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Canine neutrophil plasma membrane markers
Biochimica Et Biophysica Acta
|April 11, 1985
Summary
This study identified 5'-nucleotidase and magnesium-dependent adenosine triphosphatase (Mg2+-ATPase) as canine neutrophil plasma membrane markers. Leucine aminopeptidase was found in intracellular granules, not the plasma membrane.
Area of Science:
- Canine immunology
- Cell biology
- Enzymology
Background:
- Identifying specific cell surface markers is crucial for understanding neutrophil function.
- Canine neutrophil plasma membranes are not fully characterized regarding enzyme localization.
- Previous studies suggested several enzymes as potential plasma membrane markers.
Purpose of the Study:
- To determine the precise localization of 5'-nucleotidase, Mg2+-ATPase, and leucine aminopeptidase in canine neutrophils.
- To identify reliable enzyme markers for the canine neutrophil plasma membrane.
Main Methods:
- Enzyme activity assays were performed on isolated canine neutrophils.
- Cell fractionation using nitrogen cavitation and Percoll-density gradient centrifugation was employed.
- Specific enzyme inhibitors were used to confirm localization.
Main Results:
- 5'-nucleotidase and Mg2+-ATPase were confirmed as ectoenzymes on the canine neutrophil plasma membrane.
- Additional intracellular Mg2+-ATPase activity was detected.
- Leucine aminopeptidase was exclusively localized to myeloperoxidase-containing granules.
- An endogenous inhibitor of 5'-nucleotidase was identified in the neutrophil cytosol.
Conclusions:
- 5'-nucleotidase and Mg2+-ATPase are valid markers for canine neutrophil plasma membranes.
- Leucine aminopeptidase is not a plasma membrane marker but is localized to specific granules.
- Understanding enzyme localization aids in characterizing neutrophil subpopulations and functions.