Related Experiment Video

Updated: Jan 2, 2026

Ex Vivo Corneal Organ Culture Model for Wound Healing Studies
06:46

Ex Vivo Corneal Organ Culture Model for Wound Healing Studies

Published on: February 15, 2019

12.4K

Biology of corneal fibrosis: soluble mediators, integrins, and extracellular vesicles

Tina B McKay1, Audrey E K Hutcheon2, James D Zieske2

  • 1Schepens Eye Research Institute/Massachusetts Eye and Ear, Department of Ophthalmology, Harvard Medical School, Boston, MA, 02114, USA. Tina_McKay@meei.harvard.edu.

Eye (London, England)
|December 14, 2019
PubMed

Insights

Corneal fibrosis, or scarring, involves complex biochemical pathways and extracellular matrix deposition. This study explores key pro-fibrotic factors and highlights a novel role for epithelial-derived extracellular vesicles in corneal wound healing.

Area of Science:

  • Ophthalmology
  • Cell Biology
  • Biochemistry

Background:

  • Corneal fibrosis disrupts tissue homeostasis, leading to irregular extracellular matrix deposition.
  • Scarring mechanisms are primarily linked to the transforming growth factor-β pathway and myofibroblast differentiation.

Purpose of the Study:

  • To elucidate the biochemical pathways regulating corneal fibrosis.
  • To examine the roles of specific pro-fibrotic factors in corneal scarring.
  • To investigate the contribution of epithelial-derived extracellular vesicles and the basement membrane.

Main Methods:

  • Analysis of biochemical pathways in epithelial debridement, superficial keratectomy, and penetrating incision injury models.
  • Elaboration on the interplay of transforming growth factor-β1, thrombospondin-1, and αvβ6 integrins.
  • Exploration of extracellular vesicle function and basement membrane importance.

Main Results:

  • Detailed discussion of canonical transforming growth factor-β pathway involvement.
  • Identification of key pro-fibrotic factors contributing to corneal scar development.
  • Novel insights into the role of extracellular vesicles in epithelial wound healing.

Conclusions:

  • Corneal fibrosis is a multifactorial process involving specific biochemical pathways and cellular interactions.
  • Transforming growth factor-β1, thrombospondin-1, and αvβ6 are critical in scar formation.
  • Extracellular vesicles and basement membrane integrity are important, underappreciated factors in corneal repair.

More Related Videos

In Vitro and In Vivo Models to Study Corneal Endothelial-mesenchymal Transition09:05

In Vitro and In Vivo Models to Study Corneal Endothelial-mesenchymal Transition

Published on: August 20, 2016

8.3K
Establishing a Severe Corneal Inflammation Model in Rats Based on Corneal Epithelium Curettage Combined with Corneal Sutures04:48

Establishing a Severe Corneal Inflammation Model in Rats Based on Corneal Epithelium Curettage Combined with Corneal Sutures

Published on: November 22, 2024

693

Related Concept Videos

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...
3.4K
Introduction to Fibroblasts01:09

Introduction to Fibroblasts

Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
3.7K
Fibronectins Connect Cells with ECM01:25

Fibronectins Connect Cells with ECM

Fibronectin is an adhesive glycoprotein present in the extracellular matrix of embryogenic and adult tissue. These molecules primarily aid in regulating cell motility and attachment. A fibronectin molecule is composed of two identical polypeptide chains attached to each other by a pair of disulfide bonds at the C-terminal.
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
3.2K
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...
4.8K
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,...
5.1K
Fibril-associated Collagen01:11

Fibril-associated Collagen

Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
3.2K