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Postembedding immunogold electron microscopy for S100, tubulin, and cytoskeletal proteins in an amelanotic malignant
1Department of Pathology, St Joseph's Health Center, London, Ontario, Canada.
Abstract:
A postembedding Protein A-colloidal gold technique was used for the ultrastructural immunocytochemical investigation of S100, tubulin, and cytoskeletal proteins in a Lowicryl K4M-embedded melanoma with numerous microtubules. S100 protein was localized in the cytoplasm and the nuclei of tumor cells. Melanosomes were not labeled with S100. Perinuclear intermediate filaments and filaments in cytoplasmic processes reacted positively for vimentin. The straight, rod-shaped, parallel intracisternal microtubules failed to react with antisera to tubulin, S100, vimentin, cytokeratin, neurofilaments, desmin, glial fibrillary acidic protein, and immunoglobulin light chains. These results give an improved correlation between the ultrastructural and immunocytochemical characteristics of the tumor, confirm the melanocytic origin of it, and demonstrate the application and usefulness of the postembedding immunogold method in the investigation of the protein composition of subcellular structures.
Insights
This study used immunogold labeling to analyze cytoskeletal proteins in melanoma. S100 protein and vimentin were identified, confirming the tumor
Area of Science:
- Cell Biology
- Immunocytochemistry
- Cancer Research
Background:
- Investigating the protein composition of melanoma is crucial for understanding its origin and behavior.
- The postembedding immunogold method offers a powerful tool for high-resolution ultrastructural analysis of cellular proteins.
Observation:
- A melanoma sample embedded in Lowicryl K4M was examined using a Protein A-colloidal gold technique.
- Immunocytochemical staining was performed to localize S100 protein, tubulin, and various cytoskeletal proteins.
Findings:
- S100 protein was detected in the cytoplasm and nuclei of melanoma cells, but not in melanosomes.
- Vimentin was found in perinuclear intermediate filaments and cytoplasmic processes.
- Intracisternal microtubules within the tumor cells did not react with antibodies against tubulin or other tested cytoskeletal proteins.
Implications:
- The findings confirm the melanocytic origin of the investigated melanoma.
- This study highlights the utility of the postembedding immunogold method for detailed protein analysis in subcellular structures.
- The results improve the correlation between ultrastructural features and immunocytochemical characteristics of melanoma.