Lipid Deposition Profiles Influence Foreign Body Responses
Abstract
Fibrosis remains a significant cause of failure in implanted biomedical devices and early absorption of proteins on implant surfaces has been shown to be a key instigating factor. However, lipids can also regulate immune activity and their presence may also contribute to biomaterial‐induced foreign body responses (FBR) and fibrosis. Here it is demonstrated that the surface presentation of lipids on implant affects FBR by influencing reactions of immune cells to materials as well as their resultant inflammatory/suppressive polarization. Time‐of‐flight secondary ion mass spectroscopy (ToF‐SIMS) is employed to characterize lipid deposition on implants that are surface‐modified chemically with immunomodulatory small molecules. Multiple immunosuppressive phospholipids (phosphatidylcholine, phosphatidylinositol, phosphatidylethanolamine, and sphingomyelin) are all found to deposit preferentially on implants with anti‐FBR surface modifications in mice. Significantly, a set of 11 fatty acids is enriched on unmodified implanted devices that failed in both mice and humans, highlighting relevance across species. Phospholipid deposition is also found to upregulate the transcription of anti‐inflammatory genes in murine macrophages, while fatty acid deposition stimulated the expression of pro‐inflammatory genes. These results provide further insights into how to improve the design of biomaterials and medical devices to mitigate biomaterial material‐induced FBR and fibrosis.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 31, 2023
- Source ID
- 10.1002/adma.202205709
Entities
People
- Brian W. Hanak
- Christian C. Schreib
- Esperanza Vazquez
- Isaac B Hilton
- Jacob Goell
- Jared Lee
- Kevin N. Martins
- Leonardo D. Sanchez Solis
- Maria I. Jarvis
- Matthias A. Oberli
- Michael Beauregard
- Michael D. Doerfert
- Michael Diehl
- Omid Veiseh
- Sudip Mukherjee
- Tanguy Terlier
- Taylor Anne Wilson
Organizations
- Defense Advanced Research Projects Agency
- Rice University
- University of Houston