Bone-Derived dECM Hydrogels Support Tunable Microenvironments for In Vitro Osteogenic Differentiation.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Extracellular Matrix Biology

Background:

• Decellularized extracellular matrix (dECM) biomaterials are crucial for mimicking native environments and supporting 3D cell cultures.
• Developing tissue-specific dECM with tunable properties is essential for advanced in vitro models.

Purpose of the Study:

• To create a photocrosslinkable, bone-derived dECM hydrogel (dECM-MA) with adjustable mechanical characteristics.
• To evaluate the dECM-MA hydrogel's suitability for 3D culture of primary human osteoblasts (hOBs).

Main Methods:

• Trabecular bone was decellularized using EDTA and osmotic shock, preserving ECM proteins.
• dECM was solubilized, methacryloylated, and photocrosslinked into hydrogels with tunable Young's moduli (0.5-120 kPa).
• Primary human osteoblasts were encapsulated and cultured within dECM-MA hydrogels of varying stiffness (5, 10, 20 kPa).

Main Results:

• Decellularization reduced DNA by 94% while retaining 76 key matrisome proteins.
• Methacryloylation achieved 87-98% functionalization, enabling tunable hydrogel properties.
• Encapsulated hOBs remained viable, exhibited osteogenic morphology, increased metabolic activity, and showed signs of maturation and ECM remodeling in 10 kPa hydrogels.

Conclusions:

• Bone-derived dECM can be processed into tunable, photocrosslinkable hydrogels (dECM-MA).
• dECM-MA supports osteoblast viability, function, and maturation in a 3D environment.
• This dECM-MA platform is a promising tool for bone tissue engineering, disease modeling, and drug screening.