Document Detail

Microbial exposure of rural school children, as assessed by levels of N-acetyl-muramic acid in mattress dust, and its association with respiratory health.
MedLine Citation:
PMID:  15131567     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Endotoxin exposure has been shown to be associated with a decreased prevalence of atopic sensitization and symptoms. Yet endotoxin represents only a part of the indoor microbial exposure. Muramic acid, a constituent of peptidoglycan, is present in gram-negative and gram-positive bacteria in the environment and may therefore serve as an additional marker of microbial exposure. OBJECTIVE: To study the factors determining the level of indoor exposure to muramic acid/peptidoglycan, as well as its potential association with respiratory health. METHODS: In 553 farm and nonfarm school children from Austria, Switzerland, and Germany, mattress dust muramic acid concentrations were determined, and health was assessed by using IgE measurements and questionnaire information. RESULTS: The muramic acid concentration was found to be significantly higher in dust from farm children's mattresses than in dust from nonfarm children's mattresses (157 vs 131 ng/mg). Children with higher mattress dust muramic acid concentrations had a significantly lower prevalence of wheezing (odds ratio of highest vs lowest tertile of muramic acid concentration, 0.3; 95% CI, 0.1-0.9), regardless of farming status and endotoxin exposure. The association for asthma was similar, and no association was found with atopic sensitization. CONCLUSION: Next to endotoxin, muramic acid provides us with an independent marker of microbial exposure. Unlike endotoxin, muramic acid was inversely associated with wheezing rather than with atopic sensitization.
Robert Theodoor van Strien; Regina Engel; Otto Holst; Albrecht Bufe; Waltraud Eder; Marco Waser; Charlotte Braun-Fahrländer; Josef Riedler; Dennis Nowak; Erika von Mutius;
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of allergy and clinical immunology     Volume:  113     ISSN:  0091-6749     ISO Abbreviation:  J. Allergy Clin. Immunol.     Publication Date:  2004 May 
Date Detail:
Created Date:  2004-05-07     Completed Date:  2004-06-17     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  1275002     Medline TA:  J Allergy Clin Immunol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  860-7     Citation Subset:  AIM; IM    
University Children's Hospital, Lindwurmstrasse 4, 80337 Munich, Germany.
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MeSH Terms
Asthma / etiology
Bedding and Linens / adverse effects*,  microbiology*
Dust / analysis
Endotoxins / analysis
Environmental Microbiology*
Immunoglobulin E / blood
Muramic Acids / analysis*
Rhinitis, Allergic, Seasonal / etiology
Rural Health*
Reg. No./Substance:
0/Dust; 0/Endotoxins; 0/Muramic Acids; 1856-93-5/N-acetylmuramic acid; 37341-29-0/Immunoglobulin E

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