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Khachatryan DS, Kolotaev AV, Malyutina ER, Osipov VN. Synthesis of precursors for obtaining targeted radiopharmaceuticals based on short peptides, analogs of the hormone somatostatin. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3700-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
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The Crystal Structure Elucidation of a Tetrapeptide Analog of Somatostatin DOTA-Phe-D-Trp-Lys-Thr-OMe. CRYSTALS 2021. [DOI: 10.3390/cryst12010012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Herewith, we report for the first time the crystal structure of tetrapeptide FwKT (Phe-D-Trp-Lys-Thr), which is considered to represent an epitope for biomedically relevant hormone somatostatin. The target molecule was successfully crystalized, solved and refined as a conjugate of the tetrapeptide moiety bearing a protective group DOTA at the N-terminus and methylated at the O-terminus. The combination of a hormone active site and a powerful chelator make the substance a highly prospective targeted drug delivery system, especially for peptide receptor radionuclide therapy (PRRT) applications.
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Fedotova AO, Egorova BV, Posypanova GA, Titchenko NA, Khachatryan DS, Kolotaev AV, Osipov VN, Kalmykov SN. Labeling and receptor affinity of an ultra-short somatostatin analogue Thz-Phe-D-Trp-Lys-Thr-DOTA. J Pept Sci 2021; 27:e3361. [PMID: 34291534 DOI: 10.1002/psc.3361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 07/04/2021] [Accepted: 07/06/2021] [Indexed: 11/06/2022]
Abstract
Somatostatin analogues play an important role in the therapy of neuroendocrine tumors by binding to somatostatin receptors on the surface of cancer cells. In this work, we analyze the receptor-binding affinity and in vitro stability of a novel ultra-short somatostatin analogue Thz-Phe-D-Trp-Lys-Thr-DOTA (DOTA-P4). This conjugate is successfully radiolabeled with 44 Sc, 90 Y, 152 Eu, and 207 Bi, characterized and validated by thin layer and high-performance liquid chromatography. The optimum conditions for M-DOTA-P4 labeling are found. In vitro stability studies are performed in saline, in the presence of serum proteins, and with biologically relevant metal cations. All complexes demonstrate no cation release in vitro within 4-24 h. The conformations of DOTA-conjugates are studied by circular dichroism spectroscopy. The circular dichroism spectra of DOTA-P4 conjugates show a negative peak at 225 nm, which may correspond to the required β-sheet conformation. The binding to somatostatin receptors of types 2 and 5 is performed with the IMR-32 cells at 4°C, with non-specific binding representing 26% of the total binding. A two-line approximation of the Scatchard plot results in the apparent dissociation constants of 0.10 and 2.25 nM. It is shown that the chelator position with respect to the amino acid sequence significantly affects the labeling conditions with cations of different ionic radii. For the first time, the binding of a linear type ultra-short peptide conjugate with DOTA to somatostatin receptors is demonstrated. The obtained results are promising for experiments with DOTA-P4 in vivo in mice with inoculated tumors.
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Affiliation(s)
| | - Bayirta V Egorova
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
| | | | | | - Derenik S Khachatryan
- «Kurchatov Institute» National Research Centre, Moscow, Russia.,Institute of Chemical Reagents and High Purity Chemical Substances, «Kurchatov Institute» National Research Centre, Moscow, Russia
| | - Anton V Kolotaev
- «Kurchatov Institute» National Research Centre, Moscow, Russia.,Institute of Chemical Reagents and High Purity Chemical Substances, «Kurchatov Institute» National Research Centre, Moscow, Russia
| | - Vasiliy N Osipov
- «N.N. Blokhin National Medical Research Centre of oncology», Health Ministry of Russia, Moscow, Russia
| | - Stepan N Kalmykov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia.,«Kurchatov Institute» National Research Centre, Moscow, Russia
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Rodin IA, Baygildiev TM, Krylov VI, Osipov VN, Krylov II, Yashkir VA, Rybalchenko IV. Phosphorylation of Tyrosine and Tyr-Thr-Lys Tripeptide with Cyclohexylmethyl- and (Deuteromethyl)phosphonochloridates. RUSS J GEN CHEM+ 2020. [DOI: 10.1134/s1070363220040106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Yakusheva A, Titchenko N, Egorova B, Matazova E, Podkhalyuzina N, Osipov V, Khachatryan D, Avdeev D, Posypanova G, Kalmykov S. From octreotide to shorter analogues: Synthesis, radiolabeling, stability. J Labelled Comp Radiopharm 2019; 62:718-728. [DOI: 10.1002/jlcr.3799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 07/27/2019] [Accepted: 07/29/2019] [Indexed: 12/21/2022]
Affiliation(s)
| | - Nikolay Titchenko
- D. Mendeleev University Of Chemical Technology of Russia; Organic Chemistry division, Moscow Russia
| | - Bayirta Egorova
- Lomonosov Moscow State University; Department of Chemistry, Moscow Russia
| | - Ekaterina Matazova
- Lomonosov Moscow State University; Department of Chemistry, Moscow Russia
| | - Natalya Podkhalyuzina
- D. Mendeleev University Of Chemical Technology of Russia; Organic Chemistry division, Moscow Russia
| | - Vasily Osipov
- N.N. Blokhin National Medical Research Centre of Oncology of the Health Ministry of Russia; Institute of experimental diagnosis and therapy of tumors, Chemical synthesis laboratory, Moscow Russia
| | - Derenik Khachatryan
- NRC “Kurchatov Institute”-IREA; The natural compound laboratory, Moscow Russia
| | - Dmitry Avdeev
- National Medical Research Center for Cardiology; Moscow Russia
| | - Galina Posypanova
- NRC “Kurchatov Institute”; Kurchatov Complex of NBICS Nature-Like Technologies, Cell Biology and Molecular Medicine Lab, Moscow Russia
| | - Stepan Kalmykov
- Lomonosov Moscow State University; Department of Chemistry, Moscow Russia
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Rodin IA, Baygildiev TM, Krylov VI, Osipov VN, Krylov II, Yashkir VA, Rybalchenko IV. Synthesis of the Tripeptides Tyr-Thr-Lys Phosphorylated with Isopropyl Methyl- and (Deuteromethyl)phosphonochloridates as Reference Standards for the Analysis of Biomedical Samples. RUSS J GEN CHEM+ 2019. [DOI: 10.1134/s1070363219100189] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Balaev AN, Osipov VN, Okhmanovich KA, Ruchko EA, Baryshnikova MA, Khachatryan DS. Pentapeptide analogs of somatostatin containing a thiazolidine fragment: synthesis and cytotoxic activity. Russ Chem Bull 2017. [DOI: 10.1007/s11172-016-1683-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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