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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
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Glomerular Filtration: Net Filtration Pressure01:26

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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 Corpuscle01:20

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The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
Glomerulus: Structure and Function
The glomerulus is a tiny, intricate network of capillaries located at the beginning of the nephron. It's enveloped by the Bowman's capsule and receives its blood supply from an afferent arteriole, which divides into numerous...
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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

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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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[Models of glomerular filtration barrier : New developments].

Mahamadou Dembele1, Marion Delafosse1, Nadhir Yousfi1

  • 1Inserm, Sorbonne Université, Maladies rénales fréqunentes et rares (CoRaKiD), UMRS 1155, Hôpital Tenon, Bâtiment recherche, 4 rue de la Chine, 75020 Paris, France.

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Researchers are developing advanced in vitro models of the glomerular filtration barrier to reduce animal testing. Innovations utilize stem cells and bioengineering for more physiologically relevant models.

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Area of Science:

  • Nephrology
  • Regenerative Medicine
  • Bioengineering

Background:

  • Growing demand for in vitro models of the glomerular filtration barrier to reduce animal use.
  • Limitations in current in vitro models necessitate improved physiological relevance.

Purpose of the Study:

  • To present innovations in generating in vitro models of the glomerular filtration barrier.
  • To highlight advancements in stem cell technology and bioengineering for kidney research.

Main Methods:

  • Utilizing induced pluripotent stem cells to generate glomerular cells, particularly podocytes.
  • Employing bioengineering and tissue engineering approaches for model development.
  • Co-culturing glomerular cells, integrating biomaterials, and using microfluidics to mimic the glomerular microenvironment.

Main Results:

  • Development of novel methods to overcome limitations of existing glomerular cell-based models.
  • Successful generation of podocytes from stem cells.
  • Demonstration of strategies to enhance the physiological relevance of in vitro glomerular models.

Conclusions:

  • Stem cell technology and bioengineering offer promising avenues for creating advanced in vitro glomerular filtration barrier models.
  • Mimicking the glomerular microenvironment is crucial for maintaining glomerular cell phenotype in vitro.
  • These innovations contribute to reducing reliance on animal models in kidney research.