part of part of glomerular endothelial cell kidney capillary endothelial cell glomerular capillary endothelial cell KUPO:0001037 https://cellxgene.cziscience.com/cellguide/CL_1001005 The glomerular capillary endothelial cell comprises an intrinsic component of the glomerulus in the kidney. Glomeruli contain a network of capillaries where the first step of blood filtration takes place, with glomerular capillary endothelial cells acting as an integral part of this process. Unlike regular endothelial cells that line the vasculature, unique fenestrations (openings) characterize these cells, allowing for enhanced permeability and filtration efficacy. Together with the glomerular basement membrane and podocytes, the glomerular endothelial cells form the glomerular filtration barrier, which is responsible for blood filtration and therefore critical for removal of waste products, such as urea and creatinine, and excess substances, such as glucose and ions, from the bloodstream. The glomerular capillary endothelial cells' fenestrations permit the free flow of a variety of particles, barring larger, negatively charged proteins like serum albumin, enabling the formation of an ultrafiltrate. This ultrafiltrate is the primitive form of urine, which then passes through the proximal tubule for further processing and ultimately helps maintain systemic fluid and electrolyte balance. Moreover, the glomerular capillary endothelial cells are also believed to play a crucial role in renal pathologies. Any compromise to their structural integrity or functional performance can lead to kidney diseases, including but not limited to, diabetic nephropathy and glomerulonephritis. For instance, in diabetes, persistent hyperglycemia can injure these cells, leading to a compromised glomerular filtration barrier and proteinuria, indicating the loss of proteins in the urine. (This extended description was generated by ChatGPT and reviewed by the CellGuide team, who added references, and by the CL editors, who approved it for inclusion in CL. It may contain information that applies only to some subtypes and species, and so should not be considered definitional.) An endothelial cell that is part of the glomerular capillary of the kidney. https://cdn.humanatlas.io/digital-objects/2d-ftu/kidney-renal-corpuscle/v1.2/assets/2d-ftu-kidney-renal-corpuscle.png Homo sapiens glomerular capillary endothelium