Abstract
Within the cortex region of the neonatal rabbit kidney the developing microvasculature was investigated by means of two endothelium-detecting antibodies (EnPo 1 and EC1). Rows of antibody-labelled cells were found within tissue regions that had previously been described as avascular. We conclude that these vessel-like structures detected by EnPo 1 and EC1 are capillary precursors without lumina. Furthermore, beneath the fibrous capsule within the morphologically homogeneous mesenchyme two cell populations can be discriminated by use of differential antigen expression. The EnPo 1 antigen, which is abundant on endothelial cells and podocytes at different developmental stages, was detected on a subpopulation of mesenchymal cells. These cells were exclusively detected surrounding the tip of the collecting duct ampulla. Due to the unique specificity of EC1 and EnPo 1 the process of microvascular development can be readily followed on serial optical sections gained by laser scan microscopy. (1) Adjacent to EnPo 1-positive mesenchymal cell islets vessel-like structures are found that are in contact with the differentiated vasculature. (2) The renal vesicle is enclosed by a network of vessel-like structures establishing contact with differentiated vessels. (3) No guidance of invading capillary sprouts toward the developing glomerulus and nephron is required, since vascular elements already accompany the earliest detectable nephron stage.
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Kloth, S., Aigner, J., Schmidbauer, A. et al. Interrelationship of renal vascular development and nephrogenesis. Cell Tissue Res 277, 247–257 (1994). https://doi.org/10.1007/BF00327772
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DOI: https://doi.org/10.1007/BF00327772