Abstract
Growth of the kidney is a complex process piloted by the collecting duct (CD) ampullae. The dichotomous arborisation and consecutive elongation of this tubular element determines the exact site and time for the induction of nephrons in the overlaying mesenchymal cap condensates. The mechanism by which the CD ampullae find the correct orientation is currently unknown. Recently, we have demonstrated micro-fibres that originate from the basal aspect of the CD ampullae and extend through the mesenchyme to the organ capsule. The micro-fibres are assumed to be involved in the growth and arborisation process of the CD ampulla. Therefore, we have investigated the specific distribution of the micro-fibres during branching morphogenesis. We have also analysed whether the micro-fibres co-localise with extracellular matrix (ECM)-modulating enzymes and whether the co-localisation pattern changes during CD ampulla arborisation. Micro-fibres were detected in all stages of CD ampulla arborisation. Tissue transglutaminase (Tgase2) co-localised with soybean agglutinin (SBA)-positive micro-fibres, whose presence depended upon the degree of CD branching. Matrix metalloproteinase-9 (MMP-9) also co-localised with micro-fibres, but its expression pattern was different from that for Tgase2. Western blotting experiments demonstrated that Tgase2 and MMP-9 co-migrated with SBA-labelled proteins. Thus, the micro-fibres are developmentally modulated by enzymes of the ECM in embryonic kidney cortex. These findings illustrate the importance of micro-fibres in directing CD ampulla growth.
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The technical help of Mrs. L. Denk and Mrs. S. Lukas is gratefully acknowledged. We thank Dr. Hayo Castrop for critical comments.
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Schumacher, K., Klar, J., Wagner, C. et al. Temporal-spatial co-localisation of tissue transglutaminase (Tgase2) and matrix metalloproteinase-9 (MMP-9) with SBA-positive micro-fibres in the embryonic kidney cortex. Cell Tissue Res 319, 491–500 (2005). https://doi.org/10.1007/s00441-004-1028-x
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DOI: https://doi.org/10.1007/s00441-004-1028-x