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Hypotaurine uptake by the retina

A study of the transport of 3H‐hypotaurine by rat retina has been carried out. The process is markedly sodium and temperature dependent. Kinetic analysis of the data revealed two values for the affinity constant (K) of 4.91 μM and 1,071.3 μM. Some related and unrelated amino acids were examined as competitive inhibitors of 3H‐hypotaurine transport. Only GABA and β‐alanine exhibited appreciable inhibitory activity. Taurine, glycine, and guanidine ethane sulfonate were not inhibitors.