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Single-cell transcriptomic analysis identifies extensive heterogeneity in the cellular composition of mouse Achilles
Andrea J De Micheli1,2, Jacob B Swanson1, Nathaniel P Disser1
1Hospital for Special Surgery, New York, New York.
American Journal of Physiology. Cell Physiology
|September 3, 2020
Summary
This study reveals the diverse cell types in mouse Achilles tendons using single-cell RNA sequencing, identifying new fibroblast populations and supporting pericytes as tendon progenitors. This tendon atlas aids understanding of tissue maintenance and tendinopathy therapies.
Area of Science:
- Biomaterials Science
- Cell Biology
- Musculoskeletal Research
Background:
- Tendon's role in force transmission is crucial for musculoskeletal function.
- Cellular diversity in tendons is poorly understood but vital for tissue homeostasis and disease.
- Pericytes are implicated as potential progenitor cells for adult tendon fibroblasts.
Purpose of the Study:
- To comprehensively map cellular heterogeneity within mouse Achilles tendons.
- To identify novel cell populations and their functions in tendon biology.
- To elucidate cell-cell interactions governing tendon homeostasis and disease.
Main Methods:
- Single-cell RNA sequencing (scRNA-seq) of mouse Achilles tendons.
- Transcriptomic atlas generation to classify cell populations.
- Trajectory inference analysis to model cell differentiation.
- Cell-cell interaction modeling using ligand-receptor signaling.
Main Results:
- Identification of 11 distinct cell types, including three novel tendon fibroblast populations.
- Transcriptomic atlas reveals significant cellular heterogeneity within tendons.
- Evidence supporting pericytes as a progenitor source for tendon fibroblasts.
- Discovery of previously unknown ligand-receptor interactions in tendon homeostasis.
Conclusions:
- Mouse Achilles tendons exhibit substantial cellular heterogeneity.
- Pericytes are likely progenitors for a subset of adult tendon fibroblasts.
- The developed tendon atlas provides a valuable resource for understanding tendon biology and developing therapies for tendinopathies.
