Effect of zinc on apoptosis and P53 et al gene expression in HL-60 cells

  Objective   To study the effect of tr ace element zinc on apoptosis in HL-60 cells and its mechanism.

  Methods   The HL-60 cells were cultured by usual rules for 24 h and then divided into group of control, N, N, N., N.-tetrakis(2-pyridylmethyl)ethylenediamine(TPEN).TPEN+ZnSO ₄.The apoptosis of cells w as observed by means of morphological changes, flow cytometry analysis and agarose gel electrophoresis of DNA.The genes expression asso ciated with apoptosis were detected in both mRNA and protein levels by mRNA slo-tblot and western-blot.

  Results   Intacellular Zn ²⁺ decrease could induce apoptosis in HL-60 cells and dow n-regulate expression of genes bc-l 2, c-myc in both mRNA and protein levels, but additiion of ZnSO ₄(final concentration of 20 Lmol/L)improved the conditions.

  Conclusion   Down-regulated expression of genes bc-l 2, -cmyc are associated with the process of apoptosis induced by intracellular Zn ²⁺ decrease.