Gallium-68 DOTATATE (or Ga-68 DOTATATE) is a PET radiotracer that is useful for evaluating primary and metastatic well-differentiated neuroendocrine tumors. It is a form of somatostatin-receptor (SSTR) functional imaging and most often combined with cross-sectional imaging in the form of PET-CT.
CAT No: 10-101-338
CAS No:1027785-90-5
Synonyms/Alias:Dotatate gallium Ga-68; Gallium 68 dotatate; 68Ga-DOTATATE; (68Ga)Gallium dotatate
Chemical Name:gallium;2-[4-[2-[[(2R)-1-[[(4R,7S,10S,13R,16S,19R)-10-(4-aminobutyl)-4-[[(1S,2R)-1-carboxy-2-hydroxypropyl]carbamoyl]-7-[(1R)-1-hydroxyethyl]-16-[(4-hydroxyphenyl)methyl]-13-(1H-indol-3-ylmethyl)-6,9,12,15,18-pentaoxo-1,2-dithia-5,8,11,14,17-pentazacycloicos-19-yl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-2-oxoethyl]-7,10-bis(carboxylatomethyl)-1,4,7,10-tetrazacyclododec-1-yl]acetate
Ga-68 DOTA-TATE is a radiolabeled peptide conjugate belonging to the somatostatin analog family, specifically engineered for targeted molecular imaging applications. Structurally, it consists of the peptide Tyr3-octreotate (TATE) linked to the macrocyclic chelator DOTA, which securely complexes the positron-emitting isotope gallium-68. This design endows the compound with high affinity for somatostatin receptor subtype 2 (SSTR2), a biomarker frequently overexpressed in neuroendocrine and certain other tumor cells. Its unique combination of selective receptor binding and radiolabeling capability makes it a critical tool in advancing receptor-targeted imaging and molecular diagnostics research.
Receptor-targeted imaging research: Ga-68 DOTA-TATE serves as a gold-standard probe in the development and optimization of positron emission tomography (PET) imaging protocols targeting SSTR2-expressing tissues. The high specificity of the TATE peptide for SSTR2 enables researchers to visualize and quantify receptor distribution in preclinical tumor models, facilitating studies on receptor density, tumor heterogeneity, and the pharmacodynamics of novel somatostatin analogs. Its robust chelation chemistry ensures reliable radiolabeling, supporting reproducible imaging results for various experimental designs.
Radiotracer validation and tracer development: The compound is widely employed in validating new radiotracer synthesis methods and assessing chelation strategies for gallium-68. Its well-characterized structure and predictable radiochemical behavior make it an ideal reference standard in comparative studies, method development, and quality assessment of radiolabeled peptides. Researchers leverage its consistent performance to benchmark novel DOTA-based conjugates or alternative chelators, thereby advancing the field of peptide-based radiopharmaceutical development.
Somatostatin receptor biology studies: By selectively binding to SSTR2, Ga-68 DOTA-TATE enables detailed investigations into somatostatin receptor expression, regulation, and internalization dynamics. It is instrumental in elucidating receptor-mediated cellular processes, including ligand-receptor interactions, receptor trafficking, and downstream signaling pathways. These studies contribute to a deeper understanding of neuroendocrine tumor biology and the molecular determinants of receptor-targeted agent efficacy.
Preclinical pharmacokinetics and biodistribution analysis: The radiolabeled peptide is routinely utilized in animal models to characterize the in vivo pharmacokinetics, tissue distribution, and clearance profiles of SSTR2-targeted agents. Quantitative PET imaging with this compound allows for precise measurement of tracer uptake in tumors and normal organs, providing critical data for optimizing dosing regimens, minimizing off-target accumulation, and refining candidate selection in drug discovery pipelines.
Radiochemistry training and protocol standardization: Ga-68 DOTA-TATE is frequently incorporated into radiochemistry training programs and laboratory standardization efforts. Its established synthesis and labeling protocols, combined with reliable imaging performance, make it an exemplary teaching tool for radiochemists and imaging scientists. By serving as a model system, it supports best practices in radiolabeling, quality control, and PET imaging methodology, contributing to the advancement of molecular imaging research infrastructure.
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