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Related Concept Videos

Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
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Renal Regulation of Acid-Base Balance

Metabolic reactions in the body produce nonvolatile acids, such as sulfuric acid, which generate an acid load of approximately 1 mEq of H+ per kilogram of body weight daily. Excreting H+ in the urine is essential to balance this acid load.
In the kidneys, cells within the proximal convoluted tubules (PCT) and the collecting ducts secrete hydrogen ions (H+) into the tubular fluid. Specifically, in the PCT, Na+/H+ antiporters secrete H+ while reabsorbing Na+.
However, the intercalated cells in...
Renal Drug Excretion: Tubular Secretion01:28

Renal Drug Excretion: Tubular Secretion

Active tubular secretion is a robust, energy-demanding process that utilizes carrier systems to transport drugs into renal tubules. The active renal secretion systems include the organic anion transporter (OAT) for weak acids and the organic cation transporter (OCT) for weak bases. Structurally similar drugs can compete for the same transporter, potentially leading to drug accumulation and toxicity. However, this principle can be exploited therapeutically. One example is probenecid (Probalan),...
Drug Elimination by Renal Route: Tubular Reabsorption01:22

Drug Elimination by Renal Route: Tubular Reabsorption

During the process of renal excretion, as the glomerular filtrate progresses to the distal convoluted tubule (DCT), drugs that are highly permeable, lipophilic, and nonionized undergo passive reabsorption from the tubular fluid into the surrounding peritubular capillaries. This reabsorption process restricts their elimination through the kidneys. However, the majority of drugs are either weak acids or weak bases, and their ionization level is dependent on pH. By altering the pH of urine, the...
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Acute Kidney Injury IV: Diagnostic Studies and Prevention

Accurate diagnosis and effective prevention are critical in managing Acute Kidney Injury (AKI), which is linked to high mortality rates ranging from 10% to 80%. Timely recognition of at-risk patients and careful monitoring can significantly reduce the likelihood of kidney damage.Diagnostic Assessments:The diagnostic process starts with a comprehensive medical history to identify prerenal, intrarenal, and postrenal causes.Prerenal causes, such as dehydration, hypotension, or blood loss, should...
Renal Drug Excretion: Tubular Reabsorption01:25

Renal Drug Excretion: Tubular Reabsorption

Tubular reabsorption, a process occurring post-glomerular filtration of drugs in the renal tubule, is a critical determinant of drug half-life. During the process of renal excretion, as the glomerular filtrate progresses to the distal convoluted tubule (DCT), drugs that are highly permeable, lipophilic, and nonionized undergo passive reabsorption from the tubular fluid into the surrounding peritubular capillaries. This reabsorption process restricts their elimination through the kidneys. This...

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Isolation, Characterization, And High Throughput Extracellular Flux Analysis of Mouse Primary Renal Tubular Epithelial Cells
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Renal tubular acidosis--underrated problem?

Edyta Golembiewska1, Kazimierz Ciechanowski

  • 1Department of Nephrology, Transplantology and Internal Medicine, Pomeranian Medical University, Szczecin, Poland. irys@pum.edu.pl

Acta Biochimica Polonica
|June 14, 2012
PubMed
Summary

Renal tubular acidosis (RTA) is a kidney condition causing metabolic acidosis. Understanding genetic mutations and acquired causes is key, as new treatments beyond oral alkali are needed.

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Area of Science:

  • Nephrology
  • Genetics
  • Biochemistry

Background:

  • Renal tubular acidosis (RTA) is a metabolic disorder characterized by hyperchloremic metabolic acidosis with a normal anion gap and glomerular filtration rate.
  • RTA can be inherited as an isolated defect or part of a broader tubule dysfunction, such as Fanconi syndrome.
  • Acquired forms of RTA are common, often linked to drug use, autoimmune diseases, or kidney transplantation.

Purpose of the Study:

  • To review the genetic basis of inherited RTA.
  • To discuss the common acquired causes of RTA.
  • To highlight the need for novel therapeutic strategies for RTA.

Main Methods:

  • Review of genetic mutations associated with RTA, including SLC4A4, SLC4A1, ATP6B1, and CA2.
  • Analysis of factors contributing to acquired RTA.
  • Discussion of current treatment limitations and future therapeutic directions.

Main Results:

  • Identification of multiple gene mutations (SLC4A4, SLC4A1, ATP6B1, CA2) linked to RTA, improving understanding of bicarbonate and H+ transport.
  • Recognition of drug use, autoimmune conditions, and kidney transplantation as frequent causes of acquired RTA.
  • Current treatments primarily involve oral alkali supplementation, with a demand for new therapeutic options.

Conclusions:

  • Advances in genetic research have elucidated the molecular mechanisms underlying inherited RTA.
  • Acquired RTA is prevalent and necessitates further investigation into its diverse etiologies.
  • There is a significant clinical need for the development of novel therapeutic interventions for RTA beyond conventional alkali therapy.