We study and orchestrate how synthetic materials interact with living cells. We engineer cell-instructive environments and material-based solutions for zero-waste therapeutic solutions
Our group develops hydrogel materials with programmed and tunable properties designed to encapsulate and instruct living cells. We study how living cells and inert matter interact and how these interactions can be exploited to direct cellular functions and ultimately result in therapeutic advantages. We cooperate with synthetic biologists, biophysicists, drug developers and clinicians to explore the application potential of our developments, with a focus on new materials for ophthalmic drug delivery. We contribute to INM’s competence fields opto-interactive and bio-intelligent materials. Our research addresses biomedical needs.
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Team Members
Research
Hydrogels with latent properties
By integrating phototriggers and light-responsive molecular motors in polymeric networks, we develop 4D hydrogels with optoregulated (bio)chemical activity, crosslinking, degradation, or mechanoactuation. These are used for biophysical studies of cell response to changes in the biochemical and mechanical signals of the extracellular environment.
Model Cellular Microenvironments
We build synthetic models of cell-matrix and cell-cell interfaces with encoded biochemical, mechanical and dimensional signals. To accelerate discovery, we develop material microarrays for high-throughput biophysical experimentation and apply them to study multifactorial cell responses.
Living Therapeutic Devices
We develop bioinks and apply biofabrication technologies for functional and safe encapsulation of cells in medical devices. We focus on self-replenishable living therapeutic materials which integrate drug biofactories and have unlimited therapeutic release. We aim for innovation in ocular therapeutics with living, self-replenishable drug-eluting contact lenses.
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Selected Publications
Kiefer, Karin | Akp | Haidar, Ayman | Ikier, Tuba | Akkan, Ca | Akman, Erhan | Lee, Juseok | Martinez Miró, Marina | Kaçar, Elif | Demir, Arif | Veith, Michael | Ural, Dilek | Kasap, Murat | Kesmez, Mehmet | Abdul-Khaliq, Hashim | Aktas, Oral C.
DOI:
In-stent restenosis (ISR) is one of the most common and serious complications observed after stent implantation. ISR is characterized by the inordinate proliferation of smooth muscle cells (SMC) that leads to narrowing of the blood vessels. To achieve a healthy endothelium, it is critical to selectively enhance the growth of endothelial cells (EC) while suppressing the growth of smooth muscle cells, which is still a major challenge and yet to be achieved. In this study, novel surfaces have been developed to support the selective growth of endothelial cells. Micro- and nanostructured Al2O3 surfaces with unique topographical features were fabricated and tested. Surface characterization and cellular response of endothelial cells (HUVEC) as well as smooth muscle cells (HUVSMC) has been investigated at cellular and molecular levels. A topography driven selective cell response of ECs over SMCs was demonstrated successfully. This selective response of ECs was also analyzed at protein levels in order to understand the basic mechanism.
Paez, Julieta I. | Ustahüseyin, Oya | Serrano, Cristina | Ton, Xuan-Anh | Shafiq, Zahid | Auernhammer, Günter K. | d’Ischia, Marco | del Campo, Aránzazu
DOI:
The curing time of an adhesive material is determined by the polymerization and cross-linking kinetics of the adhesive formulation and needs to be optimized for the particular application. Here, we explore the possibility of tuning the polymerization kinetics and final mechanical properties of tissue-adhesive PEG gels formed by polymerization of end-functionalized star-PEGs with catecholamines with varying substituents. We show strong differences in cross-linking time and cohesiveness of the final gels among the catecholamine-PEG variants. Installation of an electron-withdrawing but π-electron donating chloro substituent on the catechol ring resulted in faster and more efficient cross-linking, while opposite effects were observed with the strongly electron-withdrawing nitro group. Chain substitution slowed down the kinetics and hindered cross-linking due either to chain breakdown (beta-OH group, in norepinephrine) or intramolecular cyclization (α-carboxyl group, in DOPA). Interesting perspectives derive from use of mixtures of catecholamine-PEG precursors offering further opportunities for fine-tuning of the curing parameters. These are interesting properties for the application of catecholamine-PEG gels as tissue glues or biomaterials for cell encapsulation.