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  3. Untangling the response of bone tumor cells and bone forming cells to matrix stiffness and adhesion ligand density by means of hydrogels

Untangling the response of bone tumor cells and bone forming cells to matrix stiffness and adhesion ligand density by means of hydrogels

  • Biomaterials. 2019 Jan;188:130-143. doi: 10.1016/j.biomaterials.2018.10.015.
Tongmeng Jiang 1,  Jinmin Zhao 1,  Shan Yu 2,  Zhengwei Mao 3,  Changyou Gao 2,  Ye Zhu 4,  Chuanbin Mao 5,  Li Zheng 6
Affiliations

Affiliations

  • 1 Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration & Guangxi Collaborative Innovation Center for Biomedicine, Life Sciences Institute, Guangxi Medical University, Nanning, 530021, China; Department of Orthopaedics Trauma and Hand Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China; Guangxi Key Laboratory of Regenerative Medicine, International Joint Laboratory on Regeneration of Bone and Soft Tissue, The First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, China.
  • 2 MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, 38# Zheda Road, Hangzhou, 310027, China.
  • 3 MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, 38# Zheda Road, Hangzhou, 310027, China. Electronic address: zwmao@zju.edu.cn.
  • 4 Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, Institute for Biomedical Engineering, Sience and Technology, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019-5300, USA.
  • 5 Department of Chemistry & Biochemistry, Stephenson Life Sciences Research Center, Institute for Biomedical Engineering, Sience and Technology, University of Oklahoma, 101 Stephenson Parkway, Norman, OK 73019-5300, USA; School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China. Electronic address: cbmao@ou.edu.
  • 6 Guangxi Engineering Center in Biomedical Materials for Tissue and Organ Regeneration & Guangxi Collaborative Innovation Center for Biomedicine, Life Sciences Institute, Guangxi Medical University, Nanning, 530021, China. Electronic address: zhengli224@163.com.
PMID: 30343256 DOI: 10.1016/j.biomaterials.2018.10.015
Abstract

How Cancer cells and their anchorage-dependent normal counterparts respond to the adhesion ligand density and stiffness of the same extracellular matrix (ECM) is still not very clear. Here we investigated the effects of ECM adhesion ligand density and stiffness on bone tumor cells (osteosarcoma cells) and bone forming cells (osteoblasts) by using poly (ethylene glycol) diacrylate (PEGDA) and methacrylated gelatin (GelMA) hydrogels. By independently changing the PEGDA and GelMA content in the hydrogels, we achieved crosslinked hydrogel matrix with independently tunable stiffness (1.6, 6 and 25 kPa for 5%, 10%, 15% PEDGA, respectively) and adhesion ligand density (low, medium and high for 0.05%, 0.2%, 0.5% GelMA respectively). By using a series of biochemical and cell biological characterizations as well as in vivo studies, we confirmed that osteosarcoma and osteoblastic cells responded differently to the stiffness and adhesion ligand density within 3D ECM. When cultured within the 3D PEGDA/GelMA hydrogel matrix, osteosarcoma cells are highly dependent on the matrix stiffness via regulating the integrin-mediated focal adhesion (FA) pathway, whereas osteoblasts are highly sensitive to the matrix adhesion ligand density through regulating the integrin-mediated adherens junction (AJ) pathway. However, when seeded on the 2D surface of the hydrogels, osteosarcoma cells behaved differently and became sensitive to the matrix adhesion ligand density because they were "forced" to attach to the substrate, similar to anchorage-dependent osteoblasts. This study might provide new insights into rational design of scaffolds for generating in vitro tumor models to test Anticancer therapeutics and for regenerating tissue to repair defects.

Keywords

Adhesion; Extracellular matrix; Osteoblasts; Osteosarcoma; Stiffness.

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