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  2. Synthesis and preliminary in vitro evaluation of DOTA-Tenatumomab conjugates for theranostic applications in tenascin expressing tumors

Synthesis and preliminary in vitro evaluation of DOTA-Tenatumomab conjugates for theranostic applications in tenascin expressing tumors

  • Bioorg Med Chem. 2019 Aug 1;27(15):3248-3253. doi: 10.1016/j.bmc.2019.05.047.
Giuseppe Giannini 1 Ferdinando Maria Milazzo 2 Gianfranco Battistuzzi 2 Antonio Rosi 2 Anna Maria Anastasi 2 Fiorella Petronzelli 2 Claudio Albertoni 3 Lorenzo Tei 4 Loredana Leone 4 Laura Salvini 5 Rita De Santis 2
Affiliations

Affiliations

  • 1 Biotechnology R&D Alfasigma SpA, Via Pontina, Km 30.400, 00071 Pomezia, Italy. Electronic address: giuseppe.giannini@alfasigma.com.
  • 2 Biotechnology R&D Alfasigma SpA, Via Pontina, Km 30.400, 00071 Pomezia, Italy.
  • 3 Studio E Roma, Via della Bufalotta 845, Roma, Italy.
  • 4 Dipartimento di Scienze e Innovazione Tecnologica, Università del Piemonte Orientale (UPO), Viale T. Michel 11, 15121 Alessandria, Italy.
  • 5 Toscana Life Sciences Foundation (TLS), Via Fiorentina 1, 53100 Siena, Italy.
Abstract

Tenatumomab is an anti-tenascin murine monoclonal antibody previously used in clinical trials for delivering radionuclides to tumors by both pre-targeting (biotinylated Tenatumomab within PAGRIT) and direct 131Iodine labeling approaches. Here we present the synthesis and in vitro characterization of three Tenatumomab conjugates to bifunctional chelating agents (NHS-DOTA, NCS-DOTA and NCS-DTPA). Results indicate ST8198AA1 (Tenatumomab-DOTAMA, derived by conjugation of NHS-DOTA), as the most promising candidate in terms of conjugation rate and yield, stability, antigen immunoreactivity and affinity. Labeling efficiency of the different Chelators was investigated with a panel of cold metals indicating DOTAMA as the best chelator. Labeling of Tenatumomab-DOTAMA was then optimized with several metals and stability performed confirms suitability of this conjugate for further development. ST8198AA1 represents an improvement of the previous antibody forms because the labeling with radionuclides like 177Lu or 64Cu would allow theranostic applications in patients bearing tenascin expressing tumors.

Keywords

Cancer; Chelating ligands; Radionuclide therapy; Tenascin; Tenatumomab; Theranostic.

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