Multimodal Analysis of Composition and Spatial Architecture in Human Squamous Cell Carcinoma

Area of Science:

• Oncology
• Dermatology
• Genomics

Background:

• Cutaneous squamous cell carcinoma (cSCC) is a common skin cancer with complex cellular interactions.
• Understanding the cellular composition and spatial architecture of cSCC is crucial for developing effective treatments.

Purpose of the Study:

• To comprehensively define the cellular composition and architecture of human cSCC.
• To identify novel tumor-specific cell populations and their microenvironmental interactions.
• To elucidate the molecular networks driving cSCC tumorigenesis.

Main Methods:

• Integration of single-cell RNA sequencing (scRNA-seq), spatial transcriptomics, and multiplexed ion beam imaging (MIBI).
• Analysis of human cSCC tissues and matched normal skin samples.
• In vivo characterization using human tumor xenografts and CRISPR screens.

Main Results:

• Identified four distinct tumor subpopulations in cSCC, including a novel tumor-specific keratinocyte (TSK) population within a fibrovascular niche.
• Mapped ligand-receptor networks, revealing TSK cells as central hubs for intercellular communication.
• Observed features of immunosuppression, such as T regulatory cell (Treg) and CD8 T cell co-localization in tumor stroma.
• Discovered essential gene networks driving tumorigenesis through in vivo models.

Conclusions:

• This study provides a detailed cellular and spatial map of cSCC, highlighting TSK cells and their niche.
• The findings reveal key intercellular communication pathways and immunosuppressive mechanisms in cSCC.
• Identified critical gene networks essential for cSCC development, offering potential therapeutic targets.