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TRANSPORT OF LYSINE FROM CEREBROSPINAL FLUID OF THE CAT

—The clearance from cerebrospinal fluid of l‐[14C]lysine and l‐[3H]arginine was measured during ventriculo‐cisternal perfusions of anaesthetized cats. Increasing in the perfusate the concentration of unlabelled l‐lysine produced a gradual reduction in clearance of the labelled amino acids without altering the uptake of l‐[14C]lysine by the choroid plexus. Net transport of l‐lysine out of cerebrospinal fluid occurred by saturable and non‐saturable components. The saturable component satisfied Michaelis‐Menton kinetics, while the behaviour of the non‐saturable component was consistent with diffusion. A Vmax of 0·017 μmol/min and an affinity constant (kt) of 0·83 mm were estimated.