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Novel Preparation Methods of (52)Mn for ImmunoPET Imaging.

ABSTRACT: (52)Mn (t1/2 = 5.59 d, ?(+) = 29.6%, E?ave = 0.24 MeV) shows promise in positron emission tomography (PET) and in dual-modality manganese-enhanced magnetic resonance imaging (MEMRI) applications including neural tractography, stem cell tracking, and biological toxicity studies. The extension to bioconjugate application requires high-specific-activity (52)Mn in a state suitable for macromolecule labeling. To that end a (52)Mn production, purification, and labeling system is presented, and its applicability in preclinical, macromolecule PET is shown using the conjugate (52)Mn-DOTA-TRC105. (52)Mn is produced by 60 ?A, 16 MeV proton irradiation of natural chromium metal pressed into a silver disc support. Radiochemical separation proceeds by strong anion exchange chromatography of the dissolved Cr target, employing a semiorganic mobile phase, 97:3 (v:v) ethanol:HCl (11 M, aqueous). The method is 62 ± 14% efficient (n = 7) in (52)Mn recovery, leading to a separation factor from Cr of (1.6 ± 1.0) × 10(6) (n = 4), and an average effective specific activity of 0.8 GBq/?mol (n = 4) in titration against DOTA. (52)Mn-DOTA-TRC105 conjugation and labeling demonstrate the potential for chelation applications. In vivo images acquired using PET/CT in mice bearing 4T1 xenograft tumors are presented. Peak tumor uptake is 18.7 ± 2.7%ID/g at 24 h post injection and ex vivo (52)Mn biodistribution validates the in vivo PET data. Free (52)Mn(2+) (as chloride or acetate) is used as a control in additional mice to evaluate the nontargeted biodistribution in the tumor model.

SUBMITTER: Graves SA

PROVIDER: S-EPMC4618027 | biostudies-literature | 2015 Oct

REPOSITORIES: biostudies-literature

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Novel Preparation Methods of (52)Mn for ImmunoPET Imaging.

Graves Stephen A SA Hernandez Reinier R Fonslet Jesper J England Christopher G CG Valdovinos Hector F HF Ellison Paul A PA Barnhart Todd E TE Elema Dennis R DR Theuer Charles P CP Cai Weibo W Nickles Robert J RJ Severin Gregory W GW

Bioconjugate chemistry 20150910 10

(52)Mn (t1/2 = 5.59 d, β(+) = 29.6%, Eβave = 0.24 MeV) shows promise in positron emission tomography (PET) and in dual-modality manganese-enhanced magnetic resonance imaging (MEMRI) applications including neural tractography, stem cell tracking, and biological toxicity studies. The extension to bioconjugate application requires high-specific-activity (52)Mn in a state suitable for macromolecule labeling. To that end a (52)Mn production, purification, and labeling system is presented, and its app ...[more]

PMID: 26317429

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Novel Preparation Methods of (52)Mn for ImmunoPET Imaging.

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Novel Preparation Methods of (52)Mn for ImmunoPET Imaging.

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