Journal: Frontiers in Cellular and Infection Microbiology
Article Title: MicroRNAs as regulators of NLRP3 inflammasome activation in herpes simplex virus type 2 infection
doi: 10.3389/fcimb.2025.1602965
Figure Lengend Snippet: Schematic representation of the key signaling pathways involved in HSV-2-induced inflammation and pyroptosis: 1. HSV-2 Entry: Herpes Simplex Virus Type 2 (HSV-2) enters the host cell, initiating inflammatory responses. 2. Inflammasome Assembly: Upon HSV-2 infection, the miRNAs, miR-141 and miR-211 that target NLRP3 and CASP, are downregulated- a mechanism that may be crucial in facilitating the assembly of the inflammasome complex containing NLRP3, ASC, and Pro-Caspase-1. 3. Activation of Caspase-1: The assembled inflammasome activates Caspase-1 by cleaving its precursor, pro-Caspase-1. Activated Caspase-1 facilitates downstream inflammatory responses. 4. Cytokine Maturation: Caspase-1 in its active form cleaves the pro-inflammatory cytokine precursor Pro-IL-1β into its active form, IL-1β, which is then secreted excessively to amplify the inflammatory response. 5. Pyroptosis and Pore Formation: Caspase-1 also converts Gasdermin-D (GSDM-D) by cleaving into its N-terminal active fragment (N-GSDM-D), forming membrane pores. This results in pyroptosis, a form of programmed cell death, and the release of excessive inflammatory cytokines. 6. Ectopic Expression of miRNAs: MicroRNAs hsa-miR-141 and hsa-miR-211 are potential therapeutic agents. Their ectopic expressions suppress the inflammasome assembly and activation by targeting the key components NLRP3 and Caspase-1, respectively, thus mitigating inflammatory responses and viral replication. 7. By restricting inflammasome activation , these miRNAs limit the severity of HSV-2 infection, demonstrating their potential as therapeutic agents to inhibit inflammation and control viral pathogenesis.
Article Snippet: The miRNAs hsa-miR-141-3p and hsa-miR-211-5p were selected for this study based on preliminary screening using the Human Inflammatory and Immune Response miRNA PCR Array (Qiagen, Cat. No. MIHS-105ZA), which revealed their downregulation in HSV-2-infected THP-1 cells ( ).
Techniques: Protein-Protein interactions, Virus, Infection, Activation Assay, Membrane, Expressing, Control