Products Cited in Publications Worldwide Comparison of Technetium-99m-Labeled Pentapeptides as Bone Imaging Agents: Influence of Different Types of Acidic Amino Acids

Comparison of Technetium-99m-Labeled Pentapeptides as Bone Imaging Agents: Influence of Different Types of Acidic Amino Acids

Effendi, Nurmaya; Munekane, Masayuki; Malik, Abd; Putra, Amal Rezka; Patrianesha, Bisma Barron; Ritawidya, Rien; Hu, Xiaojun; Fuchigami, Takeshi; Mishiro, Kenji; Wakabayashi, Hiroshi

DOI: PMID:

Abstract

Bone-seeking radiopharmaceuticals are essential for the early detection of bone metastases. In this study, we developed three Technetium-99m (99mTc)-labeled oligopeptides composed of acidic amino acids and evaluated their bone-targeting ability. Hydrazinonicotinamide (HYNIC)-conjugated oligopeptides with five residues of aspartic acid (Asp), glutamic acid (Glu), or γ-carboxyglutamic acid (Gla) were synthesized and radiolabeled with 99mTc using tricine and 3-acetylpyridine as co-ligands. Their hydroxyapatite binding, in vitro stability, biodistribution, and single-photon emission computed tomography (SPECT)/CT imaging in normal mice were evaluated. Among the three tracers, [99mTc]Tc-HYNIC-(tricine)(AcP)-(dl-Gla)5 ([99mTc]3) showed the highest hydroxyapatite binding and bone uptake, with clear visualization in SPECT/CT. All compounds exhibited high radiochemical purity and in vivo stability. Oligopeptides containing Gla residues exhibited superior bone affinity and imaging performance, suggesting that Gla-based oligopeptides are promising scaffolds for the development of 99mTc-labeled bone imaging agents.

Keywords

bone-seeking agent ; bone metastasis ; Tc-99m ; peptide ; nuclear medicine imaging

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