Journal article
TLR4 stimulation by LPS enhances angiogenesis in a co-culture system consisting of primary human osteoblasts and outgrowth endothelial cells
Journal of Tissue Engineering and Regenerative Medicine, Vol.11(6), pp.1779-1791
2017
Abstract
The development of new approaches leading to fast and successful vascularization of tissue-engineered constructs is one of the most intensively studied subjects in tissue engineering and regenerative medicine. Recently, TLR4 activation and LPS stimulation of endothelial cells have been reported to promote angiogenesis in a variety of settings. In this study, we demonstrate that TLR4 activation by Ultrapure LPS Escherichia coli 0111:B4 (LPS-EB) significantly enhances microvessel formation in a co-culture system consisting of outgrowth endothelial cells (OECs) and primary human osteoblasts (pOBs). The precise modes of TLR4 action on the process of angiogenesis have also been investigated in this study. Using quantitative fluorescence microscopy in monocultures of OECs and pOBs, it was found that TLR4 activation through LPS-EB upregulates the expression level of TLR4/MYD88 and enhances both angiogenesis and osteogenesis. Furthermore, ELISA and qRT-PCR have shown that the level of two adhesion molecules (ICAM-1 and E-selectin), two cytokines (IL-6 and IL-8) and two growth factors (VEGF and PDGF-BB) related to angiogenesis increase significantly after LPS-EB treatment. This increased understanding of the role of TLR4 in angiogenesis could be of value in various settings related to tissue repair and tissue engineering. Moreover, since LPS and TLR4 agonists improve angiogenesis and osteogenesis, TLR4 agonists (endogenous or synthetic) could be used for angiogenesis intervention in vivo and therefore could be tested for their potential clinical applications in promoting angiogenesis in bone tissue engineering.
Details
- Title
- TLR4 stimulation by LPS enhances angiogenesis in a co-culture system consisting of primary human osteoblasts and outgrowth endothelial cells
- Authors/Creators
- B. Ma (Author/Creator) - Murdoch UniversityE. Dohle (Author/Creator) - University Medical Center of the Johannes Gutenberg University MainzM. Li (Author/Creator) - University Medical Center of the Johannes Gutenberg University MainzC.J. Kirkpatrick (Author/Creator) - University Medical Center of the Johannes Gutenberg University Mainz
- Publication Details
- Journal of Tissue Engineering and Regenerative Medicine, Vol.11(6), pp.1779-1791
- Publisher
- Wiley
- Identifiers
- 991005545416307891
- Copyright
- © 2015 John Wiley & Sons, Ltd.
- Murdoch Affiliation
- School of Veterinary and Life Sciences
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 1 Clinical & Life Sciences
- 1.6 Immunology
- 1.6.609 Toll-like Receptors
- Web Of Science research areas
- Biotechnology & Applied Microbiology
- Cell & Tissue Engineering
- Cell Biology
- Engineering, Biomedical
- ESI research areas
- Molecular Biology & Genetics