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Olthof MGL, Hasler A, Valdivieso P, Flück M, Gerber C, Gehrke R, Klein K, von Rechenberg B, Snedeker JG, Wieser K. Poly(ADP-Ribose) Polymerases-Inhibitor Talazoparib Inhibits Muscle Atrophy and Fatty Infiltration in a Tendon Release Infraspinatus Sheep Model: A Pilot Study. Metabolites 2024; 14:187. [PMID: 38668315 PMCID: PMC11051840 DOI: 10.3390/metabo14040187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 03/13/2024] [Accepted: 03/20/2024] [Indexed: 04/28/2024] Open
Abstract
Structural muscle changes, including muscle atrophy and fatty infiltration, follow rotator cuff tendon tear and are associated with a high repair failure rate. Despite extensive research efforts, no pharmacological therapy is available to successfully prevent both muscle atrophy and fatty infiltration after tenotomy of tendomuscular unit without surgical repair. Poly(ADP-ribose) polymerases (PARPs) are identified as a key transcription factors involved in the maintenance of cellular homeostasis. PARP inhibitors have been shown to influence muscle degeneration, including mitochondrial hemostasis, oxidative stress, inflammation and metabolic activity, and reduced degenerative changes in a knockout mouse model. Tenotomized infraspinatus were assessed for muscle degeneration for 16 weeks using a Swiss Alpine sheep model (n = 6). All sheep received daily oral administration of 0.5 mg Talazoparib. Due to animal ethics, the treatment group was compared with three different controls from prior studies of our institution. To mitigate potential batch heterogeneity, PARP-I was evaluated in comparison with three distinct control groups (n = 6 per control group) using the same protocol without treatment. The control sheep were treated with an identical study protocol without Talazoparib treatment. Muscle atrophy and fatty infiltration were evaluated at 0, 6 and 16 weeks post-tenotomy using DIXON-MRI. The controls and PARP-I showed a significant (control p < 0.001, PARP-I p = 0.01) decrease in muscle volume after 6 weeks. However, significantly less (p = 0.01) atrophy was observed in PARP-I after 6 weeks (control 1: 76.6 ± 8.7%; control 2: 80.3 ± 9.3%, control 3: 73.8 ± 6.7% vs. PARP-I: 90.8 ± 5.1% of the original volume) and 16 weeks (control 1: 75.7 ± 9.9; control 2: 74.2 ± 5.6%; control 3: 75.3 ± 7.4% vs. PARP-I 93.3 ± 10.6% of the original volume). All experimental groups exhibited a statistically significant (p < 0.001) augmentation in fatty infiltration following a 16-week period when compared to the initial timepoint. However, the PARP-I showed significantly less fatty infiltration (p < 0.003) compared to all controls (control 1: 55.6 ± 6.7%, control 2: 53.4 ± 9.4%, control 3: 52.0 ± 12.8% vs. PARP-I: 33.5 ± 8.4%). Finally, a significantly (p < 0.04) higher proportion and size of fast myosin heavy chain-II fiber type was observed in the treatment group. This study shows that PARP-inhibition with Talazoparib inhibits the progression of both muscle atrophy and fatty infiltration over 16 weeks in retracted sheep musculotendinous units.
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Affiliation(s)
- Maurits G. L. Olthof
- Department of Orthopaedics, Balgrist, University of Zurich, Forchstrasse 340, 8008 Zurich, Switzerland; (A.H.); (C.G.); (J.G.S.); (K.W.)
| | - Anita Hasler
- Department of Orthopaedics, Balgrist, University of Zurich, Forchstrasse 340, 8008 Zurich, Switzerland; (A.H.); (C.G.); (J.G.S.); (K.W.)
| | - Paola Valdivieso
- Laboratory for Muscle Plasticity, Department of Orthopedics, Balgrist Campus, University of Zurich, Forchstrasse 340, 8008 Zurich, Switzerland; (P.V.); (M.F.)
| | - Martin Flück
- Laboratory for Muscle Plasticity, Department of Orthopedics, Balgrist Campus, University of Zurich, Forchstrasse 340, 8008 Zurich, Switzerland; (P.V.); (M.F.)
| | - Christian Gerber
- Department of Orthopaedics, Balgrist, University of Zurich, Forchstrasse 340, 8008 Zurich, Switzerland; (A.H.); (C.G.); (J.G.S.); (K.W.)
| | - Rieke Gehrke
- Musculoskeletal Research Unit, Center for Applied Biotechnology and Molecular Medicine, Equine Department, Vetsuisse Faculty, Winterthurerstrasse 190, 8057 Zurich, Switzerland; (R.G.); (K.K.); (B.v.R.)
| | - Karina Klein
- Musculoskeletal Research Unit, Center for Applied Biotechnology and Molecular Medicine, Equine Department, Vetsuisse Faculty, Winterthurerstrasse 190, 8057 Zurich, Switzerland; (R.G.); (K.K.); (B.v.R.)
| | - Brigitte von Rechenberg
- Musculoskeletal Research Unit, Center for Applied Biotechnology and Molecular Medicine, Equine Department, Vetsuisse Faculty, Winterthurerstrasse 190, 8057 Zurich, Switzerland; (R.G.); (K.K.); (B.v.R.)
| | - Jess G. Snedeker
- Department of Orthopaedics, Balgrist, University of Zurich, Forchstrasse 340, 8008 Zurich, Switzerland; (A.H.); (C.G.); (J.G.S.); (K.W.)
- Institute for Biomechanics, ETH Zurich, Gloriastrasse 37/39, 8092 Zürich, Switzerland
| | - Karl Wieser
- Department of Orthopaedics, Balgrist, University of Zurich, Forchstrasse 340, 8008 Zurich, Switzerland; (A.H.); (C.G.); (J.G.S.); (K.W.)
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Schwartz LM. Skeletal Muscles Do Not Undergo Apoptosis During Either Atrophy or Programmed Cell Death-Revisiting the Myonuclear Domain Hypothesis. Front Physiol 2019; 9:1887. [PMID: 30740060 PMCID: PMC6356110 DOI: 10.3389/fphys.2018.01887] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Accepted: 12/12/2018] [Indexed: 12/20/2022] Open
Abstract
Skeletal muscles are the largest cells in the body and are one of the few syncytial ones. There is a longstanding belief that a given nucleus controls a defined volume of cytoplasm, so when a muscle grows (hypertrophy) or shrinks (atrophy), the number of myonuclei change accordingly. This phenomenon is known as the “myonuclear domain hypothesis.” There is a general agreement that hypertrophy is accompanied by the addition of new nuclei from stem cells to help the muscles meet the enhanced synthetic demands of a larger cell. However, there is a considerable controversy regarding the fate of pre-existing nuclei during atrophy. Many researchers have reported that atrophy is accompanied by the dramatic loss of myonuclei via apoptosis. However, since there are many different non-muscle cell populations that reside within the tissue, these experiments cannot easily distinguish true myonuclei from those of neighboring mononuclear cells. Recently, two independent models, one from rodents and the other from insects, have demonstrated that nuclei are not lost from skeletal muscle fibers when they undergo either atrophy or programmed cell death. These and other data argue against the current interpretation of the myonuclear domain hypothesis and suggest that once a nucleus has been acquired by a muscle fiber it persists.
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Affiliation(s)
- Lawrence M Schwartz
- Department of Biology, Morrill Science Center, University of Massachusetts, Amherst, MA, United States
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Kuenzler MB, Nuss K, Karol A, Schär MO, Hottiger M, Raniga S, Kenkel D, von Rechenberg B, Zumstein MA. 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. J Shoulder Elbow Surg 2017; 26:733-744. [PMID: 28131694 DOI: 10.1016/j.jse.2016.11.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 11/02/2016] [Accepted: 11/11/2016] [Indexed: 02/01/2023]
Abstract
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.
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Affiliation(s)
- Michael B Kuenzler
- Shoulder, Elbow and Orthopaedic Sports Medicine, Department of Orthopaedic Surgery and Traumatology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Musculoskeletal Research Unit (MSRU), Equine Department, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - Katja Nuss
- Musculoskeletal Research Unit (MSRU), Equine Department, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - Agnieszka Karol
- Musculoskeletal Research Unit (MSRU), Equine Department, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - Michael O Schär
- Shoulder, Elbow and Orthopaedic Sports Medicine, Department of Orthopaedic Surgery and Traumatology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Michael Hottiger
- Institute of Veterinary Biochemistry and Molecular Biology, University of Zürich, Zürich, Switzerland; Competence Center for Applied Biotechnology and Molecular Medicine (CABMM), Equine Department, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - Sumit Raniga
- Shoulder, Elbow and Orthopaedic Sports Medicine, Department of Orthopaedic Surgery and Traumatology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - David Kenkel
- Department of Diagnostic and Interventional Radiology, University Hospital of Zürich, Zürich, Switzerland
| | - Brigitte von Rechenberg
- Musculoskeletal Research Unit (MSRU), Equine Department, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland; Competence Center for Applied Biotechnology and Molecular Medicine (CABMM), Equine Department, Vetsuisse Faculty, University of Zürich, Zürich, Switzerland
| | - Matthias A Zumstein
- Shoulder, Elbow and Orthopaedic Sports Medicine, Department of Orthopaedic Surgery and Traumatology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Shoulder & Elbow Unit, SportsClinic #1 AG, Bern, Switzerland.
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Schwartz LM, Brown C, McLaughlin K, Smith W, Bigelow C. The myonuclear domain is not maintained in skeletal muscle during either atrophy or programmed cell death. Am J Physiol Cell Physiol 2016; 311:C607-C615. [PMID: 27558160 DOI: 10.1152/ajpcell.00176.2016] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 08/17/2016] [Indexed: 11/22/2022]
Abstract
Skeletal muscle mass can increase during hypertrophy or decline dramatically in response to normal or pathological signals that trigger atrophy. Many reports have documented that the number of nuclei within these cells is also plastic. It has been proposed that a yet-to-be-defined regulatory mechanism functions to maintain a relatively stable relationship between the cytoplasmic volume and nuclear number within the cell, a phenomenon known as the "myonuclear domain" hypothesis. While it is accepted that hypertrophy is typically associated with the addition of new nuclei to the muscle fiber from stem cells such as satellite cells, the loss of myonuclei during atrophy has been controversial. The intersegmental muscles from the tobacco hawkmoth Manduca sexta are composed of giant syncytial cells that undergo sequential developmental programs of atrophy and programmed cell death at the end of metamorphosis. Since the intersegmental muscles lack satellite cells or regenerative capacity, the tissue is not "contaminated" by these nonmuscle nuclei. Consequently, we monitored muscle mass, cross-sectional area, nuclear number, and cellular DNA content during atrophy and the early phases of cell death. Despite a ∼75-80% decline in muscle mass and cross-sectional area during the period under investigation, there were no reductions in nuclear number or DNA content, and the myonuclear domain was reduced by ∼85%. These data suggest that the myonuclear domain is not an intrinsic property of skeletal muscle and that nuclei persist through atrophy and programmed cell death.
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Affiliation(s)
| | - Christine Brown
- Department of Biology, University of Massachusetts, Amherst, Massachusetts
| | - Kevin McLaughlin
- Department of Biology, University of Massachusetts, Amherst, Massachusetts
| | - Wendy Smith
- Department of Biology, Northeastern University, Boston, Massachusetts; and
| | - Carol Bigelow
- Department of Biostatistics and Epidemiology, University of Massachusetts, Amherst, Massachusetts
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Abstract
Tendinopathy is a debilitating musculoskeletal
condition which can cause significant pain and lead to complete rupture
of the tendon, which often requires surgical repair. Due in part
to the large spectrum of tendon pathologies, these disorders continue
to be a clinical challenge. Animal models are often used in this
field of research as they offer an attractive framework to examine
the cascade of processes that occur throughout both tendon pathology and
repair. This review discusses the structural, mechanical, and biological
changes that occur throughout tendon pathology in animal models,
as well as strategies for the improvement of tendon healing. Cite this article: Bone Joint Res 2014;3:193–202.
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Affiliation(s)
- M W Hast
- University of Pennsylvania, McKay Orthopaedic Research Laboratory, 424 Stemmler Hall 36th Street and Hamilton Walk, Philadelphia, 19104-6081, USA
| | - A Zuskov
- University of Pennsylvania, McKay Orthopaedic Research Laboratory, 424 Stemmler Hall 36th Street and Hamilton Walk, Philadelphia, 19104-6081, USA
| | - L J Soslowsky
- University of Pennsylvania, McKay Orthopaedic Research Laboratory, 424 Stemmler Hall 36th Street and Hamilton Walk, Philadelphia, 19104-6081, USA
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