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REGULATION OF PYRUVATE KINASE IN THE RAT CEREBRAL CORTEX 1

—The distribution of pyruvate kinase (ATP: pyruvate phosphotransferase; EC 2.7.1.40) in several areas of the central nervous system, the ontogenic changes in the cerebro‐cortical enzyme, and its modulation by certain metabolites were investigated in the rat. No significant differences in activity of pyruvate kinase in different regions of the nervous system were detected when activity was expressed per g of tissue. Studies on the ontogeny of pyruvate kinase in cerebral cortex revealed extremely low levels of enzymic activity at birth. A two‐fold increase occurred between 1 and 20 days of postnatal age, with a further two‐fold increase between 20 and 60 days of age.