Evidence map›Paper›PMID 15545998›Full record

ArticleThe Journal of clinical investigation2004

Nephrin strands contribute to a porous slit diaphragm scaffold as revealed by electron tomography.

Jorma Wartiovaara, Lars-Göran Ofverstedt, Jamshid Khoshnoodi, Jingjing Zhang, Eetu Mäkelä, Sara Sandin, Vesa Ruotsalainen, R Holland Cheng, Hannu Jalanko, Ulf Skoglund and 1 more

Open access · bronzeAbstract readComparative Study
In one paragraph

Article in The Journal of clinical investigation, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 113 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
113citing papers in PubMed, 1 pooled it
9.1field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

113 citing papers in PubMed, 1 synthesis or guideline pooled it, 306 citations in OpenAlex.

  1. Pooled it
  2. Podocin oligomers regulate the ordering of nephrin chains, providing the molecular basis ofProceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  3. Article
  4. Review
  5. Review
  6. Review
  7. Mechanisms of podocyte injury in genetic kidney disease.Pediatric nephrology (Berlin, Germany) · 2025
    Review
  8. Article
  9. Article
  10. Review
  11. Article
  12. Article
  13. Review
  14. Article
  15. Article
  16. Article
  17. Article
  18. Article
  19. Article
  20. Review

53 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

11 authors at 3 institutions in 2 countries.

Jorma WartiovaaraInstitute of Biotechnology, University of Helsinki, Helsinki, Finland.
Lars-Göran Ofverstedt
Jamshid Khoshnoodi
Jingjing Zhang
Eetu Mäkelä
Sara Sandin
Vesa Ruotsalainen
R Holland Cheng
Hannu Jalanko
Ulf Skoglund
Karl Tryggvason
Karolinska Institutet · SEUniversity of Helsinki · FIUniversity of Oulu · FI

Funding

NEPHRIN AND KIDNEY FUNCTION AND DISEASER01DK054724 · NIDDK · KAROLINSKA INSTITUTE · PI TRYGGVASON, KARL · 1999 to 2001
$368k
NIDDK NIH HHS DK-54724
6 · The paper itself

Abstract

Nephrin is a key functional component of the slit diaphragm, the structurally unresolved molecular filter in renal glomerular capillaries. Abnormal nephrin or its absence results in severe proteinuria and loss of the slit diaphragm. The diaphragm is a thin extracellular membrane spanning the approximately 40-nm-wide filtration slit between podocyte foot processes covering the capillary surface. Using electron tomography, we show that the slit diaphragm comprises a network of winding molecular strands with pores the same size as or smaller than albumin molecules, as demonstrated in humans, rats, and mice. In the network, which is occasionally stratified, immunogold-nephrin antibodies labeled individually detectable globular cross strands, about 35 nm in length, lining the lateral elongated pores. The cross strands, emanating from both sides of the slit, contacted at the slit center but had free distal endings. Shorter strands associated with the cross strands were observed at their base. Immunolabeling of recombinant nephrin molecules on transfected cells and in vitrified solution corroborated the findings in kidney. Nephrin-deficient proteinuric patients with Finnish-type congenital nephrosis and nephrin-knockout mice had only narrow filtration slits that lacked the slit diaphragm network and the 35-nm-long strands but contained shorter molecular structures. The results suggest the direct involvement of nephrin molecules in constituting the macromolecule-retaining slit diaphragm and its pores.

Indexed as

AnimalsCapillariesCell LineDisulfidesGenetic VariationHumansImmunoglobulin GImmunohistochemistryKidney GlomerulusMembrane ProteinsMiceMice, Inbred C57BLMice, KnockoutProteinsProtein Structure, TertiaryRatsDisulfidesImmunoglobulin GMembrane ProteinsnephrinProteinsRecombinant Proteins

Identifiers

PMID15545998
PMCPMC525744
OpenAlexW2097300515

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.