Incorporation of a Novel CD16-Specific Single-Domain Antibody into Multispecific Natural Killer Cell Engagers With Potent ADCC

Autor: Seung-Hwan Lee, Michael J. Lowden, Dong-Hyeon Jo, Shannon Ryan, Greg Hussack, Henk van Faassen, Shalini Raphael, Kevin A. Henry, C. Roger MacKenzie
Rok vydání: 2021
Předmět:
medicine.medical_treatment
Pharmaceutical Science
02 engineering and technology
030226 pharmacology & pharmacy
Jurkat Cells
Mice
0302 clinical medicine
Cancer immunotherapy
Neoplasms
Antibodies
Bispecific

Drug Discovery
Antibody-dependent cell-mediated cytotoxicity
biology
Chemistry
Degranulation
hemic and immune systems
021001 nanoscience & nanotechnology
Killer Cells
Natural

medicine.anatomical_structure
bispecific NK cell engager
Molecular Medicine
Biological Assay
Immunotherapy
Antibody
0210 nano-technology
Camelids
New World

CD16
Recombinant Fusion Proteins
Primary Cell Culture
VHH
chemical and pharmacologic phenomena
GPI-Linked Proteins
CD19
Natural killer cell
03 medical and health sciences
Protein Domains
Antigen
Antigens
Neoplasm

medicine
Animals
Humans
single-domain antibody
cancer immunotherapy
Receptors
IgG

Antibody-Dependent Cell Cytotoxicity
Single-Domain Antibodies
natural killer cell
Molecular biology
Macaca fascicularis
nanobody
Single-domain antibody
biology.protein
Zdroj: Molecular Pharmaceutics. 18:2375-2384
ISSN: 1543-8392
1543-8384
DOI: 10.1021/acs.molpharmaceut.1c00208
Popis: Multispecific antibodies that bridge immune effector and tumor cells have shown promising preclinical and clinical efficacies. Here, we isolated and characterized novel llama single-domain antibodies (sdAbs) against CD16. One sdAb, NRC-sdAb048, bound recombinant human and cynomolgus monkey CD16 ectodomains with equivalent affinity (KD: 1 nM) but did not recognize murine CD16. Binding was similar for human CD16a expressed on NK cells and CD16b (NA2) expressed on neutrophils but dramatically weaker (KD: ∼6 μM) for the CD16b (NA1) allotype. The sdAb stained primary human peripheral blood NK cells. Irrespective of fusion orientation and linker length, bispecific sdAb–sdAb and sdAb–scFv dimers (anti-CD16/EGFR, anti-CD16/HER2, and anti-CD16/CD19) retained full binding affinity for each target, coengaged both antigens simultaneously, elicited ADCC against target antigen-expressing tumor cells in a reporter bioassay, and triggered target-specific activation and degranulation of primary NK cells as measured via interferon-γ and CD107a expression. These molecules may have applications in cancer immunotherapy.
Databáze: OpenAIRE