Tumor-growth inhibition with bispecific antibody fragments in a syngeneic mouse melanoma model: the role of targeted T-cell co-stimulation via CD28.
Int J Cancer
; 80(1): 138-44, 1999 Jan 05.
Article
em En
| MEDLINE
| ID: mdl-9935244
ABSTRACT
The ability of bispecific antibodies with anti-tumor x anti-CD3 specificity to mediate the killing of tumor cells by activated T cells has been demonstrated in many in vitro experiments. Moreover, long-term survival of lymphoma-bearing mice has been observed after treatment with such reagents. The therapeutic effect of bispecific antibodies in solid-tumor models has been less impressive, in particular if fragmented antibodies were used to avoid systemic T-cell activation by bispecific constructs binding to Fc-receptor-positive cells. Here we report that bispecific anti-tumor x anti-CD3-fragments markedly inhibit intraperitoneal as well as pulmonary tumor growth in mice inoculated with B16 melanoma cells, resulting in the long-term survival of animals. Therapeutic success critically depends on the number of recruitable effector cells at the site of tumor growth. A second bispecific construct triggering the co-stimulatory CD28-molecule on the T-cell surface increased tumor-cell killing in vitro and in vivo, despite rather low avidity of this reagent to mouse T cells. Finally, long-term-surviving animals showed improved survival after i.v. rechallenge with tumor cells, indicating that bispecific antibodies are capable of inducing long-lasting protective immunity.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Melanoma Experimental
/
Ativação Linfocitária
/
Receptores Fc
/
Linfócitos T
/
Complexo CD3
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Antígenos CD28
/
Anticorpos Biespecíficos
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Int J Cancer
Ano de publicação:
1999
Tipo de documento:
Article