| Titre : |
Varied effects of tobacco smoke and e‑cigarette vapor suggest that nicotine does not affect endothelium‑dependent relaxation and nitric oxide signaling |
| Type de document : |
document électronique |
| Auteurs : |
Gerald Wölkart, Auteur ; Alexander Kollau, Auteur ; Michael Russwurm, Auteur ; Doris Koesling, Auteur ; Astrid Schrammel, Auteur ; Bernd Mayer, Auteur |
| Editeur : |
Lisbonne [Portugal] : Observatoire europeen des drogues et des toxicomanies = European Monitoring Centre for Drugs and Drug Addiction (EMCDDA) |
| Année de publication : |
2023 |
| Collection : |
EMCDDA Scientific report |
| Importance : |
14 p. |
| Présentation : |
tab., graph. |
| Langues : |
Anglais (eng) |
| Catégories : |
[TABAC] CANDIDATS:e-cigarette
[TABAC] chimie du tabac:constituant:alcaloïde:nicotine
[TABAC] tabagisme:pathologie:pathologie bucco-dentaire
[TABAC] tabagisme:tabagisme actif:fumeur
|
| Mots-clés : |
test sur animal |
| Index. décimale : |
TA 3.2.2.5 Pathologies cardiovasculaires |
| Résumé : |
Chronic smoking causes dysfunction of vascular endothelial cells, evident as a reduction of flowmediated dilation in smokers, but the role of nicotine is still controversial. Given the increasing use of e-cigarettes and other nicotine products, it appears essential to clarify this issue. We studied extracts
from cigarette smoke (CSE) and vapor from e-cigarettes (EVE) and heated tobacco (HTE) for their effects on vascular relaxation, endothelial nitric oxide signaling, and the activity of soluble guanylyl cyclase. The average nicotine concentrations of CSE, EVE, and HTE were 164, 800, and 85 μM,
respectively. At a dilution of 1:3, CSE almost entirely inhibited the relaxation of rat aortas and porcine coronary arteries to acetylcholine and bradykinin, respectively, while undiluted EVE, with a 15-fold higher nicotine concentration, had no significant effect. With about 50% inhibition at 1:2 dilution,
the effect of HTE was between CSE and EVE. Neither extract affected endothelium-independent relaxation to an NO donor. At the dilutions tested, CSE was not toxic to cultured endothelial cells but, in contrast to EVE, impaired NO signaling and inhibited NO stimulation of soluble guanylyl cyclase. Our results demonstrate that nicotine does not mediate the impaired endothelium-dependent vascular relaxation caused by smoking. |
| En ligne : |
https://doi.org/10.1038/s41598-023-42750-6 |
| Format de la ressource électronique : |
Article en ligne |
| Permalink : |
https://biblio.fares.be/opac_css/index.php?lvl=notice_display&id=10210 |
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