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Ultrathin Porated Elastic Hydrogels As a Biomimetic Basement Membrane for Dual Cell Culture
Published on: December 26, 2017
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Engineered basement membrane mimetic hydrogels to study mammary epithelial morphogenesis and invasion
Jane A Baude1, Megan D Li1, Sabrina M Jackson1
1University of California, Santa Barbara, Department of Molecular, Cellular, and Developmental Biology.
Biorxiv : the Preprint Server for Biology
|March 17, 2025
Summary
Engineered a tunable 3D basement membrane (eBM) matrix using alginate hydrogels and ECM peptides. This xenogenic-free system supports epithelial tissue modeling and reveals how matrix mechanics and peptide cues regulate cell behavior and disease phenotypes.
Area of Science:
- Biomaterials Science
- Cell Biology
- Tissue Engineering
Background:
- Reconstituted basement membrane (rBM) is crucial for 3D cell culture but has limitations like batch variability and xenogenic contaminants.
- Existing rBM lacks tunable mechanical properties, hindering precise control over cellular microenvironments.
Purpose of the Study:
- To engineer a tunable, xenogenic-free 3D basement membrane (eBM) matrix.
- To investigate how mechanical properties (stiffness, stress relaxation) and biochemical cues (ECM peptides) influence epithelial morphogenesis and tumorigenesis.
Main Methods:
- Conjugated defined extracellular matrix (ECM) adhesion peptides (IKVAV, YIGSR, RGD) to an alginate hydrogel.
- Precisely tuned hydrogel stiffness and viscoelasticity.
- Cultured MCF10A cells in engineered basement membranes (eBMs) to assess acinar morphogenesis and invasion.
Main Results:
- Soft, fast-relaxing IKVAV-modified eBMs best promoted polarized mammary acinar structures.
- Malignant phenotypes (invasion, loss of polarity) emerged in IKVAV-eBMs with tumor-like stiffness and slow stress relaxation.
- RGD-modified matrices induced malignant phenotypes irrespective of mechanical properties.
- Investigated downstream signaling, including integrin activity, hemidesmosome formation, and focal adhesion kinase/hemidesmosome signaling.
Conclusions:
- Engineered eBMs provide a tunable, xenogenic-free platform for studying cell-matrix interactions.
- Matrix stiffness and stress relaxation, alongside peptide cues, critically regulate epithelial morphogenesis and tumorigenesis.
- This system offers a robust model for fundamental research and translational applications in tissue engineering and disease modeling.
