Radiolabeling and in vivo evaluation of [11C]AGH-44: a potential lead structure to develop a positron emission tomography radioligand for the 5-HT7 receptor
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AGH-44 is described as a selective low-basicity serotonin 7 receptor (5-HT7R) agonist. In this paper, we evaluate if AGH-44 can act as a lead structure to develop a 5-HT7R selective positron emission tomography (PET) tracer. 11C-labeling of AGH-44 succeeded in a two-step, one-pot procedure in good yields. Subsequent PET studies showed that [11C]AGH-44 displays low blood–brain-barrier passage in Long–Evans rats. Moreover, [11C]AGH-44 brain accumulation showed to be independent on permeability glycoprotein (P-gp) efflux inhibition. Results from biodistribution and metabolism studies could neither explain the observed low brain uptake. As such, we believe that this scaffold is not an optimal starting point to develop a 5-HT7R selective PET tracer.
|Journal||Journal of Radioanalytical and Nuclear Chemistry|
|Number of pages||5|
|Publication status||Published - 1 Nov 2019|
- 5-HT, AGH-44, Carbon-11, PET