Deciphering underlying mechanism of Sars-CoV-2 infection in humans and revealing the therapeutic potential of bioactive constituents from Nigella sativa to combat COVID19: in-silico study

Abstract

COVID-19, emerged at the end of 2019 have dramatically threatened the health, economy, and social mobility of people around the world and till date no medication is available for its treatment. An amazing herb, Nigella sativa, having antiviral, antihypertensive, anti- diarrhoeal, analgesics, and anti-bacterial properties, needs to be explored for its efficacy against SARS-CoV-2, the causative agent of COVID-19. In-silico studies were carried out to understand the role of its bioactive constituents in COVID-19 treatment and prevention. Firstly, the disease network was prepared by using ACE2 (Angiotensin-II receptor), as it is the entry site for virus. It was used to decipher the mechanism of SARS-COV-2 infection in humans. Second, the target receptors for N. sativa were predicted and protein interaction studies were conducted. Further, docking studies were also performed to analyse it for treatment purpose as well. This study concludes that pathways undertaken by N. sativa bioactive constituents were similar to the pathways followed in SARS-COV-2 pathology, like renin-angiotensin system, kidney functions, regulation of blood circulation, blood vessel diameter , etc. Also, in docking studies, the constituents of N. sativa, α-hederin, Thymohydroquinone and Thymoquinone were observed to be efficiently binding to ACE2. Also, the bioactive phytoconstituents are involved in molecular pathways like HIF1, VEGF, IL-17, AGE-RAGE, chemokine and calcium signaling pathways which can be majorly helpful in combating hypoxia and inflammation caused due to compromised immune system and oxidative stress. Therefore, N. sativa standardized extract having the above phytoconstituents could be useful in COVID-19 and hence opens a new treatment line.