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Updated: Jun 9, 2026
Modeling and Evaluation of Murine Diabetic Cardiomyopathy Model
Published on: November 29, 2024
The Calmodulin/Striatin Interaction Is Enhanced in Diabetic Hearts and Defines Novel Signaling Clusters Implicated in
Stephanie Chacar1, Cynthia Al Hageh2, Liaqat Ali3
1Department of Medical Sciences, College of Medicine and Health Sciences, Khalifa University of Science and Technology, Abu Dhabi, P.O. Box 127788, United Arab Emirates.
Insights
Diabetic cardiomyopathy involves complex protein network changes. Researchers identified key protein interactions with calmodulin and striatin, revealing potential therapeutic targets for heart dysfunction in diabetes.
Area of Science:
- Cardiology
- Molecular Biology
- Proteomics
Background:
- Diabetic cardiomyopathy (DbCM) significantly impairs cardiac function, with limited therapeutic options.
- Calmodulin (CaM) and striatin (STRN) are implicated in DbCM pathogenesis.
- Understanding their protein networks is crucial for developing targeted therapies.
Purpose of the Study:
- To investigate the protein interaction networks of CaM and STRN in the context of diabetic cardiomyopathy.
- To compare the CaM and STRN interactomes in diabetic rat hearts.
- To identify novel protein targets within these networks for potential therapeutic intervention.
Main Methods:
- Utilized CaM as bait for protein precipitation from left ventricles of diabetic rat hearts at 8 and 24 weeks post-streptozotocin (STZ) induction.
- Employed Western blotting to assess protein levels (STRN, PP2A subunits).
- Conducted proteomic analysis to identify differentially interacting proteins (DIPs) with CaM and compared with STRN interactomes.
Main Results:
- Diabetic rats showed pathological cardiac remodeling.
- Proteomic analysis revealed 49 differentially interacting proteins with CaM, with altered interactions in metabolic, lipid, and signaling pathways.
- Comparative analysis identified a shared CaM/STRN signaling hub involving 231 proteins, with Hnrnpm, Acot7, and Gsta3 highlighted as key regulators.
Conclusions:
- The CaM/STRN complex plays a significant role in the molecular mechanisms of diabetic cardiomyopathy.
- Novel protein interactions within the CaM and STRN networks offer insights into metabolic and oxidative remodeling in DbCM.
- This shared signaling hub presents a promising target for future therapeutic strategies against diabetes-associated cardiac deterioration.
Abstract:
Diabetic cardiomyopathy (DbCM) impairs cardiac performance through complex mechanisms, which limits effective therapies. We investigated the protein networks of calmodulin (CaM), a striatin (STRN)-binding protein implicated in DbCM, and compared them with the STRN network from the same tissues. Using CaM as bait, we precipitated protein clusters from left ventricles (LVs) of diabetic rat hearts at 8 and 24 weeks post-streptozotocin (post-STZ). Diabetic rats exhibited pathological remodeling, evidenced by increased heart-to-body weight ratio, β-MHC protein, and ANF mRNA expression. Western blotting showed elevated STRN, but not PP2A-A or -C subunits, in chronic stages. Proteomic analysis at 24 weeks revealed 49 differentially interacting proteins (DIPs) with CaM: 18 enhanced and 31 diminished in diabetic LVs. Functional annotation highlighted the recruitment of proteins in metabolic pathways (fatty acid elongation and lipid metabolism) and PPAR signaling, alongside reduced interactions in lipid response, glucocorticoid response, calcium signaling, and amino acid biosynthesis. Comparative analysis of CaM and STRN interactomes converged to 231 proteins implicated mainly in metabolic processes. Out of these, three proteins (Hnrnpm, Acot7, and Gsta3) surfaced as regulators of metabolic, oxidative, and post-transcriptional remodeling. These findings reveal novel functional roles for the CaM/STRN complex in DbCM and identify a shared signaling hub that may guide therapeutic strategies for diabetes-associated cardiac deterioration.
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