Immunotoxin-mediated inhibition of chronic lymphocytic leukemia cell proliferation in humans.
Cancer Res
; 49(12): 3328-32, 1989 Jun 15.
Article
en En
| MEDLINE
| ID: mdl-2785850
ABSTRACT
We evaluated the cytotoxicity of the immunotoxin OKT1-SAP on fresh B-chronic lymphocytic leukemia (B-CLL) cells from 31 consecutive patients. OKT1-SAP comprised the OKT1 (CD5) monoclonal antibody disulfide linked to saporin-6 (SAP) ribosome-inactivating protein from the plant Saponaria officinalis. The effect of OKT1-SAP on target CD5-positive B-CLL cells was estimated using an in vitro proliferation inhibition assay in which control or OKT1-SAP-treated B-CLL cells were induced to proliferate by sequential stimulation with insolubilized anti-C3b receptor CB04 (CD35) antibody and low molecular weight B-cell growth factor. In 90% of patients, OKT1-SAP specifically suppressed B-CLL cell proliferation in a dose-related manner (50% inhibitory concentration, 4.0-6.8 nM). Taken together the findings reported in this article provide information relevant to the clinical development of immunotoxins because (a) the in vitro conditions under which B-CLL cell proliferation is inhibited by OKT1-SAP are achievable in vivo without nonspecific toxicity according to our previous toxicology and pharmacokinetics studies in primates; and (b) the B-CLL cell proliferation inhibition assay described here provides a basis for future comparative studies.
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Banco de datos:
MEDLINE
Asunto principal:
Proteínas de Plantas
/
Células Tumorales Cultivadas
/
Leucemia Linfocítica Crónica de Células B
/
Inmunotoxinas
/
Antineoplásicos Fitogénicos
/
N-Glicosil Hidrolasas
Límite:
Aged
/
Female
/
Humans
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Male
/
Middle aged
Idioma:
En
Año:
1989
Tipo del documento:
Article