Fei-Lan Liu

Taipei Veterans General Hospital, T’ai-pei, Taipei, Taiwan

Are you Fei-Lan Liu?

Claim your profile

Publications (7)28.83 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: Inhibition of osteoclast formation is a potential strategy to prevent inflammatory bone resorption and to treat bone diseases. Herein, the purpose was to discover of modified salicylanilides and 3-phenyl-2H-benzo[e][1,3]oxazine-2,4(3H)-dione derivatives as potential antiosteoclastogenic agents. Their inhibitory effects of RANKL-induced osteoclastogenesis from RAW264.7 cells were evaluated by TRAP stain assay. The most potent compounds, 1d and 5d, suppressed RANKL-induced osteoclast formation and TRAP activity dose-dependently. The cytotoxicity assay on RAW264.7 suggested that the inhibition of these compounds on osteoclastic bone resorption did not result from their cytotoxicity. Moreover, both compounds down-regulated RANKL-induced NF-κB and NFATc1 in nucleus, suppressed the expression of osteoclastogenesis-related marker genes during osteoclastogenesis and prevented osteoclastic bone resorption, but did not impair osteoblast differentiation in MC3T3-E1. Therefore, these modified salicylanilides and 3-phenyl-2H-benzo[e][1,3]oxazine-2,4(3H)-diones could be the potential lead compounds for the development of a new type of antiresorptive agents.
    Journal of medicinal chemistry. 09/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: The efficient synthesis of mono-substituted anthraquinones and ring fusion into anthra[2,3-d]oxazole-2-thione-5,10-dione derivatives were developed, and all the compounds were tested for their cytotoxicity against PC-3 cancer cell lines. Compounds 8, 14, 17 and 23 were selected by the NCI and 12, 17 and 19 were evaluated for topoisomerase I-mediated DNA relaxation. Among them, 17 appeared to be the most active compound of this series and not only showed higher inhibition when indicated from the low IC50 values against PC-3 cancer cell line but also attenuated the in vitro topoisomerase I-mediated DNA relaxation at low micromolar concentrations. All test compounds exhibited different cytostatic and cytotoxic activities for further developing potential anticancer drugs.
    European Journal of Medicinal Chemistry 09/2014; 87C:30-38. · 3.43 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Objectives. The aims of this study were to investigate the expression of amphiregulin (AREG) and TNF-α-converting enzyme (TACE) in fibroblast-like synoviocytes from humans with RA (FLS-RA) when stimulated with proinflammatory cytokines and to explore whether AREG plays a role in RA.Methods. The effects of cytokines on the expression of AREG and TACE in FLS-RA were measured by quantitative RT-PCR and western blotting. Blockade of IL-1β-mediated pathways was used to verify the involvement of intracellular signal pathways in the induction of AREG and TACE. TAPI-1 and TACE short hairpin RNA (shRNA) infection were used to identify the role of TACE in IL-1β-induced AREG secretion and shedding. AREG-induced production of MMP-1 and cadherin-11 in FLS-RA were measured by ELISA or western blotting. The effect of AREG on FLS-RA invasion was examined using a Transwell invasion assay.Results. IL-1β, but not other tested cytokines, increased the expressions of AREG mRNA and protein in a dose-responsive and time-dependent manner in FLS-RA. IL-1β induced AREG expression via p38 MAPK, NF-κB, JNK and ERK1/2 signalling pathways and induced TACE expression via PI3K, p38MAPK and NF-κB signalling pathways in FLS-RA. TACE mediated AREG secretion and shedding. EGFR (ErbB1) and Her-2 (ErbB2) were expressed in FLS-RA, and AREG increased MMP-1 and cadherin-11 expression in FLS-RA. AREG promoted the FLS-RA invasion ability.Conclusion. AREG and TACE expression were up-regulated by IL-1β and their activations on FLS-RA lead to the matrix degradation by inducing MMP-1 and cadherin-11 production. TACE activity is necessary for IL-1β-induced AREG release. Our results demonstrate that IL-1β-induced AREG release may be involved in the pathogenesis of RA.
    Rheumatology (Oxford, England) 11/2013; · 4.24 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: OBJECTIVE: The increased risk of thrombosis in systemic lupus erythematosus (SLE) may be partially explained by interrelated genetic pathways for thrombosis and SLE. We investigated whether 33 established and novel single nucleotide polymorphisms (SNP) in 20 genes involved in hemostasis pathways that have been associated with deep venous thrombosis (DVT) in the general population were risk factors for SLE among Asians. METHODS: Patients in the discovery cohort were enrolled in one of two North American SLE cohorts. Patients in the replication cohort were enrolled in one of four Asian or two North American cohorts. We first genotyped 263 Asian SLE and 357 healthy Asian control individuals for 33 SNPs in the discovery phase, and then genotyped 5 SNPs in up to an additional 1496 cases and 993 controls in the replication phase. Patients were compared to controls for bivariate association with minor alleles. Principal components analysis was used to control for intra-Asian ancestry in the replication cohort. RESULTS: Two genetic variants in the gene VKORC1 were highly significant in both the discovery and replication cohorts: rs9934438 OR((disc)) 2.45 (p=2x10(-9) ), OR((rep)) 1.54 (p=4x10(-6) ) and rs9923231 OR((disc)) 2.40 (p=6x10(-9) ), OR((rep)) 1.53, (p=5x10(-6) ). These associations were significant in the replication cohort after adjustment for intra-Asian ancestry: rs9934438 OR((adj)) 1.34 (p=0.0029) and rs9923231 OR((adj)) 1.34 (p=0.0032). CONCLUSION: Genetic variants in VKORC1, involved in vitamin K reduction and associated with DVT, are associated with SLE development in Asians. These results suggest intersecting genetic pathways for the development of SLE and thrombosis. © 2012 American College of Rheumatology.
    Arthritis & Rheumatology 11/2012; · 7.48 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: To demonstrate the therapeutic potential for cartilage repair of mesenchymal stem cells derived from human umbilical cord (HUCSC), we studied the clinical and histopathological effects of intra-articular injection of HUCSCs in a collagen-induced arthritis (CIA) model. In our study, intra-articular injection of HUCSCs had no benefit in CIA mice; and accelerated the progression of arthritis in the presence of TNF-α. To determine the role of TNF-α, we injected the combination with HUCSCs and TNF inhibitor, showed reduced the disease signs in CIA mice. On exposure of TNF-α, stem cells significantly decreased the expression of CD90, HLA-G, and the levels of IL-10 in vitro and in vivo. Our data showed that TNF-α blocks the immunosuppressive effects of HUCSCs and that inhibition of TNF-α decreases cartilage destruction by suppressing the immunogenicity of HUCSCs. Injecting both a TNF inhibitor and HUCSCs may be a potential effective therapy for ameliorating the disease.
    Cellular Immunology 12/2011; 273(1):30-40. · 1.74 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: Systemic lupus erythematosus (SLE) is a multisystem, autoimmune disease that predominantly affects women. Previous findings that duplicated Toll-like receptor 7 (Tlr7) promotes lupus-like disease in male BXSB mice prompted us to evaluate TLR7 in human SLE. By using a candidate gene approach, we identified and replicated association of a TLR7 3'UTR SNP, rs3853839 (G/C), with SLE in 9,274 Eastern Asians (P(combined) = 6.5 x 10(-10)), with a stronger effect in male than female subjects [odds ratio, male vs. female = 2.33 (95% CI = 1.64-3.30) vs. 1.24 (95% CI = 1.14-1.34); P = 4.1 x 10(-4)]. G-allele carriers had increased TLR7 transcripts and more pronounced IFN signature than C-allele carriers; heterozygotes had 2.7-fold higher transcripts of G-allele than C-allele. These data established a functional polymorphism in type I IFN pathway gene TLR7 predisposing to SLE, especially in Chinese and Japanese male subjects.
    Proceedings of the National Academy of Sciences 09/2010; 107(36):15838-43. · 9.81 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: To investigate the expression of growth differentiation factor-5 (GDF-5) in chondrocytes (HC) and fibroblast-like synoviocytes (FLS) from humans with rheumatoid arthritis (RA) when stimulated with proinflammatory cytokines and to explore whether GDF-5 plays a role in regulating the differentiation of FLS-RA into chondrocytes. Expression of GDF-5 in synovium and cartilage in RA and osteoarthritis (OA) was assessed by immunohistochemistry. GDF-5 production in FLS-RA and HC-RA was examined through real-time quantitative RT-PCR (Q-PCR) and western blotting. Expressions of GDF-associated receptors on FLS-RA were determined by semiquantitative-PCR, and MTT assay was used to study the effects on FLS-RA proliferation. Effect of GDF-5 and TGF-beta3 on in vitro chondrogenic ability of FLS-RA was investigated using pellet-culture system, Q-PCR and histological analysis. Immunohistochemical analysis demonstrated that GDF-5 expression in the synovium and cartilage from joints of RA patients was much lower than that of OA patients. Addition of IL-1beta or TNF-alpha appeared to downregulate the expression of GDF-5 in HC-RA and FLS-RA. Inhibition of GDF-5 expression by IL-1beta in RA-FLS was attenuated by pretreatment with MEK1/2 inhibitor. GDF-5-associated receptors were expressed in FLS-RA, but GDF-5 had no effect on FLS-RA proliferation. GDF-5 had a strong chondrogenic-promoting effect on TGF-beta3-induced chondrocyte differentiation in FLS-RA. GDF-5 is expressed in FLS-RA and HC-RA, and its expression is strongly downregulated by proinflammatory cytokines. MEK-ERK pathway is a negative regulator of GDF-5 expression in FLS-RA. In FLS-RA, synergy between GDF-5 and TGF-beta3 enhances chondrogenesis. Anti-inflammatory drugs combined with GDF-5 might be a new therapeutic treatment for RA.
    Experimental and Molecular Pathology 10/2009; 88(1):163-70. · 2.13 Impact Factor