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A lectin-like substance from bovine spleen
The Japanese Journal of Experimental Medicine
|December 1, 1979
Summary
Researchers isolated bovine spleen binding protein (BSBP), a substance that binds to aged red blood cells by recognizing galactose residues. This discovery may shed light on the clearance of older erythrocytes.
Area of Science:
- Biochemistry
- Immunology
- Hematology
Background:
- Sialic acid is crucial for erythrocyte surface charge and function.
- Changes in sialic acid levels are associated with erythrocyte aging.
- The spleen plays a role in clearing aged or damaged blood cells.
Purpose of the Study:
- To isolate and characterize a novel lectin-like substance from bovine spleen.
- To investigate the binding specificities and properties of this substance.
- To explore its potential physiological role in erythrocyte clearance.
Main Methods:
- Purification of a lectin-like substance from bovine spleen.
- Erythrocyte binding assays using normal and sialidase-treated bovine erythrocytes.
- Biochemical characterization including molecular weight determination and isoelectric focusing.
- Assessment of mitogenic activity on human lymphocytes.
Main Results:
- A lectin-like protein, bovine spleen binding protein (BSBP), was purified.
- BSBP specifically binds to sialidase-treated bovine erythrocytes, recognizing terminal galactose residues.
- BSBP has an approximate molecular weight of 240,000, an acidic pI of 4.8, and contains 13% carbohydrates.
- BSBP exhibits mitogenic activity towards human peripheral lymphocytes.
Conclusions:
- Bovine spleen binding protein (BSBP) is a galactose-binding lectin.
- BSBP may be involved in the clearance of aged erythrocytes with reduced sialic acid.
- Further research is needed to fully elucidate the physiological function of BSBP.