Podocyte Charge Characteristics and Function

Introduction to Podocyte Charge

Podocytes are negatively charged, which is essential for their role in the glomerular filtration barrier, with pores of approximately 6 nm that prevent passage of plasma proteins 1
The negative charge of podocytes helps maintain the structural integrity of the glomerular filtration barrier by electrostatic repulsion of negatively charged proteins like albumin, and works in conjunction with the size-selective properties of the glomerular basement membrane to maintain proper filtration 1

In disease states like minimal change disease, the negative charge of podocytes can be disrupted, allowing larger structures up to 70 nm to pass through the barrier 1

Positively charged molecules can interact with the negatively charged podocyte membrane, similar to how positively charged nanosystems interact with negatively charged eukaryotic cell membranes 2
Arginine-rich cell-penetrating peptides can interact with negatively charged membrane lipids through electrostatic interactions and hydrogen bonding, and the guanidinium groups from arginine residues have strong affinity towards negatively charged lipids, which can affect membrane properties 3

The negative charge of podocytes must be considered when studying urine extracellular vesicles (uEVs), as these vesicles may originate from podocytes and retain their charge properties 4