Search NASA⌕ Search

SEARCH · Search NASA

Results for “position”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 397 records · Page 22
All sourcesNASA NTRSDOE OSTI
DOE OSTI2021

MicroRNA-7 overexpression positively regulates the CD8+ SP cell development via targeting PIK3R1

Highlights: • MicroRNA-7 overexpression promotes CD8{sup +} SP cell development. • We identified PIK3R1 as a target of miR-7. • The miR-7/PIK3R1 axis regulates CD8{sup +} SP cell development via modulating the balance of AKT/ERK pathways. microRNA-7 (miR-7), a distinct miRNA family member, has been reported to be involved in the biological functions of immune cells. However, the potential role of miR-7 in the CD8{sup +} T cell development remains to be elucidated. In this study, we estimated the potential effects of miR-7 overexpression in the thymic CD8{sup +} SP cell development using miR-7 overexpression mice. Our results showed that compared with those in control wild type (WT) mice, the volume, weight and total cell numbers of thymus in miR-7 overexpression (OE) mice increased significantly. The absolute cell number of CD8{sup +} SP cells in miR-7 OE mice increased and its ability of activation and proliferation enhanced. Futhermore, we clarified that miR-7 overexpression had an intrinsic promote role in CD8{sup +} SP cell development by adoptive cell transfer assay. Mechanistically, the expression level of PIK3R1, a target of miR-7, decreased significantly in CD8{sup +} SP cells of miR-7 OE mice. Moreover, the expression level of phosphorylated (p)-AKT and p-ERK changed inversely and indicating that miR-7 overexpression impaired the balance of AKE and ERK pathways. In summary, our work reveals an essential role of miR-7 in promoting CD8{sup +} SP cell development through the regulation of PIK3R1 and balance of AKT and ERK pathways.

60 APPLIED LIFE SCIENCES↗