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Structure-Property Relationship Studies of Influenza A Virus AM2-S31N Proton Channel Blockers.
ACS Medicinal Chemistry Letters 2018 November 9
Majority of current circulating influenza A viruses carry the S31N mutation in their M2 genes, rendering AM2-S31N as a high profile antiviral drug target. With our continuous interest in developing AM2-S31N channel blockers as novel antivirals targeting both oseltamivir-sensitive and -resistant influenza A viruses, we report herein the structure-property relationship studies of AM2-S31N inhibitors. The goal was to identify lead compounds with improved microsomal stability and membrane permeability. Two lead compounds, 10d and 10e , were found to have high mouse and human liver microsomal stability ( T 1/2 > 145 min) and membrane permeability (>200 nm/s). Both compounds also inhibit both currently circulating oseltamivir-sensitive and -resistant human influenza A viruses (H1N1 and H3N2) with EC50 values ranging from 0.4 to 2.8 μM and a selectivity index of >100. We also showed for the first time that AM2-S31N channel blockers such as 10e inhibited influenza virus replication at both low and high multiply of infection (102 -106 pfu/mL) and the inhibition was not cell-type dependent. Overall, these studies have identified two promising lead candidates for further development as antiviral drugs against drug-resistant influenza A viruses.
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