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Biochemical characterization of an antigen-specific suppressor T cell factor
E Matsushita1, T Sumida, M Tagawa
1Division of Immunology, University of Chiba, School of Medicine, Japan.
International Archives of Allergy and Applied Immunology
|January 1, 1989
Summary
Researchers characterized suppressor T cell factor (TsF2), identifying its biochemical properties. This factor mediates antigen-specific and genetically restricted suppression of immune responses.
Area of Science:
- Immunology
- Molecular Biology
Background:
- Suppressor T cell factors (TsF) play a crucial role in regulating immune responses.
- Understanding the biochemical properties of TsF is essential for elucidating immune regulation mechanisms.
Purpose of the Study:
- To biochemically characterize the suppressor T cell factor (TsF2) secreted by an inducible anti-idiotypic T cell hybridoma.
- To determine the molecular weight and isoelectric point of the functional TsF2 molecule.
Main Methods:
- In vitro functional assays to assess suppressive activity.
- Chromatography, sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), and isoelectric focusing (IEF) for biochemical analysis.
- In vitro translation of hybridoma mRNA and two-dimensional gel electrophoresis.
Main Results:
- TsF2 was found to have a molecular weight of 22-37 kD and an isoelectric point of pH 6.0-6.1.
- In vitro translation products showed similar molecular weight (23-40 kD) and isoelectric point (pH 5.5-6.2) ranges.
- SDS-PAGE under reducing and non-reducing conditions indicated a single-chain active molecule.
- Two spots (28 kD, pH 5.7; 25 kD, pH 5.5) were enhanced in activated hybridomas, correlating with TsF activity.
Conclusions:
- The functional suppressor T cell factor (TsF2) is likely a single-chain molecule.
- The identified molecular weight and isoelectric point ranges provide key biochemical characteristics of TsF2.
- Further investigation of the enhanced spots in activated hybridomas may identify the precise functional molecule responsible for immune suppression.