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TMC353121 is a RSV fusion inhibitor. It has been developed from the precursor molecule JNJ-2408068 using a molecular modelling approach. It maintains high activity (pEC50 9.9) and low cytotoxicity, while presenting a shorter retention time in the lung (lung t1/2 25 h). [1]

TMC353121 was found to inhibit RSV by preventing both virus cell fusion and syncytia formation by causing a local disturbance of the natural six-helix bundle conformation of RSV-F protein.

TMC353121 reduces viral load in therapeutic and prophylactic administration. TMC353121 has potent antiviral properties in vivo in a BALB/c mice model and protects against lung infection and virus-induced inflammation.[2]

TMC353121 had dose-dependent antiviral activity, which varied from 1log10 reduction of

peak viral load to complete inhibition of the RSV replication. TMC353121 (0.39 μg/mL) can completely inhibit the shedding of RSV. And a dose-dependent reduction of INFγ, IL6 and MIP1α was associated. TMC353121 administered as CI for 16 days was generally well-tolerated. [3]

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