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Brain enzyme histochemistry following stabilization by microwave irradiation
E Marani1, P Bolhuis, M E Boon
1Laboratory for Anatomy and Embryology, Neuroregulation Group, University of Leiden, The Netherlands.
The Histochemical Journal
|June 1, 1988
Summary
Microwave-saline pretreatment preserves brain enzyme activity for histochemical analysis, while microwave-formalin treatment destroys it. This method allows for successful enzyme and tissue structure visualization.
Area of Science:
- Neuroscience
- Biochemistry
- Histology
Background:
- Enzyme activity and tissue morphology are crucial for brain research.
- Standard fixation methods can compromise enzyme activity, impacting histochemical analyses.
- Microwave irradiation is a potential fixation technique, but its effect on enzyme activity needs clarification.
Purpose of the Study:
- To evaluate the impact of microwave treatments (saline vs. formalin) on brain enzyme activity and histochemical demonstration.
- To determine if microwave-saline pretreatment preserves sufficient enzyme activity and tissue integrity for histochemical and morphological studies.
Main Methods:
- Biochemical assays were performed on brain homogenates after no pretreatment, microwave-saline treatment, and microwave-formalin treatment.
- Histochemical staining was attempted for various enzymes following the same pretreatment conditions.
- Enzyme activities and successful staining were compared across different treatment groups.
Main Results:
- Microwave-formalin treatment abolished all enzyme activity.
- Microwave-saline treatment reduced some enzyme activities but preserved others (e.g., acetylcholinesterase, lactate dehydrogenase, malate dehydrogenase).
- Satisfactory histochemical demonstration was achieved for most enzymes after microwave-saline pretreatment, indicating retained activity and structural integrity.
Conclusions:
- Microwave-saline pretreatment is a viable method for preserving both enzyme activity and tissue morphology for histochemical analysis.
- This technique allows for the successful demonstration of numerous enzymes, aiding in critical morphological investigations.
- Further optimization of staining procedures may enable the histochemical demonstration of enzymes like lactate and malate dehydrogenases, which were not successfully stained under the tested conditions.