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Cardiotoxin-induced skeletal muscle injury elicits profound changes in anabolic and stress signaling, and muscle fiber type composition

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Abstract

To improve muscle healing upon injury, it is of importance to understand the interplay of key signaling pathways during muscle regeneration. To study this, mice were injected with cardiotoxin (CTX) or PBS in the Tibialis Anterior muscle and were sacrificed 2, 5 and 12 days upon injection. The time points represent different phases of the regeneration process, i.e. destruction, repair and remodeling, respectively. Two days upon CTX-injection, p-mTORC1 signaling and stress markers such as BiP and p-ERK1/2 were upregulated. Phospho-ERK1/2 and p-mTORC1 peaked at d5, while BiP expression decreased towards PBS levels. Phospho-FOXO decreased 2 and 5 days following CTX-injection, indicative of an increase in catabolic signaling. Furthermore, CTX-injection induced a shift in the fiber type composition, characterized by an initial loss in type IIa fibers at d2 and at d5. At d5, new type IIb fibers appeared, whereas type IIa fibers were recovered at d12. To conclude, CTX-injection severely affected key modulators of muscle metabolism and histology. These data provide useful information for the development of strategies that aim to improve muscle molecular signaling and thereby recovery.

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This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

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Conception and design of the study: SD and KK. Data collection and analysis: SD, MR, CP and CH. Analysis and interpretation of the data: SD, LD and KK. Manuscript drafting: SD and KK.

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Correspondence to Katrien Koppo.

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All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted (KU Leuven Animal Ethics Committee; P168/2016).

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Dalle, S., Hiroux, C., Poffé, C. et al. Cardiotoxin-induced skeletal muscle injury elicits profound changes in anabolic and stress signaling, and muscle fiber type composition. J Muscle Res Cell Motil 41, 375–387 (2020). https://doi.org/10.1007/s10974-020-09584-5

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  • DOI: https://doi.org/10.1007/s10974-020-09584-5

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