Engineering Breast Cancer Microenvironments and 3D Bioprinting

Area of Science:

• Biomedical Engineering
• Cancer Biology
• Extracellular Matrix Research

Background:

• The extracellular matrix (ECM) significantly influences tumor growth and metastasis.
• Traditional two-dimensional (2D) cell culture models inadequately represent the complex breast cancer microenvironment.
• Physiologically relevant three-dimensional (3D) models are essential for understanding cancer progression and treatment.

Purpose of the Study:

• To review the definition of cancer microenvironments, including stromal components and cell-ECM interactions.
• To summarize emerging technologies for creating biomimetic breast cancer microenvironments.
• To highlight biophysical differences in ECM between primary tumors and metastatic sites, focusing on cancer stem cells.

Main Methods:

• Review of current literature on breast cancer microenvironment components and engineering strategies.
• Categorization of technologies into biochemical factors and 3D bioprinting methods.
• Discussion of perfusable scaffolds, tumor stiffness, supporting cells, and complex patterning.

Main Results:

• 3D culture models offer superior recapitulation of native tumor architecture and cell interactions compared to 2D models.
• Biochemical factors (matrix proteins, soluble factors, biomaterials) and 3D bioprinting are crucial for engineering relevant microenvironments.
• Biophysical properties of the ECM, particularly in metastatic sites, modulate cancer stem cell behavior and patient prognosis.

Conclusions:

• Advanced 3D culture systems are necessary to accurately model breast cancer progression and metastasis.
• Engineering breast cancer microenvironments requires integrating biochemical and biophysical cues, including cell-ECM interactions.
• Further investigation into understudied ECM proteins may reveal novel therapeutic targets and improve patient outcome prediction.