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Increased IL-4 mRNA expression and poly-aromatic hydrocarbon concentrations from children with asthma.

Authors: Al-Daghri, NM  Abd-Alrahman, S  Draz, H  Alkharfy, K  Mohammed, AK  Clerici, MS  Alokail, MS 
Citation: Al-Daghri NM, etal., BMC Pediatr. 2014 Jan 23;14:17. doi: 10.1186/1471-2431-14-17.
Pubmed: (View Article at PubMed) PMID:24450480
DOI: Full-text: DOI:10.1186/1471-2431-14-17

BACKGROUND: Asthma is the most common chronic childhood disease. Imbalance of cytokines released from T helper cells and environmental factors, such as exposure to poly-aromatic hydrocarbon (PAH), play pivotal roles in the pathogenesis of asthma. The aim of this study was to compare the mRNA expression patterns of Interleukin (IL)-4, interferon (IFN)-gamma and Acyl Co A long chain 3 (ACSL3) in peripheral blood leukocytes of children with and without asthma. To correlate the obtained mRNA data with serum IL-4, IFN-gamma and PAH levels. Further, to determine the effect of in vivo exposure to PAH on mRNA expression of IL-4, IFN-gamma and ACSL3 genes in a rat model. METHODS: A total of 170 children below 16 years (85 pediatric asthma patients and 85 matched healthy controls) were randomly selected from the Riyadh Cohort, Saudi Arabia. Gene expression analysis was performed using qRTPCR. Serum IL-4, IFN-gamma and PAH were measured using LINCOplex (human multiplex immunoassay kit) and HPLC respectively. RESULTS: IL-4 mRNA expression was significantly increased (P < 0.05) in children with asthma compared to healthy control group whereas no differences were observed for either IFN-gamma or ACSL3 mRNA. Similarly, serum IL- 4 and PAHs concentration was significantly higher as well in children with asthma in whom IFN-gamma was also significantly lower. Results obtained in rats showed that exposure to the benzopyrene prototype PAH resulted in a 2.6 fold (P < 0.001) increased IL-4 mRNA expression in blood. CONCLUSION: Peripheral blood IL-4 mRNA levels, serum concentration of this cytokine are elevated in children with asthma. Also, elevated levels of PAH were observed in children with asthma. Additionally, PAH administration in rodents resulted in an increased IL-4 mRNA which is supposed to partly mediate the inflammatory response noted in asthma.


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CRRD Object Information
CRRD ID: 10402791
Created: 2015-10-29
Species: All species
Last Modified: 2015-10-29
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.