Document Detail


Secondhand tobacco smoke, arterial stiffness, and altered circadian blood pressure patterns are associated with lung inflammation and oxidative stress in rats.
MedLine Citation:
PMID:  22140051     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Chronic smoking and secondhand tobacco smoke exposure are major risk factors for cardiovascular disease that are known to adversely alter the structural and mechanical properties of arteries. The objective of this study was to determine the effects of subchronic secondhand tobacco smoke exposure on circadian blood pressure patterns, arterial stiffness, and possible sources of oxidative stress in conscious, unsedated radiotelemetry-implanted rats. Pulse wave change in pressure over time (dP/dt) was used an indicator of arterial stiffness and was compared with both structural (wall thickness) and functional (nitric oxide production and bioactivity and endothelin-1 levels) features of the arterial wall. In addition, histology of lung, heart, and liver was examined as well as pulmonary and hepatic detoxifying enzyme activity (cytochrome P450, specifically CYP1A1). Subchronic secondhand tobacco smoke exposure altered the circadian pattern of heart rate and blood pressure, with a loss in the normal dipping pattern of blood pressure during sleep. Secondhand tobacco smoke exposure also increased pulse wave dP/dt in the absence of any structural modifications in the arterial wall. Furthermore, although nitric oxide production and endothelin-1 levels were not altered by secondhand tobacco smoke, there was increased inactivation of nitric oxide as indicated by peroxynitrite production. Increased lung neutrophils or pulmonary CYP1A1 may be responsible for the increase in oxidative stress in rats exposed to secondhand tobacco smoke. In turn, this may be related to the observed failure of blood pressure to dip during periods of sleep and a possible increase in arterial stiffness.
Authors:
Nicole J Gentner; Lynn P Weber
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-12-02
Journal Detail:
Title:  American journal of physiology. Heart and circulatory physiology     Volume:  302     ISSN:  1522-1539     ISO Abbreviation:  Am. J. Physiol. Heart Circ. Physiol.     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-02-01     Completed Date:  2012-03-20     Revised Date:  2012-05-23    
Medline Journal Info:
Nlm Unique ID:  100901228     Medline TA:  Am J Physiol Heart Circ Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  H818-25     Citation Subset:  IM    
Affiliation:
Toxicology Graduate Program, University of Saskatchewan, Saskatoon,Saskatchewan, Canada.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure / physiology*
Circadian Rhythm / physiology*
Endothelium, Vascular / physiopathology
Male
Nitrates / blood
Nitric Oxide / blood
Nitrites / blood
Oxidative Stress / physiology*
Pneumonia / epidemiology,  physiopathology*
Rats
Rats, Sprague-Dawley
Risk Factors
Tobacco Smoke Pollution / adverse effects*,  statistics & numerical data
Vascular Diseases / epidemiology,  physiopathology
Vascular Stiffness / physiology*
Chemical
Reg. No./Substance:
0/Nitrates; 0/Nitrites; 0/Tobacco Smoke Pollution; 10102-43-9/Nitric Oxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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