Evidence map›Paper›PMID 21498777›Full record

ReviewAmerican journal of physiology. Heart and circulatory physiology2011

Carbon monoxide as an endogenous vascular modulator.

Charles W Leffler, Helena Parfenova, Jonathan H Jaggar

Open access · greenAbstract readReview
In one paragraph

Review in American journal of physiology. Heart and circulatory physiology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 77 papers.

0numbers the graph read from it
0cells of the map it votes in
77citing papers in PubMed
9.6field-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

77 citing papers in PubMed, 174 citations in OpenAlex.

  1. Review
  2. Review
  3. Review
  4. Article
  5. Article
  6. Review
  7. The machinery of healthy vasodilatation: an overview.Pflugers Archiv : European journal of physiology · 2025
    Review
  8. Review
  9. Article
  10. Article
  11. Observational
  12. Impact of aging on vascular ion channels: perspectives and knowledge gaps across major organ systems.American journal of physiology. Heart and circulatory physiology · 2023
    Review
  13. Review
  14. Review
  15. Article
  16. Article
  17. Review
  18. Article
  19. When the Blood Hits Your Brain: The Neurotoxicity of Extravasated Blood.International journal of molecular sciences · 2021
    Review
  20. Review

17 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

3 authors at 1 institution in 1 country.

Charles W LefflerDept. of Physiology, 894 Union Ave., Memphis, TN 38163, USA. cleffler@uthsc.edu
Helena Parfenova
Jonathan H Jaggar
University of Tennessee Health Science Center · US

Funding

Cerebrovascular Stress and Circulating Endothelial CellsR01NS063936 · NINDS · UNIVERSITY OF TENNESSEE HEALTH SCI CTR · PI PARFENOVA, HELENA · 2010 to 2014
$1.6M
Heme oxygenase and cerebral vascular injuryR01HL099655 · NHLBI · UNIVERSITY OF TENNESSEE HEALTH SCI CTR · PI PARFENOVA, HELENA · 2010 to 2013
$1.5M
Heme oxygenase and cerebral vascular injuryR01NS046385 · NINDS · UNIVERSITY OF TENNESSEE HEALTH SCI CTR · PI PARFENOVA, HELENA · 2004 to 2008
$1.2M
NHLBI NIH HHS R01 HL099655NINDS NIH HHS R01 NS046385NINDS NIH HHS R01 NS063936
6 · The paper itself

Abstract

Carbon monoxide (CO) is produced by heme oxygenase (HO)-catalyzed heme degradation to CO, iron, and biliverdin. HO has two active isoforms, HO-1 (inducible) and HO-2 (constitutive). HO-2, but not HO-1, is highly expressed in endothelial and smooth muscle cells and in adjacent astrocytes in the brain. HO-1 is expressed basally only in the spleen and liver but can be induced to a varying extent in most tissues. Elevating heme, protein phosphorylation, Ca(2+) influx, and Ca(2+)/calmodulin-dependent processes increase HO-2 activity. CO dilates cerebral arterioles and may constrict or dilate skeletal muscle and renal arterioles. Selected vasodilatory stimuli, including seizures, glutamatergic stimulation, hypoxia, hypotension, and ADP, increase CO, and the inhibition of HO attenuates the dilation to these stimuli. Astrocytic HO-2-derived CO causes glutamatergic dilation of pial arterioles. CO dilates by activating smooth muscle cell large-conductance Ca(2+)-activated K(+) (BK(Ca)) channels. CO binds to BK(Ca) channel-bound heme, leading to an increase in Ca(2+) sparks-to-BK(Ca) channel coupling. Also, CO may bind directly to the BK(Ca) channel at several locations. Endothelial nitric oxide and prostacyclin interact with HO/CO in circulatory regulation. In cerebral arterioles in vivo, in contrast to dilation to acute CO, a prolonged exposure of cerebral arterioles to elevated CO produces progressive constriction by inhibiting nitric oxide synthase. The HO/CO system is highly protective to the vasculature. CO suppresses apoptosis and inhibits components of endogenous oxidant-generating pathways. Bilirubin is a potent reactive oxygen species scavenger. Still many questions remain about the physiology and biochemistry of HO/CO in the circulatory system and about the function and dysfunction of this gaseous mediator system.

Indexed as

Cardiovascular Physiological PhenomenaAnimalsBlood VesselsCarbon MonoxideCerebrovascular CirculationGene Expression Regulation, EnzymologicHeme Oxygenase-1Heme Oxygenase (Decyclizing)HumansVasodilationCarbon MonoxideHeme Oxygenase-1heme oxygenase-2Heme Oxygenase (Decyclizing)

Identifiers

PMID21498777
PMCPMC3129910
OpenAlexW2121769128

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.