These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Paeoniflorin ameliorates murine lupus nephritis by increasing CD4+Foxp3+ Treg cells via enhancing mTNFα-TNFR2 pathway.
    Author: Liang CL, Lu W, Qiu F, Li D, Liu H, Zheng F, Zhang Q, Chen Y, Lu C, Li B, Dai Z.
    Journal: Biochem Pharmacol; 2021 Mar; 185():114434. PubMed ID: 33513343.
    Abstract:
    Treg cells are essential for re-establishing self-tolerance in lupus. However, given that direct Treg therapies may be inadequate to control autoimmunity and inflammation, a strategy of inducing or expanding endogenous Treg cells in vivo may be a good option. Macrophages are main tissue-infiltrating cells and play a role in promoting Treg differentiation while paeoniflorin (PF), a monoterpene glycoside, exhibits anti-inflammatory and immunoregulatory effects. Here, we studied the effects of PF on CD4+FoxP3+ Treg frequency and the potential mechanisms involving M2 macrophages. We demonstrated that PF ameliorated lupus nephritis in lupus-prone B6/gld mice by reducing urinary protein, serum creatinine and anti-dsDNA levels, diminishing renal cellular infiltration, improving renal immunopathology and downregulating renal gene and protein expressions of key cytokines, including IFN-γ, IL-6, IL-12 and IL-23. PF also lowered the percentage of CD44highCD62Llow effector T cells while augmenting CD4+FoxP3+ Treg frequency in B6/gld mice. Importantly, PF increased TNFR2 expression on CD4+FoxP3+ Tregs, but not CD4+FoxP3- T cells, in vivo and in vitro. Furthermore, we found that CD206+ subset of F4/80+CD11b+ macrophages expressed a higher level of mTNF-α than their CD206- counterparts while PF increased mTNF-α expression on CD206+ macrophages in vitro and in vivo. In vitro studies showed that mTNF-α+ M2 macrophages were more potent in inducing Treg differentiation and proliferation than their mTNF-α- counterparts, whereas the effects of mTNF-α+ M2 macrophages were largely reversed by separation of M2 macrophages using a transwell or TNFR2-blocking Ab in the culture. Finally, PF also promoted in vitro Treg generation induced by M2 macrophages. Thus, we demonstrated that mTNFα-TNFR2 interaction is a new mechanism responsible for Treg differentiation mediated by M2 macrophages. We provided the first evidence that PF may be used to treat lupus nephritis.
    [Abstract] [Full Text] [Related] [New Search]