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Diaminobenzidine oxidation in cerebellar histological sections
Acta Histochemica
|January 1, 1978
Summary
Cerebellar cells oxidize 3,3'-diaminobenzidine (DAB) without added hydrogen peroxide (H2O2). This oxidation occurs in mitochondria, vesicles, and lysosomes, suggesting endogenous enzymatic activity in these cerebellar structures.
Area of Science:
- Neuroscience
- Cell Biology
- Biochemistry
Background:
- 3,3'-diaminobenzidine (DAB) is a common substrate used in histochemistry.
- Hydrogen peroxide (H2O2) is often required for DAB oxidation by enzymes like horseradish peroxidase.
- The endogenous capacity of cerebellar cells to oxidize DAB is not fully understood.
Purpose of the Study:
- To investigate the endogenous oxidation of DAB in cerebellar histological sections.
- To identify the cellular and subcellular locations of DAB oxidation.
- To explore the role of exogenous H2O2 in this process.
Main Methods:
- Incubation of cerebellar histological sections with 3,3'-diaminobenzidine (DAB).
- Microscopic and electron microscopic observation of DAB oxidation.
- Experimentation with and without exogenous H2O2 in the incubation medium.
- Pretreatment with inhibitors (CNK, sodium azide, periodic acid).
Main Results:
- Oximized DAB was detected in all cerebellar cells, independent of exogenous H2O2.
- Erythrocytes showed enhanced DAB oxidation in the presence of H2O2.
- Inhibitors abolished DAB oxidation.
- Electron microscopy localized DAB oxidation to mitochondria, coated vesicles, and lysosomes.
Conclusions:
- Cerebellar cells possess an endogenous system for DAB oxidation.
- Mitochondria, coated vesicles, and lysosomes are key sites for this endogenous oxidation.
- The findings suggest the involvement of endogenous enzymatic pathways in DAB metabolism within the cerebellum.