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Related Experiment Video

Updated: May 30, 2026

Glomerular Outgrowth as an Ex Vivo Assay to Analyze Pathways Involved in Parietal Epithelial Cell Activation

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Published on: August 19, 2020

Focal and segmental glomerulosclerosis: multiple pathways are involved.

Alain Meyrier¹

¹Service de Néphrologie, Hôpital Georges Pompidou, Paris, France. alain.meyrier@gmail.com

Seminars in Nephrology

|August 16, 2011

Summary

Focal segmental glomerulosclerosis (FSGS) is a kidney condition involving podocyte injury. Research suggests FSGS is not autoimmune, and treatments may work by protecting podocytes and reducing proteinuria.

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Published on: June 30, 2018

Area of Science:

Nephrology
Pathology
Molecular Biology

Background:

Focal segmental glomerulosclerosis (FSGS) is a clinicopathologic entity, not a distinct disease, characterized by varied presentations.
The term FSGS is a misnomer, as lesions are not consistently focal, segmental, or sclerotic, and clinical manifestations are nonspecific.
Podocyte injury is central to FSGS, acting as the initial culprit or victim in multiple pathogenic processes.

Purpose of the Study:

To reframe FSGS research by focusing on the podocyte as the central element.
To explore the diverse causes of FSGS, including secondary and genetic forms.
To re-evaluate the mechanisms of action for current FSGS treatments.

Main Methods:

Review of existing human glomerulopathy data.
Analysis of findings from animal and cell culture models of FSGS.
Synthesis of recent research on podocyte biology and slit diaphragm function.

Main Results:

Identified secondary causes of FSGS in human diseases and models.
Highlighted genetic forms of FSGS, elucidating slit diaphragm architecture and steroid resistance.
Proposed that FSGS may not be a T-cell-driven autoimmune condition.

Conclusions:

FSGS pathogenesis involves diverse factors affecting the podocyte and slit diaphragm.
Genetic FSGS provides insights into podocyte dysfunction and treatment resistance.
Current treatments like glucocorticoids and calcineurin inhibitors may act primarily on podocytes, functioning as antiproteinuric agents rather than solely immunosuppressors.