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- W2015558270 abstract "In the presence of 1–5 mM n-butyrate, murine leukemic L1210 cells cease proliferation and become arrested in the G1A compartment of the G1 phase. Cells in this compartment, in comparison with the remaining cells of the G1 phase (G1B), are characterized by low RNA content and more condensed chromatin. During unperturbed growth the cell residence times in G1A are of indeterminate duration (exponentially distributed); the half-time of L1210 cell residence in G1A is about 1.4 h. The effect of n-butyrate in arresting cells in G1A was concentration-dependent. However, the sensitivity of L1210 cells to this drug was markedly enhanced when cells were treated for longer than one generation (12 h). Cells arrested in G1A remained viable and when n-butyrate was removed, after a lag period, they resumed progression through the cycle. The effect of n-butyrate on cell progression through various parts of the cycle was studied in a stathmokinetic experiment. The rate of cell entrance into mitosis was decreased by 30, 60 and 110%, in the presence of 1, 2.5 and 5 mM n-butyrate respectively, thus indicating a slowdown in cell progression through G2 and S. The duration of G2 was prolonged by 20, 70 and 140% at 1, 2.5 and 5 mM n-butyrate respectively. The half-time of cell residence in G1A was increased by as much as 1.5-, 6.3- and 15.6-fold by 1, 2.5 and 5 mM n-butyrate. Progression through late G1 (G1B) was not affected at 1 mM, and could not be estimated at higher drug concentrations. The effects on cell cycle progression were evident 1 h after addition of n-butyrate. DNA in situ in nuclei of n-butyrate-treated cells had lowered (by 2–8 °C) stability to thermal denaturation and increased (by 15%) accessibility to DNase I. The decrease in DNA stability to heat was more pronounced when permealized cells were heated in the presence of 1 mM MgCl2 rather than EDTA. DNA in situ in the nuclei of n-butyrate-treated cells also showed decreased sensitivity to acid-induced denaturation. Changes in chromatin were seen in all cells, regardless of cell cycle phase, within the first hours after addition of n-butyrate. Mitotic cells, however, reacted to n-butyrate more rapidly than interphase cells. The observed changes in L1210 cells are most likely a consequence of histone modifications (acetylation of inner histones, dephosphorylation of histone H1) induced by n-butyrate." @default.
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- W2015558270 title "Effect of n-butyrate on cell cycle progression and in situ chromatin structure of L1210 cells" @default.
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- W2015558270 doi "https://doi.org/10.1016/0014-4827(81)90006-9" @default.
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