Microstructural densification and alignment by aspiration-ejection influence cancer cell interactions with...

Area of Science:

• Biomaterials Science
• Cancer Biology
• Biophysics

Background:

• Extracellular matrix (ECM) mechanics and microstructure significantly impact breast cancer progression and invasion.
• Existing in vitro models often fail to replicate the dense, aligned peritumor collagen network found in vivo.

Purpose of the Study:

• To investigate the effects of physically manipulating collagen hydrogels on breast cancer cell behavior and the surrounding matrix.
• To establish a biomimetic 3D matrix microenvironment for studying cancer cell mechanics and drug screening.

Main Methods:

• Breast cancer cell lines (MDA-MB-231, MCF-7) were cultured in collagen hydrogels subjected to aspiration-ejection.
• Characterization included videomicroscopy, epifluorescence microscopy (F-actin), histological sections, and metabolic byproduct analysis.
• Evaluated cell morphology, collagen network microstructure, and proliferation at various time points post-aspiration.

Main Results:

• Aspiration-ejection created a denser, aligned collagen network, inducing immediate cell co-orientation and higher cell density.
• Breast cancer cells remained viable, with slightly reduced proliferation compared to controls.
• MDA-MB-231 cells showed partial relaxation of the collagen network and loss of alignment over time.

Conclusions:

• Physical manipulation of collagen gels provides a biomimetic platform to study cancer cell-matrix interactions.
• The platform has translational potential for anticancer drug screening and preclinical model development.
• Cell-matrix interactions and network remodeling dynamically influence cancer cell organization and ECM microstructure.