In VivoImaging of Local Inflammation: Monitoring LPS-Induced CD80/CD86 Upregulation by PET
| Autor: | Nicholas P. van der Meulen, Martin Béhé, Marco F. Taddio, Alain Blanc, Stefanie D. Krämer, Cornelia Halin, Roger Schibli, Zeynep Talip, Claudia Adrianna Castro Jaramillo, Peter Runge, Claudia Keller |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Male
Lipopolysaccharides Cancer Research Biodistribution Molecular imaging Inflammation chemical and pharmacologic phenomena Flow cytometry Abatacept Mice 03 medical and health sciences 0302 clinical medicine Immune system Downregulation and upregulation CD80 Positron Emission Tomography Computed Tomography medicine Animals Co-stimulatory molecules CD86 PET Tissue Distribution Radiology Nuclear Medicine and imaging Immune Checkpoint Inhibitors 030304 developmental biology 0303 health sciences medicine.diagnostic_test Chemistry hemic and immune systems Molecular biology Up-Regulation Mice Inbred C57BL Copper Radioisotopes Oncology Models Animal B7-1 Antigen B7-2 Antigen Radiopharmaceuticals medicine.symptom Ex vivo Research Article 030215 immunology |
| Zdroj: | Molecular Imaging and Biology, 23 Molecular Imaging and Biology |
| ISSN: | 1860-2002 1536-1632 |
| DOI: | 10.3929/ethz-b-000445389 |
| Popis: | Purpose The co-stimulatory molecules CD80 and CD86 are upregulated on activated antigen-presenting cells (APC). We investigated whether local APC activation, induced by subcutaneous (s.c.) inoculation of lipopolysaccharides (LPS), can be imaged by positron emission tomography (PET) with CD80/CD86-targeting 64Cu-labelled abatacept. Procedures Mice were inoculated s.c. with extracellular-matrix gel containing either LPS or vehicle (PBS). Immune cell populations were analysed by flow cytometry and marker expression by RT-qPCR. 64Cu-NODAGA-abatacept distribution was analysed using PET/CT and ex vivo biodistribution. Results The number of CD80+ and CD86+ immune cells at the LPS inoculation site significantly increased a few days after inoculation. CD68 and CD86 expression were higher at the LPS than the PBS inoculation site, and CD80 was only increased at the LPS inoculation site. CTLA-4 was highest 10 days after LPS inoculation, when CD80/CD86 decreased again. A few days after inoculation, 64Cu-NODAGA-abatacept distribution to the inoculation site was significantly higher for LPS than PBS (4.2-fold). Co-administration of unlabelled abatacept or human immunoglobulin reduced tracer uptake. The latter reduced the number of CD86+ immune cells at the LPS inoculation site. Conclusions CD80 and CD86 are upregulated in an LPS-induced local inflammation, indicating invasion of activated APCs. 64Cu-NODAGA-abatacept PET allowed following APC activation over time. Molecular Imaging and Biology, 23 ISSN:1860-2002 ISSN:1536-1632 |
| Databáze: | OpenAIRE |
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