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2016 ; 6
(ä): 27732
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Six Hours after Infection, the Metabolic Changes Induced by WSSV Neutralize the
Host s Oxidative Stress Defenses
#MMPMID27279169
Chen IT
; Lee DY
; Huang YT
; Kou GH
; Wang HC
; Chang GD
; Lo CF
Sci Rep
2016[Jun]; 6
(ä): 27732
PMID27279169
show ga
Levels of intracellular ROS (reactive oxygen species) were significantly
increased in hemocytes collected from WSSV-infected shrimp within the first
30-120?min after infection. Measurement of the NADPH/NADP(+) and GSH/GSSG ratios
revealed that after a significant imbalance toward the oxidized forms at 2 hpi,
redox equilibrium was subsequently restored. Meanwhile, high levels of lactic
acid production, elevated NADH/NAD(+) ratios, and metabolic changes in the
glycolysis pathway show that the Warburg effect was triggered by the virus. The
timing of these changes suggests that WSSV uses this metabolic shift into aerobic
glycolysis to counteract the high levels of ROS produced in response to viral
infection. We further show that if the Warburg effect is inhibited by chemical
inhibition of the PI3K-Akt-mTOR signaling pathway, or if the pentose phosphate
pathway is chemically inhibited, then in both cases, the production of
intracellular ROS is sustained. We conclude that WSSV uses the
PI3K-Akt-mTOR-regulated Warburg effect to restore host redox balance and to
counter the ROS produced by the host in response to WSSV infection. We also found
that pyruvate kinase activity was inhibited by WSSV. This inhibition is likely to
increase the availability of the raw materials essential for WSSV gene expression
and replication.