Leptin and asthma in overweight children at 12 years of age
2004 (English)In: Pediatric Allergy and Immunology, ISSN 0905-6157, Vol. 15, no 6, 523-530 p.Article in journal (Refereed) Published
Obesity is suggested as a risk factor for asthma, but the mechanisms are unclear. The relationship between obesity and asthma has not been considered in children born with very low-birth weight (VLBW). We hypothesized that overweight was a contributing factor for asthma in VLBW children, and that leptin and leptin-associated cytokines might play roles in overweight-related asthma. Seventy-four VLBW and 64 normal birth weight (NBW) children participated in a 12-yr follow up study assessing asthma and allergy. Twenty-seven (12 VLBW) of the 138 children were overweight according to the proposed international definition. The diagnosis of current asthma was made by a pediatrician. Serum levels of leptin and interferon (IFN)-γ were analyzed by enzyme-linked immunosorbent assay (ELISA). Leptin levels were considerably higher in the overweight than in the non-overweight children (median value: 18.1 vs. 2.8 ng/ml, p < 0.001). In the overweight children, current asthmatics had twice as high levels of leptin as children without current asthma (median value: 30.8 vs. 14.3 ng/ml, p = 0.14), but this was not the case in the non-overweight children. IFN-γ was more often detected in the overweight than in the non-overweight children (61% vs. 12%, p < 0.001), and there was a positive correlation between the levels of leptin and the levels of IFN-γ (Rho = 0.40, p < 0.001). In the VLBW group, the overweight children had a significantly increased risk for current asthma compared with the non-overweight children after adjustment for the neonatal risk factors [adjusted odds ratio (OR) 5.8, 95% confidence interval (CI): 1.2-27]. Thus, overweight was associated with asthma in the VLBW children. Our hypothesis remained that leptin might be involved in the pathogenesis of asthma in the overweight children, and IFN-γ might be a pathway in the process of leptin-induced inflammation.
Place, publisher, year, edition, pages
2004. Vol. 15, no 6, 523-530 p.
astma, cytokines, infant, very low-birth weight, leptin. overweight
National CategoryMedical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-23697DOI: 10.1111/j.1399-3038.2004.00195.xLocal ID: 3197OAI: oai:DiVA.org:liu-23697DiVA: diva2:244012