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Deficiency of membrane-bound dipeptidyl aminopeptidase IV in a certain rat strain
Experientia
|April 15, 1987
Abstract:
The activity of membrane-bound dipeptidyl aminopeptidase IV (EC 3.4.14.5) was found to be markedly reduced in the Fischer 344 rat strain compared with that in the Wistar strain. Analysis of membrane proteins by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and Ouchterlony immunodiffusion revealed the specific absence of this enzyme molecule in the Fischer 344 strain.
Insights
Fischer 344 rats show significantly lower dipeptidyl aminopeptidase IV activity than Wistar rats. This enzyme is completely absent in Fischer 344 rats, as confirmed by protein analysis.
Area of Science:
- Biochemistry
- Enzymology
- Animal Models
Background:
- Membrane-bound dipeptidyl aminopeptidase IV (DPP IV) is a key enzyme involved in various physiological processes.
- Rat strains exhibit genetic variations that can influence enzyme expression and activity.
Purpose of the Study:
- To investigate the differences in dipeptidyl aminopeptidase IV activity between Fischer 344 and Wistar rat strains.
- To determine the molecular basis for any observed differences in enzyme activity.
Main Methods:
- Enzyme activity assays were performed on membrane preparations from both rat strains.
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) was used for protein separation and analysis.
- Ouchterlony immunodiffusion was employed to detect specific enzyme molecules.
Main Results:
- Dipeptidyl aminopeptidase IV activity was markedly reduced in Fischer 344 rats compared to Wistar rats.
- SDS-PAGE and immunodiffusion analyses revealed the complete absence of the dipeptidyl aminopeptidase IV enzyme molecule in Fischer 344 rats.
Conclusions:
- Fischer 344 rats lack the membrane-bound dipeptidyl aminopeptidase IV enzyme.
- This genetic difference may have implications for physiological functions regulated by DPP IV.