The Chemokine CCL5 Inhibits the Replication of Influenza A Virus Through SAMHD1 Modulation
The Chemokine CCL5 Inhibits the Replication of Influenza A Virus Through SAMHD1 Modulation
Influenza A virus (IAV) is the main etiological agent of acute respiratory tract infections. During IAV infection, interferon triggers the overexpression of restriction factors (RFs), the intracellular antiviral branch of the innate immune system. Conversely, severe influenza is associated with an unbalanced pro-inflammatory cytokine release. It is unclear whether other cytokines and chemokines released during IAV infection modulate RFs to control virus replication. Among the molecules enhanced in the infected respiratory tract, ligands of the CCR5 receptor play a key role, as they stimulate the migration of inflammatory cells to the alveoli. We investigated here whether ligands of the CCR5 receptor could enhance RFs to levels able to inhibit IAV replication. For this purpose, the human alveolar basal epithelial cell line (A549) was treated with endogenous (CCL3, CCL4 and CCL5) or exogenous (HIV-1 gp120) ligands prior to IAV infection. The three CC-chemokines tested reduced infectious titers between 30% to 45% upon 24 hours of infection. Eploying RT-PCR, a panel of RF mRNA levels from cells treated with CCR5 agonists was evaluated, which showed that the SAMHD1 expression was up-regulated four times over control upon exposure to CCL3, CCL4 and CCL5. We also found that IAV inhibition by CCL5 was dependent on PKC and that SAMHD1 protein levels were also increased after treatment with CCL5. In functional assays, we observed that the knockdown of SAMHD1 resulted in enhanced IAV replication in A549 cells and abolished both CCL5-mediated inhibition of IAV replication and CCL5-mediated cell death inhibition. Our data show that stimuli unrelated to interferon may trigger the upregulation of SAMHD1 and that this RF may directly interfere with IAV replication in alveolar epithelial cells.
- Federal University of Rio de Janeiro Brazil
- Universidade Iguaçu Brazil
- UNIVERSITEIT LEIDEN Netherlands
- Leiden University Netherlands
- FIOCRUZ Brazil
CCL5/RANTES, Virus Replication, restriction factors, Microbiology, SAMHD1, QR1-502, SAM Domain and HD Domain-Containing Protein 1, Cellular and Infection Microbiology, Influenza A virus, Influenza, Human, Humans, influenza, CCR5, Chemokine CCL5
CCL5/RANTES, Virus Replication, restriction factors, Microbiology, SAMHD1, QR1-502, SAM Domain and HD Domain-Containing Protein 1, Cellular and Infection Microbiology, Influenza A virus, Influenza, Human, Humans, influenza, CCR5, Chemokine CCL5
3 Research products, page 1 of 1
- 2010IsAmongTopNSimilarDocuments
- 2008IsAmongTopNSimilarDocuments
- 2012IsAmongTopNSimilarDocuments
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).23 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 10% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 10%
