associated with a biochemical index of kidney function.
Journal ArticleDOI

Therapeutic Targeting of Cancer Stem Cells via Modulation of the Renin-Angiotensin System

TL;DR: It is suggested that the presence of components of the RAS in CSCs could offer an avenue for therapeutic targeting using RAS modulators, and a systems approach using traditional RAS inhibitors in combination with inhibitors of bypass loops ofThe RAS and other signaling pathways that converge on the R AS may offer a novel therapeutic approach to cancer treatment.
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