ABSTRACT
The conserved N-linked glycan at the Fc domain of recombinant monoclonal antibodies is an attractive target for site-specific payload conjugation for preparation of homogenous antibody-drug conjugates (ADCs). Here, we report a novel ADC constructing strategy, named "ez-ADiCon", that is achieved by one-step enzymatic transglycosylation of a payload-preloaded bi-antennary glycan oxazoline onto a deglycosylated antibody. In this method, a mixture of different glycoforms of the Fc-glycan is replaced with a pre-defined payload-linked glycan. Since two payloads are linked on each donor glycan substrate, efficient conjugation results in a highly homogenous ADC with mostly-four drug molecules per antibody, facilitating hydrophobic interaction chromatography analysis and purification. We validated this conjugation strategy using Monomethyl auristatin E (MMAE) and an anti-Human epidermal growth factor receptor 2 (anti-Her2) antibody as the model ADC components and demonstrated its target-specific in vitro cytotoxicity. Our novel conjugation strategy, ez-ADiCon, provides a new approach for the preparation of next generation ADCs.
Subject(s)
Antineoplastic Agents , Immunoconjugates , Immunoconjugates/chemistry , Antineoplastic Agents/chemistry , Antibodies, Monoclonal/chemistry , Hydrophobic and Hydrophilic Interactions , Polysaccharides/chemistryABSTRACT
Orexins are a family of neuropeptides that regulate sleep/wakefulness, acting on two G-protein-coupled receptors, orexin receptors 1 (OX1R) and 2 (OX2R). Genetic and pharmacologic evidence suggests that orexin receptor agonists, especially OX2R agonist, will be useful for mechanistic therapy of the sleep disorder narcolepsy/cataplexy. We herein report the discovery of a potent (EC50 on OX2R is 0.023 µM) and OX2R-selective (OX1R/OX2R EC50 ratio is 70) agonist, 4'-methoxy-N,N-dimethyl-3'-[N-(3-{[2-(3-methylbenzamido)ethyl]amino}phenyl)sulfamoyl]-(1,1'-biphenyl)-3-carboxamide 26.
Subject(s)
Benzamides/chemical synthesis , Benzamides/pharmacology , Orexin Receptors/agonists , Sulfonamides/chemical synthesis , Sulfonamides/pharmacology , Animals , CHO Cells , Calcium/metabolism , Cataplexy/drug therapy , Cell Line, Tumor , Cricetinae , Cricetulus , Drug Design , High-Throughput Screening Assays , Humans , Hydrogen Bonding , Models, Molecular , Narcolepsy/drug therapy , Small Molecule Libraries , Structure-Activity Relationship , X-Ray DiffractionABSTRACT
We aimed to discover a novel type of transient receptor potential vanilloid 1 (TRPV1) antagonist because such antagonists are possible drug candidates for treating various disorders. We modified the structure of hit compound 7 (human TRPV1 IC50=411 nM) and converted its pyrrolidino group to a (hydroxyethyl)methylamino group, which substantially improved inhibitory activity (15d; human TRPV1 IC50=33 nM). In addition, 15d ameliorated bladder overactivity in rats in vivo.
Subject(s)
Acetamides/chemistry , Aminopyridines/chemistry , Drug Design , TRPV Cation Channels/antagonists & inhibitors , Acetamides/metabolism , Acetamides/therapeutic use , Aminopyridines/metabolism , Aminopyridines/therapeutic use , Animals , Capsaicin/toxicity , Cystitis/chemically induced , Cystitis/drug therapy , Drug Evaluation, Preclinical , Humans , Protein Binding , Rats , Structure-Activity Relationship , TRPV Cation Channels/metabolismABSTRACT
Various alpha,beta-unsaturated carbonyl compounds were coordinated with aluminum tris(2,6-diphenylphenoxide) (ATPH) to give the corresponding Lewis acid-base complexes in a distinctive coordination fashion (selective coordination). ATPH recognizes carbonyl substrates and subsequently orients itself as it forms a stable complex through selective coordination with the carbonyl oxygen. Selective coordination also confers a conformational preference to each carbonyl compound under the steric and electronic influence of ATPH, which enables the vinylogous aldol reaction of alpha,beta-unsaturated carbonyl compounds to give the corresponding gamma-aldol products with different regio- and stereoselectivities.
