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DNA-binding proteins in Yoshida ascites tumor fluid
Biochimica Et Biophysica Acta
|June 15, 1976
Summary
DNA-binding proteins from ascites fluid inhibit tumor growth, unlike those from normal plasma. Their concentrations change with tumor progression, suggesting a role in cancer development.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- DNA-binding proteins are crucial in cellular processes.
- Yoshida ascites tumor provides a model for studying tumor-associated proteins.
Purpose of the Study:
- To isolate and characterize DNA-binding proteins from Yoshida ascites tumor fluid.
- To investigate the biological activity and tumor-specific changes of these proteins.
Main Methods:
- Chromatography (DNA-cellulose, phosphocellulose) for protein isolation.
- Electrophoresis (agarose gel, SDS-polyacrylamide) for protein separation and molecular weight determination.
- Quantitative immunoelectrophoresis and immunoprecipitation for protein identification.
Main Results:
- A fraction of 1-2% of ascites protein consisted of DNA-binding proteins, migrating as alpha and beta globulins.
- Seven specific proteins were identified: beta1-Eglobulin, beta2-glycoprotein I, fibrinogen E, factor XIII, alpha2-macroglobulin, IgG, and IgM.
- Concentrations of fibrinogen E, factor XIII, and IgM increased with tumor age, while others decreased or remained constant.
- The isolated DNA-binding protein fraction from ascites fluid inhibited tumor cell growth, but not fractions from normal plasma.
Conclusions:
- The study identified several key DNA-binding proteins in Yoshida ascites tumor fluid.
- Specific DNA-binding proteins show altered concentrations during tumor progression.
- These ascites-derived DNA-binding proteins possess tumor growth inhibitory properties not found in normal plasma counterparts.