Utilization of the Synthetic Phosphagen Cyclocreatine Phosphate by a Simple Brain Model During Stimulation by Neuroexcitatory Amino Acids
- 1 May 1988
- journal article
- research article
- Published by Wiley in Journal of Neurochemistry
- Vol. 50 (5), 1640-1647
- https://doi.org/10.1111/j.1471-4159.1988.tb03054.x
Abstract
The ability of 1-carboxymethyl-2-amino-3-phosphonoimidazolidine (cyclocreatine-P), accumulated by a simple brain model, to function as a supplemental synthetic phosphagen and respond to the decreases in cytosolic ATP/free ADP ratios that occur during prolonged stimulation by various excitatory amino acids was investigated. Suspensions of chopped whole brain from 11-to 14-day-old chick embryos were incubated with 30 mM cyclocreatine for 90 min, resulting in accumulation of 100 .mu.mol/g dry weight of cyclocreatine-P, and then incubated for up to 1 h with a series of excitatory amino acids of widely differing potencies. Under these conditions net utilization of cyclocreatine-P was detected in the response to stimulation by the following neuroexcitatory compounds at the indicated threshold concentrations: kainate (20 .mu.M), N-methyl-DL-aspartate (20 .mu.M), L-homocysteate (20 .mu.M), L-glutamate (200 .mu.M), D-glutamate (200 .mu.M), L-aspartate (2 mM), DL-2-amino-3-phosphonopropionate (2 mM), and DL-2-amino-4-phosphonobutyrate (2 mM). Significant increases in water content of chick embryo brain minces accompanied stimulated by excitatory amino acids. It is suggested that changes in water content or cyclocreatine-P levels in this sensitive brain model might be utilized in automatable screening procedures for detecting novel antagonists and/or new agonists of excitatory amino acids.Keywords
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