Abstract
Short-term cultures of phytohaentagglutinin (PHA)-stimulated human lymphocytes are widely used to detect chromosome-damaging agents1,2, possible human exposure to mutagenic carcinogens1,2 and the immune response of blood3. Because the results are affected by the number of cell divisions before sampling1,2,4,5, an accurate knowledge of lymphocyte proliferation in culture is essential for these studies. Unfortunately, the information available on the lymphocyte proliferative characteristics is quite conflicting. For instance, although after stimulation of blood lymphocytes with PHA the cultures soon contain cells that have divided different numbers of times6,7: this heterogeneity has been explained variously as a difference in cell-cycle times8,9 or in the times when the cells start blasto-genesis by responding to PHA10–12. Prolonged treatment with high concentrations of 3H-thymidine (TdR) have often been used to investigate lymphocyte proliferation8,10,13,14. Incorporated 3H-TdR can, however, affect cell kinetics15–19. The differential staining of sister chromatids20 in cells dividing for different numbers of times in the presence of bromodeoxy-uridine (BUdR) can be used to study cell kinetics7,8,12. In experiments combining sister chromatid differential staining and autoradiography, we show here that 3H-TdR labelling at more than 0.1 µCi ml−1 slows lymphocyte cycling, and that the heterogeneity of different generations of cells is caused by a difference in the times when they start their first DNA synthesis in response to PHA.
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Morimoto, K., Wolff, S. Cell cycle kinetics in human lymphocyte cultures. Nature 288, 604–606 (1980). https://doi.org/10.1038/288604a0
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DOI: https://doi.org/10.1038/288604a0
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