Decoding Cellular Communication Networks and Signaling Pathways in Bone, Skeletal Muscle, and Bone-Muscle Crosstalk...

Area of Science:

• Musculoskeletal biology
• Systems biology
• Spatial transcriptomics

Background:

• Bone and skeletal muscle are vital for movement and systemic regulation.
• Inter-tissue communication is crucial for maintaining tissue integrity.
• Disruptions in bone-muscle crosstalk contribute to diseases like osteoporosis and sarcopenia.

Purpose of the Study:

• To create the first spatially resolved map of cell-cell communication between mouse femur bone and adjacent skeletal muscle.
• To identify key ligand-receptor interactions and signaling pathways involved in bone-muscle crosstalk.

Main Methods:

• Utilized 10X Genomics Visium spatial transcriptomics (ST) profiling.
• Applied advanced computational tools to analyze gene expression and cell-cell interactions.
• Characterized eight major cell types within the bone and muscle tissues.

Main Results:

• Identified distinct spatial gene expression profiles for eight cell types.
• Revealed 13 key signaling pathways, including COLLAGEN, THBS, and VEGF, mediating intra- and inter-tissue communication.
• Discovered specific ligand-receptor pairs critical for osteoblast-ECM, muscle-endothelial, and immune cell-osteoblast signaling.

Conclusions:

• Presents a comprehensive, spatially resolved atlas of bone-muscle molecular crosstalk.
• Provides novel insights into the mechanisms underlying musculoskeletal tissue communication.
• Establishes a foundation for developing targeted therapies for musculoskeletal disorders.