Background:

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]

参考文献:
1. Bonfanti JF, Meyer C, Doublet F et al.  Selection of a respiratory syncytial virus fusion inhibitor clinical candidate. 2. Discovery of a morpholinopropylaminobenzimidazole derivative (TMC353121). J Med Chem. 2008; 51: 875–896.
2. Olszewska W1, Ispas G, Schnoeller C et al.  Antiviral and lung protective activity of a novel respiratory syncytial virus fusion inhibitor in a mouse model. Eur Respir J. 2011 Aug;38(2):401-8.
3. Ispas G, Koul A, Verbeeck J et al.  Antiviral Activity of TMC353121, a Respiratory Syncytial Virus (RSV) Fusion Inhibitor, in a Non-Human Primate Model. PLoS One. 2015 May 26;10(5):e0126959.