Evidence map›Paper›PMID 33806395›Full record

ReviewInternational journal of molecular sciences2021

The History and Mystery of Alveolar Epithelial Type II Cells: Focus on Their Physiologic and Pathologic Role in Lung.

Barbara Ruaro, Francesco Salton, Luca Braga, Barbara Wade, Paola Confalonieri, Maria Concetta Volpe, Elisa Baratella, Serena Maiocchi, Marco Confalonieri

Open access · goldAbstract readReview
In one paragraph

Review in International journal of molecular sciences, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 170 papers.

0numbers the graph read from it
0cells of the map it votes in
170citing papers in PubMed
31.7field-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

170 citing papers in PubMed, 274 citations in OpenAlex.

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  15. Regulated Cell Death in Idiopathic Pulmonary Fibrosis.FASEB journal : official publication of the Federation of American Societies for Experimental Biology · 2026
    Review
  16. Review
  17. Advances in understanding mitophagy's role in lung injury.Chinese journal of traumatology = Zhonghua chuang shang za zhi · 2026
    Review
  18. Article
  19. Review
  20. Article

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

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

9 authors at 3 institutions in 1 country.

Barbara RuaroPulmonology Department, University Hospital of Cattinara, 34128 Trieste, Italy.ORCID 0000-0001-8990-859X
Francesco SaltonPulmonology Department, University Hospital of Cattinara, 34128 Trieste, Italy.ORCID 0000-0002-0864-9766
Luca BragaICGEB, Area Science Park, Padriciano, 34128 Trieste, Italy.ORCID 0000-0002-9827-6755
Barbara WadeCity of Health and Science of Turin, Department of Science of Public Health and Pediatrics, University of Torino, 34128 Trieste, Italy.
Paola ConfalonieriPulmonology Department, University Hospital of Cattinara, 34128 Trieste, Italy.
Maria Concetta VolpeLife Sciences Department, University of Trieste, 34128 Trieste, Italy.
Elisa BaratellaDepartment of Radiology, Department of Medicine, Surgery and Health Science, University of Trieste, 34128 Trieste, Italy.ORCID 0000-0002-1061-9507
Serena MaiocchiLife Sciences Department, University of Trieste, 34128 Trieste, Italy.
Marco ConfalonieriPulmonology Department, University Hospital of Cattinara, 34128 Trieste, Italy.ORCID 0000-0002-4791-768X
Ospedale di Cattinara · ITUniversity of Trieste · ITAREA Science Park · IT

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Alveolar type II (ATII) cells are a key structure of the distal lung epithelium, where they exert their innate immune response and serve as progenitors of alveolar type I (ATI) cells, contributing to alveolar epithelial repair and regeneration. In the healthy lung, ATII cells coordinate the host defense mechanisms, not only generating a restrictive alveolar epithelial barrier, but also orchestrating host defense mechanisms and secreting surfactant proteins, which are important in lung protection against pathogen exposure. Moreover, surfactant proteins help to maintain homeostasis in the distal lung and reduce surface tension at the pulmonary air-liquid interface, thereby preventing atelectasis and reducing the work of breathing. ATII cells may also contribute to the fibroproliferative reaction by secreting growth factors and proinflammatory molecules after damage. Indeed, various acute and chronic diseases are associated with intensive inflammation. These include oedema, acute respiratory distress syndrome, fibrosis and numerous interstitial lung diseases, and are characterized by hyperplastic ATII cells which are considered an essential part of the epithelialization process and, consequently, wound healing. The aim of this review is that of revising the physiologic and pathologic role ATII cells play in pulmonary diseases, as, despite what has been learnt in the last few decades of research, the origin, phenotypic regulation and crosstalk of these cells still remain, in part, a mystery.

Indexed as

Alveolar Epithelial CellsAnimalsCOVID-19HumansImmunity, InnateIonsLungLung DiseasesPulmonary Surfactant-Associated ProteinsRegenerationIonsPulmonary Surfactant-Associated Proteinsacute respiratory distress syndrome (ARDS)alveolar type II cellschronic obstructive pulmonary disease (COPD)COVID-19 diseaseepithelial cellsidiopathic pulmonary fibrosislung cancer

Identifiers

PMID33806395
PMCPMC7961977
OpenAlexW3134107866

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.