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Tobacco-borne siderophoric activity
1Department of Laboratory Medicine and Pathology, University of Minnesota Medical School, Minneapolis 55455.
Archives of Biochemistry and Biophysics
|November 15, 1989
Summary
Cigarette smoke contains substances that can transfer iron into cells, potentially explaining smoking-related lung inflammation and cancer. This tobacco-borne iron transfer activity is a key finding for understanding smoking
Area of Science:
- Environmental Health
- Toxicology
- Biochemistry
Background:
- Cigarette smoking is linked to inflammation and cancer.
- Smokers' lungs have high iron levels, and iron promotes inflammation.
- Iron and asbestos synergistically cause lung cancer via DNA damage.
Purpose of the Study:
- To investigate if tobacco smoke contains substances that can "delocalize" iron.
- To determine if these substances can transfer iron into cells.
Main Methods:
- Organic extracts of smoke and tobacco were used to test iron transfer.
- Iron reduction by smoke components was assessed.
- Iron leaching from asbestos and iron uptake by human red blood cells were measured.
Main Results:
- Substances in tobacco smoke extracts transfer iron from aqueous to organic phases.
- Iron transfer is dependent on prior reduction and iron concentration.
- Smoke condensates leach iron from asbestos and cause intracellular iron accumulation in red blood cells.
Conclusions:
- Tobacco smoke possesses siderophoric activity, facilitating iron transfer.
- This activity may contribute to smoking-induced pulmonary inflammation and neoplasia.