SSTR2 Ligand

TATE-DA-I is a somatostatin receptor 2 (SSTR2) ligand with an IC₅₀ of 25.3 nM. TATE-DA-I binds to albumin to prolong its circulation retention time and also exhibits enhanced tumor accumulation capacity. TATE-DA-I enables clear visualization of SSTR2-positive tumors in SPECT/CT imaging. TATE-DA-I can be used in cancer-related research.

Tyr3-Octreotate is a ligand for somatostatin receptor subtype 2 (sst2), with an IC₅₀ value of 1.3 nM against sst2 when labeled with [¹¹¹In-DTPA], and an IC₅₀ value of 1.6 nM against sst2 when labeled with [⁹⁰Y-DOTA]. Radiolabeled Tyr3-Octreotate generates cell-associated radioactivity, and acts as both a tumor growth inhibitor and a tumor cytotoxic agent. When radiolabeled with ¹⁷⁷Lu or ⁹⁰Y, Tyr3-Octreotate serves as a peptide receptor radionuclide therapy (PRRT) analog. Tyr3-Octreotate can be used in studies related to pancreatic tumors.

JR11-PEG3-DOTA-PSMA-03 (Compound 2) is an RDC-related compound containing the chelating agent DOTA (HY-W053583), the JR11 peptide (SSTR2 antagonist), and the PSMA ligand. JR11-PEG3-DOTA-PSMA-03 shows SSTR2-binding affinities and PSMA-binding affinities, with IC₅₀ s of 94.0 nM, 81.8 nM, respectively. JR11-PEG3-DOTA-PSMA-03 can be radiolabeled with [⁶⁸Ga]. [⁶⁸Ga] radiolabeled JR11-PEG3-DOTA-PSMA-03 can be used in diagnostic studies of neuroendocrine differentiated prostate cancer.