dota peptides current knowledge of68Ga-labeled pharmaceuticals - GLP-1peptides is used in the treatment and diagnosis of certain types of cancer The Expanding Role of DOTA Peptides in Medical Imaging and Therapy

JPTpeptides DOTA peptides represent a sophisticated class of molecules that are revolutionizing medical diagnostics and therapeutics, particularly in the field of oncology. At their core, DOTA peptides are peptides that have been conjugated with DOTA, a powerful chelating agent. This conjugation allows for the stable binding of various radionuclides, transforming these peptides into highly effective tools for medical applications. The primary use of DOTA as a complexing agent in medical applications is well-established, enabling precise delivery of radioactive isotopes for both imaging and treatment.

The versatility of DOTA peptides stems from the unique properties of the DOTA molecule. Its macrocyclic structure forms highly stable complexes with a wide range of metal ions, including those used as radionuclides. This stability is crucial for ensuring that the radionuclide remains safely bound to the peptide carrier and is delivered specifically to its intended target in the body. This specificity is a cornerstone of modern precision medicine, minimizing off-target effects and maximizing therapeutic efficacy.

One of the most significant applications of DOTA peptides is in the imaging and treatment of neuroendocrine tumors (NETs)Structural formula of DOTA-TOC.. Radiolabeled DOTA-conjugated peptides are used routinely in adults to image neuroendocrine tumors and are showing great promise for imaging and treating neuroblastomaDOTATATE | DOTA-Conjugated Peptide - MedchemExpress.com. The peptide component of these conjugates is designed to bind to specific receptors that are overexpressed on the surface of these tumor cells. For example, somatostatin receptor antagonists like DOTA-JR11, a somatostatin receptor 2 (SSTR2) antagonist, can be labeled by 68Ga and are used for paired imaging in neuroendocrine tumors (NETs) research. Similarly, DOTATATE (Oxodotreotide) and DOTA-TOC (DOTA-[Tyr3]-octreotide) are octreotate-based peptides featuring a tyrosine substitution at position 3, equipped with a DOTA chelator for radiolabeling. These are extensively utilized in Peptide Receptor Radionuclide Scintigraphy (PRS) and Therapy (PRRT), with examples like 177Lu-DOTA-TATE or 90Y-DOTATOC.

The process of preparing these radiolabeled agents involves careful optimization of labeling procedures of DOTA-peptides177Lu-DOTATATE for the treatment of gastroenteropancreatic .... Research has focused on understanding the kinetics of labelling of DOTA-peptides, with studies indicating that these are optimal at pH 4-4.作者：JK Sosabowski·2006·被引用次数：101—Thepeptideis first conjugated to a chelating agent that is able to form stable complexes with the radionuclide of interest.5Solid-Phase Synthesis of DOTA-Peptides. Deviations from this pH range can significantly impact reaction kinetics, with pH <4 strongly slowing down the process and pH >5 leading to variable reaction rates. Furthermore, the development of techniques to quantify content and purity of DOTA-peptide is essential for ensuring the quality and reliability of these diagnostic and therapeutic agents. Methods involving UPLC (Ultra-Performance Liquid Chromatography) for base-to-base separation and UV-detection are employed to monitor quality and content.

The synthesis of DOTA-peptides itself is another area of active research and developmentStructure and properties of DOTA-chelated ... - PubMed Central. Solid-phase synthesis of DOTA-peptides has emerged as a versatile and controlled method for introducing the DOTA moiety into any location within a peptide sequenceDOTATATE acetate is a DOTA-conjugated peptide. DOTATATE acetate can be labelled with radionuclides for positron emission tomography (PET) imaging.. This approach allows for the creation of custom DOTA-peptide conjugates tailored for specific diagnostic or therapeutic targets作者：WAP Breeman·被引用次数：2—Discuss the stability, specific activity, incorporation yield, and radiochemical purity of thefinal labeled DTPA- and DOTA-conjugated peptides.. The methodology described allows for the versatile, controlled introduction of DOTA into any location within a peptide sequence, providing a potential method for generating a wide array of DOTA-peptide conjugates.

Positron Emission Tomography (PET) imaging has been significantly enhanced by the advent of 68Ga-labeled DOTA-peptides. These compounds are considered promising PET radiotracers used in the detection of different tumour types due to their ability for binding specifically receptors.Conjugation of DOTA-like chelating agents to peptides ... DOTA-peptides for PET imaging can be labelled with 68 Ga up to specific activities of 1 GBq per nmol within 20 minutes, enabling their rapid clinical application.作者：E de Blois·2014—We developed techniques that simulateslabeling procedures of DOTA-peptidesand quality control by UPLC to investigate and improve reaction kinetics. The development and optimization of these labeling techniques, such as those using 68Ga-labeled DOTA-peptides, are crucial for their widespread adoption.

Beyond imaging, DOTA peptides are also employed in therapeutic applications.DOTA-TATE Edotreotide, for instance, is a substance that, when bound to various radionuclides, is used in the treatment and diagnosis of certain types of cancer. This dual capability of diagnosis and therapy, often referred to as theranostics, represents a powerful paradigm shift in cancer management. DOTA is used in cancer therapy and diagnosis, and peptides are frequently used with DOTA.

In summary, DOTA peptides are advanced molecular constructs that leverage the chelating power of DOTA and the targeting specificity of peptides to create potent tools for medical imaging and therapy. Their established use in diagnosing and treating conditions like neuroendocrine tumors, coupled with ongoing research into novel applications and improved synthesis and labeling methods, underscore their critical and expanding role in modern healthcarePreparation of 68Ga-labelled DOTA-peptides using a .... The continuous exploration of DOTA functionalization and its conjugation with various peptides promises further advancements in personalized medicine.