Article Dans Une Revue Journal of Labelled Compounds and Radiopharmaceuticals Année : 2019

Evaluation of [18F]2FP3 in pigs and non-human primates

Résumé

So far, no suitable 5-HT7R radioligand exists for clinical positron emission tomography (PET) imaging. [18F]2FP3 was first tested in vivo in cats, and the results were promising for further evaluations. Here, we evaluate the radioligand in pigs and non-human primates (NHPs). Furthermore, we investigate species differences in 5-HT7R binding with [3H]SB-269970 autoradiography in post-mortem pig, NHP, and human brain tissue. Specific binding of [18F]2FP3 was investigated by intravenous administration of the 5-HT7R specific antagonist SB-269970. [3H]SB-269970 autoradiography was performed as previously described. [18F]2FP3 was synthesized in an overall yield of 35% to 45%. High brain uptake of the tracer was found in both pigs and NHPs; however, pretreatment with SB-269970 only resulted in decreased binding of 20% in the thalamus, a 5-HT7R–rich region. Autoradiography on post-mortem pig, NHP, and human tissues revealed that specific binding of [3H]SB-269970 was comparable in the thalamus of pig and NHP. Despite the high uptake of [18F]2FP3 in both species, the binding could only be blocked to a limited degree with the 5-HT7R antagonists. We speculate that the affinity of the radioligand is too low for imaging the 5-HT7Rs in vivo and that part of the PET signal arises from targets other than the 5-HT7R.

Domaines

Chimie organique
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Dates et versions

hal-02109621 , version 1 (24-01-2025)

Identifiants

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Hanne Hansen, Cristian Constantinescu, Olivier Barret, Matthias Herth, Janus Magnussen, et al.. Evaluation of [18F]2FP3 in pigs and non-human primates. Journal of Labelled Compounds and Radiopharmaceuticals, 2019, 62 (1), pp.34-42. ⟨10.1002/jlcr.3692⟩. ⟨hal-02109621⟩
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