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Guinea-pig lymphotoxin resistant L-cell sublines
Abstract:
Guinea-pig lymphotoxin (GLT)-resistant L-cell sublines were isolated, and the altered properties were characterized. Two of them (No. 1 and No. 2 cells) showed the lowest capacity to absorb GLT and substantially reduced ability to bind labelled Ricinus communis agglutinin (RcA). Both the cell-surface proteins and glycoproteins of No. 2 cells were found to be quite different from those of parental L cells. The glycoprotein of molecular weight 140,000, which specifically bound to RcA-Sepharose, was missing in the No. 2 cells extract. These results indicate that the glycoprotein of molecular weight 140,000 is the most probable candidate for the receptor molecule for GLT, and that No. 2 cells and probably No. 1 cells are GLT receptor-deficient cells.
Insights
Researchers identified guinea-pig lymphotoxin (GLT)-resistant cells lacking a specific 140,000 MW glycoprotein. This suggests the glycoprotein is the GLT receptor, and these cells are GLT receptor-deficient.
Area of Science:
- Cell biology
- Immunology
- Biochemistry
Background:
- Lymphotoxin (LT) is a cytokine involved in inflammation and immunity.
- Understanding LT-receptor interactions is crucial for developing targeted therapies.
- L-cell sublines resistant to GLT were generated to study LT binding.
Purpose of the Study:
- To identify the molecular basis of guinea-pig lymphotoxin (GLT) resistance in L-cell sublines.
- To characterize the cell-surface alterations associated with GLT resistance.
- To determine the potential role of specific glycoproteins in GLT binding.
Main Methods:
- Isolation and characterization of GLT-resistant L-cell sublines (No. 1 and No. 2).
- Assessment of GLT absorption capacity and binding of labeled Ricinus communis agglutinin (RcA).
- Analysis of cell-surface proteins and glycoproteins using biochemical techniques, including RcA-Sepharose affinity chromatography.
Main Results:
- GLT-resistant cell sublines (No. 1 and No. 2) exhibited reduced GLT absorption and RcA binding.
- No. 2 cells showed significant differences in cell-surface proteins and glycoproteins compared to parental L cells.
- A specific 140,000 molecular weight glycoprotein, which binds RcA, was absent in No. 2 cell extracts.
Conclusions:
- The 140,000 MW glycoprotein is strongly implicated as the GLT receptor molecule.
- No. 2 cells, and likely No. 1 cells, are deficient in GLT receptors.
- This finding provides a molecular target for understanding and potentially modulating GLT signaling.