Podocytes: Key Effectors of Glomerular Permeability and Structural Integrity

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Abstract
Podocytes are specialized epithelial cells that play a crucial role in maintaining the structure and function of the glomerular filtration barrier (GFB). Their unique morphology, characterized by interdigitating foot processes connected by slit diaphragms, allows for precise size and charge selectivity during filtration. The slit diaphragm, composed primarily of nephrin, podocin, and CD2AP, forms a mechanosensitive signaling platform that links the plasma membrane to the actin cytoskeleton, ensuring both mechanical resilience and dynamic adaptability to hemodynamic stress. Podocytes integrate biomechanical, metabolic, and paracrine cues through pathways such as the PI3K/Akt, Rho GTPase, and integrin pathways, thereby coordinating cytoskeletal remodeling, adhesion, and survival. Disruption of these networks—whether due to genetic mutations, oxidative stress, hyperglycemia, or immune injury—leads to foot process effacement, loss of slit diaphragm integrity, and the onset of proteinuria. Persistent podocyte injury contributes to glomerulosclerosis and progressive chronic kidney disease. Emerging evidence suggests that targeting podocyte-specific pathways, including TRPC6, Piezo1, and epigenetic modulators, may preserve filtration barrier integrity. Various immunosuppressive treatments have proven to be effective in modulating the structure and function of the podocyte.

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