Cellular Physiology and Biochemistry· 2013Q3
Short-Term Effects of Nose-Only Cigarette Smoke Exposure on Glutathione Redox Homeostasis, Cytochrome P450 1A1/2 and Respiratory Enzyme Activities in Mice Tissues
- 47,290citations
- Q3SCImago
- 2013year
Short summary
Four days of nose-only cigarette smoke exposure in mice significantly increased oxidative stress and disrupted mitochondrial function across liver, kidney, heart, and lung tissues, with lung and heart being particularly affected.
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Key points
- Four days of cigarette smoke exposure increased reactive oxygen species (ROS) and altered glutathione metabolism in mouse liver, kidney, heart, and lung.
- Lung and heart tissues were identified as primary targets of cigarette smoke-induced oxidative stress.
- Exposure led to increased expression and activity of Cytochrome P450 1A1 and 1A2 enzymes.
- Mitochondrial respiratory function was impaired, evidenced by altered activities of Complex I and IV enzymes.
AI-generated from the title and abstract; the full text is not read.
Abstract
BACKGROUND/AIMS: The components of cigarette smoke (CS) have been implicated in the development of cancer as well as in cardiopulmonary diseases. We have previously reported increased oxidative stress in rat tissues induced by tobacco-specific toxins nicotine and 4-(N-methyl-N-nitrosamino)-1-(3-pyridyl)-1-butanone (NNK). Recently, we have also shown increased oxidative stress and associated inflammatory responses in various tissues after exposure to cigarette smoke. METHODS: In this study, we have further investigated the effects of nose-only cigarette smoke exposure on mitochondrial functions and glutathione-dependent redox metabolism in tissues of BALB/C mice. Liver, kidney, heart and lung tissues were analyzed for oxidative stress, glutathione (GSH) and cytochrome P450 dependent enzyme activities and mitochondrial functions after exposure to smoke generated by 9 cigarettes/day for 4 days. Control mice were exposed to air only. RESULTS: An increase in oxidative stress as observed by increased production of reactive oxygen species (ROS) and altered GSH metabolism was apparent in all the tissues, but lung and heart appeared to be the main targets. Increased expression and activity of CYP450 1A1 and 1A2 were also observed in the tissues after exposure to cigarette smoke. Mitochondrial respiratory dysfunction in the tissues, as observed by alterations in the activities of Complex I and IV enzymes, was also observed after exposure to cigarette smoke. SDS-PAGE and Western blot results also indicate that alterations in the expression of enzyme proteins were in accordance with the changes in their catalytic functions. CONCLUSION: These results suggest that even short term exposure of cigarette smoke have adverse effects on mitochondrial functions and redox homeostasis in tissues which may progress to further complications associated with chronic smoking.
The authors' abstract, as published at the source. Cellular Physiology and Biochemistry, 2013 · DOI ↗
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Field: Physiology
PhysiologyMedicine