Project description:LL-37, a 37-amino acid human-derived antimicrobial peptide, exhibits antiviral functions against multiple enveloped and non-enveloped viruses. We here report that the expression of the Stac is upregulated by LL-37 regardless of EV71 infection in Caco-2 colorectal adenocarcinoma cells. The treatment of LL-37 inhibits viral infection compared to the scramble(scr) control. In addition, LL-37 significantly upregulates the Stac expression in the presence or absence of EV71 infection, while the viral infection itself does not affect the expression of Stac. Take together, our data provide a novel mechanism of its antiviral activity for non-enveloped viruses, in which LL-37 modulates the host genes, interfering with the process of viral infection.
Project description:Gene expression in THP-1 cells treated for 6 hours with CNT and GNP conjugated with LL-37, LL-37 spiked as well as free LL-37: Reference (Total RNA Mixture of all samples) vs. treated cells
Project description:Rosacea is a chronic inflammatory disease of facial skin with unknown pathophysiology. Abnormal overexpression of human antimicrobial peptide LL-37 is a hallmark of rosacea. However, its significance in the rosacea pathogenesis is not fully understood. We sought to understand the molecular mechanisms of LL-37-mediated rosacea-like inflammation in an in-vitro model of normal human epidermal keratinocytes. Transcriptome profiling of LL-37-treated keratinocytes identified signatures of interferon (IFN)-stimulating genes (ISGs) such as CXCL10, IFIT2, RSAD2 and CXCL11 among the top upregulated differentially expressed genes. Gene ontogeny (GO) enrichment of biological processes revealed activation of cellular response to molecules of bacterial origin, response to chemokines, and cytokine mediated signaling pathways. While KEGG enrichment analysis revealed the activation of TNF signaling, IL-17 signaling, NF-kB signaling and chemokine signaling among the most significant pathways. Remarkably, T cell recruiting chemokine CXCL10 turns out to be the most abundant inflammatory mediator overexpressed upon LL-37 exposure. Mechanistically, LL-37 induced CXCL10 production relied on JAK-1/STAT-1 signaling pathway. In summary, our findings provide a crucial link to keratinocyte: T cell crosstalk and blockade of CXCL10:CXCR3 axis or JAK-1/STAT-1 pathways can be an effective anti-inflammatory strategy to reduce rosacea inflammation by restricting pathogenic T cells infiltration.
