In Situ Elasticity Modulation with Dynamic Substrates to Direct Cell

In Situ Elasticity Modulation with Dynamic Substrates to Direct Cell


The research on cell fabrication that has been carried out using different moduli indicates that elasticity of the substrate affects the cell contractile forces and other cell functions including differentiation and cytoskeletal organization. For example, when one is injured, the fibroblasts differentiate into myofibroblasts, which is a phenotype that helps in repairing and replacing the damaged ECM (extra cellular matrix) in the tissues and organs that are injured. The secretion of ECM leads to an increase of the elastic moduli that are found in the cell microenvironment. Upon the achievement of the desired matrix modulus, myofibroblasts deactivates. Failure of the myofibroblasts to deactivate may affect fibrosis. The matrix moduli in dynamic cellular helps in the treatment of fibrotic diseases and in the regeneration of tissue. Experiments have been done in situ to understand how substrate modulus changes affect fibroblast-myofibroblast differentiation.

Materials and Method

Some of the materials and methods necessary to understand how the cells respond to the dynamic microenvironmental changes in substrate modulus and how they influence fibroblast-myofibroblast differentiation include the hydrogel preparation. Photodegradable crosslinker is copolymerized with PEGA in PBS through radicalization of polymerization redox initiative. This process completes in five minutes depending on the modulus evolution. Other materials required include the cell culture, cell tracking on real time basis, immunostaining and gene expression as well as recording of the statistics.



In the synthesis of the photogradable hydrogels where their mechanical properties were subjected to irradiation, the VIC activation to the myofibroblasts is linked to the fibrotic valve disease. Fibroblast – Myofibroblast change is important in the healing process of many wounds as it examines the effect of in situ substrate modules variation on the VIC culture and the myofibroblastic activation. Hydrogel films are synthesized through the copolymerization of photodegradable PEG diacrylatecrosslinking macromer with PEGA put in phosphate buffered saline. Degrading the hydrogels in bulk under cytocompatible irradiation condition is characterized with rheometry. The degradation is arrested when irradiation is ceased. The myofibroblast phenotype when unregulated demonstrates the special wound healing functions like the production of ECM. The substrates formed by the hydrogel photodegradation encourage cell migration and is important in the exploration of cellular processes. VIC differentiation into myofibroblasts for SMA is a key indicator of how myofibroblasts relates to the substrate elasticity that occurs at the collagenous bone, which promotes the differentiation of the VICs into myofibroblasts. The modulation of the substrates in situ directs the myofibroblast deactivation, which can help understand the dynamic cellular processes on the cell function.


In understanding how substrate modulus changes alter fibroblast-myofibroblast differentiation, photodegradable hydrogel films were subjected to cytocompatible irradiation situations to generate substrates from a single hydrogel mixture. These gradient substrates were used in order to screen the effect microenvironment elasticity on the cell differentiation without influencing the cell migration. The identification of high and low moduli helped in the promotion or suppression of VIC myofibroblastic. The test also sort to identify the effect of dynamic variations in the elasticity of VIC through irradiating specimens with the activated cells and decreasing the modules while at the same time inducing the cell deactivation. A new level on the control of substrate mudules is in place and may help in further exploration of mechanotransduction changes during cell differentiation and migration to understand their effects on disease and tissue regeneration.