Abstract
Given the putative selectivity of the antagonist TIPP (Tyr-Tic-Phe-Phe) for δ-opioid receptors (DOP), this compound was selected for the design of a novel 64Cu-radiolabeled potent and selective DOP positron emission tomography (PET) imaging agent. Ex vivo autoradiography of TIPPD-PEG-K(NOTA/64Cu)-NH2 on rat brain sections produced a distribution pattern consistent with the known expression of DOP. Taken together, the in vitro and ex vivo data indicate that this 64Cu-tracer holds promise for studying the DOP by means of PET.
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