Glomerular epithelial cell differentiation and aberration evaluated using PAX8 and WT1 immunostains.

Document Type

Article

Publication Date

1-1-2026

Publication Title

Ultrastructural pathology

Abstract

Paired box 8 (PAX8) and Wilms' tumor 1 (WT1) of cap mesenchyme play important roles in tubular epithelial transition and podocyte maturation of the kidney. Parietal epithelial cells (PEC) progenitors demonstrate activity of these two factors in mature glomeruli. PECs can be activated into spindle cell crescents in crescentic glomerulonephritis (CreGN) or into podocyte hyperplasia in collapsing glomerulopathy (ColGN) based on histologic evidence. The study aimed to use PAX8 and WT1 stains to demonstrate the two transitional processes of mesonephros/metanephros and aberrant in CreGN, and ColGN. Immunohistochemical (IHC) stains for both PAX8 and WT1 were performed in fetal mesonephros/metanephros, adult negative controls, CreGN, and ColGN. Expressive patterns of PAX8 and WT1 in mesonephros/early fetal kidneys, adult kidneys, and aberrant glomerular changes were evaluated. PAX8 showed continuous nuclear expression in the parietal epithelium of mesonephros/metanephros, adult kidneys, & primordial podocytes, and consistent positivity in all renal tubules. WT1 showed strong nuclear and cytoplasmic expression within mature podocytes at all stages, despite some staining of WT1 in parietal epithelium. Cellular crescents and hyperplastic podocytes were strongly positive for PAX8, and only weakly positive in the nuclei of WT1. Our data support that PAX8

Volume

50

Issue

1

First Page

82

Last Page

91

DOI

10.1080/01913123.2025.2594992

ISSN

1521-0758

PubMed ID

41313003

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