Are you Dan-Dan Liu?

Claim your profile

Publications (2)5.33 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Paeoniflorin (Pae) is extracted from the root of paeonia lactiflora which have attracted attention for anti-rheumatic and immune modulating properties. To investigate the role of PI3K/Akt/mTOR signaling mediated by BAFF/BAFF-R in antibodies production and the regulation of Pae on the signaling pathway in rats with collagen-induced arthritis (CIA). CIA rats were randomly separated into different groups and treated with Pae (25, 100mg/kg) from day 18 to day 38 after immunization. The effects of Pae on B lymphocytes of CIA rats were evaluated by the levels of BAFF, anti-CII antibody, IgA, IgG and IgM, and the expressions of BAFF-R, PI3K, p-Akt and mTOR. In CIA rats, the levels of anti-CII antibody, IgA, IgG and IgM in serum enhanced, BAFF, BAFF-R, PI3K, p-Akt and mTOR were highly expressed. Pae (100mg/kg) obviously decreased arthritis score, relieved ankle and paw swelling, improved spleen histopathology in CIA rats, decreased the levels of IgA, IgM, IgG and anti-CII antibody, and significantly decreased the expressions of BAFF, BAFF-R, PI3K, p-Akt and mTOR. PI3K/Akt/mTOR signaling mediated by BAFF/BAFF-R participates in antibodies production by B lymphocytes of CIA rats. Pae had therapeutic effects on rats with CIA. These effects might be relative to regulating PI3K/Akt/mTOR signal mediated by BAFF/BAFF-R, and down regulate the antibodies production further.
    Journal of ethnopharmacology 02/2012; 141(1):290-300. · 2.32 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: In addition to modulate B cells function, B cell activating factor belonged to TNF family (BAFF) also regulates T cells response via BAFFR and transmembrane activator and calcium modulator and cyclophilin-ligand interactor (TACI) expressing on activated T cells. This study explored the effect of a recombinant fusion protein containing the extracellular ligand-binding portion of TACI and the Fc portion of human immunoglobulin G (TACI-Ig) on activated T cells that were obtained from antigen-specific T-cell responses mice model induced by keyhole limpet haemocyanin (KLH), the characteristics of KLH-challenged mice were observed simultaneously. KLH immunization leaded to a significant positive relationship between BAFF level in serum and the extent of spleen histopathology. Serum concentration of BAFF, APRIL, IgM and IgG antibodies to KLH, and IL-4 were increased under KLH immunization, but IL-2 synthesis was decreased, resulting in a downregulation of IL-2/IL-4 ratio. Antigen-specific T cells proliferation, IL-5 production, the percentage of Th and activation T cells were significantly upregulated, however, IL-2 secretion and the percentage of naïve T cells were downregulated in vitro. RhBAFF co-stimulation further evoked T cells hyperplasy, IL-4 and IFN-γ expression, the subgroups of Th, early antigen activation and activation T cells were also further increased. On the contrary, naïve T cells were further reduced under rhBAFF stimuli. Administration of rhTACI-Ig significantly inhibited T cells proliferation, cytokines production and T cells differentiation, and the inhibitory effects might be associated with its ability to neutralize both the exogenous and endogenetic BAFF and APRIL.
    Molecular Immunology 10/2011; 49(1-2):380-6. · 3.00 Impact Factor