STIMULATION OF SYNAPTOSOMAL PROLINE UPTAKE BY SERUM ALBUMIN

Abstract
Abstract— The accumulation of proline by synaptosomal fractions from adult brain cortices is strongly stimulated by serum albumin. Albumin at a concentration of 1 mg/ml increased the recovery of proline from the fraction by approx 2‐fold. This effect was not due to any contaminant but rather due to the albumin molecule itself. Several other proteins tested failed to stimulate synaptosomal accumulation of proline, indicating that the stimulation due to albumin is not a general protein effect. The possibility that albumin stimulates synaptosomal proline accumulation by virtue of its fatty acid binding property is discussed.