Related Experiment Video

Updated: Aug 8, 2026

Glomerular Outgrowth as an Ex Vivo Assay to Analyze Pathways Involved in Parietal Epithelial Cell Activation
06:39

Glomerular Outgrowth as an Ex Vivo Assay to Analyze Pathways Involved in Parietal Epithelial Cell Activation

Published on: August 19, 2020

The bioactivity of plasma factors in focal segmental glomerulosclerosis

Joanna Marszal1, Moin A Saleem

  • 1Academic and Children's Renal Unit, University of Bristol, Southmead Hospital, Bristol, UK.

Nephron. Experimental Nephrology
|May 19, 2006
PubMed

Insights

Researchers are investigating a circulating factor causing Focal Segmental Glomerulosclerosis (FSGS), a kidney disease. New insights into podocyte biology and advanced protein identification may finally reveal the cause of this condition.

Area of Science:

  • Nephrology
  • Immunology
  • Biochemistry

Background:

  • Focal segmental glomerulosclerosis (FSGS) is a severe nephrotic syndrome leading to end-stage renal failure.
  • The cause of FSGS is hypothesized to involve circulating factors, potentially immune-related.
  • Current therapies for FSGS are often toxic and ultimately fail.

Purpose of the Study:

  • To identify the circulating factor(s) responsible for FSGS.
  • To understand the role of podocytes and key molecules in FSGS pathogenesis.
  • To leverage recent technological advancements for disease mechanism discovery.

Main Methods:

  • Utilizing an in vitro assay measuring glomerular permeability using patient plasma.
  • Testing plasma fractions for permeability-inducing activity.
  • Analyzing podocyte biology and identifying key molecular players.

Main Results:

  • An in vitro assay for glomerular permeability has been developed but has not yet identified a specific factor.
  • Animal studies attempting to replicate FSGS with patient plasma yielded inconsistent results.
  • Emerging evidence suggests potential inhibitory or missing factors in patient plasma.

Conclusions:

  • The podocyte is recognized as the primary target cell in FSGS.
  • Advances in protein identification offer new possibilities for discovering the underlying cause of FSGS.
  • Further research integrating podocyte biology and proteomic technologies is crucial for understanding FSGS.

More Related Videos

Identification of the Source of Secreted Proteins in the Kidney by Brefeldin A Injection10:15

Identification of the Source of Secreted Proteins in the Kidney by Brefeldin A Injection

Published on: November 10, 2021

Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway07:15

Mechanism of Kemeng Fang's Inhibition of Podocyte Apoptosis in Rats with Membranous Nephropathy through the PI3K/AKT Signaling Pathway

Published on: August 23, 2024

Related Concept Videos

Factors Affecting Renal Clearance: Drug's Physicochemical Properties and Plasma Levels01:31

Factors Affecting Renal Clearance: Drug's Physicochemical Properties and Plasma Levels

Renal clearance of a drug is influenced by various factors, including its physicochemical properties and plasma levels. These factors play a significant role in determining how efficiently the kidneys eliminate a drug.
One important factor is the drug's molecular size. The kidneys readily excrete smaller molecules below 300 Daltons (Da). On the other hand, molecules weighing between 300 and 500 Da are excreted through both urine and bile. Larger molecules above 500 Da tend to be excreted less...
Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Clot Retraction and Fibrinolysis01:16

Clot Retraction and Fibrinolysis

After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
Drug Distribution: Plasma Protein Binding01:29

Drug Distribution: Plasma Protein Binding

Drugs predominantly attach to plasma proteins, with only a small percentage remaining unbound. The unbound portion can be calculated as one minus the bound fraction. Acidic drugs form large, inactive complexes by reversibly binding to plasma albumin, which prevents them from diffusing across biological barriers. These drug-protein complexes act as reservoirs for the drugs. As the concentration of unbound drugs decreases, these complexes quickly dissociate to release the free drug, maintaining...