Cited by 94Renal Diseases and GlomerulopathiesEndoplasmic Reticulum Stress and DiseaseComplement system in diseases

Evidence for activation of the unfolded protein response in collagen IV nephropathies

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Pieri, Myrtani, Stefanou, Charalambos, Zaravinos, Apostolos, Erguler, Kamil, Stylianou, Kostas, Lapathitis, George, Karaiskos, Christos, Savva, Isavella +11 more·2014·Journal of the American Society of Nephrology

Abstract

Thin-basement-membrane nephropathy (TBMN) and Alport syndrome (AS) are progressive collagen IV nephropathies caused by mutations in COL4A3/A4/A5 genes. These nephropathies invariably present with microscopic hematuria and frequently progress to proteinuria and CKD or ESRD during long-term follow-up. Nonetheless, the exact molecular mechanisms by which these mutations exert their deleterious effects on the glomerulus remain elusive. We hypothesized that defective trafficking of the COL4A3 chain causes a strong intracellular effect on the cell responsible for COL4A3 expression, the podocyte. To this end, we overexpressed normal and mutant COL4A3 chains (G1334E mutation) in human undifferentiated podocytes and tested their effects in various intracellular pathways using a microarray approach. COL4A3 overexpression in the podocyte caused chain retention in the endoplasmic reticulum (ER) that was associated with activation of unfolded protein response (UPR)-related markers of ER stress. Notably, the overexpression of normal or mutant COL4A3 chains differentially activated the UPR pathway. Similar results were observed in a novel knockin mouse carrying the Col4a3-G1332E mutation, which produced a phenotype consistent with AS, and in biopsy specimens from patients with TBMN carrying a heterozygous COL4A3-G1334E mutation. These results suggest that ER stress arising from defective localization of collagen IV chains in human podocytes contributes to the pathogenesis of TBMN and AS through activation of the UPR, a finding that may pave the way for novel therapeutic interventions for a variety of collagenopathies.

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Crossref · 10.1681/asn.2012121217

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Authors
Pieri, M., Stefanou, C., Zaravinos, A., Erguler, K., Stylianou, K., Lapathitis, G., Karaiskos, C., Savva, I., Paraskeva, R., Dweep, H., Sticht, C., Anastasiadou, N., Zouvani, I., Goumenos, D., Felekkis, K., Saleem, M., Voskarides, K., Gretz, N., & Deltas, C.
Affiliations
  • University of Cyprus (CY)
  • University Hospital of Heraklion (GR)
  • Cyprus Institute of Neurology and Genetics (CY)
  • Heidelberg University (DE)
  • Nicosia General Hospital (CY)
  • University of Patras (GR)
  • Southmead Hospital (GB)
Corresponding author
  • Pieri, Myrtani
  • Stefanou, Charalambos
  • Zaravinos, Apostolos
  • Erguler, Kamil
  • Savva, Isavella
  • Paraskeva, Revekka
  • Voskarides, Konstantinos
  • Deltas, Constantinos
Venue
Journal of the American Society of Nephrology
Published
2014-02
Volume
25
Issue
2
Pages
260-275
ISSN
1046-6673 (ISSN-L)
OpenAlex
W2131355460
Cited by
94
References
43
Citations by year
2026: 6 · 2025: 7 · 2024: 9 · 2023: 5 · 2022: 9 · 2021: 7 · 2020: 7 · 2019: 7 · 2018: 14 · 2017: 6 · 2016: 4 · 2015: 6 · 2014: 7
FWCI
4.29
Type
journal article
Language
en
Open access
Locations
  • Journal of the American Society of Nephrology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Bristol Research (University of Bristol) (publishedVersion)
  • Explore Bristol Research (submittedVersion)
Topics
  • Health Sciences › Medicine › Nephrology › Renal Diseases and Glomerulopathies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Endoplasmic Reticulum Stress and Disease
  • Life Sciences › Immunology and Microbiology › Immunology › Complement system in diseases
Keywords
unfolded protein response, endoplasmic reticulum stress, thin basement membrane nephropathy, Alport syndrome, COL4A3, podocytes, endoplasmic reticulum, knockin mouse model, collagenopathies, glomerular disease pathogenesis
MeSH terms
Regulatory Factor X Transcription Factors, Endoplasmic Reticulum Chaperone BiP, Animals, Autoantigens, Biopsy, Cells, Cultured, Disease Models, Animal, DNA-Binding Proteins, Heat-Shock Proteins, Heterozygote, Humans, Kidney, Nephritis, Hereditary, Recombinant Fusion Proteins, Transcription Factors, Transfection, Point Mutation, Mutation, Missense, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling, Protein Transport, Collagen Type IV, RNA Interference, RNA, Small Interfering, Protein Array Analysis, Podocytes, Glomerular Basement Membrane, Mice, Gene Knock-In Techniques, Unfolded Protein Response, Endoplasmic Reticulum Stress

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