Research Techniques Made Simple: Skin Carcinogenesis Models: Xenotransplantation Techniques

Area of Science:

• Oncology
• Immunology
• Cell Biology

Background:

• Xenotransplantation is a key method for evaluating human cell tumorigenicity in vivo.
• Immunodeficient mice are essential models for these studies, particularly for skin squamous cell carcinomas (SCCs).
• Understanding SCC behavior and its interaction with the tumor microenvironment is critical for developing effective therapies.

Purpose of the Study:

• To review basic technologies and recent advances in xenotransplantation for studying skin SCCs.
• To highlight various xenotransplantation techniques and their suitability for different experimental designs.
• To discuss methods for studying SCC cell interactions within a more physiologically relevant tumor environment.

Main Methods:

• Isolation and culture of SCC cells or direct injection into immunodeficient mice.
• Utilization of various immunodeficient mouse models tailored to specific tumorigenicity assays.
• Employing subcutaneous injections, epidermal-to-dermal junction injections, and grafting of organotypic cultures.
• Incorporating cancer-associated fibroblasts and real-time microscopy for studying cell interactions.

Main Results:

• Subcutaneous injection is a widely used, simple method but may not fully replicate the native tumor microenvironment.
• Alternative methods like epidermal-to-dermal injections and organotypic cultures offer more relevant tumor microenvironments.
• In vivo real-time tracking of SCC cell and fibroblast interactions is achievable with advanced techniques.

Conclusions:

• Xenotransplantation models are continuously evolving to better mimic the in vivo human SCC tumor microenvironment.
• Advances in xenotransplantation technologies facilitate the study of complex cell-cell interactions within SCCs.
• These refined models are vital for accurately assessing SCC tumorigenic potential and guiding therapeutic strategies.