Overweight as a contribution factor for asthma in adolescents born with very low birth weight, and the increased level of leptin in overweight-related asthma
(English)Manuscript (preprint) (Other academic)
Obesity is a risk factor for asthma, but the mechanisms are unclear. Childhood-obesity is suggested to be the link between very low birth weight (VLBW) and chronic diseases in adults. Thus, we hypothesized that overweight was a contributing factor for asthma in adolescents born with VLBW, and that leptin and leptinassociated cytokines might play roles in overweight-related asthma. Seventy-four VLBW and 64 normal birth weight (NBW) children participated in a 12-year follow-up study assessing asthma and allergy. Twelve of the 74 VLBW and 15 of the 64 NBW children were overweight. The diagnosis of current asthma was made by pediatricians, and serum levels of leptin, IFN-γ, IL-4, IL-6 and TNF-α were analyzcd by ELISA. Overweight was an independent contributing factor for current asthma in children born with VLBW (OR 5.8, 95% CI 1.2-27). Leptin levels were higher in children with than without overweight (18.1 vs. 2.8 ng/mL, p < 0.001). In children with overweight, current asthmatics had somewhat higher levels of leptin than children without current asthma (30.8 vs. 14.3 ng/mL, p = 0.14), but this was not the case in children without overweight. lnterferon-y was more often detectable in children with than without overweight (60.9% vs. 12.4%, p < 0.001). There was a weak correlation between leptin and IFN-γ. However, the levels of IFN-γ, IL-4, IL-6 and TNF-a were similar in children with and without current asthma irrespective of overweight. Thus, overweight was a contributing factor for asthma in the VLBW children. Leptin and IFN-γ might be involved in asthma in the overweight children.
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-84613OAI: oai:DiVA.org:liu-84613DiVA: diva2:560699