No-carrier-added (nca)-I-meta-Iodobenzylguadine (mIBG) is a clinical agent used for the therapy of Neuroendocrine tumors. It is prepared by reaction of radioiodine with precursors that are chemically different from mIBG. The precursor in few cases is structurally similar and may co-elute along during purification step. Presence of these precursors in final radiolabeled formulation may affect the clinical behaviour of the radiopharmaceutical. The present paper describes the use of Electron-spray ionization-Mass Spectrometry (ESI-MS) where up to nano-molar concentrations of these precursors could be estimated with high precision in the final radiolabeled formulation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.jpba.2018.12.016 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Chlorambucil Conjugation Enhances the Potency of Rituximab: Synthesis and Evaluation of the Novel [Lu]Lu-Labeled Rituximab-Chlorambucil Conjugate toward Therapy of Non-Hodgkin's Lymphoma.
J Med Chem
January 2025
Radiopharmaceuticals Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
In this study, a novel antibody-drug conjugate (ADC) consisting of Rituximab and Chlorambucil (Rituximab-CMB) was synthesized. The average number of drug molecules attached per Rituximab molecule was determined using MALDI-TOF mass spectrometry, revealing a range of 4-6 drug molecules per antibody. To further improve the therapeutic potential of the ADC, it was radiolabeled with the therapeutic radionuclide Lu via a DOTA chelator, achieving a final radiochemical purity of over 95%.
View Article and Find Full Text PDFRadiosynthesis of [18F]-flumazenil Using an Isotopic Approach.
Indian J Nucl Med
November 2024
Department of Neuroimaging and Interventional Radiology, National Institute of Mental Health and Neurosciences, Bengaluru, Karnataka, India.
Background: Fluorine-18 (F) flumazenil (FMZ) has been synthesized using various precursors, and its role has been explored in imaging Gamma-aminobutyric acid-A receptors.
Aim And Objective: The main objective was to synthesize (F) FMZ using isotopic substitution.
Materials And Methods: Around 18 ± 2 GBq was added to the module, dried, and radiolabeling was standardized with 3.
[In]In-RM2: a high potential agent for SPECT imaging of GRPR-expressing tumors.
Phys Eng Sci Med
January 2025
Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), Tehran, 14155-1339, Iran.
Gastrin-releasing peptide receptors (GRPRs) overexpressed in many cancers are known as promising biomarkers to target tumors such as prostate, breast, and lung cancers. As the early diagnosis of the cancers can serve for better treatment of the patients, [In]In-DOTA-Pip-D-Phe-Gln-Trp-Ala-Val-Gly-His-Sta-Leu-NH2 ([In]In-RM2) was prepared using an in-house developed Sn/In generator. 0.
View Article and Find Full Text PDFDevelopment of a homotrimeric PSMA radioligand based on the NOTI chelating platform.
EJNMMI Radiopharm Chem
December 2024
Department of Nuclear Medicine, Saarland University - Medical Center, Kirrbergerstrasse, 66421, Homburg, Germany.
Background: The NOTI chelating scaffold can readily be derivatized for bioconjugation without impacting its metal complexation/radiolabeling properties making it an attractive building block for the development of multimeric/-valent radiopharmaceuticals. The objective of the study was to further explore the potential of the NOTI chelating platform by preparing and characterizing homotrimeric PSMA radioconjugates in order to identify a suitable candidate for clinical translation.
Results: Altogether, three PSMA conjugates based on the NOTI-TVA scaffold with different spacer entities between the chelating unit and the Glu-CO-Lys PSMA binding motif were readily prepared by solid phase-peptide chemistry.
Dopamine internalization via Uptake and stimulation of intracellular D-receptor-dependent calcium mobilization and CDP-diacylglycerol signaling.
Front Pharmacol
October 2024
Department of Biomedical Sciences, School of Medicine, City University of New York, New York, NY, United States.
Dopamine stimulates CDP-diacylglycerol biosynthesis through D-like receptors, particularly the D subtype most of which is intracellularly localized. CDP-diacylglycerol regulates phosphatidylinositol-4,5-bisphosphate-dependent signaling cascades by serving as obligatory substrate for phosphatidylinositol biosynthesis. Here, we used acute and organotypic brain tissues and cultured cells to explore the mechanism by which extracellular dopamine acts to modulate intracellular CDP-diacylglycerol.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!