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Related Concept Videos

Integrins01:10

Integrins

Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Activation of Integrins01:15

Activation of Integrins

Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
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...
Selectins01:25

Selectins

Cell adhesion is  an essential aspect of multicellularity. While stable cell interactions usually occur between cells of the same type, transient cell interactions occur between cells of different tissue types, such as between neutrophils and endothelial cells. Selectins are one class of cell adhesion molecules (CAMs) that bind carbohydrate ligands to form transient cell adhesion. They are rod-like proteins with a long extracellular part of variable length ending with the lectin domain, which...
Immunoglobulin-like Cell Adhesion Molecules01:31

Immunoglobulin-like Cell Adhesion Molecules

Immunoglobulin-like cell adhesion molecules or Ig-CAMs are a versatile group of cell surface glycoproteins belonging to the immunoglobulin protein superfamily. Ig-CAMs possess the characteristic immunoglobulin protein domains and other domains such as the fibronectin type III domain. The Ig domains are glycosylated to varying degrees in different Ig-CAMs.
Ig-CAMs exhibit either homophilic binding (to other Ig-CAMs) or heterophilic binding (to other ligands such as integrins). While most Ig-CAMs...
Glomerular Filtration01:15

Glomerular Filtration

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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Related Experiment Video

Updated: Jul 21, 2026

Isolation of Glomeruli and In Vivo Labeling of Glomerular Cell Surface Proteins
09:12

Isolation of Glomeruli and In Vivo Labeling of Glomerular Cell Surface Proteins

Published on: January 18, 2019

Integrin receptors and function on cultured glomerular endothelial cells

S Adler1, B Eng

  • 1Department of Medicine, New York Medical College, Valhalla.

Kidney International
|August 1, 1993
PubMed
Summary

This study looked at how cultured rat glomerular endothelial cells stick to parts of the basement membrane. The cells were tested for adhesion to fibronectin, laminin, and collagen types I and IV. The researchers found that these cells express several integrins, including alpha 1 beta 1, alpha 2 beta 1, alpha 3 beta 1, alpha 5 beta 1, alpha v beta 1, and alpha v beta 3. They used synthetic peptides and antibodies to determine which integrins are most important. Beta 1 integrin was crucial for adhesion to laminin and fibronectin. Alpha 3 beta 1 was the main receptor for type I collagen. Alpha 5 beta 1 was the primary fibronectin receptor. The study highlights the complex roles of different integrins in cell adhesion. These findings may help explain how glomerular endothelial cells interact with their environment.

Keywords:
Integrin function in endothelial cellsCell adhesion to extracellular matrixRenal basement membrane interactionsGlomerular endothelial cell biology

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Area of Science:

  • Cell adhesion mechanisms in renal physiology
  • Integrin signaling in vascular biology
  • Endothelial cell interactions with extracellular matrix

Background:

Researchers have long sought to understand how glomerular endothelial cells interact with the basement membrane. Prior studies have identified integrins as key players in cell adhesion. However, the specific roles of different integrin subtypes in glomerular endothelial cells remain unclear. Some research has shown integrins mediate adhesion to fibronectin and collagen. But no prior work had resolved the precise contributions of alpha and beta subunits in this context. This uncertainty drove the need for a more detailed investigation. The lack of clarity about integrin function in these cells limits understanding of renal filtration. No prior study had focused on cloned rat glomerular endothelial cells. This gap motivated the current analysis of integrin expression and function.

Purpose Of The Study:

The study aimed to investigate integrin expression and function in cultured rat glomerular endothelial cells. The researchers wanted to determine how these cells interact with basement membrane components. They focused on fibronectin, laminin, and collagen types I and IV. The goal was to identify which integrins mediate adhesion to each substrate. They tested the effects of synthetic peptides and antibodies on adhesion. The study sought to clarify the roles of alpha and beta integrin subunits. The researchers also wanted to assess the contribution of alpha v beta 1 and alpha v beta 3 integrins. This analysis aimed to provide insights into endothelial cell adhesion mechanisms.

Main Methods:

The researchers used a cloned line of rat glomerular endothelial cells for their experiments. They tested adhesion to fibronectin, laminin, and collagen types I and IV. They used synthetic RGDS peptides to assess fibronectin adhesion inhibition. Antibodies to beta 1 and alpha 1 integrin subunits were applied to test their roles. Affinity chromatography was performed on immobilized type I collagen. This method identified the major integrin binding to collagen. Chromatography on fibronectin cell-binding fragments was also conducted. This approach revealed the primary fibronectin receptor on these cells.

Main Results:

Cultured glomerular endothelial cells adhered to fibronectin, laminin, and collagen types I and IV. They expressed alpha 1 beta 1, alpha 2 beta 1, alpha 3 beta 1, alpha 5 beta 1, alpha v beta 1, and alpha v beta 3 integrins. RGDS peptides reduced fibronectin adhesion by 46.9% compared to control. Beta 1 integrin antibody inhibited adhesion to laminin by 88.8%. It also reduced adhesion to fibronectin by 81.0% and to type I collagen by 32.7%. Alpha 1 integrin antibody inhibited laminin adhesion by 34.8%. It had minimal effect on type IV collagen adhesion. Chromatography showed alpha 3 beta 1 as the main collagen receptor.

Conclusions:

The study suggests that multiple integrins mediate adhesion of glomerular endothelial cells to basement membrane components. Alpha 3 beta 1 appears to be the primary receptor for type I collagen. Alpha 5 beta 1 is the main fibronectin receptor on these cells. Beta 1 integrin plays a major role in adhesion to several substrates. Alpha v beta 3 may contribute to fibronectin adhesion but not significantly. The findings highlight the diversity of integrin function in these cells. They provide a framework for understanding endothelial cell adhesion. The results support the need for further studies on integrin interactions.

Alpha 3 beta 1 integrin is the primary receptor for type I collagen in these cells.

Alpha 5 beta 1 integrin is the main fibronectin receptor on glomerular endothelial cells.

Affinity chromatography identified the integrins that bind to specific substrates like collagen and fibronectin.

RGDS peptides reduced fibronectin adhesion to 53.1% of control levels in cultured glomerular endothelial cells.

Beta 1 integrin antibody reduced adhesion to type I collagen by 32.7% compared to control.

The study suggests a minor role for alpha v beta 3 integrin in fibronectin adhesion.