The effects of hyperbaric oxygen on uracil nucleotide metabolism in B104 rat neuroblastoma cells were investigated. Cells exposed to 10 atm O2 for 4 h incorporated markedly less [3H]uridine into the acid-soluble fraction and RNA compared to cells kept in ambient air. The acid-soluble fraction of the oxygen-treated cells contained less total [3H]uridine phosphates ([3H]UMP + [3H]UDP + [3H]UTP) than air-treated cells. Uridine kinase activity, assayed in cytosolic extracts from cells exposed to 10 atm O2 for 4 h, was decreased by 46% compared to the air controls. The reduced enzyme activity which appears to account for the depressed [3H]uridine incorporation, may contribute to the lethal effects of oxygen in these cells.

Gendimenico, Haugaard, , , , , , , (1990). Adverse effects of hyperbaric oxygen on [3H]uridine incorporation and uridine kinase activity in B104 rat neuroblastoma cells. Molecular and cellular biochemistry, 1990 Jun;95(1):71-6. https://www.ncbi.nlm.nih.gov/pubmed/2164139