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Mitigation of Blood Borne Cell Attachment to Metal Implants through CD47-Derived Peptide Immobilization
Published on: December 3, 2020
Intracellular signaling mechanisms associated with CD47 modified surfaces
Matthew J Finley1, Katherine A Clark, Ivan S Alferiev
1Division of Cardiology, Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.
Biomaterials
|August 17, 2013
Summary
Recombinant CD47 protein on polyvinyl chloride (PVC) surfaces reduces inflammatory responses. CD47-PVC modifies gene transcription, protein levels, and activates the JAK-STAT pathway, offering a new strategy for biomaterials.
Area of Science:
- Biomaterials Science
- Immunology
- Molecular Biology
Background:
- Recombinant CD47 protein can reduce inflammatory responses to synthetic polymeric surfaces.
- Understanding the molecular mechanisms of CD47's anti-inflammatory effects on biomaterials is crucial.
Purpose of the Study:
- To profile the inflammatory cell response to CD47-modified polyvinyl chloride (CD47-PVC) at transcriptional, translational, and cell signaling levels.
- To elucidate the molecular mechanisms underlying CD47's amelioration of inflammatory responses.
Main Methods:
- Quantitative PCR (qPCR) arrays to compare gene transcription in human whole blood exposed to CD47-PVC versus PVC.
- Analysis of chemokine levels in plasma.
- Phosflow cytometry and assays for transcription factor binding, cell attachment, and genome-wide chromatin association.
Main Results:
- CD47-PVC downregulated specific inflammatory genes (e.g., IL1F5, CCL3) compared to PVC.
- CD47-PVC upregulated matrix metalloproteinase (MMP) genes (e.g., MMP1, MMP16).
- The JAK-STAT signaling pathway, particularly JAK2 and STAT5, was identified as mediating inflammatory cell interactions with CD47-PVC.
Conclusions:
- CD47 modification of PVC surfaces alters inflammatory cell responses at multiple molecular levels.
- Differential gene expression, including cytokine downregulation and MMP upregulation, characterizes the CD47-PVC interaction.
- JAK-STAT signaling is a key pathway involved in the anti-inflammatory effects of CD47 on biomaterials.
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