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Published on: July 2, 2018
3D in vitro bioengineered tumors based on collagen I hydrogels
Christopher S Szot1, Cara F Buchanan, Joseph W Freeman
1School of Biomedical Engineering and Sciences, Virginia Tech-Wake Forest University, Blacksburg, VA 24061, USA. szotc@vt.edu
Biomaterials
|July 26, 2011
Summary
This study bioengineered 3D collagen I hydrogels with breast cancer cells to create an in vitro tumor model. The model mimics in vivo conditions, showing hypoxia-inducible factor (HIF)-1α expression and angiogenic potential.
Area of Science:
- Biomaterials Science
- Cancer Biology
- Tissue Engineering
Background:
- Three-dimensional (3D) in vitro cell culture models offer enhanced physiological relevance compared to traditional 2D cultures.
- 3D models are crucial for studying complex biological processes like tumor development and response to stimuli.
- Collagen I hydrogels provide a biocompatible scaffold that supports cell-matrix and cell-cell interactions.
Purpose of the Study:
- To bioengineer a physiologically relevant in vitro solid tumor model using collagen I hydrogels and MDA-MB-231 human breast cancer cells.
- To investigate the development of hypoxia and angiogenic potential within the 3D tumor model.
- To compare gene expression profiles of cancer cells in 3D hydrogels versus 2D cultures.
Main Methods:
- Culture of MDA-MB-231 human breast cancer cells within collagen I hydrogels to create 3D tumor constructs.
- Assessment of cell-cell and cell-matrix interactions within the 3D architecture.
- Quantification of hypoxia-inducible factor (HIF)-1α and vascular endothelial growth factor (VEGF)-A gene expression using quantitative PCR.
- Analysis of necrosis development and diffusion limitations within the hydrogel.
Main Results:
- The 3D collagen I hydrogels supported unconfined cellular proliferation and mimicked in vivo tissue progression.
- Necrosis was observed beyond ~150-200 microm, correlating with increased HIF-1α gene expression (p < 0.01) due to hypoxia.
- Significant upregulation of VEGF-A gene expression (p < 0.001) indicated angiogenic potential.
- MDA-MB-231 cells in 3D hydrogels showed significantly higher HIF-1α (p < 0.05) and VEGF-A (p < 0.001) expression compared to 2D cultures.
Conclusions:
- Collagen I hydrogels effectively facilitate the development of 3D in vitro bioengineered tumors.
- The developed model recapitulates key features of pre-vascularized in vivo solid tumors, including hypoxia and angiogenic signaling.
- This 3D model serves as a valuable platform for studying tumor biology and developing new cancer therapies.
