Cyclocreatine Phosphate, an Analogue of Creatine Phosphate, Does not Improve Hypoxic Tolerance in Mice

Abstract: Dietary cyclocreatine has been reported to increase brain highenergy stores in mice and to prolong the generation and utilization of these stores following decapitation. A possible cerebral protective action after 50 days of dietary cyclocreatine 0.5% and 1.0% was therefore examined in mice. Cyclocreatine 0.5% did not increase survival time during hypoxia (5% 0₂). Cyclocreatine 1.O% in the absence of hypoxia caused significant mortality and decreased weight in survivors despite prophylactic antibiotic treatment. Dietary cyclocreatine offers no cerebral protection against hypoxia in mice.