Abstract
We studied the brain metabolism in macular mutant mice (Ml/y, +/y), an appropriate model of Menkes kinky hair disease, using 31P-and 1H-NMR spectroscopy to clarify the pathophysiological mechanism of disturbed nervous function.
An analysis of in vivo 31P-NMR spectra showed a decreased phosphocreatine (PCr)/inorganic phosphate (Pi) ratio and decreased ATP levels and decreased intracellular pH in Ml/y mice at 9 days, suggesting energy failure in the brain. This associated decline in ATP levels may reflect multiple causative factors including disturbed mitochondrial respiration and ischemia secondary to circulatory failure.
Brain metabolites, including PCr, creatine, lactate and 7 amino acids were easily detectable quantitatively and qualitatively by in vitro 1H-NMR spectrum. An elevation in lactate levels and a decline in PCr/creatine ratio in Ml/y mice at 9 days were also noted with an in vitro study, supporting the in vivo data.
NMR spectroscopy is a useful and promising tool to obtain the information on brain metabolism
