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Updated: Jul 4, 2026
Multilevel Microdissection and Functional-Structural Profiling of Human Renal Arterial Branches
Published on: September 5, 2025
The renal cortical interstitium: morphological and functional aspects
Brigitte Kaissling1, Michel Le Hir
1Institute of Anatomy, Division Vegetative Anatomy, University of Zürich, Winterthurerstr. 190, 8057, Zurich, Switzerland. brigitte.kaissling@access.uzh.ch
Insights
Kidney fibroblasts and dendritic cells form interconnected networks in the renal interstitium. These cells play crucial roles in kidney structure, function, and the development of renal fibrosis during disease.
Area of Science:
- Nephrology
- Cell Biology
- Immunology
Background:
- The renal interstitium contains fibroblasts and dendritic cells in close proximity.
- Fibroblasts form the kidney's structural "skeleton" and have specific cellular markers.
- Dendritic cells act as sentinels within the mononuclear phagocyte system.
Purpose of the Study:
- To elucidate the structural and functional relationship between renal fibroblasts and dendritic cells.
- To understand the role of these cells in kidney homeostasis and disease progression.
- To explore the potential dual role of fibroblast activation in renal fibrosis.
Main Methods:
- Histological analysis of renal interstitial compartment.
- Immunohistochemical characterization of fibroblasts and dendritic cells.
- Analysis of cellular interactions and signaling pathways.
Main Results:
- Fibroblasts and dendritic cells form contiguous cellular networks in the renal interstitium.
- Fibroblasts exhibit distinct characteristics including F-actin cytoskeleton and specific enzyme expression.
- Dendritic cells express MHC class II and CD11c, indicating immune surveillance function.
- Fibroblast activation, proliferation, and myofibroblast differentiation are observed following injury.
- Increased collagen production by fibroblasts contributes to renal fibrosis.
Conclusions:
- Renal fibroblasts and dendritic cells are key components of the interstitial network with specialized functions.
- Fibroblast activation is central to renal fibrosis development, potentially representing a complex repair response.
- Understanding these cellular interactions is vital for managing chronic kidney disease.
Abstract:
The renal interstitial compartment, situated between basement membranes of epithelia and vessels, contains two contiguous cellular networks. One network is formed by interstitial fibroblasts, the second one by dendritic cells. Both are in intimate contact with each other. Fibroblasts are interconnected by junctions and connected to basement membranes of vessels and tubules by focal adhesions. Fibroblasts constitute the "skeleton" of the kidney. In the renal cortex, fibroblasts produce erythropoietin and are distinguished from other interstitial cells by their prominent F-actin cytoskeleton, abundance of rough endoplasmic reticulum, and by ecto-5'-nucleotidase expression in their plasma membrane. The resident dendritic cells belong to the mononuclear phagocyte system and fulfil a sentinel function. They are characterized by their expression of MHC class II and CD11c. The central situation of fibroblasts suggests that signals from tubules, vessels, and inflammatory cells converge in fibroblasts and elicit an integrated response. Following tubular damage and inflammatory signals fibroblasts proliferate, change to the myofibroblast phenotype and increase their collagen production, potentially resulting in renal fibrosis. The acquisition of a profibrotic phenotype by fibroblasts in renal diseases is generally considered a main causal event in the progression of chronic renal failure. However, it might also be seen as a repair process.
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