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Studies on compensatory adaptation of renal functions
The Yale Journal of Biology and Medicine
|May 1, 1978
Summary
When one kidney is excluded, the remaining kidney rapidly increases water and electrolyte excretion. This compensatory adaptation appears localized to the proximal tubule, unaffected by hormones or volume changes.
Area of Science:
- Nephrology
- Renal Physiology
- Comparative Physiology
Background:
- The kidney's ability to adapt and compensate for functional loss is crucial for maintaining homeostasis.
- Understanding the mechanisms of compensatory renal adaptation is vital for treating kidney diseases.
Purpose of the Study:
- To investigate the compensatory changes in water and electrolyte excretion in a single kidney following the exclusion of its contralateral partner.
- To identify the specific renal tubule segment responsible for this compensatory adaptation.
Main Methods:
- Studies were conducted on anesthetized dogs and rabbits with complete clamping of the contralateral kidney pedicle or ureter.
- The effects of furosemide and acetazolamide on compensatory adaptation were evaluated.
- Renal function parameters including free-water reabsorption were assessed.
Main Results:
- Exclusion of one kidney led to a rapid increase in water, sodium, potassium, chloride, calcium, phosphate, and bicarbonate excretion by the remaining kidney.
- This response occurred even in denervated kidneys, suggesting a non-neural mechanism.
- Acetazolamide blunted the adaptation, while furosemide did not prevent it, indicating proximal tubule involvement.
- Free-water reabsorption remained normal, and compensatory adaptation was observed in young rabbits.
Conclusions:
- Compensatory adaptation of electrolyte and water excretion following contralateral kidney exclusion is primarily located in the proximal tubule.
- This adaptation is independent of extracellular fluid volume, plasma composition, glomerular filtration rate, renal plasma flow, aldosterone, or vasopressin levels.