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Related Concept Videos

Glomerular Filtration01:15

Glomerular Filtration

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The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
Components of the Filtration Membrane
The filtration process involves three key layers: the glomerular endothelial cells, the basement membrane, and the podocyte-formed filtration slits.
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Glomerular Filtration: Net Filtration Pressure01:26

Glomerular Filtration: Net Filtration Pressure

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Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP).
GBHP, with an average value of 55 mmHg, promotes filtration by pushing water and solutes through the filtration membrane. This is balanced by two opposing forces: CHP, a "back pressure" exerted against the filtration membrane by fluid already in the capsular space and renal...
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Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

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The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
The myogenic...
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Renal Drug Excretion: Glomerular Filtration01:02

Renal Drug Excretion: Glomerular Filtration

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The kidney serves as the primary organ responsible for eliminating drugs and their metabolites from the body. This process, known as renal elimination, starts with glomerular filtration and results in urine formation. Each kidney houses millions of functional units called nephrons, where urine production occurs. A nephron has two main components: a renal corpuscle and a renal tubule.
Drugs gain access to the kidney via the renal artery, which progressively branches off into afferent arterioles....
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Drug Elimination by Renal Route: Glomerular Filtration01:17

Drug Elimination by Renal Route: Glomerular Filtration

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The kidney serves as the primary organ responsible for eliminating drugs and their metabolites from the body. This process, known as renal elimination, starts with glomerular filtration and results in urine formation. Each kidney houses millions of functional units called nephrons, where urine production takes place. A nephron has two main components: a renal corpuscle and a renal tubule. Drugs gain access to the kidney via the renal artery, which progressively branches off into afferent...
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Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration01:29

Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration

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The kidneys are vital organs responsible for regulating blood filtration, waste excretion, and fluid balance, all of which are crucial for maintaining homeostasis. Renal physiology examines renal blood flow, glomerular filtration, and urine formation, ensuring the body’s internal environment remains stable.Renal Blood FlowThe kidneys receive about 20-25% of the cardiac output, typically around 1200 mL of blood per minute in an average adult. Blood flows into the kidneys through the renal...
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Transdermal Measurement of Glomerular Filtration Rate in Mice
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Novel glomerular filtration markers.

Jaya A George1, Verena Gounden2

  • 1Department of Chemical Pathology, Faculty of Health Sciences, University of Witwatersrand and National Health Laboratory Services, Johannesburg, South Africa.

Advances in Clinical Chemistry
|January 8, 2019
PubMed
Summary
This summary is machine-generated.

Researchers are exploring novel biomarkers beyond creatinine to improve chronic kidney disease (CKD) detection. Combining multiple markers may enhance diagnostic accuracy for kidney function and disease progression.

Keywords:
Cystatin CGFRKIM-1NGALmiRNAβ2-microglobulin

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Area of Science:

  • Nephrology
  • Biomarker Discovery
  • Diagnostic Medicine

Background:

  • Current chronic kidney disease (CKD) assessment relies on estimated glomerular filtration rate (eGFR), primarily using creatinine.
  • Creatinine measurements can be affected by factors other than glomerular filtration rate (GFR), necessitating alternative markers.
  • Tubular damage may precede impaired GFR, highlighting the need for markers of tubular injury.

Purpose of the Study:

  • To review emerging biomarkers for assessing chronic kidney disease (CKD).
  • To discuss the potential of novel markers and marker combinations for improved CKD detection and prognosis.
  • To highlight the challenges in standardizing new biomarkers compared to traditional measures.

Main Methods:

  • Review of existing literature on established and novel biomarkers for CKD.
  • Analysis of studies investigating cystatin C, low molecular weight proteins (e.g., NGAL, KIM-1), dimethylarginines, microRNAs, and metabolomics.
  • Examination of evidence linking these analytes to GFR, disease stage, and mortality.

Main Results:

  • Alternative markers like cystatin C, β2-microglobulin, beta trace protein, NGAL, KIM-1, and N-acetyl-β-d-glucosaminidase are being investigated.
  • Dimethylarginines, particularly symmetric dimethylarginine, show potential as markers for renal disease progression.
  • Emerging techniques like microRNA analysis and metabolomics offer new avenues for understanding CKD pathophysiology.
  • Preliminary evidence suggests these markers correlate with GFR, disease stage, and mortality, but standardization remains a challenge.

Conclusions:

  • Novel biomarkers and panels show promise for enhancing CKD detection and monitoring.
  • Standardization of new biomarkers is crucial for their clinical adoption and reliable interpretation.
  • Further research is needed to validate these markers and integrate them into clinical practice for improved patient outcomes.