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Journal Article
Review
The importance of the thick ascending limb of Henle's loop in renal physiology and pathophysiology.
The thick ascending limb (TAL) of Henle's loop is a crucial segment for many tasks of the nephron. Indeed, the TAL is not only a mainstay for reabsorption of sodium (Na+ ), potassium (K+ ), and divalent cations such as calcium (Ca2+ ) and magnesium (Mg2+ ) from the luminal fluid, but also has an important role in urine concentration, overall acid-base homeostasis, and ammonia cycle. Transcellular Na+ transport along the TAL is a prerequisite for Na+ , K+ , Ca2+ , Mg2+ homeostasis, and water reabsorption, the latter through its contribution in the generation of the cortico-medullar osmotic gradient. The role of this nephron site in acid-base balance, via bicarbonate reabsorption and acid secretion, is sometimes misunderstood by clinicians. This review describes in detail these functions, reporting in addition to the well-known molecular mechanisms, some novel findings from the current literature; moreover, the pathophysiology and the clinical relevance of primary or acquired conditions caused by TAL dysfunction are discussed. Knowing the physiology of the TAL is fundamental for clinicians, for a better understanding and management of rare and common conditions, such as tubulopathies, hypertension, and loop diuretics abuse.
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