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Comparative properties of monoclonal antibodies comprising a high-affinity anti-fluorescyl idiotype family.

Abstract：

:The T-dependent BALB/c murine immune response to fluorescein (F1) is characterized by structural heterogeneity at the protein level exemplified in part by a significantly wide range of affinities (Ka), and apparent lack of dominant idiotypes. In order to generate an idiotype family, xenogenic anti-idiotype (anti-ID) antibodies raised against anti-F1 monoclonal antibody (MCA) 4-4 (Ka = 1.7 X 10(10) M-1) were used in a solid-phase radioimmunoassay (SPRIA) to screen 68 anti-F1 hybridomas generated from multiple cell fusions for idiotypically related immunoglobulins. Four affinity-purified MCAs (designated 9-40, 10-25, 5-14 and 5-27) bearing 4-4 idiotypic determinants (ID 4-4) exhibited discrete isoelectric focusing spectrotypes (pI range = 6.8-7.7), significantly different fluorescence quenching values (38-95%) of bound ligand, binding affinities ranging from 3.3 X 10(7) to 5.3 X 10(8) M-1, similar active site inaccessibility to iodide, and closely related fine-specificity patterns for fluorescyl analogues. Idiotypic relatedness of each MCA to prototype 4-4 was quantitated by SPRIA, the results demonstrating that: each 125I-labeled MCA bound significantly to solid-phase anti-ID 4-4, and the concns of heterologous MCAs 9-40, 10-25 and 5-14 required for 50% inhibition of 125I-4-4/anti-ID 4-4 binding were comparable to homologous Ig protein. The finding that ID 4-4 bearing anti-F1 MCAs exhibit various binding properties and affinities is consistent with variable-region somatic diversification in anti-F1 affinity maturation.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Bates RM,Ballard DW,Voss EW Jr

doi

10.1016/0161-5890(85)90072-0

subject

Has Abstract

pub_date

1985-08-01 00:00:00

pages

871-7

issue

8

eissn

0161-5890

issn

1872-9142

journal_volume

22

pub_type

杂志文章

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