Assessing organ-level immunoreactivity in a rat model of sepsis using TSPO PET imaging.

Assessing organ-level immunoreactivity in a rat model of sepsis using TSPO PET imaging.
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DOI:
10.3389/fimmu.2022.1010263
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发表时间:
2022
影响因子:
7.3
通讯作者:
Hammoud, Dima A.
Hammoud, Dima A.
中科院分区:
医学2区
文献类型:
--
作者:
Martinez-Orengo, Neysha;Tahmazian, Sarine;Lai, Jianhao;Wang, Zeping;Sinharay, Sanhita;Schreiber-Stainthorp, William;Basuli, Falguni;Maric, Dragan;Reid, William;Shah, Swati;Hammoud, Dima A.

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There is current need for new approaches to assess/measure organ-level immunoreactivity and ensuing dysfunction in systemic inflammatory response syndrome (SIRS) and sepsis, in order to protect or recover organ function. Using a rat model of systemic sterile inflammatory shock (intravenous LPS administration), we performed PET imaging with a translocator protein (TSPO) tracer, [18F]DPA-714, as a biomarker for reactive immunoreactive changes in the brain and peripheral organs. In vivo dynamic PET/CT scans showed increased [18F]DPA-714 binding in the brain, lungs, liver and bone marrow, 4 hours after LPS injection. Post-LPS mean standard uptake values (SUVmean) at equilibrium were significantly higher in those organs compared to baseline. Changes in spleen [18F]DPA-714 binding were variable but generally decreased after LPS. SUVmean values in all organs, except the spleen, positively correlated with several serum cytokines/chemokines. In vitro measures of TSPO expression and immunofluorescent staining validated the imaging results. Noninvasive molecular imaging with [18F]DPA-714 PET in a rat model of systemic sterile inflammatory shock, along with in vitro measures of TSPO expression, showed brain, liver and lung inflammation, spleen monocytic efflux/lymphocytic activation and suggested increased bone marrow hematopoiesis. TSPO PET imaging can potentially be used to quantify SIRS and sepsis-associated organ-level immunoreactivity and assess the effectiveness of therapeutic and preventative approaches for associated organ failures, in vivo.
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