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Self-organized Kidney Rudiments: Prospects for Better in vitro Nephrotoxicity Assays
1Centre for Integrative Physiology, University of Edinburgh, Edinburgh, UK.
Abstract:
Kidneys are essential to life but vulnerable to a range of toxicants, including therapeutic drugs and their metabolites. Indeed, nephrotoxicity is often a limiting factor in both drug use and drug development. Most toxicants damage kidneys by one of four mechanisms: damage to the membrane and its junctions, oxidative stress and free radical generation, activation of inflammatory processes, and interference with vascular regulation. Traditionally, animal models were used in preclinical screening for nephrotoxicity, but these can be poorly predictive of human reactions. Animal screens have been joined by simple single-cell-type in vitro assays using primary or immortalized human cells, particularly proximal tubule cells as these are especially vulnerable to toxicants. Recent research, aimed mainly at engineering new kidneys for transplant purposes, has resulted in a method for constructing anatomically realistic mini-kidneys from renogenic stem cells. So far, this has been done only using renogenic stem cells obtained directly from mouse embryos but, in principle, it should be possible to make them from renogenically directed human-induced pluripotent cells. If this can be done, the resulting human-based mini-kidneys would be a promising system for detecting some types of nephrotoxicity and for developing nephroprotective drugs.
Insights
New mini-kidney models engineered from stem cells show promise for detecting drug-induced kidney damage (nephrotoxicity) and developing protective therapies, improving upon traditional animal models.
Area of Science:
- Nephrology
- Toxicology
- Stem Cell Biology
Background:
- Kidneys are vital organs susceptible to damage from drugs and environmental toxicants.
- Nephrotoxicity is a significant challenge in drug development and clinical use.
- Current methods for assessing nephrotoxicity, including animal models and single-cell assays, have limitations in predicting human responses.
Purpose of the Study:
- To explore the potential of engineered mini-kidneys for nephrotoxicity screening.
- To evaluate novel approaches for developing nephroprotective drugs.
- To advance kidney research and regenerative medicine.
Main Methods:
- Utilizing renogenic stem cells to construct anatomically realistic mini-kidney structures.
- Investigating the application of these mini-kidneys in preclinical nephrotoxicity assessment.
- Exploring the potential use of human-induced pluripotent stem cells for creating patient-specific mini-kidneys.
Main Results:
- Development of a method to engineer mini-kidneys from renogenic stem cells.
- Demonstration of mini-kidneys as a potentially more predictive model for human nephrotoxicity compared to traditional methods.
- Identification of engineered mini-kidneys as a promising platform for drug discovery and development.
Conclusions:
- Engineered mini-kidneys represent a significant advancement in modeling human kidney function and disease.
- This technology offers a novel in vitro system for evaluating drug safety and efficacy.
- Further research using human-induced pluripotent stem cells could lead to personalized nephrotoxicity testing and drug development.
