[Differences between spleen and thymus cells of rats with respect to the effects of ethidium bromide on unscheduled DNA synthesis (DNA repair synthesis) and nucleoid sedimentation].

K Tempel, A Goette, I Schmerold
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Abstract

To get further insight into the causes of differences between rat splenic and thymic cells with regard to DNA repair synthesis, scheduled (SDS) and unscheduled (UDS) DNA synthesis as well as nucleoid sedimentation of the cells were investigated under the influence of ethidium bromide (EB, 1-1000 micrograms/ml). - At concentrations of greater than or equal to 25 micrograms/ml, EB inhibited SDS of both cell species and UDS of thymic cells; much higher additions of the drug (greater than 200 micrograms/ml) were needed to diminish UDS of splenic cells, lower EB-concentrations (25-175 micrograms/ml) stimulating the UDS of the splenic cell preparation. - The sedimentation rate of splenic and thymic cell nucleoids within neutral sucrose gradients had a biphasic dependence on the EB-concentrations. As compared to thymic cells however, preincubation of splenic cells with 50-250 micrograms EB/ml resulted in a significant greater (15-30 percent) sedimentation distance. - The results suggest that a relationship exists between the stimulation of UDS and the ability of cells to establish a greater DNA compactness in the presence of EB.

[大鼠脾脏和胸腺细胞在溴化乙啶对非计划性DNA合成(DNA修复合成)和类核沉积影响方面的差异]。
为了进一步了解大鼠脾脏和胸腺细胞DNA修复合成差异的原因,在溴化乙啶(EB, 1-1000微克/毫升)的影响下,研究了细胞的预定(SDS)和非预定(UDS) DNA合成和类核沉积。-当EB浓度大于或等于25微克/毫升时,EB抑制两种细胞的SDS和胸腺细胞的UDS;需要更高的药物添加量(大于200微克/毫升)来减少脾细胞的UDS,较低的eb浓度(25-175微克/毫升)刺激脾细胞制剂的UDS。-中性蔗糖梯度下脾脏和胸腺细胞类核的沉降速率与eb浓度呈双相依赖性。然而,与胸腺细胞相比,脾细胞用50-250微克EB/ml预孵育可显著增加沉降距离(15- 30%)。-结果表明,在EB存在下,UDS的刺激与细胞建立更大DNA紧密度的能力之间存在关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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