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Exogenous Oncostatin M Induces Cardiac Dysfunction, Muscluloskeletal Atrophy and Fibrosis

ABSTRACT: Musculoskeletal diseases such as muscular dystrophy, cachexia, osteoarthritis, and rheumatoid arthritis impair overall physical health. Patients suffer from increased pain and death rate, decreased productivity and function. Inflammation and fibrosis are commonly observed in musculoskeletal disorders either at the bone, muscle, or joint. The Interleukin-6 Family of Cytokines primarily Interleukin-6 (IL-6) are implicated in the context of musculoskeletal disorders. In this study, we utilized adeno-associated virus expressing murine Oncostatin M or an empty vector at 10^11 viral particles to observe effects in muscle and bone of mice in the presence and absence of Interleukin-6. We performed echocardiography, microCT, quantitative polymerase chain reaction, histology, and RNA-sequencing to characterize the functional effects on muscle and bone. The echocardiography results demonstrated cardiac dysfunction as shown by reduced ejection fraction (%) and fractional shortening (%) with AAV-Osm compared to AAV-Null. RNA-sequencing results on cardiac muscle showed increased cardiac inflammation and fibrosis genes with AAV-Osm. Skeletal muscle weights and histology revealed muscle atrophy and fibrosis in the gastrocnemius, tibialis anterior, and quadriceps of the local limbs injected with AAV-Osm, but not observed in the non-injected side. MicroCT results revealed local and distant trabecular bone loss with AAV-Osm as shown by reduced bone volume, number, thickness, and increased trabeculae separation. Our findings show that Oncostatin M induces cardiac dysfunction, muscle, and bone atrophy independent of Interleukin-6.

ORGANISM(S): Mus musculus

PROVIDER: GSE185996 | GEO | 2022/10/04

REPOSITORIES: GEO

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Project description:Regeneration of skeletal muscle is dependent on the function of tissue-resident muscle stem cells (MuSC), known as satellite cells. MuSC dysfunction is central to muscle pathophysiology, including in age-associated loss of muscle regenerative capacity and congenital disorders such as Duchenne muscular dystrophy. Despite the central role of satellite cells in muscle regeneration, the signals controlling the balance between muscle stem cell quiescence, proliferation, and differentiation remain incompletely understood. Knowledge of the signals that maintain a quiescent state is particularly lacking, yet such cues are crucial to maintaining a stem cell reservoir that can meet the needs of regeneration throughout life. Here we identify Oncostatin M (OSM), a member of the interleukin-6 family of cytokines, as a potent and essential trans-acting regulator of satellite cell quiescence. Key to this discovery is the development of a novel in vivo imaging-based screening strategy allowing identification of proteins that do not induce in vitro proliferation, but instead maintain MuSCs in a non-mitotic state, poised for rapid robust expansion upon transplantation. We demonstrate that OSM induces reversible exit from the cell cycle and induction of a global transcriptional program significantly enriched within a newly established satellite cell “quiescence signature”. Genetic ablation of the OSM receptor in mice demonstrates that signaling via OSM/R is essential for maintenance of satellite cell quiescence, and for proper skeletal muscle regeneration in vivo. Given that aberrant activation and exhaustion of stem cells is seen in a variety of disorders, OSM constitutes an attractive therapeutic target in muscle disease states. Microarray profiling was used to directly test the hypothesis that OSMR signaling in muscle stem cells promotes their engraftment by inducing a global transcriptional state equivalent to that of quiescent, freshly isolated, non-activated MuSC.

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Exogenous Oncostatin M Induces Cardiac Dysfunction, Muscluloskeletal Atrophy and Fibrosis

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