<i></i>Dengue virus induces PCSK9 expression to alter antiviral responses and disease outcomes

Esther S. Gan; Hwee Cheng Tan; Huynh Le Thi Duyen; Huynh Trung Trieu; Bridget Wills; Nabil G. Seidah; Eng Eong Ooi; Sophie Yacoub

doi:10.1172/JCI137536

Dengue virus induces PCSK9 expression to alter antiviral responses and disease outcomes

First published July 9, 2020 - More info

Dengue virus (DENV) infection requires cholesterol as a pro-viral factor although statin treatment did not show antiviral efficacy in dengue patients. Here, we show that DENV infection manipulates cholesterol metabolism in cells residing in low oxygen microenvironments (hypoxia) such as the liver, spleen and lymph nodes. DENV infection induced proprotein convertase subtilisin/kexin type 9 (PCSK9), which reduces low-density lipoprotein receptor (LDLR) recycling and hence cholesterol uptake. We found that, whereas LDLR uptake would have distributed cholesterol throughout the various cell compartments, de novo cholesterol synthesis enriched this lipid in the endoplasmic reticulum (ER). With cholesterol enrichment in the ER, ER-resident STING and type-I interferon (IFN) activation were repressed during DENV infection. Our in vitro findings were further supported by the finding of elevated plasma PCSK9 levels in dengue patients with high viremia and increased severity of plasma leakage. Our findings thus suggest PCSK9 plays a hitherto unrecognized role in dengue pathogenesis and therefore PCSK9 inhibitors could be a suitable host-directed treatment for dengue patients.

Dengue virus induces PCSK9 expression to alter antiviral responses and disease outcomes

Esther S. Gan,¹ Hwee Cheng Tan,¹ Huynh Le Thi Duyen,² Huynh Trung Trieu,² Bridget Wills,² Nabil G. Seidah,⁴ Eng Eong Ooi,³ and Sophie Yacoub²

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Dengue virus induces PCSK9 expression to alter antiviral responses and disease outcomes

Esther S. Gan,1 Hwee Cheng Tan,1 Huynh Le Thi Duyen,2 Huynh Trung Trieu,2 Bridget Wills,2 Nabil G. Seidah,4 Eng Eong Ooi,3 and Sophie Yacoub2

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Esther S. Gan,¹ Hwee Cheng Tan,¹ Huynh Le Thi Duyen,² Huynh Trung Trieu,² Bridget Wills,² Nabil G. Seidah,⁴ Eng Eong Ooi,³ and Sophie Yacoub²