ABSTRACT
Stimulator of Interferon Genes (STING) plays an important role in innate immunity by inducing type I interferon production upon infection with intracellular pathogens. STING activation can promote increased T-cell activation and inflammation in the tumor microenvironment, resulting in antitumor immunity. Natural and synthetic cyclic dinucleotides (CDNs) are known to activate STING, and several synthetic CDN molecules are being investigated in the clinic using an intratumoral administration route. Here, we describe the identification of STING agonist 15a, a cyclic dinucleotide structurally diversified from natural ligands with optimized properties for systemic intravenous (iv) administration. Our studies have shown that STING activation by 15a leads to an acute innate immune response as measured by cytokine secretion and adaptive immune response via activation of CD8+ cytotoxic T-cells, which ultimately provides robust antitumor efficacy.
Subject(s)
Membrane Proteins/agonists , Nucleotides, Cyclic/chemistry , Pyrimidines/chemistry , Administration, Intravenous , Animals , Binding Sites , Cell Line, Tumor , Half-Life , Humans , Immunotherapy , Membrane Proteins/metabolism , Mice , Molecular Docking Simulation , Neoplasms/pathology , Neoplasms/therapy , Nucleotides, Cyclic/metabolism , Nucleotides, Cyclic/therapeutic use , Phosphates/chemistry , Rats , Structure-Activity Relationship , Transplantation, HeterologousABSTRACT
This manuscript describes an enantioselective synthesis of the naturally occurring inhibitor of endothelial cell proliferation, cortistatin A. Key steps of the synthesis are a silicate-directed elimination/ring expansion reaction and a highly diastereoselective aza-Prins cyclization with a subsequent transannular etherification.
Subject(s)
Endothelial Cells/cytology , Endothelial Cells/drug effects , Neuropeptides/chemical synthesis , Neuropeptides/pharmacology , Cell Proliferation/drug effects , Molecular Structure , Neuropeptides/chemistry , StereoisomerismABSTRACT
This communication reports highly enantioselective and diastereoselective methyl malonic acid half thioester (MeMAHT) aldol reactions that are compatible with protic functional groups and enolizable aldehydes, affording syn S-phenyl thiopropionates.
