Recombinant Human IL-6 Protein [His]

Aim:Given the immunosuppressive nature of pancreatic cancer, we investigated the relationship between epigenetic modification of immune-regulatory cytokine genes and pancreatic cancer outcomes.Materials & methods:We evaluated DNA methylation of 184 pancreatic tumor samples from The Cancer Genome Atlas for 111 CpG loci in seven cytokine genes:IL10,IL6,IL8,TGF beta 1,TGF beta 2,TGF beta 3andTNF. We used Cox regression to evaluate the associations between methylation and overall survival, disease-specific survival and disease progression (alpha = 0.05).Results:Poorer survival was associated with increased methylation in fifteen CpG probes inTGF beta 1,TGF beta 2,TGF beta 3andTNF. We also detected improved outcomes for three loci inIL10,IL8andIL6.Conclusion:Epigenetic regulation of cytokine-related gene expression may be associated with pancreatic cancer outcomes.

A stressor can induce resilience in another, different stressor, a phenomenon known as cross-tolerance. To learn if cross-tolerance is governed by epigenetic regulation, we used embryonic heat conditioning (EHC) in chicks, during the development of the hypothalamus, to increase the immunization response. Indeed, EHC induced a lifelong systemic antibody response to immunization, in addition to reduced hypothalamicIL6inflammatory expression following LPS challenge. Since the outcome of EHC was long-term cross-tolerance with the immune system, we studied possible epigenetic mechanisms. We first analysed the methylation and hydroxymethylation patterns ofIL6. We found reduced hydroxymethylation onIL6intron 1 in the EHC group, a segment enriched with CpGs and NFkB-binding sites. Luciferase assay in cell lines expressing NFkB showed thatIL6intron 1 is indeed an enhancer. ChiP in the same segment against NFkB in the hypothalamus presented reduced binding toIL6intron 1 in the EHC group, before and during LPS challenge. In parallel, EHC chicks'IL6intron 1 presented increased H3K27me3, a repressive translational modification mediated by EZH2. This histone modification occurred during embryonic conditioning and persisted later in life. Moreover, we showed reduced expression of miR-26a, which inhibitsEZH2transcription, during conditioning along with increasedEZH2expression. We demonstrate that stress cross-tolerance, which was indicated by EHC-induced inflammatory resilience and displayed by attenuated inflammatory expression ofIL6, is regulated by different epigenetic layers.