Abstract
We have used monoclonal antibodies to study the changes in the expression of four kidney antigens during organogenesis in the sheep. Two of these antibodies, EE24.6 and EJ30.1, label intensely only the adult kidney, whereas the other two, EK17.1 and EJ15.1, bind to the extracellular matrix of the embryonic kidney. For EJ15.1, the staining of the extracellular matrix decreases temporarily during the second half of intrauterine life, a period during which a light staining appears in the mesangium. For the other, EK17.1, the extracellular matrix staining in the stroma gradually decreases as the embryo grows, while staining of the mesangium and the arterial intima becomes evident. With EK17.1, fibronectin is identified in the extracellular matrix of the embryonic kidney and intracellularly in the mesangial cells after these cells have colonized the glomerulus. The mesonephros staining seems to be the same as that of the metanephros. In the adult, extraglomerular vascular endothelial cells bind EK17.1, whereas intraglomerular endothelial cells do not express fibronectin, which suggests a functional difference between endothelial cells in these two localizations.
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