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1.
Int J Mol Sci ; 24(15)2023 Jul 30.
Artigo em Inglês | MEDLINE | ID: mdl-37569582

RESUMO

Prostate-specific membrane antigen (PSMA) has been identified as a target for the development of theranostic agents. In our current work, we describe the design and synthesis of novel N-[N-[(S)-1,3-dicarboxypropyl]carbamoyl]-(S)-L-lysine (DCL) urea-based PSMA inhibitors with a chlorine-substituted aromatic fragment at the lysine ε-nitrogen atom, a dipeptide including two phenylalanine residues in the L-configuration as the peptide fragment of the linker, and 3- or 4-(tributylstannyl)benzoic acid as a prosthetic group in their structures for radiolabeling. The standard compounds [127I]PSMA-m-IB and [127I]PSMA-p-IB for comparative and characterization studies were first synthesized using two alternative synthetic approaches. An important advantage of the alternative synthetic approach, in which the prosthetic group (NHS-activated esters of compounds) is first conjugated with the polypeptide sequence followed by replacement of the Sn(Bu)3 group with radioiodine, is that the radionuclide is introduced in the final step of synthesis, thereby minimizing operating time with iodine-123 during the radiolabeling process. The obtained DCL urea-based PSMA inhibitors were radiolabeled with iodine-123. The radiolabeling optimization results showed that the radiochemical yield of [123I]PSMA-p-IB was higher than that of [123I]PSMA-m-IB, which were 74.9 ± 1.0% and 49.4 ± 1.2%, respectively. The radiochemical purity of [123I]PSMA-p-IB after purification was greater than 99.50%. The initial preclinical evaluation of [123I]PSMA-p-IB demonstrated a considerable affinity and specific binding to PC-3 PIP (PSMA-expressing cells) in vitro. The in vivo biodistribution of this new radioligand [123I]PSMA-p-IB showed less accumulation than [177Lu]Lu-PSMA-617 in several normal organs (liver, kidney, and bone). These results warrant further preclinical development, including toxicology evaluation and experiments in tumor-bearing mice.


Assuntos
Radioisótopos do Iodo , Neoplasias da Próstata , Humanos , Masculino , Animais , Camundongos , Ureia/farmacologia , Distribuição Tecidual , Neoplasias da Próstata/metabolismo , Glutamato Carboxipeptidase II/metabolismo , Antígenos de Superfície/metabolismo , Compostos Radiofarmacêuticos/química , Linhagem Celular Tumoral
2.
Int J Mol Sci ; 24(14)2023 Jul 11.
Artigo em Inglês | MEDLINE | ID: mdl-37511087

RESUMO

Prostate cancer is the second most common cancer among men. We designed and synthesized new ligands targeting prostate-specific membrane antigen and suitable for bimodal conjugates with diagnostic and therapeutic agents. In vitro studies of the affinity of the synthesized compounds to the protein target have been carried out. Based on these ligands, a series of bimodal conjugates with a combination of different mitosis inhibitors and antiandrogenic drugs were synthesized. The cytotoxicity of the compounds obtained in vitro was investigated on three different cell lines. The efficacy of the two obtained conjugates was evaluated in vivo in xenograft models of prostate cancer. These compounds have been shown to be highly effective in inhibiting the growth of PSMA-expressing tumors.


Assuntos
Antagonistas de Androgênios , Neoplasias da Próstata , Masculino , Humanos , Antagonistas de Androgênios/uso terapêutico , Citotoxinas/uso terapêutico , Próstata/patologia , Ligantes , Linhagem Celular Tumoral , Glutamato Carboxipeptidase II/metabolismo , Antígenos de Superfície/metabolismo , Neoplasias da Próstata/metabolismo
3.
Bioorg Med Chem Lett ; 71: 128840, 2022 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-35661685

RESUMO

We report an improved series of ligands targeting prostate specific membrane antigen (PSMA). The new compounds were designed by the introduction of changes in the structure of the aromatic fragment at ε-nitrogen atom of lysine that resulted in improved biological parameters. Some of them demonstrated high selectivity and nanomolar IC50 values. We synthesized and tested two conjugates with a fluorescent label Sulfo-Cy5 as an example of the use of the obtained PSMA inhibitors as a basis for the creation of diagnostic preparations.


Assuntos
Lisina , Neoplasias da Próstata , Antígenos de Superfície , Linhagem Celular Tumoral , Glutamato Carboxipeptidase II , Humanos , Ligantes , Masculino , Nitrogênio
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