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The in silico mechanism of hVKOR interaction with acetaminophen and its metabolite, as well as N-acetyl cysteine: caution on application in COVID-19 patients

Hashemi et al., Journal of Biomolecular Structure and Dynamics, doi:10.1080/07391102.2021.1910570
Apr 2021  
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14th treatment shown to reduce risk in February 2021
 
*, now with p = 0.000028 from 24 studies, recognized in 3 countries.
Lower risk for mortality, hospitalization, and cases.
No treatment is 100% effective. Protocols combine treatments. * >10% efficacy, ≥3 studies.
5,000+ studies for 104 treatments. c19early.org
In Silico study suggesting increased risk of cerebral hemorrhage with acetaminophen use for COVID-19. Authors show acetaminophen metabolite N-acetyl-p-benzoquinone imine (NAPQI), and to a lesser extent N-acetylcysteine (NAC), bind to human vitamin K epoxide reductase (hVKOR), interrupting the vitamin K reducing electron transfer pathway. Authors suggest that this may explain previous clinical reports of coagulopathy with chronic acetaminophen use, and considering the risk of coagulopathy in COVID-19, they recommend monitoring prothrombin time and international normalized ratio in COVID-19 patients taking acetaminophen and/or NAC.
9 preclinical studies support the efficacy of N-acetylcysteine for COVID-19:
NAC may be beneficial for COVID-19 by replenishing glutathione stores and reinforcing the glutathione peroxidase-4 pathway to inhibit ferroptosis, an oxidative stress-induced cell death pathway implicated in COVID-199. N-acetylcysteine shows dose-dependent inhibition of SARS-CoV-23,6,8, shows anti-inflammatory and immunomodulatory effects against SARS-CoV-2-induced immune responses in combination with bromelain5, suppressed virus-induced reactive oxygen species and blocked viral replication in a humanized mouse model and in human lung cells4, and may limit COVID-19 induced cardiac damage by boosting cellular antioxidant defenses and potentially mitigating the oxidative stress caused by spike protein-induced ROS production in cardiac fibroblasts10.
Study covers acetaminophen and N-acetylcysteine.
Hashemi et al., 20 Apr 2021, peer-reviewed, 3 authors. Contact: zbatha2000@yahoo.com, bathai_z@modares.ac.ir.
In Silico studies are an important part of preclinical research, however results may be very different in vivo.
This PaperN-acetylcys..All
Thein silicomechanism of hVKOR interaction with acetaminophen and its metabolite, as well as N-acetyl cysteine: caution on application in COVID-19 patients
S Ali Hashemi, Armita Kyani, S Zahra Bathaie
Journal of Biomolecular Structure and Dynamics, doi:10.1080/07391102.2021.1910570
Acetaminophen and N-acetyl cysteine (NAC) are being used as supportive care in patients suffering from coronavirus disease 2019 . The coagulopathy and cerebral hemorrhage have been recently reported in these patients. Prolonged acetaminophen use increases the international normalized ratio (INR) and the risk of bleeding among patients taking anti-coagulants. Inhibition of vitamin K epoxide reductase (VKOR) by acetaminophen and NAC in chronic applications has been reported, however, detailed knowledge of the molecular mechanism and binding sites are not clear. Herein, we built the homology model of human VKOR (hVKOR) using ITASSER server, confirmed, and applied it for docking analysis of its interaction with acetaminophen and its metabolite, N-acetyl-p-benzoquinone imine (NAPQI), and NAC. We also calculated the lipophilicity and predicted the blood-brain-barrier (BBB) permeation of NAPQI by Swiss ADME. Our analysis showed that NAPQI and NAC, but not acetaminophen, bind strongly to the similar sites in hVKOR via both hydrogen and van der Waals bonding; particularly with Cys135. Thus, it interrupted the vitamin K reducing electron transfer pathway. Further, molecular dynamic (MD) simulation study revealed that the interactions of the ligands with hVKOR are stable. In conclusion, our analysis shed a light on the molecular mechanism of acetaminophen-induced coagulopathy previously reported in some clinical cases with chronic acetaminophen use. Furthermore, considering the anti-coagulopathy of NAPQI and NAC but not acetaminophen, the BBB permeation potency of these agents, and the risk of coagulopathy in COVID-19, we suggest a regular prothrombin time (PT) and INR monitoring of these patients taking acetaminophen and/or NAC.
Disclosure statement The authors claim that there is no conflict of interest.
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