Energy metabolism in diabetes
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Mitochondrial Dysfunction and Energy Metabolism in Diabetes
Mitochondria are central to cellular energy metabolism, and their dysfunction is closely linked to the development of insulin resistance in type 2 diabetes (T2DM). Impaired mitochondrial function in tissues such as skeletal muscle and liver disrupts glucose homeostasis and contributes to the progression of T2DM. Factors like mutations in mitochondrial DNA, epigenetic changes, and altered mitochondrial membrane potential can all lead to mitochondrial dysfunction in diabetes Blagov2024Sangwung2020. Reduced mitochondrial activity is also associated with increased ectopic lipid accumulation, further promoting insulin resistance Sangwung2020Roden2019.
Cellular Energy Sensing, AMPK, and Diabetes Treatment
Cells rely on energy sensors to balance nutrient availability and energy demand. In diabetes, a mismatch between these factors is a key contributor to disease development. AMP-activated protein kinase (AMPK) is a crucial energy sensor that, when activated by interventions like exercise, caloric restriction, or metformin, enhances glucose uptake, fatty acid oxidation, and mitochondrial function while suppressing lipid synthesis and inflammation. Conversely, high nutrient levels suppress AMPK activity, worsening metabolic dysfunction. Targeting AMPK and related pathways offers promising therapeutic strategies for diabetes .
Altered Energy Metabolism in Diabetic Organs
Liver Energy Metabolism
In T2DM, the liver shows reduced levels of ATP and inorganic phosphate, indicating impaired energy metabolism even in well-controlled cases. These changes are linked to insulin resistance and can occur before the development of fatty liver (steatosis) . Over time, individuals with T2DM experience a rapid increase in liver fat content, driven by increased adipose tissue and insulin resistance, while hepatic energy metabolism continues to decline . In contrast, people with long-standing type 1 diabetes (T1DM) have lower liver fat but also reduced hepatic energy metabolism .
Cardiac Energy Metabolism
Diabetes alters heart energy metabolism by increasing fatty acid oxidation and decreasing glucose oxidation. This shift reduces cardiac efficiency, increases oxygen consumption, and raises the risk of heart dysfunction due to higher reactive oxygen species and lipotoxicity. Some diabetes medications, such as GLP-1 receptor agonists and SGLT2 inhibitors, may benefit the heart by improving its energy metabolism. Future therapies may focus on directly modifying cardiac energy pathways .
Skeletal Muscle and Whole-Body Energy Expenditure
In T2DM, impaired mitochondrial function in skeletal muscle contributes to insulin resistance and overall metabolic dysfunction Blagov2024Sangwung2020. In T1DM, young adults have higher 24-hour energy expenditure compared to healthy controls, suggesting altered energy metabolism that may require tailored dietary recommendations .
Metabolic Shifts and Biomarkers in Diabetes
Diabetes leads to increased production of ketone bodies and decreased levels of Krebs cycle intermediates and glycolytic products, reflecting a shift in energy substrate utilization. Poor glycemic control (high HbA1c) is associated with increased ketone bodies and bone loss, highlighting the broader impact of energy metabolism disturbances in diabetes .
Insulin Resistance, Lipid Accumulation, and Inflammation
Chronic energy imbalance in diabetes leads to dysfunction in white adipose tissue, increased circulating metabolites, and activation of inflammatory pathways. These changes further disrupt tissue communication and insulin signaling, promoting insulin resistance and increased hepatic glucose production .
Conclusion
Energy metabolism in diabetes is profoundly affected by mitochondrial dysfunction, impaired energy sensing, and shifts in substrate utilization across key organs like the liver, heart, and skeletal muscle. These changes drive insulin resistance, lipid accumulation, and organ-specific complications. Understanding and targeting these metabolic pathways offer promising avenues for improving diabetes management and reducing complications Blagov2024Steinberg2018Panwar2025+6 MORE.
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Monitoring of Energy Metabolism by Organic Acid Profiling Analysis in Plasma of Type 2 Diabetic Mice
Uncontrolled HbA1c levels in type 2 diabetic mice can affect bone loss, ketone body production, and glucose metabolism, with ketone bodies positively correlated to HbA1c levels.
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