Evidence for homology of normal and neoplastic human placental alkaline phosphatases as determined by monoclonal antibodies to the cancer-associated enzyme.
Cancer Res
; 45(7): 3268-73, 1985 Jul.
Article
en En
| MEDLINE
| ID: mdl-2408748
The HeLa TCRC-1 human adenocarcinoma cell line expresses a form of alkaline phosphatase that is similar to the common S-variant of placental alkaline phosphatase (PLAP) on the basis of electrophoretic mobility, catalytic properties, and reactivity with polyclonal antibodies. More sensitive probes of changes in protein structure than polyclonal antibodies are monoclonal antibodies (MAbs) which recognize individual antigenic sites on molecules. Therefore, we produced MAbs to HeLa TCRC-1 cells and selected those which bound to the alkaline phosphatase expressed by the cancer cells. Seven MAbs were obtained and characterized by (a) fine specificity analysis using allelic variants of PLAP and other human alkaline phosphatase isozymes, (b) immunoglobulin isotype, and (c) relative binding affinities to PLAP from two sources, placental tissue and HeLa TCRC-1 cells. The seven MAbs bind the enzymes from both sources with equal affinity indicating a high degree of structural homology if not identity between the normal S-variant of PLAP and its cancer-associated counterpart. We note that most of the MAbs to cancer cell surface-bound PLAP express either Ig (immunoglobulin) G2a or IgG2b heavy-chain isotypes, a higher incidence of these classes of IgG than has been observed with the purified and soluble PLAP immunogen which yields MAbs predominantly of the IgG1 isotype. Finally, some of these antibodies, like the ones prepared from purified PLAP, recognize differences between allelic variants.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Placenta
/
Fosfatasa Alcalina
/
Anticuerpos Monoclonales
/
Neoplasias
Tipo de estudio:
Risk_factors_studies
Límite:
Female
/
Humans
/
Pregnancy
Idioma:
En
Revista:
Cancer Res
Año:
1985
Tipo del documento:
Article
Pais de publicación:
Estados Unidos