التفاصيل البيبلوغرافية
| العنوان: |
In Vivo Imaging of Local Inflammation: Monitoring LPS-Induced CD80/CD86 Upregulation by PET. |
| المؤلفون: |
Taddio, Marco F., Castro Jaramillo, Claudia A., Runge, Peter, Blanc, Alain, Keller, Claudia, Talip, Zeynep, Béhé, Martin, van der Meulen, Nicholas P., Halin, Cornelia, Schibli, Roger, Krämer, Stefanie D. |
| المصدر: |
Molecular Imaging & Biology; Apr2021, Vol. 23 Issue 2, p196-207, 12p |
| مصطلحات موضوعية: |
TRANSLOCATOR proteins, POSITRON emission tomography, INFLAMMATION, CELL populations |
| مستخلص: |
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. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |