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Deshayes S, Baugé C, Dupont PA, Simard C, Rida H, de Boysson H, Manrique A, Aouba A. [ 18F]FDG PET-MR characterization of aortitis in the IL1rn -/- mouse model of giant-cell arteritis. EJNMMI Res 2023; 13:103. [PMID: 38019303 PMCID: PMC10687326 DOI: 10.1186/s13550-023-01039-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Accepted: 10/01/2023] [Indexed: 11/30/2023] Open
Abstract
BACKGROUND Metabolic imaging is routinely used to demonstrate aortitis in patients with giant-cell arteritis. We aimed to investigate the preclinical model of aortitis in BALB/c IL1rn-/- mice using [18F]fluorodeoxyglucose ([18F]FDG) positron emission tomography-magnetic resonance (PET-MR), gamma counting and immunostaining. We used 15 first-generation specific and opportunistic pathogen-free (SOPF) 9-week-old IL1rn-/- mice, 15 wild-type BALB/cAnN mice and 5 s-generation specific pathogen-free (SPF) 9-week-old IL1rn-/-. Aortic [18F]FDG uptake was assessed as the target-to-background ratio (TBR) using time-of-flight MR angiography as vascular landmarks. RESULTS [18F]FDG uptake measured by PET or gamma counting was similar in the first-generation SOPF IL1rn-/- mice and the wild-type group (p > 0.05). However, the first-generation IL1rn-/- mice exhibited more interleukin-1β (p = 0.021)- and interleukin-6 (p = 0.019)-positive cells within the abdominal aorta than the wild-type mice. In addition, the second-generation SPF group exhibited significantly higher TBR (p = 0.0068) than the wild-type mice on the descending thoracic aorta, unlike the first-generation SOPF IL1rn-/- mice. CONCLUSIONS In addition to the involvement of interleukin-1β and -6 in IL1rn-/- mouse aortitis, this study seems to validate [18F]FDG PET-MR as a useful tool for noninvasive monitoring of aortitis in this preclinical model.
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Affiliation(s)
- Samuel Deshayes
- Department of Internal Medicine and Clinical Immunology, Normandie University, UNICAEN, CHU de Caen Normandie - Université Basse Normandie, Avenue de la Côte de Nacre, 14000, CAEN, France.
- Normandie University, UNICAEN, CHU de Caen Normandie, UR4650 PSIR, Caen, France.
| | - Caroline Baugé
- Normandie University, UNICAEN, CHU de Caen Normandie, UR4650 PSIR, Caen, France
| | | | - Christophe Simard
- Normandie University, UNICAEN, CHU de Caen Normandie, UR4650 PSIR, Caen, France
| | - Hanan Rida
- Normandie University, UNICAEN, CHU de Caen Normandie, UR4650 PSIR, Caen, France
| | - Hubert de Boysson
- Department of Internal Medicine and Clinical Immunology, Normandie University, UNICAEN, CHU de Caen Normandie - Université Basse Normandie, Avenue de la Côte de Nacre, 14000, CAEN, France
- Normandie University, UNICAEN, CHU de Caen Normandie, UR4650 PSIR, Caen, France
| | - Alain Manrique
- Normandie University, UNICAEN, CHU de Caen Normandie, UR4650 PSIR, Caen, France
- Department of Nuclear Medicine, Normandie University, UNICAEN, CHU de Caen Normandie, Caen, France
| | - Achille Aouba
- Department of Internal Medicine and Clinical Immunology, Normandie University, UNICAEN, CHU de Caen Normandie - Université Basse Normandie, Avenue de la Côte de Nacre, 14000, CAEN, France.
- Normandie University, UNICAEN, CHU de Caen Normandie, UR4650 PSIR, Caen, France.
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