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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.
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Fabrication and Characterization of Layer-By-Layer Janus Base Nano-Matrix to Promote Cartilage Regeneration

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Interactions between integrin ligand density and cytoskeletal integrity regulate BMSC chondrogenesis.

John T Connelly¹, Andrés J García, Marc E Levenston

¹George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA.

Journal of Cellular Physiology

|May 3, 2008

Summary

Integrin-mediated adhesion to RGD-modified hydrogels inhibits bone marrow stromal cell (BMSC) chondrogenesis by affecting the actin cytoskeleton. This effect is lineage-specific and depends on the microenvironment, impacting glycosaminoglycan production and gene expression.

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Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation

Dendrimer-based Uneven Nanopatterns to Locally Control Surface Adhesiveness: A Method to Direct Chondrogenic Differentiation

Published on: January 20, 2018

Area of Science:

Biomaterials Science
Cell Biology
Tissue Engineering

Background:

Extracellular matrix interactions regulate chondrocyte phenotype.
Integrin-mediated adhesion's role in mesenchymal progenitor chondrogenesis is unclear.

Purpose of the Study:

Investigate integrin-mediated adhesion effects on chondrogenesis.
Examine cytoskeletal organization's role in 3D culture.
Utilize RGD-modified agarose hydrogels for bone marrow stromal cells (BMSCs).

Main Methods:

Modified agarose hydrogels with arginine-glycine-aspartic acid (RGD) peptides.
Cultured BMSCs in 3D, assessing spreading, integrin involvement (alphavbeta3), and cytoskeletal organization.
Evaluated chondrogenesis markers (sGAG, aggrecanase) with TGF-beta1 and dexamethasone.
Assessed gene expression (osteocalcin, collagen I) and alkaline phosphatase activity.

Main Results:

RGD interactions promoted BMSC spreading via alphavbeta3 integrins.
Adhesion to RGD inhibited TGF-beta1/dexamethasone-stimulated sGAG production, dependent on RGD density and F-actin cytoskeleton.
RGD interactions enhanced osteocalcin and collagen I expression and alkaline phosphatase activity in serum-supplemented medium.
RGD-modified gels promoted cell migration and sGAG release.

Conclusions:

Integrin-mediated adhesion inhibits BMSC chondrogenesis through actin cytoskeleton interactions in 3D.
The impact of RGD adhesion on mesenchymal differentiation is lineage-specific.
Cellular microenvironment composition critically influences RGD-adhesion effects on differentiation.