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We report regional rates of cerebral protein synthesis (rCPS) in 10 healthy young males, each studied under two conditions: awake and anesthetized with propofol. We used the quantitative L-[1-(11)C]leucine positron emission tomography (PET) method to measure rCPS. The method accounts for the fraction (lambda) of unlabeled leucine in the precursor pool for protein synthesis that is derived from arterial plasma; the remainder comes from proteolysis of tissue proteins. Across 18 regions and whole brain, mean differences in rCPS between studies ranged from -5% to 5% and were within the variability of rCPS in awake studies (coefficient of variation range: 7% to 14%). Similarly, differences in lambda (range: 1% to 4%) were typically within the variability of lambda (coefficient of variation range: 3% to 6%). Intersubject variances and patterns of regional variation were also similar under both conditions. In propofol-anesthetized subjects, rCPS varied regionally from 0.98+/-0.12 to 2.39+/-0.23 nmol g(-1) min(-1) in the corona radiata and in the cerebellum, respectively. Our data indicate that the values, variances, and patterns of regional variation in rCPS and lambda measured by the L-[1-(11)C]leucine PET method are not significantly altered by anesthesia with propofol.

journal of cerebral blood flow and metabolism

Propofol Anesthesia Does Not Alter Regional Rates of Cerebral Protein Synthesis Measured with <scp>l</scp>-[1-<sup>11</sup>C]Leucine and PET in Healthy Male Subjects

Propofol Anesthesia Does Not Alter Regional Rates of Cerebral Protein Synthesis Measured with l-[1-11C]Leucine and PET in Healthy Male Subjects

Propofol Anesthesia Does Not Alter Regional Rates of Cerebral Protein Synthesis Measured with l-[1-¹¹C]Leucine and PET in Healthy Male Subjects