Parietal cells-new perspectives in glomerular disease.

Area of Science:

• Nephrology
• Cell Biology
• Pathology

Background:

• Parietal epithelial cells (PECs) line Bowman's capsule, with previously unknown functions beyond structural support.
• PECs, proximal tubular epithelial cells (PTECs), and podocytes share a common mesenchymal origin and differentiate during embryogenesis.
• While PTECs and podocytes have defined roles in filtration and transport, PEC functions were less understood.

Purpose of the Study:

• To review recent advances in understanding the role of PECs in glomerular regeneration and disease.
• To explore the molecular processes underlying PEC phenotypic changes and behavior.
• To highlight the therapeutic potential of targeting PECs in kidney diseases.

Main Methods:

• This review synthesizes current literature on PECs in glomerular health and disease.
• It examines molecular mechanisms driving PEC differentiation and function.
• Focus is placed on recent findings regarding PEC involvement in regeneration and sclerosis.

Main Results:

• PECs are now recognized as crucial in glomerular disease, potentially replacing lost podocytes.
• PECs contribute to extracapillary proliferative lesions and glomerulosclerosis.
• Molecular pathways governing PEC behavior in disease are increasingly understood.

Conclusions:

• PECs have significant roles in glomerular regeneration and disease pathogenesis.
• Understanding PEC molecular processes is key for developing targeted therapies.
• Therapeutic strategies could involve stimulating PECs' regenerative capacity or inhibiting their pro-sclerotic actions.