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Quantitative isolation of mouse thymus leukemia antigen, TL
Tissue Antigens
|March 1, 1976
Summary
Researchers purified tumor-associated antigen TL from cell lines using protein chemistry methods. TL from tumor cells showed higher specific activity than from established cell lines, an unexplained finding.
Area of Science:
- Biochemistry
- Immunology
- Cell Biology
Background:
- Tumor-associated antigen TL is a cell surface protein found in small amounts.
- Purification of membrane components like TL presents challenges due to low abundance.
Purpose of the Study:
- To describe the purification of TL from papain digests of tumor and established cell lines.
- To evaluate the effectiveness of classical protein chemistry techniques for TL isolation.
Main Methods:
- Papain digestion of cell lines (ASL1 tumor line and L251A established line).
- Gel filtration chromatography.
- Ion-exchange chromatography.
Main Results:
- TL was purified approximately 100-fold from both cell lines.
- TL isolated from the ASL1 tumor line exhibited 1.4 times higher specific activity compared to TL from the L251A cell line.
- The observed difference in specific activity between TL from the two cell lines remains unexplained.
Conclusions:
- Classical protein chemistry methods are suitable for purifying low-abundance membrane components like TL.
- Further investigation is needed to understand the difference in specific activity of TL isolated from different cell types.