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Comparative studies on the ultrastructure of malignant melanoma in fish and human by freeze-etching and transmission
Abstract:
Malignant melanomas (MM) in the fish Xiphophorus and in humans were studied both by transmission electron microscopy (TEM) and freeze-etching (FE). In both fish and human melanomas the cells show interdigitations of the plasma membranes. The nuclei are large and lobulated and have many nuclear pores. Melanosomes are abundant and melanosome complexes ("compound melanosomes") occur regularly. Pinocytotic vesicles could be demonstrated in fish and human melanomas showing local differences in frequency and distribution patterns in the tumor. Intercellular junctions are lacking in MM cells from fish and humans. The FE technique showed considerable advantages in demonstrating membrane-surface peculiarities such as nuclear pores or pinocytotic vesicles. The FE replicas of fish melanomas are like those of humans. These findings may support the hypothesis that melanoma in fish and humans reflect the same biological phenomenon.
Insights
This study compared malignant melanomas in fish and humans using advanced microscopy. Findings suggest melanoma in both species shares similar cellular characteristics, supporting a common biological basis.
Area of Science:
- Comparative oncology
- Cell biology
- Electron microscopy
Background:
- Malignant melanoma (MM) is a significant health concern in both humans and aquatic species.
- Understanding the cellular basis of melanoma can provide insights into its development and progression.
Purpose of the Study:
- To compare the ultrastructural features of malignant melanoma cells in Xiphophorus fish and humans.
- To investigate the utility of transmission electron microscopy (TEM) and freeze-etching (FE) in studying melanoma cell morphology.
Main Methods:
- Comparative analysis of malignant melanoma cells from Xiphophorus fish and human subjects.
- Utilized transmission electron microscopy (TEM) for detailed cellular imaging.
- Employed freeze-etching (FE) technique to examine plasma membrane structures and surface features.
Main Results:
- Both fish and human melanoma cells exhibited plasma membrane interdigitations, large nuclei with numerous pores, and abundant melanosomes.
- Pinocytotic vesicles were observed in both species, with variations in frequency and distribution.
- Absence of intercellular junctions was noted in melanoma cells from both fish and humans.
- Freeze-etching (FE) proved advantageous for visualizing membrane structures like nuclear pores and pinocytotic vesicles.
Conclusions:
- The ultrastructural similarities between fish and human malignant melanomas suggest a conserved biological phenomenon.
- Comparative studies using advanced microscopy can elucidate fundamental aspects of melanoma development across species.
- Further research into fish melanoma models may offer valuable insights into human melanoma biology.