Melt Electrowriting of Graded Porous Scaffolds to Mimic the Matrix Structure of the Human Trabecular Meshwork.
Małgorzata Katarzyna Włodarczyk-BiegunMaria VilliouMarcus KochChristina MuthPeixi WangJenna OttAranzazu Del CampoPublished in: ACS biomaterials science & engineering (2022)
The permeability of the human trabecular meshwork (HTM) regulates eye pressure via a porosity gradient across its thickness modulated by stacked layers of matrix fibrils and cells. Changes in HTM porosity are associated with increases in intraocular pressure and the progress of diseases such as glaucoma. Engineered HTMs could help to understand the structure-function relation in natural tissues and lead to new regenerative solutions. Here, melt electrowriting (MEW) is explored as a biofabrication technique to produce fibrillar, porous scaffolds that mimic the multilayer, gradient structure of native HTM. Poly(caprolactone) constructs with a height of 125-500 μm and fiber diameters of 10-12 μm are printed. Scaffolds with a tensile modulus between 5.6 and 13 MPa and a static compression modulus in the range of 6-360 kPa are obtained by varying the scaffold design, that is, the density and orientation of the fibers and number of stacked layers. Primary HTM cells attach to the scaffolds, proliferate, and form a confluent layer within 8-14 days, depending on the scaffold design. High cell viability and cell morphology close to that in the native tissue are observed. The present work demonstrates the utility of MEW for reconstructing complex morphological features of natural tissues.
Keyphrases
- tissue engineering
- endothelial cells
- induced apoptosis
- cell cycle arrest
- gene expression
- body mass index
- bone mineral density
- pluripotent stem cells
- endoplasmic reticulum stress
- stem cells
- mesenchymal stem cells
- signaling pathway
- cell death
- optical coherence tomography
- bone marrow
- optic nerve
- solar cells
- cataract surgery