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Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
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Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
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Imaging of Podocytic Proteins Nephrin, Actin, and Podocin with Expansion Microscopy
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Calcium regulates podocyte actin dynamics.

Anna Greka1, Peter Mundel

  • 1Division of Nephrology, Massachusetts General Hospital and Harvard Medical School, 149 13th St, Charlestown, MA 02129, USA. greka.anna@mgh.harvard.edu

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Calcium signaling dynamically regulates kidney podocyte actin cytoskeleton, crucial for kidney filter function. This process involves Rho GTPase pathways, important in cell motility and other cell types.

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Area of Science:

  • Nephrology
  • Cell Biology
  • Biochemistry

Background:

  • Kidney podocytes are specialized cells critical for the glomerular filtration barrier.
  • The actin cytoskeleton in podocyte foot processes (FPs) and the slit diaphragm (SD) maintain kidney filter function.
  • Disruptions in podocyte actin dynamics are linked to kidney diseases.

Purpose of the Study:

  • To explore the role of calcium (Ca2+) signaling in regulating podocyte actin cytoskeleton dynamics.
  • To investigate the involvement of Rho GTPase signaling pathways in podocyte actin remodeling.
  • To understand how these mechanisms are relevant in other cell types.

Main Methods:

  • Discusses calcium influx mediated by angiotensin and bradykinin.
  • Examines downstream Rho GTPase signaling pathways.
  • Compares podocyte mechanisms to those in fibroblasts and cancer cells.

Main Results:

  • Calcium influx modulates actin cytoskeleton remodeling in kidney podocytes.
  • Rho GTPase signaling pathways are key regulators of this dynamic process.
  • Similar calcium-mediated actin regulation pathways are observed in non-kidney cells.

Conclusions:

  • Dynamic regulation of the actin cytoskeleton by calcium and Rho GTPase signaling is essential for podocyte function and kidney filtration.
  • Podocytes serve as a valuable model for studying calcium signaling and actin dynamics.
  • These fundamental cellular processes are conserved across various cell types, including fibroblasts and cancer cells.