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Bombyx mori nucleopolyhedrovirus downregulates transcription factor BmFoxO to elevate virus infection.

Abstract：

:Forkhead-box O (FoxO) is the primary transcriptional effector of the insulin-like signaling pathway that enhances gluconeogenesis through transcriptional activation of PEPCK and G6Pase in mammals. We have previously demonstrated the involvement of phosphoenolpyruvate carboxykinase (BmPEPCK-2) in antiviral immunity against the multiplication of Bombyx mori nuclearpolyhedrosisvirus (BmNPV) in silkworm. Therefore, we speculated that BmFoxO might suppress BmNPV by regulating the expression of PEPCK in silkworm. In the present study, we found that the expression of BmFoxO decreased after BmNPV infection in Bombyx mori; this finding was consistent with BmPEPCK-2 expression. In addition, the expression of BmFoxO was altered, and it was found that reduced expression of BmFoxO (dsBmFoxO) downregulated the expression of BmPEPCK-2 and increased the viral fluorescence and content in silkworm embryonic cell line BmE cells, and vice versa. BmFoxO could upregulate the expression of BmPEPCK-2 by binding to the BmPEPCK-2 promoter. Moreover, overexpression of BmFoxO significantly increased the expression of autophagy genes ATG6/7/8 after infection with BmNPV, consistent with BmPEPCK-2. These results indicate that BmNPV downregulates transcription factor BmFoxO to elevate virus infection, and BmFoxO overexpression upregulates BmPEPCK-2 expression and enhances silkworm antiviral resistance.

journal_name

Dev Comp Immunol

journal_title

Developmental and comparative immunology

authors

Kang X,Wang Y,Liang W,Tang X,Zhang Y,Wang L,Zhao P,Lu Z

doi

10.1016/j.dci.2020.103904

subject

Has Abstract

pub_date

2021-03-01 00:00:00

pages

103904

eissn

0145-305X

issn

1879-0089

pii

S0145-305X(20)30459-6

journal_volume

116

pub_type

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