The Renin Angiotensin System: Insights into the Role of ACE2 in Glomerular Injury Including SARS-CoV-2 Infection

The circulating renin–angiotensin–aldosterone system (RAAS) plays a key role in regulating blood volume and electrolyte levels. While important for the maintenance of intravascular volume systemically, the local activation of tissue RAAS and the generation of angiotensin II contribute to inflammation and fibrosis. In the kidney, angiotensin II plays a key role in the development and progression of glomerular injury. Angiotensin-converting enzyme 2 (ACE2), an enzyme that degrades angiotensin II, is expressed in the glomerulus, focusing attention not only on the complexity of the RAAS but also identifying a potential new determinant of glomerular injury. Accordingly, we performed a narrative review using the search terms ACE2 and glomerulus in PubMed and Google Scholar to summarize the current understanding of the role of ACE2 in glomerular injury. We also discuss the role of ACE2 as a cellular receptor for SARS-CoV-2 and the potential impact of this function on glomerular injury in the setting of COVID-19.