| Budget Amount *help |
¥16,770,000 (Direct Cost: ¥12,900,000、Indirect Cost: ¥3,870,000)
Fiscal Year 2013: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2012: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2011: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
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| Research Abstract |
Apoptosis serves as the major anti-viral defense mechanism in baculovirus-infected lepidopteran insect cells. In the present study, we examined molecular mechanisms underlying induction and inhibition of apoptosis that occur in insect cells upon infection with nucleopolyhedroviruses (NPVs). We cloned a number of cDNAs of cellular and viral factors, which possibly function in the apoptotic pathways, from several NPVs and insect cells. These include cellular factors Dronc, Caspase-1s, IAPs, P53, Reaper and Sirt2, and viral factors Apsup and IAPs. Through functional analysis of these factors in transient expression experiments, we provide several important insights into regulation mechanisms of apoptosis induction and inhibition in NPV-infected insect cells. We also demonstrated that IAP1 inhibits Dronc activation and promotes degradation of activated Dronc to prevent apoptosis induction in non-apoptotic insect cells.
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