Prenatal factors and the development of asthma
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Published on: August 7, 2017
1Division of Allergy and Immunology, Children's Memorial Hospital, Chicago, Illinois, USA. rkumar@childrensmemorial.org
Insights
Prenatal exposures like tobacco smoke and vitamin D levels significantly impact allergic diseases and early respiratory issues. Further research is needed to understand the mechanisms behind these early-life influences on childhood asthma.
Area of Science:
- Environmental influences on health
- Pediatric respiratory diseases
- Allergic disease development
Background:
- Prenatal and perinatal events are increasingly recognized as critical factors influencing allergic diseases and early-life respiratory morbidity.
- Understanding these early-life exposures is crucial for preventing chronic respiratory conditions.
Purpose of the Study:
- To review recent findings on prenatal exposures and their impact on allergic diseases and early-life respiratory health.
- To explore potential mechanisms linking in-utero exposures to respiratory outcomes.
Main Methods:
- Review of recent scientific literature and cohort studies published within the last year.
- Analysis of epidemiological data on prenatal exposures and their correlation with respiratory and allergic outcomes.
Main Results:
- In-utero exposures such as tobacco smoke, vitamin D levels, and prenatal infections modulate atopy and respiratory disease.
- Gene-environment interactions, particularly with inflammatory pathway genes and smoke exposure, have been identified.
- Prenatal endotoxin exposure may be protective, while chorioamnionitis combined with preterm birth may increase wheezing risk.
Conclusions:
- Epidemiological evidence strongly supports multiple prenatal factors influencing early-life respiratory morbidity.
- Mechanisms involving lung development, inflammation, and airway remodeling require further investigation.
- The long-term impact of early-life wheezing risk factors on asthma development needs to be determined.
Purpose Of Review:
There is increasing evidence that both prenatal and perinatal events influence both allergic diseases and early-life respiratory morbidity.
Recent Findings:
Studies in the last year have suggested that in-utero exposures including tobacco smoke exposure, dietary exposures including vitamin D, and prenatal infection and exposure to microbial products may modulate both atopy and respiratory disease. There have been studies revealing gene x environment interactions between inflammatory pathway genes and in-utero smoke exposure. There have also been studies which have revealed that prenatal exposure to endotoxin may be protective. On the other hand, a recent study also suggested that chorioamnionitis may increase the risk of recurrent wheezing in combination with preterm birth. Finally, two separate large cohort studies evaluated maternal diet in pregnancy and suggested that vitamin D levels may be protective against asthma and wheezing.
Summary:
There is epidemiological evidence for multiple prenatal factors impacting early-life respiratory morbidity. The mechanisms of these factors need further investigation and may act via various pathways which include effects on lung development, allergic and nonallergic inflammation, and airway remodeling. It remains to be determined if some of these early-life factors which predispose to wheezing will all translate into increased risk of asthma.
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