Molecular Mechanisms in Diabetic Kidney Disease

Diabetic kidney disease arises from a complex interplay of metabolic, haemodynamic and inflammatory processes triggered by chronic hyperglycaemia. Persistent high glucose levels promote the formation of advanced glycation end-products and the overproduction of reactive oxygen species, which together activate pro-fibrotic and pro-inflammatory signalling cascades. Key molecular pathways include transforming growth factor-β/Smad, Wnt/β-catenin and PI3K/Akt, each contributing to alterations in the glomerular filtration barrier. Podocytes, specialised epithelial cells that maintain slit-diaphragm integrity, undergo injury and loss via apoptosis, epithelial–mesenchymal transition and cytoskeletal disorganisation. Glomerular endothelial cells suffer oxidative damage and impaired nitric oxide bioavailability, compromising filtration surface area and promoting basement membrane thickening. Mesangial cells respond to hyperglycaemia with extracellular matrix accumulation, driven by connective tissue growth factor and altered lipid metabolism. Cross-talk between glomerular and tubular compartments further amplifies injury: tubular epithelial cells secrete cytokines that sustain glomerular inflammation, while glomerular damage impairs tubular reabsorption. Emerging evidence highlights the role of extracellular vesicles in mediating intercellular communication, exemplified by exosome-borne TGF-β1 mRNA in the propagation of fibrosis. A deeper understanding of these mechanisms underpins the development of targeted therapies aimed at halting progression to end-stage renal disease.

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Molecular Mechanisms in Diabetic Kidney Disease publication trend

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Technical terms

Advanced glycation end-products (AGEs): Irreversible modifications of proteins or lipids by glucose, contributing to inflammation and fibrosis.

Podocyte: A specialised epithelial cell in the glomerulus that forms part of the filtration barrier via foot processes and slit diaphragms.

Glomerular filtration barrier: The tri-layered structure comprising endothelial cells, basement membrane and podocytes that filters blood plasma into urine.

Reactive oxygen species (ROS): Highly reactive molecules containing oxygen that can damage cellular components and trigger pro-inflammatory signalling.

Epithelial–mesenchymal transition (EMT): A process by which epithelial cells acquire mesenchymal characteristics, contributing to fibrosis.

Exosome: A small extracellular vesicle that mediates transfer of proteins, lipids and nucleic acids between cells.

References

1. Insulin growth factor axis and cardio-renal risk in diabetic kidney disease: an analysis from the CREDENCE trial. Cardiovascular Diabetology (2023).
2. Crosstalk between tubular epithelial cells and glomerular endothelial cells in diabetic kidney disease. Cell Proliferation (2020).
3. Molecular and Cellular Events Mediating Glomerular Podocyte Dysfunction and Depletion in Diabetes Mellitus. Frontiers in Endocrinology (2014).
4. Exosomes from high glucose-treated glomerular endothelial cells activate mesangial cells to promote renal fibrosis. Biology Open (2016).
5. High Glucose-induced O-GlcNAcylated Carbohydrate Response Element-binding Protein (ChREBP) Mediates Mesangial Cell Lipogenesis and Fibrosis THE POSSIBLE ROLE IN THE DEVELOPMENT OF DIABETIC NEPHROPATHY*. Journal of Biological Chemistry (2014).
6. Molecular Mechanisms in Early Diabetic Kidney Disease: Glomerular Endothelial Cell Dysfunction. International Journal of Molecular Sciences (2020).
7. The Phosphatidylinositol 3-Kinase/Akt Pathway Enhances Smad3-stimulated Mesangial Cell Collagen I Expression in Response to Transforming Growth Factor-β1*. Journal of Biological Chemistry (2003).
8. The Mechanism of Hyperglycemia-Induced Renal Cell Injury in Diabetic Nephropathy Disease: An Update. Life (2023).