Journal
IMMUNOLOGY
Volume 149, Issue 1, Pages 74-86Publisher
WILEY
DOI: 10.1111/imm.12631
Keywords
hypoxia-inducible factors; interleukin-9; microRNAs; Thelpercells
Categories
Funding
- Biotechnology and Biological Sciences Research Council (BBSRC) [BB/H018573/1]
- BD Biosciences grant
- Biotechnology and Biological Sciences Research Council [BB/H018573/1, BB/F011180/1] Funding Source: researchfish
- BBSRC [BB/F011180/1, BB/H018573/1] Funding Source: UKRI
Ask authors/readers for more resources
MicroRNAs (miRNAs) regulate many aspects of helper T cell (Th) development and function. Here we found that they are required for the suppression of interleukin-9 (IL-9) expression in Th9 cells and other Th subsets. Two highly related miRNAs (miR-15b and miR-16) that we previously found to play an important role in regulatory T (Treg) cell differentiation were capable of suppressing IL-9 expression when they were over-expressed in Th9 cells. We used these miRNAs as tools to identify novel regulators of IL-9 expression and found that they could regulate the expression of Epas1, which encodes hypoxia-inducible factor (HIF)-2. HIF proteins regulate metabolic pathway usage that is important in determining appropriate Th differentiation. The related protein, HIF-1 enhances Th17 differentiation and inhibits Treg cell differentiation. Here we found that HIF-2 was required for IL-9 expression in Th9 cells, but its expression was not sufficient in other Th subsets. Furthermore, HIF-2 suppressed Treg cell differentiation like HIF-1, demonstrating both similar and distinct roles of the HIF proteins in Th differentiation and adding a further dimension to their function. Ironically, even though miR-15b and miR-16 suppressed HIF-2 expression in Treg cells, inhibiting their function in Treg cells did not lead to an increase in IL-9 expression. Therefore, the physiologically relevant miRNAs that regulate IL-9 expression in Treg cells and other subsets remain unknown. Nevertheless, the analysis of miR-15b and miR-16 function led to the discovery of the importance of HIF-2 so this work demonstrated the utility of studying miRNA function to identify novel regulatory pathways in helper T-cell development.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available