Genetic lineage tracing of targeted cell populations during enthesis healing

Document Type

Article

Publication Date

12-1-2018

Abstract

Rotator cuff supraspinatus tendon injuries are clinically challenging due to the high rates of failure after surgical repair. One key limitation to functional healing is the failure to regenerate the enthesis transition between tendon and bone, which heals by disorganized scar formation. Using two models of supraspinatus tendon injury in mouse (partial tear and full detachment/repair), the purpose of the study was to determine functional gait outcomes and identify the origin of the cells that mediate healing. Consistent with previous reports, enthesis injuries did not regenerate; partial tear resulted in a localized scar defect adjacent to intact enthesis, while full detachment with repair resulted in full disruption of enthesis alignment and massive scar formation between tendon and enthesis fibrocartilage. Although gait after partial tear injury was largely normal, gait was permanently impaired after full detachment/repair. Genetic lineage tracing of intrinsic tendon and cartilage/fibrocartilage cells (Scx CreERT2 and Sox9 CreERT2 , respectively), myofibroblasts (αSMA CreERT2 ), and Wnt-responsive stem cells (Axin2 CreERT2 ) failed to identify scar-forming cells in partial tear injury. Unmineralized enthesis fibrocartilage was strongly labeled by Sox9 CreERT2 while Axin2 CrERT2 labeled a subset of tendon cells away from the skeletal insertion site. In contrast to the partial tear model, Axin2 CreERT2 labeling showed considerable contribution of Axin2 lin cells to the scar after full detachment/repair. Clinical Significance: Clinically relevant models of rotator cuff tendon injuries in mouse enable the use of genetic tools; lineage tracing suggests that distinct mechanisms of healing are activated with full detachment/repair injuries versus partial tear. © 2018 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:3275–3284, 2018.

Identifier

85052407641 (Scopus)

Publication Title

Journal of Orthopaedic Research

External Full Text Location

https://doi.org/10.1002/jor.24122

e-ISSN

1554527X

ISSN

07360266

PubMed ID

30084210

First Page

3275

Last Page

3284

Issue

12

Volume

36

Grant

R01AR069537

Fund Ref

National Institute of Arthritis and Musculoskeletal and Skin Diseases

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