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The transport of halide ions across the membrane of distal rat tubules.

The transport mechanism for chloride was studied in rat distal tubules with a free-flow micro-puncture technique. The tubular fluid to plasma concentration ratio (TF/P) was determined simultaneously for sodium, potassium, chloride and iodide. The experiments were designed to determine whether there is a common active carrier mechanism for halide transport out of the distal tubules with a higher affinity for iodide than for chloride. If such a transport system exists it should give rise to a lower TF/P value for iodide than for chloride. However, the TF/P value for iodide was 0.78 and was significantly higher than for chloride (0.39), a result which is interpreted to mean that no such active carrier transport mechanism for halides exists in the distal tubules. In our opinion the differences in TF/P values depended on a lower passive permeability for iodide than for chloride.