The human long noncoding RNA lnc-IL7R regulates the inflammatory response

Area of Science:

• Molecular Biology
• Immunology
• Genetics

Background:

• Long noncoding RNAs (lncRNAs) are increasingly recognized for their regulatory roles in biological processes.
• The specific functions of lncRNAs in the inflammatory response remain largely unexplored.
• Interleukin-7 receptor alpha-subunit gene (IL7R) is involved in immune cell development and function.

Purpose of the Study:

• To identify novel lncRNAs involved in the inflammatory response.
• To investigate the role of lnc-IL7R in regulating lipopolysaccharide (LPS)-induced inflammation.
• To elucidate the molecular mechanism by which lnc-IL7R modulates inflammatory gene expression.

Main Methods:

• Human lncRNA microarray assays were performed to identify differentially expressed lncRNAs.
• Lnc-IL7R expression was analyzed in response to LPS stimulation.
• Functional studies involved lnc-IL7R knockdown to assess its impact on inflammatory markers.
• Chromatin immunoprecipitation (ChIP) assays were used to examine histone modifications at target gene promoters.

Main Results:

• A set of lncRNAs showed altered expression upon LPS treatment.
• Lnc-IL7R, overlapping the IL7R gene, was significantly upregulated in LPS-treated cells.
• Knockdown of lnc-IL7R exacerbated the LPS-induced inflammatory response, increasing expression of E-selectin, VCAM-1, IL-6, and IL-8.
• Lnc-IL7R knockdown led to decreased trimethylation of histone H3 at lysine 27 (H3K27me3) at the promoters of inflammatory mediators.

Conclusions:

• Lnc-IL7R plays a significant role in modulating the inflammatory response.
• Lnc-IL7R functions, in part, by influencing epigenetic modifications at inflammatory gene loci.
• These findings reveal a novel regulatory mechanism for inflammation involving lncRNAs.