Inhibition of TNF-α Restores Muscle Force, Inhibits Inflammation, and Reduces Apoptosis of Traumatized Skeletal Muscles.

Autor: Stratos I; Department of Orthopaedic Surgery, Julius-Maximilians University Wuerzburg, 97074 Wuerzburg, Germany.; Department of Trauma, Hand and Reconstructive Surgery, University of Rostock, 18057 Rostock, Germany., Behrendt AK; Department of Trauma, Hand and Reconstructive Surgery, University of Rostock, 18057 Rostock, Germany.; Institute for Experimental Surgery, University of Rostock, 18057 Rostock, Germany., Anselm C; Institute for Experimental Surgery, University of Rostock, 18057 Rostock, Germany., Gonzalez A; Department of Trauma, Hand and Reconstructive Surgery, University of Rostock, 18057 Rostock, Germany.; Institute for Experimental Surgery, University of Rostock, 18057 Rostock, Germany., Mittlmeier T; Department of Trauma, Hand and Reconstructive Surgery, University of Rostock, 18057 Rostock, Germany., Vollmar B; Institute for Experimental Surgery, University of Rostock, 18057 Rostock, Germany.
Jazyk: angličtina
Zdroj: Cells [Cells] 2022 Aug 03; Vol. 11 (15). Date of Electronic Publication: 2022 Aug 03.
DOI: 10.3390/cells11152397
Abstrakt: Background: Muscle injuries are common in humans and are often associated with irrecoverable damage and disability. Upon muscle injury, TNF-α signaling pathways modulate the healing process and are predominantly associated with tissue degradation. In this study we assumed that TNF-α inhibition could reduce the TNF-α-associated tissue degradation after muscle injury.
Materials and Methods: Therefore, the left soleus muscle of 42 male Wistar rats was injured using a standardized open muscle injury model. All rats were treated immediately after injury either with infliximab (single i.p. injection; 10 mg/kg b.w.) or saline solution i.p. Final measurements were conducted at day one, four, and 14 post injury. The muscle force, the muscle cell proliferation, the muscle cell coverage as well as the myofiber diameter served as read out parameters of our experiment.
Results: Systemic application of infliximab could significantly reduce the TNF-α levels in the injured muscle at day four upon trauma compared to saline treated animals. The ratio of muscle weight to body weight was increased and the twitch muscle force showed a significant rise 14 days after trauma and TNF-α inhibition. Quantification of myofiber diameter in the penumbra zone showed a significant difference between both groups at day one and four after injury, indicated by muscle hypertrophy in the infliximab group. Planimetric analysis of the injured muscle at day 14 revealed increased muscle tissue fraction in the infliximab group compared to the control animals. Muscle cell proliferation did not differ between both groups.
Conclusions: These data provide evidence that the TNF-α blockade positively regulates the restauration of skeletal muscles upon injury.
Databáze: MEDLINE
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