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Updated: May 15, 2026
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Published on: September 2, 2021
Elevated expression of C3G protein in the peri-infarct myocardium of rats
Liping Wang1, Gang Li, Zhihua Wang
1Division of Cardiology, Department of Geriatrics, The First Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China.
Insights
Crk SH3-domain-binding guanine nucleotide exchange factor (C3G) protein is present in rat heart muscle. Following myocardial infarction, C3G levels significantly increase in non-infarcted areas, suggesting its role in heart failure.
Area of Science:
- Cardiovascular Biology
- Molecular Cardiology
- Integrin Signaling
Background:
- Integrin signaling, involving subunits like integrin β1 and kinases (ILK, FAK), is crucial for managing post-heart attack cardiac remodeling and heart failure.
- Crk SH3-domain-binding guanine nucleotide exchange factor (C3G) is part of the integrin pathway and may influence cardiac remodeling after myocardial infarction.
Purpose of the Study:
- To investigate the expression of C3G protein in the myocardium following experimental myocardial infarction (MI).
- To determine if C3G protein levels change in response to cardiac injury and remodeling.
Main Methods:
- Established rat models of experimental myocardial infarction (MI) and sham operations.
- Quantified C3G protein expression in myocardial tissue using Western blot analysis at 24 hours and 12 weeks post-procedure.
Main Results:
- C3G protein was detected in the myocardium of both sham-operated and MI rats.
- A significant elevation in C3G protein expression was observed in the non-infarcted myocardium of the peri-infarct zones 12 weeks after MI compared to sham groups and early post-MI groups.
Conclusions:
- C3G protein is expressed in rat myocardium.
- Elevated C3G expression in peri-infarct zones after MI suggests a potential role in postinfarction cardiac remodeling, ischemic cardiomyopathy, and heart failure progression.
Background:
The integrin β1 subunit and its downstream molecules such as integrin-linked kinase (ILK) and focal adhesion kinase (FAK) are indispensable to the inhibition of postinfarction cardiac remodeling, ischemic cardiomyopathy, and heart failure. As a component of the integrin pathway, C3G (Crk SH3-domain-binding guanine nucleotide exchange factor) protein may also participate in postinfarction cardiac remodeling, ischemic cardiomyopathy, and heart failure.
Material/Methods:
Experimental myocardial infarction (MI) and sham-operation (sham) models were set up in Sprague-Dawley rats. C3G protein expression in the myocardium in the sham group and in the non-infarcted myocardium of the peri-infarct zones in the MI group was examined by Western blot.
Results:
The C3G protein expression in the myocardium was 0.22±0.06, n=8 in the post-sham 24-hour group; 0.29±0.10, n=8 in the post-MI 24-hour group; 0.22±0.07, n=8 in the post-sham 12-week group; and 0.56±0.14, n=8 in the post-MI 12-week group. The C3G protein expression in the myocardium in the post-MI 12-week group was significantly elevated compared to that in the post-sham 12-week group (p=0.0002), in the post-sham 24-hour group (p=0.0002), and in the post-MI 24-hour group (p=0.0006).
Conclusions:
C3G protein expression exhibits in the myocardium of rats. Furthermore, C3G protein expression is significantly elevated in the non-infarcted myocardium of the peri-infarct zones. The elevated C3G protein expression could participate in postinfarction cardiac remodeling, ischemic cardiomyopathy, and heart failure.
