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Assessment of Kidney Function in Mouse Models of Glomerular Disease
Published on: June 30, 2018
Kidney function in the Spinifex hopping mouse, Notomys alexis
1Animal Science, School of Rural Science and Agriculture, University of New England, Armidale, NSW 2351, Australia.
Summary
The Spinifex hopping mouse (Notomys alexis) rapidly concentrates urine and conserves water when deprived, outperforming laboratory mice. This adaptation is crucial for survival in arid Australian environments.
Area of Science:
- Physiology
- Comparative Anatomy
- Renal Function
Background:
- Notomys alexis inhabits arid Australia, necessitating efficient water conservation.
- Kidney structure and function are key to water balance in desert-dwelling species.
- Understanding renal adaptations aids in comprehending survival strategies in extreme environments.
Purpose of the Study:
- To investigate the rate of urine concentration and volume reduction in Notomys alexis during water deprivation.
- To examine the renal response to rehydration after water deprivation.
- To compare the water-saving capabilities of N. alexis with the laboratory mouse (Mus musculus domesticus).
Main Methods:
- Experimental water deprivation and rehydration protocols were applied to N. alexis and M. m. domesticus.
- Urine volume, electrolyte, and solute concentrations were measured.
- Plasma electrolyte concentrations and glomerular filtration rate were monitored.
- Body weight changes were assessed to evaluate survival under water stress.
Main Results:
- N. alexis demonstrated a faster reduction in urine volume and increase in urine concentration compared to M. m. domesticus.
- These rapid renal adjustments in N. alexis occurred independently of changes in plasma electrolytes or glomerular filtration rate.
- N. alexis successfully adapted to gradual water deprivation, maintaining urine composition similar to well-hydrated states, while M. m. domesticus required water supplementation.
- Following rehydration, N. alexis rapidly produced dilute urine, contrasting with expectations for species with highly concentrated medullas.
Conclusions:
- Notomys alexis possesses superior rapid urine concentrating and diluting abilities compared to Mus musculus domesticus, crucial for arid survival.
- The physiological control of renal function in N. alexis is complex, allowing rapid adaptation to water scarcity and rehydration.
- These findings highlight specialized renal adaptations in N. alexis for extreme environments, surpassing those of the laboratory mouse.
