Expression of B lymphocyte-induced maturation protein 1 (Blimp-1) in keratinocyte and cytokine signalling drives human Th17 response in psoriasis

Identification of a novel immunosenescence-related genes and integrative analyses in patients with psoriasis

BACKGROUND

Immunosenescence, characterized by age-related changes in the immune system, may contribute to the onset and progression of psoriasis, a condition whose incidence increases with age and often requires intensified medication in older patients.

METHODS

This study utilized bioinformatics analyses to identify differentially expressed immunosenescence-related genes in psoriasis patients from the GEO database. Enrichment, correlation, and interaction network analyses were conducted to explore their involvement in immune and inflammation pathways. Machine learning models were employed to predict psoriasis onset and validated using external datasets. Patient stratification based on gene expression patterns assessed differential responses to biologic inhibitors targeting specific genes.

RESULTS

Immunosenescence emerged as a significant factor in psoriasis pathogenesis, with genes such as BACH2 potentially influencing T cell activation and disease outcomes. Lower BACH2 expression levels were associated with poorer treatment responses in psoriasis patients.

CONCLUSIONS

This study sheds light on immunosenescence-related mechanisms in psoriasis, suggesting BACH2 as a potential disease diagnosis biomarker. Further research into BACH2's role in psoriasis pathophysiology is warranted to advance tailored treatment strategies.

Exploration of the biomarkers of comorbidity of psoriasis with inflammatory bowel disease and their association with immune infiltration

BACKGROUND

There was evidence that significant bidirectional associations between psoriasis and inflammatory bowel diseases (IBDs), which influences management strategy of the patients, so the investigation on the mechanisms by which these two diseases co-occur is important.

METHODS

The Gene Expression Omnibus (GEO) database was used to download gene expression profiles of psoriasis and IBD. The differentially expressed genes (DEGs) between disease and health control groups for each data set were calculated, and Venn diagram was used to obtain for intersection. We performed Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis on the intersection, followed by developing a protein-protein interaction network and module construction, and identified hub genes by cytoHubba. Thereafter, least absolute shrinkage and selection operator algorithms was used to identify the co-biomarkers of psoriasis and IBD from the top 50 hub genes. The biomarkers were used to construct a screening model, the discriminatory capacity of which was verified by receiver operating characteristic (ROC) curves. CIBERSORT algorithm was utilized to estimate the compositional patterns of immune cell infiltration in biomarkers of psoriasis and IBD. Spearman rank correlation analysis was used to further evaluate the correlation between the identified biomarkers and immune cells.

RESULTS

A total of 271 shared DEGs were screened. The GO and KEGG enrichment analysis indicated that the shared DEGs were mainly enriched in response to lipopolysaccharide, secretory granule lumen, cytokine activity, and interleukin (IL)-17 signaling pathway. Fifty genes such as IL1B, IL6, were identified as hub genes, based on which, FOS, IFI44, MMP9, MNDA, PTGS2, S100A9, and STAT1 were identified as biomarkers of psoriasis. CCL20, CD274, CTGF, CXCL1, CXCL10, CXCL2, CXCL9, FCGR3B, FOS, GBP1, GZMB, IFI27, IFI6, IL1RN, ISG15, ISG20, LCN2, LILRB2, MMP12, MMP7, S100A8, TLR8, and TNFSF13B were identified as biomarkers of IBD. FOS was the common biomarker of psoriasis and IBD. Screening models were validated in the validation data set (Psoriasis: area under the curve (AUC) = 1.000, IBD: AUC = 0.870). Immunocyte infiltration analysis showed the macrophages cells, mast cells resting, and T cells CD4 memory activated have the common characteristics in psoriasis and IBD.

CONCLUSIONS

FOS may play a key role in the occurrence and development of psoriasis complicated with IBD and macrophages cells may be an entrance for treating this comorbidity.