Uptake of D‐serine by synaptosomal P2 fraction isolated from rat brain

Abstract
We have demonstrated that the crude synaptosome P2 fraction prepared from the rat brain is able to accumulate [3H]D-serine in a saturable, temperature-dependent and partially sodium- and potassium-dependent manner with an affinity of a hundred micromolar range. The inhibition profile of D-serine accumulation by various amino acids is different from those of uptake systems reported for glycine and other amino acids. The present data suggest that the endogenous D-serine may be taken up mainly through a carrier-mediated transport system to regulate its extracellular concentration in the mammalian brain. Synapse 42:84–86, 2001.