Renal water transport in health and disease.
Level 5 - mechanism / opinion, no new human data
Narrative review describing physiological mechanisms and clinical disorders without original empirical data or systematic search methodology.
PubMed 35678906 · doi:10.1007/s00424-022-02712-9
What was done
This narrative review summarizes the physiological, molecular, and hormonal mechanisms governing renal water reabsorption along different nephron segments, describes relevant drug classes (classical diuretics, SGLT2 inhibitors, and V2 receptor antagonists), and outlines disorders of water balance (diabetes insipidus and hyponatremia).
What was found
The abstract reports established physiological proportions: proximal tubules and thin descending limbs reabsorb 70% and 20% of filtered water, respectively, utilizing aquaporin-1; paracellular transport via claudin-2 accounts for at least 30% of proximal tubule reabsorption. The collecting duct mediates final water balance via arginine-vasopressin-stimulated apical translocation of aquaporin-2 alongside basolateral aquaporin-3 and -4. No original experimental data or novel quantitative trial findings are reported.
Why it matters
It provides a concise conceptual framework linking molecular water channels and vasopressin physiology to the mechanisms of diuretic and aquaretic pharmacology and clinical fluid-balance disorders.
Limits
The paper is a non-systematic narrative review. It provides no primary clinical or laboratory data, sample sizes, search strategy details, or statistical synthesis.
Cited by
- supports Vasopressin acts as an antidiuretic hormone that reduces urine excretion.