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Updated: Apr 27, 2026

Assessment of Mitochondrial Functions and Cell Viability in Renal Cells Overexpressing Protein Kinase C Isozymes
Published on: January 7, 2013
PKC-mediated toxicity of elevated glucose concentration on cardiomyocyte function
High blood glucose levels after myocardial infarction (MI) directly harm heart cells (cardiomyocytes) by activating specific protein kinase C (PKC) enzymes. Inhibiting PKCα and β protects heart cells and restores protective mechanisms.
Area of Science:
- Cardiology
- Molecular Biology
- Biochemistry
Background:
- Mortality risk post-myocardial infarction (MI) correlates with admission blood glucose levels.
- The direct causal link and mechanisms of hyperglycemia-induced cardiotoxicity remain unclear.
Purpose of the Study:
- To investigate the direct cardiotoxic mechanisms of elevated blood glucose.
- To explore the role of protein kinase C (PKC) in hyperglycemia-induced cardiomyocyte dysfunction.
- To assess the impact of hyperglycemia on ischemic preconditioning (IPC).
Main Methods:
- Utilized isolated Wistar rat and guinea-pig cardiomyocytes.
- Employed electric field stimulation (EFS), patch-clamp recording, and Ca2+ imaging to assess cardiomyocyte function.
- Investigated the effects of elevated glucose (5–20 mM) and PKC inhibitors (Gö6976) on simulated ischemia-reperfusion models.
Main Results:
- Increased extracellular glucose prolonged action potential and altered intracellular calcium handling (basal Ca2+ and Ca2+ transient variability).
- Hyperglycemia attenuated ischemic preconditioning (IPC) cardioprotection.
- Inhibition of PKCα and β abolished glucose-induced cardiotoxicity and restored IPC benefits.
- PKCα and β activation masked the protective effects of PKCε.
Conclusions:
- Elevated extracellular glucose causes acute cardiotoxicity mediated by PKCα and β.
- Inhibition of cardiac-specific PKCα and β can abolish these toxic effects and restore cardioprotection.
- These findings support a direct link between hyperglycemia and adverse outcomes post-MI, suggesting PKC inhibition as a potential therapeutic strategy.
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