Spatially organized cellular communities shape functional tissue architecture in the pancreas

Area of Science:

• Developmental Biology
• Cellular Biology
• Organogenesis

Background:

• Organ function relies on intricate spatial cell organization, but cell interactions within tissues are poorly understood.
• Defining the spatial arrangement of diverse cell types is crucial for understanding tissue development and function.

Purpose of the Study:

• To map pancreatic cell populations in mice across development and homeostasis using single-cell and spatial transcriptomics.
• To resolve spatial heterogeneity and identify fundamental tissue niches within the pancreas.
• To characterize the developmental diversification and eventual convergence of mesenchymal lineages.

Main Methods:

• Integration of single-cell and spatial transcriptomics.
• Spatial mapping of pancreatic cell populations from embryonic development to adult homeostasis in mice.
• Functional characterization of identified tissue niches in mouse and human models.

Main Results:

• Identification of epithelial-mesenchymal units as basic pancreatic tissue niches.
• Resolution of spatial heterogeneity among pancreatic cell types.
• Demonstration of mesenchymal lineage diversification during development and convergence into fibroblast subtypes in adulthood.
• Functional characterization of identified niches in both mouse and human models.

Conclusions:

• The study reveals how progenitor lineages co-develop and organize into structured communities to form a functional pancreas.
• Epithelial-mesenchymal units are identified as fundamental tissue niches.
• Findings provide a framework for guiding in vitro organogenesis and tissue engineering for pancreatic diseases.