The Phosphatidylinositol 3-Kinase p110α/PTEN Signaling Pathway Is Crucial for HIV-1 Entry
The Phosphatidylinositol 3-Kinase p110α/PTEN Signaling Pathway Is Crucial for HIV-1 Entry
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DOI:
10.1248/bpb.b18-00801
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发表时间:
2019-01-01
影响因子:
2
通讯作者:
Okada, Seiji
中科院分区:
文献类型:
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作者:
Hamada, Koichi;Maeda, Yosuke;Okada, Seiji
Human immunodeficiency virus type 1 (HIV-1) drives multiple signaling pathways to facilitate its cellular entry and replication. The interaction between HIV-1 envelope (env) protein and target cell surface CD4 first activates the phosphatidylinositol 3-kinase (PI3K)/Akt signaling pathway, and the subsequent interaction between HIV-1 env glycoprotein and CCR5/CXCR4 coreceptors establishes viral fusion and entry. Four isoforms of the class-I PI3K catalytic subunits (p110 alpha, p110 beta, p110 gamma, and p110 delta) have been identified so far, but the isoform(s) involved in the HIV-1 entry is still unknown. This study aimed to identify the PI3K isoform(s) using recently developed isoform-specific inhibitors and the roles of their negative regulators, phosphatase and tensin homolog deleted on chromosome 10 (PTEN) and homology 2 domain-containing inositol-5-phosphatase 1 (SHIP!), in HIV-1 infection. We found that the PI3K p110a isoform-specific inhibitor PIK-75 suppressed HIV-1 entry in HIV-1 permissive T cells, PM! cells, and TZM-bl cells (HeLa cell-derived indicator cells that coexpress CD4, CCR5, and CXCR4) and decreased the HIV-1-induced phosphorylation of Akt. Moreover, wild-type PTEN (but neither phosphatase-deficient PTEN nor wild-type SHIP!) was a key regulator of HIV-1 entry. Cell-to-cell fusion by HIV-1 env-CD4 interaction was suppressed in the presence of PI3K p110 alpha-specific inhibitor. These data suggest that the PI3K p110 alpha/PTEN signaling pathway is indispensable for HIV-1 entry, including HIV-1 env-mediated cell-to-cell fusion.