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- W2336335783 abstract "Intracellular ATP depletion is a hallmark event in ischemic injury. It has been extensively characterized in models of chemical anoxia in vitro. In contrast, the fate of GTP during ischemia remains unknown. We used LLC-PK proximal tubular cells to measure GTP and ATP changes during anoxia. In 45 min, antimycin A decreased ATP and GTP to 8% and 2% of controls, respectively. Ischemia in vivo resulted in comparable reductions in GTP and ATP. After 2 h of recovery, GTP levels in LLC-PK cells increased to 65% while ATP increased to 29%. We also investigated steady-state models of selective ATP or GTP depletion. Combinations of antimycin A and mycophenolic acid selectively reduced GTP to 51% or 25% of control. Similarly, alanosine selectively reduced ATP to 61% or 26% of control. Selective GTP depletion resulted in significant apoptosis. Selective ATP depletion caused mostly necrosis. These models of ATP or GTP depletion can prove useful in dissecting the relative contribution of the two nucleotides to the ischemic phenotype." @default.
- W2336335783 created "2016-06-24" @default.
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- W2336335783 date "2000-10-01" @default.
- W2336335783 modified "2023-10-18" @default.
- W2336335783 title "Modeling ischemia in vitro: selective depletion of adenine and guanine nucleotide pools" @default.
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- W2336335783 doi "https://doi.org/10.1152/ajpcell.2000.279.4.c1270" @default.
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