Evidence map›Paper›PMID 34913352›Full record

ReviewPhysiological research2021

Alveolar type II cells and pulmonary surfactant in COVID-19 era.

A Calkovska, M Kolomaznik, V Calkovsky

Open access · goldAbstract readReview
In one paragraph

Review in Physiological research, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
30citing papers in PubMed, 2 pooled it
10.0field-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

30 citing papers in PubMed, 2 syntheses or guidelines pooled it, 56 citations in OpenAlex.

  1. Pooled it
  2. Pooled it
  3. Trial
  4. Review
  5. Article
  6. The importance of mechanical forces in chronic respiratory diseases.European respiratory review : an official journal of the European Respiratory Society · 2026
    Review
  7. Article
  8. Article
  9. A therapy for suppressing canonical and noncanonical SARS-CoV-2 viral entry and an intrinsic intrapulmonary inflammatory response.Proceedings of the National Academy of Sciences of the United States of America · 2024
    Article
  10. Review
  11. Article
  12. Article
  13. Article
  14. Review
  15. COVID-19: a multi-organ perspective.Frontiers in cellular and infection microbiology · 2024
    Review
  16. Cytokine production in anFrontiers in immunology · 2024
    Article
  17. Review
  18. Review
  19. Article
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 1 institution in 1 country.

A CalkovskaDepartment of Physiology, Jessenius Faculty of Medicine in Martin, Comenius University in Bratislava, Martin, Slovak Republic; Clinic of Otorhinolaryngology and Head and Neck Surgery, Jessenius Faculty of Medicine, Comenius University, University Hospital Martin, Martin, Slovak Republic. vladimir.calkovsky@uniba.sk.
M Kolomaznik
V Calkovsky
Comenius University Bratislava · SK

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

In this review, we discuss the role of pulmonary surfactant in the host defense against respiratory pathogens, including novel coronavirus SARS-CoV-2. In the lower respiratory system, the virus uses angiotensin-converting enzyme 2 (ACE2) receptor in conjunction with serine protease TMPRSS2, expressed by alveolar type II (ATII) cells as one of the SARS-CoV-2 target cells, to enter. ATII cells are the main source of surfactant. After their infection and the resulting damage, the consequences may be severe and may include injury to the alveolar-capillary barrier, lung edema, inflammation, ineffective gas exchange, impaired lung mechanics and reduced oxygenation, which resembles acute respiratory distress syndrome (ARDS) of other etiology. The aim of this review is to highlight the key role of ATII cells and reduced surfactant in the pathogenesis of the respiratory form of COVID-19 and to emphasize the rational basis for exogenous surfactant therapy in COVID-19 ARDS patients.

Indexed as

Alveolar Epithelial CellsAngiotensin-Converting Enzyme 2AnimalsCOVID-19COVID-19 Drug TreatmentHost-Pathogen InteractionsHumansLungPulmonary Surfactant-Associated ProteinsPulmonary SurfactantsReceptors, VirusSARS-CoV-2Serine EndopeptidasesVirus InternalizationACE2 protein, humanAngiotensin-Converting Enzyme 2Pulmonary Surfactant-Associated ProteinsPulmonary SurfactantsReceptors, VirusSerine EndopeptidasesTMPRSS2 protein, human

Identifiers

PMID34913352
PMCPMC8884364
OpenAlexW4200182394

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.