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Full-Text Articles in Medicine and Health Sciences
Dna Synthesis From Unbalanced Nucleotide Pools Causes Limited Dna Damage That Triggers Atr-Chk1-Dependent P53 Activation, Kedar Hastak, Rajib K. Paul, Mukesh K. Agarwal, Vijay S. Thakur, Arm R. Amin, Sudesh Agrawal, R. Michael Sramkoski, James W. Jacobberger, Mark W. Jackson, George R. Stark, Munna L. Agarwal
Dna Synthesis From Unbalanced Nucleotide Pools Causes Limited Dna Damage That Triggers Atr-Chk1-Dependent P53 Activation, Kedar Hastak, Rajib K. Paul, Mukesh K. Agarwal, Vijay S. Thakur, Arm R. Amin, Sudesh Agrawal, R. Michael Sramkoski, James W. Jacobberger, Mark W. Jackson, George R. Stark, Munna L. Agarwal
Pharmaceutical Science and Research
p53-dependent G1 and G2 cell cycle checkpoints are activated in response DNA damage that help to maintain genomic stability. p53 also helps to protect cells from damage that occurs during S phase, for example, when the cells are starved for DNA precursors or irradiated with a low dose of UV. p53 is activated in normal cells starved for pyrimidine nucleotides by treatment with N-(phosphonacetyl)-L-aspartate (PALA). The treated cells progress through a first S phase with kinetics similar to those of untreated cells. However, the DNA of the treated cells begins to become damaged rapidly, within 12 h, …
Regulation Of Apical Nhe3 Trafficking By Ouabain-Induced Activation Of Basolateral Na/K-Atpase Receptor Complex, Haiping Cai, Liang Wu, Weikai Qu, Deepak Malhotra, Zijian Xie, Joseph I. Shapiro, Jiang Liu
Regulation Of Apical Nhe3 Trafficking By Ouabain-Induced Activation Of Basolateral Na/K-Atpase Receptor Complex, Haiping Cai, Liang Wu, Weikai Qu, Deepak Malhotra, Zijian Xie, Joseph I. Shapiro, Jiang Liu
Pharmaceutical Science and Research
The long-term effects of ouabain on transepithelial Na+ transport involve transcriptional downregulation of apical Na+/H+ exchanger isoform 3 (NHE3). The aim of this study was to determine whether ouabain could acutely regulate NHE3 via a posttranscriptional mechanism in LLC-PK1 cells. We observed that the basolateral, but not apical, application of ouabain for 1 h significantly reduced transepithelial Na+ transport. This effect was not due to changes in the integrity of tight junctions or increases in the intracellular Na+ concentration. Ouabain regulated the trafficking of NHE3 and subsequently inhibited its activity, a process independent of …