Extracellular Matrix Profiling and Disease Modelling in Engineered Vascular Smooth Muscle Cell Tissues

Area of Science:

• Vascular Biology
• Biomaterials Science
• Tissue Engineering

Background:

• Vascular smooth muscle cells (SMCs) are crucial for vessel homeostasis and disease.
• Traditional 2D cell cultures lack the physiological extracellular matrix (ECM) environment.
• A more biomimetic model is needed to study SMC-ECM interactions.

Purpose of the Study:

• To establish and characterize a 3D engineered vascular smooth muscle cell tissue (EVT) model.
• To investigate SMC-derived ECM synthesis, deposition, and turnover in a 3D context.
• To compare the utility of EVTs versus 2D cultures in modeling vascular pathologies like calcification.

Main Methods:

• Primary murine aortic SMCs were cultured in a 3D fibrin gel between flexible posts to form EVTs.
• Immunohistochemistry and mass spectrometry-based proteomics were used to analyze EVT composition and ECM.
• EVTs and 2D SMC cultures were subjected to TGFβ-1 stimulation and calcification assays.

Main Results:

• EVTs supported aligned, viable, and secretory SMCs with progressive ECM deposition, including versican and collagens.
• EVTs exhibited TGFβ-1-induced contraction and altered ECM, while SB 431542 inhibited ECM secretion.
• EVTs showed reduced and more discriminative calcification compared to 2D cultures, retaining matrix Gla protein expression.

Conclusions:

• Engineered vascular tissues (EVTs) provide an intuitive and versatile 3D model for studying SMCs and their ECM.
• EVTs offer a more physiologically relevant platform than 2D cultures for investigating ECM dynamics and vascular disease mechanisms.
• This 3D model facilitates the study of ECM retention and turnover, crucial for understanding vascular health and disease.