Document Detail


Natural resistance, iron and infection: a challenge for clinical medicine.
MedLine Citation:
PMID:  16476787     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Natural resistance to infection, which does not depend on antibiotics, is a powerful protective mechanism common to all mankind that has been responsible for the survival of our species during countless millennia in the past. The normal functioning of this complex system of phagocytic cells and tissue fluids is entirely dependent on an extremely low level of free ionic iron (10(-18) M) in tissue fluids. This low-iron environment is maintained by the unsaturated iron-binding proteins transferrin and lactoferrin, which depend on well-oxygenated tissues, where a relatively high oxidation-reduction potential (Eh) and pH are essential for the binding of ferric iron. Freely available iron is derived from iron overload, free haem compounds, or hypoxia in injured tissue leading to a fall in Eh and pH. This can severely damage or abolish normal bactericidal mechanisms in tissue fluids leading to overwhelming growth of bacteria or fungi. The challenge for clinical medicine is to reduce or eliminate the presence of freely available iron in clinical disease. In injured or hypoxic tissue, treatment with hyperbaric oxygen might prove very useful by increasing tissue oxygenation and restoring normal bactericidal mechanisms in tissue fluids, which would be of huge benefit to the patient.
Authors:
John J Bullen; Henry J Rogers; Paul B Spalding; C Gillon Ward
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Publication Detail:
Type:  Journal Article; Review    
Journal Detail:
Title:  Journal of medical microbiology     Volume:  55     ISSN:  0022-2615     ISO Abbreviation:  J. Med. Microbiol.     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-02-14     Completed Date:  2006-04-04     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0224131     Medline TA:  J Med Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  251-8     Citation Subset:  IM    
Affiliation:
National Institute for Medical Research, Mill Hill, London NW7 1AA, UK. john.bullen@tiscali.fr
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MeSH Terms
Descriptor/Qualifier:
Animals
Bacteria / pathogenicity
Bacterial Infections / immunology*,  microbiology
Candida / pathogenicity
Candidiasis / immunology*,  microbiology
Guinea Pigs
Humans
Immunity, Innate*
Iron / metabolism*
Iron Overload
Chemical
Reg. No./Substance:
7439-89-6/Iron

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


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