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Wnt and planar cell polarity signaling in cystic renal disease
1Mammalian Genetics Unit; MRC Harwell; Oxfordshire, UK.
Abstract:
Cystic kidney diseases can cause end stage renal disease, affecting millions of individuals worldwide. They may arise early or later in life, are characterized by a spectrum of symptoms and can be caused by diverse genetic defects. The primary cilium, a microtubule-based organelle that can serve as a signaling antenna, has been demonstrated to have a significant role in ensuring correct kidney development and function. In the kidney, one of the signaling pathways that requires the cilium for normal development is Wnt signaling. In this review, the roles of primary cilia in relation to canonical and non-canonical Wnt/PCP signaling in cystic renal disease are described. The evidence of the associations between cilia, Wnt signaling and cystic renal disease is discussed and the significance of planar cell polarity-related mechanisms in cystic kidney disease is presented. Although defective Wnt signaling is not the only cause of renal disease, research is increasingly highlighting its importance, encouraging the development of Wnt-associated diagnostic and prognostic tools for cystic renal disease.
Insights
Primary cilia are crucial for kidney development and function. Dysregulation of Wnt signaling involving these cilia is increasingly linked to cystic kidney diseases, suggesting new diagnostic and prognostic tools.
Area of Science:
- Nephrology
- Cell Biology
- Developmental Biology
Background:
- Cystic kidney diseases affect millions globally, leading to end-stage renal disease.
- These conditions stem from diverse genetic defects and manifest with varied symptoms.
- The primary cilium, a cellular antenna, is vital for kidney development and function.
Purpose of the Study:
- To review the role of primary cilia in Wnt signaling pathways within the context of cystic kidney diseases.
- To discuss the association between cilia, Wnt signaling, and the pathogenesis of renal cystic diseases.
- To highlight the significance of planar cell polarity mechanisms in cystic kidney disease.
Main Methods:
- Literature review focusing on primary cilia, Wnt/PCP signaling, and cystic renal diseases.
- Synthesis of evidence linking cilia dysfunction to Wnt pathway alterations in kidney disease.
- Analysis of the role of planar cell polarity in the development of renal cysts.
Main Results:
- Primary cilia are essential for canonical and non-canonical Wnt signaling in kidney development.
- Defects in cilia-mediated Wnt signaling are implicated in the pathogenesis of various cystic kidney diseases.
- Planar cell polarity pathways are significantly involved in the mechanisms underlying cystic kidney disease.
Conclusions:
- Wnt signaling, modulated by primary cilia, plays a critical role in kidney development and disease.
- Understanding the interplay between cilia and Wnt pathways offers insights into cystic renal disease.
- Further research into Wnt-associated mechanisms may lead to novel diagnostic and prognostic tools for cystic kidney disease.
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Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...