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The permeability of capillaries was investigated utilizing an in vivo injection of horseradish peroxidase (HRP) and an in situ perfusion of a balanced salt solution containing HRP and lanthanum chloride. In the continuous capillaries of heart and muscle, HRP diffuses mainly through intercellular junctions, while in testicular capillaries, the transport is via micropinocytotic vesicles. The diffusion and micropinocytotic transport of HRP was demonstrated in both directions, i.e. from the capillary lumen to the interstitium and vice versa. Lanthanum can be used as a bidirectional inhibitor of micropinocytosis. The transport of HRP is then almost completely hindered in testicular capillaries. In heart muscle, the effect on HRP transport is not significant, due to second transport pathway, i.e. intercellular cleft passage.
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