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cDNA clones encoding IgE-binding factors from a rat-mouse T-cell hybridoma
Summary
Researchers identified rodent IgE-binding factors (IgE-BF) that can potentiate immunoglobulin E (IgE) responses. These factors may originate from common precursors shared with IgE-suppressive factors.
Area of Science:
- Immunology
- Molecular Biology
Background:
- Immunoglobulin E (IgE) plays a crucial role in allergic reactions.
- Regulation of IgE production involves complex interactions between various immune factors.
- Rodent IgE-binding factors (IgE-BF) have been implicated in modulating IgE responses.
Purpose of the Study:
- To isolate and characterize cDNA clones encoding rodent IgE-binding factors (IgE-BF).
- To investigate the functional role of expressed IgE-BF in vitro.
- To explore the relationship between IgE-potentiating and IgE-suppressive factors.
Main Methods:
- Isolation of cDNA clones from a rat-mouse T hybridoma library.
- Transfection of COS7 cells with isolated cDNAs.
- Expression analysis of IgE-BF in transfected cells.
- Biochemical characterization (glycosylation, molecular weight) and DNA sequence analysis of IgE-BF.
Main Results:
- cDNA clones encoding IgE-BF were successfully isolated.
- Transfected COS7 cells expressed IgE-BF that selectively potentiated in vitro IgE responses.
- Expressed IgE-BF were identified as glycoproteins of approximately 60 kDa and 11 kDa.
- Sequence analysis revealed a 556-amino acid coding region for IgE-BF (62 kDa).
Conclusions:
- IgE-potentiating factors and IgE-suppressive factors likely share common precursor polypeptides.
- The 11 kDa IgE-BF appears to be derived from a 60 kDa precursor protein.