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Exponentially growing CHO cells exposed to millimolar concentrations of sodium butyrate (SB) for 24 h were treated with AluI using two methods of cell poration, i.e., electroporation and streptolysin O (SLO). Under both conditions, SB was found to induce a 2-4-fold increase in AluI-induced chromosomal aberrations. When cells in monolayer were treated with AluI/SLO, lower concentrations of SB (2.5 mM) and AluI (1-4 U/ml) were required to produce a similar effect as that observed for electroporated cells, demonstrating the differential sensitivity of the two methods. Furthermore, in AluI/SLO-treated cells, a higher percentage of cells was found to show increased frequencies of aberrations per cell, compared to AluI/electroporated cells. The mechanism by which SB modulates the cell response to AluI treatment might involve changes in chromatin configuration thereby increasing the accessibility of AluI to different parts of chromatin.
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