Neer Award 2016: reduced muscle degeneration and decreased fatty infiltration after rotator cuff tear in a poly(ADP-ribose) polymerase 1 (PARP-1) knock-out mouse model.

Künzler, MB; Nuss, Katja; Karol, Agnieszka; Schär, MO; Hottiger, Michael; Raniga, Sumit; Kenkel, David; von Rechenberg, Brigitte; Zumstein, M (2017). Neer Award 2016: reduced muscle degeneration and decreased fatty infiltration after rotator cuff tear in a poly(ADP-ribose) polymerase 1 (PARP-1) knock-out mouse model. Journal of shoulder and elbow surgery, 26(5), pp. 733-744. Elsevier 10.1016/j.jse.2016.11.009

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BACKGROUND

Disturbed muscular architecture, atrophy, and fatty infiltration remain irreversible in chronic rotator cuff tears even after repair. Poly (adenosine 5'-diphosphate-ribose) polymerase 1 (PARP-1) is a key regulator of inflammation, apoptosis, muscle atrophy, muscle regeneration, and adipocyte development. We hypothesized that the absence of PARP-1 would lead to a reduction in damage to the muscle subsequent to combined tenotomy and neurectomy in a PARP-1 knockout (KO) mouse model.

METHODS

PARP-1 KO and wild-type C57BL/6 (WT group) mice were analyzed at 1, 6, and 12 weeks (total n = 84). In all mice, the supraspinatus and infraspinatus muscles of the left shoulder were detached and denervated. Macroscopic analysis, magnetic resonance imaging, gene expression analysis, immunohistochemistry, and histology were used to assess the differences in PARP-1 KO and WT mice.

RESULTS

The muscles in the PARP-1 KO group had significantly less retraction, atrophy, and fatty infiltration after 12 weeks than in the WT group. Gene expression of inflammatory, apoptotic, adipogenic, and muscular atrophy genes was significantly decreased in PARP-1 KO mice in the first 6 weeks.

DISCUSSION

Absence of PARP-1 leads to a reduction in muscular architectural damage, early inflammation, apoptosis, atrophy, and fatty infiltration after combined tenotomy and neurectomy of the rotator cuff muscle. Although the macroscopic reaction to injury is similar in the first 6 weeks, the ability of the muscles to regenerate was much greater in the PARP-1 KO group, leading to a near-normalization of the muscle after 12 weeks.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Department of Orthopaedic, Plastic and Hand Surgery (DOPH) > Clinic of Orthopaedic Surgery

UniBE Contributor:

Künzler, Michael; Schär, Michael and Zumstein, Matthias

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1058-2746

Publisher:

Elsevier

Language:

English

Submitter:

Lilianna Bolliger

Date Deposited:

19 Jul 2017 13:07

Last Modified:

01 Jun 2018 02:30

Publisher DOI:

10.1016/j.jse.2016.11.009

PubMed ID:

28131694

Uncontrolled Keywords:

ARTD1; PARP-1; Rotator cuff tear; fatty infiltration; inflammation; knock out mouse model; muscle atrophy; supraspinatus muscle

BORIS DOI:

10.7892/boris.95331

URI:

https://boris.unibe.ch/id/eprint/95331

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