Antibody-immunotoxin Conjugate Using FcBP-mediated Photoconjugation to Treat Cancer.
Anticancer Res
; 42(7): 3453-3461, 2022 Jul.
Article
em En
| MEDLINE
| ID: mdl-35790260
ABSTRACT
BACKGROUND/AIM:
Cytotoxic payload conjugation to antibodies efficiently suppresses tumors and contributes to the improvement of cancer survival. In our previous study, c-Kit targeting antibody-drug conjugate (2G4-DM1) with DM1, a microtubule inhibitor, efficiently suppressed tumor growth. However, slow-growing c-Kit-positive tumors, such as GIST-48, did not efficiently respond to DM1. In this study, we aimed to treat tumors using 2G4 immunotoxin with Pseudomonas exotoxin A (PE) as a payload. MATERIALS ANDMETHODS:
Modified FcBP-PE24 containing p-benzoyl-L-phenylalanine, unnatural amino acid, was expressed in E. coli and purified. Then, photoconjugation of 2G4 antibody and FcBP-PE24 at 365 nm was carried out and 2G4 immunotoxin was purified using anion exchange chromatography. In vitro cytotoxicity of 2G4 immunotoxins was assessed in HMC-1.2, GIST-48, and MDA-MB-453 cells. Then, in vivo efficacy analysis was performed using C.B-17 SCID mice.RESULTS:
2G4 immunotoxin efficiently induced cytotoxicity in 2G4-DM1-resistant HMC-1.2 and GIST-48 cells by inhibiting protein synthesis but not in c-Kit-negative MDA-MB-453 cells. The results showed ~200-fold or more increase in cytotoxicity against c-Kit-positive cells compared to IC50 of 2G4-DM1. In addition, 2G4 immunotoxin suppressed tumor growth in the in vivo xenograft mouse model.CONCLUSION:
2G4 immunotoxins could be an alternative therapeutic strategy for microtubule inhibitor- resistant cancer cells.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Imunotoxinas
/
Imunoconjugados
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Tumores do Estroma Gastrointestinal
Limite:
Animals
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Humans
Idioma:
En
Ano de publicação:
2022
Tipo de documento:
Article