Related Experiment Video
Updated: Jul 11, 2026
Examining Muscle Regeneration in Zebrafish Models of Muscle Disease
Published on: January 18, 2021
Bex1 knock out mice show altered skeletal muscle regeneration
Jae Hyung Koo1, Mark A Smiley, Richard M Lovering
1Department of Anatomy and Neurobiology, School of Medicine, University of Maryland Baltimore, Baltimore, MD 21201, USA. jkoo001@umaryland.edu
Abstract:
Bex1 and Calmodulin (CaM) are upregulated during skeletal muscle regeneration. We confirm this finding and demonstrate the novel finding that they interact in a calcium-dependent manner. To study the role of Bex1 and its interaction with CaM in skeletal muscle regeneration, we generated Bex1 knock out (Bex1-KO) mice. These mice appeared to develop normally and are fertile, but displayed a functional deficit in exercise performance compared to wild type (WT) mice. After intramuscular injection of cardiotoxin, which causes extensive and reproducible myotrauma followed by recovery, regenerating muscles of Bex1-KO mice exhibited elevated and prolonged cell proliferation, as well as delayed cell differentiation, compared to WT mice. Thus, our results provide the first evidence that Bex1-KO mice show altered muscle regeneration, and allow us to propose that the interaction of Bex1 with Ca(2+)/CaM may be involved in skeletal muscle regeneration.
Insights
Bone एक्सपोज़र 1 (Bex1) and Calmodulin (CaM) are crucial for skeletal muscle regeneration. Bex1 knockout mice show impaired exercise performance and delayed muscle repair, suggesting Bex1-CaM interaction is vital for muscle recovery.
Area of Science:
- Muscle regeneration
- Molecular biology
- Calcium signaling
Background:
- Bone एक्सपोज़र 1 (Bex1) and Calmodulin (CaM) are known to increase during skeletal muscle regeneration.
- The interaction between Bex1 and CaM, particularly in a calcium-dependent manner, has not been previously established.
Purpose of the Study:
- To investigate the role of Bex1 and its interaction with CaM in skeletal muscle regeneration.
- To determine the functional consequences of Bex1 deficiency in muscle repair and performance.
Main Methods:
- Generation of Bex1 knockout (Bex1-KO) mice.
- Assessment of exercise performance in Bex1-KO and wild-type (WT) mice.
- Induction of myotrauma via cardiotoxin injection followed by analysis of muscle regeneration.
Main Results:
- Bex1-KO mice exhibited normal development and fertility but showed reduced exercise performance compared to WT mice.
- Regenerating muscles in Bex1-KO mice displayed prolonged cell proliferation and delayed cell differentiation post-injury.
- These findings indicate altered muscle regeneration dynamics in the absence of Bex1.
Conclusions:
- The study provides the first evidence of altered skeletal muscle regeneration in Bex1-KO mice.
- The interaction between Bex1 and calcium/Calmodulin (Ca(2+)/CaM) is proposed to play a significant role in the process of skeletal muscle regeneration.
