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Published on: January 7, 2019
MiR-150 impairs inflammatory cytokine production by targeting ARRB-2 after blocking CD28/B7 costimulatory pathway
Wei Sang1, Ying Wang1, Cong Zhang2
1The Key Laboratory of Transplantation Immunity, Affiliated Hospital of Xuzhou Medical College, Jiangsu Province, China.
Abstract:
MiR-150, a major modulator negatively regulating the development and differentiation of various immune cells, is widely involved in orchestrating inflammation. In transplantation immunity, miR-150 can effectively induce immune tolerance, although the underlying mechanisms have not been fully elucidated. In the current study, we found that miR-150 is elevated after blocking CD28/B7 co-stimulatory signaling pathway and impaired IL-2 production by targeting ARRB2. Further investigation suggested that miR-150 not only repressed the level of ARRB2/PDE4 directly but also prevented AKT/ARRB2/PDE4 trimer recruitment into the lipid raft by inhibiting the activities of PI3K and AKT through the cAMP-PKA-Csk signaling pathway. This leads to the interruption of cAMP degradation and subsequently results in inhibition of the NF-kB pathway and reduced production of both IL-2 and TNF. In conclusion, our study demonstrated that miR-150 can effectively prevent CD28/B7 co-stimulatory signaling transduction, decrease production of inflammatory cytokines, such as IL-2 and TNF, and elicit the induction of immune tolerance. Therefore, miR-150 could become a novel potential therapeutic target in transplantation immunology.
Insights
MicroRNA-150 (miR-150) induces immune tolerance by inhibiting inflammatory cytokine production after blocking CD28/B7 signaling. This study reveals miR-150
Area of Science:
- Immunology
- Molecular Biology
- Transplantation Science
Background:
- MicroRNA-150 (miR-150) plays a key role in immune cell regulation and inflammation.
- Its precise mechanisms in inducing immune tolerance during transplantation are not fully understood.
Purpose of the Study:
- To elucidate the molecular mechanisms by which miR-150 induces immune tolerance.
- To investigate miR-150's role in regulating CD28/B7 co-stimulatory signaling and cytokine production.
Main Methods:
- Investigated miR-150 expression following CD28/B7 pathway blockade.
- Utilized molecular biology techniques to identify targets and signaling pathways involved (ARRB2, PI3K, AKT, cAMP-PKA-Csk, NF-kB).
- Measured levels of IL-2 and TNF cytokines.
Main Results:
- miR-150 levels increased upon CD28/B7 pathway blockade, impairing IL-2 production by targeting ARRB2.
- miR-150 inhibited PI3K/AKT activity, preventing ARRB2/PDE4 trimer recruitment and interrupting cAMP degradation.
- This led to NF-kB pathway inhibition and reduced IL-2 and TNF production.
Conclusions:
- miR-150 effectively inhibits CD28/B7 signaling, reduces inflammatory cytokine production (IL-2, TNF), and promotes immune tolerance.
- miR-150 presents a potential therapeutic target for transplantation immunology.
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