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SPATIALLY PATTERNED PODOCYTE STATE TRANSITIONS COORDINATE AGING OF THE GLOMERULUS
Christopher Chaney1, Jeffrey W Pippin2, Uyen Tran3
1Department of Medicine, University of Texas Southwestern Medical Center, Dallas, Texas, United States.
Biorxiv : the Preprint Server for Biology
|March 18, 2026
Summary
Aging kidneys show region-specific changes, with podocytes in the juxtamedullary region aging selectively. This single nuclei transcriptomics study reveals coordinated podocyte aging, not universal degeneration, in the glomerulus.
Area of Science:
- Nephrology
- Gerontology
- Molecular Biology
Background:
- Chronic kidney diseases, including glomerular diseases, are increasing with an aging US population.
- The cellular mechanisms driving progressive glomerular disease and age-related glomerulosclerosis remain poorly understood.
Purpose of the Study:
- To investigate age- and region-specific cellular responses in the aging kidney glomerulus.
- To elucidate the molecular mechanisms underlying age-related decline in kidney function.
Main Methods:
- Single nuclei transcriptomics was performed on kidneys from young, middle-aged, and aged mice.
- Kidney tissues were dissected into outer cortex and juxta-medullary regions for analysis.
- A state-of-the-art pipeline was used to analyze age- and region-specific cellular responses.
Main Results:
- Transcriptomic analysis revealed regional differences in cell types, with Napsa identified as a juxta-medullary marker.
- Aging induced cell type-specific responses; aged podocytes showed downregulated canonical genes and upregulated inflammatory/senescent signatures.
- Senescent podocytes were concentrated in the juxta-medullary region, indicating heightened sensitivity, and aging appeared selective and coordinated, not a universal degeneration.
Conclusions:
- Single nuclei transcriptomics offers mechanistic insights into regional nephron susceptibility in aging kidneys.
- Future therapies for aging kidneys must account for the glomerulus's cellular and spatial complexity.
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