|Budget Amount *help
¥46,150,000 (Direct Cost: ¥35,500,000、Indirect Cost: ¥10,650,000)
Fiscal Year 2011: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
Fiscal Year 2010: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
Fiscal Year 2009: ¥19,630,000 (Direct Cost: ¥15,100,000、Indirect Cost: ¥4,530,000)
We found that type II membrane bound serine proteases MSPL/ TMPRSS13 are essential cellular factors for entry into cells of the highly pathogenic avian influenza(HPAI) viruses. To confirm the evidence, we have made TPMRSS13 KO mice and challenged the viruses to the animals. Viral multiplication of the HPAI viruses with the hemagglutinin(HA) cleavage site sequence RKKR partially and the sequence KKKR was completely suppressed in the TPMRSS13 KO mice. The results indicate that MSPL/ TMPRSS13 are essential for the entry of the HPAI virus. Furthermore, we found that viral infection stimulates the influenza. cytokine. protease cycle and the cycle plays an important role in the pathogenicity of multiple organ failure induced by infection.