Simulation of COVID-19 Symptoms in a Genetically Engineered Mouse Model

Abstract The ongoing infectious viral disease pandemic (also known as the coronavirus disease-19; COVID-19) by a constantly emerging viral agent commonly referred as the severe acute respiratory syndrome corona virus 2 or SARS-CoV-2 has revealed unique pathological findings from infected human beings, and the postmortem observations. The list of disease symptoms, and post-mortem observations is too long to mention; however, a few notable ones are worth mentioning to put into a perspective in understanding the malignity of this pandemic starting with respiratory distress or dyspnea, chest congestion, muscle or body aches, malaise, fever, chills, etc. We opine that further improvement for delivering highly effective treatment, and preventive strategies would be benefited from validated animal disease models. In this context, we designed a study and show that a genetically engineered mouse expressing the human angiotensin converting enzyme 2; hACE2 (the receptor used by SARS-CoV-2 agent to enter host cells) represents an excellent investigative resource in simulating important clinical features of the COVID-19 infection. The hACE2 mouse model (which is susceptible to SARS-CoV-2) when administered with a recombinant SARS-CoV-2 spike (S) protein intranasally exhibited a profound cytokine storm capable of altering the physiological parameters including significant changes in in vivo cardiac function along with multi-organ damage that was further confirmed via histological findings. More importantly, visceral organs from SARS-CoV-2 spike (S) treated mice revealed thrombotic blood clots as seen during postmortem examination of the mice. Thus, the hACE2 engineered mouse appears to be a suitable model for studying intimate viral pathogenesis paving the way for further identification, and characterization of appropriate prophylactics as well as therapeutics for COVID-19 management.