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Evaluation of microsomes isolated from fresh and frozen myotomal tissue of Atlantic cod (Gadus morhua)
Abstract:
Microsomes were isolated from fresh and frozen myotomal tissue of Atlantic cod by two procedures. Electron microscopy revealed one method to yield microsomes containing greater quantities of myofibrillar debris than the other and this was reflected as reduced 5'-nucleotidase, acid phosphatase and succinate dehydrogenase marker enzyme activity. Overnight freezing of myotomal tissue did not affect the marker enzyme activity of microsomes isolated by either procedure. Morphological changes were observed among microsomes prepared from myotomal tissue retained for 8 weeks at -30 degrees C. Accordingly, 5'-nucleotidase was marginally elevated and acid phosphatase and succinate dehydrogenase activity reduced in comparison to fresh microsome preparations.
Insights
Atlantic cod microsome isolation methods were compared. Freezing preserved enzyme activity, but long-term storage altered microsome morphology and enzyme function.
Area of Science:
- Biochemistry
- Marine Biology
- Cell Biology
Background:
- Microsomes are crucial subcellular components for various cellular processes.
- Standardized isolation techniques are vital for accurate biochemical analysis of microsomes.
- Atlantic cod (Gadus morhua) myotomal tissue is a valuable resource for biochemical studies.
Purpose of the Study:
- To compare two microsome isolation procedures from Atlantic cod myotomal tissue.
- To evaluate the impact of short-term (overnight) and long-term (-30°C for 8 weeks) freezing on microsome integrity and enzyme activity.
- To identify optimal methods for preserving microsome quality for research.
Main Methods:
- Isolation of microsomes from fresh and frozen Atlantic cod myotomal tissue using two distinct procedures.
- Electron microscopy to assess microsome morphology and identify myofibrillar debris.
- Assay of marker enzyme activities: 5'-nucleotidase, acid phosphatase, and succinate dehydrogenase.
Main Results:
- One isolation procedure yielded microsomes with significantly less myofibrillar debris compared to the other.
- Reduced marker enzyme activity was observed in microsomes with higher myofibrillar debris content.
- Overnight freezing did not impact marker enzyme activity in microsomes isolated by either method.
- Long-term freezing (8 weeks at -30°C) induced morphological changes and altered enzyme activities (elevated 5'-nucleotidase, reduced acid phosphatase and succinate dehydrogenase).
Conclusions:
- The choice of microsome isolation procedure significantly impacts tissue debris content and enzyme integrity.
- Short-term freezing is suitable for preserving microsome quality in Atlantic cod myotomal tissue.
- Long-term storage at -30°C can compromise microsome morphology and biochemical properties, necessitating careful consideration for extended sample preservation.