Hongji Yan

Harbin Institute of Technology, Harbin, Heilongjiang Sheng, China

Are you Hongji Yan?

Claim your profile

Publications (3)5.31 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: The interactions between cancer cells and the extracellular matrix (ECM) are important with respect to a number of cell behavoirs, yet remain unclear. In this study, self-assembled monolayers with different terminal chemical groups (hydroxyl (-OH), carboxyl (-COOH), animo (-NH2), mercapto (-SH), and methyl (-CH3)) were employed as substrates for the culture of MCF-7 cells to examine effects on cell behavior. Cell spreading was investigated by scanning electron microscopy, tallin expression by immunofluorescence, proliferation rate by counting cell numbers, cell cycle by flow cytometry, metabolism by high-performance liquid chromatography and cell migration by live cell imaging. Annexin V-FITC (fluorescein isothiocyanate) and JC-1 assays were performed to determine cell apoptosis and mitochondrial membrane potential, respectively. Our results demonstrate the varied behaviors of MCF-7 cells in response to different chemical groups. Specifically, NH2 and COOH terminal functional groups promote proliferation, the production of lactic acid and mobility of MCF-7 cells; SH and OH terminal groups enhance the expression and distribution of tallin but result in weak cell proliferation, metabolism, spreading and mobility. These results are meaningful for uncovering the interactions between the ECM and cancer cells; they are potentially useful for designing novel cancer treatment strategies.
    Biomedical Materials 04/2013; 8(3):035008. · 2.17 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: The aim of this study was to demonstrate the effects of the AMP-activated protein kinase (AMPK) activator 5-amino-4-imidazolecarboxamide riboside (AICAR) in combination with arsenic trioxide (ATO) in acute myeloid leukemia cells and determine its mechanism of action. Cell lines were either exposed to each drug alone or both the drugs simultaneously. Cell proliferation, cell cycle and apoptosis were assessed. Combination index (CI) method was used to calculate the synergistic, additive, or antagonistic effects of these drugs. Western blot technique was used to study the signaling molecules in the AMPK/TSC2/mTOR pathway. Simultaneous exposure of HL-60 cells to AICAR and ATO indicated a synergism (CI < 1), whereas CI on NB4 cells was greater than 1. In HL-60, the change in expression level of each protein was quite significant in the presence of the combination as compared to that induced through any single agent. On the contrary, ATO weakened the effect of AICAR-mediated AMPK activation in NB4 cells. ATO caused a profound decrease in the protein level of PML/RARalpha in NB4 cells after 48 h, but there was no change with AICAR and the combination. The combination of AICAR and ATO produced a synergistic effect in the treatment of HL-60 cells involving AMPK/TSC2/mTOR pathway, and AICAR reduced ATO-mediated apoptotic death on acute promyelocytic leukemia NB4 cells.
    Pharmazie 02/2013; 68(2):117-23. · 0.96 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Rotary cell culture systems (RCCS) have been shown to be promising for promoting three-dimensional (3D) cell growth and assembly of cells into functional tissues. In this study, 3D tissue-like spheroids of MCF-7 cells were constructed by encapsulating the cells in the collagen-alginate hydrogel, and then cultured in a RCCS to investigate the proliferation of MCF-7 cells. The results from the MTT assay showed that the proliferation rate of MCF-7 cells cultured in the RCCS was higher than that of the static culture control group, and the results from the flow cytometry revealed that the cells in S and G2/M phase were significantly increased compared to the control group. The expression of cell proliferation antigen PCNA and cyclin D1 was also examined with the results further supporting the enhanced proliferation of MCF-7 cells by the RCCS. The results from indirect immunofluorescence revealed that the rotary culture altered neither the cytoskeleton distribution nor the assembly of mitotic spindle. By examination, it was also shown that the rotary culture induced the ERK1/2-MAPK pathway. Taken together, this study demonstrated that the rotary culture could promote the proliferation of MCF-7 cells by inducing the ERK1/2 pathway.
    Biomedical Materials 02/2012; 7(1):015003. · 2.17 Impact Factor

Publication Stats

3 Citations
5.31 Total Impact Points

Top Journals

Institutions

  • 2013
    • Harbin Institute of Technology
      • School of Life Science and Technollogy
      Harbin, Heilongjiang Sheng, China